[Bug 98776] [regression] Rendering glitches in Life Is Strange

[Bug 98776] [regression] Rendering glitches in Life Is Strange

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

            Bug ID: 98776
           Summary: [regression] Rendering glitches in Life Is Strange
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: daniel@constexpr.org
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 128065
  --> https://bugs.freedesktop.org/attachment.cgi?id=128065&action=edit
Glitched car windows

The game Life Is Strange has various rendering glitches with current mesa
master.

I have recorded an apitrace of the game:
 http://constexpr.org/tmp/LifeIsStrange-radeonsi.trace.xz (124 MiB)

The trace contains garbage geometry that is not there in the game (probably due
to persistent coherent mappings - the game crashes with
MESA_EXTENSION_OVERRIDE=-GL_ARB_buffer_storage), but the glitched car windows
seen in the screenshot are visible. I've tracked the origin of the glitches to
e.g. draw call 4741838.

All of the glitches go away when reverting commit 74e39de "radeonsi: set
IF_THRESHOLD to 3" while https://patchwork.freedesktop.org/patch/122101/ does
not help, so this is likely related to bug #98761.

GPU: R9 380X (tonga)
Kernel: 4.8.7-gentoo
Mesa: git-0c85d2f
LLVM: r287273

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[Bug 98776] [regression] Rendering glitches in Life Is Strange

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

--- Comment #1 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 128066
  --> https://bugs.freedesktop.org/attachment.cgi?id=128066&action=edit
Glitched shoreline

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[Bug 98776] [regression] Rendering glitches in Life Is Strange

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

--- Comment #2 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 128067
  --> https://bugs.freedesktop.org/attachment.cgi?id=128067&action=edit
Glitched face

There are more examples of glitches that all look slightly different - however
the glitches always affect the same objects and the glitch for each objects
looks more or less the same for each run. All glitches that I have noticed are
fixed by reverting the mentioned commit.

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[Bug 98776] [regression] Rendering glitches in Life Is Strange

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

--- Comment #3 from Daniel Scharrer <daniel@constexpr.org> ---
Reverting LLVM r286766 "AMDGPU: Implement SGPR spilling with scalar stores"
(while not reverting anything in Mesa) also fixes the glitches.

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[Bug 98776] [regression] Rendering glitches in Life Is Strange

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

--- Comment #4 from Arek Ruśniak <arek.rusi@gmail.com> ---
Daniel I can't reproduce this on verde/polaris probably this can be HW specific
issue. 
And I can't replay your trace because apitrace crashes with:

4108417: warning: region 0x7f26ce079000-0x7f26ce07a188 intersects existing
region 0x7f26ce07a000-0x7f26ce07a120
glretrace: /build/apitrace/src/apitrace-7.1/retrace/retrace_swizzle.cpp:166:
std::map<long long unsigned int, retrace::Region>::iterator
retrace::lookupRegion(long long unsigned int): Assertion `contains(it,
address)' failed.
apitrace: warning: caught signal 6
4108425: error: caught an unhandled exception
glretrace+0x234eec
/usr/lib/libpthread.so.0+0x1107f
/usr/lib/libc.so.6: gsignal+0xcf
/usr/lib/libc.so.6: abort+0x169
/usr/lib/libc.so.6+0x2bea6
/usr/lib/libc.so.6: __assert_fail+0x41
glretrace+0xd9ef
glretrace+0xe7cb
glretrace+0xdb15
glretrace+0xd7e8
glretrace+0xc48b
glretrace+0xcbe9
glretrace+0xce91
/usr/lib/libpthread.so.0+0x7453
/usr/lib/libc.so.6: clone+0x5e
?
apitrace: info: taking default action for signal 6
Aborted (core dumped)

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[Bug 98776] [regression] Rendering glitches in Life Is Strange

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https://bugs.freedesktop.org/show_bug.cgi?id=98776

Daniel Scharrer <daniel@constexpr.org> changed:

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

--- Comment #5 from Daniel Scharrer <daniel@constexpr.org> ---
Everything renders fine with LLVM r289080 and Mesa git-31f988a9d6.

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