vendor dependencies, make some changes to how input is done

.gitignore

@@ -0,0 +1,2 @@
+tags
+whiteboard

keymap.go

@@ -1,35 +1,76 @@
 package main
 
-import "github.com/hajimehoshi/ebiten/v2"
+import (
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
 
 
-type keymap []ebiten.Key
+type keymap struct{
+	keys []ebiten.Key
+	mouseButtons []ebiten.MouseButton
+}
+
 var resize = keymap{
-    ebiten.KeyD,
+    keys: []ebiten.Key{ebiten.KeyD, ebiten.KeyK,},
-    ebiten.KeyK,
 }
 var drawBlack = keymap{
-    ebiten.KeyF,
+    keys: []ebiten.Key{ebiten.KeyF, ebiten.KeyJ,},
-    ebiten.KeyJ,
 }
 var drawWhite = keymap{
-    ebiten.KeyS,
+    keys: []ebiten.Key{ebiten.KeyS, ebiten.KeyL,},
-    ebiten.KeyL,
 }
 var undo = keymap{
-    ebiten.KeyZ,
+    keys: []ebiten.Key{ebiten.KeyZ, ebiten.KeyU,},
-    ebiten.KeyU,
 }
 var redo = keymap{
-    ebiten.KeyX,
+    keys: []ebiten.Key{ebiten.KeyX, ebiten.KeyR,},
-    ebiten.KeyR,
 }
 
-func (k keymap) check(checker func(ebiten.Key) bool) bool {
+func (k keymap) isJustPressed() bool {
-    for _, key := range k {
+	for _, key := range k.keys {
-        if checker(key) {
+		if inpututil.IsKeyJustPressed(key) {
-            return true
+			return true
-        }
+		}
-    }
+	}
-    return false
+
+	for _, mouseButton := range k.mouseButtons {
+		if inpututil.IsMouseButtonJustPressed(mouseButton) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (k keymap) isJustReleased() bool {
+	for _, key := range k.keys {
+		if inpututil.IsKeyJustReleased(key) {
+			return true
+		}
+	}
+
+	for _, mouseButton := range k.mouseButtons {
+		if inpututil.IsMouseButtonJustReleased(mouseButton) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (k keymap) isPressed() bool {
+	for _, key := range k.keys {
+		if ebiten.IsKeyPressed(key) {
+			return true
+		}
+	}
+
+	for _, mouseButton := range k.mouseButtons {
+		if ebiten.IsMouseButtonPressed(mouseButton) {
+			return true
+		}
+	}
+
+	return false
 }

main.go

@@ -6,7 +6,6 @@ import (
 	"math"
 
 	"github.com/hajimehoshi/ebiten/v2"
-	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"github.com/hajimehoshi/ebiten/v2/vector"
 )
 
@@ -56,17 +55,13 @@ func (a *app) Layout(_, _ int) (screenWidth int, screenHeight int) {
 
 func (a *app) Update() error {
 
-	check_any_drawing_input := func(checker func(ebiten.Key) bool) bool {
+	is_drawing := drawWhite.isPressed() || drawBlack.isPressed()
-		return drawWhite.check(checker) || drawBlack.check(checker)
+	just_started_drawing := drawWhite.isJustPressed() || drawBlack.isJustPressed()
-	}
-
-	is_drawing := check_any_drawing_input(ebiten.IsKeyPressed)
-	just_started_drawing := check_any_drawing_input(inpututil.IsKeyJustPressed)
 
 	var clr color.Color
-	if drawBlack.check(ebiten.IsKeyPressed) {
+	if drawBlack.isPressed() {
 		clr = color.Black
-	} else if drawWhite.check(ebiten.IsKeyPressed) {
+	} else if drawWhite.isPressed() {
 		clr = color.White
 	}
 
@@ -91,11 +86,11 @@ func (a *app) Update() error {
 		}
 	}
 
-	if resize.check(inpututil.IsKeyJustPressed) {
+	if resize.isJustPressed() {
 		a.sizeAnchorPos = cursorPosition()
 	}
 
-	if resize.check(ebiten.IsKeyPressed) {
+	if resize.isPressed() {
 		prevPos := a.sizeAnchorPos
 		currPos := cursorPosition()
 		reltivePos := Vec2{

vendor/github.com/ebitengine/gomobile/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2009 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/ebitengine/gomobile/PATENTS

@@ -0,0 +1,22 @@
+Additional IP Rights Grant (Patents)
+
+"This implementation" means the copyrightable works distributed by
+Google as part of the Go project.
+
+Google hereby grants to You a perpetual, worldwide, non-exclusive,
+no-charge, royalty-free, irrevocable (except as stated in this section)
+patent license to make, have made, use, offer to sell, sell, import,
+transfer and otherwise run, modify and propagate the contents of this
+implementation of Go, where such license applies only to those patent
+claims, both currently owned or controlled by Google and acquired in
+the future, licensable by Google that are necessarily infringed by this
+implementation of Go.  This grant does not include claims that would be
+infringed only as a consequence of further modification of this
+implementation.  If you or your agent or exclusive licensee institute or
+order or agree to the institution of patent litigation against any
+entity (including a cross-claim or counterclaim in a lawsuit) alleging
+that this implementation of Go or any code incorporated within this
+implementation of Go constitutes direct or contributory patent
+infringement, or inducement of patent infringement, then any patent
+rights granted to you under this License for this implementation of Go
+shall terminate as of the date such litigation is filed.

vendor/github.com/ebitengine/gomobile/app/GoNativeActivity.java

@@ -0,0 +1,67 @@
+package org.golang.app;
+
+import android.app.Activity;
+import android.app.NativeActivity;
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.KeyCharacterMap;
+
+public class GoNativeActivity extends NativeActivity {
+	private static GoNativeActivity goNativeActivity;
+
+	public GoNativeActivity() {
+		super();
+		goNativeActivity = this;
+	}
+
+	String getTmpdir() {
+		return getCacheDir().getAbsolutePath();
+	}
+
+	static int getRune(int deviceId, int keyCode, int metaState) {
+		try {
+			int rune = KeyCharacterMap.load(deviceId).get(keyCode, metaState);
+			if (rune == 0) {
+				return -1;
+			}
+			return rune;
+		} catch (KeyCharacterMap.UnavailableException e) {
+			return -1;
+		} catch (Exception e) {
+			Log.e("Go", "exception reading KeyCharacterMap", e);
+			return -1;
+		}
+	}
+
+	private void load() {
+		// Interestingly, NativeActivity uses a different method
+		// to find native code to execute, avoiding
+		// System.loadLibrary. The result is Java methods
+		// implemented in C with JNIEXPORT (and JNI_OnLoad) are not
+		// available unless an explicit call to System.loadLibrary
+		// is done. So we do it here, borrowing the name of the
+		// library from the same AndroidManifest.xml metadata used
+		// by NativeActivity.
+		try {
+			ActivityInfo ai = getPackageManager().getActivityInfo(
+					getIntent().getComponent(), PackageManager.GET_META_DATA);
+			if (ai.metaData == null) {
+				Log.e("Go", "loadLibrary: no manifest metadata found");
+				return;
+			}
+			String libName = ai.metaData.getString("android.app.lib_name");
+			System.loadLibrary(libName);
+		} catch (Exception e) {
+			Log.e("Go", "loadLibrary failed", e);
+		}
+	}
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		load();
+		super.onCreate(savedInstanceState);
+	}
+}

vendor/github.com/ebitengine/gomobile/app/android.c

@@ -0,0 +1,201 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build android
+// +build android
+
+#include <android/log.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <string.h>
+#include "_cgo_export.h"
+
+#define LOG_INFO(...) __android_log_print(ANDROID_LOG_INFO, "Go", __VA_ARGS__)
+#define LOG_FATAL(...) __android_log_print(ANDROID_LOG_FATAL, "Go", __VA_ARGS__)
+
+static jclass current_class;
+
+static jclass find_class(JNIEnv *env, const char *class_name) {
+	jclass clazz = (*env)->FindClass(env, class_name);
+	if (clazz == NULL) {
+		(*env)->ExceptionClear(env);
+		LOG_FATAL("cannot find %s", class_name);
+		return NULL;
+	}
+	return clazz;
+}
+
+static jmethodID find_method(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+	jmethodID m = (*env)->GetMethodID(env, clazz, name, sig);
+	if (m == 0) {
+		(*env)->ExceptionClear(env);
+		LOG_FATAL("cannot find method %s %s", name, sig);
+		return 0;
+	}
+	return m;
+}
+
+static jmethodID find_static_method(JNIEnv *env, jclass clazz, const char *name, const char *sig) {
+	jmethodID m = (*env)->GetStaticMethodID(env, clazz, name, sig);
+	if (m == 0) {
+		(*env)->ExceptionClear(env);
+		LOG_FATAL("cannot find method %s %s", name, sig);
+		return 0;
+	}
+	return m;
+}
+
+static jmethodID key_rune_method;
+
+jint JNI_OnLoad(JavaVM* vm, void* reserved) {
+	JNIEnv* env;
+	if ((*vm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_6) != JNI_OK) {
+		return -1;
+	}
+
+	return JNI_VERSION_1_6;
+}
+
+static int main_running = 0;
+
+// Entry point from our subclassed NativeActivity.
+//
+// By here, the Go runtime has been initialized (as we are running in
+// -buildmode=c-shared) but the first time it is called, Go's main.main
+// hasn't been called yet.
+//
+// The Activity may be created and destroyed multiple times throughout
+// the life of a single process. Each time, onCreate is called.
+void ANativeActivity_onCreate(ANativeActivity *activity, void* savedState, size_t savedStateSize) {
+	if (!main_running) {
+		JNIEnv* env = activity->env;
+
+		// Note that activity->clazz is mis-named.
+		current_class = (*env)->GetObjectClass(env, activity->clazz);
+		current_class = (*env)->NewGlobalRef(env, current_class);
+		key_rune_method = find_static_method(env, current_class, "getRune", "(III)I");
+
+		setCurrentContext(activity->vm, (*env)->NewGlobalRef(env, activity->clazz));
+
+		// Set TMPDIR.
+		jmethodID gettmpdir = find_method(env, current_class, "getTmpdir", "()Ljava/lang/String;");
+		jstring jpath = (jstring)(*env)->CallObjectMethod(env, activity->clazz, gettmpdir, NULL);
+		const char* tmpdir = (*env)->GetStringUTFChars(env, jpath, NULL);
+		if (setenv("TMPDIR", tmpdir, 1) != 0) {
+			LOG_INFO("setenv(\"TMPDIR\", \"%s\", 1) failed: %d", tmpdir, errno);
+		}
+		(*env)->ReleaseStringUTFChars(env, jpath, tmpdir);
+
+		// Call the Go main.main.
+		uintptr_t mainPC = (uintptr_t)dlsym(RTLD_DEFAULT, "main.main");
+		if (!mainPC) {
+			LOG_FATAL("missing main.main");
+		}
+		callMain(mainPC);
+		main_running = 1;
+	}
+
+	// These functions match the methods on Activity, described at
+	// http://developer.android.com/reference/android/app/Activity.html
+	//
+	// Note that onNativeWindowResized is not called on resize. Avoid it.
+	// https://code.google.com/p/android/issues/detail?id=180645
+	activity->callbacks->onStart = onStart;
+	activity->callbacks->onResume = onResume;
+	activity->callbacks->onSaveInstanceState = onSaveInstanceState;
+	activity->callbacks->onPause = onPause;
+	activity->callbacks->onStop = onStop;
+	activity->callbacks->onDestroy = onDestroy;
+	activity->callbacks->onWindowFocusChanged = onWindowFocusChanged;
+	activity->callbacks->onNativeWindowCreated = onNativeWindowCreated;
+	activity->callbacks->onNativeWindowRedrawNeeded = onNativeWindowRedrawNeeded;
+	activity->callbacks->onNativeWindowDestroyed = onNativeWindowDestroyed;
+	activity->callbacks->onInputQueueCreated = onInputQueueCreated;
+	activity->callbacks->onInputQueueDestroyed = onInputQueueDestroyed;
+	activity->callbacks->onConfigurationChanged = onConfigurationChanged;
+	activity->callbacks->onLowMemory = onLowMemory;
+
+	onCreate(activity);
+}
+
+// TODO(crawshaw): Test configuration on more devices.
+static const EGLint RGB_888[] = {
+	EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+	EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+	EGL_BLUE_SIZE, 8,
+	EGL_GREEN_SIZE, 8,
+	EGL_RED_SIZE, 8,
+	EGL_DEPTH_SIZE, 16,
+	EGL_CONFIG_CAVEAT, EGL_NONE,
+	EGL_NONE
+};
+
+EGLDisplay display = NULL;
+EGLSurface surface = NULL;
+
+static char* initEGLDisplay() {
+	display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+	if (!eglInitialize(display, 0, 0)) {
+		return "EGL initialize failed";
+	}
+	return NULL;
+}
+
+char* createEGLSurface(ANativeWindow* window) {
+	char* err;
+	EGLint numConfigs, format;
+	EGLConfig config;
+	EGLContext context;
+
+	if (display == 0) {
+		if ((err = initEGLDisplay()) != NULL) {
+			return err;
+		}
+	}
+
+	if (!eglChooseConfig(display, RGB_888, &config, 1, &numConfigs)) {
+		return "EGL choose RGB_888 config failed";
+	}
+	if (numConfigs <= 0) {
+		return "EGL no config found";
+	}
+
+	eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &format);
+	if (ANativeWindow_setBuffersGeometry(window, 0, 0, format) != 0) {
+		return "EGL set buffers geometry failed";
+	}
+
+	surface = eglCreateWindowSurface(display, config, window, NULL);
+	if (surface == EGL_NO_SURFACE) {
+		return "EGL create surface failed";
+	}
+
+	const EGLint contextAttribs[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE };
+	context = eglCreateContext(display, config, EGL_NO_CONTEXT, contextAttribs);
+
+	if (eglMakeCurrent(display, surface, surface, context) == EGL_FALSE) {
+		return "eglMakeCurrent failed";
+	}
+	return NULL;
+}
+
+char* destroyEGLSurface() {
+	if (!eglDestroySurface(display, surface)) {
+		return "EGL destroy surface failed";
+	}
+	return NULL;
+}
+
+int32_t getKeyRune(JNIEnv* env, AInputEvent* e) {
+	return (int32_t)(*env)->CallStaticIntMethod(
+		env,
+		current_class,
+		key_rune_method,
+		AInputEvent_getDeviceId(e),
+		AKeyEvent_getKeyCode(e),
+		AKeyEvent_getMetaState(e)
+	);
+}

vendor/github.com/ebitengine/gomobile/app/android.go

@@ -0,0 +1,824 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build android
+
+/*
+Android Apps are built with -buildmode=c-shared. They are loaded by a
+running Java process.
+
+Before any entry point is reached, a global constructor initializes the
+Go runtime, calling all Go init functions. All cgo calls will block
+until this is complete. Next JNI_OnLoad is called. When that is
+complete, one of two entry points is called.
+
+All-Go apps built using NativeActivity enter at ANativeActivity_onCreate.
+
+Go libraries (for example, those built with gomobile bind) do not use
+the app package initialization.
+*/
+
+package app
+
+/*
+#cgo LDFLAGS: -landroid -llog -lEGL -lGLESv2
+
+#include <android/configuration.h>
+#include <android/input.h>
+#include <android/keycodes.h>
+#include <android/looper.h>
+#include <android/native_activity.h>
+#include <android/native_window.h>
+#include <EGL/egl.h>
+#include <jni.h>
+#include <pthread.h>
+#include <stdlib.h>
+
+extern EGLDisplay display;
+extern EGLSurface surface;
+
+
+char* createEGLSurface(ANativeWindow* window);
+char* destroyEGLSurface();
+int32_t getKeyRune(JNIEnv* env, AInputEvent* e);
+*/
+import "C"
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+	"unsafe"
+
+	"github.com/ebitengine/gomobile/app/internal/callfn"
+	"github.com/ebitengine/gomobile/event/key"
+	"github.com/ebitengine/gomobile/event/lifecycle"
+	"github.com/ebitengine/gomobile/event/paint"
+	"github.com/ebitengine/gomobile/event/size"
+	"github.com/ebitengine/gomobile/event/touch"
+	"github.com/ebitengine/gomobile/geom"
+	"github.com/ebitengine/gomobile/internal/mobileinit"
+)
+
+// RunOnJVM runs fn on a new goroutine locked to an OS thread with a JNIEnv.
+//
+// RunOnJVM blocks until the call to fn is complete. Any Java
+// exception or failure to attach to the JVM is returned as an error.
+//
+// The function fn takes vm, the current JavaVM*,
+// env, the current JNIEnv*, and
+// ctx, a jobject representing the global android.context.Context.
+func RunOnJVM(fn func(vm, jniEnv, ctx uintptr) error) error {
+	return mobileinit.RunOnJVM(fn)
+}
+
+//export setCurrentContext
+func setCurrentContext(vm *C.JavaVM, ctx C.jobject) {
+	mobileinit.SetCurrentContext(unsafe.Pointer(vm), uintptr(ctx))
+}
+
+//export callMain
+func callMain(mainPC uintptr) {
+	for _, name := range []string{"TMPDIR", "PATH", "LD_LIBRARY_PATH"} {
+		n := C.CString(name)
+		os.Setenv(name, C.GoString(C.getenv(n)))
+		C.free(unsafe.Pointer(n))
+	}
+
+	// Set timezone.
+	//
+	// Note that Android zoneinfo is stored in /system/usr/share/zoneinfo,
+	// but it is in some kind of packed TZiff file that we do not support
+	// yet. As a stopgap, we build a fixed zone using the tm_zone name.
+	var curtime C.time_t
+	var curtm C.struct_tm
+	C.time(&curtime)
+	C.localtime_r(&curtime, &curtm)
+	tzOffset := int(curtm.tm_gmtoff)
+	tz := C.GoString(curtm.tm_zone)
+	time.Local = time.FixedZone(tz, tzOffset)
+
+	go callfn.CallFn(mainPC)
+}
+
+//export onStart
+func onStart(activity *C.ANativeActivity) {
+}
+
+//export onResume
+func onResume(activity *C.ANativeActivity) {
+}
+
+//export onSaveInstanceState
+func onSaveInstanceState(activity *C.ANativeActivity, outSize *C.size_t) unsafe.Pointer {
+	return nil
+}
+
+//export onPause
+func onPause(activity *C.ANativeActivity) {
+}
+
+//export onStop
+func onStop(activity *C.ANativeActivity) {
+}
+
+//export onCreate
+func onCreate(activity *C.ANativeActivity) {
+	// Set the initial configuration.
+	//
+	// Note we use unbuffered channels to talk to the activity loop, and
+	// NativeActivity calls these callbacks sequentially, so configuration
+	// will be set before <-windowRedrawNeeded is processed.
+	windowConfigChange <- windowConfigRead(activity)
+}
+
+//export onDestroy
+func onDestroy(activity *C.ANativeActivity) {
+}
+
+//export onWindowFocusChanged
+func onWindowFocusChanged(activity *C.ANativeActivity, hasFocus C.int) {
+}
+
+//export onNativeWindowCreated
+func onNativeWindowCreated(activity *C.ANativeActivity, window *C.ANativeWindow) {
+}
+
+//export onNativeWindowRedrawNeeded
+func onNativeWindowRedrawNeeded(activity *C.ANativeActivity, window *C.ANativeWindow) {
+	// Called on orientation change and window resize.
+	// Send a request for redraw, and block this function
+	// until a complete draw and buffer swap is completed.
+	// This is required by the redraw documentation to
+	// avoid bad draws.
+	windowRedrawNeeded <- window
+	<-windowRedrawDone
+}
+
+//export onNativeWindowDestroyed
+func onNativeWindowDestroyed(activity *C.ANativeActivity, window *C.ANativeWindow) {
+	windowDestroyed <- window
+}
+
+//export onInputQueueCreated
+func onInputQueueCreated(activity *C.ANativeActivity, q *C.AInputQueue) {
+	inputQueue <- q
+	<-inputQueueDone
+}
+
+//export onInputQueueDestroyed
+func onInputQueueDestroyed(activity *C.ANativeActivity, q *C.AInputQueue) {
+	inputQueue <- nil
+	<-inputQueueDone
+}
+
+//export onContentRectChanged
+func onContentRectChanged(activity *C.ANativeActivity, rect *C.ARect) {
+}
+
+type windowConfig struct {
+	orientation size.Orientation
+	pixelsPerPt float32
+}
+
+func windowConfigRead(activity *C.ANativeActivity) windowConfig {
+	aconfig := C.AConfiguration_new()
+	C.AConfiguration_fromAssetManager(aconfig, activity.assetManager)
+	orient := C.AConfiguration_getOrientation(aconfig)
+	density := C.AConfiguration_getDensity(aconfig)
+	C.AConfiguration_delete(aconfig)
+
+	// Calculate the screen resolution. This value is approximate. For example,
+	// a physical resolution of 200 DPI may be quantized to one of the
+	// ACONFIGURATION_DENSITY_XXX values such as 160 or 240.
+	//
+	// A more accurate DPI could possibly be calculated from
+	// https://developer.android.com/reference/android/util/DisplayMetrics.html#xdpi
+	// but this does not appear to be accessible via the NDK. In any case, the
+	// hardware might not even provide a more accurate number, as the system
+	// does not apparently use the reported value. See golang.org/issue/13366
+	// for a discussion.
+	var dpi int
+	switch density {
+	case C.ACONFIGURATION_DENSITY_DEFAULT:
+		dpi = 160
+	case C.ACONFIGURATION_DENSITY_LOW,
+		C.ACONFIGURATION_DENSITY_MEDIUM,
+		213, // C.ACONFIGURATION_DENSITY_TV
+		C.ACONFIGURATION_DENSITY_HIGH,
+		320, // ACONFIGURATION_DENSITY_XHIGH
+		480, // ACONFIGURATION_DENSITY_XXHIGH
+		640: // ACONFIGURATION_DENSITY_XXXHIGH
+		dpi = int(density)
+	case C.ACONFIGURATION_DENSITY_NONE:
+		log.Print("android device reports no screen density")
+		dpi = 72
+	default:
+		log.Printf("android device reports unknown density: %d", density)
+		// All we can do is guess.
+		if density > 0 {
+			dpi = int(density)
+		} else {
+			dpi = 72
+		}
+	}
+
+	o := size.OrientationUnknown
+	switch orient {
+	case C.ACONFIGURATION_ORIENTATION_PORT:
+		o = size.OrientationPortrait
+	case C.ACONFIGURATION_ORIENTATION_LAND:
+		o = size.OrientationLandscape
+	}
+
+	return windowConfig{
+		orientation: o,
+		pixelsPerPt: float32(dpi) / 72,
+	}
+}
+
+//export onConfigurationChanged
+func onConfigurationChanged(activity *C.ANativeActivity) {
+	// A rotation event first triggers onConfigurationChanged, then
+	// calls onNativeWindowRedrawNeeded. We extract the orientation
+	// here and save it for the redraw event.
+	windowConfigChange <- windowConfigRead(activity)
+}
+
+//export onLowMemory
+func onLowMemory(activity *C.ANativeActivity) {
+}
+
+var (
+	inputQueue         = make(chan *C.AInputQueue)
+	inputQueueDone     = make(chan struct{})
+	windowDestroyed    = make(chan *C.ANativeWindow)
+	windowRedrawNeeded = make(chan *C.ANativeWindow)
+	windowRedrawDone   = make(chan struct{})
+	windowConfigChange = make(chan windowConfig)
+)
+
+func init() {
+	theApp.registerGLViewportFilter()
+}
+
+func main(f func(App)) {
+	mainUserFn = f
+	// TODO: merge the runInputQueue and mainUI functions?
+	go func() {
+		if err := mobileinit.RunOnJVM(runInputQueue); err != nil {
+			log.Fatalf("app: %v", err)
+		}
+	}()
+	// Preserve this OS thread for:
+	//	1. the attached JNI thread
+	//	2. the GL context
+	if err := mobileinit.RunOnJVM(mainUI); err != nil {
+		log.Fatalf("app: %v", err)
+	}
+}
+
+var mainUserFn func(App)
+
+func mainUI(vm, jniEnv, ctx uintptr) error {
+	workAvailable := theApp.worker.WorkAvailable()
+
+	donec := make(chan struct{})
+	go func() {
+		// close the donec channel in a defer statement
+		// so that we could still be able to return even
+		// if mainUserFn panics.
+		defer close(donec)
+
+		mainUserFn(theApp)
+	}()
+
+	var pixelsPerPt float32
+	var orientation size.Orientation
+
+	for {
+		select {
+		case <-donec:
+			return nil
+		case cfg := <-windowConfigChange:
+			pixelsPerPt = cfg.pixelsPerPt
+			orientation = cfg.orientation
+		case w := <-windowRedrawNeeded:
+			if C.surface == nil {
+				if errStr := C.createEGLSurface(w); errStr != nil {
+					return fmt.Errorf("%s (%s)", C.GoString(errStr), eglGetError())
+				}
+			}
+			theApp.sendLifecycle(lifecycle.StageFocused)
+			widthPx := int(C.ANativeWindow_getWidth(w))
+			heightPx := int(C.ANativeWindow_getHeight(w))
+			theApp.eventsIn <- size.Event{
+				WidthPx:     widthPx,
+				HeightPx:    heightPx,
+				WidthPt:     geom.Pt(float32(widthPx) / pixelsPerPt),
+				HeightPt:    geom.Pt(float32(heightPx) / pixelsPerPt),
+				PixelsPerPt: pixelsPerPt,
+				Orientation: orientation,
+			}
+			theApp.eventsIn <- paint.Event{External: true}
+		case <-windowDestroyed:
+			if C.surface != nil {
+				if errStr := C.destroyEGLSurface(); errStr != nil {
+					return fmt.Errorf("%s (%s)", C.GoString(errStr), eglGetError())
+				}
+			}
+			C.surface = nil
+			theApp.sendLifecycle(lifecycle.StageAlive)
+		case <-workAvailable:
+			theApp.worker.DoWork()
+		case <-theApp.publish:
+			// TODO: compare a generation number to redrawGen for stale paints?
+			if C.surface != nil {
+				// eglSwapBuffers blocks until vsync.
+				if C.eglSwapBuffers(C.display, C.surface) == C.EGL_FALSE {
+					log.Printf("app: failed to swap buffers (%s)", eglGetError())
+				}
+			}
+			select {
+			case windowRedrawDone <- struct{}{}:
+			default:
+			}
+			theApp.publishResult <- PublishResult{}
+		}
+	}
+}
+
+func runInputQueue(vm, jniEnv, ctx uintptr) error {
+	env := (*C.JNIEnv)(unsafe.Pointer(jniEnv)) // not a Go heap pointer
+
+	// Android loopers select on OS file descriptors, not Go channels, so we
+	// translate the inputQueue channel to an ALooper_wake call.
+	l := C.ALooper_prepare(C.ALOOPER_PREPARE_ALLOW_NON_CALLBACKS)
+	pending := make(chan *C.AInputQueue, 1)
+	go func() {
+		for q := range inputQueue {
+			pending <- q
+			C.ALooper_wake(l)
+		}
+	}()
+
+	var q *C.AInputQueue
+	for {
+		if C.ALooper_pollOnce(-1, nil, nil, nil) == C.ALOOPER_POLL_WAKE {
+			select {
+			default:
+			case p := <-pending:
+				if q != nil {
+					processEvents(env, q)
+					C.AInputQueue_detachLooper(q)
+				}
+				q = p
+				if q != nil {
+					C.AInputQueue_attachLooper(q, l, 0, nil, nil)
+				}
+				inputQueueDone <- struct{}{}
+			}
+		}
+		if q != nil {
+			processEvents(env, q)
+		}
+	}
+}
+
+func processEvents(env *C.JNIEnv, q *C.AInputQueue) {
+	var e *C.AInputEvent
+	for C.AInputQueue_getEvent(q, &e) >= 0 {
+		if C.AInputQueue_preDispatchEvent(q, e) != 0 {
+			continue
+		}
+		processEvent(env, e)
+		C.AInputQueue_finishEvent(q, e, 0)
+	}
+}
+
+func processEvent(env *C.JNIEnv, e *C.AInputEvent) {
+	switch C.AInputEvent_getType(e) {
+	case C.AINPUT_EVENT_TYPE_KEY:
+		processKey(env, e)
+	case C.AINPUT_EVENT_TYPE_MOTION:
+		// At most one of the events in this batch is an up or down event; get its index and change.
+		upDownIndex := C.size_t(C.AMotionEvent_getAction(e)&C.AMOTION_EVENT_ACTION_POINTER_INDEX_MASK) >> C.AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT
+		upDownType := touch.TypeMove
+		switch C.AMotionEvent_getAction(e) & C.AMOTION_EVENT_ACTION_MASK {
+		case C.AMOTION_EVENT_ACTION_DOWN, C.AMOTION_EVENT_ACTION_POINTER_DOWN:
+			upDownType = touch.TypeBegin
+		case C.AMOTION_EVENT_ACTION_UP, C.AMOTION_EVENT_ACTION_POINTER_UP:
+			upDownType = touch.TypeEnd
+		}
+
+		for i, n := C.size_t(0), C.AMotionEvent_getPointerCount(e); i < n; i++ {
+			t := touch.TypeMove
+			if i == upDownIndex {
+				t = upDownType
+			}
+			theApp.eventsIn <- touch.Event{
+				X:        float32(C.AMotionEvent_getX(e, i)),
+				Y:        float32(C.AMotionEvent_getY(e, i)),
+				Sequence: touch.Sequence(C.AMotionEvent_getPointerId(e, i)),
+				Type:     t,
+			}
+		}
+	default:
+		log.Printf("unknown input event, type=%d", C.AInputEvent_getType(e))
+	}
+}
+
+func processKey(env *C.JNIEnv, e *C.AInputEvent) {
+	deviceID := C.AInputEvent_getDeviceId(e)
+	if deviceID == 0 {
+		// Software keyboard input, leaving for scribe/IME.
+		return
+	}
+
+	k := key.Event{
+		Rune: rune(C.getKeyRune(env, e)),
+		Code: convAndroidKeyCode(int32(C.AKeyEvent_getKeyCode(e))),
+	}
+	switch C.AKeyEvent_getAction(e) {
+	case C.AKEY_EVENT_ACTION_DOWN:
+		k.Direction = key.DirPress
+	case C.AKEY_EVENT_ACTION_UP:
+		k.Direction = key.DirRelease
+	default:
+		k.Direction = key.DirNone
+	}
+	// TODO(crawshaw): set Modifiers.
+	theApp.eventsIn <- k
+}
+
+func eglGetError() string {
+	switch errNum := C.eglGetError(); errNum {
+	case C.EGL_SUCCESS:
+		return "EGL_SUCCESS"
+	case C.EGL_NOT_INITIALIZED:
+		return "EGL_NOT_INITIALIZED"
+	case C.EGL_BAD_ACCESS:
+		return "EGL_BAD_ACCESS"
+	case C.EGL_BAD_ALLOC:
+		return "EGL_BAD_ALLOC"
+	case C.EGL_BAD_ATTRIBUTE:
+		return "EGL_BAD_ATTRIBUTE"
+	case C.EGL_BAD_CONTEXT:
+		return "EGL_BAD_CONTEXT"
+	case C.EGL_BAD_CONFIG:
+		return "EGL_BAD_CONFIG"
+	case C.EGL_BAD_CURRENT_SURFACE:
+		return "EGL_BAD_CURRENT_SURFACE"
+	case C.EGL_BAD_DISPLAY:
+		return "EGL_BAD_DISPLAY"
+	case C.EGL_BAD_SURFACE:
+		return "EGL_BAD_SURFACE"
+	case C.EGL_BAD_MATCH:
+		return "EGL_BAD_MATCH"
+	case C.EGL_BAD_PARAMETER:
+		return "EGL_BAD_PARAMETER"
+	case C.EGL_BAD_NATIVE_PIXMAP:
+		return "EGL_BAD_NATIVE_PIXMAP"
+	case C.EGL_BAD_NATIVE_WINDOW:
+		return "EGL_BAD_NATIVE_WINDOW"
+	case C.EGL_CONTEXT_LOST:
+		return "EGL_CONTEXT_LOST"
+	default:
+		return fmt.Sprintf("Unknown EGL err: %d", errNum)
+	}
+}
+
+func convAndroidKeyCode(aKeyCode int32) key.Code {
+	// Many Android key codes do not map into USB HID codes.
+	// For those, key.CodeUnknown is returned. This switch has all
+	// cases, even the unknown ones, to serve as a documentation
+	// and search aid.
+	switch aKeyCode {
+	case C.AKEYCODE_UNKNOWN:
+	case C.AKEYCODE_SOFT_LEFT:
+	case C.AKEYCODE_SOFT_RIGHT:
+	case C.AKEYCODE_HOME:
+		return key.CodeHome
+	case C.AKEYCODE_BACK:
+	case C.AKEYCODE_CALL:
+	case C.AKEYCODE_ENDCALL:
+	case C.AKEYCODE_0:
+		return key.Code0
+	case C.AKEYCODE_1:
+		return key.Code1
+	case C.AKEYCODE_2:
+		return key.Code2
+	case C.AKEYCODE_3:
+		return key.Code3
+	case C.AKEYCODE_4:
+		return key.Code4
+	case C.AKEYCODE_5:
+		return key.Code5
+	case C.AKEYCODE_6:
+		return key.Code6
+	case C.AKEYCODE_7:
+		return key.Code7
+	case C.AKEYCODE_8:
+		return key.Code8
+	case C.AKEYCODE_9:
+		return key.Code9
+	case C.AKEYCODE_STAR:
+	case C.AKEYCODE_POUND:
+	case C.AKEYCODE_DPAD_UP:
+	case C.AKEYCODE_DPAD_DOWN:
+	case C.AKEYCODE_DPAD_LEFT:
+	case C.AKEYCODE_DPAD_RIGHT:
+	case C.AKEYCODE_DPAD_CENTER:
+	case C.AKEYCODE_VOLUME_UP:
+		return key.CodeVolumeUp
+	case C.AKEYCODE_VOLUME_DOWN:
+		return key.CodeVolumeDown
+	case C.AKEYCODE_POWER:
+	case C.AKEYCODE_CAMERA:
+	case C.AKEYCODE_CLEAR:
+	case C.AKEYCODE_A:
+		return key.CodeA
+	case C.AKEYCODE_B:
+		return key.CodeB
+	case C.AKEYCODE_C:
+		return key.CodeC
+	case C.AKEYCODE_D:
+		return key.CodeD
+	case C.AKEYCODE_E:
+		return key.CodeE
+	case C.AKEYCODE_F:
+		return key.CodeF
+	case C.AKEYCODE_G:
+		return key.CodeG
+	case C.AKEYCODE_H:
+		return key.CodeH
+	case C.AKEYCODE_I:
+		return key.CodeI
+	case C.AKEYCODE_J:
+		return key.CodeJ
+	case C.AKEYCODE_K:
+		return key.CodeK
+	case C.AKEYCODE_L:
+		return key.CodeL
+	case C.AKEYCODE_M:
+		return key.CodeM
+	case C.AKEYCODE_N:
+		return key.CodeN
+	case C.AKEYCODE_O:
+		return key.CodeO
+	case C.AKEYCODE_P:
+		return key.CodeP
+	case C.AKEYCODE_Q:
+		return key.CodeQ
+	case C.AKEYCODE_R:
+		return key.CodeR
+	case C.AKEYCODE_S:
+		return key.CodeS
+	case C.AKEYCODE_T:
+		return key.CodeT
+	case C.AKEYCODE_U:
+		return key.CodeU
+	case C.AKEYCODE_V:
+		return key.CodeV
+	case C.AKEYCODE_W:
+		return key.CodeW
+	case C.AKEYCODE_X:
+		return key.CodeX
+	case C.AKEYCODE_Y:
+		return key.CodeY
+	case C.AKEYCODE_Z:
+		return key.CodeZ
+	case C.AKEYCODE_COMMA:
+		return key.CodeComma
+	case C.AKEYCODE_PERIOD:
+		return key.CodeFullStop
+	case C.AKEYCODE_ALT_LEFT:
+		return key.CodeLeftAlt
+	case C.AKEYCODE_ALT_RIGHT:
+		return key.CodeRightAlt
+	case C.AKEYCODE_SHIFT_LEFT:
+		return key.CodeLeftShift
+	case C.AKEYCODE_SHIFT_RIGHT:
+		return key.CodeRightShift
+	case C.AKEYCODE_TAB:
+		return key.CodeTab
+	case C.AKEYCODE_SPACE:
+		return key.CodeSpacebar
+	case C.AKEYCODE_SYM:
+	case C.AKEYCODE_EXPLORER:
+	case C.AKEYCODE_ENVELOPE:
+	case C.AKEYCODE_ENTER:
+		return key.CodeReturnEnter
+	case C.AKEYCODE_DEL:
+		return key.CodeDeleteBackspace
+	case C.AKEYCODE_GRAVE:
+		return key.CodeGraveAccent
+	case C.AKEYCODE_MINUS:
+		return key.CodeHyphenMinus
+	case C.AKEYCODE_EQUALS:
+		return key.CodeEqualSign
+	case C.AKEYCODE_LEFT_BRACKET:
+		return key.CodeLeftSquareBracket
+	case C.AKEYCODE_RIGHT_BRACKET:
+		return key.CodeRightSquareBracket
+	case C.AKEYCODE_BACKSLASH:
+		return key.CodeBackslash
+	case C.AKEYCODE_SEMICOLON:
+		return key.CodeSemicolon
+	case C.AKEYCODE_APOSTROPHE:
+		return key.CodeApostrophe
+	case C.AKEYCODE_SLASH:
+		return key.CodeSlash
+	case C.AKEYCODE_AT:
+	case C.AKEYCODE_NUM:
+	case C.AKEYCODE_HEADSETHOOK:
+	case C.AKEYCODE_FOCUS:
+	case C.AKEYCODE_PLUS:
+	case C.AKEYCODE_MENU:
+	case C.AKEYCODE_NOTIFICATION:
+	case C.AKEYCODE_SEARCH:
+	case C.AKEYCODE_MEDIA_PLAY_PAUSE:
+	case C.AKEYCODE_MEDIA_STOP:
+	case C.AKEYCODE_MEDIA_NEXT:
+	case C.AKEYCODE_MEDIA_PREVIOUS:
+	case C.AKEYCODE_MEDIA_REWIND:
+	case C.AKEYCODE_MEDIA_FAST_FORWARD:
+	case C.AKEYCODE_MUTE:
+	case C.AKEYCODE_PAGE_UP:
+		return key.CodePageUp
+	case C.AKEYCODE_PAGE_DOWN:
+		return key.CodePageDown
+	case C.AKEYCODE_PICTSYMBOLS:
+	case C.AKEYCODE_SWITCH_CHARSET:
+	case C.AKEYCODE_BUTTON_A:
+	case C.AKEYCODE_BUTTON_B:
+	case C.AKEYCODE_BUTTON_C:
+	case C.AKEYCODE_BUTTON_X:
+	case C.AKEYCODE_BUTTON_Y:
+	case C.AKEYCODE_BUTTON_Z:
+	case C.AKEYCODE_BUTTON_L1:
+	case C.AKEYCODE_BUTTON_R1:
+	case C.AKEYCODE_BUTTON_L2:
+	case C.AKEYCODE_BUTTON_R2:
+	case C.AKEYCODE_BUTTON_THUMBL:
+	case C.AKEYCODE_BUTTON_THUMBR:
+	case C.AKEYCODE_BUTTON_START:
+	case C.AKEYCODE_BUTTON_SELECT:
+	case C.AKEYCODE_BUTTON_MODE:
+	case C.AKEYCODE_ESCAPE:
+		return key.CodeEscape
+	case C.AKEYCODE_FORWARD_DEL:
+		return key.CodeDeleteForward
+	case C.AKEYCODE_CTRL_LEFT:
+		return key.CodeLeftControl
+	case C.AKEYCODE_CTRL_RIGHT:
+		return key.CodeRightControl
+	case C.AKEYCODE_CAPS_LOCK:
+		return key.CodeCapsLock
+	case C.AKEYCODE_SCROLL_LOCK:
+	case C.AKEYCODE_META_LEFT:
+		return key.CodeLeftGUI
+	case C.AKEYCODE_META_RIGHT:
+		return key.CodeRightGUI
+	case C.AKEYCODE_FUNCTION:
+	case C.AKEYCODE_SYSRQ:
+	case C.AKEYCODE_BREAK:
+	case C.AKEYCODE_MOVE_HOME:
+	case C.AKEYCODE_MOVE_END:
+	case C.AKEYCODE_INSERT:
+		return key.CodeInsert
+	case C.AKEYCODE_FORWARD:
+	case C.AKEYCODE_MEDIA_PLAY:
+	case C.AKEYCODE_MEDIA_PAUSE:
+	case C.AKEYCODE_MEDIA_CLOSE:
+	case C.AKEYCODE_MEDIA_EJECT:
+	case C.AKEYCODE_MEDIA_RECORD:
+	case C.AKEYCODE_F1:
+		return key.CodeF1
+	case C.AKEYCODE_F2:
+		return key.CodeF2
+	case C.AKEYCODE_F3:
+		return key.CodeF3
+	case C.AKEYCODE_F4:
+		return key.CodeF4
+	case C.AKEYCODE_F5:
+		return key.CodeF5
+	case C.AKEYCODE_F6:
+		return key.CodeF6
+	case C.AKEYCODE_F7:
+		return key.CodeF7
+	case C.AKEYCODE_F8:
+		return key.CodeF8
+	case C.AKEYCODE_F9:
+		return key.CodeF9
+	case C.AKEYCODE_F10:
+		return key.CodeF10
+	case C.AKEYCODE_F11:
+		return key.CodeF11
+	case C.AKEYCODE_F12:
+		return key.CodeF12
+	case C.AKEYCODE_NUM_LOCK:
+		return key.CodeKeypadNumLock
+	case C.AKEYCODE_NUMPAD_0:
+		return key.CodeKeypad0
+	case C.AKEYCODE_NUMPAD_1:
+		return key.CodeKeypad1
+	case C.AKEYCODE_NUMPAD_2:
+		return key.CodeKeypad2
+	case C.AKEYCODE_NUMPAD_3:
+		return key.CodeKeypad3
+	case C.AKEYCODE_NUMPAD_4:
+		return key.CodeKeypad4
+	case C.AKEYCODE_NUMPAD_5:
+		return key.CodeKeypad5
+	case C.AKEYCODE_NUMPAD_6:
+		return key.CodeKeypad6
+	case C.AKEYCODE_NUMPAD_7:
+		return key.CodeKeypad7
+	case C.AKEYCODE_NUMPAD_8:
+		return key.CodeKeypad8
+	case C.AKEYCODE_NUMPAD_9:
+		return key.CodeKeypad9
+	case C.AKEYCODE_NUMPAD_DIVIDE:
+		return key.CodeKeypadSlash
+	case C.AKEYCODE_NUMPAD_MULTIPLY:
+		return key.CodeKeypadAsterisk
+	case C.AKEYCODE_NUMPAD_SUBTRACT:
+		return key.CodeKeypadHyphenMinus
+	case C.AKEYCODE_NUMPAD_ADD:
+		return key.CodeKeypadPlusSign
+	case C.AKEYCODE_NUMPAD_DOT:
+		return key.CodeKeypadFullStop
+	case C.AKEYCODE_NUMPAD_COMMA:
+	case C.AKEYCODE_NUMPAD_ENTER:
+		return key.CodeKeypadEnter
+	case C.AKEYCODE_NUMPAD_EQUALS:
+		return key.CodeKeypadEqualSign
+	case C.AKEYCODE_NUMPAD_LEFT_PAREN:
+	case C.AKEYCODE_NUMPAD_RIGHT_PAREN:
+	case C.AKEYCODE_VOLUME_MUTE:
+		return key.CodeMute
+	case C.AKEYCODE_INFO:
+	case C.AKEYCODE_CHANNEL_UP:
+	case C.AKEYCODE_CHANNEL_DOWN:
+	case C.AKEYCODE_ZOOM_IN:
+	case C.AKEYCODE_ZOOM_OUT:
+	case C.AKEYCODE_TV:
+	case C.AKEYCODE_WINDOW:
+	case C.AKEYCODE_GUIDE:
+	case C.AKEYCODE_DVR:
+	case C.AKEYCODE_BOOKMARK:
+	case C.AKEYCODE_CAPTIONS:
+	case C.AKEYCODE_SETTINGS:
+	case C.AKEYCODE_TV_POWER:
+	case C.AKEYCODE_TV_INPUT:
+	case C.AKEYCODE_STB_POWER:
+	case C.AKEYCODE_STB_INPUT:
+	case C.AKEYCODE_AVR_POWER:
+	case C.AKEYCODE_AVR_INPUT:
+	case C.AKEYCODE_PROG_RED:
+	case C.AKEYCODE_PROG_GREEN:
+	case C.AKEYCODE_PROG_YELLOW:
+	case C.AKEYCODE_PROG_BLUE:
+	case C.AKEYCODE_APP_SWITCH:
+	case C.AKEYCODE_BUTTON_1:
+	case C.AKEYCODE_BUTTON_2:
+	case C.AKEYCODE_BUTTON_3:
+	case C.AKEYCODE_BUTTON_4:
+	case C.AKEYCODE_BUTTON_5:
+	case C.AKEYCODE_BUTTON_6:
+	case C.AKEYCODE_BUTTON_7:
+	case C.AKEYCODE_BUTTON_8:
+	case C.AKEYCODE_BUTTON_9:
+	case C.AKEYCODE_BUTTON_10:
+	case C.AKEYCODE_BUTTON_11:
+	case C.AKEYCODE_BUTTON_12:
+	case C.AKEYCODE_BUTTON_13:
+	case C.AKEYCODE_BUTTON_14:
+	case C.AKEYCODE_BUTTON_15:
+	case C.AKEYCODE_BUTTON_16:
+	case C.AKEYCODE_LANGUAGE_SWITCH:
+	case C.AKEYCODE_MANNER_MODE:
+	case C.AKEYCODE_3D_MODE:
+	case C.AKEYCODE_CONTACTS:
+	case C.AKEYCODE_CALENDAR:
+	case C.AKEYCODE_MUSIC:
+	case C.AKEYCODE_CALCULATOR:
+	}
+	/* Defined in an NDK API version beyond what we use today:
+	C.AKEYCODE_ASSIST
+	C.AKEYCODE_BRIGHTNESS_DOWN
+	C.AKEYCODE_BRIGHTNESS_UP
+	C.AKEYCODE_EISU
+	C.AKEYCODE_HENKAN
+	C.AKEYCODE_KANA
+	C.AKEYCODE_KATAKANA_HIRAGANA
+	C.AKEYCODE_MEDIA_AUDIO_TRACK
+	C.AKEYCODE_MUHENKAN
+	C.AKEYCODE_RO
+	C.AKEYCODE_YEN
+	C.AKEYCODE_ZENKAKU_HANKAKU
+	*/
+	return key.CodeUnknown
+}

