vendor dependencies, make some changes to how input is done

vendor/github.com/hajimehoshi/ebiten/v2/internal/ui/graphics.go

@@ -0,0 +1,129 @@
+// Copyright 2022 The Ebiten Authors
+//
+// 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.
+
+package ui
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
+)
+
+type graphicsDriverCreator interface {
+	newAuto() (graphicsdriver.Graphics, GraphicsLibrary, error)
+	newOpenGL() (graphicsdriver.Graphics, error)
+	newDirectX() (graphicsdriver.Graphics, error)
+	newMetal() (graphicsdriver.Graphics, error)
+	newPlayStation5() (graphicsdriver.Graphics, error)
+}
+
+func newGraphicsDriver(creator graphicsDriverCreator, graphicsLibrary GraphicsLibrary) (graphicsdriver.Graphics, GraphicsLibrary, error) {
+	if graphicsLibrary == GraphicsLibraryAuto {
+		envName := "EBITENGINE_GRAPHICS_LIBRARY"
+		env := os.Getenv(envName)
+		if env == "" {
+			// For backward compatibility, read the EBITEN_ version.
+			envName = "EBITEN_GRAPHICS_LIBRARY"
+			env = os.Getenv(envName)
+		}
+
+		switch env {
+		case "", "auto":
+			// Keep the automatic choosing.
+		case "opengl":
+			graphicsLibrary = GraphicsLibraryOpenGL
+		case "directx":
+			graphicsLibrary = GraphicsLibraryDirectX
+		case "metal":
+			graphicsLibrary = GraphicsLibraryMetal
+		case "playstation5":
+			graphicsLibrary = GraphicsLibraryPlayStation5
+		default:
+			return nil, 0, fmt.Errorf("ui: an unsupported graphics library is specified by the environment variable: %s", env)
+		}
+	}
+
+	switch graphicsLibrary {
+	case GraphicsLibraryAuto:
+		g, lib, err := creator.newAuto()
+		if err != nil {
+			return nil, 0, err
+		}
+		if g == nil {
+			return nil, 0, fmt.Errorf("ui: no graphics library is available")
+		}
+		return g, lib, nil
+	case GraphicsLibraryOpenGL:
+		g, err := creator.newOpenGL()
+		if err != nil {
+			return nil, 0, err
+		}
+		return g, GraphicsLibraryOpenGL, nil
+	case GraphicsLibraryDirectX:
+		g, err := creator.newDirectX()
+		if err != nil {
+			return nil, 0, err
+		}
+		return g, GraphicsLibraryDirectX, nil
+	case GraphicsLibraryMetal:
+		g, err := creator.newMetal()
+		if err != nil {
+			return nil, 0, err
+		}
+		return g, GraphicsLibraryMetal, nil
+	case GraphicsLibraryPlayStation5:
+		g, err := creator.newPlayStation5()
+		if err != nil {
+			return nil, 0, err
+		}
+		return g, GraphicsLibraryPlayStation5, nil
+	default:
+		return nil, 0, fmt.Errorf("ui: an unsupported graphics library is specified: %d", graphicsLibrary)
+	}
+}
+
+func (u *UserInterface) GraphicsDriverForTesting() graphicsdriver.Graphics {
+	return u.graphicsDriver
+}
+
+type GraphicsLibrary int
+
+const (
+	GraphicsLibraryAuto GraphicsLibrary = iota
+	GraphicsLibraryUnknown
+	GraphicsLibraryOpenGL
+	GraphicsLibraryDirectX
+	GraphicsLibraryMetal
+	GraphicsLibraryPlayStation5
+)
+
+func (g GraphicsLibrary) String() string {
+	switch g {
+	case GraphicsLibraryAuto:
+		return "Auto"
+	case GraphicsLibraryUnknown:
+		return "Unknown"
+	case GraphicsLibraryOpenGL:
+		return "OpenGL"
+	case GraphicsLibraryDirectX:
+		return "DirectX"
+	case GraphicsLibraryMetal:
+		return "Metal"
+	case GraphicsLibraryPlayStation5:
+		return "PlayStation 5"
+	default:
+		return fmt.Sprintf("GraphicsLibrary(%d)", g)
+	}
+}