Delay singlecore gpu interrupts

Fixes Bomberman Jetters in single core mode.

When single core mode pauses the CPU to execute the GPU
FIFO it greedily executes the whole thing. Before this commit,
Finish and Token interrupts would happen instantly, not even
taking into account how long the current FIFO window has
taken to execute. The interrupts would be effectively backdated
to the start of this execution window.

This commit does two things: It pipes the current FIFO window
execution time though to the interrupt scheduling and it enforces
a minimum delay of 500 cycles before an interrupt will be fired.

Source/Core/VideoCommon/BPMemory.h

@@ -2205,7 +2205,7 @@ struct BPMemory
 
 extern BPMemory bpmem;
 
-void LoadBPReg(u32 value0);
+void LoadBPReg(u32 value0, int cycles_into_future);
-void LoadBPRegPreprocess(u32 value0);
+void LoadBPRegPreprocess(u32 value0, int cycles_into_future);
 
 std::pair<std::string, std::string> GetBPRegInfo(u8 cmd, u32 cmddata);

Source/Core/VideoCommon/BPStructs.cpp

@@ -50,7 +50,7 @@ void BPInit()
   bpmem.bpMask = 0xFFFFFF;
 }
 
-static void BPWritten(const BPCmd& bp)
+static void BPWritten(const BPCmd& bp, int cycles_into_future)
 {
   /*
   ----------------------------------------------------------------------------------------------------------------
@@ -180,7 +180,7 @@ static void BPWritten(const BPCmd& bp)
       g_texture_cache->FlushEFBCopies();
       g_framebuffer_manager->InvalidatePeekCache(false);
       if (!Fifo::UseDeterministicGPUThread())
-        PixelEngine::SetFinish();  // may generate interrupt
+        PixelEngine::SetFinish(cycles_into_future);  // may generate interrupt
       DEBUG_LOG_FMT(VIDEO, "GXSetDrawDone SetPEFinish (value: {:#04X})", bp.newvalue & 0xFFFF);
       return;
 
@@ -193,14 +193,14 @@ static void BPWritten(const BPCmd& bp)
     g_texture_cache->FlushEFBCopies();
     g_framebuffer_manager->InvalidatePeekCache(false);
     if (!Fifo::UseDeterministicGPUThread())
-      PixelEngine::SetToken(static_cast<u16>(bp.newvalue & 0xFFFF), false);
+      PixelEngine::SetToken(static_cast<u16>(bp.newvalue & 0xFFFF), false, cycles_into_future);
     DEBUG_LOG_FMT(VIDEO, "SetPEToken {:#06X}", bp.newvalue & 0xFFFF);
     return;
   case BPMEM_PE_TOKEN_INT_ID:  // Pixel Engine Interrupt Token ID
     g_texture_cache->FlushEFBCopies();
     g_framebuffer_manager->InvalidatePeekCache(false);
     if (!Fifo::UseDeterministicGPUThread())
-      PixelEngine::SetToken(static_cast<u16>(bp.newvalue & 0xFFFF), true);
+      PixelEngine::SetToken(static_cast<u16>(bp.newvalue & 0xFFFF), true, cycles_into_future);
     DEBUG_LOG_FMT(VIDEO, "SetPEToken + INT {:#06X}", bp.newvalue & 0xFFFF);
     return;
 
@@ -717,7 +717,7 @@ static void BPWritten(const BPCmd& bp)
 }
 
 // Call browser: OpcodeDecoding.cpp ExecuteDisplayList > Decode() > LoadBPReg()
-void LoadBPReg(u32 value0)
+void LoadBPReg(u32 value0, int cycles_into_future)
 {
   int regNum = value0 >> 24;
   int oldval = ((u32*)&bpmem)[regNum];
@@ -730,10 +730,10 @@ void LoadBPReg(u32 value0)
   if (regNum != BPMEM_BP_MASK)
     bpmem.bpMask = 0xFFFFFF;
 
