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kms: Fix VRR check having already missed the deadline

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This commit is contained in:
Victoria Brekenfeld 2025-04-24 18:58:32 +02:00 • committed by Victoria Brekenfeld
parent db25cc4b0b
commit 8aaaa12d5c
2 changed files with 27 additions and 13 deletions
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14
src/backend/kms/surface/mod.rs
View file

@ -1008,14 +1008,12 @@ impl SurfaceThreadState {
.map_err(|err| {
anyhow::format_err!("Failed to accumulate elements for rendering: {:?}", err)
})?;
let additional_frame_flags = if vrr
&& has_active_fullscreen
&& !self.timings.past_min_presentation_time(&self.clock)
{
FrameFlags::SKIP_CURSOR_ONLY_UPDATES
} else {
FrameFlags::empty()
};
let additional_frame_flags =
if vrr && has_active_fullscreen && !self.timings.past_min_render_time(&self.clock) {
FrameFlags::SKIP_CURSOR_ONLY_UPDATES
} else {
FrameFlags::empty()
};
self.timings.set_vrr(vrr);
self.timings.elements_done(&self.clock);

26
src/backend/kms/surface/timings.rs
View file

@ -320,9 +320,9 @@ impl Timings {
}
}
pub fn past_min_presentation_time(&self, clock: &Clock<Monotonic>) -> bool {
pub fn past_min_render_time(&self, clock: &Clock<Monotonic>) -> bool {
let now: Duration = clock.now().into();
let Some(refresh_interval_ns) = self.min_refresh_interval_ns else {
let Some(min_refresh_interval_ns) = self.min_refresh_interval_ns else {
return true;
};
let Some(last_presentation_time): Option<Duration> = self
@ -333,13 +333,29 @@ impl Timings {
return true;
};
let refresh_interval_ns = refresh_interval_ns.get();
let min_refresh_interval_ns = min_refresh_interval_ns.get();
if now <= last_presentation_time {
return false;
}
let next = last_presentation_time + Duration::from_nanos(refresh_interval_ns);
now >= next
const MIN_MARGIN: Duration = Duration::from_millis(3);
let baseline = if let Some(refresh_interval_ns) = self.refresh_interval_ns {
MIN_MARGIN.max(Duration::from_nanos(refresh_interval_ns.get() / 2))
} else {
MIN_MARGIN
};
let next_presentation_time =
last_presentation_time + Duration::from_nanos(min_refresh_interval_ns);
let deadline = next_presentation_time.saturating_sub(
if let Some(avg_submittime) = self.avg_submittime(SAMPLE_TIME_WINDOW) {
avg_submittime
} else {
baseline
} + BASE_SAFETY_MARGIN,
);
now >= deadline
}
pub fn next_render_time(&self, clock: &Clock<Monotonic>) -> Duration {