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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - intelReadPixels: fallback to CPU mapping in PBO case for Z24S8 attachments"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106800">106800</a>
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<th>Summary</th>
<td>intelReadPixels: fallback to CPU mapping in PBO case for Z24S8 attachments
</td>
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
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<th>OS</th>
<td>Linux (All)
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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
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>wickmarkus@web.de
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=139997" name="attach_139997" title="Apitrace dump of citra showing the performance issue">attachment 139997</a> <a href="attachment.cgi?id=139997&action=edit" title="Apitrace dump of citra showing the performance issue">[details]</a></span>
Apitrace dump of citra showing the performance issue
Hi,
calling glReadPixels for the GL_DEPTH24_STENCIL8 attachment and the
GL_DEPTH_STENCIL / GL_UNSIGNED_INT_24_8 format seems to stall the GPU, even if
a PBO is bound. 92% of my CPU time is spend in intel_miptree_map.
I guess i965 lacks a copy shader for the tiled Z24S8 attachment to the linear
TBO buffer.
Tests was done on: Mesa DRI Intel(R) UHD Graphics 620 (Kabylake GT2)
and mesa: 4affeba1e9eb426a1ba13a3e8ced4673c4bb9b34
An apitrace dump which highlights this issue in the last frames is attached.</pre>
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