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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - glGetFramebufferAttachmentParameteriv() returns GL_INVALID_ENUM when getting attachment size from back buffer"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100609">100609</a>
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<th>Summary</th>
<td>glGetFramebufferAttachmentParameteriv() returns GL_INVALID_ENUM when getting attachment size from back buffer
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>17.0
</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
</td>
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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>
</tr>
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<th>Reporter</th>
<td>nfxjfg@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre>I'm doing this to determine the default framebuffer depth in "generic" GL code
that can't access GLX or EGL:
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_BACK_LEFT,
GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE, &depth_g);
This would be in OpenGL 3 (not sure which versions exactly, probably 3.0 and
3.3 at least).
Mesa causes a GL_INVALID_ENUM error, while nVidia binary drivers accept this
and return the expected value.
The GL 3 spec is not entirely clear on this, but there seems to be nothing that
disallows using glGetFramebufferAttachmentParameteriv() like this. Some other
GL implementations also seem to support it. So I would tend towards considering
this a Mesa bug, but of course I'm not sure.
I think this has been happening at least with Mesa 11, up to at least 17.0.2.
The above snippet is simplified from:
<a href="https://github.com/mpv-player/mpv/blob/master/video/out/opengl/utils.c#L1282">https://github.com/mpv-player/mpv/blob/master/video/out/opengl/utils.c#L1282</a>
mpv itself might serve as use-case, although current releases use an older
version of this code.</pre>
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