vendor/github.com/ebitengine/gomobile/app/app.go

@@ -0,0 +1,213 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux || darwin || windows
+
+package app
+
+import (
+	"github.com/ebitengine/gomobile/event/lifecycle"
+	"github.com/ebitengine/gomobile/event/size"
+	"github.com/ebitengine/gomobile/gl"
+	_ "github.com/ebitengine/gomobile/internal/mobileinit"
+)
+
+// Main is called by the main.main function to run the mobile application.
+//
+// It calls f on the App, in a separate goroutine, as some OS-specific
+// libraries require being on 'the main thread'.
+func Main(f func(App)) {
+	main(f)
+}
+
+// App is how a GUI mobile application interacts with the OS.
+type App interface {
+	// Events returns the events channel. It carries events from the system to
+	// the app. The type of such events include:
+	//  - lifecycle.Event
+	//  - mouse.Event
+	//  - paint.Event
+	//  - size.Event
+	//  - touch.Event
+	// from the github.com/ebitengine/gomobile/event/etc packages. Other packages may
+	// define other event types that are carried on this channel.
+	Events() <-chan interface{}
+
+	// Send sends an event on the events channel. It does not block.
+	Send(event interface{})
+
+	// Publish flushes any pending drawing commands, such as OpenGL calls, and
+	// swaps the back buffer to the screen.
+	Publish() PublishResult
+
+	// TODO: replace filters (and the Events channel) with a NextEvent method?
+
+	// Filter calls each registered event filter function in sequence.
+	Filter(event interface{}) interface{}
+
+	// RegisterFilter registers a event filter function to be called by Filter. The
+	// function can return a different event, or return nil to consume the event,
+	// but the function can also return its argument unchanged, where its purpose
+	// is to trigger a side effect rather than modify the event.
+	RegisterFilter(f func(interface{}) interface{})
+}
+
+// PublishResult is the result of an App.Publish call.
+type PublishResult struct {
+	// BackBufferPreserved is whether the contents of the back buffer was
+	// preserved. If false, the contents are undefined.
+	BackBufferPreserved bool
+}
+
+var theApp = &app{
+	eventsOut:      make(chan interface{}),
+	lifecycleStage: lifecycle.StageDead,
+	publish:        make(chan struct{}),
+	publishResult:  make(chan PublishResult),
+}
+
+func init() {
+	theApp.eventsIn = pump(theApp.eventsOut)
+	theApp.glctx, theApp.worker = gl.NewContext()
+}
+
+func (a *app) sendLifecycle(to lifecycle.Stage) {
+	if a.lifecycleStage == to {
+		return
+	}
+	a.eventsIn <- lifecycle.Event{
+		From:        a.lifecycleStage,
+		To:          to,
+		DrawContext: a.glctx,
+	}
+	a.lifecycleStage = to
+}
+
+type app struct {
+	filters []func(interface{}) interface{}
+
+	eventsOut      chan interface{}
+	eventsIn       chan interface{}
+	lifecycleStage lifecycle.Stage
+	publish        chan struct{}
+	publishResult  chan PublishResult
+
+	glctx  gl.Context
+	worker gl.Worker
+}
+
+func (a *app) Events() <-chan interface{} {
+	return a.eventsOut
+}
+
+func (a *app) Send(event interface{}) {
+	a.eventsIn <- event
+}
+
+func (a *app) Publish() PublishResult {
+	// gl.Flush is a lightweight (on modern GL drivers) blocking call
+	// that ensures all GL functions pending in the gl package have
+	// been passed onto the GL driver before the app package attempts
+	// to swap the screen buffer.
+	//
+	// This enforces that the final receive (for this paint cycle) on
+	// gl.WorkAvailable happens before the send on endPaint.
+	a.glctx.Flush()
+	a.publish <- struct{}{}
+	return <-a.publishResult
+}
+
+func (a *app) Filter(event interface{}) interface{} {
+	for _, f := range a.filters {
+		event = f(event)
+	}
+	return event
+}
+
+func (a *app) RegisterFilter(f func(interface{}) interface{}) {
+	a.filters = append(a.filters, f)
+}
+
+type stopPumping struct{}
+
+// pump returns a channel src such that sending on src will eventually send on
+// dst, in order, but that src will always be ready to send/receive soon, even
+// if dst currently isn't. It is effectively an infinitely buffered channel.
+//
+// In particular, goroutine A sending on src will not deadlock even if goroutine
+// B that's responsible for receiving on dst is currently blocked trying to
+// send to A on a separate channel.
+//
+// Send a stopPumping on the src channel to close the dst channel after all queued
+// events are sent on dst. After that, other goroutines can still send to src,
+// so that such sends won't block forever, but such events will be ignored.
+func pump(dst chan interface{}) (src chan interface{}) {
+	src = make(chan interface{})
+	go func() {
+		// initialSize is the initial size of the circular buffer. It must be a
+		// power of 2.
+		const initialSize = 16
+		i, j, buf, mask := 0, 0, make([]interface{}, initialSize), initialSize-1
+
+		srcActive := true
+		for {
+			maybeDst := dst
+			if i == j {
+				maybeDst = nil
+			}
+			if maybeDst == nil && !srcActive {
+				// Pump is stopped and empty.
+				break
+			}
+
+			select {
+			case maybeDst <- buf[i&mask]:
+				buf[i&mask] = nil
+				i++
+
+			case e := <-src:
+				if _, ok := e.(stopPumping); ok {
+					srcActive = false
+					continue
+				}
+
+				if !srcActive {
+					continue
+				}
+
+				// Allocate a bigger buffer if necessary.
+				if i+len(buf) == j {
+					b := make([]interface{}, 2*len(buf))
+					n := copy(b, buf[j&mask:])
+					copy(b[n:], buf[:j&mask])
+					i, j = 0, len(buf)
+					buf, mask = b, len(b)-1
+				}
+
+				buf[j&mask] = e
+				j++
+			}
+		}
+
+		close(dst)
+		// Block forever.
+		for range src {
+		}
+	}()
+	return src
+}
+
+// TODO: do this for all build targets, not just linux (x11 and Android)? If
+// so, should package gl instead of this package call RegisterFilter??
+//
+// TODO: does Android need this?? It seems to work without it (Nexus 7,
+// KitKat). If only x11 needs this, should we move this to x11.go??
+func (a *app) registerGLViewportFilter() {
+	a.RegisterFilter(func(e interface{}) interface{} {
+		if e, ok := e.(size.Event); ok {
+			a.glctx.Viewport(0, 0, e.WidthPx, e.HeightPx)
+		}
+		return e
+	})
+}

vendor/github.com/ebitengine/gomobile/app/app_windows.go

@@ -0,0 +1,13 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package app
+
+import (
+	"log"
+)
+
+func main(f func(a App)) {
+	log.Fatal("main is not implemented on Windows")
+}

vendor/github.com/ebitengine/gomobile/app/darwin_desktop.go

@@ -0,0 +1,495 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && !ios
+
+package app
+
+// Simple on-screen app debugging for OS X. Not an officially supported
+// development target for apps, as screens with mice are very different
+// than screens with touch panels.
+
+/*
+#cgo CFLAGS: -x objective-c -DGL_SILENCE_DEPRECATION
+#cgo LDFLAGS: -framework Cocoa -framework OpenGL
+#import <Carbon/Carbon.h> // for HIToolbox/Events.h
+#import <Cocoa/Cocoa.h>
+#include <pthread.h>
+
+void runApp(void);
+void stopApp(void);
+void makeCurrentContext(GLintptr);
+uint64 threadID();
+*/
+import "C"
+import (
+	"log"
+	"runtime"
+	"sync"
+
+	"github.com/ebitengine/gomobile/event/key"
+	"github.com/ebitengine/gomobile/event/lifecycle"
+	"github.com/ebitengine/gomobile/event/paint"
+	"github.com/ebitengine/gomobile/event/size"
+	"github.com/ebitengine/gomobile/event/touch"
+	"github.com/ebitengine/gomobile/geom"
+)
+
+var initThreadID uint64
+
+func init() {
+	// Lock the goroutine responsible for initialization to an OS thread.
+	// This means the goroutine running main (and calling runApp below)
+	// is locked to the OS thread that started the program. This is
+	// necessary for the correct delivery of Cocoa events to the process.
+	//
+	// A discussion on this topic:
+	// https://groups.google.com/forum/#!msg/golang-nuts/IiWZ2hUuLDA/SNKYYZBelsYJ
+	runtime.LockOSThread()
+	initThreadID = uint64(C.threadID())
+}
+
+func main(f func(App)) {
+	if tid := uint64(C.threadID()); tid != initThreadID {
+		log.Fatalf("app.Main called on thread %d, but app.init ran on %d", tid, initThreadID)
+	}
+
+	go func() {
+		f(theApp)
+		C.stopApp()
+	}()
+
+	C.runApp()
+}
+
+// loop is the primary drawing loop.
+//
+// After Cocoa has captured the initial OS thread for processing Cocoa
+// events in runApp, it starts loop on another goroutine. It is locked
+// to an OS thread for its OpenGL context.
+//
+// The loop processes GL calls until a publish event appears.
+// Then it runs any remaining GL calls and flushes the screen.
+//
+// As NSOpenGLCPSwapInterval is set to 1, the call to CGLFlushDrawable
+// blocks until the screen refresh.
+func (a *app) loop(ctx C.GLintptr) {
+	runtime.LockOSThread()
+	C.makeCurrentContext(ctx)
+
+	workAvailable := a.worker.WorkAvailable()
+
+	for {
+		select {
+		case <-workAvailable:
+			a.worker.DoWork()
+		case <-theApp.publish:
+		loop1:
+			for {
+				select {
+				case <-workAvailable:
+					a.worker.DoWork()
+				default:
+					break loop1
+				}
+			}
+			C.CGLFlushDrawable(C.CGLGetCurrentContext())
+			theApp.publishResult <- PublishResult{}
+			select {
+			case drawDone <- struct{}{}:
+			default:
+			}
+		}
+	}
+}
+
+var drawDone = make(chan struct{})
+
+// drawgl is used by Cocoa to occasionally request screen updates.
+//
+//export drawgl
+func drawgl() {
+	switch theApp.lifecycleStage {
+	case lifecycle.StageFocused, lifecycle.StageVisible:
+		theApp.Send(paint.Event{
+			External: true,
+		})
+		<-drawDone
+	}
+}
+
+//export startloop
+func startloop(ctx C.GLintptr) {
+	go theApp.loop(ctx)
+}
+
+var windowHeightPx float32
+
+//export setGeom
+func setGeom(pixelsPerPt float32, widthPx, heightPx int) {
+	windowHeightPx = float32(heightPx)
+	theApp.eventsIn <- size.Event{
+		WidthPx:     widthPx,
+		HeightPx:    heightPx,
+		WidthPt:     geom.Pt(float32(widthPx) / pixelsPerPt),
+		HeightPt:    geom.Pt(float32(heightPx) / pixelsPerPt),
+		PixelsPerPt: pixelsPerPt,
+	}
+}
+
+var touchEvents struct {
+	sync.Mutex
+	pending []touch.Event
+}
+
+func sendTouch(t touch.Type, x, y float32) {
+	theApp.eventsIn <- touch.Event{
+		X:        x,
+		Y:        windowHeightPx - y,
+		Sequence: 0,
+		Type:     t,
+	}
+}
+
+//export eventMouseDown
+func eventMouseDown(x, y float32) { sendTouch(touch.TypeBegin, x, y) }
+
+//export eventMouseDragged
+func eventMouseDragged(x, y float32) { sendTouch(touch.TypeMove, x, y) }
+
+//export eventMouseEnd
+func eventMouseEnd(x, y float32) { sendTouch(touch.TypeEnd, x, y) }
+
+//export lifecycleDead
+func lifecycleDead() { theApp.sendLifecycle(lifecycle.StageDead) }
+
+//export eventKey
+func eventKey(runeVal int32, direction uint8, code uint16, flags uint32) {
+	var modifiers key.Modifiers
+	for _, mod := range mods {
+		if flags&mod.flags == mod.flags {
+			modifiers |= mod.mod
+		}
+	}
+
+	theApp.eventsIn <- key.Event{
+		Rune:      convRune(rune(runeVal)),
+		Code:      convVirtualKeyCode(code),
+		Modifiers: modifiers,
+		Direction: key.Direction(direction),
+	}
+}
+
+//export eventFlags
+func eventFlags(flags uint32) {
+	for _, mod := range mods {
+		if flags&mod.flags == mod.flags && lastFlags&mod.flags != mod.flags {
+			eventKey(-1, uint8(key.DirPress), mod.code, flags)
+		}
+		if lastFlags&mod.flags == mod.flags && flags&mod.flags != mod.flags {
+			eventKey(-1, uint8(key.DirRelease), mod.code, flags)
+		}
+	}
+	lastFlags = flags
+}
+
+var lastFlags uint32
+
+var mods = [...]struct {
+	flags uint32
+	code  uint16
+	mod   key.Modifiers
+}{
+	// Left and right variants of modifier keys have their own masks,
+	// but they are not documented. These were determined empirically.
+	{1<<17 | 0x102, C.kVK_Shift, key.ModShift},
+	{1<<17 | 0x104, C.kVK_RightShift, key.ModShift},
+	{1<<18 | 0x101, C.kVK_Control, key.ModControl},
+	// TODO key.ControlRight
+	{1<<19 | 0x120, C.kVK_Option, key.ModAlt},
+	{1<<19 | 0x140, C.kVK_RightOption, key.ModAlt},
+	{1<<20 | 0x108, C.kVK_Command, key.ModMeta},
+	{1<<20 | 0x110, C.kVK_Command, key.ModMeta}, // TODO: missing kVK_RightCommand
+}
+
+//export lifecycleAlive
+func lifecycleAlive() { theApp.sendLifecycle(lifecycle.StageAlive) }
+
+//export lifecycleVisible
+func lifecycleVisible() {
+	theApp.sendLifecycle(lifecycle.StageVisible)
+}
+
+//export lifecycleFocused
+func lifecycleFocused() { theApp.sendLifecycle(lifecycle.StageFocused) }
+
+// convRune marks the Carbon/Cocoa private-range unicode rune representing
+// a non-unicode key event to -1, used for Rune in the key package.
+//
+// http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/CORPCHAR.TXT
+func convRune(r rune) rune {
+	if '\uE000' <= r && r <= '\uF8FF' {
+		return -1
+	}
+	return r
+}
+
+// convVirtualKeyCode converts a Carbon/Cocoa virtual key code number
+// into the standard keycodes used by the key package.
+//
+// To get a sense of the key map, see the diagram on
+//
+//	http://boredzo.org/blog/archives/2007-05-22/virtual-key-codes
+func convVirtualKeyCode(vkcode uint16) key.Code {
+	switch vkcode {
+	case C.kVK_ANSI_A:
+		return key.CodeA
+	case C.kVK_ANSI_B:
+		return key.CodeB
+	case C.kVK_ANSI_C:
+		return key.CodeC
+	case C.kVK_ANSI_D:
+		return key.CodeD
+	case C.kVK_ANSI_E:
+		return key.CodeE
+	case C.kVK_ANSI_F:
+		return key.CodeF
+	case C.kVK_ANSI_G:
+		return key.CodeG
+	case C.kVK_ANSI_H:
+		return key.CodeH
+	case C.kVK_ANSI_I:
+		return key.CodeI
+	case C.kVK_ANSI_J:
+		return key.CodeJ
+	case C.kVK_ANSI_K:
+		return key.CodeK
+	case C.kVK_ANSI_L:
+		return key.CodeL
+	case C.kVK_ANSI_M:
+		return key.CodeM
+	case C.kVK_ANSI_N:
+		return key.CodeN
+	case C.kVK_ANSI_O:
+		return key.CodeO
+	case C.kVK_ANSI_P:
+		return key.CodeP
+	case C.kVK_ANSI_Q:
+		return key.CodeQ
+	case C.kVK_ANSI_R:
+		return key.CodeR
+	case C.kVK_ANSI_S:
+		return key.CodeS
+	case C.kVK_ANSI_T:
+		return key.CodeT
+	case C.kVK_ANSI_U:
+		return key.CodeU
+	case C.kVK_ANSI_V:
+		return key.CodeV
+	case C.kVK_ANSI_W:
+		return key.CodeW
+	case C.kVK_ANSI_X:
+		return key.CodeX
+	case C.kVK_ANSI_Y:
+		return key.CodeY
+	case C.kVK_ANSI_Z:
+		return key.CodeZ
+	case C.kVK_ANSI_1:
+		return key.Code1
+	case C.kVK_ANSI_2:
+		return key.Code2
+	case C.kVK_ANSI_3:
+		return key.Code3
+	case C.kVK_ANSI_4:
+		return key.Code4
+	case C.kVK_ANSI_5:
+		return key.Code5
+	case C.kVK_ANSI_6:
+		return key.Code6
+	case C.kVK_ANSI_7:
+		return key.Code7
+	case C.kVK_ANSI_8:
+		return key.Code8
+	case C.kVK_ANSI_9:
+		return key.Code9
+	case C.kVK_ANSI_0:
+		return key.Code0
+	// TODO: move the rest of these codes to constants in key.go
+	// if we are happy with them.
+	case C.kVK_Return:
+		return key.CodeReturnEnter
+	case C.kVK_Escape:
+		return key.CodeEscape
+	case C.kVK_Delete:
+		return key.CodeDeleteBackspace
+	case C.kVK_Tab:
+		return key.CodeTab
+	case C.kVK_Space:
+		return key.CodeSpacebar
+	case C.kVK_ANSI_Minus:
+		return key.CodeHyphenMinus
+	case C.kVK_ANSI_Equal:
+		return key.CodeEqualSign
+	case C.kVK_ANSI_LeftBracket:
+		return key.CodeLeftSquareBracket
+	case C.kVK_ANSI_RightBracket:
+		return key.CodeRightSquareBracket
+	case C.kVK_ANSI_Backslash:
+		return key.CodeBackslash
+	// 50: Keyboard Non-US "#" and ~
+	case C.kVK_ANSI_Semicolon:
+		return key.CodeSemicolon
+	case C.kVK_ANSI_Quote:
+		return key.CodeApostrophe
+	case C.kVK_ANSI_Grave:
+		return key.CodeGraveAccent
+	case C.kVK_ANSI_Comma:
+		return key.CodeComma
+	case C.kVK_ANSI_Period:
+		return key.CodeFullStop
+	case C.kVK_ANSI_Slash:
+		return key.CodeSlash
+	case C.kVK_CapsLock:
+		return key.CodeCapsLock
+	case C.kVK_F1:
+		return key.CodeF1
+	case C.kVK_F2:
+		return key.CodeF2
+	case C.kVK_F3:
+		return key.CodeF3
+	case C.kVK_F4:
+		return key.CodeF4
+	case C.kVK_F5:
+		return key.CodeF5
+	case C.kVK_F6:
+		return key.CodeF6
+	case C.kVK_F7:
+		return key.CodeF7
+	case C.kVK_F8:
+		return key.CodeF8
+	case C.kVK_F9:
+		return key.CodeF9
+	case C.kVK_F10:
+		return key.CodeF10
+	case C.kVK_F11:
+		return key.CodeF11
+	case C.kVK_F12:
+		return key.CodeF12
+	// 70: PrintScreen
+	// 71: Scroll Lock
+	// 72: Pause
+	// 73: Insert
+	case C.kVK_Home:
+		return key.CodeHome
+	case C.kVK_PageUp:
+		return key.CodePageUp
+	case C.kVK_ForwardDelete:
+		return key.CodeDeleteForward
+	case C.kVK_End:
+		return key.CodeEnd
+	case C.kVK_PageDown:
+		return key.CodePageDown
+	case C.kVK_RightArrow:
+		return key.CodeRightArrow
+	case C.kVK_LeftArrow:
+		return key.CodeLeftArrow
+	case C.kVK_DownArrow:
+		return key.CodeDownArrow
+	case C.kVK_UpArrow:
+		return key.CodeUpArrow
+	case C.kVK_ANSI_KeypadClear:
+		return key.CodeKeypadNumLock
+	case C.kVK_ANSI_KeypadDivide:
+		return key.CodeKeypadSlash
+	case C.kVK_ANSI_KeypadMultiply:
+		return key.CodeKeypadAsterisk
+	case C.kVK_ANSI_KeypadMinus:
+		return key.CodeKeypadHyphenMinus
+	case C.kVK_ANSI_KeypadPlus:
+		return key.CodeKeypadPlusSign
+	case C.kVK_ANSI_KeypadEnter:
+		return key.CodeKeypadEnter
+	case C.kVK_ANSI_Keypad1:
+		return key.CodeKeypad1
+	case C.kVK_ANSI_Keypad2:
+		return key.CodeKeypad2
+	case C.kVK_ANSI_Keypad3:
+		return key.CodeKeypad3
+	case C.kVK_ANSI_Keypad4:
+		return key.CodeKeypad4
+	case C.kVK_ANSI_Keypad5:
+		return key.CodeKeypad5
+	case C.kVK_ANSI_Keypad6:
+		return key.CodeKeypad6
+	case C.kVK_ANSI_Keypad7:
+		return key.CodeKeypad7
+	case C.kVK_ANSI_Keypad8:
+		return key.CodeKeypad8
+	case C.kVK_ANSI_Keypad9:
+		return key.CodeKeypad9
+	case C.kVK_ANSI_Keypad0:
+		return key.CodeKeypad0
+	case C.kVK_ANSI_KeypadDecimal:
+		return key.CodeKeypadFullStop
+	case C.kVK_ANSI_KeypadEquals:
+		return key.CodeKeypadEqualSign
+	case C.kVK_F13:
+		return key.CodeF13
+	case C.kVK_F14:
+		return key.CodeF14
+	case C.kVK_F15:
+		return key.CodeF15
+	case C.kVK_F16:
+		return key.CodeF16
+	case C.kVK_F17:
+		return key.CodeF17
+	case C.kVK_F18:
+		return key.CodeF18
+	case C.kVK_F19:
+		return key.CodeF19
+	case C.kVK_F20:
+		return key.CodeF20
+	// 116: Keyboard Execute
+	case C.kVK_Help:
+		return key.CodeHelp
+	// 118: Keyboard Menu
+	// 119: Keyboard Select
+	// 120: Keyboard Stop
+	// 121: Keyboard Again
+	// 122: Keyboard Undo
+	// 123: Keyboard Cut
+	// 124: Keyboard Copy
+	// 125: Keyboard Paste
+	// 126: Keyboard Find
+	case C.kVK_Mute:
+		return key.CodeMute
+	case C.kVK_VolumeUp:
+		return key.CodeVolumeUp
+	case C.kVK_VolumeDown:
+		return key.CodeVolumeDown
+	// 130: Keyboard Locking Caps Lock
+	// 131: Keyboard Locking Num Lock
+	// 132: Keyboard Locking Scroll Lock
+	// 133: Keyboard Comma
+	// 134: Keyboard Equal Sign
+	// ...: Bunch of stuff
+	case C.kVK_Control:
+		return key.CodeLeftControl
+	case C.kVK_Shift:
+		return key.CodeLeftShift
+	case C.kVK_Option:
+		return key.CodeLeftAlt
+	case C.kVK_Command:
+		return key.CodeLeftGUI
+	case C.kVK_RightControl:
+		return key.CodeRightControl
+	case C.kVK_RightShift:
+		return key.CodeRightShift
+	case C.kVK_RightOption:
+		return key.CodeRightAlt
+	// TODO key.CodeRightGUI
+	default:
+		return key.CodeUnknown
+	}
+}

vendor/github.com/ebitengine/gomobile/app/darwin_desktop.m

@@ -0,0 +1,251 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && !ios
+// +build darwin
+// +build !ios
+
+#include "_cgo_export.h"
+#include <pthread.h>
+#include <stdio.h>
+
+#import <Cocoa/Cocoa.h>
+#import <Foundation/Foundation.h>
+#import <OpenGL/gl3.h>
+
+void makeCurrentContext(GLintptr context) {
+	NSOpenGLContext* ctx = (NSOpenGLContext*)context;
+	[ctx makeCurrentContext];
+}
+
+uint64 threadID() {
+	uint64 id;
+	if (pthread_threadid_np(pthread_self(), &id)) {
+		abort();
+	}
+	return id;
+}
+
+@interface MobileGLView : NSOpenGLView<NSApplicationDelegate, NSWindowDelegate>
+{
+}
+@end
+
+@implementation MobileGLView
+- (void)prepareOpenGL {
+	[super prepareOpenGL];
+	[self setWantsBestResolutionOpenGLSurface:YES];
+	GLint swapInt = 1;
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+	[[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
+#pragma clang diagnostic pop
+
+	// Using attribute arrays in OpenGL 3.3 requires the use of a VBA.
+	// But VBAs don't exist in ES 2. So we bind a default one.
+	GLuint vba;
+	glGenVertexArrays(1, &vba);
+	glBindVertexArray(vba);
+
+	startloop((GLintptr)[self openGLContext]);
+}
+
+- (void)reshape {
+	[super reshape];
+
+	// Calculate screen PPI.
+	//
+	// Note that the backingScaleFactor converts from logical
+	// pixels to actual pixels, but both of these units vary
+	// independently from real world size. E.g.
+	//
+	// 13" Retina Macbook Pro, 2560x1600, 227ppi, backingScaleFactor=2, scale=3.15
+	// 15" Retina Macbook Pro, 2880x1800, 220ppi, backingScaleFactor=2, scale=3.06
+	// 27" iMac,               2560x1440, 109ppi, backingScaleFactor=1, scale=1.51
+	// 27" Retina iMac,        5120x2880, 218ppi, backingScaleFactor=2, scale=3.03
+	NSScreen *screen = [NSScreen mainScreen];
+	double screenPixW = [screen frame].size.width * [screen backingScaleFactor];
+
+	CGDirectDisplayID display = (CGDirectDisplayID)[[[screen deviceDescription] valueForKey:@"NSScreenNumber"] intValue];
+	CGSize screenSizeMM = CGDisplayScreenSize(display); // in millimeters
+	float ppi = 25.4 * screenPixW / screenSizeMM.width;
+	float pixelsPerPt = ppi/72.0;
+
+	// The width and height reported to the geom package are the
+	// bounds of the OpenGL view. Several steps are necessary.
+	// First, [self bounds] gives us the number of logical pixels
+	// in the view. Multiplying this by the backingScaleFactor
+	// gives us the number of actual pixels.
+	NSRect r = [self bounds];
+	int w = r.size.width * [screen backingScaleFactor];
+	int h = r.size.height * [screen backingScaleFactor];
+
+	setGeom(pixelsPerPt, w, h);
+}
+
+- (void)drawRect:(NSRect)theRect {
+	// Called during resize. This gets rid of flicker when resizing.
+	drawgl();
+}
+
+- (void)mouseDown:(NSEvent *)theEvent {
+	double scale = [[NSScreen mainScreen] backingScaleFactor];
+	NSPoint p = [theEvent locationInWindow];
+	eventMouseDown(p.x * scale, p.y * scale);
+}
+
+- (void)mouseUp:(NSEvent *)theEvent {
+	double scale = [[NSScreen mainScreen] backingScaleFactor];
+	NSPoint p = [theEvent locationInWindow];
+	eventMouseEnd(p.x * scale, p.y * scale);
+}
+
+- (void)mouseDragged:(NSEvent *)theEvent {
+	double scale = [[NSScreen mainScreen] backingScaleFactor];
+	NSPoint p = [theEvent locationInWindow];
+	eventMouseDragged(p.x * scale, p.y * scale);
+}
+
+- (void)windowDidBecomeKey:(NSNotification *)notification {
+	lifecycleFocused();
+}
+
+- (void)windowDidResignKey:(NSNotification *)notification {
+	if (![NSApp isHidden]) {
+		lifecycleVisible();
+	}
+}
+
+- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
+	lifecycleAlive();
+	[[NSRunningApplication currentApplication] activateWithOptions:(NSApplicationActivateAllWindows | NSApplicationActivateIgnoringOtherApps)];
+	[self.window makeKeyAndOrderFront:self];
+	lifecycleVisible();
+}
+
+- (void)applicationWillTerminate:(NSNotification *)aNotification {
+	lifecycleDead();
+}
+
+- (void)applicationDidHide:(NSNotification *)aNotification {
+	lifecycleAlive();
+}
+
+- (void)applicationWillUnhide:(NSNotification *)notification {
+	lifecycleVisible();
+}
+
+- (void)windowWillClose:(NSNotification *)notification {
+	lifecycleAlive();
+}
+@end
+
+@interface MobileResponder : NSResponder
+{
+}
+@end
+
+@implementation MobileResponder
+- (void)keyDown:(NSEvent *)theEvent {
+	[self key:theEvent];
+}
+- (void)keyUp:(NSEvent *)theEvent {
+	[self key:theEvent];
+}
+- (void)key:(NSEvent *)theEvent {
+	NSRange range = [theEvent.characters rangeOfComposedCharacterSequenceAtIndex:0];
+
+	uint8_t buf[4] = {0, 0, 0, 0};
+	if (![theEvent.characters getBytes:buf
+			maxLength:4
+			usedLength:nil
+			encoding:NSUTF32LittleEndianStringEncoding
+			options:NSStringEncodingConversionAllowLossy
+			range:range
+			remainingRange:nil]) {
+		NSLog(@"failed to read key event %@", theEvent);
+		return;
+	}
+
+	uint32_t rune = (uint32_t)buf[0]<<0 | (uint32_t)buf[1]<<8 | (uint32_t)buf[2]<<16 | (uint32_t)buf[3]<<24;
+
+	uint8_t direction;
+	if ([theEvent isARepeat]) {
+		direction = 0;
+	} else if (theEvent.type == NSEventTypeKeyDown) {
+		direction = 1;
+	} else {
+		direction = 2;
+	}
+	eventKey((int32_t)rune, direction, theEvent.keyCode, theEvent.modifierFlags);
+}
+
+- (void)flagsChanged:(NSEvent *)theEvent {
+	eventFlags(theEvent.modifierFlags);
+}
+@end
+
+void
+runApp(void) {
+	[NSAutoreleasePool new];
+	[NSApplication sharedApplication];
+	[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
+
+	id menuBar = [[NSMenu new] autorelease];
+	id menuItem = [[NSMenuItem new] autorelease];
+	[menuBar addItem:menuItem];
+	[NSApp setMainMenu:menuBar];
+
+	id menu = [[NSMenu new] autorelease];
+	id name = [[NSProcessInfo processInfo] processName];
+
+	id hideMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Hide"
+		action:@selector(hide:) keyEquivalent:@"h"]
+		autorelease];
+	[menu addItem:hideMenuItem];
+
+	id quitMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Quit"
+		action:@selector(terminate:) keyEquivalent:@"q"]
+		autorelease];
+	[menu addItem:quitMenuItem];
+	[menuItem setSubmenu:menu];
+
+	NSRect rect = NSMakeRect(0, 0, 600, 800);
+
+	NSWindow* window = [[[NSWindow alloc] initWithContentRect:rect
+			styleMask:NSWindowStyleMaskTitled
+			backing:NSBackingStoreBuffered
+			defer:NO]
+		autorelease];
+	window.styleMask |= NSWindowStyleMaskResizable;
+	window.styleMask |= NSWindowStyleMaskMiniaturizable;
+	window.styleMask |= NSWindowStyleMaskClosable;
+	window.title = name;
+	[window cascadeTopLeftFromPoint:NSMakePoint(20,20)];
+
+	NSOpenGLPixelFormatAttribute attr[] = {
+		NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
+		NSOpenGLPFAColorSize,     24,
+		NSOpenGLPFAAlphaSize,     8,
+		NSOpenGLPFADepthSize,     16,
+		NSOpenGLPFAAccelerated,
+		NSOpenGLPFADoubleBuffer,
+		NSOpenGLPFAAllowOfflineRenderers,
+		0
+	};
+	id pixFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attr];
+	MobileGLView* view = [[MobileGLView alloc] initWithFrame:rect pixelFormat:pixFormat];
+	[window setContentView:view];
+	[window setDelegate:view];
+	[NSApp setDelegate:view];
+
+	window.nextResponder = [[[MobileResponder alloc] init] autorelease];
+
+	[NSApp run];
+}
+
+void stopApp(void) {
+	[NSApp terminate:nil];
+}

vendor/github.com/ebitengine/gomobile/app/darwin_ios.go

@@ -0,0 +1,215 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && ios
+
+package app
+
+/*
+#cgo CFLAGS: -x objective-c -DGL_SILENCE_DEPRECATION -DGLES_SILENCE_DEPRECATION
+#cgo LDFLAGS: -framework Foundation -framework UIKit -framework GLKit -framework OpenGLES -framework QuartzCore
+#include <sys/utsname.h>
+#include <stdint.h>
+#include <pthread.h>
+#include <UIKit/UIDevice.h>
+#import <GLKit/GLKit.h>
+
+extern struct utsname sysInfo;
+
+void runApp(void);
+void makeCurrentContext(GLintptr ctx);
+void swapBuffers(GLintptr ctx);
+uint64_t threadID();
+*/
+import "C"
+import (
+	"log"
+	"runtime"
+	"strings"
+	"sync"
+
+	"github.com/ebitengine/gomobile/event/lifecycle"
+	"github.com/ebitengine/gomobile/event/paint"
+	"github.com/ebitengine/gomobile/event/size"
+	"github.com/ebitengine/gomobile/event/touch"
+	"github.com/ebitengine/gomobile/geom"
+)
+
+var initThreadID uint64
+
+func init() {
+	// Lock the goroutine responsible for initialization to an OS thread.
+	// This means the goroutine running main (and calling the run function
+	// below) is locked to the OS thread that started the program. This is
+	// necessary for the correct delivery of UIKit events to the process.
+	//
+	// A discussion on this topic:
+	// https://groups.google.com/forum/#!msg/golang-nuts/IiWZ2hUuLDA/SNKYYZBelsYJ
+	runtime.LockOSThread()
+	initThreadID = uint64(C.threadID())
+}
+
+func main(f func(App)) {
+	if tid := uint64(C.threadID()); tid != initThreadID {
+		log.Fatalf("app.Run called on thread %d, but app.init ran on %d", tid, initThreadID)
+	}
+
+	go func() {
+		f(theApp)
+		// TODO(crawshaw): trigger runApp to return
+	}()
+	C.runApp()
+	panic("unexpected return from app.runApp")
+}
+
+var pixelsPerPt float32
+var screenScale int // [UIScreen mainScreen].scale, either 1, 2, or 3.
+
+//export setScreen
+func setScreen(scale int) {
+	C.uname(&C.sysInfo)
+	name := C.GoString(&C.sysInfo.machine[0])
+
+	var v float32
+
+	switch {
+	case strings.HasPrefix(name, "iPhone"):
+		v = 163
+	case strings.HasPrefix(name, "iPad"):
+		// TODO: is there a better way to distinguish the iPad Mini?
+		switch name {
+		case "iPad2,5", "iPad2,6", "iPad2,7", "iPad4,4", "iPad4,5", "iPad4,6", "iPad4,7":
+			v = 163 // iPad Mini
+		default:
+			v = 132
+		}
+	default:
+		v = 163 // names like i386 and x86_64 are the simulator
+	}
+
+	if v == 0 {
+		log.Printf("unknown machine: %s", name)
+		v = 163 // emergency fallback
+	}
+
+	pixelsPerPt = v * float32(scale) / 72
+	screenScale = scale
+}
+
+//export updateConfig
+func updateConfig(width, height, orientation int32) {
+	o := size.OrientationUnknown
+	switch orientation {
+	case C.UIDeviceOrientationPortrait, C.UIDeviceOrientationPortraitUpsideDown:
+		o = size.OrientationPortrait
+	case C.UIDeviceOrientationLandscapeLeft, C.UIDeviceOrientationLandscapeRight:
+		o = size.OrientationLandscape
+	}
+	widthPx := screenScale * int(width)
+	heightPx := screenScale * int(height)
+	theApp.eventsIn <- size.Event{
+		WidthPx:     widthPx,
+		HeightPx:    heightPx,
+		WidthPt:     geom.Pt(float32(widthPx) / pixelsPerPt),
+		HeightPt:    geom.Pt(float32(heightPx) / pixelsPerPt),
+		PixelsPerPt: pixelsPerPt,
+		Orientation: o,
+	}
+	theApp.eventsIn <- paint.Event{External: true}
+}
+
+// touchIDs is the current active touches. The position in the array
+// is the ID, the value is the UITouch* pointer value.
+//
+// It is widely reported that the iPhone can handle up to 5 simultaneous
+// touch events, while the iPad can handle 11.
+var touchIDs [11]uintptr
+
+var touchEvents struct {
+	sync.Mutex
+	pending []touch.Event
+}
+
+//export sendTouch
+func sendTouch(cTouch, cTouchType uintptr, x, y float32) {
+	id := -1
+	for i, val := range touchIDs {
+		if val == cTouch {
+			id = i
+			break
+		}
+	}
+	if id == -1 {
+		for i, val := range touchIDs {
+			if val == 0 {
+				touchIDs[i] = cTouch
+				id = i
+				break
+			}
+		}
+		if id == -1 {
+			panic("out of touchIDs")
+		}
+	}
+
+	t := touch.Type(cTouchType)
+	if t == touch.TypeEnd {
+		touchIDs[id] = 0
+	}
+
+	theApp.eventsIn <- touch.Event{
+		X:        x,
+		Y:        y,
+		Sequence: touch.Sequence(id),
+		Type:     t,
+	}
+}
+
+//export lifecycleDead
+func lifecycleDead() { theApp.sendLifecycle(lifecycle.StageDead) }
+
+//export lifecycleAlive
+func lifecycleAlive() { theApp.sendLifecycle(lifecycle.StageAlive) }
+
+//export lifecycleVisible
+func lifecycleVisible() { theApp.sendLifecycle(lifecycle.StageVisible) }
+
+//export lifecycleFocused
+func lifecycleFocused() { theApp.sendLifecycle(lifecycle.StageFocused) }
+
+//export startloop
+func startloop(ctx C.GLintptr) {
+	go theApp.loop(ctx)
+}
+
+// loop is the primary drawing loop.
+//
+// After UIKit has captured the initial OS thread for processing UIKit
+// events in runApp, it starts loop on another goroutine. It is locked
+// to an OS thread for its OpenGL context.
+func (a *app) loop(ctx C.GLintptr) {
+	runtime.LockOSThread()
+	C.makeCurrentContext(ctx)
+
+	workAvailable := a.worker.WorkAvailable()
+
+	for {
+		select {
+		case <-workAvailable:
+			a.worker.DoWork()
+		case <-theApp.publish:
+		loop1:
+			for {
+				select {
+				case <-workAvailable:
+					a.worker.DoWork()
+				default:
+					break loop1
+				}
+			}
+			C.swapBuffers(ctx)
+			theApp.publishResult <- PublishResult{}
+		}
+	}
+}

vendor/github.com/ebitengine/gomobile/app/darwin_ios.m

@@ -0,0 +1,167 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin && ios
+// +build darwin
+// +build ios
+
+#include "_cgo_export.h"
+#include <pthread.h>
+#include <stdio.h>
+#include <sys/utsname.h>
+
+#import <UIKit/UIKit.h>
+#import <GLKit/GLKit.h>
+
+struct utsname sysInfo;
+
+@interface GoAppAppController : GLKViewController<UIContentContainer, GLKViewDelegate>
+@end
+
+@interface GoAppAppDelegate : UIResponder<UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@property (strong, nonatomic) GoAppAppController *controller;
+@end
+
+@implementation GoAppAppDelegate
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+	lifecycleAlive();
+	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+	self.controller = [[GoAppAppController alloc] initWithNibName:nil bundle:nil];
+	self.window.rootViewController = self.controller;
+	[self.window makeKeyAndVisible];
+	return YES;
+}
+
+- (void)applicationDidBecomeActive:(UIApplication * )application {
+	lifecycleFocused();
+}
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+	lifecycleVisible();
+}
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+	lifecycleAlive();
+}
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+	lifecycleDead();
+}
+@end
+
+@interface GoAppAppController ()
+@property (strong, nonatomic) EAGLContext *context;
+@property (strong, nonatomic) GLKView *glview;
+@end
+
+@implementation GoAppAppController
+- (void)viewWillAppear:(BOOL)animated
+{
+	// TODO: replace by swapping out GLKViewController for a UIVIewController.
+	[super viewWillAppear:animated];
+	self.paused = YES;
+}
+
+- (void)viewDidLoad {
+	[super viewDidLoad];
+	self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
+	self.glview = (GLKView*)self.view;
+	self.glview.drawableDepthFormat = GLKViewDrawableDepthFormat24;
+	self.glview.multipleTouchEnabled = true; // TODO expose setting to user.
+	self.glview.context = self.context;
+	self.glview.userInteractionEnabled = YES;
+	self.glview.enableSetNeedsDisplay = YES; // only invoked once
+
+	// Do not use the GLKViewController draw loop.
+	self.paused = YES;
+	self.resumeOnDidBecomeActive = NO;
+	self.preferredFramesPerSecond = 0;
+
+	int scale = 1;
+	if ([[UIScreen mainScreen] respondsToSelector:@selector(displayLinkWithTarget:selector:)]) {
+		scale = (int)[UIScreen mainScreen].scale; // either 1.0, 2.0, or 3.0.
+	}
+	setScreen(scale);
+
+	CGSize size = [UIScreen mainScreen].bounds.size;
+	UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
+	updateConfig((int)size.width, (int)size.height, orientation);
+}
+
+- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
+	[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
+		// TODO(crawshaw): come up with a plan to handle animations.
+	} completion:^(id<UIViewControllerTransitionCoordinatorContext> context) {
+		UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
+		updateConfig((int)size.width, (int)size.height, orientation);
+	}];
+}
+
+- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect {
+	// Now that we have been asked to do the first draw, disable any
+	// future draw and hand control over to the Go paint.Event cycle.
+	self.glview.enableSetNeedsDisplay = NO;
+	startloop((GLintptr)self.context);
+}
+
+#define TOUCH_TYPE_BEGIN 0 // touch.TypeBegin
+#define TOUCH_TYPE_MOVE  1 // touch.TypeMove
+#define TOUCH_TYPE_END   2 // touch.TypeEnd
+
+static void sendTouches(int change, NSSet* touches) {
+	CGFloat scale = [UIScreen mainScreen].scale;
+	for (UITouch* touch in touches) {
+		CGPoint p = [touch locationInView:touch.view];
+		sendTouch((GoUintptr)touch, (GoUintptr)change, p.x*scale, p.y*scale);
+	}
+}
+
+- (void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event {
+	sendTouches(TOUCH_TYPE_BEGIN, touches);
+}
+
+- (void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event {
+	sendTouches(TOUCH_TYPE_MOVE, touches);
+}
+
+- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {
+	sendTouches(TOUCH_TYPE_END, touches);
+}
+
+- (void)touchesCanceled:(NSSet*)touches withEvent:(UIEvent*)event {
+    sendTouches(TOUCH_TYPE_END, touches);
+}
+@end
+
+void runApp(void) {
+	char* argv[] = {};
+	@autoreleasepool {
+		UIApplicationMain(0, argv, nil, NSStringFromClass([GoAppAppDelegate class]));
+	}
+}
+
+void makeCurrentContext(GLintptr context) {
+	EAGLContext* ctx = (EAGLContext*)context;
+	if (![EAGLContext setCurrentContext:ctx]) {
+		// TODO(crawshaw): determine how terrible this is. Exit?
+		NSLog(@"failed to set current context");
+	}
+}
+
+void swapBuffers(GLintptr context) {
+	__block EAGLContext* ctx = (EAGLContext*)context;
+	dispatch_sync(dispatch_get_main_queue(), ^{
+		[EAGLContext setCurrentContext:ctx];
+		[ctx presentRenderbuffer:GL_RENDERBUFFER];
+	});
+}
+
+uint64_t threadID() {
+	uint64_t id;
+	if (pthread_threadid_np(pthread_self(), &id)) {
+		abort();
+	}
+	return id;
+}

vendor/github.com/ebitengine/gomobile/app/doc.go

@@ -0,0 +1,88 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package app lets you write portable all-Go apps for Android and iOS.
+
+There are typically two ways to use Go on Android and iOS. The first
+is to write a Go library and use `gomobile bind` to generate language
+bindings for Java and Objective-C. Building a library does not
+require the app package. The `gomobile bind` command produces output
+that you can include in an Android Studio or Xcode project. For more
+on language bindings, see https://github.com/ebitengine/gomobile/cmd/gobind.
+
+The second way is to write an app entirely in Go. The APIs are limited
+to those that are portable between both Android and iOS, in particular
+OpenGL, audio, and other Android NDK-like APIs. An all-Go app should
+use this app package to initialize the app, manage its lifecycle, and
+receive events.
+
+# Building apps
+
+Apps written entirely in Go have a main function, and can be built
+with `gomobile build`, which directly produces runnable output for
+Android and iOS.
+
+The gomobile tool can get installed with go get. For reference, see
+https://github.com/ebitengine/gomobile/cmd/gomobile.
+
+For detailed instructions and documentation, see
+https://golang.org/wiki/Mobile.
+
+# Event processing in Native Apps
+
+The Go runtime is initialized on Android when NativeActivity onCreate is
+called, and on iOS when the process starts. In both cases, Go init functions
+run before the app lifecycle has started.
+
+An app is expected to call the Main function in main.main. When the function
+exits, the app exits. Inside the func passed to Main, call Filter on every
+event received, and then switch on its type. Registered filters run when the
+event is received, not when it is sent, so that filters run in the same
+goroutine as other code that calls OpenGL.
+
+	package main
+
+	import (
+		"log"
+
+		"github.com/ebitengine/gomobile/app"
+		"github.com/ebitengine/gomobile/event/lifecycle"
+		"github.com/ebitengine/gomobile/event/paint"
+	)
+
+	func main() {
+		app.Main(func(a app.App) {
+			for e := range a.Events() {
+				switch e := a.Filter(e).(type) {
+				case lifecycle.Event:
+					// ...
+				case paint.Event:
+					log.Print("Call OpenGL here.")
+					a.Publish()
+				}
+			}
+		})
+	}
+
+An event is represented by the empty interface type interface{}. Any value can
+be an event. Commonly used types include Event types defined by the following
+packages:
+  - github.com/ebitengine/gomobile/event/lifecycle
+  - github.com/ebitengine/gomobile/event/mouse
+  - github.com/ebitengine/gomobile/event/paint
+  - github.com/ebitengine/gomobile/event/size
+  - github.com/ebitengine/gomobile/event/touch
+
+For example, touch.Event is the type that represents touch events. Other
+packages may define their own events, and send them on an app's event channel.
+
+Other packages can also register event filters, e.g. to manage resources in
+response to lifecycle events. Such packages should call:
+
+	app.RegisterFilter(etc)
+
+in an init function inside that package.
+*/
+package app // import "github.com/ebitengine/gomobile/app"

vendor/github.com/ebitengine/gomobile/app/internal/callfn/callfn.go

@@ -0,0 +1,16 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build android && (arm || 386 || amd64 || arm64)
+
+// Package callfn provides an android entry point.
+//
+// It is a separate package from app because it contains Go assembly,
+// which does not compile in a package using cgo.
+package callfn
+
+// CallFn calls a zero-argument function by its program counter.
+// It is only intended for calling main.main. Using it for
+// anything else will not end well.
+func CallFn(fn uintptr)

vendor/github.com/ebitengine/gomobile/app/internal/callfn/callfn_386.s

@@ -0,0 +1,11 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "funcdata.h"
+
+TEXT ·CallFn(SB),$0-4
+	MOVL fn+0(FP), AX
+	CALL AX
+	RET

vendor/github.com/ebitengine/gomobile/app/internal/callfn/callfn_amd64.s

@@ -0,0 +1,11 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "funcdata.h"
+
+TEXT ·CallFn(SB),$0-8
+	MOVQ fn+0(FP), AX
+	CALL AX
+	RET

vendor/github.com/ebitengine/gomobile/app/internal/callfn/callfn_arm.s

@@ -0,0 +1,11 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "funcdata.h"
+
+TEXT ·CallFn(SB),$0-4
+	MOVW fn+0(FP), R0
+	BL (R0)
+	RET

vendor/github.com/ebitengine/gomobile/app/internal/callfn/callfn_arm64.s

@@ -0,0 +1,11 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "funcdata.h"
+
+TEXT ·CallFn(SB),$0-8
+	MOVD fn+0(FP), R0
+	BL (R0)
+	RET

