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

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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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