func setupScene() {
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.LIGHTING)
gl.ClearColor(0.5, 0.5, 0.5, 0.0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LEQUAL)
ambient := []float32{0.5, 0.5, 0.5, 1}
diffuse := []float32{1, 1, 1, 1}
lightPosition := []float32{-5, 5, 10, 0}
gl.Lightfv(gl.LIGHT0, gl.AMBIENT, &ambient[0])
gl.Lightfv(gl.LIGHT0, gl.DIFFUSE, &diffuse[0])
gl.Lightfv(gl.LIGHT0, gl.POSITION, &lightPosition[0])
gl.Enable(gl.LIGHT0)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Frustum(-1, 1, -1, 1, 1.0, 10.0)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
}
func newTexture(file string) uint32 {
imgFile, err := os.Open(file)
if err != nil {
panic(err)
}
img, _, err := image.Decode(imgFile)
if err != nil {
panic(err)
}
rgba := image.NewRGBA(img.Bounds())
if rgba.Stride != rgba.Rect.Size().X*4 {
panic("unsupported stride")
}
draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, draw.Src)
var texture uint32
gl.Enable(gl.TEXTURE_2D)
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
int32(rgba.Rect.Size().X),
int32(rgba.Rect.Size().Y),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Ptr(rgba.Pix))
return texture
}