vendor/github.com/ebitengine/gomobile/app/x11.c

@@ -0,0 +1,175 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && !android
+// +build linux,!android
+
+#include "_cgo_export.h"
+#include <EGL/egl.h>
+#include <GLES2/gl2.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static Atom wm_delete_window;
+
+static Window
+new_window(Display *x_dpy, EGLDisplay e_dpy, int w, int h, EGLContext *ctx, EGLSurface *surf) {
+	static const EGLint attribs[] = {
+		EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+		EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
+		EGL_BLUE_SIZE, 8,
+		EGL_GREEN_SIZE, 8,
+		EGL_RED_SIZE, 8,
+		EGL_DEPTH_SIZE, 16,
+		EGL_CONFIG_CAVEAT, EGL_NONE,
+		EGL_NONE
+	};
+	EGLConfig config;
+	EGLint num_configs;
+	if (!eglChooseConfig(e_dpy, attribs, &config, 1, &num_configs)) {
+		fprintf(stderr, "eglChooseConfig failed\n");
+		exit(1);
+	}
+	EGLint vid;
+	if (!eglGetConfigAttrib(e_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
+		fprintf(stderr, "eglGetConfigAttrib failed\n");
+		exit(1);
+	}
+
+	XVisualInfo visTemplate;
+	visTemplate.visualid = vid;
+	int num_visuals;
+	XVisualInfo *visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
+	if (!visInfo) {
+		fprintf(stderr, "XGetVisualInfo failed\n");
+		exit(1);
+	}
+
+	Window root = RootWindow(x_dpy, DefaultScreen(x_dpy));
+	XSetWindowAttributes attr;
+
+	attr.colormap = XCreateColormap(x_dpy, root, visInfo->visual, AllocNone);
+	if (!attr.colormap) {
+		fprintf(stderr, "XCreateColormap failed\n");
+		exit(1);
+	}
+
+	attr.event_mask = StructureNotifyMask | ExposureMask |
+		ButtonPressMask | ButtonReleaseMask | ButtonMotionMask;
+	Window win = XCreateWindow(
+		x_dpy, root, 0, 0, w, h, 0, visInfo->depth, InputOutput,
+		visInfo->visual, CWColormap | CWEventMask, &attr);
+	XFree(visInfo);
+
+	XSizeHints sizehints;
+	sizehints.width  = w;
+	sizehints.height = h;
+	sizehints.flags = USSize;
+	XSetNormalHints(x_dpy, win, &sizehints);
+	XSetStandardProperties(x_dpy, win, "App", "App", None, (char **)NULL, 0, &sizehints);
+
+	static const EGLint ctx_attribs[] = {
+		EGL_CONTEXT_CLIENT_VERSION, 2,
+		EGL_NONE
+	};
+	*ctx = eglCreateContext(e_dpy, config, EGL_NO_CONTEXT, ctx_attribs);
+	if (!*ctx) {
+		fprintf(stderr, "eglCreateContext failed\n");
+		exit(1);
+	}
+	*surf = eglCreateWindowSurface(e_dpy, config, win, NULL);
+	if (!*surf) {
+		fprintf(stderr, "eglCreateWindowSurface failed\n");
+		exit(1);
+	}
+	return win;
+}
+
+Display *x_dpy;
+EGLDisplay e_dpy;
+EGLContext e_ctx;
+EGLSurface e_surf;
+Window win;
+
+void
+createWindow(void) {
+	x_dpy = XOpenDisplay(NULL);
+	if (!x_dpy) {
+		fprintf(stderr, "XOpenDisplay failed\n");
+		exit(1);
+	}
+	e_dpy = eglGetDisplay(x_dpy);
+	if (!e_dpy) {
+		fprintf(stderr, "eglGetDisplay failed\n");
+		exit(1);
+	}
+	EGLint e_major, e_minor;
+	if (!eglInitialize(e_dpy, &e_major, &e_minor)) {
+		fprintf(stderr, "eglInitialize failed\n");
+		exit(1);
+	}
+	eglBindAPI(EGL_OPENGL_ES_API);
+	win = new_window(x_dpy, e_dpy, 600, 800, &e_ctx, &e_surf);
+
+	wm_delete_window = XInternAtom(x_dpy, "WM_DELETE_WINDOW", True);
+	if (wm_delete_window != None) {
+		XSetWMProtocols(x_dpy, win, &wm_delete_window, 1);
+	}
+
+	XMapWindow(x_dpy, win);
+	if (!eglMakeCurrent(e_dpy, e_surf, e_surf, e_ctx)) {
+		fprintf(stderr, "eglMakeCurrent failed\n");
+		exit(1);
+	}
+
+	// Window size and DPI should be initialized before starting app.
+	XEvent ev;
+	while (1) {
+		if (XCheckMaskEvent(x_dpy, StructureNotifyMask, &ev) == False) {
+			continue;
+		}
+		if (ev.type == ConfigureNotify) {
+			onResize(ev.xconfigure.width, ev.xconfigure.height);
+			break;
+		}
+	}
+}
+
+void
+processEvents(void) {
+	while (XPending(x_dpy)) {
+		XEvent ev;
+		XNextEvent(x_dpy, &ev);
+		switch (ev.type) {
+		case ButtonPress:
+			onTouchBegin((float)ev.xbutton.x, (float)ev.xbutton.y);
+			break;
+		case ButtonRelease:
+			onTouchEnd((float)ev.xbutton.x, (float)ev.xbutton.y);
+			break;
+		case MotionNotify:
+			onTouchMove((float)ev.xmotion.x, (float)ev.xmotion.y);
+			break;
+		case ConfigureNotify:
+			onResize(ev.xconfigure.width, ev.xconfigure.height);
+			break;
+		case ClientMessage:
+			if (wm_delete_window != None && (Atom)ev.xclient.data.l[0] == wm_delete_window) {
+				onStop();
+				return;
+			}
+			break;
+		}
+	}
+}
+
+void
+swapBuffers(void) {
+	if (eglSwapBuffers(e_dpy, e_surf) == EGL_FALSE) {
+		fprintf(stderr, "eglSwapBuffer failed\n");
+		exit(1);
+	}
+}

vendor/github.com/ebitengine/gomobile/app/x11.go

@@ -0,0 +1,126 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux && !android
+
+package app
+
+/*
+Simple on-screen app debugging for X11. Not an officially supported
+development target for apps, as screens with mice are very different
+than screens with touch panels.
+*/
+
+/*
+#cgo LDFLAGS: -lEGL -lGLESv2 -lX11
+
+void createWindow(void);
+void processEvents(void);
+void swapBuffers(void);
+*/
+import "C"
+import (
+	"runtime"
+	"time"
+
+	"github.com/ebitengine/gomobile/event/lifecycle"
+	"github.com/ebitengine/gomobile/event/paint"
+	"github.com/ebitengine/gomobile/event/size"
+	"github.com/ebitengine/gomobile/event/touch"
+	"github.com/ebitengine/gomobile/geom"
+)
+
+func init() {
+	theApp.registerGLViewportFilter()
+}
+
+func main(f func(App)) {
+	runtime.LockOSThread()
+
+	workAvailable := theApp.worker.WorkAvailable()
+
+	C.createWindow()
+
+	// TODO: send lifecycle events when e.g. the X11 window is iconified or moved off-screen.
+	theApp.sendLifecycle(lifecycle.StageFocused)
+
+	// TODO: translate X11 expose events to shiny paint events, instead of
+	// sending this synthetic paint event as a hack.
+	theApp.eventsIn <- paint.Event{}
+
+	donec := make(chan struct{})
+	go func() {
+		// close the donec channel in a defer statement
+		// so that we could still be able to return even
+		// if f panics.
+		defer close(donec)
+
+		f(theApp)
+	}()
+
+	// TODO: can we get the actual vsync signal?
+	ticker := time.NewTicker(time.Second / 60)
+	defer ticker.Stop()
+	var tc <-chan time.Time
+
+	for {
+		select {
+		case <-donec:
+			return
+		case <-workAvailable:
+			theApp.worker.DoWork()
+		case <-theApp.publish:
+			C.swapBuffers()
+			tc = ticker.C
+		case <-tc:
+			tc = nil
+			theApp.publishResult <- PublishResult{}
+		}
+		C.processEvents()
+	}
+}
+
+//export onResize
+func onResize(w, h int) {
+	// TODO(nigeltao): don't assume 72 DPI. DisplayWidth and DisplayWidthMM
+	// is probably the best place to start looking.
+	pixelsPerPt := float32(1)
+	theApp.eventsIn <- size.Event{
+		WidthPx:     w,
+		HeightPx:    h,
+		WidthPt:     geom.Pt(w),
+		HeightPt:    geom.Pt(h),
+		PixelsPerPt: pixelsPerPt,
+	}
+}
+
+func sendTouch(t touch.Type, x, y float32) {
+	theApp.eventsIn <- touch.Event{
+		X:        x,
+		Y:        y,
+		Sequence: 0, // TODO: button??
+		Type:     t,
+	}
+}
+
+//export onTouchBegin
+func onTouchBegin(x, y float32) { sendTouch(touch.TypeBegin, x, y) }
+
+//export onTouchMove
+func onTouchMove(x, y float32) { sendTouch(touch.TypeMove, x, y) }
+
+//export onTouchEnd
+func onTouchEnd(x, y float32) { sendTouch(touch.TypeEnd, x, y) }
+
+var stopped bool
+
+//export onStop
+func onStop() {
+	if stopped {
+		return
+	}
+	stopped = true
+	theApp.sendLifecycle(lifecycle.StageDead)
+	theApp.eventsIn <- stopPumping{}
+}

vendor/github.com/ebitengine/gomobile/event/key/code_string.go

@@ -0,0 +1,60 @@
+// Code generated by "stringer -type=Code"; DO NOT EDIT
+
+package key
+
+import "fmt"
+
+const (
+	_Code_name_0 = "CodeUnknown"
+	_Code_name_1 = "CodeACodeBCodeCCodeDCodeECodeFCodeGCodeHCodeICodeJCodeKCodeLCodeMCodeNCodeOCodePCodeQCodeRCodeSCodeTCodeUCodeVCodeWCodeXCodeYCodeZCode1Code2Code3Code4Code5Code6Code7Code8Code9Code0CodeReturnEnterCodeEscapeCodeDeleteBackspaceCodeTabCodeSpacebarCodeHyphenMinusCodeEqualSignCodeLeftSquareBracketCodeRightSquareBracketCodeBackslash"
+	_Code_name_2 = "CodeSemicolonCodeApostropheCodeGraveAccentCodeCommaCodeFullStopCodeSlashCodeCapsLockCodeF1CodeF2CodeF3CodeF4CodeF5CodeF6CodeF7CodeF8CodeF9CodeF10CodeF11CodeF12"
+	_Code_name_3 = "CodePauseCodeInsertCodeHomeCodePageUpCodeDeleteForwardCodeEndCodePageDownCodeRightArrowCodeLeftArrowCodeDownArrowCodeUpArrowCodeKeypadNumLockCodeKeypadSlashCodeKeypadAsteriskCodeKeypadHyphenMinusCodeKeypadPlusSignCodeKeypadEnterCodeKeypad1CodeKeypad2CodeKeypad3CodeKeypad4CodeKeypad5CodeKeypad6CodeKeypad7CodeKeypad8CodeKeypad9CodeKeypad0CodeKeypadFullStop"
+	_Code_name_4 = "CodeKeypadEqualSignCodeF13CodeF14CodeF15CodeF16CodeF17CodeF18CodeF19CodeF20CodeF21CodeF22CodeF23CodeF24"
+	_Code_name_5 = "CodeHelp"
+	_Code_name_6 = "CodeMuteCodeVolumeUpCodeVolumeDown"
+	_Code_name_7 = "CodeLeftControlCodeLeftShiftCodeLeftAltCodeLeftGUICodeRightControlCodeRightShiftCodeRightAltCodeRightGUI"
+	_Code_name_8 = "CodeCompose"
+)
+
+var (
+	_Code_index_0 = [...]uint8{0, 11}
+	_Code_index_1 = [...]uint16{0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 165, 170, 175, 180, 195, 205, 224, 231, 243, 258, 271, 292, 314, 327}
+	_Code_index_2 = [...]uint8{0, 13, 27, 42, 51, 63, 72, 84, 90, 96, 102, 108, 114, 120, 126, 132, 138, 145, 152, 159}
+	_Code_index_3 = [...]uint16{0, 9, 19, 27, 37, 54, 61, 73, 87, 100, 113, 124, 141, 156, 174, 195, 213, 228, 239, 250, 261, 272, 283, 294, 305, 316, 327, 338, 356}
+	_Code_index_4 = [...]uint8{0, 19, 26, 33, 40, 47, 54, 61, 68, 75, 82, 89, 96, 103}
+	_Code_index_5 = [...]uint8{0, 8}
+	_Code_index_6 = [...]uint8{0, 8, 20, 34}
+	_Code_index_7 = [...]uint8{0, 15, 28, 39, 50, 66, 80, 92, 104}
+	_Code_index_8 = [...]uint8{0, 11}
+)
+
+func (i Code) String() string {
+	switch {
+	case i == 0:
+		return _Code_name_0
+	case 4 <= i && i <= 49:
+		i -= 4
+		return _Code_name_1[_Code_index_1[i]:_Code_index_1[i+1]]
+	case 51 <= i && i <= 69:
+		i -= 51
+		return _Code_name_2[_Code_index_2[i]:_Code_index_2[i+1]]
+	case 72 <= i && i <= 99:
+		i -= 72
+		return _Code_name_3[_Code_index_3[i]:_Code_index_3[i+1]]
+	case 103 <= i && i <= 115:
+		i -= 103
+		return _Code_name_4[_Code_index_4[i]:_Code_index_4[i+1]]
+	case i == 117:
+		return _Code_name_5
+	case 127 <= i && i <= 129:
+		i -= 127
+		return _Code_name_6[_Code_index_6[i]:_Code_index_6[i+1]]
+	case 224 <= i && i <= 231:
+		i -= 224
+		return _Code_name_7[_Code_index_7[i]:_Code_index_7[i+1]]
+	case i == 65536:
+		return _Code_name_8
+	default:
+		return fmt.Sprintf("Code(%d)", i)
+	}
+}

vendor/github.com/ebitengine/gomobile/event/key/key.go

@@ -0,0 +1,270 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:generate stringer -type=Code
+
+// Package key defines an event for physical keyboard keys.
+//
+// On-screen software keyboards do not send key events.
+//
+// See the github.com/ebitengine/gomobile/app package for details on the event model.
+package key
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Event is a key event.
+type Event struct {
+	// Rune is the meaning of the key event as determined by the
+	// operating system. The mapping is determined by system-dependent
+	// current layout, modifiers, lock-states, etc.
+	//
+	// If non-negative, it is a Unicode codepoint: pressing the 'a' key
+	// generates different Runes 'a' or 'A' (but the same Code) depending on
+	// the state of the shift key.
+	//
+	// If -1, the key does not generate a Unicode codepoint. To distinguish
+	// them, look at Code.
+	Rune rune
+
+	// Code is the identity of the physical key relative to a notional
+	// "standard" keyboard, independent of current layout, modifiers,
+	// lock-states, etc
+	//
+	// For standard key codes, its value matches USB HID key codes.
+	// Compare its value to uint32-typed constants in this package, such
+	// as CodeLeftShift and CodeEscape.
+	//
+	// Pressing the regular '2' key and number-pad '2' key (with Num-Lock)
+	// generate different Codes (but the same Rune).
+	Code Code
+
+	// Modifiers is a bitmask representing a set of modifier keys: ModShift,
+	// ModAlt, etc.
+	Modifiers Modifiers
+
+	// Direction is the direction of the key event: DirPress, DirRelease,
+	// or DirNone (for key repeats).
+	Direction Direction
+
+	// TODO: add a Device ID, for multiple input devices?
+	// TODO: add a time.Time?
+}
+
+func (e Event) String() string {
+	if e.Rune >= 0 {
+		return fmt.Sprintf("key.Event{%q (%v), %v, %v}", e.Rune, e.Code, e.Modifiers, e.Direction)
+	}
+	return fmt.Sprintf("key.Event{(%v), %v, %v}", e.Code, e.Modifiers, e.Direction)
+}
+
+// Direction is the direction of the key event.
+type Direction uint8
+
+const (
+	DirNone    Direction = 0
+	DirPress   Direction = 1
+	DirRelease Direction = 2
+)
+
+// Modifiers is a bitmask representing a set of modifier keys.
+type Modifiers uint32
+
+const (
+	ModShift   Modifiers = 1 << 0
+	ModControl Modifiers = 1 << 1
+	ModAlt     Modifiers = 1 << 2
+	ModMeta    Modifiers = 1 << 3 // called "Command" on OS X
+)
+
+// Code is the identity of a key relative to a notional "standard" keyboard.
+type Code uint32
+
+// Physical key codes.
+//
+// For standard key codes, its value matches USB HID key codes.
+// TODO: add missing codes.
+const (
+	CodeUnknown Code = 0
+
+	CodeA Code = 4
+	CodeB Code = 5
+	CodeC Code = 6
+	CodeD Code = 7
+	CodeE Code = 8
+	CodeF Code = 9
+	CodeG Code = 10
+	CodeH Code = 11
+	CodeI Code = 12
+	CodeJ Code = 13
+	CodeK Code = 14
+	CodeL Code = 15
+	CodeM Code = 16
+	CodeN Code = 17
+	CodeO Code = 18
+	CodeP Code = 19
+	CodeQ Code = 20
+	CodeR Code = 21
+	CodeS Code = 22
+	CodeT Code = 23
+	CodeU Code = 24
+	CodeV Code = 25
+	CodeW Code = 26
+	CodeX Code = 27
+	CodeY Code = 28
+	CodeZ Code = 29
+
+	Code1 Code = 30
+	Code2 Code = 31
+	Code3 Code = 32
+	Code4 Code = 33
+	Code5 Code = 34
+	Code6 Code = 35
+	Code7 Code = 36
+	Code8 Code = 37
+	Code9 Code = 38
+	Code0 Code = 39
+
+	CodeReturnEnter        Code = 40
+	CodeEscape             Code = 41
+	CodeDeleteBackspace    Code = 42
+	CodeTab                Code = 43
+	CodeSpacebar           Code = 44
+	CodeHyphenMinus        Code = 45 // -
+	CodeEqualSign          Code = 46 // =
+	CodeLeftSquareBracket  Code = 47 // [
+	CodeRightSquareBracket Code = 48 // ]
+	CodeBackslash          Code = 49 // \
+	CodeSemicolon          Code = 51 // ;
+	CodeApostrophe         Code = 52 // '
+	CodeGraveAccent        Code = 53 // `
+	CodeComma              Code = 54 // ,
+	CodeFullStop           Code = 55 // .
+	CodeSlash              Code = 56 // /
+	CodeCapsLock           Code = 57
+
+	CodeF1  Code = 58
+	CodeF2  Code = 59
+	CodeF3  Code = 60
+	CodeF4  Code = 61
+	CodeF5  Code = 62
+	CodeF6  Code = 63
+	CodeF7  Code = 64
+	CodeF8  Code = 65
+	CodeF9  Code = 66
+	CodeF10 Code = 67
+	CodeF11 Code = 68
+	CodeF12 Code = 69
+
+	CodePause         Code = 72
+	CodeInsert        Code = 73
+	CodeHome          Code = 74
+	CodePageUp        Code = 75
+	CodeDeleteForward Code = 76
+	CodeEnd           Code = 77
+	CodePageDown      Code = 78
+
+	CodeRightArrow Code = 79
+	CodeLeftArrow  Code = 80
+	CodeDownArrow  Code = 81
+	CodeUpArrow    Code = 82
+
+	CodeKeypadNumLock     Code = 83
+	CodeKeypadSlash       Code = 84 // /
+	CodeKeypadAsterisk    Code = 85 // *
+	CodeKeypadHyphenMinus Code = 86 // -
+	CodeKeypadPlusSign    Code = 87 // +
+	CodeKeypadEnter       Code = 88
+	CodeKeypad1           Code = 89
+	CodeKeypad2           Code = 90
+	CodeKeypad3           Code = 91
+	CodeKeypad4           Code = 92
+	CodeKeypad5           Code = 93
+	CodeKeypad6           Code = 94
+	CodeKeypad7           Code = 95
+	CodeKeypad8           Code = 96
+	CodeKeypad9           Code = 97
+	CodeKeypad0           Code = 98
+	CodeKeypadFullStop    Code = 99  // .
+	CodeKeypadEqualSign   Code = 103 // =
+
+	CodeF13 Code = 104
+	CodeF14 Code = 105
+	CodeF15 Code = 106
+	CodeF16 Code = 107
+	CodeF17 Code = 108
+	CodeF18 Code = 109
+	CodeF19 Code = 110
+	CodeF20 Code = 111
+	CodeF21 Code = 112
+	CodeF22 Code = 113
+	CodeF23 Code = 114
+	CodeF24 Code = 115
+
+	CodeHelp Code = 117
+
+	CodeMute       Code = 127
+	CodeVolumeUp   Code = 128
+	CodeVolumeDown Code = 129
+
+	CodeLeftControl  Code = 224
+	CodeLeftShift    Code = 225
+	CodeLeftAlt      Code = 226
+	CodeLeftGUI      Code = 227
+	CodeRightControl Code = 228
+	CodeRightShift   Code = 229
+	CodeRightAlt     Code = 230
+	CodeRightGUI     Code = 231
+
+	// The following codes are not part of the standard USB HID Usage IDs for
+	// keyboards. See http://www.usb.org/developers/hidpage/Hut1_12v2.pdf
+	//
+	// Usage IDs are uint16s, so these non-standard values start at 0x10000.
+
+	// CodeCompose is the Code for a compose key, sometimes called a multi key,
+	// used to input non-ASCII characters such as ñ being composed of n and ~.
+	//
+	// See https://en.wikipedia.org/wiki/Compose_key
+	CodeCompose Code = 0x10000
+)
+
+// TODO: Given we use runes outside the unicode space, should we provide a
+// printing function? Related: it's a little unfortunate that printing a
+// key.Event with %v gives not very readable output like:
+//	{100 7 key.Modifiers() Press}
+
+var mods = [...]struct {
+	m Modifiers
+	s string
+}{
+	{ModShift, "Shift"},
+	{ModControl, "Control"},
+	{ModAlt, "Alt"},
+	{ModMeta, "Meta"},
+}
+
+func (m Modifiers) String() string {
+	var match []string
+	for _, mod := range mods {
+		if mod.m&m != 0 {
+			match = append(match, mod.s)
+		}
+	}
+	return "key.Modifiers(" + strings.Join(match, "|") + ")"
+}
+
+func (d Direction) String() string {
+	switch d {
+	case DirNone:
+		return "None"
+	case DirPress:
+		return "Press"
+	case DirRelease:
+		return "Release"
+	default:
+		return fmt.Sprintf("key.Direction(%d)", d)
+	}
+}

vendor/github.com/ebitengine/gomobile/event/lifecycle/lifecycle.go

@@ -0,0 +1,136 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package lifecycle defines an event for an app's lifecycle.
+//
+// The app lifecycle consists of moving back and forth between an ordered
+// sequence of stages. For example, being at a stage greater than or equal to
+// StageVisible means that the app is visible on the screen.
+//
+// A lifecycle event is a change from one stage to another, which crosses every
+// intermediate stage. For example, changing from StageAlive to StageFocused
+// implicitly crosses StageVisible.
+//
+// Crosses can be in a positive or negative direction. A positive crossing of
+// StageFocused means that the app has gained the focus. A negative crossing
+// means it has lost the focus.
+//
+// See the github.com/ebitengine/gomobile/app package for details on the event model.
+package lifecycle // import "github.com/ebitengine/gomobile/event/lifecycle"
+
+import (
+	"fmt"
+)
+
+// Cross is whether a lifecycle stage was crossed.
+type Cross uint32
+
+func (c Cross) String() string {
+	switch c {
+	case CrossOn:
+		return "on"
+	case CrossOff:
+		return "off"
+	}
+	return "none"
+}
+
+const (
+	CrossNone Cross = 0
+	CrossOn   Cross = 1
+	CrossOff  Cross = 2
+)
+
+// Event is a lifecycle change from an old stage to a new stage.
+type Event struct {
+	From, To Stage
+
+	// DrawContext is the state used for painting, if any is valid.
+	//
+	// For OpenGL apps, a non-nil DrawContext is a gl.Context.
+	//
+	// TODO: make this an App method if we move away from an event channel?
+	DrawContext interface{}
+}
+
+func (e Event) String() string {
+	return fmt.Sprintf("lifecycle.Event{From:%v, To:%v, DrawContext:%v}", e.From, e.To, e.DrawContext)
+}
+
+// Crosses reports whether the transition from From to To crosses the stage s:
+//   - It returns CrossOn if it does, and the lifecycle change is positive.
+//   - It returns CrossOff if it does, and the lifecycle change is negative.
+//   - Otherwise, it returns CrossNone.
+//
+// See the documentation for Stage for more discussion of positive and negative
+// crosses.
+func (e Event) Crosses(s Stage) Cross {
+	switch {
+	case e.From < s && e.To >= s:
+		return CrossOn
+	case e.From >= s && e.To < s:
+		return CrossOff
+	}
+	return CrossNone
+}
+
+// Stage is a stage in the app's lifecycle. The values are ordered, so that a
+// lifecycle change from stage From to stage To implicitly crosses every stage
+// in the range (min, max], exclusive on the low end and inclusive on the high
+// end, where min is the minimum of From and To, and max is the maximum.
+//
+// The documentation for individual stages talk about positive and negative
+// crosses. A positive lifecycle change is one where its From stage is less
+// than its To stage. Similarly, a negative lifecycle change is one where From
+// is greater than To. Thus, a positive lifecycle change crosses every stage in
+// the range (From, To] in increasing order, and a negative lifecycle change
+// crosses every stage in the range (To, From] in decreasing order.
+type Stage uint32
+
+// TODO: how does iOS map to these stages? What do cross-platform mobile
+// abstractions do?
+
+const (
+	// StageDead is the zero stage. No lifecycle change crosses this stage,
+	// but:
+	//	- A positive change from this stage is the very first lifecycle change.
+	//	- A negative change to this stage is the very last lifecycle change.
+	StageDead Stage = iota
+
+	// StageAlive means that the app is alive.
+	//	- A positive cross means that the app has been created.
+	//	- A negative cross means that the app is being destroyed.
+	// Each cross, either from or to StageDead, will occur only once.
+	// On Android, these correspond to onCreate and onDestroy.
+	StageAlive
+
+	// StageVisible means that the app window is visible.
+	//	- A positive cross means that the app window has become visible.
+	//	- A negative cross means that the app window has become invisible.
+	// On Android, these correspond to onStart and onStop.
+	// On Desktop, an app window can become invisible if e.g. it is minimized,
+	// unmapped, or not on a visible workspace.
+	StageVisible
+
+	// StageFocused means that the app window has the focus.
+	//	- A positive cross means that the app window has gained the focus.
+	//	- A negative cross means that the app window has lost the focus.
+	// On Android, these correspond to onResume and onFreeze.
+	StageFocused
+)
+
+func (s Stage) String() string {
+	switch s {
+	case StageDead:
+		return "StageDead"
+	case StageAlive:
+		return "StageAlive"
+	case StageVisible:
+		return "StageVisible"
+	case StageFocused:
+		return "StageFocused"
+	default:
+		return fmt.Sprintf("lifecycle.Stage(%d)", s)
+	}
+}

vendor/github.com/ebitengine/gomobile/event/paint/paint.go

@@ -0,0 +1,24 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package paint defines an event for the app being ready to paint.
+//
+// See the github.com/ebitengine/gomobile/app package for details on the event model.
+package paint // import "github.com/ebitengine/gomobile/event/paint"
+
+// Event indicates that the app is ready to paint the next frame of the GUI.
+//
+// A frame is completed by calling the App's Publish method.
+type Event struct {
+	// External is true for paint events sent by the screen driver.
+	//
+	// An external event may be sent at any time in response to an
+	// operating system event, for example the window opened, was
+	// resized, or the screen memory was lost.
+	//
+	// Programs actively drawing to the screen as fast as vsync allows
+	// should ignore external paint events to avoid a backlog of paint
+	// events building up.
+	External bool
+}

vendor/github.com/ebitengine/gomobile/event/size/size.go

@@ -0,0 +1,92 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package size defines an event for the dimensions, physical resolution and
+// orientation of the app's window.
+//
+// See the github.com/ebitengine/gomobile/app package for details on the event model.
+package size // import "github.com/ebitengine/gomobile/event/size"
+
+import (
+	"image"
+
+	"github.com/ebitengine/gomobile/geom"
+)
+
+// Event holds the dimensions, physical resolution and orientation of the app's
+// window.
+type Event struct {
+	// WidthPx and HeightPx are the window's dimensions in pixels.
+	WidthPx, HeightPx int
+
+	// WidthPt and HeightPt are the window's physical dimensions in points
+	// (1/72 of an inch).
+	//
+	// The values are based on PixelsPerPt and are therefore approximate, as
+	// per the comment on PixelsPerPt.
+	WidthPt, HeightPt geom.Pt
+
+	// PixelsPerPt is the window's physical resolution. It is the number of
+	// pixels in a single geom.Pt, from the github.com/ebitengine/gomobile/geom package.
+	//
+	// There are a wide variety of pixel densities in existing phones and
+	// tablets, so apps should be written to expect various non-integer
+	// PixelsPerPt values. In general, work in geom.Pt.
+	//
+	// The value is approximate, in that the OS, drivers or hardware may report
+	// approximate or quantized values. An N x N pixel square should be roughly
+	// 1 square inch for N = int(PixelsPerPt * 72), although different square
+	// lengths (in pixels) might be closer to 1 inch in practice. Nonetheless,
+	// this PixelsPerPt value should be consistent with e.g. the ratio of
+	// WidthPx to WidthPt.
+	PixelsPerPt float32
+
+	// Orientation is the orientation of the device screen.
+	Orientation Orientation
+}
+
+// Size returns the window's size in pixels, at the time this size event was
+// sent.
+func (e Event) Size() image.Point {
+	return image.Point{e.WidthPx, e.HeightPx}
+}
+
+// Bounds returns the window's bounds in pixels, at the time this size event
+// was sent.
+//
+// The top-left pixel is always (0, 0). The bottom-right pixel is given by the
+// width and height.
+func (e Event) Bounds() image.Rectangle {
+	return image.Rectangle{Max: image.Point{e.WidthPx, e.HeightPx}}
+}
+
+// Orientation is the orientation of the device screen.
+type Orientation int
+
+const (
+	// OrientationUnknown means device orientation cannot be determined.
+	//
+	// Equivalent on Android to Configuration.ORIENTATION_UNKNOWN
+	// and on iOS to:
+	//	UIDeviceOrientationUnknown
+	//	UIDeviceOrientationFaceUp
+	//	UIDeviceOrientationFaceDown
+	OrientationUnknown Orientation = iota
+
+	// OrientationPortrait is a device oriented so it is tall and thin.
+	//
+	// Equivalent on Android to Configuration.ORIENTATION_PORTRAIT
+	// and on iOS to:
+	//	UIDeviceOrientationPortrait
+	//	UIDeviceOrientationPortraitUpsideDown
+	OrientationPortrait
+
+	// OrientationLandscape is a device oriented so it is short and wide.
+	//
+	// Equivalent on Android to Configuration.ORIENTATION_LANDSCAPE
+	// and on iOS to:
+	//	UIDeviceOrientationLandscapeLeft
+	//	UIDeviceOrientationLandscapeRight
+	OrientationLandscape
+)

vendor/github.com/ebitengine/gomobile/event/touch/touch.go

@@ -0,0 +1,72 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package touch defines an event for touch input.
+//
+// See the github.com/ebitengine/gomobile/app package for details on the event model.
+package touch // import "github.com/ebitengine/gomobile/event/touch"
+
+// The best source on android input events is the NDK: include/android/input.h
+//
+// iOS event handling guide:
+// https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS
+
+import (
+	"fmt"
+)
+
+// Event is a touch event.
+type Event struct {
+	// X and Y are the touch location, in pixels.
+	X, Y float32
+
+	// Sequence is the sequence number. The same number is shared by all events
+	// in a sequence. A sequence begins with a single TypeBegin, is followed by
+	// zero or more TypeMoves, and ends with a single TypeEnd. A Sequence
+	// distinguishes concurrent sequences but its value is subsequently reused.
+	Sequence Sequence
+
+	// Type is the touch type.
+	Type Type
+}
+
+// Sequence identifies a sequence of touch events.
+type Sequence int64
+
+// Type describes the type of a touch event.
+type Type byte
+
+const (
+	// TypeBegin is a user first touching the device.
+	//
+	// On Android, this is a AMOTION_EVENT_ACTION_DOWN.
+	// On iOS, this is a call to touchesBegan.
+	TypeBegin Type = iota
+
+	// TypeMove is a user dragging across the device.
+	//
+	// A TypeMove is delivered between a TypeBegin and TypeEnd.
+	//
+	// On Android, this is a AMOTION_EVENT_ACTION_MOVE.
+	// On iOS, this is a call to touchesMoved.
+	TypeMove
+
+	// TypeEnd is a user no longer touching the device.
+	//
+	// On Android, this is a AMOTION_EVENT_ACTION_UP.
+	// On iOS, this is a call to touchesEnded.
+	TypeEnd
+)
+
+func (t Type) String() string {
+	switch t {
+	case TypeBegin:
+		return "begin"
+	case TypeMove:
+		return "move"
+	case TypeEnd:
+		return "end"
+	}
+	return fmt.Sprintf("touch.Type(%d)", t)
+}

vendor/github.com/ebitengine/gomobile/geom/geom.go

@@ -0,0 +1,102 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package geom defines a two-dimensional coordinate system.
+
+The coordinate system is based on an left-handed Cartesian plane.
+That is, X increases to the right and Y increases down. For (x,y),
+
+	(0,0) → (1,0)
+	  ↓   ↘
+	(0,1)   (1,1)
+
+The display window places the origin (0, 0) in the upper-left corner of
+the screen. Positions on the plane are measured in typographic points,
+1/72 of an inch, which is represented by the Pt type.
+
+Any interface that draws to the screen using types from the geom package
+scales the number of pixels to maintain a Pt as 1/72 of an inch.
+*/
+package geom // import "github.com/ebitengine/gomobile/geom"
+
+/*
+Notes on the various underlying coordinate systems.
+
+Both Android and iOS (UIKit) use upper-left-origin coordinate systems
+with for events, however they have different units.
+
+UIKit measures distance in points. A point is a single-pixel on a
+pre-Retina display. UIKit maintains a scale factor that to turn points
+into pixels. On current retina devices, the scale factor is 2.0.
+
+A UIKit point does not correspond to a fixed physical distance, as the
+iPhone has a 163 DPI/PPI (326 PPI retina) display, and the iPad has a
+132 PPI (264 retina) display. Points are 32-bit floats.
+
+Even though point is the official UIKit term, they are commonly called
+pixels. Indeed, the units were equivalent until the retina display was
+introduced.
+
+N.b. as a UIKit point is unrelated to a typographic point, it is not
+related to this packages's Pt and Point types.
+
+More details about iOS drawing:
+
+https://developer.apple.com/library/ios/documentation/2ddrawing/conceptual/drawingprintingios/GraphicsDrawingOverview/GraphicsDrawingOverview.html
+
+Android uses pixels. Sub-pixel precision is possible, so pixels are
+represented as 32-bit floats. The ACONFIGURATION_DENSITY enum provides
+the screen DPI/PPI, which varies frequently between devices.
+
+It would be tempting to adopt the pixel, given the clear pixel/DPI split
+in the core android events API. However, the plot thickens:
+
+http://developer.android.com/training/multiscreen/screendensities.html
+
+Android promotes the notion of a density-independent pixel in many of
+their interfaces, often prefixed by "dp". 1dp is a real physical length,
+as "independent" means it is assumed to be 1/160th of an inch and is
+adjusted for the current screen.
+
+In addition, android has a scale-indepdendent pixel used for expressing
+a user's preferred text size. The user text size preference is a useful
+notion not yet expressed in the geom package.
+
+For the sake of clarity when working across platforms, the geom package
+tries to put distance between it and the word pixel.
+*/
+
+import "fmt"
+
+// Pt is a length.
+//
+// The unit Pt is a typographical point, 1/72 of an inch (0.3527 mm).
+//
+// It can be converted to a length in current device pixels by
+// multiplying with PixelsPerPt after app initialization is complete.
+type Pt float32
+
+// Px converts the length to current device pixels.
+func (p Pt) Px(pixelsPerPt float32) float32 { return float32(p) * pixelsPerPt }
+
+// String returns a string representation of p like "3.2pt".
+func (p Pt) String() string { return fmt.Sprintf("%.2fpt", p) }
+
+// Point is a point in a two-dimensional plane.
+type Point struct {
+	X, Y Pt
+}
+
+// String returns a string representation of p like "(1.2,3.4)".
+func (p Point) String() string { return fmt.Sprintf("(%.2f,%.2f)", p.X, p.Y) }
+
+// A Rectangle is region of points.
+// The top-left point is Min, and the bottom-right point is Max.
+type Rectangle struct {
+	Min, Max Point
+}
+
+// String returns a string representation of r like "(3,4)-(6,5)".
+func (r Rectangle) String() string { return r.Min.String() + "-" + r.Max.String() }

