<html>
<head>
<base href="https://bugs.freedesktop.org/">
</head>
<body><span class="vcard"><a class="email" href="mailto:z.figura12@gmail.com" title="Zebediah Figura <z.figura12@gmail.com>"> <span class="fn">Zebediah Figura</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - triangle clipping causes wrong vertex's attribute to be broadcasted for flat interpolation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98846">bug 98846</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>z.figura12@gmail.com
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - triangle clipping causes wrong vertex's attribute to be broadcasted for flat interpolation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98846#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - triangle clipping causes wrong vertex's attribute to be broadcasted for flat interpolation"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98846">bug 98846</a>
from <span class="vcard"><a class="email" href="mailto:z.figura12@gmail.com" title="Zebediah Figura <z.figura12@gmail.com>"> <span class="fn">Zebediah Figura</span></a>
</span></b>
<pre>This also affects softpipe and llvmpipe. I'm not familiar with mesa, but I
think there are multiple places that do the wrong thing. For example,
do_clip_tri() in src/gallium/auxiliary/draw/draw_pipe_clip.c gets passed the
vertices in winding order, but it doesn't take that into account when
determining provoking vertex.
If this should be split off to a separate bug, then I'll do so.
This causes failures in Wine's conformance test suite, since we use
GL_FIRST_VERTEX_CONVENTION universally, and test flat shading with
GL_TRIANGLESTRIP and some vertices slightly clipped outside of the viewport.
Since our test suite is run in a virtual machine, it uses llvmpipe, and so is
affected by this bug.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are the QA Contact for the bug.</li>
<li>You are the assignee for the bug.</li>
</ul>
</body>
</html>