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<body><span class="vcard"><a class="email" href="mailto:stereotype441@gmail.com" title="Paul Berry <stereotype441@gmail.com>"> <span class="fn">Paul Berry</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601">bug 70601</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;">Status</td>
<td>ASSIGNED
</td>
<td>RESOLVED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70601">bug 70601</a>
from <span class="vcard"><a class="email" href="mailto:stereotype441@gmail.com" title="Paul Berry <stereotype441@gmail.com>"> <span class="fn">Paul Berry</span></a>
</span></b>
<pre>Fixed by commit c4cf487315f1f5375534f1677177983fa496d577
Author: Paul Berry <<a href="mailto:stereotype441@gmail.com">stereotype441@gmail.com</a>>
Date: Wed Nov 27 07:43:03 2013 -0800
i965/gen6: Fix multisample resolve blits for luminance/intensity 32F
formats
On gen6, multisamble resolve blits use the SAMPLE message to blend
together the 4 samples for each texel. For some reason, SAMPLE
doesn't blend together the proper samples when the source format is
L32_FLOAT or I32_FLOAT, resulting in blocky artifacts.
To work around this problem, sample from the source surface using
R32_FLOAT. This shouldn't affect rendering correctness, because when
doing these resolve blits, the destination format is R32_FLOAT, so the
channel replication done by L32_FLOAT and I32_FLOAT is unnecessary.
Fixes piglit tests on Sandy Bridge:
- spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float
- spec/ARB_texture_float/multisample-formats 4 GL_ARB_texture_float
No piglit regressions on Sandy Bridge.
Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB Bisected]Piglit spec/ARB_texture_float/multisample-formats 2 GL_ARB_texture_float fails"
href="show_bug.cgi?id=70601">https://bugs.freedesktop.org/show_bug.cgi?id=70601</a>
Cc: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>>
Cc: <a href="mailto:mesa-stable@lists.freedesktop.org">mesa-stable@lists.freedesktop.org</a>
Reviewed-by: Kenneth Graunke <<a href="mailto:kenneth@whitecape.org">kenneth@whitecape.org</a>></pre>
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