func NormalPointer(xtype uint32, stride int32, pointer unsafe.Pointer) {
	syscall.Syscall(gpNormalPointer, 3, uintptr(xtype), uintptr(stride), uintptr(pointer))
}
func NormalPointer(xtype uint32, stride int32, pointer unsafe.Pointer) {
	syscall.Syscall(gpNormalPointer, 3, uintptr(xtype), uintptr(stride), uintptr(pointer))
}
func NormalPointer ( xtype uint32 , stride int32 , pointer unsafe . Pointer ) { syscall . Syscall ( gpNormalPointer , 3 , uintptr ( xtype ) , uintptr ( stride ) , uintptr ( pointer ) ) }
// define an array of normals
define an array of normals