http://bugs.winehq.org/show_bug.cgi?id=15644
--- Comment #18 from H. Verbeet hverbeet@gmail.com 2008-10-19 12:13:50 --- Created an attachment (id=16748) --> (http://bugs.winehq.org/attachment.cgi?id=16748) depth_blt patch
How does this work? It should fix the GL error, but chances are it won't solve the rest of the problem.