func DepthMask(flag bool) {
	C.glowDepthMask(gpDepthMask, (C.GLboolean)(boolToInt(flag)))
}
func DepthMask(flag bool) {
	C.glowDepthMask(gpDepthMask, (C.GLboolean)(boolToInt(flag)))
}
// enable or disable writing into the depth buffer