VideoCommon/Fifo: Refactor to class, move to Core::System.

Source/Core/Core/Core.cpp

@@ -277,7 +277,9 @@ void Stop()  // - Hammertime!
   // Dump left over jobs
   HostDispatchJobs();
 
-  Fifo::EmulatorState(false);
+  auto& system = Core::System::GetInstance();
+
+  system.GetFifo().EmulatorState(false);
 
   INFO_LOG_FMT(CONSOLE, "Stop [Main Thread]\t\t---- Shutting down ----");
 
@@ -285,7 +287,7 @@ void Stop()  // - Hammertime!
   INFO_LOG_FMT(CONSOLE, "{}", StopMessage(true, "Stop CPU"));
   CPU::Stop();
 
-  if (Core::System::GetInstance().IsDualCoreMode())
+  if (system.IsDualCoreMode())
   {
     // Video_EnterLoop() should now exit so that EmuThread()
     // will continue concurrently with the rest of the commands
@@ -597,7 +599,7 @@ static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi
     wiifs_guard.Dismiss();
 
   // This adds the SyncGPU handler to CoreTiming, so now CoreTiming::Advance might block.
-  Fifo::Prepare();
+  system.GetFifo().Prepare();
 
   // Setup our core
   if (Config::Get(Config::MAIN_CPU_CORE) != PowerPC::CPUCore::Interpreter)
@@ -622,7 +624,7 @@ static void EmuThread(std::unique_ptr<BootParameters> boot, WindowSystemInfo wsi
     s_cpu_thread = std::thread(cpuThreadFunc, savestate_path, delete_savestate);
 
     // become the GPU thread
-    Fifo::RunGpuLoop();
+    system.GetFifo().RunGpuLoop();
 
     // We have now exited the Video Loop
     INFO_LOG_FMT(CONSOLE, "{}", StopMessage(false, "Video Loop Ended"));
@@ -766,7 +768,8 @@ static bool PauseAndLock(bool do_lock, bool unpause_on_unlock)
 
   // video has to come after CPU, because CPU thread can wait for video thread
   // (s_efbAccessRequested).
-  Fifo::PauseAndLock(do_lock, false);
+  auto& system = Core::System::GetInstance();
+  system.GetFifo().PauseAndLock(do_lock, false);
 
   ResetRumble();
 
@@ -1029,7 +1032,10 @@ void UpdateWantDeterminism(bool initial)
       const auto ios = IOS::HLE::GetIOS();
       if (ios)
         ios->UpdateWantDeterminism(new_want_determinism);
-      Fifo::UpdateWantDeterminism(new_want_determinism);
+
+      auto& system = Core::System::GetInstance();
+      system.GetFifo().UpdateWantDeterminism(new_want_determinism);
+
       // We need to clear the cache because some parts of the JIT depend on want_determinism,
       // e.g. use of FMA.
       JitInterface::ClearCache();