vendor/github.com/ebitengine/gomobile/gl/consts.go

@@ -0,0 +1,657 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+/*
+Partially generated from the Khronos OpenGL API specification in XML
+format, which is covered by the license:
+
+	Copyright (c) 2013-2014 The Khronos Group Inc.
+
+	Permission is hereby granted, free of charge, to any person obtaining a
+	copy of this software and/or associated documentation files (the
+	"Materials"), to deal in the Materials without restriction, including
+	without limitation the rights to use, copy, modify, merge, publish,
+	distribute, sublicense, and/or sell copies of the Materials, and to
+	permit persons to whom the Materials are furnished to do so, subject to
+	the following conditions:
+
+	The above copyright notice and this permission notice shall be included
+	in all copies or substantial portions of the Materials.
+
+	THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+	IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+	CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+	TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+	MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+
+*/
+
+const (
+	POINTS                                       = 0x0000
+	LINES                                        = 0x0001
+	LINE_LOOP                                    = 0x0002
+	LINE_STRIP                                   = 0x0003
+	TRIANGLES                                    = 0x0004
+	TRIANGLE_STRIP                               = 0x0005
+	TRIANGLE_FAN                                 = 0x0006
+	SRC_COLOR                                    = 0x0300
+	ONE_MINUS_SRC_COLOR                          = 0x0301
+	SRC_ALPHA                                    = 0x0302
+	ONE_MINUS_SRC_ALPHA                          = 0x0303
+	DST_ALPHA                                    = 0x0304
+	ONE_MINUS_DST_ALPHA                          = 0x0305
+	DST_COLOR                                    = 0x0306
+	ONE_MINUS_DST_COLOR                          = 0x0307
+	SRC_ALPHA_SATURATE                           = 0x0308
+	FUNC_ADD                                     = 0x8006
+	BLEND_EQUATION                               = 0x8009
+	BLEND_EQUATION_RGB                           = 0x8009
+	BLEND_EQUATION_ALPHA                         = 0x883D
+	FUNC_SUBTRACT                                = 0x800A
+	FUNC_REVERSE_SUBTRACT                        = 0x800B
+	BLEND_DST_RGB                                = 0x80C8
+	BLEND_SRC_RGB                                = 0x80C9
+	BLEND_DST_ALPHA                              = 0x80CA
+	BLEND_SRC_ALPHA                              = 0x80CB
+	CONSTANT_COLOR                               = 0x8001
+	ONE_MINUS_CONSTANT_COLOR                     = 0x8002
+	CONSTANT_ALPHA                               = 0x8003
+	ONE_MINUS_CONSTANT_ALPHA                     = 0x8004
+	BLEND_COLOR                                  = 0x8005
+	ARRAY_BUFFER                                 = 0x8892
+	ELEMENT_ARRAY_BUFFER                         = 0x8893
+	ARRAY_BUFFER_BINDING                         = 0x8894
+	ELEMENT_ARRAY_BUFFER_BINDING                 = 0x8895
+	STREAM_DRAW                                  = 0x88E0
+	STATIC_DRAW                                  = 0x88E4
+	DYNAMIC_DRAW                                 = 0x88E8
+	BUFFER_SIZE                                  = 0x8764
+	BUFFER_USAGE                                 = 0x8765
+	CURRENT_VERTEX_ATTRIB                        = 0x8626
+	FRONT                                        = 0x0404
+	BACK                                         = 0x0405
+	FRONT_AND_BACK                               = 0x0408
+	TEXTURE_2D                                   = 0x0DE1
+	CULL_FACE                                    = 0x0B44
+	BLEND                                        = 0x0BE2
+	DITHER                                       = 0x0BD0
+	STENCIL_TEST                                 = 0x0B90
+	DEPTH_TEST                                   = 0x0B71
+	SCISSOR_TEST                                 = 0x0C11
+	POLYGON_OFFSET_FILL                          = 0x8037
+	SAMPLE_ALPHA_TO_COVERAGE                     = 0x809E
+	SAMPLE_COVERAGE                              = 0x80A0
+	INVALID_ENUM                                 = 0x0500
+	INVALID_VALUE                                = 0x0501
+	INVALID_OPERATION                            = 0x0502
+	OUT_OF_MEMORY                                = 0x0505
+	CW                                           = 0x0900
+	CCW                                          = 0x0901
+	LINE_WIDTH                                   = 0x0B21
+	ALIASED_POINT_SIZE_RANGE                     = 0x846D
+	ALIASED_LINE_WIDTH_RANGE                     = 0x846E
+	CULL_FACE_MODE                               = 0x0B45
+	FRONT_FACE                                   = 0x0B46
+	DEPTH_RANGE                                  = 0x0B70
+	DEPTH_WRITEMASK                              = 0x0B72
+	DEPTH_CLEAR_VALUE                            = 0x0B73
+	DEPTH_FUNC                                   = 0x0B74
+	STENCIL_CLEAR_VALUE                          = 0x0B91
+	STENCIL_FUNC                                 = 0x0B92
+	STENCIL_FAIL                                 = 0x0B94
+	STENCIL_PASS_DEPTH_FAIL                      = 0x0B95
+	STENCIL_PASS_DEPTH_PASS                      = 0x0B96
+	STENCIL_REF                                  = 0x0B97
+	STENCIL_VALUE_MASK                           = 0x0B93
+	STENCIL_WRITEMASK                            = 0x0B98
+	STENCIL_BACK_FUNC                            = 0x8800
+	STENCIL_BACK_FAIL                            = 0x8801
+	STENCIL_BACK_PASS_DEPTH_FAIL                 = 0x8802
+	STENCIL_BACK_PASS_DEPTH_PASS                 = 0x8803
+	STENCIL_BACK_REF                             = 0x8CA3
+	STENCIL_BACK_VALUE_MASK                      = 0x8CA4
+	STENCIL_BACK_WRITEMASK                       = 0x8CA5
+	VIEWPORT                                     = 0x0BA2
+	SCISSOR_BOX                                  = 0x0C10
+	COLOR_CLEAR_VALUE                            = 0x0C22
+	COLOR_WRITEMASK                              = 0x0C23
+	UNPACK_ALIGNMENT                             = 0x0CF5
+	PACK_ALIGNMENT                               = 0x0D05
+	MAX_TEXTURE_SIZE                             = 0x0D33
+	MAX_VIEWPORT_DIMS                            = 0x0D3A
+	SUBPIXEL_BITS                                = 0x0D50
+	RED_BITS                                     = 0x0D52
+	GREEN_BITS                                   = 0x0D53
+	BLUE_BITS                                    = 0x0D54
+	ALPHA_BITS                                   = 0x0D55
+	DEPTH_BITS                                   = 0x0D56
+	STENCIL_BITS                                 = 0x0D57
+	POLYGON_OFFSET_UNITS                         = 0x2A00
+	POLYGON_OFFSET_FACTOR                        = 0x8038
+	TEXTURE_BINDING_2D                           = 0x8069
+	SAMPLE_BUFFERS                               = 0x80A8
+	SAMPLES                                      = 0x80A9
+	SAMPLE_COVERAGE_VALUE                        = 0x80AA
+	SAMPLE_COVERAGE_INVERT                       = 0x80AB
+	NUM_COMPRESSED_TEXTURE_FORMATS               = 0x86A2
+	COMPRESSED_TEXTURE_FORMATS                   = 0x86A3
+	DONT_CARE                                    = 0x1100
+	FASTEST                                      = 0x1101
+	NICEST                                       = 0x1102
+	GENERATE_MIPMAP_HINT                         = 0x8192
+	BYTE                                         = 0x1400
+	UNSIGNED_BYTE                                = 0x1401
+	SHORT                                        = 0x1402
+	UNSIGNED_SHORT                               = 0x1403
+	INT                                          = 0x1404
+	UNSIGNED_INT                                 = 0x1405
+	FLOAT                                        = 0x1406
+	FIXED                                        = 0x140C
+	DEPTH_COMPONENT                              = 0x1902
+	ALPHA                                        = 0x1906
+	RGB                                          = 0x1907
+	RGBA                                         = 0x1908
+	LUMINANCE                                    = 0x1909
+	LUMINANCE_ALPHA                              = 0x190A
+	UNSIGNED_SHORT_4_4_4_4                       = 0x8033
+	UNSIGNED_SHORT_5_5_5_1                       = 0x8034
+	UNSIGNED_SHORT_5_6_5                         = 0x8363
+	MAX_VERTEX_ATTRIBS                           = 0x8869
+	MAX_VERTEX_UNIFORM_VECTORS                   = 0x8DFB
+	MAX_VARYING_VECTORS                          = 0x8DFC
+	MAX_COMBINED_TEXTURE_IMAGE_UNITS             = 0x8B4D
+	MAX_VERTEX_TEXTURE_IMAGE_UNITS               = 0x8B4C
+	MAX_TEXTURE_IMAGE_UNITS                      = 0x8872
+	MAX_FRAGMENT_UNIFORM_VECTORS                 = 0x8DFD
+	SHADER_TYPE                                  = 0x8B4F
+	DELETE_STATUS                                = 0x8B80
+	LINK_STATUS                                  = 0x8B82
+	VALIDATE_STATUS                              = 0x8B83
+	ATTACHED_SHADERS                             = 0x8B85
+	ACTIVE_UNIFORMS                              = 0x8B86
+	ACTIVE_UNIFORM_MAX_LENGTH                    = 0x8B87
+	ACTIVE_ATTRIBUTES                            = 0x8B89
+	ACTIVE_ATTRIBUTE_MAX_LENGTH                  = 0x8B8A
+	SHADING_LANGUAGE_VERSION                     = 0x8B8C
+	CURRENT_PROGRAM                              = 0x8B8D
+	NEVER                                        = 0x0200
+	LESS                                         = 0x0201
+	EQUAL                                        = 0x0202
+	LEQUAL                                       = 0x0203
+	GREATER                                      = 0x0204
+	NOTEQUAL                                     = 0x0205
+	GEQUAL                                       = 0x0206
+	ALWAYS                                       = 0x0207
+	KEEP                                         = 0x1E00
+	REPLACE                                      = 0x1E01
+	INCR                                         = 0x1E02
+	DECR                                         = 0x1E03
+	INVERT                                       = 0x150A
+	INCR_WRAP                                    = 0x8507
+	DECR_WRAP                                    = 0x8508
+	VENDOR                                       = 0x1F00
+	RENDERER                                     = 0x1F01
+	VERSION                                      = 0x1F02
+	EXTENSIONS                                   = 0x1F03
+	NEAREST                                      = 0x2600
+	LINEAR                                       = 0x2601
+	NEAREST_MIPMAP_NEAREST                       = 0x2700
+	LINEAR_MIPMAP_NEAREST                        = 0x2701
+	NEAREST_MIPMAP_LINEAR                        = 0x2702
+	LINEAR_MIPMAP_LINEAR                         = 0x2703
+	TEXTURE_MAG_FILTER                           = 0x2800
+	TEXTURE_MIN_FILTER                           = 0x2801
+	TEXTURE_WRAP_S                               = 0x2802
+	TEXTURE_WRAP_T                               = 0x2803
+	TEXTURE                                      = 0x1702
+	TEXTURE_CUBE_MAP                             = 0x8513
+	TEXTURE_BINDING_CUBE_MAP                     = 0x8514
+	TEXTURE_CUBE_MAP_POSITIVE_X                  = 0x8515
+	TEXTURE_CUBE_MAP_NEGATIVE_X                  = 0x8516
+	TEXTURE_CUBE_MAP_POSITIVE_Y                  = 0x8517
+	TEXTURE_CUBE_MAP_NEGATIVE_Y                  = 0x8518
+	TEXTURE_CUBE_MAP_POSITIVE_Z                  = 0x8519
+	TEXTURE_CUBE_MAP_NEGATIVE_Z                  = 0x851A
+	MAX_CUBE_MAP_TEXTURE_SIZE                    = 0x851C
+	TEXTURE0                                     = 0x84C0
+	TEXTURE1                                     = 0x84C1
+	TEXTURE2                                     = 0x84C2
+	TEXTURE3                                     = 0x84C3
+	TEXTURE4                                     = 0x84C4
+	TEXTURE5                                     = 0x84C5
+	TEXTURE6                                     = 0x84C6
+	TEXTURE7                                     = 0x84C7
+	TEXTURE8                                     = 0x84C8
+	TEXTURE9                                     = 0x84C9
+	TEXTURE10                                    = 0x84CA
+	TEXTURE11                                    = 0x84CB
+	TEXTURE12                                    = 0x84CC
+	TEXTURE13                                    = 0x84CD
+	TEXTURE14                                    = 0x84CE
+	TEXTURE15                                    = 0x84CF
+	TEXTURE16                                    = 0x84D0
+	TEXTURE17                                    = 0x84D1
+	TEXTURE18                                    = 0x84D2
+	TEXTURE19                                    = 0x84D3
+	TEXTURE20                                    = 0x84D4
+	TEXTURE21                                    = 0x84D5
+	TEXTURE22                                    = 0x84D6
+	TEXTURE23                                    = 0x84D7
+	TEXTURE24                                    = 0x84D8
+	TEXTURE25                                    = 0x84D9
+	TEXTURE26                                    = 0x84DA
+	TEXTURE27                                    = 0x84DB
+	TEXTURE28                                    = 0x84DC
+	TEXTURE29                                    = 0x84DD
+	TEXTURE30                                    = 0x84DE
+	TEXTURE31                                    = 0x84DF
+	ACTIVE_TEXTURE                               = 0x84E0
+	REPEAT                                       = 0x2901
+	CLAMP_TO_EDGE                                = 0x812F
+	MIRRORED_REPEAT                              = 0x8370
+	VERTEX_ATTRIB_ARRAY_ENABLED                  = 0x8622
+	VERTEX_ATTRIB_ARRAY_SIZE                     = 0x8623
+	VERTEX_ATTRIB_ARRAY_STRIDE                   = 0x8624
+	VERTEX_ATTRIB_ARRAY_TYPE                     = 0x8625
+	VERTEX_ATTRIB_ARRAY_NORMALIZED               = 0x886A
+	VERTEX_ATTRIB_ARRAY_POINTER                  = 0x8645
+	VERTEX_ATTRIB_ARRAY_BUFFER_BINDING           = 0x889F
+	IMPLEMENTATION_COLOR_READ_TYPE               = 0x8B9A
+	IMPLEMENTATION_COLOR_READ_FORMAT             = 0x8B9B
+	COMPILE_STATUS                               = 0x8B81
+	INFO_LOG_LENGTH                              = 0x8B84
+	SHADER_SOURCE_LENGTH                         = 0x8B88
+	SHADER_COMPILER                              = 0x8DFA
+	SHADER_BINARY_FORMATS                        = 0x8DF8
+	NUM_SHADER_BINARY_FORMATS                    = 0x8DF9
+	LOW_FLOAT                                    = 0x8DF0
+	MEDIUM_FLOAT                                 = 0x8DF1
+	HIGH_FLOAT                                   = 0x8DF2
+	LOW_INT                                      = 0x8DF3
+	MEDIUM_INT                                   = 0x8DF4
+	HIGH_INT                                     = 0x8DF5
+	FRAMEBUFFER                                  = 0x8D40
+	RENDERBUFFER                                 = 0x8D41
+	RGBA4                                        = 0x8056
+	RGB5_A1                                      = 0x8057
+	RGB565                                       = 0x8D62
+	DEPTH_COMPONENT16                            = 0x81A5
+	STENCIL_INDEX8                               = 0x8D48
+	RENDERBUFFER_WIDTH                           = 0x8D42
+	RENDERBUFFER_HEIGHT                          = 0x8D43
+	RENDERBUFFER_INTERNAL_FORMAT                 = 0x8D44
+	RENDERBUFFER_RED_SIZE                        = 0x8D50
+	RENDERBUFFER_GREEN_SIZE                      = 0x8D51
+	RENDERBUFFER_BLUE_SIZE                       = 0x8D52
+	RENDERBUFFER_ALPHA_SIZE                      = 0x8D53
+	RENDERBUFFER_DEPTH_SIZE                      = 0x8D54
+	RENDERBUFFER_STENCIL_SIZE                    = 0x8D55
+	FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE           = 0x8CD0
+	FRAMEBUFFER_ATTACHMENT_OBJECT_NAME           = 0x8CD1
+	FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL         = 0x8CD2
+	FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3
+	COLOR_ATTACHMENT0                            = 0x8CE0
+	DEPTH_ATTACHMENT                             = 0x8D00
+	STENCIL_ATTACHMENT                           = 0x8D20
+	FRAMEBUFFER_COMPLETE                         = 0x8CD5
+	FRAMEBUFFER_INCOMPLETE_ATTACHMENT            = 0x8CD6
+	FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT    = 0x8CD7
+	FRAMEBUFFER_INCOMPLETE_DIMENSIONS            = 0x8CD9
+	FRAMEBUFFER_UNSUPPORTED                      = 0x8CDD
+	FRAMEBUFFER_BINDING                          = 0x8CA6
+	RENDERBUFFER_BINDING                         = 0x8CA7
+	MAX_RENDERBUFFER_SIZE                        = 0x84E8
+	INVALID_FRAMEBUFFER_OPERATION                = 0x0506
+)
+
+const (
+	DEPTH_BUFFER_BIT   = 0x00000100
+	STENCIL_BUFFER_BIT = 0x00000400
+	COLOR_BUFFER_BIT   = 0x00004000
+)
+
+const (
+	FLOAT_VEC2   = 0x8B50
+	FLOAT_VEC3   = 0x8B51
+	FLOAT_VEC4   = 0x8B52
+	INT_VEC2     = 0x8B53
+	INT_VEC3     = 0x8B54
+	INT_VEC4     = 0x8B55
+	BOOL         = 0x8B56
+	BOOL_VEC2    = 0x8B57
+	BOOL_VEC3    = 0x8B58
+	BOOL_VEC4    = 0x8B59
+	FLOAT_MAT2   = 0x8B5A
+	FLOAT_MAT3   = 0x8B5B
+	FLOAT_MAT4   = 0x8B5C
+	SAMPLER_2D   = 0x8B5E
+	SAMPLER_CUBE = 0x8B60
+)
+
+const (
+	FRAGMENT_SHADER = 0x8B30
+	VERTEX_SHADER   = 0x8B31
+)
+
+const (
+	FALSE    = 0
+	TRUE     = 1
+	ZERO     = 0
+	ONE      = 1
+	NO_ERROR = 0
+	NONE     = 0
+)
+
+// GL ES 3.0 constants.
+const (
+	ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH          = 0x8A35
+	ACTIVE_UNIFORM_BLOCKS                         = 0x8A36
+	ALREADY_SIGNALED                              = 0x911A
+	ANY_SAMPLES_PASSED                            = 0x8C2F
+	ANY_SAMPLES_PASSED_CONSERVATIVE               = 0x8D6A
+	BLUE                                          = 0x1905
+	BUFFER_ACCESS_FLAGS                           = 0x911F
+	BUFFER_MAP_LENGTH                             = 0x9120
+	BUFFER_MAP_OFFSET                             = 0x9121
+	BUFFER_MAPPED                                 = 0x88BC
+	BUFFER_MAP_POINTER                            = 0x88BD
+	COLOR                                         = 0x1800
+	COLOR_ATTACHMENT10                            = 0x8CEA
+	COLOR_ATTACHMENT1                             = 0x8CE1
+	COLOR_ATTACHMENT11                            = 0x8CEB
+	COLOR_ATTACHMENT12                            = 0x8CEC
+	COLOR_ATTACHMENT13                            = 0x8CED
+	COLOR_ATTACHMENT14                            = 0x8CEE
+	COLOR_ATTACHMENT15                            = 0x8CEF
+	COLOR_ATTACHMENT2                             = 0x8CE2
+	COLOR_ATTACHMENT3                             = 0x8CE3
+	COLOR_ATTACHMENT4                             = 0x8CE4
+	COLOR_ATTACHMENT5                             = 0x8CE5
+	COLOR_ATTACHMENT6                             = 0x8CE6
+	COLOR_ATTACHMENT7                             = 0x8CE7
+	COLOR_ATTACHMENT8                             = 0x8CE8
+	COLOR_ATTACHMENT9                             = 0x8CE9
+	COMPARE_REF_TO_TEXTURE                        = 0x884E
+	COMPRESSED_R11_EAC                            = 0x9270
+	COMPRESSED_RG11_EAC                           = 0x9272
+	COMPRESSED_RGB8_ETC2                          = 0x9274
+	COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2      = 0x9276
+	COMPRESSED_RGBA8_ETC2_EAC                     = 0x9278
+	COMPRESSED_SIGNED_R11_EAC                     = 0x9271
+	COMPRESSED_SIGNED_RG11_EAC                    = 0x9273
+	COMPRESSED_SRGB8_ALPHA8_ETC2_EAC              = 0x9279
+	COMPRESSED_SRGB8_ETC2                         = 0x9275
+	COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2     = 0x9277
+	CONDITION_SATISFIED                           = 0x911C
+	COPY_READ_BUFFER                              = 0x8F36
+	COPY_READ_BUFFER_BINDING                      = 0x8F36
+	COPY_WRITE_BUFFER                             = 0x8F37
+	COPY_WRITE_BUFFER_BINDING                     = 0x8F37
+	CURRENT_QUERY                                 = 0x8865
+	DEPTH                                         = 0x1801
+	DEPTH24_STENCIL8                              = 0x88F0
+	DEPTH32F_STENCIL8                             = 0x8CAD
+	DEPTH_COMPONENT24                             = 0x81A6
+	DEPTH_COMPONENT32F                            = 0x8CAC
+	DEPTH_STENCIL                                 = 0x84F9
+	DEPTH_STENCIL_ATTACHMENT                      = 0x821A
+	DRAW_BUFFER0                                  = 0x8825
+	DRAW_BUFFER10                                 = 0x882F
+	DRAW_BUFFER1                                  = 0x8826
+	DRAW_BUFFER11                                 = 0x8830
+	DRAW_BUFFER12                                 = 0x8831
+	DRAW_BUFFER13                                 = 0x8832
+	DRAW_BUFFER14                                 = 0x8833
+	DRAW_BUFFER15                                 = 0x8834
+	DRAW_BUFFER2                                  = 0x8827
+	DRAW_BUFFER3                                  = 0x8828
+	DRAW_BUFFER4                                  = 0x8829
+	DRAW_BUFFER5                                  = 0x882A
+	DRAW_BUFFER6                                  = 0x882B
+	DRAW_BUFFER7                                  = 0x882C
+	DRAW_BUFFER8                                  = 0x882D
+	DRAW_BUFFER9                                  = 0x882E
+	DRAW_FRAMEBUFFER                              = 0x8CA9
+	DRAW_FRAMEBUFFER_BINDING                      = 0x8CA6
+	DYNAMIC_COPY                                  = 0x88EA
+	DYNAMIC_READ                                  = 0x88E9
+	FLOAT_32_UNSIGNED_INT_24_8_REV                = 0x8DAD
+	FLOAT_MAT2x3                                  = 0x8B65
+	FLOAT_MAT2x4                                  = 0x8B66
+	FLOAT_MAT3x2                                  = 0x8B67
+	FLOAT_MAT3x4                                  = 0x8B68
+	FLOAT_MAT4x2                                  = 0x8B69
+	FLOAT_MAT4x3                                  = 0x8B6A
+	FRAGMENT_SHADER_DERIVATIVE_HINT               = 0x8B8B
+	FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE             = 0x8215
+	FRAMEBUFFER_ATTACHMENT_BLUE_SIZE              = 0x8214
+	FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING         = 0x8210
+	FRAMEBUFFER_ATTACHMENT_COMPONENT_TYPE         = 0x8211
+	FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE             = 0x8216
+	FRAMEBUFFER_ATTACHMENT_GREEN_SIZE             = 0x8213
+	FRAMEBUFFER_ATTACHMENT_RED_SIZE               = 0x8212
+	FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE           = 0x8217
+	FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER          = 0x8CD4
+	FRAMEBUFFER_DEFAULT                           = 0x8218
+	FRAMEBUFFER_INCOMPLETE_MULTISAMPLE            = 0x8D56
+	FRAMEBUFFER_UNDEFINED                         = 0x8219
+	GREEN                                         = 0x1904
+	HALF_FLOAT                                    = 0x140B
+	INT_2_10_10_10_REV                            = 0x8D9F
+	INTERLEAVED_ATTRIBS                           = 0x8C8C
+	INT_SAMPLER_2D                                = 0x8DCA
+	INT_SAMPLER_2D_ARRAY                          = 0x8DCF
+	INT_SAMPLER_3D                                = 0x8DCB
+	INT_SAMPLER_CUBE                              = 0x8DCC
+	INVALID_INDEX                                 = 0xFFFFFFFF
+	MAJOR_VERSION                                 = 0x821B
+	MAP_FLUSH_EXPLICIT_BIT                        = 0x0010
+	MAP_INVALIDATE_BUFFER_BIT                     = 0x0008
+	MAP_INVALIDATE_RANGE_BIT                      = 0x0004
+	MAP_READ_BIT                                  = 0x0001
+	MAP_UNSYNCHRONIZED_BIT                        = 0x0020
+	MAP_WRITE_BIT                                 = 0x0002
+	MAX                                           = 0x8008
+	MAX_3D_TEXTURE_SIZE                           = 0x8073
+	MAX_ARRAY_TEXTURE_LAYERS                      = 0x88FF
+	MAX_COLOR_ATTACHMENTS                         = 0x8CDF
+	MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS      = 0x8A33
+	MAX_COMBINED_UNIFORM_BLOCKS                   = 0x8A2E
+	MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS        = 0x8A31
+	MAX_DRAW_BUFFERS                              = 0x8824
+	MAX_ELEMENT_INDEX                             = 0x8D6B
+	MAX_ELEMENTS_INDICES                          = 0x80E9
+	MAX_ELEMENTS_VERTICES                         = 0x80E8
+	MAX_FRAGMENT_INPUT_COMPONENTS                 = 0x9125
+	MAX_FRAGMENT_UNIFORM_BLOCKS                   = 0x8A2D
+	MAX_FRAGMENT_UNIFORM_COMPONENTS               = 0x8B49
+	MAX_PROGRAM_TEXEL_OFFSET                      = 0x8905
+	MAX_SAMPLES                                   = 0x8D57
+	MAX_SERVER_WAIT_TIMEOUT                       = 0x9111
+	MAX_TEXTURE_LOD_BIAS                          = 0x84FD
+	MAX_TRANSFORM_FEEDBACK_INTERLEAVED_COMPONENTS = 0x8C8A
+	MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS       = 0x8C8B
+	MAX_TRANSFORM_FEEDBACK_SEPARATE_COMPONENTS    = 0x8C80
+	MAX_UNIFORM_BLOCK_SIZE                        = 0x8A30
+	MAX_UNIFORM_BUFFER_BINDINGS                   = 0x8A2F
+	MAX_VARYING_COMPONENTS                        = 0x8B4B
+	MAX_VERTEX_OUTPUT_COMPONENTS                  = 0x9122
+	MAX_VERTEX_UNIFORM_BLOCKS                     = 0x8A2B
+	MAX_VERTEX_UNIFORM_COMPONENTS                 = 0x8B4A
+	MIN                                           = 0x8007
+	MINOR_VERSION                                 = 0x821C
+	MIN_PROGRAM_TEXEL_OFFSET                      = 0x8904
+	NUM_EXTENSIONS                                = 0x821D
+	NUM_PROGRAM_BINARY_FORMATS                    = 0x87FE
+	NUM_SAMPLE_COUNTS                             = 0x9380
+	OBJECT_TYPE                                   = 0x9112
+	PACK_ROW_LENGTH                               = 0x0D02
+	PACK_SKIP_PIXELS                              = 0x0D04
+	PACK_SKIP_ROWS                                = 0x0D03
+	PIXEL_PACK_BUFFER                             = 0x88EB
+	PIXEL_PACK_BUFFER_BINDING                     = 0x88ED
+	PIXEL_UNPACK_BUFFER                           = 0x88EC
+	PIXEL_UNPACK_BUFFER_BINDING                   = 0x88EF
+	PRIMITIVE_RESTART_FIXED_INDEX                 = 0x8D69
+	PROGRAM_BINARY_FORMATS                        = 0x87FF
+	PROGRAM_BINARY_LENGTH                         = 0x8741
+	PROGRAM_BINARY_RETRIEVABLE_HINT               = 0x8257
+	QUERY_RESULT                                  = 0x8866
+	QUERY_RESULT_AVAILABLE                        = 0x8867
+	R11F_G11F_B10F                                = 0x8C3A
+	R16F                                          = 0x822D
+	R16I                                          = 0x8233
+	R16UI                                         = 0x8234
+	R32F                                          = 0x822E
+	R32I                                          = 0x8235
+	R32UI                                         = 0x8236
+	R8                                            = 0x8229
+	R8I                                           = 0x8231
+	R8_SNORM                                      = 0x8F94
+	R8UI                                          = 0x8232
+	RASTERIZER_DISCARD                            = 0x8C89
+	READ_BUFFER                                   = 0x0C02
+	READ_FRAMEBUFFER                              = 0x8CA8
+	READ_FRAMEBUFFER_BINDING                      = 0x8CAA
+	RED                                           = 0x1903
+	RED_INTEGER                                   = 0x8D94
+	RENDERBUFFER_SAMPLES                          = 0x8CAB
+	RG                                            = 0x8227
+	RG16F                                         = 0x822F
+	RG16I                                         = 0x8239
+	RG16UI                                        = 0x823A
+	RG32F                                         = 0x8230
+	RG32I                                         = 0x823B
+	RG32UI                                        = 0x823C
+	RG8                                           = 0x822B
+	RG8I                                          = 0x8237
+	RG8_SNORM                                     = 0x8F95
+	RG8UI                                         = 0x8238
+	RGB10_A2                                      = 0x8059
+	RGB10_A2UI                                    = 0x906F
+	RGB16F                                        = 0x881B
+	RGB16I                                        = 0x8D89
+	RGB16UI                                       = 0x8D77
+	RGB32F                                        = 0x8815
+	RGB32I                                        = 0x8D83
+	RGB32UI                                       = 0x8D71
+	RGB8                                          = 0x8051
+	RGB8I                                         = 0x8D8F
+	RGB8_SNORM                                    = 0x8F96
+	RGB8UI                                        = 0x8D7D
+	RGB9_E5                                       = 0x8C3D
+	RGBA16F                                       = 0x881A
+	RGBA16I                                       = 0x8D88
+	RGBA16UI                                      = 0x8D76
+	RGBA32F                                       = 0x8814
+	RGBA32I                                       = 0x8D82
+	RGBA32UI                                      = 0x8D70
+	RGBA8                                         = 0x8058
+	RGBA8I                                        = 0x8D8E
+	RGBA8_SNORM                                   = 0x8F97
+	RGBA8UI                                       = 0x8D7C
+	RGBA_INTEGER                                  = 0x8D99
+	RGB_INTEGER                                   = 0x8D98
+	RG_INTEGER                                    = 0x8228
+	SAMPLER_2D_ARRAY                              = 0x8DC1
+	SAMPLER_2D_ARRAY_SHADOW                       = 0x8DC4
+	SAMPLER_2D_SHADOW                             = 0x8B62
+	SAMPLER_3D                                    = 0x8B5F
+	SAMPLER_BINDING                               = 0x8919
+	SAMPLER_CUBE_SHADOW                           = 0x8DC5
+	SEPARATE_ATTRIBS                              = 0x8C8D
+	SIGNALED                                      = 0x9119
+	SIGNED_NORMALIZED                             = 0x8F9C
+	SRGB                                          = 0x8C40
+	SRGB8                                         = 0x8C41
+	SRGB8_ALPHA8                                  = 0x8C43
+	STATIC_COPY                                   = 0x88E6
+	STATIC_READ                                   = 0x88E5
+	STENCIL                                       = 0x1802
+	STREAM_COPY                                   = 0x88E2
+	STREAM_READ                                   = 0x88E1
+	SYNC_CONDITION                                = 0x9113
+	SYNC_FENCE                                    = 0x9116
+	SYNC_FLAGS                                    = 0x9115
+	SYNC_FLUSH_COMMANDS_BIT                       = 0x00000001
+	SYNC_GPU_COMMANDS_COMPLETE                    = 0x9117
+	SYNC_STATUS                                   = 0x9114
+	TEXTURE_2D_ARRAY                              = 0x8C1A
+	TEXTURE_3D                                    = 0x806F
+	TEXTURE_BASE_LEVEL                            = 0x813C
+	TEXTURE_BINDING_2D_ARRAY                      = 0x8C1D
+	TEXTURE_BINDING_3D                            = 0x806A
+	TEXTURE_COMPARE_FUNC                          = 0x884D
+	TEXTURE_COMPARE_MODE                          = 0x884C
+	TEXTURE_IMMUTABLE_FORMAT                      = 0x912F
+	TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF
+	TEXTURE_MAX_LEVEL                             = 0x813D
+	TEXTURE_MAX_LOD                               = 0x813B
+	TEXTURE_MIN_LOD                               = 0x813A
+	TEXTURE_SWIZZLE_A                             = 0x8E45
+	TEXTURE_SWIZZLE_B                             = 0x8E44
+	TEXTURE_SWIZZLE_G                             = 0x8E43
+	TEXTURE_SWIZZLE_R                             = 0x8E42
+	TEXTURE_WRAP_R                                = 0x8072
+	TIMEOUT_EXPIRED                               = 0x911B
+	TIMEOUT_IGNORED                               = 0xFFFFFFFFFFFFFFFF
+	TRANSFORM_FEEDBACK                            = 0x8E22
+	TRANSFORM_FEEDBACK_ACTIVE                     = 0x8E24
+	TRANSFORM_FEEDBACK_BINDING                    = 0x8E25
+	TRANSFORM_FEEDBACK_BUFFER                     = 0x8C8E
+	TRANSFORM_FEEDBACK_BUFFER_BINDING             = 0x8C8F
+	TRANSFORM_FEEDBACK_BUFFER_MODE                = 0x8C7F
+	TRANSFORM_FEEDBACK_BUFFER_SIZE                = 0x8C85
+	TRANSFORM_FEEDBACK_BUFFER_START               = 0x8C84
+	TRANSFORM_FEEDBACK_PAUSED                     = 0x8E23
+	TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN         = 0x8C88
+	TRANSFORM_FEEDBACK_VARYING_MAX_LENGTH         = 0x8C76
+	TRANSFORM_FEEDBACK_VARYINGS                   = 0x8C83
+	UNIFORM_ARRAY_STRIDE                          = 0x8A3C
+	UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES          = 0x8A43
+	UNIFORM_BLOCK_ACTIVE_UNIFORMS                 = 0x8A42
+	UNIFORM_BLOCK_BINDING                         = 0x8A3F
+	UNIFORM_BLOCK_DATA_SIZE                       = 0x8A40
+	UNIFORM_BLOCK_INDEX                           = 0x8A3A
+	UNIFORM_BLOCK_NAME_LENGTH                     = 0x8A41
+	UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER   = 0x8A46
+	UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER     = 0x8A44
+	UNIFORM_BUFFER                                = 0x8A11
+	UNIFORM_BUFFER_BINDING                        = 0x8A28
+	UNIFORM_BUFFER_OFFSET_ALIGNMENT               = 0x8A34
+	UNIFORM_BUFFER_SIZE                           = 0x8A2A
+	UNIFORM_BUFFER_START                          = 0x8A29
+	UNIFORM_IS_ROW_MAJOR                          = 0x8A3E
+	UNIFORM_MATRIX_STRIDE                         = 0x8A3D
+	UNIFORM_NAME_LENGTH                           = 0x8A39
+	UNIFORM_OFFSET                                = 0x8A3B
+	UNIFORM_SIZE                                  = 0x8A38
+	UNIFORM_TYPE                                  = 0x8A37
+	UNPACK_IMAGE_HEIGHT                           = 0x806E
+	UNPACK_ROW_LENGTH                             = 0x0CF2
+	UNPACK_SKIP_IMAGES                            = 0x806D
+	UNPACK_SKIP_PIXELS                            = 0x0CF4
+	UNPACK_SKIP_ROWS                              = 0x0CF3
+	UNSIGNALED                                    = 0x9118
+	UNSIGNED_INT_10F_11F_11F_REV                  = 0x8C3B
+	UNSIGNED_INT_2_10_10_10_REV                   = 0x8368
+	UNSIGNED_INT_24_8                             = 0x84FA
+	UNSIGNED_INT_5_9_9_9_REV                      = 0x8C3E
+	UNSIGNED_INT_SAMPLER_2D                       = 0x8DD2
+	UNSIGNED_INT_SAMPLER_2D_ARRAY                 = 0x8DD7
+	UNSIGNED_INT_SAMPLER_3D                       = 0x8DD3
+	UNSIGNED_INT_SAMPLER_CUBE                     = 0x8DD4
+	UNSIGNED_INT_VEC2                             = 0x8DC6
+	UNSIGNED_INT_VEC3                             = 0x8DC7
+	UNSIGNED_INT_VEC4                             = 0x8DC8
+	UNSIGNED_NORMALIZED                           = 0x8C17
+	VERTEX_ARRAY_BINDING                          = 0x85B5
+	VERTEX_ATTRIB_ARRAY_DIVISOR                   = 0x88FE
+	VERTEX_ATTRIB_ARRAY_INTEGER                   = 0x88FD
+	WAIT_FAILED                                   = 0x911D
+)

vendor/github.com/ebitengine/gomobile/gl/dll_windows.go

@@ -0,0 +1,243 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"debug/pe"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"runtime"
+)
+
+var debug = log.New(ioutil.Discard, "gl: ", log.LstdFlags)
+
+func downloadDLLs() (path string, err error) {
+	url := "https://dl.google.com/go/mobile/angle-bd3f8780b-" + runtime.GOARCH + ".tgz"
+	debug.Printf("downloading %s", url)
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", fmt.Errorf("gl: %v", err)
+	}
+	defer func() {
+		err2 := resp.Body.Close()
+		if err == nil && err2 != nil {
+			err = fmt.Errorf("gl: error reading body from %v: %v", url, err2)
+		}
+	}()
+	if resp.StatusCode != http.StatusOK {
+		err := fmt.Errorf("gl: error fetching %v, status: %v", url, resp.Status)
+		return "", err
+	}
+
+	r, err := gzip.NewReader(resp.Body)
+	if err != nil {
+		return "", fmt.Errorf("gl: error reading gzip from %v: %v", url, err)
+	}
+	tr := tar.NewReader(r)
+	var bytesGLESv2, bytesEGL, bytesD3DCompiler []byte
+	for {
+		header, err := tr.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return "", fmt.Errorf("gl: error reading tar from %v: %v", url, err)
+		}
+		switch header.Name {
+		case "angle-" + runtime.GOARCH + "/libglesv2.dll":
+			bytesGLESv2, err = ioutil.ReadAll(tr)
+		case "angle-" + runtime.GOARCH + "/libegl.dll":
+			bytesEGL, err = ioutil.ReadAll(tr)
+		case "angle-" + runtime.GOARCH + "/d3dcompiler_47.dll":
+			bytesD3DCompiler, err = ioutil.ReadAll(tr)
+		default: // skip
+		}
+		if err != nil {
+			return "", fmt.Errorf("gl: error reading %v from %v: %v", header.Name, url, err)
+		}
+	}
+	if len(bytesGLESv2) == 0 || len(bytesEGL) == 0 || len(bytesD3DCompiler) == 0 {
+		return "", fmt.Errorf("gl: did not find all DLLs in %v", url)
+	}
+
+	writeDLLs := func(path string) error {
+		if err := ioutil.WriteFile(filepath.Join(path, "libglesv2.dll"), bytesGLESv2, 0755); err != nil {
+			return fmt.Errorf("gl: cannot install ANGLE: %v", err)
+		}
+		if err := ioutil.WriteFile(filepath.Join(path, "libegl.dll"), bytesEGL, 0755); err != nil {
+			return fmt.Errorf("gl: cannot install ANGLE: %v", err)
+		}
+		if err := ioutil.WriteFile(filepath.Join(path, "d3dcompiler_47.dll"), bytesD3DCompiler, 0755); err != nil {
+			return fmt.Errorf("gl: cannot install ANGLE: %v", err)
+		}
+		return nil
+	}
+
+	// First, we attempt to install these DLLs in LOCALAPPDATA/Shiny.
+	//
+	// Traditionally we would use the system32 directory, but it is
+	// no longer writable by normal programs.
+	os.MkdirAll(appdataPath(), 0775)
+	if err := writeDLLs(appdataPath()); err == nil {
+		return appdataPath(), nil
+	}
+	debug.Printf("DLLs could not be written to %s", appdataPath())
+
+	// Second, install in GOPATH/pkg if it exists.
+	gopath := os.Getenv("GOPATH")
+	gopathpkg := filepath.Join(gopath, "pkg")
+	if _, err := os.Stat(gopathpkg); err == nil && gopath != "" {
+		if err := writeDLLs(gopathpkg); err == nil {
+			return gopathpkg, nil
+		}
+	}
+	debug.Printf("DLLs could not be written to GOPATH")
+
+	// Third, pick a temporary directory.
+	tmp := os.TempDir()
+	if err := writeDLLs(tmp); err != nil {
+		return "", fmt.Errorf("gl: unable to install ANGLE DLLs: %v", err)
+	}
+	return tmp, nil
+}
+
+func appdataPath() string {
+	return filepath.Join(os.Getenv("LOCALAPPDATA"), "GoGL", runtime.GOARCH)
+}
+
+func containsDLLs(dir string) bool {
+	compatible := func(name string) bool {
+		file, err := pe.Open(filepath.Join(dir, name))
+		if err != nil {
+			return false
+		}
+		defer file.Close()
+
+		switch file.Machine {
+		case pe.IMAGE_FILE_MACHINE_AMD64:
+			return "amd64" == runtime.GOARCH
+		case pe.IMAGE_FILE_MACHINE_ARM:
+			return "arm" == runtime.GOARCH
+		case pe.IMAGE_FILE_MACHINE_I386:
+			return "386" == runtime.GOARCH
+		}
+		return false
+	}
+
+	return compatible("libglesv2.dll") && compatible("libegl.dll") && compatible("d3dcompiler_47.dll")
+}
+
+func chromePath() string {
+	// dlls are stored in:
+	//   <BASE>/<VERSION>/libglesv2.dll
+
+	var installdirs = []string{
+		// Chrome User
+		filepath.Join(os.Getenv("LOCALAPPDATA"), "Google", "Chrome", "Application"),
+		// Chrome System
+		filepath.Join(os.Getenv("ProgramFiles(x86)"), "Google", "Chrome", "Application"),
+		// Chromium
+		filepath.Join(os.Getenv("LOCALAPPDATA"), "Chromium", "Application"),
+		// Chrome Canary
+		filepath.Join(os.Getenv("LOCALAPPDATA"), "Google", "Chrome SxS", "Application"),
+	}
+
+	for _, installdir := range installdirs {
+		versiondirs, err := ioutil.ReadDir(installdir)
+		if err != nil {
+			continue
+		}
+
+		for _, versiondir := range versiondirs {
+			if !versiondir.IsDir() {
+				continue
+			}
+
+			versionpath := filepath.Join(installdir, versiondir.Name())
+			if containsDLLs(versionpath) {
+				return versionpath
+			}
+		}
+	}
+
+	return ""
+}
+
+func findDLLs() (err error) {
+	load := func(path string) (bool, error) {
+		if path != "" {
+			// don't try to start when one of the files is missing
+			if !containsDLLs(path) {
+				return false, nil
+			}
+
+			LibD3DCompiler.Name = filepath.Join(path, filepath.Base(LibD3DCompiler.Name))
+			LibGLESv2.Name = filepath.Join(path, filepath.Base(LibGLESv2.Name))
+			LibEGL.Name = filepath.Join(path, filepath.Base(LibEGL.Name))
+		}
+
+		if err := LibGLESv2.Load(); err == nil {
+			if err := LibEGL.Load(); err != nil {
+				return false, fmt.Errorf("gl: loaded libglesv2 but not libegl: %v", err)
+			}
+			if err := LibD3DCompiler.Load(); err != nil {
+				return false, fmt.Errorf("gl: loaded libglesv2, libegl but not d3dcompiler: %v", err)
+			}
+			if path == "" {
+				debug.Printf("DLLs found")
+			} else {
+				debug.Printf("DLLs found in: %q", path)
+			}
+			return true, nil
+		}
+
+		return false, nil
+	}
+
+	// Look in the system directory.
+	if ok, err := load(""); ok || err != nil {
+		return err
+	}
+
+	// Look in the AppData directory.
+	if ok, err := load(appdataPath()); ok || err != nil {
+		return err
+	}
+
+	// Look for a Chrome installation
+	if dir := chromePath(); dir != "" {
+		if ok, err := load(dir); ok || err != nil {
+			return err
+		}
+	}
+
+	// Look in GOPATH/pkg.
+	if ok, err := load(filepath.Join(os.Getenv("GOPATH"), "pkg")); ok || err != nil {
+		return err
+	}
+
+	// Look in temporary directory.
+	if ok, err := load(os.TempDir()); ok || err != nil {
+		return err
+	}
+
+	// Download the DLL binary.
+	path, err := downloadDLLs()
+	if err != nil {
+		return err
+	}
+	debug.Printf("DLLs written to %s", path)
+	if ok, err := load(path); !ok || err != nil {
+		return fmt.Errorf("gl: unable to load ANGLE after installation: %v", err)
+	}
+	return nil
+}

vendor/github.com/ebitengine/gomobile/gl/doc.go

@@ -0,0 +1,66 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package gl implements Go bindings for OpenGL ES 2.0 and ES 3.0.
+
+The GL functions are defined on a Context object that is responsible for
+tracking a GL context. Typically a windowing system package (such as
+golang.org/x/exp/shiny/screen) will call NewContext and provide
+a gl.Context for a user application.
+
+If the gl package is compiled on a platform capable of supporting ES 3.0,
+the gl.Context object also implements gl.Context3.
+
+The bindings are deliberately minimal, staying as close the C API as
+possible. The semantics of each function maps onto functions
+described in the Khronos documentation:
+
+https://www.khronos.org/opengles/sdk/docs/man/
+
+One notable departure from the C API is the introduction of types
+to represent common uses of GLint: Texture, Surface, Buffer, etc.
+
+# Debug Logging
+
+A tracing version of the OpenGL bindings is behind the `gldebug` build
+tag. It acts as a simplified version of apitrace. Build your Go binary
+with
+
+	-tags gldebug
+
+and each call to a GL function will log its input, output, and any
+error messages. For example,
+
+	I/GoLog   (27668): gl.GenBuffers(1) [Buffer(70001)]
+	I/GoLog   (27668): gl.BindBuffer(ARRAY_BUFFER, Buffer(70001))
+	I/GoLog   (27668): gl.BufferData(ARRAY_BUFFER, 36, len(36), STATIC_DRAW)
+	I/GoLog   (27668): gl.BindBuffer(ARRAY_BUFFER, Buffer(70001))
+	I/GoLog   (27668): gl.VertexAttribPointer(Attrib(0), 6, FLOAT, false, 0, 0)  error: [INVALID_VALUE]
+
+The gldebug tracing has very high overhead, so make sure to remove
+the build tag before deploying any binaries.
+*/
+package gl // import "github.com/ebitengine/gomobile/gl"
+
+/*
+Implementation details.
+
+All GL function calls fill out a C.struct_fnargs and drop it on the work
+queue. The Start function drains the work queue and hands over a batch
+of calls to C.process which runs them. This allows multiple GL calls to
+be executed in a single cgo call.
+
+A GL call is marked as blocking if it returns a value, or if it takes a
+Go pointer. In this case the call will not return until C.process sends a
+value on the retvalue channel.
+
+This implementation ensures any goroutine can make GL calls, but it does
+not make the GL interface safe for simultaneous use by multiple goroutines.
+For the purpose of analyzing this code for race conditions, picture two
+separate goroutines: one blocked on gl.Start, and another making calls to
+the gl package exported functions.
+*/
+
+//go:generate go run gendebug.go -o gldebug.go

vendor/github.com/ebitengine/gomobile/gl/fn.go

@@ -0,0 +1,210 @@
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+import "unsafe"
+
+type call struct {
+	args     fnargs
+	parg     unsafe.Pointer
+	blocking bool
+}
+
+type fnargs struct {
+	fn glfn
+
+	a0 uintptr
+	a1 uintptr
+	a2 uintptr
+	a3 uintptr
+	a4 uintptr
+	a5 uintptr
+	a6 uintptr
+	a7 uintptr
+	a8 uintptr
+	a9 uintptr
+}
+
+type glfn int
+
+const (
+	glfnUNDEFINED glfn = iota
+	glfnActiveTexture
+	glfnAttachShader
+	glfnBindAttribLocation
+	glfnBindBuffer
+	glfnBindFramebuffer
+	glfnBindRenderbuffer
+	glfnBindTexture
+	glfnBindVertexArray
+	glfnBlendColor
+	glfnBlendEquation
+	glfnBlendEquationSeparate
+	glfnBlendFunc
+	glfnBlendFuncSeparate
+	glfnBufferData
+	glfnBufferSubData
+	glfnCheckFramebufferStatus
+	glfnClear
+	glfnClearColor
+	glfnClearDepthf
+	glfnClearStencil
+	glfnColorMask
+	glfnCompileShader
+	glfnCompressedTexImage2D
+	glfnCompressedTexSubImage2D
+	glfnCopyTexImage2D
+	glfnCopyTexSubImage2D
+	glfnCreateProgram
+	glfnCreateShader
+	glfnCullFace
+	glfnDeleteBuffer
+	glfnDeleteFramebuffer
+	glfnDeleteProgram
+	glfnDeleteRenderbuffer
+	glfnDeleteShader
+	glfnDeleteTexture
+	glfnDeleteVertexArray
+	glfnDepthFunc
+	glfnDepthRangef
+	glfnDepthMask
+	glfnDetachShader
+	glfnDisable
+	glfnDisableVertexAttribArray
+	glfnDrawArrays
+	glfnDrawElements
+	glfnEnable
+	glfnEnableVertexAttribArray
+	glfnFinish
+	glfnFlush
+	glfnFramebufferRenderbuffer
+	glfnFramebufferTexture2D
+	glfnFrontFace
+	glfnGenBuffer
+	glfnGenFramebuffer
+	glfnGenRenderbuffer
+	glfnGenTexture
+	glfnGenVertexArray
+	glfnGenerateMipmap
+	glfnGetActiveAttrib
+	glfnGetActiveUniform
+	glfnGetAttachedShaders
+	glfnGetAttribLocation
+	glfnGetBooleanv
+	glfnGetBufferParameteri
+	glfnGetError
+	glfnGetFloatv
+	glfnGetFramebufferAttachmentParameteriv
+	glfnGetIntegerv
+	glfnGetProgramInfoLog
+	glfnGetProgramiv
+	glfnGetRenderbufferParameteriv
+	glfnGetShaderInfoLog
+	glfnGetShaderPrecisionFormat
+	glfnGetShaderSource
+	glfnGetShaderiv
+	glfnGetString
+	glfnGetTexParameterfv
+	glfnGetTexParameteriv
+	glfnGetUniformLocation
+	glfnGetUniformfv
+	glfnGetUniformiv
+	glfnGetVertexAttribfv
+	glfnGetVertexAttribiv
+	glfnHint
+	glfnIsBuffer
+	glfnIsEnabled
+	glfnIsFramebuffer
+	glfnIsProgram
+	glfnIsRenderbuffer
+	glfnIsShader
+	glfnIsTexture
+	glfnLineWidth
+	glfnLinkProgram
+	glfnPixelStorei
+	glfnPolygonOffset
+	glfnReadPixels
+	glfnReleaseShaderCompiler
+	glfnRenderbufferStorage
+	glfnSampleCoverage
+	glfnScissor
+	glfnShaderSource
+	glfnStencilFunc
+	glfnStencilFuncSeparate
+	glfnStencilMask
+	glfnStencilMaskSeparate
+	glfnStencilOp
+	glfnStencilOpSeparate
+	glfnTexImage2D
+	glfnTexParameterf
+	glfnTexParameterfv
+	glfnTexParameteri
+	glfnTexParameteriv
+	glfnTexSubImage2D
+	glfnUniform1f
+	glfnUniform1fv
+	glfnUniform1i
+	glfnUniform1iv
+	glfnUniform2f
+	glfnUniform2fv
+	glfnUniform2i
+	glfnUniform2iv
+	glfnUniform3f
+	glfnUniform3fv
+	glfnUniform3i
+	glfnUniform3iv
+	glfnUniform4f
+	glfnUniform4fv
+	glfnUniform4i
+	glfnUniform4iv
+	glfnUniformMatrix2fv
+	glfnUniformMatrix3fv
+	glfnUniformMatrix4fv
+	glfnUseProgram
+	glfnValidateProgram
+	glfnVertexAttrib1f
+	glfnVertexAttrib1fv
+	glfnVertexAttrib2f
+	glfnVertexAttrib2fv
+	glfnVertexAttrib3f
+	glfnVertexAttrib3fv
+	glfnVertexAttrib4f
+	glfnVertexAttrib4fv
+	glfnVertexAttribPointer
+	glfnViewport
+
+	// ES 3.0 functions
+	glfnUniformMatrix2x3fv
+	glfnUniformMatrix3x2fv
+	glfnUniformMatrix2x4fv
+	glfnUniformMatrix4x2fv
+	glfnUniformMatrix3x4fv
+	glfnUniformMatrix4x3fv
+	glfnBlitFramebuffer
+	glfnUniform1ui
+	glfnUniform2ui
+	glfnUniform3ui
+	glfnUniform4ui
+	glfnUniform1uiv
+	glfnUniform2uiv
+	glfnUniform3uiv
+	glfnUniform4uiv
+)
+
+func goString(buf []byte) string {
+	for i, b := range buf {
+		if b == 0 {
+			return string(buf[:i])
+		}
+	}
+	panic("buf is not NUL-terminated")
+}
+
+func glBoolean(b bool) uintptr {
+	if b {
+		return TRUE
+	}
+	return FALSE
+}

