Refactor SetCpStatus into two functions for from-GPU and from-CPU mode rather than a boolean parameter.

This shouldn't affect functionality.  I'm not sure if the breakpoint
distinction is actually necessary (my commit messages from the old
dc-netplay last year claim that breakpoints are broken anyway, but I
don't remember why), but I don't actually need to change this part of
the code (yet), so I'll stick with the trimmings change for now.

Source/Core/VideoCommon/CommandProcessor.cpp

@@ -317,7 +317,7 @@ void STACKALIGN GatherPipeBursted()
 	}
 
 	if (IsOnThread())
-		SetCpStatus(true);
+		SetCPStatusFromCPU();
 
 	// update the fifo pointer
 	if (fifo.CPWritePointer >= fifo.CPEnd)
@@ -361,30 +361,17 @@ void UpdateInterruptsFromVideoBackend(u64 userdata)
 	CoreTiming::ScheduleEvent_Threadsafe(0, et_UpdateInterrupts, userdata);
 }
 
-void SetCpStatus(bool isCPUThread)
+void SetCPStatusFromGPU()
 {
-	// overflow & underflow check
-	fifo.bFF_HiWatermark = (fifo.CPReadWriteDistance > fifo.CPHiWatermark);
-	fifo.bFF_LoWatermark = (fifo.CPReadWriteDistance < fifo.CPLoWatermark);
-
 	// breakpoint
-	if (!isCPUThread)
+	if (fifo.bFF_BPEnable)
 	{
-		if (fifo.bFF_BPEnable)
+		if (fifo.CPBreakpoint == fifo.CPReadPointer)
 		{
-			if (fifo.CPBreakpoint == fifo.CPReadPointer)
+			if (!fifo.bFF_Breakpoint)
 			{
-				if (!fifo.bFF_Breakpoint)
-				{
-					INFO_LOG(COMMANDPROCESSOR, "Hit breakpoint at %i", fifo.CPReadPointer);
-					fifo.bFF_Breakpoint = true;
-				}
-			}
-			else
-			{
-				if (fifo.bFF_Breakpoint)
-					INFO_LOG(COMMANDPROCESSOR, "Cleared breakpoint at %i", fifo.CPReadPointer);
-				fifo.bFF_Breakpoint = false;
+				INFO_LOG(COMMANDPROCESSOR, "Hit breakpoint at %i", fifo.CPReadPointer);
+				fifo.bFF_Breakpoint = true;
 			}
 		}
 		else
@@ -394,6 +381,20 @@ void SetCpStatus(bool isCPUThread)
 			fifo.bFF_Breakpoint = false;
 		}
 	}
+	else
+	{
+		if (fifo.bFF_Breakpoint)
+			INFO_LOG(COMMANDPROCESSOR, "Cleared breakpoint at %i", fifo.CPReadPointer);
+		fifo.bFF_Breakpoint = false;
+	}
+	SetCPStatusFromCPU();
+}
+
+void SetCPStatusFromCPU()
+{
+	// overflow & underflow check
+	fifo.bFF_HiWatermark = (fifo.CPReadWriteDistance > fifo.CPHiWatermark);
+	fifo.bFF_LoWatermark = (fifo.CPReadWriteDistance < fifo.CPLoWatermark);
 
 	bool bpInt = fifo.bFF_Breakpoint && fifo.bFF_BPInt;
 	bool ovfInt = fifo.bFF_HiWatermark && fifo.bFF_HiWatermarkInt;
@@ -408,15 +409,14 @@ void SetCpStatus(bool isCPUThread)
 		{
 			if (!interrupt || bpInt || undfInt || ovfInt)
 			{
-				if (!isCPUThread)
+				if (Core::IsGPUThread())
 				{
-					// GPU thread:
+					// Schedule the interrupt asynchronously
 					interruptWaiting = true;
 					CommandProcessor::UpdateInterruptsFromVideoBackend(userdata);
 				}
 				else
 				{
-					// CPU thread:
 					interruptSet = interrupt;
 					INFO_LOG(COMMANDPROCESSOR,"Interrupt set");
 					ProcessorInterface::SetInterrupt(INT_CAUSE_CP, interrupt);

Source/Core/VideoCommon/CommandProcessor.h

@@ -135,7 +135,8 @@ void DoState(PointerWrap &p);
 
 void RegisterMMIO(MMIO::Mapping* mmio, u32 base);
 
-void SetCpStatus(bool isCPUThread = false);
+void SetCPStatusFromGPU();
+void SetCPStatusFromCPU();
 void GatherPipeBursted();
 void UpdateInterrupts(u64 userdata);
 void UpdateInterruptsFromVideoBackend(u64 userdata);

Source/Core/VideoCommon/Fifo.cpp

@@ -148,7 +148,7 @@ void RunGpuLoop()
 
 		VideoFifo_CheckAsyncRequest();
 
-		CommandProcessor::SetCpStatus();
+		CommandProcessor::SetCPStatusFromGPU();
 
 		Common::AtomicStore(CommandProcessor::VITicks, CommandProcessor::m_cpClockOrigin);
 
@@ -184,7 +184,7 @@ void RunGpuLoop()
 					Common::AtomicStore(fifo.SafeCPReadPointer, fifo.CPReadPointer);
 			}
 
-			CommandProcessor::SetCpStatus();
+			CommandProcessor::SetCPStatusFromGPU();
 
 			// This call is pretty important in DualCore mode and must be called in the FIFO Loop.
 			// If we don't, s_swapRequested or s_efbAccessRequested won't be set to false
@@ -247,5 +247,5 @@ void RunGpu()
 
 		fifo.CPReadWriteDistance -= 32;
 	}
-	CommandProcessor::SetCpStatus();
+	CommandProcessor::SetCPStatusFromGPU();
 }