[Bug 101592] Very slow performance when rendering scenes with transparency, probably caused by excessive copying (intel_miptree_map())

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101592

--- Comment #2 from Steve Holland <sdh4 at iastate.edu> ---
Application is dgscope, a newer, not yet published version of
http://thermal.cnde.iastate.edu/dataguzzler/download/dgscope-export-2.0.0-beta21.tar.gz

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.

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