From 6c649bab537f75ebf4def87be2a59c860bcc6859 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Sat, 16 Nov 2019 22:15:33 +0100
Subject: output: add wlr_output_event_present.commit_seq
This is set to the value of wlr_output.commit_seq when the frame has
been submitted. This allows tracking presentation with more then 1 full
frame of latency.
References: https://github.com/swaywm/wlroots/issues/1917
---
backend/drm/drm.c | 3 +++
1 file changed, 3 insertions(+)
(limited to 'backend')
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 9bcafeb6..fc6834ff 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -1497,6 +1497,9 @@ static void page_flip_handler(int fd, unsigned seq,
.tv_nsec = tv_usec * 1000,
};
struct wlr_output_event_present present_event = {
+ /* The DRM backend guarantees that the presentation event will be for
+ * the last submitted frame. */
+ .commit_seq = conn->output.commit_seq,
.when = &present_time,
.seq = seq,
.refresh = mhz_to_nsec(conn->output.refresh),
--
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