From 45fc49b216b3d1cceac1f576ba511845efb68a03 Mon Sep 17 00:00:00 2001
From: Rekai Musuka <rekai@musuka.dev>
Date: Fri, 21 Oct 2022 05:12:54 -0300
Subject: [PATCH] fix: reimplement halt fast-forwarding

---
 src/emu.zig | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/emu.zig b/src/emu.zig
index 815d5c8..faf62f1 100644
--- a/src/emu.zig
+++ b/src/emu.zig
@@ -51,14 +51,17 @@ pub fn run(quit: *Atomic(bool), fps: *FpsTracker, sched: *Scheduler, cpu: *Arm7t
 pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
     const frame_end = sched.tick + cycles_per_frame;
 
-    while (true) {
-        while (sched.tick < std.math.min(frame_end, sched.nextTimestamp())) {
-            if (cpu.stepDmaTransfer()) continue; // DMA is blocking, ticks scheduler
-            if (!cpu.isHalted()) cpu.step() else sched.tick += 1;
+    while (sched.tick < frame_end) {
+        if (!cpu.stepDmaTransfer()) {
+            if (cpu.isHalted()) {
+                // Fast-forward to next Event
+                sched.tick = sched.queue.peek().?.tick;
+            } else {
+                cpu.step();
+            }
         }
 
-        if (sched.tick >= frame_end) break;
-        sched.handleEvent(cpu);
+        if (sched.tick >= sched.nextTimestamp()) sched.handleEvent(cpu);
     }
 }