https://bugs.winehq.org/show_bug.cgi?id=43057
--- Comment #9 from Henri Verbeet hverbeet@gmail.com --- (In reply to Józef Kucia from comment #6)
It would be interesting to know if the attached patch fixes the issue. It's a possible workaround for the Mesa bug.
For what it's worth, we'll want to make sure the Mesa bug gets fixed of course, but the patch seems legitimate enough.