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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - No pixel formats with WGL_SWAP_UNDEFINED_ARB && WGL_DOUBLE_BUFFER_ARB=true"
href="https://bugs.freedesktop.org/show_bug.cgi?id=100668">100668</a>
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<th>Summary</th>
<td>No pixel formats with WGL_SWAP_UNDEFINED_ARB && WGL_DOUBLE_BUFFER_ARB=true
</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>x86 (IA32)
</td>
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<th>OS</th>
<td>Windows (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</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>
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<th>Reporter</th>
<td>genpfault@gmail.com
</td>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
<div>
<pre>I'm using llvmpipe on Windows 7 x64, though LLVM & Mesa are built for 32-bit.
Requesting WGL_SWAP_UNDEFINED_ARB or WGL_SWAP_COPY_ARB in conjunction with
WGL_DOUBLE_BUFFER_ARB = TRUE results in wglChoosePixelFormatARB() returning
zero supported pixel formats.
These attributes work:
int pixel_attributes[] =
{
WGL_SUPPORT_OPENGL_ARB, TRUE,
WGL_DOUBLE_BUFFER_ARB, TRUE,
0
};
These do not:
int pixel_attributes[] =
{
WGL_SUPPORT_OPENGL_ARB, TRUE,
WGL_DOUBLE_BUFFER_ARB, TRUE,
WGL_SWAP_METHOD_ARB, WGL_SWAP_UNDEFINED_ARB,
0
};
This is causing ANGLE to fail to get a valid pixel format when using Mesa as
its OpenGL backend:
<a href="https://chromium.googlesource.com/angle/angle.git/+/master/src/libANGLE/renderer/gl/wgl/wgl_utils.cpp#35">https://chromium.googlesource.com/angle/angle.git/+/master/src/libANGLE/renderer/gl/wgl/wgl_utils.cpp#35</a></pre>
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