[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 #3 from Steve Holland <sdh4 at iastate.edu> ---
Comparison system running exactly the same application, but running Fedora 25
mesa-dri-drivers-13.0.4-3.fc25 and older Intel graphics "Haswell-ULT Integrated
Graphics Controller (rev 0b)" is a bit sluggish (say ~3 fps) at a particular
rendering operation (transparent text over transparent image). Newer system
(Mesa 17.1.3, Kaby Lake HD Graphics 620, Fedora 26 beta) on the same operation
is 0.3 fps. 

Same operations with software rendering forced (by LIBGL_ALWAYS_SOFTWARE=1) are
10+fps on both platforms

Just rendering the image is fast in all cases, transparent or not. Overlaying
the text character-by-character with glutBitmapCharacter() seems to be what is
slowing things down.

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