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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [nva5] Wrong provoking vertex is selected for flat attribute interpolation (clipping?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=66642#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [nva5] Wrong provoking vertex is selected for flat attribute interpolation (clipping?)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=66642">bug 66642</a>
from <span class="vcard"><a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> <span class="fn">Ilia Mirkin</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=84289" name="attach_84289" title="pushbuf dump of generated_tests/spec/glsl-1.30/execution/interpolation/interpolation-flat-gl_BackColor-smooth-none.shader_test">attachment 84289</a> <a href="attachment.cgi?id=84289&action=edit" title="pushbuf dump of generated_tests/spec/glsl-1.30/execution/interpolation/interpolation-flat-gl_BackColor-smooth-none.shader_test">[details]</a></span>
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
"""</pre>
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