[Bug 89909] Cities: Skylines black rooftops

[Bug 89909] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

            Bug ID: 89909
           Summary: Cities: Skylines black rooftops
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Keywords: bisected
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: john@fastquake.com
        QA Contact: dri-devel@lists.freedesktop.org

Here's a screenshot of the bug:

http://i.imgur.com/DLp1dFr.png

I'm running an AMD R9 290 on Linux Mint 17.1, with kernel 4.0-rc5. I have
bisected mesa commits and found commit f9fd0c4a55afd97fd34d0e846000c75f5f6ecac2
(http://cgit.freedesktop.org/mesa/mesa/commit/?id=f9fd0c4a55afd97fd34d0e846000c75f5f6ecac2)
to be the culprit. Mesa was compiled with llvm 3.6 from the Ubuntu
repositories.

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

John Brooks <john@fastquake.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Cities: Skylines black      |[radeonsi][bisected]
                   |rooftops                    |Cities: Skylines black
                   |                            |rooftops

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |maraeo@gmail.com,
                   |                            |tstellar@gmail.com

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Marek/Tom, any ideas?

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

--- Comment #2 from Marek Olšák <maraeo@gmail.com> ---
Sqrt(x) results are undefined if x < 0, so the only thing we are allowed to do
is sqrt(abs(x)). That is how RSQ works.

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

--- Comment #3 from Tom Stellard <tstellar@gmail.com> ---
Can you run the program with the environment variables:

MESA_GLSL=dump PIGLIT_PLATFORM=gbm R600_DEBUG=ps,vs,gs


And post the output.

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

--- Comment #4 from Marek Olšák <maraeo@gmail.com> ---
Can you still reproduce this with current Mesa git?

Anyway, this is a game bug. The game generates NaNs, which produces the
artifacts. The game might have been designed for DX9 or GL2 hardware, not GL3.

It shouldn't occur anymore, because NaNs are disabled by radeonsi.

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[Bug 89909] [radeonsi][bisected] Cities: Skylines black rooftops

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https://bugs.freedesktop.org/show_bug.cgi?id=89909

John Brooks <john@fastquake.com> changed:

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

--- Comment #5 from John Brooks <john@fastquake.com> ---
No longer seems to be happening as of 11.0.3
(914966befcd57764941405707d8f57d3e7e7f768)

Thank you to the development team.

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