Golang img to sdl texture

img2tex.go

func imgFileToTexture(renderer *sdl.Renderer, filename string) *sdl.Texture {

	infile, err := os.Open(filename)
	if err != nil {
		panic(err)
	}
	defer infile.Close()

	img, err := png.Decode(infile)
	if err != nil {
		panic(err)
	}

	w := img.Bounds().Max.X
	h := img.Bounds().Max.Y

	pixels := make([]byte, w*h*4)
	bIndex := 0
	for y := 0; y < h; y++ {
		for x := 0; x < w; x++ {
			r, g, b, a := img.At(x, y).RGBA()
			pixels[bIndex] = byte(r / 256)
			bIndex++
			pixels[bIndex] = byte(g / 256)
			bIndex++
			pixels[bIndex] = byte(b / 256)
			bIndex++
			pixels[bIndex] = byte(a / 256)
			bIndex++
		}
	}
	tex := pixelsToTexture(renderer, pixels, w, h)
	err = tex.SetBlendMode(sdl.BLENDMODE_BLEND)
	if err != nil {
		panic(err)
	}
	return tex
}