vendor/github.com/ebitengine/gomobile/gl/interface.go

@@ -0,0 +1,889 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+// Context is an OpenGL ES context.
+//
+// A Context has a method for every GL function supported by ES 2 or later.
+// In a program compiled with ES 3 support, a Context is also a Context3.
+// For example, a program can:
+//
+//	func f(glctx gl.Context) {
+//		glctx.(gl.Context3).BlitFramebuffer(...)
+//	}
+//
+// Calls are not safe for concurrent use. However calls can be made from
+// any goroutine, the gl package removes the notion of thread-local
+// context.
+//
+// Contexts are independent. Two contexts can be used concurrently.
+type Context interface {
+	// ActiveTexture sets the active texture unit.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glActiveTexture.xhtml
+	ActiveTexture(texture Enum)
+
+	// AttachShader attaches a shader to a program.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glAttachShader.xhtml
+	AttachShader(p Program, s Shader)
+
+	// BindAttribLocation binds a vertex attribute index with a named
+	// variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindAttribLocation.xhtml
+	BindAttribLocation(p Program, a Attrib, name string)
+
+	// BindBuffer binds a buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindBuffer.xhtml
+	BindBuffer(target Enum, b Buffer)
+
+	// BindFramebuffer binds a framebuffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindFramebuffer.xhtml
+	BindFramebuffer(target Enum, fb Framebuffer)
+
+	// BindRenderbuffer binds a render buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindRenderbuffer.xhtml
+	BindRenderbuffer(target Enum, rb Renderbuffer)
+
+	// BindTexture binds a texture.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindTexture.xhtml
+	BindTexture(target Enum, t Texture)
+
+	// BindVertexArray binds a vertex array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBindVertexArray.xhtml
+	BindVertexArray(rb VertexArray)
+
+	// BlendColor sets the blend color.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBlendColor.xhtml
+	BlendColor(red, green, blue, alpha float32)
+
+	// BlendEquation sets both RGB and alpha blend equations.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBlendEquation.xhtml
+	BlendEquation(mode Enum)
+
+	// BlendEquationSeparate sets RGB and alpha blend equations separately.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBlendEquationSeparate.xhtml
+	BlendEquationSeparate(modeRGB, modeAlpha Enum)
+
+	// BlendFunc sets the pixel blending factors.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBlendFunc.xhtml
+	BlendFunc(sfactor, dfactor Enum)
+
+	// BlendFunc sets the pixel RGB and alpha blending factors separately.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBlendFuncSeparate.xhtml
+	BlendFuncSeparate(sfactorRGB, dfactorRGB, sfactorAlpha, dfactorAlpha Enum)
+
+	// BufferData creates a new data store for the bound buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBufferData.xhtml
+	BufferData(target Enum, src []byte, usage Enum)
+
+	// BufferInit creates a new uninitialized data store for the bound buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBufferData.xhtml
+	BufferInit(target Enum, size int, usage Enum)
+
+	// BufferSubData sets some of data in the bound buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glBufferSubData.xhtml
+	BufferSubData(target Enum, offset int, data []byte)
+
+	// CheckFramebufferStatus reports the completeness status of the
+	// active framebuffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCheckFramebufferStatus.xhtml
+	CheckFramebufferStatus(target Enum) Enum
+
+	// Clear clears the window.
+	//
+	// The behavior of Clear is influenced by the pixel ownership test,
+	// the scissor test, dithering, and the buffer writemasks.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glClear.xhtml
+	Clear(mask Enum)
+
+	// ClearColor specifies the RGBA values used to clear color buffers.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glClearColor.xhtml
+	ClearColor(red, green, blue, alpha float32)
+
+	// ClearDepthf sets the depth value used to clear the depth buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glClearDepthf.xhtml
+	ClearDepthf(d float32)
+
+	// ClearStencil sets the index used to clear the stencil buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glClearStencil.xhtml
+	ClearStencil(s int)
+
+	// ColorMask specifies whether color components in the framebuffer
+	// can be written.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glColorMask.xhtml
+	ColorMask(red, green, blue, alpha bool)
+
+	// CompileShader compiles the source code of s.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCompileShader.xhtml
+	CompileShader(s Shader)
+
+	// CompressedTexImage2D writes a compressed 2D texture.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCompressedTexImage2D.xhtml
+	CompressedTexImage2D(target Enum, level int, internalformat Enum, width, height, border int, data []byte)
+
+	// CompressedTexSubImage2D writes a subregion of a compressed 2D texture.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCompressedTexSubImage2D.xhtml
+	CompressedTexSubImage2D(target Enum, level, xoffset, yoffset, width, height int, format Enum, data []byte)
+
+	// CopyTexImage2D writes a 2D texture from the current framebuffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCopyTexImage2D.xhtml
+	CopyTexImage2D(target Enum, level int, internalformat Enum, x, y, width, height, border int)
+
+	// CopyTexSubImage2D writes a 2D texture subregion from the
+	// current framebuffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCopyTexSubImage2D.xhtml
+	CopyTexSubImage2D(target Enum, level, xoffset, yoffset, x, y, width, height int)
+
+	// CreateBuffer creates a buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenBuffers.xhtml
+	CreateBuffer() Buffer
+
+	// CreateFramebuffer creates a framebuffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenFramebuffers.xhtml
+	CreateFramebuffer() Framebuffer
+
+	// CreateProgram creates a new empty program object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCreateProgram.xhtml
+	CreateProgram() Program
+
+	// CreateRenderbuffer create a renderbuffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenRenderbuffers.xhtml
+	CreateRenderbuffer() Renderbuffer
+
+	// CreateShader creates a new empty shader object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCreateShader.xhtml
+	CreateShader(ty Enum) Shader
+
+	// CreateTexture creates a texture object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenTextures.xhtml
+	CreateTexture() Texture
+
+	// CreateTVertexArray creates a vertex array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenVertexArrays.xhtml
+	CreateVertexArray() VertexArray
+
+	// CullFace specifies which polygons are candidates for culling.
+	//
+	// Valid modes: FRONT, BACK, FRONT_AND_BACK.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glCullFace.xhtml
+	CullFace(mode Enum)
+
+	// DeleteBuffer deletes the given buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteBuffers.xhtml
+	DeleteBuffer(v Buffer)
+
+	// DeleteFramebuffer deletes the given framebuffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteFramebuffers.xhtml
+	DeleteFramebuffer(v Framebuffer)
+
+	// DeleteProgram deletes the given program object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteProgram.xhtml
+	DeleteProgram(p Program)
+
+	// DeleteRenderbuffer deletes the given render buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteRenderbuffers.xhtml
+	DeleteRenderbuffer(v Renderbuffer)
+
+	// DeleteShader deletes shader s.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteShader.xhtml
+	DeleteShader(s Shader)
+
+	// DeleteTexture deletes the given texture object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteTextures.xhtml
+	DeleteTexture(v Texture)
+
+	// DeleteVertexArray deletes the given render buffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDeleteVertexArrays.xhtml
+	DeleteVertexArray(v VertexArray)
+
+	// DepthFunc sets the function used for depth buffer comparisons.
+	//
+	// Valid fn values:
+	//	NEVER
+	//	LESS
+	//	EQUAL
+	//	LEQUAL
+	//	GREATER
+	//	NOTEQUAL
+	//	GEQUAL
+	//	ALWAYS
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDepthFunc.xhtml
+	DepthFunc(fn Enum)
+
+	// DepthMask sets the depth buffer enabled for writing.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDepthMask.xhtml
+	DepthMask(flag bool)
+
+	// DepthRangef sets the mapping from normalized device coordinates to
+	// window coordinates.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDepthRangef.xhtml
+	DepthRangef(n, f float32)
+
+	// DetachShader detaches the shader s from the program p.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDetachShader.xhtml
+	DetachShader(p Program, s Shader)
+
+	// Disable disables various GL capabilities.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDisable.xhtml
+	Disable(cap Enum)
+
+	// DisableVertexAttribArray disables a vertex attribute array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDisableVertexAttribArray.xhtml
+	DisableVertexAttribArray(a Attrib)
+
+	// DrawArrays renders geometric primitives from the bound data.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDrawArrays.xhtml
+	DrawArrays(mode Enum, first, count int)
+
+	// DrawElements renders primitives from a bound buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glDrawElements.xhtml
+	DrawElements(mode Enum, count int, ty Enum, offset int)
+
+	// TODO(crawshaw): consider DrawElements8 / DrawElements16 / DrawElements32
+
+	// Enable enables various GL capabilities.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glEnable.xhtml
+	Enable(cap Enum)
+
+	// EnableVertexAttribArray enables a vertex attribute array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glEnableVertexAttribArray.xhtml
+	EnableVertexAttribArray(a Attrib)
+
+	// Finish blocks until the effects of all previously called GL
+	// commands are complete.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glFinish.xhtml
+	Finish()
+
+	// Flush empties all buffers. It does not block.
+	//
+	// An OpenGL implementation may buffer network communication,
+	// the command stream, or data inside the graphics accelerator.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glFlush.xhtml
+	Flush()
+
+	// FramebufferRenderbuffer attaches rb to the current frame buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glFramebufferRenderbuffer.xhtml
+	FramebufferRenderbuffer(target, attachment, rbTarget Enum, rb Renderbuffer)
+
+	// FramebufferTexture2D attaches the t to the current frame buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glFramebufferTexture2D.xhtml
+	FramebufferTexture2D(target, attachment, texTarget Enum, t Texture, level int)
+
+	// FrontFace defines which polygons are front-facing.
+	//
+	// Valid modes: CW, CCW.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glFrontFace.xhtml
+	FrontFace(mode Enum)
+
+	// GenerateMipmap generates mipmaps for the current texture.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGenerateMipmap.xhtml
+	GenerateMipmap(target Enum)
+
+	// GetActiveAttrib returns details about an active attribute variable.
+	// A value of 0 for index selects the first active attribute variable.
+	// Permissible values for index range from 0 to the number of active
+	// attribute variables minus 1.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetActiveAttrib.xhtml
+	GetActiveAttrib(p Program, index uint32) (name string, size int, ty Enum)
+
+	// GetActiveUniform returns details about an active uniform variable.
+	// A value of 0 for index selects the first active uniform variable.
+	// Permissible values for index range from 0 to the number of active
+	// uniform variables minus 1.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetActiveUniform.xhtml
+	GetActiveUniform(p Program, index uint32) (name string, size int, ty Enum)
+
+	// GetAttachedShaders returns the shader objects attached to program p.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetAttachedShaders.xhtml
+	GetAttachedShaders(p Program) []Shader
+
+	// GetAttribLocation returns the location of an attribute variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetAttribLocation.xhtml
+	GetAttribLocation(p Program, name string) Attrib
+
+	// GetBooleanv returns the boolean values of parameter pname.
+	//
+	// Many boolean parameters can be queried more easily using IsEnabled.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
+	GetBooleanv(dst []bool, pname Enum)
+
+	// GetFloatv returns the float values of parameter pname.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
+	GetFloatv(dst []float32, pname Enum)
+
+	// GetIntegerv returns the int values of parameter pname.
+	//
+	// Single values may be queried more easily using GetInteger.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
+	GetIntegerv(dst []int32, pname Enum)
+
+	// GetInteger returns the int value of parameter pname.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGet.xhtml
+	GetInteger(pname Enum) int
+
+	// GetBufferParameteri returns a parameter for the active buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetBufferParameter.xhtml
+	GetBufferParameteri(target, value Enum) int
+
+	// GetError returns the next error.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetError.xhtml
+	GetError() Enum
+
+	// GetFramebufferAttachmentParameteri returns attachment parameters
+	// for the active framebuffer object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetFramebufferAttachmentParameteriv.xhtml
+	GetFramebufferAttachmentParameteri(target, attachment, pname Enum) int
+
+	// GetProgrami returns a parameter value for a program.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramiv.xhtml
+	GetProgrami(p Program, pname Enum) int
+
+	// GetProgramInfoLog returns the information log for a program.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetProgramInfoLog.xhtml
+	GetProgramInfoLog(p Program) string
+
+	// GetRenderbufferParameteri returns a parameter value for a render buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetRenderbufferParameteriv.xhtml
+	GetRenderbufferParameteri(target, pname Enum) int
+
+	// GetShaderi returns a parameter value for a shader.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetShaderiv.xhtml
+	GetShaderi(s Shader, pname Enum) int
+
+	// GetShaderInfoLog returns the information log for a shader.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetShaderInfoLog.xhtml
+	GetShaderInfoLog(s Shader) string
+
+	// GetShaderPrecisionFormat returns range and precision limits for
+	// shader types.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetShaderPrecisionFormat.xhtml
+	GetShaderPrecisionFormat(shadertype, precisiontype Enum) (rangeLow, rangeHigh, precision int)
+
+	// GetShaderSource returns source code of shader s.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetShaderSource.xhtml
+	GetShaderSource(s Shader) string
+
+	// GetString reports current GL state.
+	//
+	// Valid name values:
+	//	EXTENSIONS
+	//	RENDERER
+	//	SHADING_LANGUAGE_VERSION
+	//	VENDOR
+	//	VERSION
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetString.xhtml
+	GetString(pname Enum) string
+
+	// GetTexParameterfv returns the float values of a texture parameter.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetTexParameter.xhtml
+	GetTexParameterfv(dst []float32, target, pname Enum)
+
+	// GetTexParameteriv returns the int values of a texture parameter.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetTexParameter.xhtml
+	GetTexParameteriv(dst []int32, target, pname Enum)
+
+	// GetUniformfv returns the float values of a uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetUniform.xhtml
+	GetUniformfv(dst []float32, src Uniform, p Program)
+
+	// GetUniformiv returns the float values of a uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetUniform.xhtml
+	GetUniformiv(dst []int32, src Uniform, p Program)
+
+	// GetUniformLocation returns the location of a uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetUniformLocation.xhtml
+	GetUniformLocation(p Program, name string) Uniform
+
+	// GetVertexAttribf reads the float value of a vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetVertexAttrib.xhtml
+	GetVertexAttribf(src Attrib, pname Enum) float32
+
+	// GetVertexAttribfv reads float values of a vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetVertexAttrib.xhtml
+	GetVertexAttribfv(dst []float32, src Attrib, pname Enum)
+
+	// GetVertexAttribi reads the int value of a vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetVertexAttrib.xhtml
+	GetVertexAttribi(src Attrib, pname Enum) int32
+
+	// GetVertexAttribiv reads int values of a vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glGetVertexAttrib.xhtml
+	GetVertexAttribiv(dst []int32, src Attrib, pname Enum)
+
+	// TODO(crawshaw): glGetVertexAttribPointerv
+
+	// Hint sets implementation-specific modes.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glHint.xhtml
+	Hint(target, mode Enum)
+
+	// IsBuffer reports if b is a valid buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsBuffer.xhtml
+	IsBuffer(b Buffer) bool
+
+	// IsEnabled reports if cap is an enabled capability.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsEnabled.xhtml
+	IsEnabled(cap Enum) bool
+
+	// IsFramebuffer reports if fb is a valid frame buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsFramebuffer.xhtml
+	IsFramebuffer(fb Framebuffer) bool
+
+	// IsProgram reports if p is a valid program object.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsProgram.xhtml
+	IsProgram(p Program) bool
+
+	// IsRenderbuffer reports if rb is a valid render buffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsRenderbuffer.xhtml
+	IsRenderbuffer(rb Renderbuffer) bool
+
+	// IsShader reports if s is valid shader.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsShader.xhtml
+	IsShader(s Shader) bool
+
+	// IsTexture reports if t is a valid texture.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glIsTexture.xhtml
+	IsTexture(t Texture) bool
+
+	// LineWidth specifies the width of lines.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glLineWidth.xhtml
+	LineWidth(width float32)
+
+	// LinkProgram links the specified program.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glLinkProgram.xhtml
+	LinkProgram(p Program)
+
+	// PixelStorei sets pixel storage parameters.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glPixelStorei.xhtml
+	PixelStorei(pname Enum, param int32)
+
+	// PolygonOffset sets the scaling factors for depth offsets.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glPolygonOffset.xhtml
+	PolygonOffset(factor, units float32)
+
+	// ReadPixels returns pixel data from a buffer.
+	//
+	// In GLES 3, the source buffer is controlled with ReadBuffer.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glReadPixels.xhtml
+	ReadPixels(dst []byte, x, y, width, height int, format, ty Enum)
+
+	// ReleaseShaderCompiler frees resources allocated by the shader compiler.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glReleaseShaderCompiler.xhtml
+	ReleaseShaderCompiler()
+
+	// RenderbufferStorage establishes the data storage, format, and
+	// dimensions of a renderbuffer object's image.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glRenderbufferStorage.xhtml
+	RenderbufferStorage(target, internalFormat Enum, width, height int)
+
+	// SampleCoverage sets multisample coverage parameters.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glSampleCoverage.xhtml
+	SampleCoverage(value float32, invert bool)
+
+	// Scissor defines the scissor box rectangle, in window coordinates.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glScissor.xhtml
+	Scissor(x, y, width, height int32)
+
+	// TODO(crawshaw): ShaderBinary
+
+	// ShaderSource sets the source code of s to the given source code.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glShaderSource.xhtml
+	ShaderSource(s Shader, src string)
+
+	// StencilFunc sets the front and back stencil test reference value.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilFunc.xhtml
+	StencilFunc(fn Enum, ref int, mask uint32)
+
+	// StencilFunc sets the front or back stencil test reference value.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilFuncSeparate.xhtml
+	StencilFuncSeparate(face, fn Enum, ref int, mask uint32)
+
+	// StencilMask controls the writing of bits in the stencil planes.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilMask.xhtml
+	StencilMask(mask uint32)
+
+	// StencilMaskSeparate controls the writing of bits in the stencil planes.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilMaskSeparate.xhtml
+	StencilMaskSeparate(face Enum, mask uint32)
+
+	// StencilOp sets front and back stencil test actions.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilOp.xhtml
+	StencilOp(fail, zfail, zpass Enum)
+
+	// StencilOpSeparate sets front or back stencil tests.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glStencilOpSeparate.xhtml
+	StencilOpSeparate(face, sfail, dpfail, dppass Enum)
+
+	// TexImage2D writes a 2D texture image.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexImage2D.xhtml
+	TexImage2D(target Enum, level int, internalFormat int, width, height int, format Enum, ty Enum, data []byte)
+
+	// TexSubImage2D writes a subregion of a 2D texture image.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexSubImage2D.xhtml
+	TexSubImage2D(target Enum, level int, x, y, width, height int, format, ty Enum, data []byte)
+
+	// TexParameterf sets a float texture parameter.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexParameter.xhtml
+	TexParameterf(target, pname Enum, param float32)
+
+	// TexParameterfv sets a float texture parameter array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexParameter.xhtml
+	TexParameterfv(target, pname Enum, params []float32)
+
+	// TexParameteri sets an integer texture parameter.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexParameter.xhtml
+	TexParameteri(target, pname Enum, param int)
+
+	// TexParameteriv sets an integer texture parameter array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glTexParameter.xhtml
+	TexParameteriv(target, pname Enum, params []int32)
+
+	// Uniform1f writes a float uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform1f(dst Uniform, v float32)
+
+	// Uniform1fv writes a [len(src)]float uniform array.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform1fv(dst Uniform, src []float32)
+
+	// Uniform1i writes an int uniform variable.
+	//
+	// Uniform1i and Uniform1iv are the only two functions that may be used
+	// to load uniform variables defined as sampler types. Loading samplers
+	// with any other function will result in a INVALID_OPERATION error.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform1i(dst Uniform, v int)
+
+	// Uniform1iv writes a int uniform array of len(src) elements.
+	//
+	// Uniform1i and Uniform1iv are the only two functions that may be used
+	// to load uniform variables defined as sampler types. Loading samplers
+	// with any other function will result in a INVALID_OPERATION error.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform1iv(dst Uniform, src []int32)
+
+	// Uniform2f writes a vec2 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform2f(dst Uniform, v0, v1 float32)
+
+	// Uniform2fv writes a vec2 uniform array of len(src)/2 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform2fv(dst Uniform, src []float32)
+
+	// Uniform2i writes an ivec2 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform2i(dst Uniform, v0, v1 int)
+
+	// Uniform2iv writes an ivec2 uniform array of len(src)/2 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform2iv(dst Uniform, src []int32)
+
+	// Uniform3f writes a vec3 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform3f(dst Uniform, v0, v1, v2 float32)
+
+	// Uniform3fv writes a vec3 uniform array of len(src)/3 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform3fv(dst Uniform, src []float32)
+
+	// Uniform3i writes an ivec3 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform3i(dst Uniform, v0, v1, v2 int32)
+
+	// Uniform3iv writes an ivec3 uniform array of len(src)/3 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform3iv(dst Uniform, src []int32)
+
+	// Uniform4f writes a vec4 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform4f(dst Uniform, v0, v1, v2, v3 float32)
+
+	// Uniform4fv writes a vec4 uniform array of len(src)/4 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform4fv(dst Uniform, src []float32)
+
+	// Uniform4i writes an ivec4 uniform variable.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform4i(dst Uniform, v0, v1, v2, v3 int32)
+
+	// Uniform4i writes an ivec4 uniform array of len(src)/4 elements.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	Uniform4iv(dst Uniform, src []int32)
+
+	// UniformMatrix2fv writes 2x2 matrices. Each matrix uses four
+	// float32 values, so the number of matrices written is len(src)/4.
+	//
+	// Each matrix must be supplied in column major order.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	UniformMatrix2fv(dst Uniform, src []float32)
+
+	// UniformMatrix3fv writes 3x3 matrices. Each matrix uses nine
+	// float32 values, so the number of matrices written is len(src)/9.
+	//
+	// Each matrix must be supplied in column major order.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	UniformMatrix3fv(dst Uniform, src []float32)
+
+	// UniformMatrix4fv writes 4x4 matrices. Each matrix uses 16
+	// float32 values, so the number of matrices written is len(src)/16.
+	//
+	// Each matrix must be supplied in column major order.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUniform.xhtml
+	UniformMatrix4fv(dst Uniform, src []float32)
+
+	// UseProgram sets the active program.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glUseProgram.xhtml
+	UseProgram(p Program)
+
+	// ValidateProgram checks to see whether the executables contained in
+	// program can execute given the current OpenGL state.
+	//
+	// Typically only used for debugging.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glValidateProgram.xhtml
+	ValidateProgram(p Program)
+
+	// VertexAttrib1f writes a float vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib1f(dst Attrib, x float32)
+
+	// VertexAttrib1fv writes a float vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib1fv(dst Attrib, src []float32)
+
+	// VertexAttrib2f writes a vec2 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib2f(dst Attrib, x, y float32)
+
+	// VertexAttrib2fv writes a vec2 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib2fv(dst Attrib, src []float32)
+
+	// VertexAttrib3f writes a vec3 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib3f(dst Attrib, x, y, z float32)
+
+	// VertexAttrib3fv writes a vec3 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib3fv(dst Attrib, src []float32)
+
+	// VertexAttrib4f writes a vec4 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib4f(dst Attrib, x, y, z, w float32)
+
+	// VertexAttrib4fv writes a vec4 vertex attribute.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttrib.xhtml
+	VertexAttrib4fv(dst Attrib, src []float32)
+
+	// VertexAttribPointer uses a bound buffer to define vertex attribute data.
+	//
+	// Direct use of VertexAttribPointer to load data into OpenGL is not
+	// supported via the Go bindings. Instead, use BindBuffer with an
+	// ARRAY_BUFFER and then fill it using BufferData.
+	//
+	// The size argument specifies the number of components per attribute,
+	// between 1-4. The stride argument specifies the byte offset between
+	// consecutive vertex attributes.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glVertexAttribPointer.xhtml
+	VertexAttribPointer(dst Attrib, size int, ty Enum, normalized bool, stride, offset int)
+
+	// Viewport sets the viewport, an affine transformation that
+	// normalizes device coordinates to window coordinates.
+	//
+	// http://www.khronos.org/opengles/sdk/docs/man3/html/glViewport.xhtml
+	Viewport(x, y, width, height int)
+}
+
+// Context3 is an OpenGL ES 3 context.
+//
+// When the gl package is compiled with GL ES 3 support, the produced
+// Context object also implements the Context3 interface.
+type Context3 interface {
+	Context
+
+	// BlitFramebuffer copies a block of pixels between framebuffers.
+	//
+	// https://www.khronos.org/opengles/sdk/docs/man3/html/glBlitFramebuffer.xhtml
+	BlitFramebuffer(srcX0, srcY0, srcX1, srcY1, dstX0, dstY0, dstX1, dstY1 int, mask uint, filter Enum)
+}
+
+// Worker is used by display driver code to execute OpenGL calls.
+//
+// Typically display driver code creates a gl.Context for an application,
+// and along with it establishes a locked OS thread to execute the cgo
+// calls:
+//
+//	go func() {
+//		runtime.LockOSThread()
+//		// ... platform-specific cgo call to bind a C OpenGL context
+//		// into thread-local storage.
+//
+//		glctx, worker := gl.NewContext()
+//		workAvailable := worker.WorkAvailable()
+//		go userAppCode(glctx)
+//		for {
+//			select {
+//			case <-workAvailable:
+//				worker.DoWork()
+//			case <-drawEvent:
+//				// ... platform-specific cgo call to draw screen
+//			}
+//		}
+//	}()
+//
+// This interface is an internal implementation detail and should only be used
+// by the package responsible for managing the screen, such as
+// github.com/ebitengine/gomobile/app.
+type Worker interface {
+	// WorkAvailable returns a channel that communicates when DoWork should be
+	// called.
+	WorkAvailable() <-chan struct{}
+
+	// DoWork performs any pending OpenGL calls.
+	DoWork()
+}

vendor/github.com/ebitengine/gomobile/gl/types_debug.go

@@ -0,0 +1,81 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (darwin || linux || openbsd || windows) && gldebug
+
+package gl
+
+// Alternate versions of the types defined in types.go with extra
+// debugging information attached. For documentation, see types.go.
+
+import "fmt"
+
+type Enum uint32
+
+type Attrib struct {
+	Value uint
+	name  string
+}
+
+type Program struct {
+	Init  bool
+	Value uint32
+}
+
+type Shader struct {
+	Value uint32
+}
+
+type Buffer struct {
+	Value uint32
+}
+
+type Framebuffer struct {
+	Value uint32
+}
+
+type Renderbuffer struct {
+	Value uint32
+}
+
+type Texture struct {
+	Value uint32
+}
+
+type Uniform struct {
+	Value int32
+	name  string
+}
+
+type VertexArray struct {
+	Value uint32
+}
+
+func (v Attrib) c() uintptr { return uintptr(v.Value) }
+func (v Enum) c() uintptr   { return uintptr(v) }
+func (v Program) c() uintptr {
+	if !v.Init {
+		ret := uintptr(0)
+		ret--
+		return ret
+	}
+	return uintptr(v.Value)
+}
+func (v Shader) c() uintptr       { return uintptr(v.Value) }
+func (v Buffer) c() uintptr       { return uintptr(v.Value) }
+func (v Framebuffer) c() uintptr  { return uintptr(v.Value) }
+func (v Renderbuffer) c() uintptr { return uintptr(v.Value) }
+func (v Texture) c() uintptr      { return uintptr(v.Value) }
+func (v Uniform) c() uintptr      { return uintptr(v.Value) }
+func (v VertexArray) c() uintptr  { return uintptr(v.Value) }
+
+func (v Attrib) String() string       { return fmt.Sprintf("Attrib(%d:%s)", v.Value, v.name) }
+func (v Program) String() string      { return fmt.Sprintf("Program(%d)", v.Value) }
+func (v Shader) String() string       { return fmt.Sprintf("Shader(%d)", v.Value) }
+func (v Buffer) String() string       { return fmt.Sprintf("Buffer(%d)", v.Value) }
+func (v Framebuffer) String() string  { return fmt.Sprintf("Framebuffer(%d)", v.Value) }
+func (v Renderbuffer) String() string { return fmt.Sprintf("Renderbuffer(%d)", v.Value) }
+func (v Texture) String() string      { return fmt.Sprintf("Texture(%d)", v.Value) }
+func (v Uniform) String() string      { return fmt.Sprintf("Uniform(%d:%s)", v.Value, v.name) }
+func (v VertexArray) String() string  { return fmt.Sprintf("VertexArray(%d)", v.Value) }

vendor/github.com/ebitengine/gomobile/gl/types_prod.go

@@ -0,0 +1,92 @@
+// Copyright 2014 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (darwin || linux || openbsd || windows) && !gldebug
+
+package gl
+
+import "fmt"
+
+// Enum is equivalent to GLenum, and is normally used with one of the
+// constants defined in this package.
+type Enum uint32
+
+// Types are defined a structs so that in debug mode they can carry
+// extra information, such as a string name. See typesdebug.go.
+
+// Attrib identifies the location of a specific attribute variable.
+type Attrib struct {
+	Value uint
+}
+
+// Program identifies a compiled shader program.
+type Program struct {
+	// Init is set by CreateProgram, as some GL drivers (in particular,
+	// ANGLE) return true for glIsProgram(0).
+	Init  bool
+	Value uint32
+}
+
+// Shader identifies a GLSL shader.
+type Shader struct {
+	Value uint32
+}
+
+// Buffer identifies a GL buffer object.
+type Buffer struct {
+	Value uint32
+}
+
+// Framebuffer identifies a GL framebuffer.
+type Framebuffer struct {
+	Value uint32
+}
+
+// A Renderbuffer is a GL object that holds an image in an internal format.
+type Renderbuffer struct {
+	Value uint32
+}
+
+// A Texture identifies a GL texture unit.
+type Texture struct {
+	Value uint32
+}
+
+// Uniform identifies the location of a specific uniform variable.
+type Uniform struct {
+	Value int32
+}
+
+// A VertexArray is a GL object that holds vertices in an internal format.
+type VertexArray struct {
+	Value uint32
+}
+
+func (v Attrib) c() uintptr { return uintptr(v.Value) }
+func (v Enum) c() uintptr   { return uintptr(v) }
+func (v Program) c() uintptr {
+	if !v.Init {
+		ret := uintptr(0)
+		ret--
+		return ret
+	}
+	return uintptr(v.Value)
+}
+func (v Shader) c() uintptr       { return uintptr(v.Value) }
+func (v Buffer) c() uintptr       { return uintptr(v.Value) }
+func (v Framebuffer) c() uintptr  { return uintptr(v.Value) }
+func (v Renderbuffer) c() uintptr { return uintptr(v.Value) }
+func (v Texture) c() uintptr      { return uintptr(v.Value) }
+func (v Uniform) c() uintptr      { return uintptr(v.Value) }
+func (v VertexArray) c() uintptr  { return uintptr(v.Value) }
+
+func (v Attrib) String() string       { return fmt.Sprintf("Attrib(%d)", v.Value) }
+func (v Program) String() string      { return fmt.Sprintf("Program(%d)", v.Value) }
+func (v Shader) String() string       { return fmt.Sprintf("Shader(%d)", v.Value) }
+func (v Buffer) String() string       { return fmt.Sprintf("Buffer(%d)", v.Value) }
+func (v Framebuffer) String() string  { return fmt.Sprintf("Framebuffer(%d)", v.Value) }
+func (v Renderbuffer) String() string { return fmt.Sprintf("Renderbuffer(%d)", v.Value) }
+func (v Texture) String() string      { return fmt.Sprintf("Texture(%d)", v.Value) }
+func (v Uniform) String() string      { return fmt.Sprintf("Uniform(%d)", v.Value) }
+func (v VertexArray) String() string  { return fmt.Sprintf("VertexArray(%d)", v.Value) }

vendor/github.com/ebitengine/gomobile/gl/work.c

@@ -0,0 +1,557 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || linux || openbsd
+// +build darwin linux openbsd
+
+#include <stdlib.h>
+#include "_cgo_export.h"
+#include "work.h"
+
+#if defined(GL_ES_VERSION_3_0) && GL_ES_VERSION_3_0
+#else
+#include <stdio.h>
+static void gles3missing() {
+	printf("GLES3 function is missing\n");
+	exit(2);
+}
+static void glUniformMatrix2x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glUniformMatrix3x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glUniformMatrix2x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glUniformMatrix4x2fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glUniformMatrix3x4fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glUniformMatrix4x3fv(GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) { gles3missing(); }
+static void glBlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter) { gles3missing(); }
+static void glUniform1ui(GLint location, GLuint v0) { gles3missing(); }
+static void glUniform2ui(GLint location, GLuint v0, GLuint v1) { gles3missing(); }
+static void glUniform3ui(GLint location, GLuint v0, GLuint v1, GLuint v2) { gles3missing(); }
+static void glUniform4ui(GLint location, GLuint v0, GLuint v1, GLuint v2, GLuint v3) { gles3missing(); }
+static void glUniform1uiv(GLint location, GLsizei count, const GLuint *value) { gles3missing(); }
+static void glUniform2uiv(GLint location, GLsizei count, const GLuint *value) { gles3missing(); }
+static void glUniform3uiv(GLint location, GLsizei count, const GLuint *value) { gles3missing(); }
+static void glUniform4uiv(GLint location, GLsizei count, const GLuint *value) { gles3missing(); }
+static void glBindVertexArray(GLuint array) { gles3missing(); }
+static void glGenVertexArrays(GLsizei n, GLuint *arrays) { gles3missing(); }
+static void glDeleteVertexArrays(GLsizei n, const GLuint *arrays) { gles3missing(); }
+#endif
+
+uintptr_t processFn(struct fnargs* args, char* parg) {
+	uintptr_t ret = 0;
+	switch (args->fn) {
+	case glfnUNDEFINED:
+		abort(); // bad glfn
+		break;
+	case glfnActiveTexture:
+		glActiveTexture((GLenum)args->a0);
+		break;
+	case glfnAttachShader:
+		glAttachShader((GLint)args->a0, (GLint)args->a1);
+		break;
+	case glfnBindAttribLocation:
+		glBindAttribLocation((GLint)args->a0, (GLint)args->a1, (GLchar*)args->a2);
+		break;
+	case glfnBindBuffer:
+		glBindBuffer((GLenum)args->a0, (GLuint)args->a1);
+		break;
+	case glfnBindFramebuffer:
+		glBindFramebuffer((GLenum)args->a0, (GLint)args->a1);
+		break;
+	case glfnBindRenderbuffer:
+		glBindRenderbuffer((GLenum)args->a0, (GLint)args->a1);
+		break;
+	case glfnBindTexture:
+		glBindTexture((GLenum)args->a0, (GLint)args->a1);
+		break;
+	case glfnBindVertexArray:
+		glBindVertexArray((GLenum)args->a0);
+		break;
+	case glfnBlendColor:
+		glBlendColor(*(GLfloat*)&args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3);
+		break;
+	case glfnBlendEquation:
+		glBlendEquation((GLenum)args->a0);
+		break;
+	case glfnBlendEquationSeparate:
+		glBlendEquationSeparate((GLenum)args->a0, (GLenum)args->a1);
+		break;
+	case glfnBlendFunc:
+		glBlendFunc((GLenum)args->a0, (GLenum)args->a1);
+		break;
+	case glfnBlendFuncSeparate:
+		glBlendFuncSeparate((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2, (GLenum)args->a3);
+		break;
+	case glfnBlitFramebuffer:
+		glBlitFramebuffer((GLint)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3, (GLint)args->a4, (GLint)args->a5, (GLint)args->a6, (GLint)args->a7, (GLbitfield)args->a8, (GLenum)args->a9);
+		break;
+	case glfnBufferData:
+		glBufferData((GLenum)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg, (GLenum)args->a2);
+		break;
+	case glfnBufferSubData:
+		glBufferSubData((GLenum)args->a0, (GLint)args->a1, (GLsizeiptr)args->a2, (GLvoid*)parg);
+		break;
+	case glfnCheckFramebufferStatus:
+		ret = glCheckFramebufferStatus((GLenum)args->a0);
+		break;
+	case glfnClear:
+		glClear((GLenum)args->a0);
+		break;
+	case glfnClearColor:
+		glClearColor(*(GLfloat*)&args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3);
+		break;
+	case glfnClearDepthf:
+		glClearDepthf(*(GLfloat*)&args->a0);
+		break;
+	case glfnClearStencil:
+		glClearStencil((GLint)args->a0);
+		break;
+	case glfnColorMask:
+		glColorMask((GLboolean)args->a0, (GLboolean)args->a1, (GLboolean)args->a2, (GLboolean)args->a3);
+		break;
+	case glfnCompileShader:
+		glCompileShader((GLint)args->a0);
+		break;
+	case glfnCompressedTexImage2D:
+		glCompressedTexImage2D((GLenum)args->a0, (GLint)args->a1, (GLenum)args->a2, (GLint)args->a3, (GLint)args->a4, (GLint)args->a5, (GLsizeiptr)args->a6, (GLvoid*)parg);
+		break;
+	case glfnCompressedTexSubImage2D:
+		glCompressedTexSubImage2D((GLenum)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3, (GLint)args->a4, (GLint)args->a5, (GLenum)args->a6, (GLsizeiptr)args->a7, (GLvoid*)parg);
+		break;
+	case glfnCopyTexImage2D:
+		glCopyTexImage2D((GLenum)args->a0, (GLint)args->a1, (GLenum)args->a2, (GLint)args->a3, (GLint)args->a4, (GLint)args->a5, (GLint)args->a6, (GLint)args->a7);
+		break;
+	case glfnCopyTexSubImage2D:
+		glCopyTexSubImage2D((GLenum)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3, (GLint)args->a4, (GLint)args->a5, (GLint)args->a6, (GLint)args->a7);
+		break;
+	case glfnCreateProgram:
+		ret = glCreateProgram();
+		break;
+	case glfnCreateShader:
+		ret = glCreateShader((GLenum)args->a0);
+		break;
+	case glfnCullFace:
+		glCullFace((GLenum)args->a0);
+		break;
+	case glfnDeleteBuffer:
+		glDeleteBuffers(1, (const GLuint*)(&args->a0));
+		break;
+	case glfnDeleteFramebuffer:
+		glDeleteFramebuffers(1, (const GLuint*)(&args->a0));
+		break;
+	case glfnDeleteProgram:
+		glDeleteProgram((GLint)args->a0);
+		break;
+	case glfnDeleteRenderbuffer:
+		glDeleteRenderbuffers(1, (const GLuint*)(&args->a0));
+		break;
+	case glfnDeleteShader:
+		glDeleteShader((GLint)args->a0);
+		break;
+	case glfnDeleteTexture:
+		glDeleteTextures(1, (const GLuint*)(&args->a0));
+		break;
+	case glfnDeleteVertexArray:
+		glDeleteVertexArrays(1, (const GLuint*)(&args->a0));
+		break;
+	case glfnDepthFunc:
+		glDepthFunc((GLenum)args->a0);
+		break;
+	case glfnDepthMask:
+		glDepthMask((GLboolean)args->a0);
+		break;
+	case glfnDepthRangef:
+		glDepthRangef(*(GLfloat*)&args->a0, *(GLfloat*)&args->a1);
+		break;
+	case glfnDetachShader:
+		glDetachShader((GLint)args->a0, (GLint)args->a1);
+		break;
+	case glfnDisable:
+		glDisable((GLenum)args->a0);
+		break;
+	case glfnDisableVertexAttribArray:
+		glDisableVertexAttribArray((GLint)args->a0);
+		break;
+	case glfnDrawArrays:
+		glDrawArrays((GLenum)args->a0, (GLint)args->a1, (GLint)args->a2);
+		break;
+	case glfnDrawElements:
+		glDrawElements((GLenum)args->a0, (GLint)args->a1, (GLenum)args->a2, (void*)args->a3);
+		break;
+	case glfnEnable:
+		glEnable((GLenum)args->a0);
+		break;
+	case glfnEnableVertexAttribArray:
+		glEnableVertexAttribArray((GLint)args->a0);
+		break;
+	case glfnFinish:
+		glFinish();
+		break;
+	case glfnFlush:
+		glFlush();
+		break;
+	case glfnFramebufferRenderbuffer:
+		glFramebufferRenderbuffer((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2, (GLint)args->a3);
+		break;
+	case glfnFramebufferTexture2D:
+		glFramebufferTexture2D((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2, (GLint)args->a3, (GLint)args->a4);
+		break;
+	case glfnFrontFace:
+		glFrontFace((GLenum)args->a0);
+		break;
+	case glfnGenBuffer:
+		glGenBuffers(1, (GLuint*)&ret);
+		break;
+	case glfnGenFramebuffer:
+		glGenFramebuffers(1, (GLuint*)&ret);
+		break;
+	case glfnGenRenderbuffer:
+		glGenRenderbuffers(1, (GLuint*)&ret);
+		break;
+	case glfnGenTexture:
+		glGenTextures(1, (GLuint*)&ret);
+		break;
+	case glfnGenVertexArray:
+		glGenVertexArrays(1, (GLuint*)&ret);
+		break;
+	case glfnGenerateMipmap:
+		glGenerateMipmap((GLenum)args->a0);
+		break;
+	case glfnGetActiveAttrib:
+		glGetActiveAttrib(
+			(GLuint)args->a0,
+			(GLuint)args->a1,
+			(GLsizei)args->a2,
+			NULL,
+			(GLint*)&ret,
+			(GLenum*)args->a3,
+			(GLchar*)parg);
+		break;
+	case glfnGetActiveUniform:
+		glGetActiveUniform(
+			(GLuint)args->a0,
+			(GLuint)args->a1,
+			(GLsizei)args->a2,
+			NULL,
+			(GLint*)&ret,
+			(GLenum*)args->a3,
+			(GLchar*)parg);
+		break;
+	case glfnGetAttachedShaders:
+		glGetAttachedShaders((GLuint)args->a0, (GLsizei)args->a1, (GLsizei*)&ret, (GLuint*)parg);
+		break;
+	case glfnGetAttribLocation:
+		ret = glGetAttribLocation((GLint)args->a0, (GLchar*)args->a1);
+		break;
+	case glfnGetBooleanv:
+		glGetBooleanv((GLenum)args->a0, (GLboolean*)parg);
+		break;
+	case glfnGetBufferParameteri:
+		glGetBufferParameteriv((GLenum)args->a0, (GLenum)args->a1, (GLint*)&ret);
+		break;
+	case glfnGetFloatv:
+		glGetFloatv((GLenum)args->a0, (GLfloat*)parg);
+		break;
+	case glfnGetIntegerv:
+		glGetIntegerv((GLenum)args->a0, (GLint*)parg);
+		break;
+	case glfnGetError:
+		ret = glGetError();
+		break;
+	case glfnGetFramebufferAttachmentParameteriv:
+		glGetFramebufferAttachmentParameteriv((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2, (GLint*)&ret);
+		break;
+	case glfnGetProgramiv:
+		glGetProgramiv((GLint)args->a0, (GLenum)args->a1, (GLint*)&ret);
+		break;
+	case glfnGetProgramInfoLog:
+		glGetProgramInfoLog((GLuint)args->a0, (GLsizei)args->a1, 0, (GLchar*)parg);
+		break;
+	case glfnGetRenderbufferParameteriv:
+		glGetRenderbufferParameteriv((GLenum)args->a0, (GLenum)args->a1, (GLint*)&ret);
+		break;
+	case glfnGetShaderiv:
+		glGetShaderiv((GLint)args->a0, (GLenum)args->a1, (GLint*)&ret);
+		break;
+	case glfnGetShaderInfoLog:
+		glGetShaderInfoLog((GLuint)args->a0, (GLsizei)args->a1, 0, (GLchar*)parg);
+		break;
+	case glfnGetShaderPrecisionFormat:
+		glGetShaderPrecisionFormat((GLenum)args->a0, (GLenum)args->a1, (GLint*)parg, &((GLint*)parg)[2]);
+		break;
+	case glfnGetShaderSource:
+		glGetShaderSource((GLuint)args->a0, (GLsizei)args->a1, 0, (GLchar*)parg);
+		break;
+	case glfnGetString:
+		ret = (uintptr_t)glGetString((GLenum)args->a0);
+		break;
+	case glfnGetTexParameterfv:
+		glGetTexParameterfv((GLenum)args->a0, (GLenum)args->a1, (GLfloat*)parg);
+		break;
+	case glfnGetTexParameteriv:
+		glGetTexParameteriv((GLenum)args->a0, (GLenum)args->a1, (GLint*)parg);
+		break;
+	case glfnGetUniformfv:
+		glGetUniformfv((GLuint)args->a0, (GLint)args->a1, (GLfloat*)parg);
+		break;
+	case glfnGetUniformiv:
+		glGetUniformiv((GLuint)args->a0, (GLint)args->a1, (GLint*)parg);
+		break;
+	case glfnGetUniformLocation:
+		ret = glGetUniformLocation((GLint)args->a0, (GLchar*)args->a1);
+		break;
+	case glfnGetVertexAttribfv:
+		glGetVertexAttribfv((GLuint)args->a0, (GLenum)args->a1, (GLfloat*)parg);
+		break;
+	case glfnGetVertexAttribiv:
+		glGetVertexAttribiv((GLuint)args->a0, (GLenum)args->a1, (GLint*)parg);
+		break;
+	case glfnHint:
+		glHint((GLenum)args->a0, (GLenum)args->a1);
+		break;
+	case glfnIsBuffer:
+		ret = glIsBuffer((GLint)args->a0);
+		break;
+	case glfnIsEnabled:
+		ret = glIsEnabled((GLenum)args->a0);
+		break;
+	case glfnIsFramebuffer:
+		ret = glIsFramebuffer((GLint)args->a0);
+		break;
+	case glfnIsProgram:
+		ret = glIsProgram((GLint)args->a0);
+		break;
+	case glfnIsRenderbuffer:
+		ret = glIsRenderbuffer((GLint)args->a0);
+		break;
+	case glfnIsShader:
+		ret = glIsShader((GLint)args->a0);
+		break;
+	case glfnIsTexture:
+		ret = glIsTexture((GLint)args->a0);
+		break;
+	case glfnLineWidth:
+		glLineWidth(*(GLfloat*)&args->a0);
+		break;
+	case glfnLinkProgram:
+		glLinkProgram((GLint)args->a0);
+		break;
+	case glfnPixelStorei:
+		glPixelStorei((GLenum)args->a0, (GLint)args->a1);
+		break;
+	case glfnPolygonOffset:
+		glPolygonOffset(*(GLfloat*)&args->a0, *(GLfloat*)&args->a1);
+		break;
+	case glfnReadPixels:
+		glReadPixels((GLint)args->a0, (GLint)args->a1, (GLsizei)args->a2, (GLsizei)args->a3, (GLenum)args->a4, (GLenum)args->a5, (void*)parg);
+		break;
+	case glfnReleaseShaderCompiler:
+		glReleaseShaderCompiler();
+		break;
+	case glfnRenderbufferStorage:
+		glRenderbufferStorage((GLenum)args->a0, (GLenum)args->a1, (GLint)args->a2, (GLint)args->a3);
+		break;
+	case glfnSampleCoverage:
+		glSampleCoverage(*(GLfloat*)&args->a0, (GLboolean)args->a1);
+		break;
+	case glfnScissor:
+		glScissor((GLint)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3);
+		break;
+	case glfnShaderSource:
+#if defined(os_ios) || defined(os_macos)
+		glShaderSource((GLuint)args->a0, (GLsizei)args->a1, (const GLchar *const *)args->a2, NULL);
+#else
+		glShaderSource((GLuint)args->a0, (GLsizei)args->a1, (const GLchar **)args->a2, NULL);
+#endif
+		break;
+	case glfnStencilFunc:
+		glStencilFunc((GLenum)args->a0, (GLint)args->a1, (GLuint)args->a2);
+		break;
+	case glfnStencilFuncSeparate:
+		glStencilFuncSeparate((GLenum)args->a0, (GLenum)args->a1, (GLint)args->a2, (GLuint)args->a3);
+		break;
+	case glfnStencilMask:
+		glStencilMask((GLuint)args->a0);
+		break;
+	case glfnStencilMaskSeparate:
+		glStencilMaskSeparate((GLenum)args->a0, (GLuint)args->a1);
+		break;
+	case glfnStencilOp:
+		glStencilOp((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2);
+		break;
+	case glfnStencilOpSeparate:
+		glStencilOpSeparate((GLenum)args->a0, (GLenum)args->a1, (GLenum)args->a2, (GLenum)args->a3);
+		break;
+	case glfnTexImage2D:
+		glTexImage2D(
+			(GLenum)args->a0,
+			(GLint)args->a1,
+			(GLint)args->a2,
+			(GLsizei)args->a3,
+			(GLsizei)args->a4,
+			0, // border
+			(GLenum)args->a5,
+			(GLenum)args->a6,
+			(const GLvoid*)parg);
+		break;
+	case glfnTexSubImage2D:
+		glTexSubImage2D(
+			(GLenum)args->a0,
+			(GLint)args->a1,
+			(GLint)args->a2,
+			(GLint)args->a3,
+			(GLsizei)args->a4,
+			(GLsizei)args->a5,
+			(GLenum)args->a6,
+			(GLenum)args->a7,
+			(const GLvoid*)parg);
+		break;
+	case glfnTexParameterf:
+		glTexParameterf((GLenum)args->a0, (GLenum)args->a1, *(GLfloat*)&args->a2);
+		break;
+	case glfnTexParameterfv:
+		glTexParameterfv((GLenum)args->a0, (GLenum)args->a1, (GLfloat*)parg);
+		break;
+	case glfnTexParameteri:
+		glTexParameteri((GLenum)args->a0, (GLenum)args->a1, (GLint)args->a2);
+		break;
+	case glfnTexParameteriv:
+		glTexParameteriv((GLenum)args->a0, (GLenum)args->a1, (GLint*)parg);
+		break;
+	case glfnUniform1f:
+		glUniform1f((GLint)args->a0, *(GLfloat*)&args->a1);
+		break;
+	case glfnUniform1fv:
+		glUniform1fv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform1i:
+		glUniform1i((GLint)args->a0, (GLint)args->a1);
+		break;
+	case glfnUniform1ui:
+		glUniform1ui((GLint)args->a0, (GLuint)args->a1);
+		break;
+	case glfnUniform1uiv:
+		glUniform1uiv((GLint)args->a0, (GLsizeiptr)args->a1, (GLuint*)parg);
+		break;
+	case glfnUniform1iv:
+		glUniform1iv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform2f:
+		glUniform2f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2);
+		break;
+	case glfnUniform2fv:
+		glUniform2fv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform2i:
+		glUniform2i((GLint)args->a0, (GLint)args->a1, (GLint)args->a2);
+		break;
+	case glfnUniform2ui:
+		glUniform2ui((GLint)args->a0, (GLuint)args->a1, (GLuint)args->a2);
+		break;
+	case glfnUniform2uiv:
+		glUniform2uiv((GLint)args->a0, (GLsizeiptr)args->a1, (GLuint*)parg);
+		break;
+	case glfnUniform2iv:
+		glUniform2iv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform3f:
+		glUniform3f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3);
+		break;
+	case glfnUniform3fv:
+		glUniform3fv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform3i:
+		glUniform3i((GLint)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3);
+		break;
+	case glfnUniform3ui:
+		glUniform3ui((GLint)args->a0, (GLuint)args->a1, (GLuint)args->a2, (GLuint)args->a3);
+		break;
+	case glfnUniform3uiv:
+		glUniform3uiv((GLint)args->a0, (GLsizeiptr)args->a1, (GLuint*)parg);
+		break;
+	case glfnUniform3iv:
+		glUniform3iv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform4f:
+		glUniform4f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3, *(GLfloat*)&args->a4);
+		break;
+	case glfnUniform4fv:
+		glUniform4fv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniform4i:
+		glUniform4i((GLint)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3, (GLint)args->a4);
+		break;
+	case glfnUniform4ui:
+		glUniform4ui((GLint)args->a0, (GLuint)args->a1, (GLuint)args->a2, (GLuint)args->a3, (GLuint)args->a4);
+		break;
+	case glfnUniform4uiv:
+		glUniform4uiv((GLint)args->a0, (GLsizeiptr)args->a1, (GLuint*)parg);
+		break;
+	case glfnUniform4iv:
+		glUniform4iv((GLint)args->a0, (GLsizeiptr)args->a1, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix2fv:
+		glUniformMatrix2fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix3fv:
+		glUniformMatrix3fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix4fv:
+		glUniformMatrix4fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix2x3fv:
+		glUniformMatrix2x3fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix3x2fv:
+		glUniformMatrix3x2fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix2x4fv:
+		glUniformMatrix2x4fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix4x2fv:
+		glUniformMatrix4x2fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix3x4fv:
+		glUniformMatrix3x4fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUniformMatrix4x3fv:
+		glUniformMatrix4x3fv((GLint)args->a0, (GLsizeiptr)args->a1, 0, (GLvoid*)parg);
+		break;
+	case glfnUseProgram:
+		glUseProgram((GLint)args->a0);
+		break;
+	case glfnValidateProgram:
+		glValidateProgram((GLint)args->a0);
+		break;
+	case glfnVertexAttrib1f:
+		glVertexAttrib1f((GLint)args->a0, *(GLfloat*)&args->a1);
+		break;
+	case glfnVertexAttrib1fv:
+		glVertexAttrib1fv((GLint)args->a0, (GLfloat*)parg);
+		break;
+	case glfnVertexAttrib2f:
+		glVertexAttrib2f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2);
+		break;
+	case glfnVertexAttrib2fv:
+		glVertexAttrib2fv((GLint)args->a0, (GLfloat*)parg);
+		break;
+	case glfnVertexAttrib3f:
+		glVertexAttrib3f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3);
+		break;
+	case glfnVertexAttrib3fv:
+		glVertexAttrib3fv((GLint)args->a0, (GLfloat*)parg);
+		break;
+	case glfnVertexAttrib4f:
+		glVertexAttrib4f((GLint)args->a0, *(GLfloat*)&args->a1, *(GLfloat*)&args->a2, *(GLfloat*)&args->a3, *(GLfloat*)&args->a4);
+		break;
+	case glfnVertexAttrib4fv:
+		glVertexAttrib4fv((GLint)args->a0, (GLfloat*)parg);
+		break;
+	case glfnVertexAttribPointer:
+		glVertexAttribPointer((GLuint)args->a0, (GLint)args->a1, (GLenum)args->a2, (GLboolean)args->a3, (GLsizei)args->a4, (const GLvoid*)args->a5);
+		break;
+	case glfnViewport:
+		glViewport((GLint)args->a0, (GLint)args->a1, (GLint)args->a2, (GLint)args->a3);
+		break;
+	}
+	return ret;
+}

