http://bugs.winehq.org/show_bug.cgi?id=22169
--- Comment #8 from Henri Verbeet hverbeet@gmail.com 2010-03-27 13:41:05 --- I think GL errors should be considered bugs, although in this case perhaps not a very important one. We shouldn't make invalid GL calls. I'll send a patch to change checkGLcall() to reflect that.