func PolygonOffset(factor float32, units float32) {
	C.glowPolygonOffset(gpPolygonOffset, (C.GLfloat)(factor), (C.GLfloat)(units))
}
func PolygonOffset(factor float32, units float32) {
	C.glowPolygonOffset(gpPolygonOffset, (C.GLfloat)(factor), (C.GLfloat)(units))
}
// set the scale and units used to calculate depth values