func PolygonMode(face uint32, mode uint32) {
	syscall.Syscall(gpPolygonMode, 2, uintptr(face), uintptr(mode), 0)
}
func PolygonMode(face uint32, mode uint32) {
	syscall.Syscall(gpPolygonMode, 2, uintptr(face), uintptr(mode), 0)
}
// select a polygon rasterization mode