func LineStipple(factor int32, pattern uint16) {
	C.glowLineStipple(gpLineStipple, (C.GLint)(factor), (C.GLushort)(pattern))
}
func LineStipple(factor int32, pattern uint16) {
	C.glowLineStipple(gpLineStipple, (C.GLint)(factor), (C.GLushort)(pattern))
}
// specify the line stipple pattern