vendor/github.com/ebitengine/gomobile/gl/work.go

@@ -0,0 +1,173 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || linux || openbsd
+
+package gl
+
+/*
+#cgo ios          LDFLAGS: -framework OpenGLES
+#cgo darwin,!ios  LDFLAGS: -framework OpenGL
+#cgo linux        LDFLAGS: -lGLESv2
+#cgo openbsd      LDFLAGS: -L/usr/X11R6/lib/ -lGLESv2
+
+#cgo android      CFLAGS: -Dos_android
+#cgo ios          CFLAGS: -Dos_ios
+#cgo darwin,!ios  CFLAGS: -Dos_macos
+#cgo darwin       CFLAGS: -DGL_SILENCE_DEPRECATION -DGLES_SILENCE_DEPRECATION
+#cgo linux        CFLAGS: -Dos_linux
+#cgo openbsd      CFLAGS: -Dos_openbsd
+
+#cgo openbsd      CFLAGS: -I/usr/X11R6/include/
+
+#include <stdint.h>
+#include "work.h"
+
+uintptr_t process(struct fnargs* cargs, char* parg0, char* parg1, char* parg2, int count) {
+	uintptr_t ret;
+
+	ret = processFn(&cargs[0], parg0);
+	if (count > 1) {
+		ret = processFn(&cargs[1], parg1);
+	}
+	if (count > 2) {
+		ret = processFn(&cargs[2], parg2);
+	}
+
+	return ret;
+}
+*/
+import "C"
+
+import "unsafe"
+
+const workbufLen = 3
+
+type context struct {
+	cptr  uintptr
+	debug int32
+
+	workAvailable chan struct{}
+
+	// work is a queue of calls to execute.
+	work chan call
+
+	// retvalue is sent a return value when blocking calls complete.
+	// It is safe to use a global unbuffered channel here as calls
+	// cannot currently be made concurrently.
+	//
+	// TODO: the comment above about concurrent calls isn't actually true: package
+	// app calls package gl, but it has to do so in a separate goroutine, which
+	// means that its gl calls (which may be blocking) can race with other gl calls
+	// in the main program. We should make it safe to issue blocking gl calls
+	// concurrently, or get the gl calls out of package app, or both.
+	retvalue chan C.uintptr_t
+
+	cargs [workbufLen]C.struct_fnargs
+	parg  [workbufLen]*C.char
+}
+
+func (ctx *context) WorkAvailable() <-chan struct{} { return ctx.workAvailable }
+
+type context3 struct {
+	*context
+}
+
+// NewContext creates a cgo OpenGL context.
+//
+// See the Worker interface for more details on how it is used.
+func NewContext() (Context, Worker) {
+	glctx := &context{
+		workAvailable: make(chan struct{}, 1),
+		work:          make(chan call, workbufLen),
+		retvalue:      make(chan C.uintptr_t),
+	}
+	if C.GLES_VERSION == "GL_ES_2_0" {
+		return glctx, glctx
+	}
+	return context3{glctx}, glctx
+}
+
+// Version returns a GL ES version string, either "GL_ES_2_0" or "GL_ES_3_0".
+// Future versions of the gl package may return "GL_ES_3_1".
+func Version() string {
+	return C.GLES_VERSION
+}
+
+func (ctx *context) enqueue(c call) uintptr {
+	ctx.work <- c
+
+	select {
+	case ctx.workAvailable <- struct{}{}:
+	default:
+	}
+
+	if c.blocking {
+		return uintptr(<-ctx.retvalue)
+	}
+	return 0
+}
+
+func (ctx *context) DoWork() {
+	queue := make([]call, 0, workbufLen)
+	for {
+		// Wait until at least one piece of work is ready.
+		// Accumulate work until a piece is marked as blocking.
+		select {
+		case w := <-ctx.work:
+			queue = append(queue, w)
+		default:
+			return
+		}
+		blocking := queue[len(queue)-1].blocking
+	enqueue:
+		for len(queue) < cap(queue) && !blocking {
+			select {
+			case w := <-ctx.work:
+				queue = append(queue, w)
+				blocking = queue[len(queue)-1].blocking
+			default:
+				break enqueue
+			}
+		}
+
+		// Process the queued GL functions.
+		for i, q := range queue {
+			ctx.cargs[i] = *(*C.struct_fnargs)(unsafe.Pointer(&q.args))
+			ctx.parg[i] = (*C.char)(q.parg)
+		}
+		ret := C.process(&ctx.cargs[0], ctx.parg[0], ctx.parg[1], ctx.parg[2], C.int(len(queue)))
+
+		// Cleanup and signal.
+		queue = queue[:0]
+		if blocking {
+			ctx.retvalue <- ret
+		}
+	}
+}
+
+func init() {
+	if unsafe.Sizeof(C.GLint(0)) != unsafe.Sizeof(int32(0)) {
+		panic("GLint is not an int32")
+	}
+}
+
+// cString creates C string off the Go heap.
+// ret is a *char.
+func (ctx *context) cString(str string) (uintptr, func()) {
+	ptr := unsafe.Pointer(C.CString(str))
+	return uintptr(ptr), func() { C.free(ptr) }
+}
+
+// cString creates a pointer to a C string off the Go heap.
+// ret is a **char.
+func (ctx *context) cStringPtr(str string) (uintptr, func()) {
+	s, free := ctx.cString(str)
+	ptr := C.malloc(C.size_t(unsafe.Sizeof((*int)(nil))))
+	*(*uintptr)(ptr) = s
+	return uintptr(ptr), func() {
+		free()
+		C.free(ptr)
+	}
+}

vendor/github.com/ebitengine/gomobile/gl/work.h

@@ -0,0 +1,217 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifdef os_android
+// TODO(crawshaw): We could include <android/api-level.h> and
+// condition on __ANDROID_API__ to get GLES3 headers. However
+// we also need to add -lGLESv3 to LDFLAGS, which we cannot do
+// from inside an ifdef.
+#include <GLES2/gl2.h>
+#elif os_linux
+#include <GLES3/gl3.h> // install on Ubuntu with: sudo apt-get install libegl1-mesa-dev libgles2-mesa-dev libx11-dev
+#elif os_openbsd
+#include <GLES3/gl3.h>
+#endif
+
+#ifdef os_ios
+#include <OpenGLES/ES2/glext.h>
+#endif
+
+#ifdef os_macos
+#include <OpenGL/gl3.h>
+#define GL_ES_VERSION_3_0 1
+#endif
+
+#if defined(GL_ES_VERSION_3_0) && GL_ES_VERSION_3_0
+#define GLES_VERSION "GL_ES_3_0"
+#else
+#define GLES_VERSION "GL_ES_2_0"
+#endif
+
+#include <stdint.h>
+#include <stdlib.h>
+
+// TODO: generate this enum from fn.go.
+typedef enum {
+	glfnUNDEFINED,
+
+	glfnActiveTexture,
+	glfnAttachShader,
+	glfnBindAttribLocation,
+	glfnBindBuffer,
+	glfnBindFramebuffer,
+	glfnBindRenderbuffer,
+	glfnBindTexture,
+	glfnBindVertexArray,
+	glfnBlendColor,
+	glfnBlendEquation,
+	glfnBlendEquationSeparate,
+	glfnBlendFunc,
+	glfnBlendFuncSeparate,
+	glfnBufferData,
+	glfnBufferSubData,
+	glfnCheckFramebufferStatus,
+	glfnClear,
+	glfnClearColor,
+	glfnClearDepthf,
+	glfnClearStencil,
+	glfnColorMask,
+	glfnCompileShader,
+	glfnCompressedTexImage2D,
+	glfnCompressedTexSubImage2D,
+	glfnCopyTexImage2D,
+	glfnCopyTexSubImage2D,
+	glfnCreateProgram,
+	glfnCreateShader,
+	glfnCullFace,
+	glfnDeleteBuffer,
+	glfnDeleteFramebuffer,
+	glfnDeleteProgram,
+	glfnDeleteRenderbuffer,
+	glfnDeleteShader,
+	glfnDeleteTexture,
+	glfnDeleteVertexArray,
+	glfnDepthFunc,
+	glfnDepthRangef,
+	glfnDepthMask,
+	glfnDetachShader,
+	glfnDisable,
+	glfnDisableVertexAttribArray,
+	glfnDrawArrays,
+	glfnDrawElements,
+	glfnEnable,
+	glfnEnableVertexAttribArray,
+	glfnFinish,
+	glfnFlush,
+	glfnFramebufferRenderbuffer,
+	glfnFramebufferTexture2D,
+	glfnFrontFace,
+	glfnGenBuffer,
+	glfnGenFramebuffer,
+	glfnGenRenderbuffer,
+	glfnGenTexture,
+	glfnGenVertexArray,
+	glfnGenerateMipmap,
+	glfnGetActiveAttrib,
+	glfnGetActiveUniform,
+	glfnGetAttachedShaders,
+	glfnGetAttribLocation,
+	glfnGetBooleanv,
+	glfnGetBufferParameteri,
+	glfnGetError,
+	glfnGetFloatv,
+	glfnGetFramebufferAttachmentParameteriv,
+	glfnGetIntegerv,
+	glfnGetProgramInfoLog,
+	glfnGetProgramiv,
+	glfnGetRenderbufferParameteriv,
+	glfnGetShaderInfoLog,
+	glfnGetShaderPrecisionFormat,
+	glfnGetShaderSource,
+	glfnGetShaderiv,
+	glfnGetString,
+	glfnGetTexParameterfv,
+	glfnGetTexParameteriv,
+	glfnGetUniformLocation,
+	glfnGetUniformfv,
+	glfnGetUniformiv,
+	glfnGetVertexAttribfv,
+	glfnGetVertexAttribiv,
+	glfnHint,
+	glfnIsBuffer,
+	glfnIsEnabled,
+	glfnIsFramebuffer,
+	glfnIsProgram,
+	glfnIsRenderbuffer,
+	glfnIsShader,
+	glfnIsTexture,
+	glfnLineWidth,
+	glfnLinkProgram,
+	glfnPixelStorei,
+	glfnPolygonOffset,
+	glfnReadPixels,
+	glfnReleaseShaderCompiler,
+	glfnRenderbufferStorage,
+	glfnSampleCoverage,
+	glfnScissor,
+	glfnShaderSource,
+	glfnStencilFunc,
+	glfnStencilFuncSeparate,
+	glfnStencilMask,
+	glfnStencilMaskSeparate,
+	glfnStencilOp,
+	glfnStencilOpSeparate,
+	glfnTexImage2D,
+	glfnTexParameterf,
+	glfnTexParameterfv,
+	glfnTexParameteri,
+	glfnTexParameteriv,
+	glfnTexSubImage2D,
+	glfnUniform1f,
+	glfnUniform1fv,
+	glfnUniform1i,
+	glfnUniform1iv,
+	glfnUniform2f,
+	glfnUniform2fv,
+	glfnUniform2i,
+	glfnUniform2iv,
+	glfnUniform3f,
+	glfnUniform3fv,
+	glfnUniform3i,
+	glfnUniform3iv,
+	glfnUniform4f,
+	glfnUniform4fv,
+	glfnUniform4i,
+	glfnUniform4iv,
+	glfnUniformMatrix2fv,
+	glfnUniformMatrix3fv,
+	glfnUniformMatrix4fv,
+	glfnUseProgram,
+	glfnValidateProgram,
+	glfnVertexAttrib1f,
+	glfnVertexAttrib1fv,
+	glfnVertexAttrib2f,
+	glfnVertexAttrib2fv,
+	glfnVertexAttrib3f,
+	glfnVertexAttrib3fv,
+	glfnVertexAttrib4f,
+	glfnVertexAttrib4fv,
+	glfnVertexAttribPointer,
+	glfnViewport,
+
+	// ES 3.0 functions
+	glfnUniformMatrix2x3fv,
+	glfnUniformMatrix3x2fv,
+	glfnUniformMatrix2x4fv,
+	glfnUniformMatrix4x2fv,
+	glfnUniformMatrix3x4fv,
+	glfnUniformMatrix4x3fv,
+	glfnBlitFramebuffer,
+	glfnUniform1ui,
+	glfnUniform2ui,
+	glfnUniform3ui,
+	glfnUniform4ui,
+	glfnUniform1uiv,
+	glfnUniform2uiv,
+	glfnUniform3uiv,
+	glfnUniform4uiv,
+} glfn;
+
+// TODO: generate this type from fn.go.
+struct fnargs {
+	glfn fn;
+
+	uintptr_t a0;
+	uintptr_t a1;
+	uintptr_t a2;
+	uintptr_t a3;
+	uintptr_t a4;
+	uintptr_t a5;
+	uintptr_t a6;
+	uintptr_t a7;
+	uintptr_t a8;
+	uintptr_t a9;
+};
+
+extern uintptr_t processFn(struct fnargs* args, char* parg);

vendor/github.com/ebitengine/gomobile/gl/work_other.go

@@ -0,0 +1,35 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build (!cgo || (!darwin && !linux && !openbsd)) && !windows
+
+package gl
+
+// This file contains stub implementations of what the other work*.go files
+// provide. These stubs don't do anything, other than compile (e.g. when cgo is
+// disabled).
+
+type context struct{}
+
+func (*context) enqueue(c call) uintptr {
+	panic("unimplemented; GOOS/CGO combination not supported")
+}
+
+func (*context) cString(str string) (uintptr, func()) {
+	panic("unimplemented; GOOS/CGO combination not supported")
+}
+
+func (*context) cStringPtr(str string) (uintptr, func()) {
+	panic("unimplemented; GOOS/CGO combination not supported")
+}
+
+type context3 = context
+
+func NewContext() (Context, Worker) {
+	panic("unimplemented; GOOS/CGO combination not supported")
+}
+
+func Version() string {
+	panic("unimplemented; GOOS/CGO combination not supported")
+}

vendor/github.com/ebitengine/gomobile/gl/work_windows.go

@@ -0,0 +1,569 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gl
+
+import (
+	"runtime"
+	"syscall"
+	"unsafe"
+)
+
+// context is described in work.go.
+type context struct {
+	debug         int32
+	workAvailable chan struct{}
+	work          chan call
+	retvalue      chan uintptr
+
+	// TODO(crawshaw): will not work with a moving collector
+	cStringCounter int
+	cStrings       map[int]unsafe.Pointer
+}
+
+func (ctx *context) WorkAvailable() <-chan struct{} { return ctx.workAvailable }
+
+type context3 struct {
+	*context
+}
+
+func NewContext() (Context, Worker) {
+	if err := findDLLs(); err != nil {
+		panic(err)
+	}
+	glctx := &context{
+		workAvailable: make(chan struct{}, 1),
+		work:          make(chan call, 3),
+		retvalue:      make(chan uintptr),
+		cStrings:      make(map[int]unsafe.Pointer),
+	}
+	return glctx, glctx
+}
+
+func (ctx *context) enqueue(c call) uintptr {
+	ctx.work <- c
+
+	select {
+	case ctx.workAvailable <- struct{}{}:
+	default:
+	}
+
+	if c.blocking {
+		return <-ctx.retvalue
+	}
+	return 0
+}
+
+func (ctx *context) DoWork() {
+	// TODO: add a work queue
+	for {
+		select {
+		case w := <-ctx.work:
+			ret := ctx.doWork(w)
+			if w.blocking {
+				ctx.retvalue <- ret
+			}
+		default:
+			return
+		}
+	}
+}
+
+func (ctx *context) cString(s string) (uintptr, func()) {
+	buf := make([]byte, len(s)+1)
+	for i := 0; i < len(s); i++ {
+		buf[i] = s[i]
+	}
+	ret := unsafe.Pointer(&buf[0])
+	id := ctx.cStringCounter
+	ctx.cStringCounter++
+	ctx.cStrings[id] = ret
+	return uintptr(ret), func() { delete(ctx.cStrings, id) }
+}
+
+func (ctx *context) cStringPtr(str string) (uintptr, func()) {
+	s, sfree := ctx.cString(str)
+	sptr := [2]uintptr{s, 0}
+	ret := unsafe.Pointer(&sptr[0])
+	id := ctx.cStringCounter
+	ctx.cStringCounter++
+	ctx.cStrings[id] = ret
+	return uintptr(ret), func() { sfree(); delete(ctx.cStrings, id) }
+}
+
+// fixFloat copies the first four arguments into the XMM registers.
+// This is for the windows/amd64 calling convention, that wants
+// floating point arguments to be passed in XMM.
+//
+// Mercifully, type information is not required to implement
+// this calling convention. In particular see the mixed int/float
+// examples:
+//
+//	https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx
+//
+// This means it could be fixed in syscall.Syscall. The relevant
+// issue is
+//
+//	https://golang.org/issue/6510
+func fixFloat(x0, x1, x2, x3 uintptr)
+
+func (ctx *context) doWork(c call) (ret uintptr) {
+	if runtime.GOARCH == "amd64" {
+		fixFloat(c.args.a0, c.args.a1, c.args.a2, c.args.a3)
+	}
+
+	switch c.args.fn {
+	case glfnActiveTexture:
+		syscall.Syscall(glActiveTexture.Addr(), 1, c.args.a0, 0, 0)
+	case glfnAttachShader:
+		syscall.Syscall(glAttachShader.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBindAttribLocation:
+		syscall.Syscall(glBindAttribLocation.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnBindBuffer:
+		syscall.Syscall(glBindBuffer.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBindFramebuffer:
+		syscall.Syscall(glBindFramebuffer.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBindRenderbuffer:
+		syscall.Syscall(glBindRenderbuffer.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBindTexture:
+		syscall.Syscall(glBindTexture.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBindVertexArray:
+		syscall.Syscall(glBindVertexArray.Addr(), 1, c.args.a0, 0, 0)
+	case glfnBlendColor:
+		syscall.Syscall6(glBlendColor.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnBlendEquation:
+		syscall.Syscall(glBlendEquation.Addr(), 1, c.args.a0, 0, 0)
+	case glfnBlendEquationSeparate:
+		syscall.Syscall(glBlendEquationSeparate.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBlendFunc:
+		syscall.Syscall(glBlendFunc.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnBlendFuncSeparate:
+		syscall.Syscall6(glBlendFuncSeparate.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnBufferData:
+		syscall.Syscall6(glBufferData.Addr(), 4, c.args.a0, c.args.a1, uintptr(c.parg), c.args.a2, 0, 0)
+	case glfnBufferSubData:
+		syscall.Syscall6(glBufferSubData.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, uintptr(c.parg), 0, 0)
+	case glfnCheckFramebufferStatus:
+		ret, _, _ = syscall.Syscall(glCheckFramebufferStatus.Addr(), 1, c.args.a0, 0, 0)
+	case glfnClear:
+		syscall.Syscall(glClear.Addr(), 1, c.args.a0, 0, 0)
+	case glfnClearColor:
+		syscall.Syscall6(glClearColor.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnClearDepthf:
+		syscall.Syscall6(glClearDepthf.Addr(), 1, c.args.a0, 0, 0, 0, 0, 0)
+	case glfnClearStencil:
+		syscall.Syscall(glClearStencil.Addr(), 1, c.args.a0, 0, 0)
+	case glfnColorMask:
+		syscall.Syscall6(glColorMask.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnCompileShader:
+		syscall.Syscall(glCompileShader.Addr(), 1, c.args.a0, 0, 0)
+	case glfnCompressedTexImage2D:
+		syscall.Syscall9(glCompressedTexImage2D.Addr(), 8, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, c.args.a6, uintptr(c.parg), 0)
+	case glfnCompressedTexSubImage2D:
+		syscall.Syscall9(glCompressedTexSubImage2D.Addr(), 9, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, c.args.a6, c.args.a7, uintptr(c.parg))
+	case glfnCopyTexImage2D:
+		syscall.Syscall9(glCopyTexImage2D.Addr(), 8, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, c.args.a6, c.args.a7, 0)
+	case glfnCopyTexSubImage2D:
+		syscall.Syscall9(glCopyTexSubImage2D.Addr(), 8, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, c.args.a6, c.args.a7, 0)
+	case glfnCreateProgram:
+		ret, _, _ = syscall.Syscall(glCreateProgram.Addr(), 0, 0, 0, 0)
+	case glfnCreateShader:
+		ret, _, _ = syscall.Syscall(glCreateShader.Addr(), 1, c.args.a0, 0, 0)
+	case glfnCullFace:
+		syscall.Syscall(glCullFace.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDeleteBuffer:
+		syscall.Syscall(glDeleteBuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&c.args.a0)), 0)
+	case glfnDeleteFramebuffer:
+		syscall.Syscall(glDeleteFramebuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&c.args.a0)), 0)
+	case glfnDeleteProgram:
+		syscall.Syscall(glDeleteProgram.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDeleteRenderbuffer:
+		syscall.Syscall(glDeleteRenderbuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&c.args.a0)), 0)
+	case glfnDeleteShader:
+		syscall.Syscall(glDeleteShader.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDeleteVertexArray:
+		syscall.Syscall(glDeleteVertexArrays.Addr(), 2, 1, uintptr(unsafe.Pointer(&c.args.a0)), 0)
+	case glfnDeleteTexture:
+		syscall.Syscall(glDeleteTextures.Addr(), 2, 1, uintptr(unsafe.Pointer(&c.args.a0)), 0)
+	case glfnDepthFunc:
+		syscall.Syscall(glDepthFunc.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDepthRangef:
+		syscall.Syscall6(glDepthRangef.Addr(), 2, c.args.a0, c.args.a1, 0, 0, 0, 0)
+	case glfnDepthMask:
+		syscall.Syscall(glDepthMask.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDetachShader:
+		syscall.Syscall(glDetachShader.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnDisable:
+		syscall.Syscall(glDisable.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDisableVertexAttribArray:
+		syscall.Syscall(glDisableVertexAttribArray.Addr(), 1, c.args.a0, 0, 0)
+	case glfnDrawArrays:
+		syscall.Syscall(glDrawArrays.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnDrawElements:
+		syscall.Syscall6(glDrawElements.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnEnable:
+		syscall.Syscall(glEnable.Addr(), 1, c.args.a0, 0, 0)
+	case glfnEnableVertexAttribArray:
+		syscall.Syscall(glEnableVertexAttribArray.Addr(), 1, c.args.a0, 0, 0)
+	case glfnFinish:
+		syscall.Syscall(glFinish.Addr(), 0, 0, 0, 0)
+	case glfnFlush:
+		syscall.Syscall(glFlush.Addr(), 0, 0, 0, 0)
+	case glfnFramebufferRenderbuffer:
+		syscall.Syscall6(glFramebufferRenderbuffer.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnFramebufferTexture2D:
+		syscall.Syscall6(glFramebufferTexture2D.Addr(), 5, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, 0)
+	case glfnFrontFace:
+		syscall.Syscall(glFrontFace.Addr(), 1, c.args.a0, 0, 0)
+	case glfnGenBuffer:
+		syscall.Syscall(glGenBuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&ret)), 0)
+	case glfnGenFramebuffer:
+		syscall.Syscall(glGenFramebuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&ret)), 0)
+	case glfnGenRenderbuffer:
+		syscall.Syscall(glGenRenderbuffers.Addr(), 2, 1, uintptr(unsafe.Pointer(&ret)), 0)
+	case glfnGenVertexArray:
+		syscall.Syscall(glGenVertexArrays.Addr(), 2, 1, uintptr(unsafe.Pointer(&ret)), 0)
+	case glfnGenTexture:
+		syscall.Syscall(glGenTextures.Addr(), 2, 1, uintptr(unsafe.Pointer(&ret)), 0)
+	case glfnGenerateMipmap:
+		syscall.Syscall(glGenerateMipmap.Addr(), 1, c.args.a0, 0, 0)
+	case glfnGetActiveAttrib:
+		syscall.Syscall9(glGetActiveAttrib.Addr(), 7, c.args.a0, c.args.a1, c.args.a2, 0, uintptr(unsafe.Pointer(&ret)), c.args.a3, uintptr(c.parg), 0, 0)
+	case glfnGetActiveUniform:
+		syscall.Syscall9(glGetActiveUniform.Addr(), 7, c.args.a0, c.args.a1, c.args.a2, 0, uintptr(unsafe.Pointer(&ret)), c.args.a3, uintptr(c.parg), 0, 0)
+	case glfnGetAttachedShaders:
+		syscall.Syscall6(glGetAttachedShaders.Addr(), 4, c.args.a0, c.args.a1, uintptr(unsafe.Pointer(&ret)), uintptr(c.parg), 0, 0)
+	case glfnGetAttribLocation:
+		ret, _, _ = syscall.Syscall(glGetAttribLocation.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnGetBooleanv:
+		syscall.Syscall(glGetBooleanv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnGetBufferParameteri:
+		syscall.Syscall(glGetBufferParameteri.Addr(), 3, c.args.a0, c.args.a1, uintptr(unsafe.Pointer(&ret)))
+	case glfnGetError:
+		ret, _, _ = syscall.Syscall(glGetError.Addr(), 0, 0, 0, 0)
+	case glfnGetFloatv:
+		syscall.Syscall(glGetFloatv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnGetFramebufferAttachmentParameteriv:
+		syscall.Syscall6(glGetFramebufferAttachmentParameteriv.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, uintptr(unsafe.Pointer(&ret)), 0, 0)
+	case glfnGetIntegerv:
+		syscall.Syscall(glGetIntegerv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnGetProgramInfoLog:
+		syscall.Syscall6(glGetProgramInfoLog.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnGetProgramiv:
+		syscall.Syscall(glGetProgramiv.Addr(), 3, c.args.a0, c.args.a1, uintptr(unsafe.Pointer(&ret)))
+	case glfnGetRenderbufferParameteriv:
+		syscall.Syscall(glGetRenderbufferParameteriv.Addr(), 3, c.args.a0, c.args.a1, uintptr(unsafe.Pointer(&ret)))
+	case glfnGetShaderInfoLog:
+		syscall.Syscall6(glGetShaderInfoLog.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnGetShaderPrecisionFormat:
+		// c.parg is a [3]int32. The first [2]int32 of the array is one
+		// parameter, the final *int32 is another parameter.
+		syscall.Syscall6(glGetShaderPrecisionFormat.Addr(), 4, c.args.a0, c.args.a1, uintptr(c.parg), uintptr(c.parg)+2*unsafe.Sizeof(uintptr(0)), 0, 0)
+	case glfnGetShaderSource:
+		syscall.Syscall6(glGetShaderSource.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnGetShaderiv:
+		syscall.Syscall(glGetShaderiv.Addr(), 3, c.args.a0, c.args.a1, uintptr(unsafe.Pointer(&ret)))
+	case glfnGetString:
+		ret, _, _ = syscall.Syscall(glGetString.Addr(), 1, c.args.a0, 0, 0)
+	case glfnGetTexParameterfv:
+		syscall.Syscall(glGetTexParameterfv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnGetTexParameteriv:
+		syscall.Syscall(glGetTexParameteriv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnGetUniformLocation:
+		ret, _, _ = syscall.Syscall(glGetUniformLocation.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnGetUniformfv:
+		syscall.Syscall(glGetUniformfv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnGetUniformiv:
+		syscall.Syscall(glGetUniformiv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnGetVertexAttribfv:
+		syscall.Syscall(glGetVertexAttribfv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnGetVertexAttribiv:
+		syscall.Syscall(glGetVertexAttribiv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnHint:
+		syscall.Syscall(glHint.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnIsBuffer:
+		syscall.Syscall(glIsBuffer.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsEnabled:
+		syscall.Syscall(glIsEnabled.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsFramebuffer:
+		syscall.Syscall(glIsFramebuffer.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsProgram:
+		ret, _, _ = syscall.Syscall(glIsProgram.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsRenderbuffer:
+		syscall.Syscall(glIsRenderbuffer.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsShader:
+		syscall.Syscall(glIsShader.Addr(), 1, c.args.a0, 0, 0)
+	case glfnIsTexture:
+		syscall.Syscall(glIsTexture.Addr(), 1, c.args.a0, 0, 0)
+	case glfnLineWidth:
+		syscall.Syscall(glLineWidth.Addr(), 1, c.args.a0, 0, 0)
+	case glfnLinkProgram:
+		syscall.Syscall(glLinkProgram.Addr(), 1, c.args.a0, 0, 0)
+	case glfnPixelStorei:
+		syscall.Syscall(glPixelStorei.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnPolygonOffset:
+		syscall.Syscall6(glPolygonOffset.Addr(), 2, c.args.a0, c.args.a1, 0, 0, 0, 0)
+	case glfnReadPixels:
+		syscall.Syscall9(glReadPixels.Addr(), 7, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, uintptr(c.parg), 0, 0)
+	case glfnReleaseShaderCompiler:
+		syscall.Syscall(glReleaseShaderCompiler.Addr(), 0, 0, 0, 0)
+	case glfnRenderbufferStorage:
+		syscall.Syscall6(glRenderbufferStorage.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnSampleCoverage:
+		syscall.Syscall6(glSampleCoverage.Addr(), 1, c.args.a0, 0, 0, 0, 0, 0)
+	case glfnScissor:
+		syscall.Syscall6(glScissor.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnShaderSource:
+		syscall.Syscall6(glShaderSource.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, 0, 0, 0)
+	case glfnStencilFunc:
+		syscall.Syscall(glStencilFunc.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnStencilFuncSeparate:
+		syscall.Syscall6(glStencilFuncSeparate.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnStencilMask:
+		syscall.Syscall(glStencilMask.Addr(), 1, c.args.a0, 0, 0)
+	case glfnStencilMaskSeparate:
+		syscall.Syscall(glStencilMaskSeparate.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnStencilOp:
+		syscall.Syscall(glStencilOp.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnStencilOpSeparate:
+		syscall.Syscall6(glStencilOpSeparate.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnTexImage2D:
+		syscall.Syscall9(glTexImage2D.Addr(), 9, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, 0, c.args.a5, c.args.a6, uintptr(c.parg))
+	case glfnTexParameterf:
+		syscall.Syscall6(glTexParameterf.Addr(), 3, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnTexParameterfv:
+		syscall.Syscall(glTexParameterfv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnTexParameteri:
+		syscall.Syscall(glTexParameteri.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnTexParameteriv:
+		syscall.Syscall(glTexParameteriv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnTexSubImage2D:
+		syscall.Syscall9(glTexSubImage2D.Addr(), 9, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5, c.args.a6, c.args.a7, uintptr(c.parg))
+	case glfnUniform1f:
+		syscall.Syscall6(glUniform1f.Addr(), 2, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnUniform1fv:
+		syscall.Syscall(glUniform1fv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform1i:
+		syscall.Syscall(glUniform1i.Addr(), 2, c.args.a0, c.args.a1, 0)
+	case glfnUniform1iv:
+		syscall.Syscall(glUniform1iv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform2f:
+		syscall.Syscall6(glUniform2f.Addr(), 3, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnUniform2fv:
+		syscall.Syscall(glUniform2fv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform2i:
+		syscall.Syscall(glUniform2i.Addr(), 3, c.args.a0, c.args.a1, c.args.a2)
+	case glfnUniform2iv:
+		syscall.Syscall(glUniform2iv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform3f:
+		syscall.Syscall6(glUniform3f.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnUniform3fv:
+		syscall.Syscall(glUniform3fv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform3i:
+		syscall.Syscall6(glUniform3i.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	case glfnUniform3iv:
+		syscall.Syscall(glUniform3iv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform4f:
+		syscall.Syscall6(glUniform4f.Addr(), 5, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnUniform4fv:
+		syscall.Syscall(glUniform4fv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniform4i:
+		syscall.Syscall6(glUniform4i.Addr(), 5, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, 0)
+	case glfnUniform4iv:
+		syscall.Syscall(glUniform4iv.Addr(), 3, c.args.a0, c.args.a1, uintptr(c.parg))
+	case glfnUniformMatrix2fv:
+		syscall.Syscall6(glUniformMatrix2fv.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnUniformMatrix3fv:
+		syscall.Syscall6(glUniformMatrix3fv.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnUniformMatrix4fv:
+		syscall.Syscall6(glUniformMatrix4fv.Addr(), 4, c.args.a0, c.args.a1, 0, uintptr(c.parg), 0, 0)
+	case glfnUseProgram:
+		syscall.Syscall(glUseProgram.Addr(), 1, c.args.a0, 0, 0)
+	case glfnValidateProgram:
+		syscall.Syscall(glValidateProgram.Addr(), 1, c.args.a0, 0, 0)
+	case glfnVertexAttrib1f:
+		syscall.Syscall6(glVertexAttrib1f.Addr(), 2, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnVertexAttrib1fv:
+		syscall.Syscall(glVertexAttrib1fv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnVertexAttrib2f:
+		syscall.Syscall6(glVertexAttrib2f.Addr(), 3, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnVertexAttrib2fv:
+		syscall.Syscall(glVertexAttrib2fv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnVertexAttrib3f:
+		syscall.Syscall6(glVertexAttrib3f.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnVertexAttrib3fv:
+		syscall.Syscall(glVertexAttrib3fv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnVertexAttrib4f:
+		syscall.Syscall6(glVertexAttrib4f.Addr(), 5, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnVertexAttrib4fv:
+		syscall.Syscall(glVertexAttrib4fv.Addr(), 2, c.args.a0, uintptr(c.parg), 0)
+	case glfnVertexAttribPointer:
+		syscall.Syscall6(glVertexAttribPointer.Addr(), 6, c.args.a0, c.args.a1, c.args.a2, c.args.a3, c.args.a4, c.args.a5)
+	case glfnViewport:
+		syscall.Syscall6(glViewport.Addr(), 4, c.args.a0, c.args.a1, c.args.a2, c.args.a3, 0, 0)
+	default:
+		panic("unknown GL function")
+	}
+
+	return ret
+}
+
+// Exported libraries for a Windows GUI driver.
+//
+// LibEGL is not used directly by the gl package, but is needed by any
+// driver hoping to use OpenGL ES.
+//
+// LibD3DCompiler is needed by libglesv2.dll for compiling shaders.
+var (
+	LibGLESv2      = syscall.NewLazyDLL("libglesv2.dll")
+	LibEGL         = syscall.NewLazyDLL("libegl.dll")
+	LibD3DCompiler = syscall.NewLazyDLL("d3dcompiler_47.dll")
+)
+
+var (
+	libGLESv2                             = LibGLESv2
+	glActiveTexture                       = libGLESv2.NewProc("glActiveTexture")
+	glAttachShader                        = libGLESv2.NewProc("glAttachShader")
+	glBindAttribLocation                  = libGLESv2.NewProc("glBindAttribLocation")
+	glBindBuffer                          = libGLESv2.NewProc("glBindBuffer")
+	glBindFramebuffer                     = libGLESv2.NewProc("glBindFramebuffer")
+	glBindRenderbuffer                    = libGLESv2.NewProc("glBindRenderbuffer")
+	glBindTexture                         = libGLESv2.NewProc("glBindTexture")
+	glBindVertexArray                     = libGLESv2.NewProc("glBindVertexArray")
+	glBlendColor                          = libGLESv2.NewProc("glBlendColor")
+	glBlendEquation                       = libGLESv2.NewProc("glBlendEquation")
+	glBlendEquationSeparate               = libGLESv2.NewProc("glBlendEquationSeparate")
+	glBlendFunc                           = libGLESv2.NewProc("glBlendFunc")
+	glBlendFuncSeparate                   = libGLESv2.NewProc("glBlendFuncSeparate")
+	glBufferData                          = libGLESv2.NewProc("glBufferData")
+	glBufferSubData                       = libGLESv2.NewProc("glBufferSubData")
+	glCheckFramebufferStatus              = libGLESv2.NewProc("glCheckFramebufferStatus")
+	glClear                               = libGLESv2.NewProc("glClear")
+	glClearColor                          = libGLESv2.NewProc("glClearColor")
+	glClearDepthf                         = libGLESv2.NewProc("glClearDepthf")
+	glClearStencil                        = libGLESv2.NewProc("glClearStencil")
+	glColorMask                           = libGLESv2.NewProc("glColorMask")
+	glCompileShader                       = libGLESv2.NewProc("glCompileShader")
+	glCompressedTexImage2D                = libGLESv2.NewProc("glCompressedTexImage2D")
+	glCompressedTexSubImage2D             = libGLESv2.NewProc("glCompressedTexSubImage2D")
+	glCopyTexImage2D                      = libGLESv2.NewProc("glCopyTexImage2D")
+	glCopyTexSubImage2D                   = libGLESv2.NewProc("glCopyTexSubImage2D")
+	glCreateProgram                       = libGLESv2.NewProc("glCreateProgram")
+	glCreateShader                        = libGLESv2.NewProc("glCreateShader")
+	glCullFace                            = libGLESv2.NewProc("glCullFace")
+	glDeleteBuffers                       = libGLESv2.NewProc("glDeleteBuffers")
+	glDeleteFramebuffers                  = libGLESv2.NewProc("glDeleteFramebuffers")
+	glDeleteProgram                       = libGLESv2.NewProc("glDeleteProgram")
+	glDeleteRenderbuffers                 = libGLESv2.NewProc("glDeleteRenderbuffers")
+	glDeleteShader                        = libGLESv2.NewProc("glDeleteShader")
+	glDeleteTextures                      = libGLESv2.NewProc("glDeleteTextures")
+	glDeleteVertexArrays                  = libGLESv2.NewProc("glDeleteVertexArrays")
+	glDepthFunc                           = libGLESv2.NewProc("glDepthFunc")
+	glDepthRangef                         = libGLESv2.NewProc("glDepthRangef")
+	glDepthMask                           = libGLESv2.NewProc("glDepthMask")
+	glDetachShader                        = libGLESv2.NewProc("glDetachShader")
+	glDisable                             = libGLESv2.NewProc("glDisable")
+	glDisableVertexAttribArray            = libGLESv2.NewProc("glDisableVertexAttribArray")
+	glDrawArrays                          = libGLESv2.NewProc("glDrawArrays")
+	glDrawElements                        = libGLESv2.NewProc("glDrawElements")
+	glEnable                              = libGLESv2.NewProc("glEnable")
+	glEnableVertexAttribArray             = libGLESv2.NewProc("glEnableVertexAttribArray")
+	glFinish                              = libGLESv2.NewProc("glFinish")
+	glFlush                               = libGLESv2.NewProc("glFlush")
+	glFramebufferRenderbuffer             = libGLESv2.NewProc("glFramebufferRenderbuffer")
+	glFramebufferTexture2D                = libGLESv2.NewProc("glFramebufferTexture2D")
+	glFrontFace                           = libGLESv2.NewProc("glFrontFace")
+	glGenBuffers                          = libGLESv2.NewProc("glGenBuffers")
+	glGenFramebuffers                     = libGLESv2.NewProc("glGenFramebuffers")
+	glGenRenderbuffers                    = libGLESv2.NewProc("glGenRenderbuffers")
+	glGenTextures                         = libGLESv2.NewProc("glGenTextures")
+	glGenVertexArrays                     = libGLESv2.NewProc("glGenVertexArrays")
+	glGenerateMipmap                      = libGLESv2.NewProc("glGenerateMipmap")
+	glGetActiveAttrib                     = libGLESv2.NewProc("glGetActiveAttrib")
+	glGetActiveUniform                    = libGLESv2.NewProc("glGetActiveUniform")
+	glGetAttachedShaders                  = libGLESv2.NewProc("glGetAttachedShaders")
+	glGetAttribLocation                   = libGLESv2.NewProc("glGetAttribLocation")
+	glGetBooleanv                         = libGLESv2.NewProc("glGetBooleanv")
+	glGetBufferParameteri                 = libGLESv2.NewProc("glGetBufferParameteri")
+	glGetError                            = libGLESv2.NewProc("glGetError")
+	glGetFloatv                           = libGLESv2.NewProc("glGetFloatv")
+	glGetFramebufferAttachmentParameteriv = libGLESv2.NewProc("glGetFramebufferAttachmentParameteriv")
+	glGetIntegerv                         = libGLESv2.NewProc("glGetIntegerv")
+	glGetProgramInfoLog                   = libGLESv2.NewProc("glGetProgramInfoLog")
+	glGetProgramiv                        = libGLESv2.NewProc("glGetProgramiv")
+	glGetRenderbufferParameteriv          = libGLESv2.NewProc("glGetRenderbufferParameteriv")
+	glGetShaderInfoLog                    = libGLESv2.NewProc("glGetShaderInfoLog")
+	glGetShaderPrecisionFormat            = libGLESv2.NewProc("glGetShaderPrecisionFormat")
+	glGetShaderSource                     = libGLESv2.NewProc("glGetShaderSource")
+	glGetShaderiv                         = libGLESv2.NewProc("glGetShaderiv")
+	glGetString                           = libGLESv2.NewProc("glGetString")
+	glGetTexParameterfv                   = libGLESv2.NewProc("glGetTexParameterfv")
+	glGetTexParameteriv                   = libGLESv2.NewProc("glGetTexParameteriv")
+	glGetUniformLocation                  = libGLESv2.NewProc("glGetUniformLocation")
+	glGetUniformfv                        = libGLESv2.NewProc("glGetUniformfv")
+	glGetUniformiv                        = libGLESv2.NewProc("glGetUniformiv")
+	glGetVertexAttribfv                   = libGLESv2.NewProc("glGetVertexAttribfv")
+	glGetVertexAttribiv                   = libGLESv2.NewProc("glGetVertexAttribiv")
+	glHint                                = libGLESv2.NewProc("glHint")
+	glIsBuffer                            = libGLESv2.NewProc("glIsBuffer")
+	glIsEnabled                           = libGLESv2.NewProc("glIsEnabled")
+	glIsFramebuffer                       = libGLESv2.NewProc("glIsFramebuffer")
+	glIsProgram                           = libGLESv2.NewProc("glIsProgram")
+	glIsRenderbuffer                      = libGLESv2.NewProc("glIsRenderbuffer")
+	glIsShader                            = libGLESv2.NewProc("glIsShader")
+	glIsTexture                           = libGLESv2.NewProc("glIsTexture")
+	glLineWidth                           = libGLESv2.NewProc("glLineWidth")
+	glLinkProgram                         = libGLESv2.NewProc("glLinkProgram")
+	glPixelStorei                         = libGLESv2.NewProc("glPixelStorei")
+	glPolygonOffset                       = libGLESv2.NewProc("glPolygonOffset")
+	glReadPixels                          = libGLESv2.NewProc("glReadPixels")
+	glReleaseShaderCompiler               = libGLESv2.NewProc("glReleaseShaderCompiler")
+	glRenderbufferStorage                 = libGLESv2.NewProc("glRenderbufferStorage")
+	glSampleCoverage                      = libGLESv2.NewProc("glSampleCoverage")
+	glScissor                             = libGLESv2.NewProc("glScissor")
+	glShaderSource                        = libGLESv2.NewProc("glShaderSource")
+	glStencilFunc                         = libGLESv2.NewProc("glStencilFunc")
+	glStencilFuncSeparate                 = libGLESv2.NewProc("glStencilFuncSeparate")
+	glStencilMask                         = libGLESv2.NewProc("glStencilMask")
+	glStencilMaskSeparate                 = libGLESv2.NewProc("glStencilMaskSeparate")
+	glStencilOp                           = libGLESv2.NewProc("glStencilOp")
+	glStencilOpSeparate                   = libGLESv2.NewProc("glStencilOpSeparate")
+	glTexImage2D                          = libGLESv2.NewProc("glTexImage2D")
+	glTexParameterf                       = libGLESv2.NewProc("glTexParameterf")
+	glTexParameterfv                      = libGLESv2.NewProc("glTexParameterfv")
+	glTexParameteri                       = libGLESv2.NewProc("glTexParameteri")
+	glTexParameteriv                      = libGLESv2.NewProc("glTexParameteriv")
+	glTexSubImage2D                       = libGLESv2.NewProc("glTexSubImage2D")
+	glUniform1f                           = libGLESv2.NewProc("glUniform1f")
+	glUniform1fv                          = libGLESv2.NewProc("glUniform1fv")
+	glUniform1i                           = libGLESv2.NewProc("glUniform1i")
+	glUniform1iv                          = libGLESv2.NewProc("glUniform1iv")
+	glUniform2f                           = libGLESv2.NewProc("glUniform2f")
+	glUniform2fv                          = libGLESv2.NewProc("glUniform2fv")
+	glUniform2i                           = libGLESv2.NewProc("glUniform2i")
+	glUniform2iv                          = libGLESv2.NewProc("glUniform2iv")
+	glUniform3f                           = libGLESv2.NewProc("glUniform3f")
+	glUniform3fv                          = libGLESv2.NewProc("glUniform3fv")
+	glUniform3i                           = libGLESv2.NewProc("glUniform3i")
+	glUniform3iv                          = libGLESv2.NewProc("glUniform3iv")
+	glUniform4f                           = libGLESv2.NewProc("glUniform4f")
+	glUniform4fv                          = libGLESv2.NewProc("glUniform4fv")
+	glUniform4i                           = libGLESv2.NewProc("glUniform4i")
+	glUniform4iv                          = libGLESv2.NewProc("glUniform4iv")
+	glUniformMatrix2fv                    = libGLESv2.NewProc("glUniformMatrix2fv")
+	glUniformMatrix3fv                    = libGLESv2.NewProc("glUniformMatrix3fv")
+	glUniformMatrix4fv                    = libGLESv2.NewProc("glUniformMatrix4fv")
+	glUseProgram                          = libGLESv2.NewProc("glUseProgram")
+	glValidateProgram                     = libGLESv2.NewProc("glValidateProgram")
+	glVertexAttrib1f                      = libGLESv2.NewProc("glVertexAttrib1f")
+	glVertexAttrib1fv                     = libGLESv2.NewProc("glVertexAttrib1fv")
+	glVertexAttrib2f                      = libGLESv2.NewProc("glVertexAttrib2f")
+	glVertexAttrib2fv                     = libGLESv2.NewProc("glVertexAttrib2fv")
+	glVertexAttrib3f                      = libGLESv2.NewProc("glVertexAttrib3f")
+	glVertexAttrib3fv                     = libGLESv2.NewProc("glVertexAttrib3fv")
+	glVertexAttrib4f                      = libGLESv2.NewProc("glVertexAttrib4f")
+	glVertexAttrib4fv                     = libGLESv2.NewProc("glVertexAttrib4fv")
+	glVertexAttribPointer                 = libGLESv2.NewProc("glVertexAttribPointer")
+	glViewport                            = libGLESv2.NewProc("glViewport")
+)

vendor/github.com/ebitengine/gomobile/gl/work_windows_386.s

@@ -0,0 +1,9 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+// fixFloat is unnecessary for windows/386
+TEXT ·fixFloat(SB),NOSPLIT,$0-16
+	RET

vendor/github.com/ebitengine/gomobile/gl/work_windows_amd64.s

@@ -0,0 +1,12 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT ·fixFloat(SB),NOSPLIT,$0-32
+	MOVQ 	x0+0(FP), X0
+	MOVQ	x1+8(FP), X1
+	MOVQ	x2+16(FP), X2
+	MOVQ	x3+24(FP), X3
+	RET

vendor/github.com/ebitengine/gomobile/internal/mobileinit/ctx_android.go

@@ -0,0 +1,124 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mobileinit
+
+/*
+#include <jni.h>
+#include <stdlib.h>
+
+static char* lockJNI(JavaVM *vm, uintptr_t* envp, int* attachedp) {
+	JNIEnv* env;
+
+	if (vm == NULL) {
+		return "no current JVM";
+	}
+
+	*attachedp = 0;
+	switch ((*vm)->GetEnv(vm, (void**)&env, JNI_VERSION_1_6)) {
+	case JNI_OK:
+		break;
+	case JNI_EDETACHED:
+		if ((*vm)->AttachCurrentThread(vm, &env, 0) != 0) {
+			return "cannot attach to JVM";
+		}
+		*attachedp = 1;
+		break;
+	case JNI_EVERSION:
+		return "bad JNI version";
+	default:
+		return "unknown JNI error from GetEnv";
+	}
+
+	*envp = (uintptr_t)env;
+	return NULL;
+}
+
+static char* checkException(uintptr_t jnienv) {
+	jthrowable exc;
+	JNIEnv* env = (JNIEnv*)jnienv;
+
+	if (!(*env)->ExceptionCheck(env)) {
+		return NULL;
+	}
+
+	exc = (*env)->ExceptionOccurred(env);
+	(*env)->ExceptionClear(env);
+
+	jclass clazz = (*env)->FindClass(env, "java/lang/Throwable");
+	jmethodID toString = (*env)->GetMethodID(env, clazz, "toString", "()Ljava/lang/String;");
+	jobject msgStr = (*env)->CallObjectMethod(env, exc, toString);
+	return (char*)(*env)->GetStringUTFChars(env, msgStr, 0);
+}
+
+static void unlockJNI(JavaVM *vm) {
+	(*vm)->DetachCurrentThread(vm);
+}
+*/
+import "C"
+
+import (
+	"errors"
+	"runtime"
+	"unsafe"
+)
+
+// currentVM is stored to initialize other cgo packages.
+//
+// As all the Go packages in a program form a single shared library,
+// there can only be one JNI_OnLoad function for initialization. In
+// OpenJDK there is JNI_GetCreatedJavaVMs, but this is not available
+// on android.
+var currentVM *C.JavaVM
+
+// currentCtx is Android's android.context.Context. May be NULL.
+var currentCtx C.jobject
+
+// SetCurrentContext populates the global Context object with the specified
+// current JavaVM instance (vm) and android.context.Context object (ctx).
+// The android.context.Context object must be a global reference.
+func SetCurrentContext(vm unsafe.Pointer, ctx uintptr) {
+	currentVM = (*C.JavaVM)(vm)
+	currentCtx = (C.jobject)(ctx)
+}
+
+// RunOnJVM runs fn on a new goroutine locked to an OS thread with a JNIEnv.
+//
+// RunOnJVM blocks until the call to fn is complete. Any Java
+// exception or failure to attach to the JVM is returned as an error.
+//
+// The function fn takes vm, the current JavaVM*,
+// env, the current JNIEnv*, and
+// ctx, a jobject representing the global android.context.Context.
+func RunOnJVM(fn func(vm, env, ctx uintptr) error) error {
+	errch := make(chan error)
+	go func() {
+		runtime.LockOSThread()
+		defer runtime.UnlockOSThread()
+
+		env := C.uintptr_t(0)
+		attached := C.int(0)
+		if errStr := C.lockJNI(currentVM, &env, &attached); errStr != nil {
+			errch <- errors.New(C.GoString(errStr))
+			return
+		}
+		if attached != 0 {
+			defer C.unlockJNI(currentVM)
+		}
+
+		vm := uintptr(unsafe.Pointer(currentVM))
+		if err := fn(vm, uintptr(env), uintptr(currentCtx)); err != nil {
+			errch <- err
+			return
+		}
+
+		if exc := C.checkException(env); exc != nil {
+			errch <- errors.New(C.GoString(exc))
+			C.free(unsafe.Pointer(exc))
+			return
+		}
+		errch <- nil
+	}()
+	return <-errch
+}

vendor/github.com/ebitengine/gomobile/internal/mobileinit/mobileinit.go

@@ -0,0 +1,11 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package mobileinit contains common initialization logic for mobile platforms
+// that is relevant to both all-Go apps and gobind-based apps.
+//
+// Long-term, some code in this package should consider moving into Go stdlib.
+package mobileinit
+
+import "C"

vendor/github.com/ebitengine/gomobile/internal/mobileinit/mobileinit_android.go

@@ -0,0 +1,93 @@
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mobileinit
+
+/*
+To view the log output run:
+adb logcat GoLog:I *:S
+*/
+
+// Android redirects stdout and stderr to /dev/null.
+// As these are common debugging utilities in Go,
+// we redirect them to logcat.
+//
+// Unfortunately, logcat is line oriented, so we must buffer.
+
+/*
+#cgo LDFLAGS: -landroid -llog
+
+#include <android/log.h>
+#include <stdlib.h>
+#include <string.h>
+*/
+import "C"
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+var (
+	ctag = C.CString("GoLog")
+	// Store the writer end of the redirected stderr and stdout
+	// so that they are not garbage collected and closed.
+	stderr, stdout *os.File
+)
+
+type infoWriter struct{}
+
+func (infoWriter) Write(p []byte) (n int, err error) {
+	cstr := C.CString(string(p))
+	C.__android_log_write(C.ANDROID_LOG_INFO, ctag, cstr)
+	C.free(unsafe.Pointer(cstr))
+	return len(p), nil
+}
+
+func lineLog(f *os.File, priority C.int) {
+	const logSize = 1024 // matches android/log.h.
+	r := bufio.NewReaderSize(f, logSize)
+	for {
+		line, _, err := r.ReadLine()
+		str := string(line)
+		if err != nil {
+			str += " " + err.Error()
+		}
+		cstr := C.CString(str)
+		C.__android_log_write(priority, ctag, cstr)
+		C.free(unsafe.Pointer(cstr))
+		if err != nil {
+			break
+		}
+	}
+}
+
+func init() {
+	log.SetOutput(infoWriter{})
+	// android logcat includes all of log.LstdFlags
+	log.SetFlags(log.Flags() &^ log.LstdFlags)
+
+	r, w, err := os.Pipe()
+	if err != nil {
+		panic(err)
+	}
+	stderr = w
+	if err := syscall.Dup3(int(w.Fd()), int(os.Stderr.Fd()), 0); err != nil {
+		panic(err)
+	}
+	go lineLog(r, C.ANDROID_LOG_ERROR)
+
+	r, w, err = os.Pipe()
+	if err != nil {
+		panic(err)
+	}
+	stdout = w
+	if err := syscall.Dup3(int(w.Fd()), int(os.Stdout.Fd()), 0); err != nil {
+		panic(err)
+	}
+	go lineLog(r, C.ANDROID_LOG_INFO)
+}

vendor/github.com/ebitengine/gomobile/internal/mobileinit/mobileinit_ios.go

@@ -0,0 +1,41 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package mobileinit
+
+import (
+	"io"
+	"log"
+	"os"
+	"unsafe"
+)
+
+/*
+#include <stdlib.h>
+#include <os/log.h>
+
+os_log_t create_os_log() {
+	return os_log_create("org.golang.mobile", "os_log");
+}
+
+void os_log_wrap(os_log_t log, const char *str) {
+	os_log(log, "%s", str);
+}
+*/
+import "C"
+
+type osWriter struct {
+	w C.os_log_t
+}
+
+func (o osWriter) Write(p []byte) (n int, err error) {
+	cstr := C.CString(string(p))
+	C.os_log_wrap(o.w, cstr)
+	C.free(unsafe.Pointer(cstr))
+	return len(p), nil
+}
+
+func init() {
+	log.SetOutput(io.MultiWriter(os.Stderr, osWriter{C.create_os_log()}))
+}

vendor/github.com/ebitengine/hideconsole/.gitignore

@@ -0,0 +1 @@
+*~

vendor/github.com/ebitengine/hideconsole/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "{}"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright {yyyy} {name of copyright owner}
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/ebitengine/hideconsole/README.md

