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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - glUniformSubroutinesuiv segfaults when subroutine uniform is bound to a specific location"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93731">93731</a>
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<th>Summary</th>
<td>glUniformSubroutinesuiv segfaults when subroutine uniform is bound to a specific location
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>11.0
</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>Mesa core
</td>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>nioko1337@googlemail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=121069" name="attach_121069" title="fragment shader to test segfault">attachment 121069</a> <a href="attachment.cgi?id=121069&action=edit" title="fragment shader to test segfault">[details]</a></span>
fragment shader to test segfault
In GLSL, one can specify the location of a subroutine uniform by using
something like:
#extension GL_ARB_shader_subroutine : require
#extension GL_ARB_explicit_uniform_location : require
layout(location = 5) subroutine uniform color_t Color;
Assuming this is the only subroutine uniform, you should be able to set it's
value by calling:
UniformSubroutinesuiv(GL_FRAGMENT_SHADER, 6, &[0, 0, 0, 0, 0 ,
subroutin_index]);
According to the spec, the values [0]-[4] should be ignored, and the subroutine
uniform at location 5 should be set to `subroutin_index`.
Mesa will segfault when calling this function like that.
Unfortunately, I do not have a complete minimum example program right now (I'm
not good with raw opengl), but attached is a fragment shader which can be used
to reproduce the problem.</pre>
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