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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW] Mishandling of sample count when using an attachment-less framebuffer (assertion error)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93957">93957</a>
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<th>Summary</th>
<td>[HSW] Mishandling of sample count when using an attachment-less framebuffer (assertion error)
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
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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>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>Drivers/DRI/i965
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<th>Assignee</th>
<td>idr@freedesktop.org
</td>
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<th>Reporter</th>
<td>imirkin@alum.mit.edu
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>This manifests in the dEQP test:
dEQP-GLES31.functional.fbo.no_attachments.multisample.samples2
gen6_multisample_state.c:150: gen6_emit_3dstate_multisample: Assertion
`!"Unrecognized num_samples in gen6_emit_3dstate_multisample"' failed.
(gdb) p brw->num_samples
$1 = 2
But of course the minimum number of samples handled is 4. You're allowed to
upgrade this in the driver, just like for glRenderbufferStorageMultisample. See
the ARB_framebuffer_no_attachments spec:
"""
The number of samples in the
framebuffer is derived from the value of FRAMEBUFFER_DEFAULT_SAMPLES in an
implementation-dependent manner similar to that described for the command
RenderbufferStorageMultisample (section 4.4.2).
"""</pre>
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