func DepthRangef(n float32, f float32) {
	C.glowDepthRangef(gpDepthRangef, (C.GLfloat)(n), (C.GLfloat)(f))
}
func DepthRangef(n float32, f float32) {
	C.glowDepthRangef(gpDepthRangef, (C.GLfloat)(n), (C.GLfloat)(f))
}
// specify mapping of depth values from normalized device coordinates to window coordinates