metaforce/NESEmulator/CNESEmulator.hpp

#pragma once

#include "RetroTypes.hpp"
#include "zeus/CColor.hpp"
#include "boo/graphicsdev/IGraphicsDataFactory.hpp"
#include "boo/audiodev/IAudioVoice.hpp"
#include "zeus/CMatrix4f.hpp"

namespace urde {
struct CFinalInput;
class IDvdRequest;

namespace MP1 {

#define NUM_AUDIO_BUFFERS 4

class CNESEmulator final : public boo::IAudioVoiceCallback {
public:
  enum class EPasswordEntryState { NotPasswordScreen, NotEntered, Entered };

private:
  static bool EmulatorConstructed;

  std::unique_ptr<u8[]> m_nesEmuPBuf;
  std::shared_ptr<IDvdRequest> m_dvdReq;

  struct Vert {
    zeus::CVector3f m_pos;
    zeus::CVector2f m_uv;
  };

  struct Uniform {
    zeus::CMatrix4f m_matrix;
    zeus::CColor m_color;
  };

  boo::ObjToken<boo::ITextureD> m_texture;
  boo::ObjToken<boo::IGraphicsBufferD> m_uniBuf;
  boo::ObjToken<boo::IGraphicsBufferS> m_vbo;
  boo::ObjToken<boo::IShaderDataBinding> m_shadBind;

  std::unique_ptr<u8[]> m_audioBufBlock;
  u8* m_audioBufs[NUM_AUDIO_BUFFERS];
  uint32_t m_headBuf = 0;
  uint32_t m_tailBuf = 0;
  uint32_t m_procBufs = NUM_AUDIO_BUFFERS;
  uint32_t m_posInHeadBuf = 0;
  uint32_t m_posInTailBuf = 0;
  boo::ObjToken<boo::IAudioVoice> m_booVoice;

  // void* x4_loadBuf;
  // void* x8_rom;
  // void* xc_state;
  // OSModuleInfo* x10_module = x4_loadBuf;
  // void* x14_bss;
  // void* x18_prgram;
  // void* x1c_wram;
  bool x20_gameOver = false;
  u8 x21_passwordFromNES[18];
  EPasswordEntryState x34_passwordEntryState = EPasswordEntryState::NotPasswordScreen;
  bool x38_passwordPending = false;
  u8 x39_passwordToNES[18];
  static void DecryptMetroid(u8* dataIn, u8* dataOut, u32 decLen = 0x20000, u8 decByte = 0xe9, u32 xorLen = 0x1FFFC,
                             u32 xorVal = 0xA663);
  void InitializeEmulator();
  void DeinitializeEmulator();
  void NesEmuMainLoop(bool forceDraw = false);
  static bool CheckForGameOver(const u8* vram, u8* passwordOut = nullptr);
  static EPasswordEntryState CheckForPasswordEntryScreen(const uint8_t* vram);
  static bool SetPasswordIntoEntryScreen(u8* vram, u8* wram, const u8* password);

public:
  CNESEmulator();
  ~CNESEmulator();
  void ProcessUserInput(const CFinalInput& input, int);
  void Update();
  void Draw(const zeus::CColor& mulColor, bool filtering);
  void LoadPassword(const u8* state);
  const u8* GetPassword() const { return x21_passwordFromNES; }
  bool IsGameOver() const { return x20_gameOver; }
  EPasswordEntryState GetPasswordEntryState() const { return x34_passwordEntryState; }

  int audioUpdate();
  void preSupplyAudio(boo::IAudioVoice& voice, double dt) {}
  size_t supplyAudio(boo::IAudioVoice& voice, size_t frames, int16_t* data);
};

} // namespace MP1
} // namespace urde