http://bugs.winehq.org/show_bug.cgi?id=33964
--- Comment #7 from Henri Verbeet hverbeet@gmail.com --- Created attachment 46841 --> http://bugs.winehq.org/attachment.cgi?id=46841&action=edit patch
Does the attached patch make it any better? Looking at the driver source a bit, it looks like reads from gl_FragData[0] may cause a software fallback.