vendor dependencies, make some changes to how input is done

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

@@ -0,0 +1,36 @@
+// Copyright 2014 Hajime Hoshi
+//
+// 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 graphics
+
+// InternalImageSize returns a nearest appropriate size as an internal image.
+func InternalImageSize(x int) int {
+	// minInternalImageSize is the minimum size of internal images (texture/framebuffer).
+	//
+	// For example, the image size less than 15 is not supported on some iOS devices.
+	// See also: https://stackoverflow.com/questions/15935651
+	const minInternalImageSize = 16
+
+	if x <= 0 {
+		panic("graphics: x must be positive")
+	}
+	if x < minInternalImageSize {
+		return minInternalImageSize
+	}
+	r := 1
+	for r < x {
+		r <<= 1
+	}
+	return r
+}