//SaveTexture2D take a Texture2D and a filename and saves it as a png image.
func SaveTexture2D(t gl2.Texture2D, filename string) error {
file, err := os.OpenFile(filename, os.O_CREATE|os.O_RDWR, 0666)
defer file.Close()
if err != nil {
return err
}
lasttex := GetCurrentTexture2D()
defer lasttex.Bind()
t.Bind()
width, height := int(t.Width(0)), int(t.Height(0))
nrgba := image.NewRGBA(image.Rect(0, 0, width, height))
D(width, height)
var pixels []byte
internalformat := t.InternalFormat(0)
if internalformat == gl.RGBA8 {
pixels = make([]byte, width*height*4)
t.ReadPixels(0, 0, int32(width), int32(height), gl.RGBA, gl.UNSIGNED_BYTE, unsafe.Pointer(&pixels[0]))
for x := 0; x < len(pixels); x += 4 {
nrgba.SetRGBA((x/4)%width, height-(x/4)/width, color.RGBA{pixels[x], pixels[x+1], pixels[x+2], 255})
}
} else {
fmt.Errorf("unsupported texture type")
}
png.Encode(file, nrgba)
return nil
}
