[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

            Bug ID: 93546
           Summary: Civilization 5 - Leaders in the diplomatic
                    interactions screen appear completely black
           Product: Mesa
           Version: 11.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: freedesktop@psydk.org
        QA Contact: dri-devel@lists.freedesktop.org

Hi,

I am playing Civilization 5 (the native port) on Ubuntu 15.10 with a Radeon
HD4870 and the default drivers shipped with Ubuntu (Mesa 11.0.2).

Everything works fine with the exception of a screen used for diplomatic
interactions which shows a nation leader. That nation leader appears completely
black and at the same time, the FPS drops a lot. Here is an example:
http://i.imgur.com/ma66qyT.jpg

I ran the game with LIBGL_ALWAYS_SOFTWARE set and tested with a random nation
leader. He was rendered correctly.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #1 from Laurent carlier <lordheavym@gmail.com> ---
Can you provide an apitrace?

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #2 from Hadrien <freedesktop@psydk.org> ---
I am having a hard time using apitrace on my x64 system with a 32 bits game. I
will be digging into this, but meanwhile, I can give some more information:

When I run the game from a terminal, I have those two errors repeated several
times:

EE ../../../../../../src/gallium/drivers/r600/r600_shader.c:158
r600_pipe_shader_create - translation from TGSI failed !
EE ../../../../../../src/gallium/drivers/r600/r600_state_common.c:809
r600_shader_select - Failed to build shader variant (type=1) -1

I saw in the source code that the shader can be dumped, so I will attach the
dump output to this bug ticket.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #3 from Hadrien <freedesktop@psydk.org> ---
Created attachment 120756
  --> https://bugs.freedesktop.org/attachment.cgi?id=120756&action=edit
Dump of the shader leading to a "translation from TGSI failed" error

Just after that shader output, I have those errors in the console:

EE ../../../../../../src/gallium/drivers/r600/r600_shader.c:158
r600_pipe_shader_create - translation from TGSI failed !
EE ../../../../../../src/gallium/drivers/r600/r600_state_common.c:809
r600_shader_select - Failed to build shader variant (type=1) -1

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #4 from Nicolai Hähnle <nhaehnle@gmail.com> ---
You need to produce a 32 bit build of apitrace. You'll need multiarch/multilib
support in your distribution and 32-bit variants of certain packages (e.g. on
Debian/Ubuntu, install the g++-multilib package, and libwhatever-dev:i386 if
you get error messages for libwhatever). When running cmake, add the following
parameters:

-DCMAKE_C_FLAGS=-m32 -DCMAKE_CXX_FLAGS=-m32 -DCMAKE_EXE_LINKER_FLAGS=-m32
-DENABLE_GUI=FALSE

Traces recorded using the 32 bit apitrace can be played back on apitrace of any
bitness.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #5 from Hadrien <freedesktop@psydk.org> ---
Thanks Nicolai. I've been able to produce a trace file but it is huge and the
replay gives some weird geometry rendering. However I've been able to get to
the point where the character is drawn. The geometry is still incorrect but at
least the pixels are black like during the live run of the game. It allowed me
to perform step-by-step debugging into the r600 Mesa code after I rebuilt it
from source with debugging options.

The TGSI program looks a bit different than when I output it with the
environment variable but I get the same error than with the original mesa
libraries released with Ubuntu.

What it looks like is that the temporary variables of the TGSI program are
nearly directly mapped to registers, but the rv770 "only" have 128 registers.
The TGSI program I dumped uses nearly 400 temporary variables. This might
explain the error.

Maybe some registers could be reused to keep below the limit? I've been
browsing a bit about this kind of problem and it seems to be a typical
computer-science compilation problem. A recurring solution I've read about is a
graph coloring algorithm. However I do not know where any of the register
allocation optimization should occur. In the r600 code or when the TGSI program
is generated so all GPU specific code could benefit of it? In any case it looks
like a tough problem.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #6 from MWATTT <megwattt@gmail.com> ---
This issue should be fixed on master.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #7 from Jim Spencer <tbt19901508@gmail.com> ---
I can produce a trace file without any issue. 
https://bit.ly/2CVHGCM

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

--- Comment #8 from Hadrien Nilsson <freedesktop@psydk.org> ---
Unfortunately I do not have a Radeon HD 4870 anymore so I have no way to retest
this bug.

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[Bug 93546] Civilization 5 - Leaders in the diplomatic interactions screen appear completely black

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https://bugs.freedesktop.org/show_bug.cgi?id=93546

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

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

--- Comment #9 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/567.

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