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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - EGL application crashes with BadDrawable at SwapBuffers"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75797">75797</a>
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>EGL application crashes with BadDrawable at SwapBuffers
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>scampa.giovanni@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>EGL
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=95167" name="attach_95167" title="Test case">attachment 95167</a> <a href="attachment.cgi?id=95167&action=edit" title="Test case">[details]</a></span>
Test case
If you create two X windows, make one EGL context current to the first one and
then to the second one, then clear and swap the second one, you will get an X
error at swap buffers time.
After debugging, I found that the glClear is optimized away because the
gl_framebuffer has Width and Height == 0, despite the glViewport call that
invalidated the drawable. Thus intel_prepare_render() is never reached (the
viewport is already initialized in the second MakeCurrent call) and we never
query X for the DRI2 buffers for the second window.
X logs include
[107772.804] (EE) intel(0): [DRI2] DRI2SwapBuffers: drawable has no back or
front?
Test case attached. This is 100% reproducible here.
Mesa is befbda56a246f77797bdf13fc005353441db2879, from Feb 22, master branch.
Driver is i965 DRI, on a GM45 card.</pre>
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