[Nouveau] [Bug 66642] [nva5] Wrong provoking vertex is selected for flat attribute interpolation (clipping?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66642

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 84289
  --> https://bugs.freedesktop.org/attachment.cgi?id=84289&action=edit
pushbuf dump of
generated_tests/spec/glsl-1.30/execution/interpolation/interpolation-flat-gl_BackColor-smooth-none.shader_test

calim and I looked at this briefly, he couldn't figure out the issue. (And I
know nowhere close to enough about it to even try.)

Some observations:

(a) I see the same problem on NV96.
(b) All the interpolation-flat-gl_*BackColor-smooth-* tests fail, the
FrontColor ones succeed.

Attached is a pushbuf dump of the program. Would be good to see what the blob
does on the same test.

"""
<calim> so, if you want to fix it completely you have to add shader variants,
if you just want to fix it partially you have to set SHADE_MODEL depending on
the shader instead of just the rasterizer state, or you ignore it because it's
an insignificant corner case no one cares about
<calim> ah yes, or you see if the blob knows a cheat around it
<calim> it would be good to know if it actually sets SHADE_MODEL to flat in
that test
"""

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