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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "invariant" qualifier on outputs of GLSL ES fragment shader causes compilation error."
href="https://bugs.freedesktop.org/show_bug.cgi?id=107842">107842</a>
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<th>Summary</th>
<td>"invariant" qualifier on outputs of GLSL ES fragment shader causes compilation error.
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<th>Product</th>
<td>Mesa
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<th>Version</th>
<td>git
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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
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<th>Severity</th>
<td>normal
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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>danylo.piliaiev@gmail.com
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<th>Reporter</th>
<td>danylo.piliaiev@gmail.com
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
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<pre>For example fragment shader containing:
invariant gl_FragColor;
Or:
invariant out highp vec4 test;
Causes similar error:
error: `gl_FragColor' cannot be marked invariant; interfaces between shader
stages only.
However in all GLSL ES specs there is no restriction on usage of "invariant"
with output variables in fragment shader.
From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 1.00 spec:
"Only the following variables may be declared as invariant:
...
- Built-in special variables output from the fragment shader."
From Section 4.6.1 ("The Invariant Qualifier") GLSL ES 3.00 spec:
"Only variables output from a shader can be candidates for invariance."</pre>
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