(In reply to Nicolai H�hnle from comment #5) > So, I've looked into this again out of curiosity, because I do have an LLVM > patch that can be used to work around this. However, the patch introduces > some inefficiencies, and this is a game bug: it is clear from playing with > the provided apitrace that a derivative is taken after a non-uniform > discard/kill, which is undefined behaviour in GLSL. > > Does anybody paying attention to this bug report know of a way to contact > the game developer about this? Unfortunately there seems to be no bugtracker. The list of (core) devs can be found on their homepage http://www.instinctgames.com/#c-about-us together with email info@instinctgames.com and phone +20222913556 though. They are apparently also use Twitter: https://twitter.com/instinctgames Facebook: https://www.facebook.com/InstinctGames Linkedin: https://www.linkedin.com/company/instinct-games I could find the linkedin profile of one of the graphics engine programmers too: https://www.linkedin.com/in/mohammad-yusuf-2b7531a7