GB: Add interrupt function for early exit

Author: endrift

include/mgba/internal/gb/gb.h

@@ -197,6 +197,8 @@ void GBTestKeypadIRQ(struct GB* gb);
 void GBFrameStarted(struct GB* gb);
 void GBFrameEnded(struct GB* gb);
 
+void GBInterrupt(struct GB* gb);
+
 CXX_GUARD_END
 
 #endif

src/gb/audio.c

@@ -840,7 +840,7 @@ static void _sample(struct mTiming* timing, void* user, uint32_t cyclesLate) {
 	}
 	if (!mCoreSyncProduceAudio(audio->p->sync, &audio->buffer)) {
 		// Interrupted
-		audio->p->earlyExit = true;
+		GBInterrupt(audio->p);
 	}
 	mTimingSchedule(timing, &audio->sampleEvent, audio->sampleInterval * audio->timingFactor - cyclesLate);
 }

src/gb/core.c

@@ -1431,7 +1431,7 @@ static void _GBVLPStartFrameCallback(void *context) {
 		GBVideoProxyRendererUnshim(&gb->video, &gbcore->proxyRenderer);
 		mVideoLogContextRewind(gbcore->logContext, core);
 		GBVideoProxyRendererShim(&gb->video, &gbcore->proxyRenderer);
-		gb->earlyExit = true;
+		GBInterrupt(gb);
 	}
 }
 

src/gb/gb.c

@@ -976,7 +976,7 @@ void GBProcessEvents(struct SM83Core* cpu) {
 				gb->timing.globalCycles += nextEvent;
 #endif
 				nextEvent = mTimingTick(&gb->timing, nextEvent);
-			} while (gb->cpuBlocked);
+			} while (gb->cpuBlocked && !gb->earlyExit);
 			// This loop cannot early exit until the SM83 run loop properly handles mid-M-cycle-exits
 			cpu->nextEvent = nextEvent;
 
@@ -1219,6 +1219,11 @@ void GBFrameEnded(struct GB* gb) {
 	}
 }
 
+void GBInterrupt(struct GB* gb) {
+	gb->earlyExit = true;
+	mTimingInterrupt(&gb->timing);
+}
+
 enum GBModel GBNameToModel(const char* model) {
 	if (strcasecmp(model, "DMG") == 0 || strcasecmp(model, "GB") == 0) {
 		return GB_MODEL_DMG;

src/gb/sio/lockstep.c

@@ -237,7 +237,7 @@ static void _GBSIOLockstepNodeProcessEvents(struct mTiming* timing, void* user,
 		mTimingDeschedule(timing, &node->event);
 		mTimingSchedule(timing, &node->event, cycles);
 	} else {
-		node->d.p->p->earlyExit = true;
+		GBInterrupt(node->d.p->p);
 		mTimingSchedule(timing, &node->event, cyclesLate + 1);
 	}
 }

src/gb/video.c

@@ -686,7 +686,7 @@ void _updateFrameCount(struct mTiming* timing, void* context, uint32_t cyclesLat
 	GBFrameEnded(video->p);
 	mCoreSyncPostFrame(video->p->sync);
 	++video->frameCounter;
-	video->p->earlyExit = true;
+	GBInterrupt(video->p);
 
 	GBFrameStarted(video->p);
 }