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output-schedule: refactor change tracking

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This commit is contained in:
Julian Orth 2024-10-29 08:47:49 +01:00
parent 7e40e90c4d
commit 435b0a49da
1 changed files with 36 additions and 21 deletions
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57
src/output_schedule.rs
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@ -15,6 +15,17 @@ use {
std::{cell::Cell, rc::Rc},
};
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
enum Change {
/// The backend has applied the latest changes.
None,
/// There are changes that the backend is not yet aware of.
Scheduled,
/// The backend is aware that there are changes and will apply them as part of the
/// next latch event.
AwaitingLatch,
}
pub struct OutputSchedule {
changed: AsyncEvent,
run: Cell<bool>,
@ -32,9 +43,8 @@ pub struct OutputSchedule {
vrr_enabled: Cell<bool>,
present_scheduled: Cell<bool>,
needs_hardware_cursor_commit: Cell<bool>,
needs_software_cursor_damage: Cell<bool>,
hardware_cursor_change: Cell<Change>,
software_cursor_change: Cell<Change>,
iteration: NumCell<u64>,
}
@ -53,9 +63,8 @@ impl OutputSchedule {
ring: ring.clone(),
eng: eng.clone(),
vrr_enabled: Default::default(),
present_scheduled: Cell::new(true),
needs_hardware_cursor_commit: Default::default(),
needs_software_cursor_damage: Default::default(),
hardware_cursor_change: Cell::new(Change::None),
software_cursor_change: Cell::new(Change::None),
hardware_cursor: Default::default(),
persistent: persistent.clone(),
last_present_nsec: Default::default(),
@ -79,9 +88,9 @@ impl OutputSchedule {
fn trigger(&self) {
let trigger = self.vrr_enabled.get()
&& !self.present_scheduled.get()
&& self.cursor_delta_nsec.is_some()
&& (self.needs_software_cursor_damage.get() || self.needs_hardware_cursor_commit.get());
&& (self.software_cursor_change.get() == Change::Scheduled
|| self.hardware_cursor_change.get() == Change::Scheduled);
if trigger {
self.run.set(true);
self.changed.trigger();
@ -90,7 +99,12 @@ impl OutputSchedule {
pub fn latched(&self) {
self.last_present_nsec.set(self.eng.now().nsec());
self.present_scheduled.set(false);
if self.software_cursor_change.get() == Change::AwaitingLatch {
self.software_cursor_change.set(Change::None);
}
if self.hardware_cursor_change.get() == Change::AwaitingLatch {
self.hardware_cursor_change.set(Change::None);
}
self.iteration.fetch_add(1);
self.trigger();
}
@ -126,25 +140,26 @@ impl OutputSchedule {
}
pub fn hardware_cursor_changed(&self) {
if !self.needs_hardware_cursor_commit.replace(true) {
if self.hardware_cursor_change.get() == Change::None {
self.hardware_cursor_change.set(Change::Scheduled);
self.trigger();
}
}
pub fn software_cursor_changed(&self) {
if !self.needs_software_cursor_damage.replace(true) {
if self.software_cursor_change.get() == Change::None {
self.software_cursor_change.set(Change::Scheduled);
self.trigger();
}
}
async fn run_once(&self) {
if self.present_scheduled.get() {
return;
}
if !self.needs_hardware_cursor_commit.get() && !self.needs_software_cursor_damage.get() {
return;
}
loop {
if self.hardware_cursor_change.get() != Change::Scheduled
&& self.software_cursor_change.get() != Change::Scheduled
{
return;
}
if !self.vrr_enabled.get() {
return;
}
@ -169,15 +184,15 @@ impl OutputSchedule {
}
pub fn commit_cursor(&self) {
if self.needs_hardware_cursor_commit.take() {
if self.hardware_cursor_change.get() == Change::Scheduled {
if let Some(hc) = self.hardware_cursor.get() {
hc.damage();
self.present_scheduled.set(true);
}
self.hardware_cursor_change.set(Change::AwaitingLatch);
}
if self.needs_software_cursor_damage.take() {
if self.software_cursor_change.get() == Change::Scheduled {
self.connector.damage();
self.present_scheduled.set(true);
self.software_cursor_change.set(Change::AwaitingLatch);
}
}
}