minor tweak to interrupt system (#211)

src/device.rs

@@ -196,6 +196,7 @@ impl Device {
                     regs: [0; cop0::COP0_REGS_COUNT as usize],
                     reg_write_masks: [0; cop0::COP0_REGS_COUNT as usize],
                     reg_latch: 0,
+                    is_event: false,
                     pending_compare_interrupt: false,
                     instrs: [cop0::reserved; 32],
                     instrs2: [cop0::reserved; 32],

src/device/cop0.rs

@@ -97,6 +97,7 @@ pub struct Cop0 {
     pub tlb_lut_r: Vec<device::tlb::TlbLut>,
     pub tlb_lut_w: Vec<device::tlb::TlbLut>,
     pub tlb_entries: [device::tlb::TlbEntry; 32],
+    pub is_event: bool,
     pub pending_compare_interrupt: bool,
 }
 

src/device/events.rs

@@ -53,7 +53,9 @@ pub fn trigger_event(device: &mut device::Device) {
     device.cpu.events[next_event_name].enabled = false;
 
     let handler = device.cpu.events[next_event_name].handler;
+    device.cpu.cop0.is_event = true;
     handler(device);
+    device.cpu.cop0.is_event = false;
     set_next_event(device);
 }
 

src/device/exceptions.rs

@@ -30,7 +30,7 @@ pub fn check_pending_interrupts(device: &mut device::Device) {
         return;
     }
 
-    if device.cpu.cop0.regs[device::cop0::COP0_CAUSE_REG as usize] == device::cop0::COP0_CAUSE_IP7 {
+    if device.cpu.cop0.is_event {
         interrupt_exception(device);
     } else {
         device::events::create_event(

src/ui/audio.rs

@@ -116,7 +116,7 @@ pub fn play_audio(device: &mut device::Device, dram_addr: usize, length: u64) {
     let min_latency = (device.ui.audio_freq * 0.02) * 4.0;
 
     if audio_queued < min_latency {
-        let silence_buffer: Vec<u8> = vec![0; (min_latency - audio_queued) as usize & !3];
+        let silence_buffer: Vec<u8> = vec![0; min_latency as usize & !3];
         if !unsafe {
             sdl3_sys::audio::SDL_PutAudioStreamData(
                 device.ui.audio_stream,