//4. function to set callback
// stores the address of external callback delegate, but gives to OpenGL the address of the internal one
public static void gluTessCallback([In] Glu.GLUtesselator tess, int which, [In] TessCombineCallback_2 func)
{
unsafe
{
newTessCombineCallback = func;
internalCombCB = new IntTessCombCB(InternalTessCombineCallback);
__gluTessCallback(tess, which, internalCombCB);
}
}
private static extern unsafe void __gluTessCallback(Glu.GLUtesselator tess, int which, IntTessCombCB cb);