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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - No stencil buffer allocated when requested by GLUT"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101703">101703</a>
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<th>Summary</th>
<td>No stencil buffer allocated when requested by GLUT
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>17.0
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Other
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>o.lauffenburger@topsolid.com
</td>
</tr>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=132472" name="attach_132472" title="Alternative implementation of stw_pixelformat_choose">attachment 132472</a> <a href="attachment.cgi?id=132472&action=edit" title="Alternative implementation of stw_pixelformat_choose">[details]</a></span>
Alternative implementation of stw_pixelformat_choose
I create an OpenGL context with Mesa 17.0 Gallium + software rasterizer with
the following GLUT command:
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL)
Then no stencil buffer is allocated.
The problem is that the selection logic of ChoosePixelFormat() gives more
importance to the 32-bit color than to the 8-bit stencil.
I have changed the implementation of stw_pixelformat_choose() in
\src\gallium\state_trackers\wgl\stw_pixelformat.c to give the highest priority
to features requested but not available, then a lower priority to features with
less precision allocated than requested, then the lowest priority to features
with more precision allocated than requested.
My implementation is in the attached file.</pre>
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