http://bugs.winehq.org/show_bug.cgi?id=20988
--- Comment #4 from Henri Verbeet hverbeet@gmail.com 2009-12-11 05:30:30 --- (In reply to comment #2)
Created an attachment (id=25166)
--> (http://bugs.winehq.org/attachment.cgi?id=25166) [details]
Screenshot: incorrectly drawn textures in HL2 Lost Coast
Stefan or Ken may know more details, but this looks like a known OS X driver bug where the driver loses the contents of compressed sRGB textures in some case. As far as I know Apple knows about this but doesn't believe in fixing it. We have all kinds of nasty workarounds for issues like this in CrossOver Games, but in general those can't go into Wine due to being so ugly.