@@ -0,0 +1,15 @@
+# HideConsole
+
+Package hideconsole is a utility package to hide a console automatically even without `-ldflags "-Hwindowsgui"` on Windows.
+
+On non-Windows, this package does nothing.
+
+## Usage
+
+Import this package with a blank identifier.
+
+```go
+import (
+    _ "github.com/ebitengine/hideconsole"
+)
+```

vendor/github.com/ebitengine/hideconsole/doc.go

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
+
+// Package hideconsole is a utility package to hide a console automatically
+// even without `-ldflags "-Hwindowsgui"` on Windows.
+//
+// On non-Windows, this package does nothing.
+//
+// # Usage
+//
+// Import this package with a blank identifier:
+//
+//	import (
+//		_ "github.com/ebitengine/hideconsole"
+//	)
+package hideconsole

vendor/github.com/ebitengine/hideconsole/hideconsole_windows.go

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
+
+package hideconsole
+
+import (
+	"fmt"
+
+	"golang.org/x/sys/windows"
+)
+
+var (
+	kernel32 = windows.NewLazySystemDLL("kernel32.dll")
+	user32   = windows.NewLazySystemDLL("user32.dll")
+
+	procFreeConsoleWindow = kernel32.NewProc("FreeConsole")
+	procGetConsoleWindow  = kernel32.NewProc("GetConsoleWindow")
+)
+
+func freeConsole() error {
+	r, _, e := procFreeConsoleWindow.Call()
+	if int32(r) == 0 {
+		if e != nil && e != windows.ERROR_SUCCESS {
+			return fmt.Errorf("FreeConsole failed: %w", e)
+		}
+		return fmt.Errorf("FreeConsole returned 0")
+	}
+	return nil
+}
+
+func getConsoleWindow() windows.HWND {
+	r, _, _ := procGetConsoleWindow.Call()
+	return windows.HWND(r)
+}
+
+// hideConsoleWindow will hide the console window that is showing when
+// compiling on Windows without specifying the '-ldflags "-Hwindowsgui"' flag.
+func hideConsoleWindow() {
+	// In Xbox, GetWindowThreadProcessId might not exist.
+	if user32.NewProc("GetWindowThreadProcessId").Find() != nil {
+		return
+	}
+
+	pid := windows.GetCurrentProcessId()
+
+	// Get the process ID of the console's creator.
+	var cpid uint32
+	if _, err := windows.GetWindowThreadProcessId(getConsoleWindow(), &cpid); err != nil {
+		// Even if closing the console fails, this is not harmful.
+		// Ignore error.
+		return
+	}
+
+	if pid == cpid {
+		// The current process created its own console. Hide this.
+		// Ignore error.
+		_ = freeConsole()
+	}
+}
+
+func init() {
+	hideConsoleWindow()
+}

vendor/github.com/ebitengine/purego/.gitignore

@@ -0,0 +1 @@
+*~

vendor/github.com/ebitengine/purego/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
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+
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+
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+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/ebitengine/purego/README.md

@@ -0,0 +1,96 @@
+# purego
+[![Go Reference](https://pkg.go.dev/badge/github.com/ebitengine/purego?GOOS=darwin.svg)](https://pkg.go.dev/github.com/ebitengine/purego?GOOS=darwin)
+
+A library for calling C functions from Go without Cgo.
+
+> This is beta software so expect bugs and potentially API breaking changes
+> but each release will be tagged to avoid breaking people's code.
+> Bug reports are encouraged.
+
+## Motivation
+
+The [Ebitengine](https://github.com/hajimehoshi/ebiten) game engine was ported to use only Go on Windows. This enabled
+cross-compiling to Windows from any other operating system simply by setting `GOOS=windows`. The purego project was
+born to bring that same vision to the other platforms supported by Ebitengine.
+
+## Benefits
+
+- **Simple Cross-Compilation**: No C means you can build for other platforms easily without a C compiler.
+- **Faster Compilation**: Efficiently cache your entirely Go builds.
+- **Smaller Binaries**: Using Cgo generates a C wrapper function for each C function called. Purego doesn't!
+- **Dynamic Linking**: Load symbols at runtime and use it as a plugin system.
+- **Foreign Function Interface**: Call into other languages that are compiled into shared objects.
+- **Cgo Fallback**: Works even with CGO_ENABLED=1 so incremental porting is possible. 
+This also means unsupported GOARCHs (freebsd/riscv64, linux/mips, etc.) will still work
+except for float arguments and return values.
+
+## Supported Platforms
+
+- **FreeBSD**: amd64, arm64
+- **Linux**: amd64, arm64
+- **macOS / iOS**: amd64, arm64
+- **Windows**: 386*, amd64, arm*, arm64
+
+`*` These architectures only support SyscallN and NewCallback
+
+## Example
+
+This example only works on macOS and Linux. For a complete example look at [libc](https://github.com/ebitengine/purego/tree/main/examples/libc) which supports Windows and FreeBSD.
+
+```go
+package main
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/ebitengine/purego"
+)
+
+func getSystemLibrary() string {
+	switch runtime.GOOS {
+	case "darwin":
+		return "/usr/lib/libSystem.B.dylib"
+	case "linux":
+		return "libc.so.6"
+	default:
+		panic(fmt.Errorf("GOOS=%s is not supported", runtime.GOOS))
+	}
+}
+
+func main() {
+	libc, err := purego.Dlopen(getSystemLibrary(), purego.RTLD_NOW|purego.RTLD_GLOBAL)
+	if err != nil {
+		panic(err)
+	}
+	var puts func(string)
+	purego.RegisterLibFunc(&puts, libc, "puts")
+	puts("Calling C from Go without Cgo!")
+}
+```
+
+Then to run: `CGO_ENABLED=0 go run main.go`
+
+## Questions
+
+If you have questions about how to incorporate purego in your project or want to discuss
+how it works join the [Discord](https://discord.com/channels/842049801528016967/1123106378731487345)!
+
+### External Code
+
+Purego uses code that originates from the Go runtime. These files are under the BSD-3
+License that can be found [in the Go Source](https://github.com/golang/go/blob/master/LICENSE).
+This is a list of the copied files:
+
+* `abi_*.h` from package `runtime/cgo`
+* `zcallback_darwin_*.s` from package `runtime`
+* `internal/fakecgo/abi_*.h` from package `runtime/cgo`
+* `internal/fakecgo/asm_GOARCH.s` from package `runtime/cgo`
+* `internal/fakecgo/callbacks.go` from package `runtime/cgo`
+* `internal/fakecgo/go_GOOS_GOARCH.go` from package `runtime/cgo`
+* `internal/fakecgo/iscgo.go` from package `runtime/cgo`
+* `internal/fakecgo/setenv.go` from package `runtime/cgo`
+* `internal/fakecgo/freebsd.go` from package `runtime/cgo`
+
+The files `abi_*.h` and `internal/fakecgo/abi_*.h` are the same because Bazel does not support cross-package use of
+`#include` so we need each one once per package. (cf. [issue](https://github.com/bazelbuild/rules_go/issues/3636))

vendor/github.com/ebitengine/purego/abi_amd64.h

@@ -0,0 +1,99 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Macros for transitioning from the host ABI to Go ABI0.
+//
+// These save the frame pointer, so in general, functions that use
+// these should have zero frame size to suppress the automatic frame
+// pointer, though it's harmless to not do this.
+
+#ifdef GOOS_windows
+
+// REGS_HOST_TO_ABI0_STACK is the stack bytes used by
+// PUSH_REGS_HOST_TO_ABI0.
+#define REGS_HOST_TO_ABI0_STACK (28*8 + 8)
+
+// PUSH_REGS_HOST_TO_ABI0 prepares for transitioning from
+// the host ABI to Go ABI0 code. It saves all registers that are
+// callee-save in the host ABI and caller-save in Go ABI0 and prepares
+// for entry to Go.
+//
+// Save DI SI BP BX R12 R13 R14 R15 X6-X15 registers and the DF flag.
+// Clear the DF flag for the Go ABI.
+// MXCSR matches the Go ABI, so we don't have to set that,
+// and Go doesn't modify it, so we don't have to save it.
+#define PUSH_REGS_HOST_TO_ABI0()	\
+	PUSHFQ			\
+	CLD			\
+	ADJSP	$(REGS_HOST_TO_ABI0_STACK - 8)	\
+	MOVQ	DI, (0*0)(SP)	\
+	MOVQ	SI, (1*8)(SP)	\
+	MOVQ	BP, (2*8)(SP)	\
+	MOVQ	BX, (3*8)(SP)	\
+	MOVQ	R12, (4*8)(SP)	\
+	MOVQ	R13, (5*8)(SP)	\
+	MOVQ	R14, (6*8)(SP)	\
+	MOVQ	R15, (7*8)(SP)	\
+	MOVUPS	X6, (8*8)(SP)	\
+	MOVUPS	X7, (10*8)(SP)	\
+	MOVUPS	X8, (12*8)(SP)	\
+	MOVUPS	X9, (14*8)(SP)	\
+	MOVUPS	X10, (16*8)(SP)	\
+	MOVUPS	X11, (18*8)(SP)	\
+	MOVUPS	X12, (20*8)(SP)	\
+	MOVUPS	X13, (22*8)(SP)	\
+	MOVUPS	X14, (24*8)(SP)	\
+	MOVUPS	X15, (26*8)(SP)
+
+#define POP_REGS_HOST_TO_ABI0()	\
+	MOVQ	(0*0)(SP), DI	\
+	MOVQ	(1*8)(SP), SI	\
+	MOVQ	(2*8)(SP), BP	\
+	MOVQ	(3*8)(SP), BX	\
+	MOVQ	(4*8)(SP), R12	\
+	MOVQ	(5*8)(SP), R13	\
+	MOVQ	(6*8)(SP), R14	\
+	MOVQ	(7*8)(SP), R15	\
+	MOVUPS	(8*8)(SP), X6	\
+	MOVUPS	(10*8)(SP), X7	\
+	MOVUPS	(12*8)(SP), X8	\
+	MOVUPS	(14*8)(SP), X9	\
+	MOVUPS	(16*8)(SP), X10	\
+	MOVUPS	(18*8)(SP), X11	\
+	MOVUPS	(20*8)(SP), X12	\
+	MOVUPS	(22*8)(SP), X13	\
+	MOVUPS	(24*8)(SP), X14	\
+	MOVUPS	(26*8)(SP), X15	\
+	ADJSP	$-(REGS_HOST_TO_ABI0_STACK - 8)	\
+	POPFQ
+
+#else
+// SysV ABI
+
+#define REGS_HOST_TO_ABI0_STACK (6*8)
+
+// SysV MXCSR matches the Go ABI, so we don't have to set that,
+// and Go doesn't modify it, so we don't have to save it.
+// Both SysV and Go require DF to be cleared, so that's already clear.
+// The SysV and Go frame pointer conventions are compatible.
+#define PUSH_REGS_HOST_TO_ABI0()	\
+	ADJSP	$(REGS_HOST_TO_ABI0_STACK)	\
+	MOVQ	BP, (5*8)(SP)	\
+	LEAQ	(5*8)(SP), BP	\
+	MOVQ	BX, (0*8)(SP)	\
+	MOVQ	R12, (1*8)(SP)	\
+	MOVQ	R13, (2*8)(SP)	\
+	MOVQ	R14, (3*8)(SP)	\
+	MOVQ	R15, (4*8)(SP)
+
+#define POP_REGS_HOST_TO_ABI0()	\
+	MOVQ	(0*8)(SP), BX	\
+	MOVQ	(1*8)(SP), R12	\
+	MOVQ	(2*8)(SP), R13	\
+	MOVQ	(3*8)(SP), R14	\
+	MOVQ	(4*8)(SP), R15	\
+	MOVQ	(5*8)(SP), BP	\
+	ADJSP	$-(REGS_HOST_TO_ABI0_STACK)
+
+#endif

vendor/github.com/ebitengine/purego/abi_arm64.h

@@ -0,0 +1,39 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Macros for transitioning from the host ABI to Go ABI0.
+//
+// These macros save and restore the callee-saved registers
+// from the stack, but they don't adjust stack pointer, so
+// the user should prepare stack space in advance.
+// SAVE_R19_TO_R28(offset) saves R19 ~ R28 to the stack space
+// of ((offset)+0*8)(RSP) ~ ((offset)+9*8)(RSP).
+//
+// SAVE_F8_TO_F15(offset) saves F8 ~ F15 to the stack space
+// of ((offset)+0*8)(RSP) ~ ((offset)+7*8)(RSP).
+//
+// R29 is not saved because Go will save and restore it.
+
+#define SAVE_R19_TO_R28(offset) \
+	STP	(R19, R20), ((offset)+0*8)(RSP) \
+	STP	(R21, R22), ((offset)+2*8)(RSP) \
+	STP	(R23, R24), ((offset)+4*8)(RSP) \
+	STP	(R25, R26), ((offset)+6*8)(RSP) \
+	STP	(R27, g), ((offset)+8*8)(RSP)
+#define RESTORE_R19_TO_R28(offset) \
+	LDP	((offset)+0*8)(RSP), (R19, R20) \
+	LDP	((offset)+2*8)(RSP), (R21, R22) \
+	LDP	((offset)+4*8)(RSP), (R23, R24) \
+	LDP	((offset)+6*8)(RSP), (R25, R26) \
+	LDP	((offset)+8*8)(RSP), (R27, g) /* R28 */
+#define SAVE_F8_TO_F15(offset) \
+	FSTPD	(F8, F9), ((offset)+0*8)(RSP) \
+	FSTPD	(F10, F11), ((offset)+2*8)(RSP) \
+	FSTPD	(F12, F13), ((offset)+4*8)(RSP) \
+	FSTPD	(F14, F15), ((offset)+6*8)(RSP)
+#define RESTORE_F8_TO_F15(offset) \
+	FLDPD	((offset)+0*8)(RSP), (F8, F9) \
+	FLDPD	((offset)+2*8)(RSP), (F10, F11) \
+	FLDPD	((offset)+4*8)(RSP), (F12, F13) \
+	FLDPD	((offset)+6*8)(RSP), (F14, F15)

vendor/github.com/ebitengine/purego/cgo.go

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build cgo && (darwin || freebsd || linux)
+
+package purego
+
+// if CGO_ENABLED=1 import the Cgo runtime to ensure that it is set up properly.
+// This is required since some frameworks need TLS setup the C way which Go doesn't do.
+// We currently don't support ios in fakecgo mode so force Cgo or fail
+// Even if CGO_ENABLED=1 the Cgo runtime is not imported unless `import "C"` is used.
+// which will import this package automatically. Normally this isn't an issue since it
+// usually isn't possible to call into C without using that import. However, with purego
+// it is since we don't use `import "C"`!
+import (
+	_ "runtime/cgo"
+
+	_ "github.com/ebitengine/purego/internal/cgo"
+)

vendor/github.com/ebitengine/purego/dlerror.go

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2023 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package purego
+
+// Dlerror represents an error value returned from Dlopen, Dlsym, or Dlclose.
+type Dlerror struct {
+	s string
+}
+
+func (e Dlerror) Error() string {
+	return e.s
+}

vendor/github.com/ebitengine/purego/dlfcn.go

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package purego
+
+import (
+	"unsafe"
+)
+
+// Unix Specification for dlfcn.h: https://pubs.opengroup.org/onlinepubs/7908799/xsh/dlfcn.h.html
+
+var (
+	fnDlopen  func(path string, mode int) uintptr
+	fnDlsym   func(handle uintptr, name string) uintptr
+	fnDlerror func() string
+	fnDlclose func(handle uintptr) bool
+)
+
+func init() {
+	RegisterFunc(&fnDlopen, dlopenABI0)
+	RegisterFunc(&fnDlsym, dlsymABI0)
+	RegisterFunc(&fnDlerror, dlerrorABI0)
+	RegisterFunc(&fnDlclose, dlcloseABI0)
+}
+
+// Dlopen examines the dynamic library or bundle file specified by path. If the file is compatible
+// with the current process and has not already been loaded into the
+// current process, it is loaded and linked. After being linked, if it contains
+// any initializer functions, they are called, before Dlopen
+// returns. It returns a handle that can be used with Dlsym and Dlclose.
+// A second call to Dlopen with the same path will return the same handle, but the internal
+// reference count for the handle will be incremented. Therefore, all
+// Dlopen calls should be balanced with a Dlclose call.
+func Dlopen(path string, mode int) (uintptr, error) {
+	u := fnDlopen(path, mode)
+	if u == 0 {
+		return 0, Dlerror{fnDlerror()}
+	}
+	return u, nil
+}
+
+// Dlsym takes a "handle" of a dynamic library returned by Dlopen and the symbol name.
+// It returns the address where that symbol is loaded into memory. If the symbol is not found,
+// in the specified library or any of the libraries that were automatically loaded by Dlopen
+// when that library was loaded, Dlsym returns zero.
+func Dlsym(handle uintptr, name string) (uintptr, error) {
+	u := fnDlsym(handle, name)
+	if u == 0 {
+		return 0, Dlerror{fnDlerror()}
+	}
+	return u, nil
+}
+
+// Dlclose decrements the reference count on the dynamic library handle.
+// If the reference count drops to zero and no other loaded libraries
+// use symbols in it, then the dynamic library is unloaded.
+func Dlclose(handle uintptr) error {
+	if fnDlclose(handle) {
+		return Dlerror{fnDlerror()}
+	}
+	return nil
+}
+
+//go:linkname openLibrary openLibrary
+func openLibrary(name string) (uintptr, error) {
+	return Dlopen(name, RTLD_NOW|RTLD_GLOBAL)
+}
+
+func loadSymbol(handle uintptr, name string) (uintptr, error) {
+	return Dlsym(handle, name)
+}
+
+// these functions exist in dlfcn_stubs.s and are calling C functions linked to in dlfcn_GOOS.go
+// the indirection is necessary because a function is actually a pointer to the pointer to the code.
+// sadly, I do not know of anyway to remove the assembly stubs entirely because //go:linkname doesn't
+// appear to work if you link directly to the C function on darwin arm64.
+
+//go:linkname dlopen dlopen
+var dlopen uintptr
+var dlopenABI0 = uintptr(unsafe.Pointer(&dlopen))
+
+//go:linkname dlsym dlsym
+var dlsym uintptr
+var dlsymABI0 = uintptr(unsafe.Pointer(&dlsym))
+
+//go:linkname dlclose dlclose
+var dlclose uintptr
+var dlcloseABI0 = uintptr(unsafe.Pointer(&dlclose))
+
+//go:linkname dlerror dlerror
+var dlerror uintptr
+var dlerrorABI0 = uintptr(unsafe.Pointer(&dlerror))

vendor/github.com/ebitengine/purego/dlfcn_darwin.go

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package purego
+
+// Source for constants: https://opensource.apple.com/source/dyld/dyld-360.14/include/dlfcn.h.auto.html
+
+const (
+	RTLD_DEFAULT = ^uintptr(0) - 1 // Pseudo-handle for dlsym so search for any loaded symbol
+	RTLD_LAZY    = 0x1             // Relocations are performed at an implementation-dependent time.
+	RTLD_NOW     = 0x2             // Relocations are performed when the object is loaded.
+	RTLD_LOCAL   = 0x4             // All symbols are not made available for relocation processing by other modules.
+	RTLD_GLOBAL  = 0x8             // All symbols are available for relocation processing of other modules.
+)
+
+//go:cgo_import_dynamic purego_dlopen dlopen "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlsym dlsym "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlerror dlerror "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlclose dlclose "/usr/lib/libSystem.B.dylib"
+
+//go:cgo_import_dynamic purego_dlopen dlopen "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlsym dlsym "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlerror dlerror "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_dlclose dlclose "/usr/lib/libSystem.B.dylib"

vendor/github.com/ebitengine/purego/dlfcn_freebsd.go

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package purego
+
+// Constants as defined in https://github.com/freebsd/freebsd-src/blob/main/include/dlfcn.h
+const (
+	RTLD_DEFAULT = ^uintptr(0) - 2 // Pseudo-handle for dlsym so search for any loaded symbol
+	RTLD_LAZY    = 0x00001         // Relocations are performed at an implementation-dependent time.
+	RTLD_NOW     = 0x00002         // Relocations are performed when the object is loaded.
+	RTLD_LOCAL   = 0x00000         // All symbols are not made available for relocation processing by other modules.
+	RTLD_GLOBAL  = 0x00100         // All symbols are available for relocation processing of other modules.
+)

vendor/github.com/ebitengine/purego/dlfcn_linux.go

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package purego
+
+// Source for constants: https://codebrowser.dev/glibc/glibc/bits/dlfcn.h.html
+
+const (
+	RTLD_DEFAULT = 0x00000 // Pseudo-handle for dlsym so search for any loaded symbol
+	RTLD_LAZY    = 0x00001 // Relocations are performed at an implementation-dependent time.
+	RTLD_NOW     = 0x00002 // Relocations are performed when the object is loaded.
+	RTLD_LOCAL   = 0x00000 // All symbols are not made available for relocation processing by other modules.
+	RTLD_GLOBAL  = 0x00100 // All symbols are available for relocation processing of other modules.
+)

vendor/github.com/ebitengine/purego/dlfcn_nocgo_freebsd.go

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build !cgo
+
+package purego
+
+//go:cgo_import_dynamic purego_dlopen dlopen "libc.so.7"
+//go:cgo_import_dynamic purego_dlsym dlsym "libc.so.7"
+//go:cgo_import_dynamic purego_dlerror dlerror "libc.so.7"
+//go:cgo_import_dynamic purego_dlclose dlclose "libc.so.7"

vendor/github.com/ebitengine/purego/dlfcn_nocgo_linux.go

@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build !cgo
+
+package purego
+
+// if there is no Cgo we must link to each of the functions from dlfcn.h
+// then the functions are called inside dlfcn_stubs.s
+
+//go:cgo_import_dynamic purego_dlopen dlopen "libdl.so.2"
+//go:cgo_import_dynamic purego_dlsym dlsym "libdl.so.2"
+//go:cgo_import_dynamic purego_dlerror dlerror "libdl.so.2"
+//go:cgo_import_dynamic purego_dlclose dlclose "libdl.so.2"
+
+// on amd64 we don't need the following line - on 386 we do...
+// anyway - with those lines the output is better (but doesn't matter) - without it on amd64 we get multiple DT_NEEDED with "libc.so.6" etc
+
+//go:cgo_import_dynamic _ _ "libdl.so.2"

vendor/github.com/ebitengine/purego/dlfcn_stubs.s

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || !cgo && (freebsd ||  linux)
+
+#include "textflag.h"
+
+// func dlopen(path *byte, mode int) (ret uintptr)
+TEXT dlopen(SB), NOSPLIT|NOFRAME, $0-0
+	JMP purego_dlopen(SB)
+	RET
+
+// func dlsym(handle uintptr, symbol *byte) (ret uintptr)
+TEXT dlsym(SB), NOSPLIT|NOFRAME, $0-0
+	JMP purego_dlsym(SB)
+	RET
+
+// func dlerror() (ret *byte)
+TEXT dlerror(SB), NOSPLIT|NOFRAME, $0-0
+	JMP purego_dlerror(SB)
+	RET
+
+// func dlclose(handle uintptr) (ret int)
+TEXT dlclose(SB), NOSPLIT|NOFRAME, $0-0
+	JMP purego_dlclose(SB)
+	RET

vendor/github.com/ebitengine/purego/func.go

@@ -0,0 +1,409 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux || windows
+
+package purego
+
+import (
+	"fmt"
+	"math"
+	"reflect"
+	"runtime"
+	"unsafe"
+
+	"github.com/ebitengine/purego/internal/strings"
+)
+
+// RegisterLibFunc is a wrapper around RegisterFunc that uses the C function returned from Dlsym(handle, name).
+// It panics if it can't find the name symbol.
+func RegisterLibFunc(fptr interface{}, handle uintptr, name string) {
+	sym, err := loadSymbol(handle, name)
+	if err != nil {
+		panic(err)
+	}
+	RegisterFunc(fptr, sym)
+}
+
+// RegisterFunc takes a pointer to a Go function representing the calling convention of the C function.
+// fptr will be set to a function that when called will call the C function given by cfn with the
+// parameters passed in the correct registers and stack.
+//
+// A panic is produced if the type is not a function pointer or if the function returns more than 1 value.
+//
+// These conversions describe how a Go type in the fptr will be used to call
+// the C function. It is important to note that there is no way to verify that fptr
+// matches the C function. This also holds true for struct types where the padding
+// needs to be ensured to match that of C; RegisterFunc does not verify this.
+//
+// # Type Conversions (Go <=> C)
+//
+//	string <=> char*
+//	bool <=> _Bool
+//	uintptr <=> uintptr_t
+//	uint <=> uint32_t or uint64_t
+//	uint8 <=> uint8_t
+//	uint16 <=> uint16_t
+//	uint32 <=> uint32_t
+//	uint64 <=> uint64_t
+//	int <=> int32_t or int64_t
+//	int8 <=> int8_t
+//	int16 <=> int16_t
+//	int32 <=> int32_t
+//	int64 <=> int64_t
+//	float32 <=> float
+//	float64 <=> double
+//	struct <=> struct (WIP - darwin only)
+//	func <=> C function
+//	unsafe.Pointer, *T <=> void*
+//	[]T => void*
+//
+// There is a special case when the last argument of fptr is a variadic interface (or []interface}
+// it will be expanded into a call to the C function as if it had the arguments in that slice.
+// This means that using arg ...interface{} is like a cast to the function with the arguments inside arg.
+// This is not the same as C variadic.
+//
+// # Memory
+//
+// In general it is not possible for purego to guarantee the lifetimes of objects returned or received from
+// calling functions using RegisterFunc. For arguments to a C function it is important that the C function doesn't
+// hold onto a reference to Go memory. This is the same as the [Cgo rules].
+//
+// However, there are some special cases. When passing a string as an argument if the string does not end in a null
+// terminated byte (\x00) then the string will be copied into memory maintained by purego. The memory is only valid for
+// that specific call. Therefore, if the C code keeps a reference to that string it may become invalid at some
+// undefined time. However, if the string does already contain a null-terminated byte then no copy is done.
+// It is then the responsibility of the caller to ensure the string stays alive as long as it's needed in C memory.
+// This can be done using runtime.KeepAlive or allocating the string in C memory using malloc. When a C function
+// returns a null-terminated pointer to char a Go string can be used. Purego will allocate a new string in Go memory
+// and copy the data over. This string will be garbage collected whenever Go decides it's no longer referenced.
+// This C created string will not be freed by purego. If the pointer to char is not null-terminated or must continue
+// to point to C memory (because it's a buffer for example) then use a pointer to byte and then convert that to a slice
+// using unsafe.Slice. Doing this means that it becomes the responsibility of the caller to care about the lifetime
+// of the pointer
+//
+// # Structs
+//
+// Purego can handle the most common structs that have fields of builtin types like int8, uint16, float32, etc. However,
+// it does not support aligning fields properly. It is therefore the responsibility of the caller to ensure
+// that all padding is added to the Go struct to match the C one. See `BoolStructFn` in struct_test.go for an example.
+//
+// # Example
+//
+// All functions below call this C function:
+//
+//	char *foo(char *str);
+//
+//	// Let purego convert types
+//	var foo func(s string) string
+//	goString := foo("copied")
+//	// Go will garbage collect this string
+//
+//	// Manually, handle allocations
+//	var foo2 func(b string) *byte
+//	mustFree := foo2("not copied\x00")
+//	defer free(mustFree)
+//
+// [Cgo rules]: https://pkg.go.dev/cmd/cgo#hdr-Go_references_to_C
+func RegisterFunc(fptr interface{}, cfn uintptr) {
+	fn := reflect.ValueOf(fptr).Elem()
+	ty := fn.Type()
+	if ty.Kind() != reflect.Func {
+		panic("purego: fptr must be a function pointer")
+	}
+	if ty.NumOut() > 1 {
+		panic("purego: function can only return zero or one values")
+	}
+	if cfn == 0 {
+		panic("purego: cfn is nil")
+	}
+	{
+		// this code checks how many registers and stack this function will use
+		// to avoid crashing with too many arguments
+		var ints int
+		var floats int
+		var stack int
+		for i := 0; i < ty.NumIn(); i++ {
+			arg := ty.In(i)
+			switch arg.Kind() {
+			case reflect.String, reflect.Uintptr, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+				reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Ptr, reflect.UnsafePointer, reflect.Slice,
+				reflect.Func, reflect.Bool:
+				if ints < numOfIntegerRegisters() {
+					ints++
+				} else {
+					stack++
+				}
+			case reflect.Float32, reflect.Float64:
+				if is32bit {
+					panic("purego: floats only supported on 64bit platforms")
+				}
+				if floats < numOfFloats {
+					floats++
+				} else {
+					stack++
+				}
+			case reflect.Struct:
+				if runtime.GOOS != "darwin" || (runtime.GOARCH != "amd64" && runtime.GOARCH != "arm64") {
+					panic("purego: struct arguments are only supported on darwin amd64 & arm64")
+				}
+				if arg.Size() == 0 {
+					continue
+				}
+				addInt := func(u uintptr) {
+					ints++
+				}
+				addFloat := func(u uintptr) {
+					floats++
+				}
+				addStack := func(u uintptr) {
+					stack++
+				}
+				_ = addStruct(reflect.New(arg).Elem(), &ints, &floats, &stack, addInt, addFloat, addStack, nil)
+			default:
+				panic("purego: unsupported kind " + arg.Kind().String())
+			}
+		}
+		if ty.NumOut() == 1 && ty.Out(0).Kind() == reflect.Struct {
+			if runtime.GOOS != "darwin" {
+				panic("purego: struct return values only supported on darwin arm64 & amd64")
+			}
+			outType := ty.Out(0)
+			checkStructFieldsSupported(outType)
+			if runtime.GOARCH == "amd64" && outType.Size() > maxRegAllocStructSize {
+				// on amd64 if struct is bigger than 16 bytes allocate the return struct
+				// and pass it in as a hidden first argument.
+				ints++
+			}
+		}
+		sizeOfStack := maxArgs - numOfIntegerRegisters()
+		if stack > sizeOfStack {
+			panic("purego: too many arguments")
+		}
+	}
+	v := reflect.MakeFunc(ty, func(args []reflect.Value) (results []reflect.Value) {
+		if len(args) > 0 {
+			if variadic, ok := args[len(args)-1].Interface().([]interface{}); ok {
+				// subtract one from args bc the last argument in args is []interface{}
+				// which we are currently expanding
+				tmp := make([]reflect.Value, len(args)-1+len(variadic))
+				n := copy(tmp, args[:len(args)-1])
+				for i, v := range variadic {
+					tmp[n+i] = reflect.ValueOf(v)
+				}
+				args = tmp
+			}
+		}
+		var sysargs [maxArgs]uintptr
+		stack := sysargs[numOfIntegerRegisters():]
+		var floats [numOfFloats]uintptr
+		var numInts int
+		var numFloats int
+		var numStack int
+		var addStack, addInt, addFloat func(x uintptr)
+		if runtime.GOARCH == "arm64" || runtime.GOOS != "windows" {
+			// Windows arm64 uses the same calling convention as macOS and Linux
+			addStack = func(x uintptr) {
+				stack[numStack] = x
+				numStack++
+			}
+			addInt = func(x uintptr) {
+				if numInts >= numOfIntegerRegisters() {
+					addStack(x)
+				} else {
+					sysargs[numInts] = x
+					numInts++
+				}
+			}
+			addFloat = func(x uintptr) {
+				if numFloats < len(floats) {
+					floats[numFloats] = x
+					numFloats++
+				} else {
+					addStack(x)
+				}
+			}
+		} else {
+			// On Windows amd64 the arguments are passed in the numbered registered.
+			// So the first int is in the first integer register and the first float
+			// is in the second floating register if there is already a first int.
+			// This is in contrast to how macOS and Linux pass arguments which
+			// tries to use as many registers as possible in the calling convention.
+			addStack = func(x uintptr) {
+				sysargs[numStack] = x
+				numStack++
+			}
+			addInt = addStack
+			addFloat = addStack
+		}
+
+		var keepAlive []interface{}
+		defer func() {
+			runtime.KeepAlive(keepAlive)
+			runtime.KeepAlive(args)
+		}()
+		var syscall syscall15Args
+		if ty.NumOut() == 1 && ty.Out(0).Kind() == reflect.Struct {
+			outType := ty.Out(0)
+			if runtime.GOARCH == "amd64" && outType.Size() > maxRegAllocStructSize {
+				val := reflect.New(outType)
+				keepAlive = append(keepAlive, val)
+				addInt(val.Pointer())
+			} else if runtime.GOARCH == "arm64" && outType.Size() > maxRegAllocStructSize {
+				if !isAllSameFloat(outType) || outType.NumField() > 4 {
+					val := reflect.New(outType)
+					keepAlive = append(keepAlive, val)
+					syscall.arm64_r8 = val.Pointer()
+				}
+			}
+		}
+		for _, v := range args {
+			switch v.Kind() {
+			case reflect.String:
+				ptr := strings.CString(v.String())
+				keepAlive = append(keepAlive, ptr)
+				addInt(uintptr(unsafe.Pointer(ptr)))
+			case reflect.Uintptr, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+				addInt(uintptr(v.Uint()))
+			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+				addInt(uintptr(v.Int()))
+			case reflect.Ptr, reflect.UnsafePointer, reflect.Slice:
+				// There is no need to keepAlive this pointer separately because it is kept alive in the args variable
+				addInt(v.Pointer())
+			case reflect.Func:
+				addInt(NewCallback(v.Interface()))
+			case reflect.Bool:
+				if v.Bool() {
+					addInt(1)
+				} else {
+					addInt(0)
+				}
+			case reflect.Float32:
+				addFloat(uintptr(math.Float32bits(float32(v.Float()))))
+			case reflect.Float64:
+				addFloat(uintptr(math.Float64bits(v.Float())))
+			case reflect.Struct:
+				keepAlive = addStruct(v, &numInts, &numFloats, &numStack, addInt, addFloat, addStack, keepAlive)
+			default:
+				panic("purego: unsupported kind: " + v.Kind().String())
+			}
+		}
+		if runtime.GOARCH == "arm64" || runtime.GOOS != "windows" {
+			// Use the normal arm64 calling convention even on Windows
+			syscall = syscall15Args{
+				cfn,
+				sysargs[0], sysargs[1], sysargs[2], sysargs[3], sysargs[4], sysargs[5],
+				sysargs[6], sysargs[7], sysargs[8], sysargs[9], sysargs[10], sysargs[11],
+				sysargs[12], sysargs[13], sysargs[14],
+				floats[0], floats[1], floats[2], floats[3], floats[4], floats[5], floats[6], floats[7],
+				syscall.arm64_r8,
+			}
+			runtime_cgocall(syscall15XABI0, unsafe.Pointer(&syscall))
+		} else {
+			// This is a fallback for Windows amd64, 386, and arm. Note this may not support floats
+			syscall.a1, syscall.a2, _ = syscall_syscall15X(cfn, sysargs[0], sysargs[1], sysargs[2], sysargs[3], sysargs[4],
+				sysargs[5], sysargs[6], sysargs[7], sysargs[8], sysargs[9], sysargs[10], sysargs[11],
+				sysargs[12], sysargs[13], sysargs[14])
+			syscall.f1 = syscall.a2 // on amd64 a2 stores the float return. On 32bit platforms floats aren't support
+		}
+		if ty.NumOut() == 0 {
+			return nil
+		}
+		outType := ty.Out(0)
+		v := reflect.New(outType).Elem()
+		switch outType.Kind() {
+		case reflect.Uintptr, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+			v.SetUint(uint64(syscall.a1))
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+			v.SetInt(int64(syscall.a1))
+		case reflect.Bool:
+			v.SetBool(byte(syscall.a1) != 0)
+		case reflect.UnsafePointer:
+			// We take the address and then dereference it to trick go vet from creating a possible miss-use of unsafe.Pointer
+			v.SetPointer(*(*unsafe.Pointer)(unsafe.Pointer(&syscall.a1)))
+		case reflect.Ptr:
+			// It is safe to have the address of syscall.r1 not escape because it is immediately dereferenced with .Elem()
+			v = reflect.NewAt(outType, runtime_noescape(unsafe.Pointer(&syscall.a1))).Elem()
+		case reflect.Func:
+			// wrap this C function in a nicely typed Go function
+			v = reflect.New(outType)
+			RegisterFunc(v.Interface(), syscall.a1)
+		case reflect.String:
+			v.SetString(strings.GoString(syscall.a1))
+		case reflect.Float32:
+			// NOTE: syscall.r2 is only the floating return value on 64bit platforms.
+			// On 32bit platforms syscall.r2 is the upper part of a 64bit return.
+			v.SetFloat(float64(math.Float32frombits(uint32(syscall.f1))))
+		case reflect.Float64:
+			// NOTE: syscall.r2 is only the floating return value on 64bit platforms.
+			// On 32bit platforms syscall.r2 is the upper part of a 64bit return.
+			v.SetFloat(math.Float64frombits(uint64(syscall.f1)))
+		case reflect.Struct:
+			v = getStruct(outType, syscall)
+		default:
+			panic("purego: unsupported return kind: " + outType.Kind().String())
+		}
+		return []reflect.Value{v}
+	})
+	fn.Set(v)
+}
+
+// maxRegAllocStructSize is the biggest a struct can be while still fitting in registers.
+// if it is bigger than this than enough space must be allocated on the heap and then passed into
+// the function as the first parameter on amd64 or in R8 on arm64.
+const maxRegAllocStructSize = 16
+
+func isAllSameFloat(ty reflect.Type) bool {
+	first := ty.Field(0).Type.Kind()
+	if first != reflect.Float32 && first != reflect.Float64 {
+		return false
+	}
+	for i := 0; i < ty.NumField(); i++ {
+		f := ty.Field(i)
+		if f.Type.Kind() != first {
+			return false
+		}
+	}
+	return true
+}
+
+func checkStructFieldsSupported(ty reflect.Type) {
+	for i := 0; i < ty.NumField(); i++ {
+		f := ty.Field(i).Type
+		if f.Kind() == reflect.Array {
+			f = f.Elem()
+		} else if f.Kind() == reflect.Struct {
+			checkStructFieldsSupported(f)
+			continue
+		}
+		switch f.Kind() {
+		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
+			reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
+			reflect.Uintptr, reflect.Ptr, reflect.UnsafePointer, reflect.Float64, reflect.Float32:
+		default:
+			panic(fmt.Sprintf("purego: struct field type %s is not supported", f))
+		}
+	}
+}
+
+const is32bit = unsafe.Sizeof(uintptr(0)) == 4
+
+func roundUpTo8(val uintptr) uintptr {
+	return (val + 7) &^ 7
+}
+
+func numOfIntegerRegisters() int {
+	switch runtime.GOARCH {
+	case "arm64":
+		return 8
+	case "amd64":
+		return 6
+	// TODO: figure out why 386 tests are not working
+	/*case "386":
+		return 0
+	case "arm":
+		return 4*/
+	default:
+		panic("purego: unknown GOARCH (" + runtime.GOARCH + ")")
+	}
+}

vendor/github.com/ebitengine/purego/go_runtime.go

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux || windows
+
+package purego
+
+import (
+	"unsafe"
+)
+
+//go:linkname runtime_cgocall runtime.cgocall
+func runtime_cgocall(fn uintptr, arg unsafe.Pointer) int32 // from runtime/sys_libc.go
+
+//go:linkname runtime_noescape runtime.noescape
+//go:noescape
+func runtime_noescape(p unsafe.Pointer) unsafe.Pointer // from runtime/stubs.go

vendor/github.com/ebitengine/purego/internal/cgo/dlfcn_cgo_unix.go

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
+
+//go:build freebsd || linux
+
+package cgo
+
+/*
+ #cgo LDFLAGS: -ldl
+
+#include <dlfcn.h>
+*/
+import "C"
+
+// all that is needed is to assign each dl function because then its
+// symbol will then be made available to the linker and linked to inside dlfcn.go
+var (
+	_ = C.dlopen
+	_ = C.dlsym
+	_ = C.dlerror
+	_ = C.dlclose
+)

vendor/github.com/ebitengine/purego/internal/cgo/empty.go

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2024 The Ebitengine Authors
+
+package cgo
+
+// Empty so that importing this package doesn't cause issue for certain platforms.

vendor/github.com/ebitengine/purego/internal/cgo/syscall_cgo_unix.go

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build freebsd || (linux && !(arm64 || amd64))
+
+package cgo
+
+// this file is placed inside internal/cgo and not package purego
+// because Cgo and assembly files can't be in the same package.
+
+/*
+ #cgo LDFLAGS: -ldl
+
+#include <stdint.h>
+#include <dlfcn.h>
+#include <errno.h>
+#include <assert.h>
+
+typedef struct syscall15Args {
+	uintptr_t fn;
+	uintptr_t a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15;
+	uintptr_t f1, f2, f3, f4, f5, f6, f7, f8;
+	uintptr_t r1, r2, err;
+} syscall15Args;
+
+void syscall15(struct syscall15Args *args) {
+	assert((args->f1|args->f2|args->f3|args->f4|args->f5|args->f6|args->f7|args->f8) == 0);
+	uintptr_t (*func_name)(uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6,
+		uintptr_t a7, uintptr_t a8, uintptr_t a9, uintptr_t a10, uintptr_t a11, uintptr_t a12,
+		uintptr_t a13, uintptr_t a14, uintptr_t a15);
+	*(void**)(&func_name) = (void*)(args->fn);
+	uintptr_t r1 =  func_name(args->a1,args->a2,args->a3,args->a4,args->a5,args->a6,args->a7,args->a8,args->a9,
+		args->a10,args->a11,args->a12,args->a13,args->a14,args->a15);
+	args->r1 = r1;
+	args->err = errno;
+}
+
+*/
+import "C"
+import "unsafe"
+
+// assign purego.syscall15XABI0 to the C version of this function.
+var Syscall15XABI0 = unsafe.Pointer(C.syscall15)
+
+//go:nosplit
+func Syscall15X(fn, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14, a15 uintptr) (r1, r2, err uintptr) {
+	args := C.syscall15Args{
+		C.uintptr_t(fn), C.uintptr_t(a1), C.uintptr_t(a2), C.uintptr_t(a3),
+		C.uintptr_t(a4), C.uintptr_t(a5), C.uintptr_t(a6),
+		C.uintptr_t(a7), C.uintptr_t(a8), C.uintptr_t(a9), C.uintptr_t(a10), C.uintptr_t(a11), C.uintptr_t(a12),
+		C.uintptr_t(a13), C.uintptr_t(a14), C.uintptr_t(a15), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	}
+	C.syscall15(&args)
+	return uintptr(args.r1), uintptr(args.r2), uintptr(args.err)
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/abi_amd64.h

