http://bugs.winehq.org/show_bug.cgi?id=23840
--- Comment #4 from Austin English austinenglish@gmail.com 2010-07-30 14:00:38 --- Created an attachment (id=29928) --> (http://bugs.winehq.org/attachment.cgi?id=29928) workaround
This patch from Henri works around it. Apparently it's a bug in the glsl compiler.