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fix(emu): prevent infinite loop when advancing scheduler

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-03 19:46:24 -06:00
parent c9f0e1632c
commit 1d4ba2e2b3
1 changed files with 7 additions and 9 deletions
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16
src/emu.zig
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@ -1,19 +1,17 @@
const _ = @import("std");
const Scheduler = @import("scheduler.zig").Scheduler; const Scheduler = @import("scheduler.zig").Scheduler;
const Arm7tdmi = @import("cpu.zig").Arm7tdmi; const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const Bus = @import("bus.zig").Bus; const Bus = @import("bus.zig").Bus;
const cycles_per_frame: u64 = 10_000; // TODO: How many cycles actually? const cycles_per_frame: u64 = 100; // TODO: How many cycles actually?
pub fn runFrame(sch: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void { pub fn runFrame(sch: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
const frame_end = sch.tick + cycles_per_frame; var cycles: u64 = 0;
while (cycles < cycles_per_frame) : (cycles += 1) {
while (sch.tick < frame_end) { sch.tick += 1;
while (sch.tick < sch.nextTimestamp()) { _ = cpu.step();
sch.tick += cpu.step();
}
while (sch.tick >= sch.nextTimestamp()) {
sch.handleEvent(cpu, bus); sch.handleEvent(cpu, bus);
} }
}
} }