backend-infra-engineer: Pre-0.2.2 snapshot (2023)

src/app/emu/snes.h

@@ -0,0 +1,120 @@
+#ifndef YAZE_APP_EMU_SNES_H
+#define YAZE_APP_EMU_SNES_H
+
+#include <cstdint>
+#include <memory>
+#include <string>
+#include <thread>
+
+#include "app/emu/audio/apu.h"
+#include "app/emu/audio/spc700.h"
+#include "app/emu/cpu/clock.h"
+#include "app/emu/cpu/cpu.h"
+#include "app/emu/debug/debugger.h"
+#include "app/emu/memory/dma.h"
+#include "app/emu/memory/memory.h"
+#include "app/emu/video/ppu.h"
+#include "app/rom.h"
+
+namespace yaze {
+namespace app {
+namespace emu {
+
+class SNES : public DMA {
+ public:
+  SNES() = default;
+  ~SNES() = default;
+
+  ROMInfo ReadRomHeader(uint32_t offset);
+
+  // Initialization
+  void Init(ROM& rom);
+
+  // Main emulation loop
+  void Run();
+
+  // Step through a single instruction
+  void StepRun();
+
+  // Enable NMI Interrupts
+  void EnableVBlankInterrupts();
+
+  // Wait until the VBlank routine has been processed
+  void WaitForVBlank();
+
+  // NMI Interrupt Service Routine
+  void NmiIsr();
+
+  // VBlank routine
+  void VBlankRoutine();
+
+  // Boot the APU with the IPL ROM
+  void BootApuWithIPL();
+  void StartApuDataTransfer();
+
+  // Controller input handling
+  void HandleInput();
+
+  // Save/Load game state
+  void SaveState(const std::string& path);
+  void LoadState(const std::string& path);
+
+  bool running() const { return running_; }
+
+  auto cpu() -> CPU& { return cpu_; }
+  auto ppu() -> Ppu& { return ppu_; }
+  auto Memory() -> MemoryImpl* { return &memory_; }
+
+  void SetCpuMode(int mode) { cpu_mode_ = mode; }
+  CPU::UpdateMode GetCpuMode() const {
+    return static_cast<CPU::UpdateMode>(cpu_mode_);
+  }
+
+  void SetupMemory(ROM& rom) {
+    // Setup observers for the memory space
+    memory_.AddObserver(&apu_);
+    memory_.AddObserver(&ppu_);
+
+    // Load the ROM into memory and set up the memory mapping
+    rom_data = rom.vector();
+    memory_.Initialize(rom_data);
+  }
+
+ private:
+  void WriteToRegister(uint16_t address, uint8_t value) {
+    memory_.WriteByte(address, value);
+  }
+
+  // Components of the SNES
+  MemoryImpl memory_;
+  ClockImpl clock_;
+  AudioRamImpl audio_ram_;
+
+  CPU cpu_{memory_, clock_};
+  Ppu ppu_{memory_, clock_};
+  APU apu_{memory_, audio_ram_, clock_};
+
+  // Helper classes
+  ROMInfo rom_info_;
+  Debugger debugger;
+
+  // Currently loaded ROM
+  std::vector<uint8_t> rom_data;
+
+  // Byte flag to indicate if the VBlank routine should be executed or not
+  std::atomic<bool> v_blank_flag_;
+
+  // 32-bit counter to track the number of NMI interrupts
+  std::atomic<uint32_t> frame_counter_;
+
+  // Other private member variables
+  bool running_ = false;
+  int scanline;
+  int cpu_mode_ = 0;
+};
+
+}  // namespace emu
+}  // namespace app
+}  // namespace yaze
+
+#endif  // YAZE_APP_EMU_SNES_H