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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Invalid gl_InstanceID value with combination of gl_DrawIDARB under OpenGL"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106411">106411</a>
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<th>Summary</th>
<td>Invalid gl_InstanceID value with combination of gl_DrawIDARB under OpenGL
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>18.0
</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>glsl-compiler
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>frustumo@gmail.com
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<pre>Created <span class=""><a href="attachment.cgi?id=139374" name="attach_139374" title="app">attachment 139374</a> <a href="attachment.cgi?id=139374&action=edit" title="app">[details]</a></span>
app
The value of gl_InstanceID variable is incorrect when shader has gl_DrawIDARB.
Inserting additional dependency on gl_VertexID or gl_BaseInstanceARB variable
restores gl_InstanceID value.
Uncomment 17 line inside main_vertex.glsl file to fix gl_InstanceID:
// position.x += gl_VertexID * 1e-6f;
There is no such problem under Vulkan API.
Mesa DRI Intel(R) Iris Pro Graphics 580 (Skylake GT4e)
4.5 (Core Profile) Mesa 18.0.0-rc4</pre>
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