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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Can't set int attributes to certain values on 32-bit"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82668">82668</a>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>Can't set int attributes to certain values on 32-bit
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>neil@linux.intel.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Mesa core
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
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<pre>On 32-bit builds you can't set int attributes using glUniformI* to certain
values if they happen to look like a signalling NaN number when interpreted as
a float. This is similar to <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [SNB]Piglit spec_arb_shading_language_packing_execution_built-in-functions_fs-packSnorm4x8 fails"
href="show_bug.cgi?id=81150">bug 81150</a> except that it is not limited to the i965
driver.
The problem is that the attribute values are always stored in float variables
even if they are actually integers. The values are converted to float using
INT_AS_FLT and UINT_AS_FLT. I think the best thing to do would be to get rid of
these functions and have FLT_AS_UINT instead. Then we can change all of the
variables to store the values in GLuints instead of floats.</pre>
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