Play-/Source/ee/Timer.h

#pragma once

#include "Types.h"
#include "INTC.h"
#include "zip/ZipArchiveWriter.h"
#include "zip/ZipArchiveReader.h"

class CGSHandler;

class CTimer
{
public:
	enum
	{
		MODE_CLOCK_SELECT = 0x003,

		MODE_CLOCK_SELECT_BUSCLOCK = 0x000,
		MODE_CLOCK_SELECT_BUSCLOCK16 = 0x001,
		MODE_CLOCK_SELECT_BUSCLOCK256 = 0x002,
		MODE_CLOCK_SELECT_EXTERNAL = 0x003,

		MODE_GATE_ENABLE = 0x004,

		MODE_GATE_SELECT = 0x008,
		MODE_GATE_SELECT_HBLANK = 0x000,
		MODE_GATE_SELECT_VBLANK = 0x008,

		MODE_GATE_MODE = 0x030,
		MODE_GATE_MODE_COUNTLOW = 0x000,
		MODE_GATE_MODE_HIGHEDGE = 0x010,
		MODE_GATE_MODE_LOWEDGE = 0x020,
		MODE_GATE_MODE_BOTHEDGE = 0x030,

		MODE_ZERO_RETURN = 0x040,
		MODE_COUNT_ENABLE = 0x080,
		MODE_EQUAL_INT_ENABLE = 0x100,
		MODE_OVERFLOW_INT_ENABLE = 0x200,
		MODE_EQUAL_FLAG = 0x400,
		MODE_OVERFLOW_FLAG = 0x800,
	};

	enum REGISTER
	{
		T1_COUNT = 0x10000800,

		T2_MODE = 0x10001010,

		T3_COUNT = 0x10001800,
		T3_MODE = 0x10001810,
		T3_COMP = 0x10001820,
	};

	CTimer(CINTC&, CGSHandler*&);
	virtual ~CTimer() = default;

	void Reset();

	void Count(unsigned int);

	uint32 GetRegister(uint32);
	void SetRegister(uint32, uint32);

	void LoadState(Framework::CZipArchiveReader&);
	void SaveState(Framework::CZipArchiveWriter&);

	void NotifyVBlankStart();
	void NotifyVBlankEnd();

private:
	enum
	{
		MAX_TIMER = 4,
	};

	void DisassembleGet(uint32);
	void DisassembleSet(uint32, uint32);

	void ProcessGateEdgeChange(uint32, uint32);

	struct TIMER
	{
		uint32 nCOUNT;
		uint32 nMODE;
		uint32 nCOMP;
		uint32 nHOLD;

		uint32 clockRemain;
	};

	TIMER m_timer[MAX_TIMER];
	CINTC& m_intc;
	CGSHandler*& m_gs;
};