func DepthRange(n float64, f float64) {
	C.glowDepthRange(gpDepthRange, (C.GLdouble)(n), (C.GLdouble)(f))
}
func DepthRange(n float64, f float64) {
	C.glowDepthRange(gpDepthRange, (C.GLdouble)(n), (C.GLdouble)(f))
}
// specify mapping of depth values from normalized device coordinates to window coordinates