(In reply to Nicolai Hähnle from comment #11) > Actually, I suspect we do have a related bug here in the Mesa state tracker, > but you definitely need to fix that geometry shader. Oh I did not know that, I will fix the shaders and report back. I can mirror Ilias observation, all blob drivers that I have run this on features the latch behaviour (nVidia windows, AMD windows, nVidia Linux). Cheers, Jakob.