http://bugs.winehq.org/show_bug.cgi?id=19659
--- Comment #28 from Stefan Dösinger stefandoesinger@gmx.at 2010-03-04 15:52:53 --- Seems as if it doesn't have a GL context, or the context isn't valid. Can you add the following line after the context_acquire call:
ERR("context->valid: %s\n", context->valid ? "true" : "false"); (If I screwed up and this doesn't compile I'll attach a proper diff)