GBA: Allow pausing event loop while CPU is blocked

CHANGES

@@ -56,6 +56,7 @@ Other fixes:
  - Wii: Fix pixelated filtering on interframe blending (fixes mgba.io/i/1830)
 Misc:
  - GB: Allow pausing event loop while CPU is blocked
+ - GBA: Allow pausing event loop while CPU is blocked
  - Debugger: Keep track of global cycle count
  - FFmpeg: Add looping option for GIF/APNG
  - FFmpeg: Use range coder for FFV1 to reduce output size

include/mgba/internal/gba/serialize.h

@@ -236,6 +236,7 @@ DECL_BITFIELD(GBASerializedMiscFlags, uint32_t);
 DECL_BIT(GBASerializedMiscFlags, Halted, 0);
 DECL_BIT(GBASerializedMiscFlags, POSTFLG, 1);
 DECL_BIT(GBASerializedMiscFlags, IrqPending, 2);
+DECL_BIT(GBASerializedMiscFlags, Blocked, 3);
 
 struct GBASerializedState {
 	uint32_t versionMagic;

src/gba/gba.c

@@ -286,7 +286,7 @@ static void GBAProcessEvents(struct ARMCore* cpu) {
 			}
 #endif
 			nextEvent = mTimingTick(&gba->timing, cycles < nextEvent ? nextEvent : cycles);
-		} while (gba->cpuBlocked);
+		} while (gba->cpuBlocked && !gba->earlyExit);
 
 		cpu->nextEvent = nextEvent;
 		if (cpu->halted) {
@@ -305,11 +305,9 @@ static void GBAProcessEvents(struct ARMCore* cpu) {
 		}
 	}
 	gba->earlyExit = false;
-#ifndef NDEBUG
 	if (gba->cpuBlocked) {
-		mLOG(GBA, FATAL, "CPU is blocked!");
+		cpu->cycles = cpu->nextEvent;
 	}
-#endif
 }
 
 #ifdef USE_DEBUGGERS

src/gba/serialize.c

@@ -67,6 +67,7 @@ void GBASerialize(struct GBA* gba, struct GBASerializedState* state) {
 		miscFlags = GBASerializedMiscFlagsFillIrqPending(miscFlags);
 		STORE_32(gba->irqEvent.when - mTimingCurrentTime(&gba->timing), 0, &state->nextIrq);
 	}
+	miscFlags = GBASerializedMiscFlagsSetBlocked(miscFlags, gba->cpuBlocked);
 	STORE_32(miscFlags, 0, &state->miscFlags);
 
 	GBAMemorySerialize(&gba->memory, state);
@@ -185,6 +186,7 @@ bool GBADeserialize(struct GBA* gba, const struct GBASerializedState* state) {
 		LOAD_32(when, 0, &state->nextIrq);
 		mTimingSchedule(&gba->timing, &gba->irqEvent, when);		
 	}
+	gba->cpuBlocked = GBASerializedMiscFlagsGetBlocked(miscFlags);
 
 	GBAVideoDeserialize(&gba->video, state);
 	GBAMemoryDeserialize(&gba->memory, state);

src/gba/video.c

@@ -175,6 +175,7 @@ void _startHdraw(struct mTiming* timing, void* context, uint32_t cyclesLate) {
 			video->frameskipCounter = video->frameskip;
 		}
 		++video->frameCounter;
+		video->p->earlyExit = true;
 		break;
 	case VIDEO_VERTICAL_TOTAL_PIXELS - 1:
 		video->p->memory.io[REG_DISPSTAT >> 1] = GBARegisterDISPSTATClearInVblank(dispstat);