internal/graphicsdriver/opengl/gl/package_notwindows.go
func NormalPointer(xtype uint32, stride int32, pointer unsafe.Pointer) {
	C.glowNormalPointer(gpNormalPointer, (C.GLenum)(xtype), (C.GLsizei)(stride), pointer)
}
func NormalPointer(xtype uint32, stride int32, pointer unsafe.Pointer) {
	C.glowNormalPointer(gpNormalPointer, (C.GLenum)(xtype), (C.GLsizei)(stride), pointer)
}
// define an array of normals