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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Increased difference from reference image in shaders"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103616">103616</a>
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<th>Summary</th>
<td>Increased difference from reference image in shaders
</td>
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>17.2
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>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>b7.10110111@gmail.com
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</tr>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>After commit 4009a9ead490ef1718e6fa83141aa086a43cd901 (found by git-bisect,
double-checked by git-revert) I get two failures of the integration_test in
precomputed_atmospheric_scattering demo [1]. The tests there compare reference
CPU-generated image with the one generated with GLSL code, checking that PSNR
is high enough. Before the above commit they all passed. Now the tests failing
are:
47 is not less than 46.7812
[ FAIL ] ModelTest RadianceSeparateTextures
46 is not less than 45.6379
[ FAIL ] ModelTest RadianceCombineTextures
I tested on Xeon E3-1226 v3 built-in GPU, as well as on Core i7-4765T built-in
GPU, with the exact same results.
I'm not sure if this is an expected decrease in precision, but it seems strange
to me: from the commit message I get that the code transformation introduced
should be equivalent. Apparently it's not, or there may be a bug somewhere.
[1]: <a href="https://github.com/ebruneton/precomputed_atmospheric_scattering">https://github.com/ebruneton/precomputed_atmospheric_scattering</a></pre>
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