Rendering to OpenGL 'child windows' (small OpenGL views like in Google Earth) is a tricky operation for Wine. It has to do between differences between X11 and Windows. Anyway, the way this type of GL rendering works is that we render to an 'offscreen window' and we copy the result back to the main window of the application. This 'offscreen window' rendering mechanism uses the X Composite extension and GLX. Not all drivers support this properly (it is essentially the functionality needed to run compiz well). On Linux, the drivers from Nvidia and AMD support it and drivers which support DRI2 (DRI2 is a hard requirement). I don't think it is supported on OSX yet.
