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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Very slow performance when rendering scenes with transparency, probably caused by excessive copying (intel_miptree_map())"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101592#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Very slow performance when rendering scenes with transparency, probably caused by excessive copying (intel_miptree_map())"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101592">bug 101592</a>
from <span class="vcard"><a class="email" href="mailto:sdh4@iastate.edu" title="Steve Holland <sdh4@iastate.edu>"> <span class="fn">Steve Holland</span></a>
</span></b>
<pre>Application is dgscope, a newer, not yet published version of
<a href="http://thermal.cnde.iastate.edu/dataguzzler/download/dgscope-export-2.0.0-beta21.tar.gz">http://thermal.cnde.iastate.edu/dataguzzler/download/dgscope-export-2.0.0-beta21.tar.gz</a>
This cropped up when we discovered we had failed to set GLUT_ALPHA in
glutInitDisplayMode() (oops!). Other drivers had drawn transparency just fine
without GLUT_ALPHA, but this one was drawing everything as fully opaque.
The 10-100x slowdown is compared to previous version of dgscope (without
GLUT_ALPHA) running on 3-year old hardware under Fedora 25. Will get you more
clarity shortly.
Curiously, the slowdown doesn't seem to occur if the entire scene has 100%
opacity.</pre>
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