@@ -0,0 +1,99 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Macros for transitioning from the host ABI to Go ABI0.
+//
+// These save the frame pointer, so in general, functions that use
+// these should have zero frame size to suppress the automatic frame
+// pointer, though it's harmless to not do this.
+
+#ifdef GOOS_windows
+
+// REGS_HOST_TO_ABI0_STACK is the stack bytes used by
+// PUSH_REGS_HOST_TO_ABI0.
+#define REGS_HOST_TO_ABI0_STACK (28*8 + 8)
+
+// PUSH_REGS_HOST_TO_ABI0 prepares for transitioning from
+// the host ABI to Go ABI0 code. It saves all registers that are
+// callee-save in the host ABI and caller-save in Go ABI0 and prepares
+// for entry to Go.
+//
+// Save DI SI BP BX R12 R13 R14 R15 X6-X15 registers and the DF flag.
+// Clear the DF flag for the Go ABI.
+// MXCSR matches the Go ABI, so we don't have to set that,
+// and Go doesn't modify it, so we don't have to save it.
+#define PUSH_REGS_HOST_TO_ABI0()	\
+	PUSHFQ			\
+	CLD			\
+	ADJSP	$(REGS_HOST_TO_ABI0_STACK - 8)	\
+	MOVQ	DI, (0*0)(SP)	\
+	MOVQ	SI, (1*8)(SP)	\
+	MOVQ	BP, (2*8)(SP)	\
+	MOVQ	BX, (3*8)(SP)	\
+	MOVQ	R12, (4*8)(SP)	\
+	MOVQ	R13, (5*8)(SP)	\
+	MOVQ	R14, (6*8)(SP)	\
+	MOVQ	R15, (7*8)(SP)	\
+	MOVUPS	X6, (8*8)(SP)	\
+	MOVUPS	X7, (10*8)(SP)	\
+	MOVUPS	X8, (12*8)(SP)	\
+	MOVUPS	X9, (14*8)(SP)	\
+	MOVUPS	X10, (16*8)(SP)	\
+	MOVUPS	X11, (18*8)(SP)	\
+	MOVUPS	X12, (20*8)(SP)	\
+	MOVUPS	X13, (22*8)(SP)	\
+	MOVUPS	X14, (24*8)(SP)	\
+	MOVUPS	X15, (26*8)(SP)
+
+#define POP_REGS_HOST_TO_ABI0()	\
+	MOVQ	(0*0)(SP), DI	\
+	MOVQ	(1*8)(SP), SI	\
+	MOVQ	(2*8)(SP), BP	\
+	MOVQ	(3*8)(SP), BX	\
+	MOVQ	(4*8)(SP), R12	\
+	MOVQ	(5*8)(SP), R13	\
+	MOVQ	(6*8)(SP), R14	\
+	MOVQ	(7*8)(SP), R15	\
+	MOVUPS	(8*8)(SP), X6	\
+	MOVUPS	(10*8)(SP), X7	\
+	MOVUPS	(12*8)(SP), X8	\
+	MOVUPS	(14*8)(SP), X9	\
+	MOVUPS	(16*8)(SP), X10	\
+	MOVUPS	(18*8)(SP), X11	\
+	MOVUPS	(20*8)(SP), X12	\
+	MOVUPS	(22*8)(SP), X13	\
+	MOVUPS	(24*8)(SP), X14	\
+	MOVUPS	(26*8)(SP), X15	\
+	ADJSP	$-(REGS_HOST_TO_ABI0_STACK - 8)	\
+	POPFQ
+
+#else
+// SysV ABI
+
+#define REGS_HOST_TO_ABI0_STACK (6*8)
+
+// SysV MXCSR matches the Go ABI, so we don't have to set that,
+// and Go doesn't modify it, so we don't have to save it.
+// Both SysV and Go require DF to be cleared, so that's already clear.
+// The SysV and Go frame pointer conventions are compatible.
+#define PUSH_REGS_HOST_TO_ABI0()	\
+	ADJSP	$(REGS_HOST_TO_ABI0_STACK)	\
+	MOVQ	BP, (5*8)(SP)	\
+	LEAQ	(5*8)(SP), BP	\
+	MOVQ	BX, (0*8)(SP)	\
+	MOVQ	R12, (1*8)(SP)	\
+	MOVQ	R13, (2*8)(SP)	\
+	MOVQ	R14, (3*8)(SP)	\
+	MOVQ	R15, (4*8)(SP)
+
+#define POP_REGS_HOST_TO_ABI0()	\
+	MOVQ	(0*8)(SP), BX	\
+	MOVQ	(1*8)(SP), R12	\
+	MOVQ	(2*8)(SP), R13	\
+	MOVQ	(3*8)(SP), R14	\
+	MOVQ	(4*8)(SP), R15	\
+	MOVQ	(5*8)(SP), BP	\
+	ADJSP	$-(REGS_HOST_TO_ABI0_STACK)
+
+#endif

vendor/github.com/ebitengine/purego/internal/fakecgo/abi_arm64.h

@@ -0,0 +1,39 @@
+// Copyright 2021 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Macros for transitioning from the host ABI to Go ABI0.
+//
+// These macros save and restore the callee-saved registers
+// from the stack, but they don't adjust stack pointer, so
+// the user should prepare stack space in advance.
+// SAVE_R19_TO_R28(offset) saves R19 ~ R28 to the stack space
+// of ((offset)+0*8)(RSP) ~ ((offset)+9*8)(RSP).
+//
+// SAVE_F8_TO_F15(offset) saves F8 ~ F15 to the stack space
+// of ((offset)+0*8)(RSP) ~ ((offset)+7*8)(RSP).
+//
+// R29 is not saved because Go will save and restore it.
+
+#define SAVE_R19_TO_R28(offset) \
+	STP	(R19, R20), ((offset)+0*8)(RSP) \
+	STP	(R21, R22), ((offset)+2*8)(RSP) \
+	STP	(R23, R24), ((offset)+4*8)(RSP) \
+	STP	(R25, R26), ((offset)+6*8)(RSP) \
+	STP	(R27, g), ((offset)+8*8)(RSP)
+#define RESTORE_R19_TO_R28(offset) \
+	LDP	((offset)+0*8)(RSP), (R19, R20) \
+	LDP	((offset)+2*8)(RSP), (R21, R22) \
+	LDP	((offset)+4*8)(RSP), (R23, R24) \
+	LDP	((offset)+6*8)(RSP), (R25, R26) \
+	LDP	((offset)+8*8)(RSP), (R27, g) /* R28 */
+#define SAVE_F8_TO_F15(offset) \
+	FSTPD	(F8, F9), ((offset)+0*8)(RSP) \
+	FSTPD	(F10, F11), ((offset)+2*8)(RSP) \
+	FSTPD	(F12, F13), ((offset)+4*8)(RSP) \
+	FSTPD	(F14, F15), ((offset)+6*8)(RSP)
+#define RESTORE_F8_TO_F15(offset) \
+	FLDPD	((offset)+0*8)(RSP), (F8, F9) \
+	FLDPD	((offset)+2*8)(RSP), (F10, F11) \
+	FLDPD	((offset)+4*8)(RSP), (F12, F13) \
+	FLDPD	((offset)+6*8)(RSP), (F14, F15)

vendor/github.com/ebitengine/purego/internal/fakecgo/asm_amd64.s

@@ -0,0 +1,39 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "abi_amd64.h"
+
+// Called by C code generated by cmd/cgo.
+// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
+// Saves C callee-saved registers and calls cgocallback with three arguments.
+// fn is the PC of a func(a unsafe.Pointer) function.
+// This signature is known to SWIG, so we can't change it.
+TEXT crosscall2(SB), NOSPLIT, $0-0
+	PUSH_REGS_HOST_TO_ABI0()
+
+	// Make room for arguments to cgocallback.
+	ADJSP $0x18
+
+#ifndef GOOS_windows
+	MOVQ DI, 0x0(SP) // fn
+	MOVQ SI, 0x8(SP) // arg
+
+	// Skip n in DX.
+	MOVQ CX, 0x10(SP) // ctxt
+
+#else
+	MOVQ CX, 0x0(SP) // fn
+	MOVQ DX, 0x8(SP) // arg
+
+	// Skip n in R8.
+	MOVQ R9, 0x10(SP) // ctxt
+
+#endif
+
+	CALL runtime·cgocallback(SB)
+
+	ADJSP $-0x18
+	POP_REGS_HOST_TO_ABI0()
+	RET

vendor/github.com/ebitengine/purego/internal/fakecgo/asm_arm64.s

@@ -0,0 +1,36 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+#include "abi_arm64.h"
+
+// Called by C code generated by cmd/cgo.
+// func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
+// Saves C callee-saved registers and calls cgocallback with three arguments.
+// fn is the PC of a func(a unsafe.Pointer) function.
+TEXT crosscall2(SB), NOSPLIT|NOFRAME, $0
+/*
+ * We still need to save all callee save register as before, and then
+ *  push 3 args for fn (R0, R1, R3), skipping R2.
+ * Also note that at procedure entry in gc world, 8(RSP) will be the
+ *  first arg.
+ */
+	SUB  $(8*24), RSP
+	STP  (R0, R1), (8*1)(RSP)
+	MOVD R3, (8*3)(RSP)
+
+	SAVE_R19_TO_R28(8*4)
+	SAVE_F8_TO_F15(8*14)
+	STP (R29, R30), (8*22)(RSP)
+
+	// Initialize Go ABI environment
+	BL runtime·load_g(SB)
+	BL runtime·cgocallback(SB)
+
+	RESTORE_R19_TO_R28(8*4)
+	RESTORE_F8_TO_F15(8*14)
+	LDP (8*22)(RSP), (R29, R30)
+
+	ADD $(8*24), RSP
+	RET

vendor/github.com/ebitengine/purego/internal/fakecgo/callbacks.go

@@ -0,0 +1,93 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import (
+	_ "unsafe"
+)
+
+// TODO: decide if we need _runtime_cgo_panic_internal
+
+//go:linkname x_cgo_init_trampoline x_cgo_init_trampoline
+//go:linkname _cgo_init _cgo_init
+var x_cgo_init_trampoline byte
+var _cgo_init = &x_cgo_init_trampoline
+
+// Creates a new system thread without updating any Go state.
+//
+// This method is invoked during shared library loading to create a new OS
+// thread to perform the runtime initialization. This method is similar to
+// _cgo_sys_thread_start except that it doesn't update any Go state.
+
+//go:linkname x_cgo_thread_start_trampoline x_cgo_thread_start_trampoline
+//go:linkname _cgo_thread_start _cgo_thread_start
+var x_cgo_thread_start_trampoline byte
+var _cgo_thread_start = &x_cgo_thread_start_trampoline
+
+// Notifies that the runtime has been initialized.
+//
+// We currently block at every CGO entry point (via _cgo_wait_runtime_init_done)
+// to ensure that the runtime has been initialized before the CGO call is
+// executed. This is necessary for shared libraries where we kickoff runtime
+// initialization in a separate thread and return without waiting for this
+// thread to complete the init.
+
+//go:linkname x_cgo_notify_runtime_init_done_trampoline x_cgo_notify_runtime_init_done_trampoline
+//go:linkname _cgo_notify_runtime_init_done _cgo_notify_runtime_init_done
+var x_cgo_notify_runtime_init_done_trampoline byte
+var _cgo_notify_runtime_init_done = &x_cgo_notify_runtime_init_done_trampoline
+
+// Indicates whether a dummy thread key has been created or not.
+//
+// When calling go exported function from C, we register a destructor
+// callback, for a dummy thread key, by using pthread_key_create.
+
+//go:linkname _cgo_pthread_key_created _cgo_pthread_key_created
+var x_cgo_pthread_key_created uintptr
+var _cgo_pthread_key_created = &x_cgo_pthread_key_created
+
+// Set the x_crosscall2_ptr C function pointer variable point to crosscall2.
+// It's for the runtime package to call at init time.
+func set_crosscall2() {
+	// nothing needs to be done here for fakecgo
+	// because it's possible to just call cgocallback directly
+}
+
+//go:linkname _set_crosscall2 runtime.set_crosscall2
+var _set_crosscall2 = set_crosscall2
+
+// Store the g into the thread-specific value.
+// So that pthread_key_destructor will dropm when the thread is exiting.
+
+//go:linkname x_cgo_bindm_trampoline x_cgo_bindm_trampoline
+//go:linkname _cgo_bindm _cgo_bindm
+var x_cgo_bindm_trampoline byte
+var _cgo_bindm = &x_cgo_bindm_trampoline
+
+// TODO: decide if we need x_cgo_set_context_function
+// TODO: decide if we need _cgo_yield
+
+var (
+	// In Go 1.20 the race detector was rewritten to pure Go
+	// on darwin. This means that when CGO_ENABLED=0 is set
+	// fakecgo is built with race detector code. This is not
+	// good since this code is pretending to be C. The go:norace
+	// pragma is not enough, since it only applies to the native
+	// ABIInternal function. The ABIO wrapper (which is necessary,
+	// since all references to text symbols from assembly will use it)
+	// does not inherit the go:norace pragma, so it will still be
+	// instrumented by the race detector.
+	//
+	// To circumvent this issue, using closure calls in the
+	// assembly, which forces the compiler to use the ABIInternal
+	// native implementation (which has go:norace) instead.
+	threadentry_call        = threadentry
+	x_cgo_init_call         = x_cgo_init
+	x_cgo_setenv_call       = x_cgo_setenv
+	x_cgo_unsetenv_call     = x_cgo_unsetenv
+	x_cgo_thread_start_call = x_cgo_thread_start
+)

vendor/github.com/ebitengine/purego/internal/fakecgo/doc.go

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd
+
+// Package fakecgo implements the Cgo runtime (runtime/cgo) entirely in Go.
+// This allows code that calls into C to function properly when CGO_ENABLED=0.
+//
+// # Goals
+//
+// fakecgo attempts to replicate the same naming structure as in the runtime.
+// For example, functions that have the prefix "gcc_*" are named "go_*".
+// This makes it easier to port other GOOSs and GOARCHs as well as to keep
+// it in sync with runtime/cgo.
+//
+// # Support
+//
+// Currently, fakecgo only supports macOS on amd64 & arm64. It also cannot
+// be used with -buildmode=c-archive because that requires special initialization
+// that fakecgo does not implement at the moment.
+//
+// # Usage
+//
+// Using fakecgo is easy just import _ "github.com/ebitengine/purego" and then
+// set the environment variable CGO_ENABLED=0.
+// The recommended usage for fakecgo is to prefer using runtime/cgo if possible
+// but if cross-compiling or fast build times are important fakecgo is available.
+// Purego will pick which ever Cgo runtime is available and prefer the one that
+// comes with Go (runtime/cgo).
+package fakecgo
+
+//go:generate go run gen.go
+//go:generate gofmt -s -w symbols.go

vendor/github.com/ebitengine/purego/internal/fakecgo/freebsd.go

@@ -0,0 +1,27 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build freebsd && !cgo
+
+package fakecgo
+
+import _ "unsafe" // for go:linkname
+
+// Supply environ and __progname, because we don't
+// link against the standard FreeBSD crt0.o and the
+// libc dynamic library needs them.
+
+// Note: when building with cross-compiling or CGO_ENABLED=0, add
+// the following argument to `go` so that these symbols are defined by
+// making fakecgo the Cgo.
+//   -gcflags="github.com/ebitengine/purego/internal/fakecgo=-std"
+
+//go:linkname _environ environ
+//go:linkname _progname __progname
+
+//go:cgo_export_dynamic environ
+//go:cgo_export_dynamic __progname
+
+var _environ uintptr
+var _progname uintptr

vendor/github.com/ebitengine/purego/internal/fakecgo/go_darwin_amd64.go

@@ -0,0 +1,71 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+//go:norace
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	size = pthread_get_stacksize_np(pthread_self())
+	pthread_attr_init(&attr)
+	pthread_attr_setstacksize(&attr, size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+//go:norace
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+//go:nosplit
+//go:norace
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+
+	setg_func = setg
+
+	size = pthread_get_stacksize_np(pthread_self())
+	g.stacklo = uintptr(unsafe.Add(unsafe.Pointer(&size), -size+4096))
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_darwin_arm64.go

@@ -0,0 +1,86 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+//go:norace
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	size = pthread_get_stacksize_np(pthread_self())
+	pthread_attr_init(&attr)
+	pthread_attr_setstacksize(&attr, size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+//go:norace
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	// TODO: support ios
+	//#if TARGET_OS_IPHONE
+	//	darwin_arm_init_thread_exception_port();
+	//#endif
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+// x_cgo_init(G *g, void (*setg)(void*)) (runtime/cgo/gcc_linux_amd64.c)
+// This get's called during startup, adjusts stacklo, and provides a pointer to setg_gcc for us
+// Additionally, if we set _cgo_init to non-null, go won't do it's own TLS setup
+// This function can't be go:systemstack since go is not in a state where the systemcheck would work.
+//
+//go:nosplit
+//go:norace
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+
+	setg_func = setg
+	size = pthread_get_stacksize_np(pthread_self())
+	g.stacklo = uintptr(unsafe.Add(unsafe.Pointer(&size), -size+4096))
+
+	//TODO: support ios
+	//#if TARGET_OS_IPHONE
+	//	darwin_arm_init_mach_exception_handler();
+	//	darwin_arm_init_thread_exception_port();
+	//	init_working_dir();
+	//#endif
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_freebsd_amd64.go

@@ -0,0 +1,93 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	//fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	pthread_attr_init(&attr)
+	pthread_attr_getstacksize(&attr, &size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+//go:nosplit
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+	var attr *pthread_attr_t
+
+	/* The memory sanitizer distributed with versions of clang
+	   before 3.8 has a bug: if you call mmap before malloc, mmap
+	   may return an address that is later overwritten by the msan
+	   library.  Avoid this problem by forcing a call to malloc
+	   here, before we ever call malloc.
+
+	   This is only required for the memory sanitizer, so it's
+	   unfortunate that we always run it.  It should be possible
+	   to remove this when we no longer care about versions of
+	   clang before 3.8.  The test for this is
+	   misc/cgo/testsanitizers.
+
+	   GCC works hard to eliminate a seemingly unnecessary call to
+	   malloc, so we actually use the memory we allocate.  */
+
+	setg_func = setg
+	attr = (*pthread_attr_t)(malloc(unsafe.Sizeof(*attr)))
+	if attr == nil {
+		println("fakecgo: malloc failed")
+		abort()
+	}
+	pthread_attr_init(attr)
+	pthread_attr_getstacksize(attr, &size)
+	// runtime/cgo uses __builtin_frame_address(0) instead of `uintptr(unsafe.Pointer(&size))`
+	// but this should be OK since we are taking the address of the first variable in this function.
+	g.stacklo = uintptr(unsafe.Pointer(&size)) - uintptr(size) + 4096
+	pthread_attr_destroy(attr)
+	free(unsafe.Pointer(attr))
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_freebsd_arm64.go

@@ -0,0 +1,96 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	//fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	pthread_attr_init(&attr)
+	pthread_attr_getstacksize(&attr, &size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+// x_cgo_init(G *g, void (*setg)(void*)) (runtime/cgo/gcc_linux_amd64.c)
+// This get's called during startup, adjusts stacklo, and provides a pointer to setg_gcc for us
+// Additionally, if we set _cgo_init to non-null, go won't do it's own TLS setup
+// This function can't be go:systemstack since go is not in a state where the systemcheck would work.
+//
+//go:nosplit
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+	var attr *pthread_attr_t
+
+	/* The memory sanitizer distributed with versions of clang
+	   before 3.8 has a bug: if you call mmap before malloc, mmap
+	   may return an address that is later overwritten by the msan
+	   library.  Avoid this problem by forcing a call to malloc
+	   here, before we ever call malloc.
+
+	   This is only required for the memory sanitizer, so it's
+	   unfortunate that we always run it.  It should be possible
+	   to remove this when we no longer care about versions of
+	   clang before 3.8.  The test for this is
+	   misc/cgo/testsanitizers.
+
+	   GCC works hard to eliminate a seemingly unnecessary call to
+	   malloc, so we actually use the memory we allocate.  */
+
+	setg_func = setg
+	attr = (*pthread_attr_t)(malloc(unsafe.Sizeof(*attr)))
+	if attr == nil {
+		println("fakecgo: malloc failed")
+		abort()
+	}
+	pthread_attr_init(attr)
+	pthread_attr_getstacksize(attr, &size)
+	g.stacklo = uintptr(unsafe.Pointer(&size)) - uintptr(size) + 4096
+	pthread_attr_destroy(attr)
+	free(unsafe.Pointer(attr))
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_libinit.go

@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var (
+	pthread_g pthread_key_t
+
+	runtime_init_cond = PTHREAD_COND_INITIALIZER
+	runtime_init_mu   = PTHREAD_MUTEX_INITIALIZER
+	runtime_init_done int
+)
+
+//go:nosplit
+func x_cgo_notify_runtime_init_done() {
+	pthread_mutex_lock(&runtime_init_mu)
+	runtime_init_done = 1
+	pthread_cond_broadcast(&runtime_init_cond)
+	pthread_mutex_unlock(&runtime_init_mu)
+}
+
+// Store the g into a thread-specific value associated with the pthread key pthread_g.
+// And pthread_key_destructor will dropm when the thread is exiting.
+func x_cgo_bindm(g unsafe.Pointer) {
+	// We assume this will always succeed, otherwise, there might be extra M leaking,
+	// when a C thread exits after a cgo call.
+	// We only invoke this function once per thread in runtime.needAndBindM,
+	// and the next calls just reuse the bound m.
+	pthread_setspecific(pthread_g, g)
+}
+
+// _cgo_try_pthread_create retries pthread_create if it fails with
+// EAGAIN.
+//
+//go:nosplit
+//go:norace
+func _cgo_try_pthread_create(thread *pthread_t, attr *pthread_attr_t, pfn unsafe.Pointer, arg *ThreadStart) int {
+	var ts syscall.Timespec
+	// tries needs to be the same type as syscall.Timespec.Nsec
+	// but the fields are int32 on 32bit and int64 on 64bit.
+	// tries is assigned to syscall.Timespec.Nsec in order to match its type.
+	tries := ts.Nsec
+	var err int
+
+	for tries = 0; tries < 20; tries++ {
+		err = int(pthread_create(thread, attr, pfn, unsafe.Pointer(arg)))
+		if err == 0 {
+			pthread_detach(*thread)
+			return 0
+		}
+		if err != int(syscall.EAGAIN) {
+			return err
+		}
+		ts.Sec = 0
+		ts.Nsec = (tries + 1) * 1000 * 1000 // Milliseconds.
+		nanosleep(&ts, nil)
+	}
+	return int(syscall.EAGAIN)
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_linux_amd64.go

@@ -0,0 +1,93 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	//fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	pthread_attr_init(&attr)
+	pthread_attr_getstacksize(&attr, &size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+//go:nosplit
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+	var attr *pthread_attr_t
+
+	/* The memory sanitizer distributed with versions of clang
+	   before 3.8 has a bug: if you call mmap before malloc, mmap
+	   may return an address that is later overwritten by the msan
+	   library.  Avoid this problem by forcing a call to malloc
+	   here, before we ever call malloc.
+
+	   This is only required for the memory sanitizer, so it's
+	   unfortunate that we always run it.  It should be possible
+	   to remove this when we no longer care about versions of
+	   clang before 3.8.  The test for this is
+	   misc/cgo/testsanitizers.
+
+	   GCC works hard to eliminate a seemingly unnecessary call to
+	   malloc, so we actually use the memory we allocate.  */
+
+	setg_func = setg
+	attr = (*pthread_attr_t)(malloc(unsafe.Sizeof(*attr)))
+	if attr == nil {
+		println("fakecgo: malloc failed")
+		abort()
+	}
+	pthread_attr_init(attr)
+	pthread_attr_getstacksize(attr, &size)
+	// runtime/cgo uses __builtin_frame_address(0) instead of `uintptr(unsafe.Pointer(&size))`
+	// but this should be OK since we are taking the address of the first variable in this function.
+	g.stacklo = uintptr(unsafe.Pointer(&size)) - uintptr(size) + 4096
+	pthread_attr_destroy(attr)
+	free(unsafe.Pointer(attr))
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_linux_arm64.go

@@ -0,0 +1,96 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package fakecgo
+
+import "unsafe"
+
+//go:nosplit
+func _cgo_sys_thread_start(ts *ThreadStart) {
+	var attr pthread_attr_t
+	var ign, oset sigset_t
+	var p pthread_t
+	var size size_t
+	var err int
+
+	//fprintf(stderr, "runtime/cgo: _cgo_sys_thread_start: fn=%p, g=%p\n", ts->fn, ts->g); // debug
+	sigfillset(&ign)
+	pthread_sigmask(SIG_SETMASK, &ign, &oset)
+
+	pthread_attr_init(&attr)
+	pthread_attr_getstacksize(&attr, &size)
+	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
+	ts.g.stackhi = uintptr(size)
+
+	err = _cgo_try_pthread_create(&p, &attr, unsafe.Pointer(threadentry_trampolineABI0), ts)
+
+	pthread_sigmask(SIG_SETMASK, &oset, nil)
+
+	if err != 0 {
+		print("fakecgo: pthread_create failed: ")
+		println(err)
+		abort()
+	}
+}
+
+// threadentry_trampolineABI0 maps the C ABI to Go ABI then calls the Go function
+//
+//go:linkname x_threadentry_trampoline threadentry_trampoline
+var x_threadentry_trampoline byte
+var threadentry_trampolineABI0 = &x_threadentry_trampoline
+
+//go:nosplit
+func threadentry(v unsafe.Pointer) unsafe.Pointer {
+	ts := *(*ThreadStart)(v)
+	free(v)
+
+	setg_trampoline(setg_func, uintptr(unsafe.Pointer(ts.g)))
+
+	// faking funcs in go is a bit a... involved - but the following works :)
+	fn := uintptr(unsafe.Pointer(&ts.fn))
+	(*(*func())(unsafe.Pointer(&fn)))()
+
+	return nil
+}
+
+// here we will store a pointer to the provided setg func
+var setg_func uintptr
+
+// x_cgo_init(G *g, void (*setg)(void*)) (runtime/cgo/gcc_linux_amd64.c)
+// This get's called during startup, adjusts stacklo, and provides a pointer to setg_gcc for us
+// Additionally, if we set _cgo_init to non-null, go won't do it's own TLS setup
+// This function can't be go:systemstack since go is not in a state where the systemcheck would work.
+//
+//go:nosplit
+func x_cgo_init(g *G, setg uintptr) {
+	var size size_t
+	var attr *pthread_attr_t
+
+	/* The memory sanitizer distributed with versions of clang
+	   before 3.8 has a bug: if you call mmap before malloc, mmap
+	   may return an address that is later overwritten by the msan
+	   library.  Avoid this problem by forcing a call to malloc
+	   here, before we ever call malloc.
+
+	   This is only required for the memory sanitizer, so it's
+	   unfortunate that we always run it.  It should be possible
+	   to remove this when we no longer care about versions of
+	   clang before 3.8.  The test for this is
+	   misc/cgo/testsanitizers.
+
+	   GCC works hard to eliminate a seemingly unnecessary call to
+	   malloc, so we actually use the memory we allocate.  */
+
+	setg_func = setg
+	attr = (*pthread_attr_t)(malloc(unsafe.Sizeof(*attr)))
+	if attr == nil {
+		println("fakecgo: malloc failed")
+		abort()
+	}
+	pthread_attr_init(attr)
+	pthread_attr_getstacksize(attr, &size)
+	g.stacklo = uintptr(unsafe.Pointer(&size)) - uintptr(size) + 4096
+	pthread_attr_destroy(attr)
+	free(unsafe.Pointer(attr))
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_setenv.go

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+//go:nosplit
+//go:norace
+func x_cgo_setenv(arg *[2]*byte) {
+	setenv(arg[0], arg[1], 1)
+}
+
+//go:nosplit
+//go:norace
+func x_cgo_unsetenv(arg *[1]*byte) {
+	unsetenv(arg[0])
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/go_util.go

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import "unsafe"
+
+// _cgo_thread_start is split into three parts in cgo since only one part is system dependent (keep it here for easier handling)
+
+// _cgo_thread_start(ThreadStart *arg) (runtime/cgo/gcc_util.c)
+// This get's called instead of the go code for creating new threads
+// -> pthread_* stuff is used, so threads are setup correctly for C
+// If this is missing, TLS is only setup correctly on thread 1!
+// This function should be go:systemstack instead of go:nosplit (but that requires runtime)
+//
+//go:nosplit
+//go:norace
+func x_cgo_thread_start(arg *ThreadStart) {
+	var ts *ThreadStart
+	// Make our own copy that can persist after we return.
+	//	_cgo_tsan_acquire();
+	ts = (*ThreadStart)(malloc(unsafe.Sizeof(*ts)))
+	//	_cgo_tsan_release();
+	if ts == nil {
+		println("fakecgo: out of memory in thread_start")
+		abort()
+	}
+	// *ts = *arg would cause a writebarrier so use memmove instead
+	memmove(unsafe.Pointer(ts), unsafe.Pointer(arg), unsafe.Sizeof(*ts))
+	_cgo_sys_thread_start(ts) // OS-dependent half
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/iscgo.go

@@ -0,0 +1,19 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || freebsd || linux
+
+// The runtime package contains an uninitialized definition
+// for runtime·iscgo. Override it to tell the runtime we're here.
+// There are various function pointers that should be set too,
+// but those depend on dynamic linker magic to get initialized
+// correctly, and sometimes they break. This variable is a
+// backup: it depends only on old C style static linking rules.
+
+package fakecgo
+
+import _ "unsafe" // for go:linkname
+
+//go:linkname _iscgo runtime.iscgo
+var _iscgo bool = true

vendor/github.com/ebitengine/purego/internal/fakecgo/libcgo.go

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+type (
+	size_t         uintptr
+	sigset_t       [128]byte
+	pthread_attr_t [64]byte
+	pthread_t      int
+	pthread_key_t  uint64
+)
+
+// for pthread_sigmask:
+
+type sighow int32
+
+const (
+	SIG_BLOCK   sighow = 0
+	SIG_UNBLOCK sighow = 1
+	SIG_SETMASK sighow = 2
+)
+
+type G struct {
+	stacklo uintptr
+	stackhi uintptr
+}
+
+type ThreadStart struct {
+	g   *G
+	tls *uintptr
+	fn  uintptr
+}

vendor/github.com/ebitengine/purego/internal/fakecgo/libcgo_darwin.go

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+type (
+	pthread_mutex_t struct {
+		sig    int64
+		opaque [56]byte
+	}
+	pthread_cond_t struct {
+		sig    int64
+		opaque [40]byte
+	}
+)
+
+var (
+	PTHREAD_COND_INITIALIZER  = pthread_cond_t{sig: 0x3CB0B1BB}
+	PTHREAD_MUTEX_INITIALIZER = pthread_mutex_t{sig: 0x32AAABA7}
+)

vendor/github.com/ebitengine/purego/internal/fakecgo/libcgo_freebsd.go

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+type (
+	pthread_cond_t  uintptr
+	pthread_mutex_t uintptr
+)
+
+var (
+	PTHREAD_COND_INITIALIZER  = pthread_cond_t(0)
+	PTHREAD_MUTEX_INITIALIZER = pthread_mutex_t(0)
+)

vendor/github.com/ebitengine/purego/internal/fakecgo/libcgo_linux.go

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+type (
+	pthread_cond_t  [48]byte
+	pthread_mutex_t [48]byte
+)
+
+var (
+	PTHREAD_COND_INITIALIZER  = pthread_cond_t{}
+	PTHREAD_MUTEX_INITIALIZER = pthread_mutex_t{}
+)

vendor/github.com/ebitengine/purego/internal/fakecgo/setenv.go

@@ -0,0 +1,19 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import _ "unsafe" // for go:linkname
+
+//go:linkname x_cgo_setenv_trampoline x_cgo_setenv_trampoline
+//go:linkname _cgo_setenv runtime._cgo_setenv
+var x_cgo_setenv_trampoline byte
+var _cgo_setenv = &x_cgo_setenv_trampoline
+
+//go:linkname x_cgo_unsetenv_trampoline x_cgo_unsetenv_trampoline
+//go:linkname _cgo_unsetenv runtime._cgo_unsetenv
+var x_cgo_unsetenv_trampoline byte
+var _cgo_unsetenv = &x_cgo_unsetenv_trampoline

vendor/github.com/ebitengine/purego/internal/fakecgo/symbols.go

@@ -0,0 +1,184 @@
+// Code generated by 'go generate' with gen.go. DO NOT EDIT.
+
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || freebsd || linux
+
+package fakecgo
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+// setg_trampoline calls setg with the G provided
+func setg_trampoline(setg uintptr, G uintptr)
+
+//go:linkname memmove runtime.memmove
+func memmove(to, from unsafe.Pointer, n uintptr)
+
+// call5 takes fn the C function and 5 arguments and calls the function with those arguments
+func call5(fn, a1, a2, a3, a4, a5 uintptr) uintptr
+
+func malloc(size uintptr) unsafe.Pointer {
+	ret := call5(mallocABI0, uintptr(size), 0, 0, 0, 0)
+	// this indirection is to avoid go vet complaining about possible misuse of unsafe.Pointer
+	return *(*unsafe.Pointer)(unsafe.Pointer(&ret))
+}
+
+func free(ptr unsafe.Pointer) {
+	call5(freeABI0, uintptr(ptr), 0, 0, 0, 0)
+}
+
+func setenv(name *byte, value *byte, overwrite int32) int32 {
+	return int32(call5(setenvABI0, uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(value)), uintptr(overwrite), 0, 0))
+}
+
+func unsetenv(name *byte) int32 {
+	return int32(call5(unsetenvABI0, uintptr(unsafe.Pointer(name)), 0, 0, 0, 0))
+}
+
+func sigfillset(set *sigset_t) int32 {
+	return int32(call5(sigfillsetABI0, uintptr(unsafe.Pointer(set)), 0, 0, 0, 0))
+}
+
+func nanosleep(ts *syscall.Timespec, rem *syscall.Timespec) int32 {
+	return int32(call5(nanosleepABI0, uintptr(unsafe.Pointer(ts)), uintptr(unsafe.Pointer(rem)), 0, 0, 0))
+}
+
+func abort() {
+	call5(abortABI0, 0, 0, 0, 0, 0)
+}
+
+func pthread_attr_init(attr *pthread_attr_t) int32 {
+	return int32(call5(pthread_attr_initABI0, uintptr(unsafe.Pointer(attr)), 0, 0, 0, 0))
+}
+
+func pthread_create(thread *pthread_t, attr *pthread_attr_t, start unsafe.Pointer, arg unsafe.Pointer) int32 {
+	return int32(call5(pthread_createABI0, uintptr(unsafe.Pointer(thread)), uintptr(unsafe.Pointer(attr)), uintptr(start), uintptr(arg), 0))
+}
+
+func pthread_detach(thread pthread_t) int32 {
+	return int32(call5(pthread_detachABI0, uintptr(thread), 0, 0, 0, 0))
+}
+
+func pthread_sigmask(how sighow, ign *sigset_t, oset *sigset_t) int32 {
+	return int32(call5(pthread_sigmaskABI0, uintptr(how), uintptr(unsafe.Pointer(ign)), uintptr(unsafe.Pointer(oset)), 0, 0))
+}
+
+func pthread_self() pthread_t {
+	return pthread_t(call5(pthread_selfABI0, 0, 0, 0, 0, 0))
+}
+
+func pthread_get_stacksize_np(thread pthread_t) size_t {
+	return size_t(call5(pthread_get_stacksize_npABI0, uintptr(thread), 0, 0, 0, 0))
+}
+
+func pthread_attr_getstacksize(attr *pthread_attr_t, stacksize *size_t) int32 {
+	return int32(call5(pthread_attr_getstacksizeABI0, uintptr(unsafe.Pointer(attr)), uintptr(unsafe.Pointer(stacksize)), 0, 0, 0))
+}
+
+func pthread_attr_setstacksize(attr *pthread_attr_t, size size_t) int32 {
+	return int32(call5(pthread_attr_setstacksizeABI0, uintptr(unsafe.Pointer(attr)), uintptr(size), 0, 0, 0))
+}
+
+func pthread_attr_destroy(attr *pthread_attr_t) int32 {
+	return int32(call5(pthread_attr_destroyABI0, uintptr(unsafe.Pointer(attr)), 0, 0, 0, 0))
+}
+
+func pthread_mutex_lock(mutex *pthread_mutex_t) int32 {
+	return int32(call5(pthread_mutex_lockABI0, uintptr(unsafe.Pointer(mutex)), 0, 0, 0, 0))
+}
+
+func pthread_mutex_unlock(mutex *pthread_mutex_t) int32 {
+	return int32(call5(pthread_mutex_unlockABI0, uintptr(unsafe.Pointer(mutex)), 0, 0, 0, 0))
+}
+
+func pthread_cond_broadcast(cond *pthread_cond_t) int32 {
+	return int32(call5(pthread_cond_broadcastABI0, uintptr(unsafe.Pointer(cond)), 0, 0, 0, 0))
+}
+
+func pthread_setspecific(key pthread_key_t, value unsafe.Pointer) int32 {
+	return int32(call5(pthread_setspecificABI0, uintptr(key), uintptr(value), 0, 0, 0))
+}
+
+//go:linkname _malloc _malloc
+var _malloc uintptr
+var mallocABI0 = uintptr(unsafe.Pointer(&_malloc))
+
+//go:linkname _free _free
+var _free uintptr
+var freeABI0 = uintptr(unsafe.Pointer(&_free))
+
+//go:linkname _setenv _setenv
+var _setenv uintptr
+var setenvABI0 = uintptr(unsafe.Pointer(&_setenv))
+
+//go:linkname _unsetenv _unsetenv
+var _unsetenv uintptr
+var unsetenvABI0 = uintptr(unsafe.Pointer(&_unsetenv))
+
+//go:linkname _sigfillset _sigfillset
+var _sigfillset uintptr
+var sigfillsetABI0 = uintptr(unsafe.Pointer(&_sigfillset))
+
+//go:linkname _nanosleep _nanosleep
+var _nanosleep uintptr
+var nanosleepABI0 = uintptr(unsafe.Pointer(&_nanosleep))
+
+//go:linkname _abort _abort
+var _abort uintptr
+var abortABI0 = uintptr(unsafe.Pointer(&_abort))
+
+//go:linkname _pthread_attr_init _pthread_attr_init
+var _pthread_attr_init uintptr
+var pthread_attr_initABI0 = uintptr(unsafe.Pointer(&_pthread_attr_init))
+
+//go:linkname _pthread_create _pthread_create
+var _pthread_create uintptr
+var pthread_createABI0 = uintptr(unsafe.Pointer(&_pthread_create))
+
+//go:linkname _pthread_detach _pthread_detach
+var _pthread_detach uintptr
+var pthread_detachABI0 = uintptr(unsafe.Pointer(&_pthread_detach))
+
+//go:linkname _pthread_sigmask _pthread_sigmask
+var _pthread_sigmask uintptr
+var pthread_sigmaskABI0 = uintptr(unsafe.Pointer(&_pthread_sigmask))
+
+//go:linkname _pthread_self _pthread_self
+var _pthread_self uintptr
+var pthread_selfABI0 = uintptr(unsafe.Pointer(&_pthread_self))
+
+//go:linkname _pthread_get_stacksize_np _pthread_get_stacksize_np
+var _pthread_get_stacksize_np uintptr
+var pthread_get_stacksize_npABI0 = uintptr(unsafe.Pointer(&_pthread_get_stacksize_np))
+
+//go:linkname _pthread_attr_getstacksize _pthread_attr_getstacksize
+var _pthread_attr_getstacksize uintptr
+var pthread_attr_getstacksizeABI0 = uintptr(unsafe.Pointer(&_pthread_attr_getstacksize))
+
+//go:linkname _pthread_attr_setstacksize _pthread_attr_setstacksize
+var _pthread_attr_setstacksize uintptr
+var pthread_attr_setstacksizeABI0 = uintptr(unsafe.Pointer(&_pthread_attr_setstacksize))
+
+//go:linkname _pthread_attr_destroy _pthread_attr_destroy
+var _pthread_attr_destroy uintptr
+var pthread_attr_destroyABI0 = uintptr(unsafe.Pointer(&_pthread_attr_destroy))
+
+//go:linkname _pthread_mutex_lock _pthread_mutex_lock
+var _pthread_mutex_lock uintptr
+var pthread_mutex_lockABI0 = uintptr(unsafe.Pointer(&_pthread_mutex_lock))
+
+//go:linkname _pthread_mutex_unlock _pthread_mutex_unlock
+var _pthread_mutex_unlock uintptr
+var pthread_mutex_unlockABI0 = uintptr(unsafe.Pointer(&_pthread_mutex_unlock))
+
+//go:linkname _pthread_cond_broadcast _pthread_cond_broadcast
+var _pthread_cond_broadcast uintptr
+var pthread_cond_broadcastABI0 = uintptr(unsafe.Pointer(&_pthread_cond_broadcast))
+
+//go:linkname _pthread_setspecific _pthread_setspecific
+var _pthread_setspecific uintptr
+var pthread_setspecificABI0 = uintptr(unsafe.Pointer(&_pthread_setspecific))

vendor/github.com/ebitengine/purego/internal/fakecgo/symbols_darwin.go

@@ -0,0 +1,27 @@
+// Code generated by 'go generate' with gen.go. DO NOT EDIT.
+
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+//go:cgo_import_dynamic purego_malloc malloc "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_free free "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_setenv setenv "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_unsetenv unsetenv "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_sigfillset sigfillset "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_nanosleep nanosleep "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_abort abort "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_create pthread_create "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_detach pthread_detach "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_self pthread_self "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_get_stacksize_np pthread_get_stacksize_np "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_attr_setstacksize pthread_attr_setstacksize "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "/usr/lib/libSystem.B.dylib"
+//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "/usr/lib/libSystem.B.dylib"

vendor/github.com/ebitengine/purego/internal/fakecgo/symbols_freebsd.go

@@ -0,0 +1,27 @@
+// Code generated by 'go generate' with gen.go. DO NOT EDIT.
+
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+//go:cgo_import_dynamic purego_malloc malloc "libc.so.7"
+//go:cgo_import_dynamic purego_free free "libc.so.7"
+//go:cgo_import_dynamic purego_setenv setenv "libc.so.7"
+//go:cgo_import_dynamic purego_unsetenv unsetenv "libc.so.7"
+//go:cgo_import_dynamic purego_sigfillset sigfillset "libc.so.7"
+//go:cgo_import_dynamic purego_nanosleep nanosleep "libc.so.7"
+//go:cgo_import_dynamic purego_abort abort "libc.so.7"
+//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_create pthread_create "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_self pthread_self "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_get_stacksize_np pthread_get_stacksize_np "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_attr_setstacksize pthread_attr_setstacksize "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libpthread.so"
+//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libpthread.so"

vendor/github.com/ebitengine/purego/internal/fakecgo/symbols_linux.go

@@ -0,0 +1,27 @@
+// Code generated by 'go generate' with gen.go. DO NOT EDIT.
+
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+package fakecgo
+
+//go:cgo_import_dynamic purego_malloc malloc "libc.so.6"
+//go:cgo_import_dynamic purego_free free "libc.so.6"
+//go:cgo_import_dynamic purego_setenv setenv "libc.so.6"
+//go:cgo_import_dynamic purego_unsetenv unsetenv "libc.so.6"
+//go:cgo_import_dynamic purego_sigfillset sigfillset "libc.so.6"
+//go:cgo_import_dynamic purego_nanosleep nanosleep "libc.so.6"
+//go:cgo_import_dynamic purego_abort abort "libc.so.6"
+//go:cgo_import_dynamic purego_pthread_attr_init pthread_attr_init "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_create pthread_create "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_detach pthread_detach "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_sigmask pthread_sigmask "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_self pthread_self "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_get_stacksize_np pthread_get_stacksize_np "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_attr_getstacksize pthread_attr_getstacksize "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_attr_setstacksize pthread_attr_setstacksize "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_attr_destroy pthread_attr_destroy "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_mutex_lock pthread_mutex_lock "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_mutex_unlock pthread_mutex_unlock "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_cond_broadcast pthread_cond_broadcast "libpthread.so.0"
+//go:cgo_import_dynamic purego_pthread_setspecific pthread_setspecific "libpthread.so.0"

vendor/github.com/ebitengine/purego/internal/fakecgo/trampolines_amd64.s

@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: Apache-2.0
+// SPDX-FileCopyrightText: 2022 The Ebitengine Authors
+
+//go:build darwin || linux || freebsd
+
+/*
+trampoline for emulating required C functions for cgo in go (see cgo.go)
+(we convert cdecl calling convention to go and vice-versa)
+
+Since we're called from go and call into C we can cheat a bit with the calling conventions:
+ - in go all the registers are caller saved
+ - in C we have a couple of callee saved registers
+
+=> we can use BX, R12, R13, R14, R15 instead of the stack
+
+C Calling convention cdecl used here (we only need integer args):
+1. arg: DI
+2. arg: SI
+3. arg: DX
+4. arg: CX
+5. arg: R8
+6. arg: R9
+We don't need floats with these functions -> AX=0
+return value will be in AX
+*/
+#include "textflag.h"
+#include "go_asm.h"
+
+// these trampolines map the gcc ABI to Go ABI and then calls into the Go equivalent functions.
+
+TEXT x_cgo_init_trampoline(SB), NOSPLIT, $16
+	MOVQ DI, AX
+	MOVQ SI, BX
+	MOVQ ·x_cgo_init_call(SB), DX
+	MOVQ (DX), CX
+	CALL CX
+	RET
+
+TEXT x_cgo_thread_start_trampoline(SB), NOSPLIT, $8
+	MOVQ DI, AX
+	MOVQ ·x_cgo_thread_start_call(SB), DX
+	MOVQ (DX), CX
+	CALL CX
+	RET
+
+TEXT x_cgo_setenv_trampoline(SB), NOSPLIT, $8
+	MOVQ DI, AX
+	MOVQ ·x_cgo_setenv_call(SB), DX
+	MOVQ (DX), CX
+	CALL CX
+	RET
+
+TEXT x_cgo_unsetenv_trampoline(SB), NOSPLIT, $8
+	MOVQ DI, AX
+	MOVQ ·x_cgo_unsetenv_call(SB), DX
+	MOVQ (DX), CX
+	CALL CX
+	RET
+
+TEXT x_cgo_notify_runtime_init_done_trampoline(SB), NOSPLIT, $0
+	CALL ·x_cgo_notify_runtime_init_done(SB)
+	RET
+
+TEXT x_cgo_bindm_trampoline(SB), NOSPLIT, $0
+	CALL ·x_cgo_bindm(SB)
+	RET
+
+// func setg_trampoline(setg uintptr, g uintptr)
+TEXT ·setg_trampoline(SB), NOSPLIT, $0-16
+	MOVQ G+8(FP), DI
+	MOVQ setg+0(FP), BX
+	XORL AX, AX
+	CALL BX
+	RET
+
+TEXT threadentry_trampoline(SB), NOSPLIT, $16
+	MOVQ DI, AX
+	MOVQ ·threadentry_call(SB), DX
+	MOVQ (DX), CX
+	CALL CX
+	RET
+
+TEXT ·call5(SB), NOSPLIT, $0-56
+	MOVQ fn+0(FP), BX
+	MOVQ a1+8(FP), DI
+	MOVQ a2+16(FP), SI
+	MOVQ a3+24(FP), DX
+	MOVQ a4+32(FP), CX
+	MOVQ a5+40(FP), R8
+
+	XORL AX, AX // no floats
+
+	PUSHQ BP       // save BP
+	MOVQ  SP, BP   // save SP inside BP bc BP is callee-saved
+	SUBQ  $16, SP  // allocate space for alignment
+	ANDQ  $-16, SP // align on 16 bytes for SSE
+
+	CALL BX
+
+	MOVQ BP, SP // get SP back
+	POPQ BP     // restore BP
+
+	MOVQ AX, ret+48(FP)
+	RET