[Mesa-dev] [Bug 79783] Distorted output in obs-studio where other vendors "work"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79783

Kenneth Graunke <kenneth at whitecape.org> changed:

           What    |Removed                     |Added
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                 CC|                            |idr at freedesktop.org

--- Comment #1 from Kenneth Graunke <kenneth at whitecape.org> ---
apitrace dump-images shows that misrendering happens on the very first draw
call (#55762 in the trace).  The misrendering looks like a texture coordinate
problem: the correct image (in the upper right quadrant) is upside-down, and
the edge pixels are extended infinitely (due to GL_CLAMP_TO_EDGE).

INTEL_DEBUG=vs shows that the vertex shader outputs are being qualified as
"flat", even though the "flat" keyword never appears in the shader source code.

I believe this is a bug in our separate shader objects (SSO) implementation. 
I've observed that link_varyings.cpp:809 is kicking in, marking outputs as flat
because they aren't "being consumed by the fragment shader".  Indeed,
consumer_var is NULL in all cases.

CC'ing Ian.

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