[Bug 98578] AMDGPU white glitches in some games

[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

Lukas Jirkovsky <l.jirkovsky@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
                   |org                         |.org
          Component|Drivers/Vulkan/radeon       |Drivers/Gallium/radeonsi
         QA Contact|mesa-dev@lists.freedesktop. |dri-devel@lists.freedesktop
                   |org                         |.org

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #1 from Lukas Jirkovsky <l.jirkovsky@gmail.com> ---
Created attachment 127733
  --> https://bugs.freedesktop.org/attachment.cgi?id=127733&action=edit
glxinfo

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #2 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Hi Lukas, thanks for the report. People often use Google Drive to upload
traces, that would be helpful.

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #3 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Nicolai Hähnle from comment #2)
> Hi Lukas, thanks for the report. People often use 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=30894

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #4 from Lukas Jirkovsky <l.jirkovsky@gmail.com> ---
I was able to get a smaller trace:
https://drive.google.com/open?id=0B2YvkwbBDwKYY1pPaUh0T1dlWjQ

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.

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #5 from Lukas Jirkovsky <l.jirkovsky@gmail.com> ---
Created attachment 127735
  --> https://bugs.freedesktop.org/attachment.cgi?id=127735&action=edit
the glitch on the last frame of the trace

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #6 from Lukas Jirkovsky <l.jirkovsky@gmail.com> ---
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 liquid
dripping and it's all covered with white specks. It may be a different problem,
but it looks very similar to the one in Ethan Carter.

https://drive.google.com/open?id=0B2YvkwbBDwKYTzI4Q2V6QzNSWXM

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #7 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Thanks for the trace, I can reproduce this and will look into it.

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #8 from Nicolai Hähnle <nhaehnle@gmail.com> ---
This took a while to track down. There is a shader (source @9633678, linked
into program 1127) which relies on -inf * +F == -inf. LLVM transforms the
shader in such a way that the result becomes a NaN instead (visible at a single
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 https://reviews.llvm.org/D26602.

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

--- Comment #9 from Lukas Jirkovsky <l.jirkovsky@gmail.com> ---
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 your
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.

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[Bug 98578] AMDGPU white glitches in some games

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https://bugs.freedesktop.org/show_bug.cgi?id=98578

Nicolai Hähnle <nhaehnle@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #10 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Fixed in LLVM trunk r288506.

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