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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 - Register spilling with gl_VertexID"
href="https://bugs.freedesktop.org/show_bug.cgi?id=84758">84758</a>
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<th>Summary</th>
<td>Register spilling with gl_VertexID
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
</tr>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
</tr>
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<th>Assignee</th>
<td>idr@freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>eero.t.tamminen@intel.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>petri.latvala@intel.com
</td>
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<th>Blocks</th>
<td>77547
</td>
</tr></table>
<p>
<div>
<pre>HS/SW setup:
- HSW GT3e
- Mesa git from 2014-09-30
- Ubuntu 14.04
Test-case:
- Build ogl-samples test-suite from:
<a href="https://github.com/g-truc/ogl-samples.git">https://github.com/g-truc/ogl-samples.git</a>
- Run following test:
build/Release/gl-400-fbo-rtt-texture-array
Actual result:
- "Vertex shader triggered register spilling. Try reducing number of live vec4
value to improve performance."
Expected result:
- No register spilling with this simple vertex shader
Vertex shader is this:
<a href="https://github.com/g-truc/ogl-samples/blob/master/data/gl-400/rtt-array.vert">https://github.com/g-truc/ogl-samples/blob/master/data/gl-400/rtt-array.vert</a>
Code for the test is here:
<a href="https://github.com/g-truc/ogl-samples/blob/master/tests/gl-400-fbo-rtt-texture-array.cpp">https://github.com/g-truc/ogl-samples/blob/master/tests/gl-400-fbo-rtt-texture-array.cpp</a>
Same thing happens also with the other tests using gl_VertexID as array index
to small const array, for example with gl-320-draw-without-vertex-attrib test:
<a href="https://github.com/g-truc/ogl-samples/blob/master/data/gl-320/draw-without-vertex-attrib.vert">https://github.com/g-truc/ogl-samples/blob/master/data/gl-320/draw-without-vertex-attrib.vert</a>
(which doesn't require setting these like gl-400-fbo-rtt* tests do:
MESA_GL_VERSION_OVERRIDE=4.00
MESA_GLSL_VERSION_OVERRIDE=400
)</pre>
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