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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [llvmpipe] Line antialiasing looks different when GL_LINE_STIPPLE is enabled with pattern 0xffff"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94193">94193</a>
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<th>Summary</th>
<td>[llvmpipe] Line antialiasing looks different when GL_LINE_STIPPLE is enabled with pattern 0xffff
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>10.6
</td>
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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
</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>Other
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>florianlink@gmail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=121810" name="attach_121810" title="the thicker line">attachment 121810</a> <a href="attachment.cgi?id=121810&action=edit" title="the thicker line">[details]</a></span>
the thicker line
When rendering lines with
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glLineWidth(3)
glEnable(GL_LINE_STIPPLE);
glLineStipple(1, 0xffff);
// draw line strip...
the lines look thicker and have uglier antialiasing as if rendered with:
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glLineWidth(3)
glDisable(GL_LINE_STIPPLE);
// draw line strip
When doing the same on NVidia or ATI OpenGL drivers, the lines look the
same.
Maybe it would make sense to detect the 0xffff pattern in MESA
and to not enable stippling when that pattern is set?</pre>
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