https://bugs.freedesktop.org/show_bug.cgi?id=30488
--- Comment #5 from Scott Moreau oreaus@gmail.com 2010-12-14 07:04:01 PST --- (In reply to comment #3)
I think I can see the problem. Wine uses the subset of ARB_texture_rg that depends on ARB_texture_float, i.e. it can only be used if ARB_texture_float is supported, but Wine doesn't appear to care and uses it anyway. This should be fixed in Wine.
Does setting this environment variable like this help?
MESA_EXTENSION_OVERRIDE=-GL_ARB_texture_rg
No, the game still exits fullscreen when it gets to the menu screen and goes to a ~640x480 black box in the upper left of the screen, displaying the game cursor.