Tom Stellard wrote:
Hi,
I have just published a branch with loop emulation for the r300
compiler here: http://cgit.freedesktop.org/~tstellar/mesa/
This adds support for unrolling of loops that have a constant number of
iterations (e.g. for(i=0; i<10; i++) or for(i=10; i>0; i--)
It only handles cases where the counter is either added to or subtracted
from, like the examples above, but I think this covers a majority
of loops.
Loops that have an unknown number of iterations are unrolled as many
times as possible without going over the instruction limit for the
shader program.
Right now, this is only enabled for fragment shaders, but I am working on
enabling it for vertex shaders.
Any comments/suggestions would be appreciated. Thanks.
Is there any advantage to doing this in the r300 compiler instead of
the GLSL compiler? The GLSL compiler already does loop unrolling in
some cases. If we do it in the GLSL compiler, all the drivers can
benefit.
-Brian
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