| What | Removed | Added |
|---|---|---|
| Assignee | mesa-dev@lists.freedesktop.org | dri-devel@lists.freedesktop.org |
| Component | Drivers/Vulkan/radeon | Drivers/Gallium/radeonsi |
| QA Contact | mesa-dev@lists.freedesktop.org | dri-devel@lists.freedesktop.org |
Created attachment 127733 [details]<=
/a>
glxinfo
Hi Lukas, thanks for the report. People often use Google Drive= to upload traces, that would be helpful.
(In reply to Nicolai H=C3=A4hnle from comment #2) > Hi Lukas, thanks for the report. People often us= e Google Drive to upload > traces, that would be helpful. I recently files a LLVM bug that looks similar(ish) corruption wise (small squares). If this started recently then maybe it's - https://llvm.org/= bugs/show_bug.cgi?id=3D30894
I was able to get a smaller trace: https://drive.google.com/open?id=3D0B2YvkwbBDwKYY1pPaUh0T1dlWjQ The glitch appears on the last frame on the top of the tower for me. See the attached screenshot. I can't tell for sure, but according to the update logs it must have been occurring with llvm 282xxx, too.
Created [details]
the glitch on the last frame of the trace
Another trace (a big one), this time from Dreamfall Chapters. = There are some small white glitches throughout the trace (which look a bit different than = the reported glitch), but at the end of the trace there's supposed to be a liqu= id dripping and it's all covered with white specks. It may be a different prob= lem, but it looks very similar to the one in Ethan Carter. https://drive.google.com/open?id=3D0B2YvkwbBDwKYTzI4Q2V6QzNSWXM
Thanks for the trace, I can reproduce this and will look into = it.
This took a while to track down. There is a shader (source = 4;9633678, linked into program 1127) which relies on -inf * +F =3D=3D -inf. LLVM transforms t= he shader in such a way that the result becomes a NaN instead (visible at a si= ngle pixel @ 953,0 in the final frame of the trimmed trace at @14722003)= , which then propagates to an ugly white square in post-processing. The LLVM transform is simply incorrect and fixed by h= ttps://reviews.llvm.org/D26602.
Nicolai, you are awesome! I tried the patch and haven't seen a= single glitch in The Vanishing of Ethan Carter. I noticed one interesting thing. With current llvm (r286840), I got glitches all over the screen making the game absolutely unplayable. However, with yo= ur patch, all glitches (both old and the new) are fixed. I tried Dreamfall Chapters, too. However, it's seriously broken with current llvm, so I can't provide any results. But given the fact Ethan Carter works fine with the patch, it's likely it's a different issue after all.
| What | Removed | Added |
|---|---|---|
| Resolution | --- | FIXED |
| Status | NEW | RESOLVED |