-  BPWritten(bp);
+  BPWritten(bp, cycles_into_future);
 }
 
-void LoadBPRegPreprocess(u32 value0)
+void LoadBPRegPreprocess(u32 value0, int cycles_into_future)
 {
   int regNum = value0 >> 24;
   // masking could hypothetically be a problem
@@ -742,13 +742,13 @@ void LoadBPRegPreprocess(u32 value0)
   {
   case BPMEM_SETDRAWDONE:
     if ((newval & 0xff) == 0x02)
-      PixelEngine::SetFinish();
+      PixelEngine::SetFinish(cycles_into_future);
     break;
   case BPMEM_PE_TOKEN_ID:
-    PixelEngine::SetToken(newval & 0xffff, false);
+    PixelEngine::SetToken(newval & 0xffff, false, cycles_into_future);
     break;
   case BPMEM_PE_TOKEN_INT_ID:  // Pixel Engine Interrupt Token ID
-    PixelEngine::SetToken(newval & 0xffff, true);
+    PixelEngine::SetToken(newval & 0xffff, true, cycles_into_future);
     break;
   }
 }

Source/Core/VideoCommon/OpcodeDecoding.cpp

@@ -221,11 +221,11 @@ u8* Run(DataReader src, u32* cycles, bool in_display_list)
         const u32 bp_cmd = src.Read<u32>();
         if constexpr (is_preprocess)
         {
-          LoadBPRegPreprocess(bp_cmd);
+          LoadBPRegPreprocess(bp_cmd, total_cycles);
         }
         else
         {
-          LoadBPReg(bp_cmd);
+          LoadBPReg(bp_cmd, total_cycles);
           INCSTAT(g_stats.this_frame.num_bp_loads);
         }
       }

Source/Core/VideoCommon/PixelEngine.cpp

@@ -277,7 +277,7 @@ static void SetTokenFinish_OnMainThread(u64 userdata, s64 cyclesLate)
 // Raise the event handler above on the CPU thread.
 // s_token_finish_mutex must be locked.
 // THIS IS EXECUTED FROM VIDEO THREAD
-static void RaiseEvent()
+static void RaiseEvent(int cycles_into_future)
 {
   if (s_event_raised)
     return;
@@ -285,14 +285,21 @@ static void RaiseEvent()
   s_event_raised = true;
 
   CoreTiming::FromThread from = CoreTiming::FromThread::NON_CPU;
+  s64 cycles = 0;  // we don't care about timings for dual core mode.
   if (!SConfig::GetInstance().bCPUThread || Fifo::UseDeterministicGPUThread())
+  {
     from = CoreTiming::FromThread::CPU;
-  CoreTiming::ScheduleEvent(0, et_SetTokenFinishOnMainThread, 0, from);
+
+    // Hack: Dolphin's single-core gpu timings are way too fast. Enforce a minimum delay to give
+    //       games time to setup any interrupt state
+    cycles = std::max(500, cycles_into_future);
+  }
+  CoreTiming::ScheduleEvent(cycles, et_SetTokenFinishOnMainThread, 0, from);
 }
 
 // SetToken
 // THIS IS EXECUTED FROM VIDEO THREAD
-void SetToken(const u16 token, const bool interrupt)
+void SetToken(const u16 token, const bool interrupt, int cycles_into_future)
 {
   DEBUG_LOG_FMT(PIXELENGINE, "VIDEO Backend raises INT_CAUSE_PE_TOKEN (btw, token: {:04x})", token);
 
@@ -301,12 +308,12 @@ void SetToken(const u16 token, const bool interrupt)
   s_token_pending = token;
   s_token_interrupt_pending |= interrupt;
 
-  RaiseEvent();
+  RaiseEvent(cycles_into_future);
 }
 
 // SetFinish
 // THIS IS EXECUTED FROM VIDEO THREAD (BPStructs.cpp) when a new frame has been drawn
-void SetFinish()
+void SetFinish(int cycles_into_future)
 {
   DEBUG_LOG_FMT(PIXELENGINE, "VIDEO Set Finish");
 
@@ -314,7 +321,7 @@ void SetFinish()
 
   s_finish_interrupt_pending |= true;
 
-  RaiseEvent();
+  RaiseEvent(cycles_into_future);
 }
 
 UPEAlphaReadReg GetAlphaReadMode()

Source/Core/VideoCommon/PixelEngine.h

@@ -61,8 +61,8 @@ void DoState(PointerWrap& p);
 void RegisterMMIO(MMIO::Mapping* mmio, u32 base);
 
 // gfx backend support
-void SetToken(const u16 token, const bool interrupt);
+void SetToken(const u16 token, const bool interrupt, int cycle_delay);
-void SetFinish();
+void SetFinish(int cycle_delay);
 UPEAlphaReadReg GetAlphaReadMode();
 
 }  // namespace PixelEngine