Mesen/Core/APU.h

#pragma once

#include "stdafx.h"
#include "IMemoryHandler.h"
#include "IAudioDevice.h"
#include "Snapshotable.h"
#include "EmulationSettings.h"

class MemoryManager;
class SquareChannel;
class TriangleChannel;
class NoiseChannel;
class DeltaModulationChannel;
class ApuFrameCounter;
class SoundMixer;
enum class FrameType;
enum class NesModel;

class APU : public Snapshotable, public IMemoryHandler
{
	private:
		static APU* Instance;
		static bool _apuEnabled;

		uint32_t _previousCycle;
		uint32_t _currentCycle;

		unique_ptr<SquareChannel> _squareChannel[2];
		unique_ptr<TriangleChannel> _triangleChannel;
		unique_ptr<NoiseChannel> _noiseChannel;
		unique_ptr<DeltaModulationChannel> _deltaModulationChannel;

		unique_ptr<ApuFrameCounter> _frameCounter;

		MemoryManager* _memoryManager;

		shared_ptr<SoundMixer> _mixer;

		NesModel _nesModel;

		double _cyclesNeeded;

	private:
		__forceinline bool NeedToRun(uint32_t currentCycle);
		void Run();

		static void FrameCounterTick(FrameType type);

	protected:
		void StreamState(bool saving) override;

	public:
		APU(MemoryManager* memoryManager);
		~APU();

		void EndFrame();

		void Reset(bool softReset);
		void SetNesModel(NesModel model, bool forceInit = false);

		uint8_t ReadRAM(uint16_t addr) override;
		void WriteRAM(uint16_t addr, uint8_t value) override;
		void GetMemoryRanges(MemoryRanges &ranges) override;

		ApuState GetState();

		void Exec();

		__forceinline static void ExecStatic()
		{
			if(APU::_apuEnabled) {
				if(EmulationSettings::GetOverclockRate() == 100 || !EmulationSettings::GetOverclockAdjustApu()) {
					Instance->Exec();
				} else {
					Instance->_cyclesNeeded += 1.0 / ((double)EmulationSettings::GetOverclockRate() / 100.0);
					while(Instance->_cyclesNeeded >= 1.0) {
						Instance->Exec();
						Instance->_cyclesNeeded--;
					}
				}
			}
		}

		static void StaticRun();

		static void AddExpansionAudioDelta(AudioChannel channel, int16_t delta);
		static void SetApuStatus(bool enabled);
		static bool IsApuEnabled();
};