0xrsydn/gameboy-rust
1
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

fix(timers): retain shared free-running prescaler phase

Browse source
This commit is contained in:
0xrsydn 2026-10-06 22:04:59 +07:00
commit 27806ccf9e
13 changed files with 459 additions and 32 deletions
Download patch file Download diff file Expand all files Collapse all files

5
crates/gba-core/src/io/timer_step.rs
View file

@ -7,6 +7,7 @@ pub(super) const TIMER_IRQ_MASK: u16 = 0x78;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) struct TimerStep {
pub(super) timers: [Timer; 4],
pub(super) phase: u16,
pub(super) pending: u16,
elapsed: u32,
}
@ -15,6 +16,7 @@ impl TimerStep {
pub(super) fn new(io: &Io) -> Self {
Self {
timers: io.timers,
phase: io.timer_phase,
pending: io.pending & TIMER_IRQ_MASK,
elapsed: 0,
}
@ -22,7 +24,8 @@ impl TimerStep {
pub(crate) fn advance_to(&mut self, elapsed: u32) {
assert!(elapsed >= self.elapsed, "timer step time must be monotonic");
self.pending |= Io::advance_timer_bank(&mut self.timers, elapsed - self.elapsed);
self.pending |=
Io::advance_timer_bank(&mut self.timers, &mut self.phase, elapsed - self.elapsed);
self.elapsed = elapsed;
}