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<th>Priority</th>
<td>medium
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<th>Bug ID</th>
<td><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">66642</a>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
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<th>Summary</th>
<td>[nva5] Wrong provoking vertex is selected for flat attribute interpolation (clipping?)
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Reporter</th>
<td>alzeih@gmail.com
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>git
</td>
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<th>Component</th>
<td>Drivers/DRI/nouveau
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<th>Product</th>
<td>Mesa
</td>
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<pre>The following piglit test:
interpolation-flat-gl_BackColor-smooth-none.shader_test
appears to select the wrong provoking vertex depending on the exact value of
v[0].y.
For v[0].y > -1.0, the triangle ends up red.
For v[0].y = -1.0, the triangle ends up green.
For v[0].y < -1.0, the triangle ends up (correctly) blue.
Hardware: nva5 (GT330M) in MacBookPro6,2
Mesa version: 1415a1884c
Kernel: 3.9.8-1-ARCH
Suspect the clipper doesn't respect the index of the provoking vertex in the
triangle?</pre>
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