http://bugs.winehq.org/show_bug.cgi?id=9717
--- Comment #50 from Rico kgbricola@web.de 2008-11-02 09:33:49 --- This bug is only with OffscreenRenderingMode = backbuffer and it isn't solved yet. This could be the reason http://bugs.winehq.org/show_bug.cgi?id=6351#c18 . Probably we should mark it as wont fix because there is only a dirty workaround and no real way to solve it?
Using fbo let the game look fine (some polygons are flickering).
Using pbuffer then the black shadows are in a total wrong position.