[Bug 97852] Unreal Engine corrupted preview viewport

[Bug 97852] Unreal Engine corrupted preview viewport

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

            Bug ID: 97852
           Summary: Unreal Engine corrupted preview viewport
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mw@graph-ix.net
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 126603
  --> https://bugs.freedesktop.org/attachment.cgi?id=126603&action=edit
Viewport corruption

Unreal Engine 4.13.1 editor shows corrupted preview viewports when at least one
of the following post-processing effects is active in a viewport:
* Motion Blur
* Tonemapper

A screenshot of a viewport segment is attached.

When both effects are turned off, viewports appear to render correctly.


Graphics card: AMD TONGA chipset (Radeo R9 380)
Mesa version: 12.1~git1600917222200.073129c~x~padoka0 on Ubuntu 16.04 with
Padoka PPA
glxinfo:
  OpenGL core profile version string: 4.3 (Core Profile) Mesa 12.1.0-devel -
padoka PPA
  OpenGL version string: 3.0 Mesa 12.1.0-devel - padoka PPA
  OpenGL ES profile version string: OpenGL ES 3.1 Mesa 12.1.0-devel - padoka
PPA

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

--- Comment #1 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Hi Markus, can you provide an apitrace that can reproduce the corruption?

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

--- Comment #2 from Markus <mw@graph-ix.net> ---
(In reply to Nicolai Hähnle from comment #1)
> Hi Markus, can you provide an apitrace that can reproduce the corruption?
Hi Nicolai, I'm not familiar with debugging Mesa. Could you please provide a
link to documentation on how I can obtain the information you need?

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

--- Comment #3 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Use this tool: https://github.com/apitrace/apitrace to record a session that
shows the problem. Once installed, you basically just run `apitrace trace
<program under trace>`. The documentation linked to in the readme is generally
pretty good.

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

--- Comment #4 from Markus <mw@graph-ix.net> ---
Created attachment 127627
  --> https://bugs.freedesktop.org/attachment.cgi?id=127627&action=edit
API trace

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

--- Comment #5 from Markus <mw@graph-ix.net> ---
(In reply to Nicolai Hähnle from comment #3)
> Use this tool: https://github.com/apitrace/apitrace to record a session that
> shows the problem. Once installed, you basically just run `apitrace trace
> <program under trace>`. The documentation linked to in the readme is
> generally pretty good.

Hi Nicolai, an API trace is now attached. The trace was created with Mesa
version 13.1~git161022230600.7b7eb71~x~padoka0 where the issue is still
present.

The major part of the trace probably consists of the editor starting up, so the
issue itself should only be captured in the seconds prior to the editor
starting to shut down.

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[Bug 97852] Unreal Engine corrupted preview viewport

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https://bugs.freedesktop.org/show_bug.cgi?id=97852

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         QA Contact|dri-devel@lists.freedesktop |intel-3d-bugs@lists.freedes
                   |.org                        |ktop.org
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org
          Component|Drivers/Gallium/radeonsi    |glsl-compiler

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
A shader program fails to link, see below. This may be an Unreal Engine
(editor) bug, reassigning to the GLSL compiler for now.

839119 @4 glLinkProgram(program = 3018)
839119: warning: link failed
839119: warning: error: vertex shader output `out_TEXCOORD0' specifies
noperspective interpolation qualifier, but fragment shader input specifies no
interpolation qualifier

Mesa: User error: GL_INVALID_OPERATION in glUseProgram(program 3018 not linked)
[more errors]

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