<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [i965] Compiler backend uses too much stack with Alien: Isolation" href="https://bugs.freedesktop.org/show_bug.cgi?id=93840#c29">Comment # 29</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [i965] Compiler backend uses too much stack with Alien: Isolation" href="https://bugs.freedesktop.org/show_bug.cgi?id=93840">bug 93840</a> from <a class="email" href="mailto:d.spitznagel@goodbytez.de" title="Darius Spitznagel <d.spitznagel@goodbytez.de>"> Darius Spitznagel</a> <pre>> Are you forcing GL 4.3 / compute on, like earlier? [1] > > If not, which Mesa version do you use? Haswell officially provides GL 4.2 > in Mesa 17.0.0 (required FP64 came on Jan 12th), which was released 2 days > ago. Only with latest Mesa git version Haswell officially supports GL 4.5 > (Jan 16th commit). Compute shaders come in GL 4.3. > > [1] Game will start, but doesn't render correctly if compute shader support > is missing: > <a class="bz_bug_link bz_status_RESOLVED bz_closed" title="RESOLVED FIXED - [radeonsi] Alien: Isolation feature request" href="show_bug.cgi?id=93144#c31">https://bugs.freedesktop.org/show_bug.cgi?id=93144#c31</a> I use Mesa 17.0.0 with no override. Mesa 17.0.0 exposes OpenGL 4.5 for Haswell. The release notes at <a href="http://mesa3d.org">http://mesa3d.org</a> are totally WRONG!!! Look here... <a href="https://cgit.freedesktop.org/mesa/mesa/commit/?id=d2590eb65ff28a9cbd592353d15d7e6cbd2c6fc6">https://cgit.freedesktop.org/mesa/mesa/commit/?id=d2590eb65ff28a9cbd592353d15d7e6cbd2c6fc6</a> Clone branch mesa-17.0.0 and search for "Haswell" and you will see it. IMPORTANT: You also need a newer kernel otherwise CS will not be exposed due to missing "pipelined register writes" support (see intel_extensions.c) Kernel 4.8 should be fine. So I use no magic but Matts patch and some others for Divinity: OS. > Also, which exact CPU model do you have? Intel(R) Core(TM) i7-4770R CPU @ 3.20GHz > Game needs to know when the parallel shader compilation has finished. > That's an extension on top of GL 4.5: > <a href="https://www.khronos.org/registry/OpenGL/extensions/ARB/">https://www.khronos.org/registry/OpenGL/extensions/ARB/</a> > ARB_parallel_shader_compile.txt > > Game needs to specifically have support for that. AHA, very interesting! Thanks for this info. > That uses gallium / LLVM backend. Maybe it uses less stack, or used at that > point, and would now also run out of stack. I know. > 300-400 KB of stack is ridiculously low amount of stack if there's something > that actually uses it. Game cannot assume that driver will use less than > that (game itself will use some of that stack too). A good point to look what others do.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>