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loader/dri3: Always use at least two back buffers

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This can make a significant difference for performance with some extreme
test cases such as vblank_mode=0 glxgears.

Fixes: 1e3218bc5b ("loader/dri3: Overhaul dri3_update_num_back")
Cc: "12.0 11.2" <mesa-stable@lists.freedesktop.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97549
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
This commit is contained in:
Michel Dänzer 2016-09-06 11:34:49 +09:00 • committed by Michel Dänzer
parent d0cd504046
commit dc3bb5db8c
1 changed files with 1 additions and 3 deletions
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4
src/loader/loader_dri3_helper.c
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@ -70,10 +70,8 @@ dri3_update_num_back(struct loader_dri3_drawable *draw)
{
if (draw->flipping)
draw->num_back = 3;
else if (draw->vtable->get_swap_interval(draw) != 0)
draw->num_back = 2;
else
draw->num_back = 1;
draw->num_back = 2;
}
void