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wayland: don't use presentation time if ust is 0 

Testing kwinft out (kwin fork), it was discovered that sometimes it
would return a ust value of 0 which subsequently resulted in incorrect
presentation statistics (i.e. large negative numbers which are obviously
impossible). Arguably, it shouldn't return 0s, but a workaround for mpv
in this case is harmless.
This commit is contained in:
Dudemanguy 2020-10-19 11:00:15 -05:00
parent cbbdb3fae4
commit 9976c83e0f
1 changed files with 4 additions and 3 deletions
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7
video/out/wayland_common.c
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@ -1663,10 +1663,11 @@ void wayland_sync_swap(struct vo_wayland_state *wl)
int index = wl->sync_size - 1;
// If these are the same, presentation feedback has not been received.
// This can happen if a frame takes too long and misses vblank. Don't
// attempt to use these statistics and wait until the next presentation
// This can happen if a frame takes too long and misses vblank.
// Additionally, a compositor may return an ust value of 0. In either case,
// Don't attempt to use these statistics and wait until the next presentation
// event arrives.
if (wl->sync[index].ust == wl->last_ust) {
if (!wl->sync[index].ust || wl->sync[index].ust == wl->last_ust) {
wl->last_skipped_vsyncs = -1;
wl->vsync_duration = -1;
wl->last_queue_display_time = -1;