Implement event-based scheduler instead of lock-step components

src/core/spu.h

@@ -3,11 +3,12 @@
 #include "common/fifo_queue.h"
 #include "types.h"
 #include <array>
+#include <memory>
 
-class AudioStream;
 class StateWrapper;
 
 class System;
+class TimingEvent;
 class DMA;
 class InterruptController;
 
@@ -27,8 +28,6 @@ public:
   void DMARead(u32* words, u32 word_count);
   void DMAWrite(const u32* words, u32 word_count);
 
-  void Execute(TickCount ticks);
-
   // Render statistics debug window.
   void DrawDebugStateWindow();
 
@@ -40,6 +39,9 @@ public:
   }
   void EnsureCDAudioSpace(u32 num_samples);
 
+  // Executes the SPU, generating any pending samples.
+  void GeneratePendingSamples();
+
 private:
   static constexpr u32 RAM_SIZE = 512 * 1024;
   static constexpr u32 RAM_MASK = RAM_SIZE - 1;
@@ -282,11 +284,13 @@ private:
 
   void ReadADPCMBlock(u16 address, ADPCMBlock* block);
   std::tuple<s32, s32> SampleVoice(u32 voice_index);
-  void GenerateSample();
+  void Execute(TickCount ticks);
+  void UpdateEventInterval();
 
   System* m_system = nullptr;
   DMA* m_dma = nullptr;
   InterruptController* m_interrupt_controller = nullptr;
+  std::unique_ptr<TimingEvent> m_sample_event = nullptr;
 
   SPUCNT m_SPUCNT = {};
   SPUSTAT m_SPUSTAT = {};