Example #1
0
func ImageData(img image.Image) (gl.Sizei, gl.Sizei, gl.Enum, gl.Enum, gl.Pointer) {
	switch img := img.(type) {
	case *image.NRGBA:
		return gl.Sizei(img.Rect.Dx()), gl.Sizei(img.Rect.Dy()), gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&img.Pix[0])
	case *image.RGBA:
		return gl.Sizei(img.Rect.Dx()), gl.Sizei(img.Rect.Dy()), gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&img.Pix[0])
	default:
		panic(reflect.TypeOf(img))
	}
	return 0, 0, gl.RGB, gl.UNSIGNED_BYTE, nil
}
Example #2
0
func ArrayPtr(data interface{}) (gl.Pointer, gl.Sizeiptr) {
	var size gl.Sizeiptr
	var ptr gl.Pointer
	switch data := data.(type) {
	case []float64:
		duplicate := make([]gl.Float, len(data))
		for i, v := range data {
			duplicate[i] = gl.Float(v)
		}
		ptr, size = ArrayPtr(duplicate)
	case []float32:
		if len(data) == 0 {
			size = 0
			ptr = gl.Pointer(nil)
		} else {
			var v float32
			size = gl.Sizeiptr(len(data) * int(unsafe.Sizeof(v)))
			ptr = gl.Pointer(&data[0])
		}
	case []gl.Float:
		if len(data) == 0 {
			size = 0
			ptr = gl.Pointer(nil)
		} else {
			var v gl.Float
			size = gl.Sizeiptr(len(data) * int(unsafe.Sizeof(v)))
			ptr = gl.Pointer(&data[0])
		}
	case []int16:
		if len(data) == 0 {
			size = 0
			ptr = gl.Pointer(nil)
		} else {
			var v int16
			size = gl.Sizeiptr(len(data) * int(unsafe.Sizeof(v)))
			ptr = gl.Pointer(&data[0])
		}
	case []gl.Ushort:
		if len(data) == 0 {
			size = 0
			ptr = gl.Pointer(nil)
		} else {
			var v gl.Ushort
			size = gl.Sizeiptr(len(data) * int(unsafe.Sizeof(v)))
			ptr = gl.Pointer(&data[0])
		}
	case []int:
		duplicate := make([]gl.Ushort, len(data))
		for i, v := range data {
			duplicate[i] = gl.Ushort(v)
		}
		ptr, size = ArrayPtr(duplicate)
	case []gl.Int:
		if len(data) == 0 {
			size = 0
			ptr = gl.Pointer(nil)
		} else {
			var v gl.Int
			size = gl.Sizeiptr(len(data) * int(unsafe.Sizeof(v)))
			ptr = gl.Pointer(&data[0])
		}
	default:
		panic(fmt.Sprintln("unknown data type:", reflect.TypeOf(data)))
	}
	return ptr, size
}