[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107864

            Bug ID: 107864
           Summary: Specific Shadertoy demo renders garbage in empty parts
                    of target surface
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: kode54@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

The following Shadertoy demo:

https://www.shadertoy.com/view/Xt3cWS

renders garbage in the top and bottom strips of the target surface, which
appears to be uninitialized VRAM being copied to the display surface.

It does not appear to matter which WebGL capable browser I use to run the demo,
they all replicate the issue on my RX480.

I cannot get apitrace to run on Firefox without that particular page crashing
on load, and I cannot get RenderDoc to attach to the tab's process and actually
capture anything.

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[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107864

Christopher Snowhill <kode54@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|Other                       |x86-64 (AMD64)
                 OS|All                         |Linux (All)

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[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

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https://bugs.freedesktop.org/show_bug.cgi?id=107864

--- Comment #1 from Ilia Mirkin <imirkin@alum.mit.edu> ---
Adding

 else {
        fragColor = vec4(0);   
 }

at the bottom of mainImage appears to "fix" it. fragColor is otherwise ending
up with random values (effectively whatever happened to be in the registers,
probably left over from the division check).

I don't think this is a bug in mesa.

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[Bug 107864] Specific Shadertoy demo renders garbage in empty parts of target surface

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https://bugs.freedesktop.org/show_bug.cgi?id=107864

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

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

--- Comment #2 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/1327.

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