[Bug 71138] New: flashlight bug in L4D2

[Bug 71138] New: flashlight bug in L4D2

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

          Priority: medium
            Bug ID: 71138
          Assignee: dri-devel@lists.freedesktop.org
           Summary: flashlight bug in L4D2
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: yashax@windowslive.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

Created attachment 88506
  --> https://bugs.freedesktop.org/attachment.cgi?id=88506&action=edit
The black spots.

When I'm looking on my teammates with flashlight, there are black spots on
them. The black spots are moving very fast. It doesn't happens with
walls/zombies, only with teammates.

-------------------
System information:

Radeon HD 4850
Ubuntu 12.04.3
Linux 3.12-rc7
X.Org server version: 1.11.3
libdrm2 version: 2.4.47+git1310301030.45810d~gd~p
xserver-xorg-video-radeon version: 7.2.0+git1310021050.f1dc67~gd~p
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 3.0 Mesa 10.0.0-devel (git-b16b3c8 precise-oibaf-ppa)
OpenGL shading language version string: 1.30

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #1 from yashax@windowslive.com ---
Created attachment 88507
  --> https://bugs.freedesktop.org/attachment.cgi?id=88507&action=edit
Re-uploading the first screenshot.

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #2 from yashax@windowslive.com ---
Created attachment 88508
  --> https://bugs.freedesktop.org/attachment.cgi?id=88508&action=edit
Another screenshot showing the black spots.

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #88506|text/plain                  |image/png
          mime type|                            |

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #3 from Vadim Girlin <ptpzz@yandex.ru> ---
This looks like z-fighting issues. You might want to try disabling compiler
backends via R600_DEBUG environment variable:

R600_DEBUG=nollvm
R600_DEBUG=nosb
R600_DEBUG=nollvm,nosb

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #4 from yashax@windowslive.com ---
(In reply to comment #3)
> This looks like z-fighting issues. You might want to try disabling compiler
> backends via R600_DEBUG environment variable:
> 
> R600_DEBUG=nollvm
> R600_DEBUG=nosb
> R600_DEBUG=nollvm,nosb

The bug still exists with these environment variables.
The bug report and my last tests were done with shader detail setting on low.
I found that the bug happens with shader detail on low and medium, but on high
and very high the bug disappears.

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #5 from Benjamin Bellec <b.bellec@gmail.com> ---
I'm experiencing the same issue, with the same hardware.
I tried different graphics settings. The corruption exists only when the
"shader detail" ("Détails de l'image" in french) is set to "low" or "mid". When
set on "high" or "very high", there is no problem. All other settings doesn't
change anything.

Note that when the character is in the sunlight, then the flashlight have less
incidence (less blinking textures).

Here is a video showing the bug (199.6 MiB):
http://ubuntuone.com/12CfgEkAOwaBvgXKQILIxR

I have also a Radeon HD 5870 (AMD CYPRESS), and there is no such problem with
this card (same software config).

-------------------
System information:

Radeon HD 4850 (RV770)
Fedora 19 x86-64
Linux 3.11.9-200.fc19.x86_64
libdrm 2.4.49-1.i686
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL core profile version string: 3.1 (Core Profile) Mesa 10.1.0-devel
(git-5455c81)
OpenGL core profile shading language version string: 1.40

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #6 from Benjamin Bellec <b.bellec@gmail.com> ---
It seems that nv50 (GT218) has the same issue.

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #7 from Benjamin Bellec <b.bellec@gmail.com> ---
Disabling Hyper-Z with R600_DEBUG=nohyperz doesn't fix the bug (tested on RV770
and current master).

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #8 from Benjamin Bellec <b.bellec@gmail.com> ---
I tested with an old Mesa release (9.0 from the spot.fedorapeople.org/steam
repo) on Fedora 17, and the problem is already here.

It would be nice if somebody can test with the proprietary driver and with
intel driver.

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

--- Comment #9 from yashax@windowslive.com ---
It looks like this bug is fixed with current mesa master. Can you please verify
that on your hardware?

-------------------
System information:
Radeon HD 4850
Ubuntu 13.10 x86_64
Linux 3.14
libdrm 2.4.53+git1404110630.504d60
xserver-xorg-video-radeon 7.3.99+git1404022026.ed0cfb
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.2.0-devel
(git-55f9bbd saucy-oibaf-ppa)
OpenGL core profile shading language version string: 3.30

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[Bug 71138] flashlight bug in L4D2

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https://bugs.freedesktop.org/show_bug.cgi?id=71138

Benjamin Bellec <b.bellec@gmail.com> changed:

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

--- Comment #10 from Benjamin Bellec <b.bellec@gmail.com> ---
Yes I confirm this is now fixed.
I can even add the fix was:

commit: e9822f77a9cc024f528d30382fd5ad21c73a173b
title: glsl: Skip making a temporary for assignments when we don't need one.
author: Eric Anholt <eric@anholt.net>
date: 2014-04-08 07:59:47 (GMT)

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