func MakeTextureFromImageFile(filePath string) gl.Uint {
var file, err = os.Open(filePath)
var img image.Image
var tex gl.Uint
if err != nil {
panic(err)
}
defer file.Close()
img, _, err = image.Decode(file)
if err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
sw, sh := gl.Sizei(w), gl.Sizei(h)
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, h-1-y))
}
}
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGBA8, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFile(%v)", filePath)
return tex
}
func MakeTextureFromImageFloatsFile(filePath string, w, h int) gl.Uint {
var file, err = os.Open(filePath)
var tex gl.Uint
var pix = make([]gl.Float, w*h*3)
var fVal float32
var raw []uint8
var buf *bytes.Buffer
var i int
if err != nil {
panic(err)
}
defer file.Close()
raw, err = ioutil.ReadAll(file)
if err != nil {
panic(err)
}
buf = bytes.NewBuffer(raw)
for i = 0; (err == nil) && (i < len(pix)); i++ {
if err = binary.Read(buf, binary.LittleEndian, &fVal); err == io.EOF {
err = nil
break
} else if err == nil {
pix[i] = gl.Float(fVal)
}
}
if err != nil {
panic(err)
}
sw, sh := gl.Sizei(w), gl.Sizei(h)
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
gl.TexStorage2D(gl.TEXTURE_2D, 1, gl.RGB16F, sw, sh)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, sw, sh, gl.RGB, gl.FLOAT, gl.Pointer(&pix[0]))
gl.BindTexture(gl.TEXTURE_2D, 0)
PanicIfErrors("MakeTextureFromImageFloatsFile(%v)", filePath)
return tex
}
