Adding modding folder with a hacked build.

modding/hacked/editor/graphics/BitmapTexture.go

@@ -0,0 +1,91 @@
+package graphics
+
+import "github.com/inkyblackness/hacked/ui/opengl"
+
+// BitmapTexture wraps an OpenGL handle for a downloaded image.
+type BitmapTexture struct {
+	gl     opengl.OpenGL
+	handle uint32
+
+	width, height float32
+	u, v          float32
+
+	pixelData []byte
+}
+
+func powerOfTwo(value int) int {
+	result := 2
+
+	for (result < value) && (result < 0x1000) {
+		result *= 2
+	}
+
+	return result
+}
+
+// NewBitmapTexture downloads the provided raw data to OpenGL and returns a BitmapTexture instance.
+func NewBitmapTexture(gl opengl.OpenGL, width, height int, pixelData []byte) *BitmapTexture {
+	textureWidth := powerOfTwo(width)
+	textureHeight := powerOfTwo(height)
+	tex := &BitmapTexture{
+		gl:     gl,
+		handle: gl.GenTextures(1)[0],
+
+		width:  float32(width),
+		height: float32(height),
+
+		pixelData: pixelData,
+	}
+	tex.u = tex.width / float32(textureWidth)
+	tex.v = tex.height / float32(textureHeight)
+
+	paddedData := make([]byte, textureWidth*textureHeight)
+	for y := 0; y < height; y++ {
+		inStart := y * width
+		outOffset := y * textureWidth
+		for x := 0; x < width; x++ {
+			value := pixelData[inStart+x]
+			paddedData[outOffset] = value
+			outOffset++
+		}
+	}
+
+	gl.BindTexture(opengl.TEXTURE_2D, tex.handle)
+	gl.TexImage2D(opengl.TEXTURE_2D, 0, opengl.RED, int32(textureWidth), int32(textureHeight),
+		0, opengl.RED, opengl.UNSIGNED_BYTE, paddedData)
+	gl.TexParameteri(opengl.TEXTURE_2D, opengl.TEXTURE_MAG_FILTER, opengl.NEAREST)
+	gl.TexParameteri(opengl.TEXTURE_2D, opengl.TEXTURE_MIN_FILTER, opengl.NEAREST)
+	gl.GenerateMipmap(opengl.TEXTURE_2D)
+	gl.BindTexture(opengl.TEXTURE_2D, 0)
+
+	return tex
+}
+
+// Dispose releases the OpenGL texture.
+func (tex *BitmapTexture) Dispose() {
+	if tex.handle != 0 {
+		tex.gl.DeleteTextures([]uint32{tex.handle})
+		tex.handle = 0
+	}
+}
+
+// Handle returns the texture handle.
+func (tex *BitmapTexture) Handle() uint32 {
+	return tex.handle
+}
+
+// PixelData returns the original paletted pixel data.
+func (tex *BitmapTexture) PixelData() []byte {
+	return tex.pixelData
+}
+
+// Size returns the dimensions of the bitmap, in pixels.
+func (tex *BitmapTexture) Size() (width, height float32) {
+	return tex.width, tex.height
+}
+
+// UV returns the maximum U and V values for the bitmap. The bitmap will be
+// stored in a power-of-two texture, which may be larger than the bitmap.
+func (tex *BitmapTexture) UV() (u, v float32) {
+	return tex.u, tex.v
+}