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loader/dri3: Keep current number of back buffers if frame was skipped

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We'd previously take the copy path. If we were actually flipping (in
which case skipped frames are more likely to occur), we'd ping-pong
between a smaller and larger number of back buffers, and frame-rate
could vary / take a dip due to the buffer management overhead.

While I'm not sure this is actually possible to hit at this point, it
definitely will be with the next change.

Cc: mesa-stable
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7033>
This commit is contained in:
Michel Dänzer 2020-10-06 17:52:08 +02:00 • committed by Marge Bot
parent 60585fc4e3
commit 16a7cc4d44
1 changed files with 3 additions and 0 deletions
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3
src/loader/loader_dri3_helper.c
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@ -280,6 +280,9 @@ dri3_update_max_num_back(struct loader_dri3_drawable *draw)
draw->max_num_back = 3;
break;
case XCB_PRESENT_COMPLETE_MODE_SKIP:
break;
default:
/* On transition from flips to copies, start with a single buffer again,
* a second one will be allocated if needed