http://bugs.winehq.org/show_bug.cgi?id=9492
--- Comment #22 from Stefan Dösinger stefandoesinger@gmx.at 2007-09-15 04:55:35 --- Yes, the shader indeed does not use the attributes that are sourced from the streams that are set to NULL. I will write a test for this and then find a fix. I think the best is just to add a NULL pointer check and let gl send the unused attributes to /dev/null.