http://bugs.winehq.org/show_bug.cgi?id=30958
--- Comment #3 from Kevin Meyer billy65bob@gmail.com 2012-06-21 01:37:01 CDT --- It seems I changed the offscreen renderer to backbuffer to work around another issue with another game (gives me a black screen with GLSL off and an increased PGMSIZE).
I set that back to fbo and it seems to be rendering fine with the increased shader size limit; I can see the ground, trees, various particle effects and the player... But the game's no accepting any input from my mouse outside the menus, so I'm not really in a position to test beyond that.