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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 - GL_DEPTH_CLAMP doesn't clamp to the far plane"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97231">97231</a>
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<th>Summary</th>
<td>GL_DEPTH_CLAMP doesn't clamp to the far plane
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>unspecified
</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>major
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Mesa core
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>jules.blok@gmail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<pre>Created <span class=""><a href="attachment.cgi?id=125579" name="attach_125579" title="apitrace file to reproduce the problem">attachment 125579</a> <a href="attachment.cgi?id=125579&action=edit" title="apitrace file to reproduce the problem">[details]</a></span>
apitrace file to reproduce the problem
On both the Intel drivers and the software rasterizer (llvm) GL_DEPTH_CLAMP
doesn't properly clamp to the far plane as specified. It seems that it clamps
the depth value written to the depth buffer to 1.0 instead.
According to the specs:
<a href="https://www.opengl.org/registry/specs/ARB/depth_clamp.txt">https://www.opengl.org/registry/specs/ARB/depth_clamp.txt</a>
The one major issue is that fragments of a primitive may extend
beyond the conventional window space depth range for depth values
(typically the range [0,1]). Rather than discarding fragments that
defy the window space depth range (effectively what near and far
plane clipping accomplish), the depth values can be clamped to the
current depth range.
I've attached an apitrace to reproduce the problem.
Expected output:
<a href="https://fifoci.dolphin-emu.org/media/results/a09836d8de0911b9c6bdceffe64561a54cd988e9.png">https://fifoci.dolphin-emu.org/media/results/a09836d8de0911b9c6bdceffe64561a54cd988e9.png</a>
Actual output:
<a href="https://fifoci.dolphin-emu.org/media/results/565273f42d550e19b9b83921f177e4a898bbd5e6.png">https://fifoci.dolphin-emu.org/media/results/565273f42d550e19b9b83921f177e4a898bbd5e6.png</a></pre>
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