https://bugs.freedesktop.org/show_bug.cgi?id=111241
--- Comment #11 from Pierre-Eric Pelloux-Prayer pierre-eric.pelloux-prayer@amd.com --- (In reply to Dieter Nützel from comment #8)
BTW
Pierre-Eric can you look into this
Shadertoy shader corruption, too? https://www.shadertoy.com/view/Xt3cWS
The "Buffer A" shader doesn't write fragColor when uv.y is < 0.1 or > 0.9.
So the content is undefined and may be black on some platform or random.
radeonsi is correct here, but we might want to replace undef values with 0x0 to get a default value instead of random.