[Bug 107428] Flickering artifacts in OpenRA with Vega 56

[Bug 107428] Flickering artifacts in OpenRA with Vega 56

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107428

            Bug ID: 107428
           Summary: Flickering artifacts in OpenRA with Vega 56
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: isaaccurtis1@gmail.com

Created attachment 140898
  --> https://bugs.freedesktop.org/attachment.cgi?id=140898&action=edit
Capture of artifacts during menu screen.

System is Arch Linux running kernel 4.17.10 with Mesa 18.1.4.

glinfo line:
GL_VERSION: 3.1 Mesa 18.1.4
GL_RENDERER: Radeon RX Vega (VEGA10, DRM 3.25.0, 4.17.10-1-zen, LLVM 6.0.1)
GL_VENDOR: X.Org
GL_SHADING_LANGUAGE_VERSION = 1.40
GLU_VERSION: 1.3
GLU_EXTENSIONS: GLU_EXT_nurbs_tessellator GLU_EXT_object_space_tess 
GLUT_API_VERSION: 4
GLUT_XLIB_IMPLEMENTATION: 13

When opening the game a large number of blocky artifacts appear making fonts
unintelligible and the game unplayable. The artifacts are not static and move
around, much like static. 

OpenRA is an open source game engine. This is a new bug that has been isolated
to a particular commit:
https://github.com/OpenRA/OpenRA/commit/bfcbe8c0043bfadd1b38c4987f133e29aa54275c

However, this is the only GPU that currently displays this bug that has been
found.

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[Bug 107428] Flickering artifacts in OpenRA with Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107428

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |git
            Product|DRI                         |Mesa
         QA Contact|                            |dri-devel@lists.freedesktop
                   |                            |.org
          Component|DRM/AMDgpu                  |Drivers/Gallium/radeonsi

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Mesa seems more likely than the kernel for this.

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[Bug 107428] Flickering artifacts in OpenRA with Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107428

--- Comment #2 from Isaac Curtis <isaaccurtis1@gmail.com> ---
A second machine works just fine without the artifacts. Same kernel, same Mesa
version.

Glinfo:
GL_VERSION: 3.0 Mesa 18.1.4
GL_RENDERER: Mesa DRI Intel(R) Haswell Mobile 
GL_VENDOR: Intel Open Source Technology Center
GL_SHADING_LANGUAGE_VERSION = 1.30
GLU_VERSION: 1.3
GLU_EXTENSIONS: GLU_EXT_nurbs_tessellator GLU_EXT_object_space_tess 
GLUT_API_VERSION: 4
GLUT_XLIB_IMPLEMENTATION: 13

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[Bug 107428] Flickering artifacts in OpenRA with Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107428

--- Comment #3 from Isaac Curtis <isaaccurtis1@gmail.com> ---
Created attachment 140900
  --> https://bugs.freedesktop.org/attachment.cgi?id=140900&action=edit
video of artifacts

I captured a small video to show the nature of the artifacts.

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[Bug 107428] Flickering artifacts in OpenRA with Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107428

Isaac Curtis <isaaccurtis1@gmail.com> changed:

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

--- Comment #4 from Isaac Curtis <isaaccurtis1@gmail.com> ---
The bug has been identified. It can be seen on Lines 40-53 of
https://github.com/OpenRA/OpenRA/blob/bfcbe8c0043bfadd1b38c4987f133e29aa54275c/glsl/shp.frag

Basically, it was a floating point comparison bug. It checked for samplerIndex
a float that takes int values, against 1.0, 2.0, etc. However, sometimes 1 is
less than 1 due to floating point issues. Changing samplerIndex < 1.0 to
samplerIndex < 0.5 fixes the issue.

It turns out that AMDGPU drivers seem to be the only implementation that
experience this particular issue. 

This case is resolved. I don't see anything to fix in the drivers here.

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