/*****************************************************************************\
     Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
                This file is licensed under the Snes9x License.
   For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/

#ifndef _SNES9X_H_
#define _SNES9X_H_

#ifndef VERSION
#define VERSION	"1.63"
#endif

#include "port.h"
#include "65c816.h"
#include "messages.h"

/* All core file I/O goes through the libretro VFS via the
   file_stream_transforms wrappers (RFILE). The frontend supplies the
   VFS interface when available (see retro_set_environment);
   filestream falls back to its local implementation otherwise.
   Compressed (.gz) stream support from the old ZLIB build is gone --
   under libretro the frontend handles compressed content itself. */
#include <streams/file_stream_transforms.h>
#define FSTREAM					RFILE *
#define READ_FSTREAM(p, l, s)	rfread(p, 1, l, s)
#define WRITE_FSTREAM(p, l, s)	rfwrite(p, 1, l, s)
#define GETS_FSTREAM(p, l, s)	rfgets(p, l, s)
#define GETC_FSTREAM(s)			rfgetc(s)
#define OPEN_FSTREAM(f, m)		rfopen(f, m)
#define FIND_FSTREAM(s)			rftell(s)
#define REVERT_FSTREAM(s, o, p)	rfseek(s, o, p)
#define CLOSE_FSTREAM(s)			rfclose(s)


#define SNES_WIDTH					256
#define SNES_HEIGHT					224
#define SNES_HEIGHT_EXTENDED		239
#define MAX_SNES_WIDTH				(SNES_WIDTH * 2)
#define MAX_SNES_HEIGHT				(SNES_HEIGHT_EXTENDED * 2)

#define	NTSC_MASTER_CLOCK			21477272.727272 // 21477272 + 8/11 exact
#define	PAL_MASTER_CLOCK			21281370.0
#define NTSC_PROGRESSIVE_FRAME_RATE	60.09881389744051
#define NTSC_INTERLACED_FRAME_RATE	59.94005994
#define PAL_PROGRESSIVE_FRAME_RATE	50.006977968


#define SNES_MAX_NTSC_VCOUNTER		262
#define SNES_MAX_PAL_VCOUNTER		312
#define SNES_HCOUNTER_MAX			341

#ifndef ALLOW_CPU_OVERCLOCK
#define ONE_CYCLE					6
#define SLOW_ONE_CYCLE				8
#define TWO_CYCLES					12
#else
#define ONE_CYCLE      (Settings.OneClockCycle)
#define SLOW_ONE_CYCLE (Settings.OneSlowClockCycle)
#define TWO_CYCLES     (Settings.TwoClockCycles)
#endif
#define	ONE_DOT_CYCLE				4

#define SNES_CYCLES_PER_SCANLINE	(SNES_HCOUNTER_MAX * ONE_DOT_CYCLE)
#define SNES_SCANLINE_TIME			(SNES_CYCLES_PER_SCANLINE / NTSC_MASTER_CLOCK)

#define SNES_WRAM_REFRESH_HC_v1		530
#define SNES_WRAM_REFRESH_HC_v2		538
#define SNES_WRAM_REFRESH_CYCLES	40

#define SNES_HBLANK_START_HC		1096					// H=274
#define	SNES_HDMA_START_HC			1106					// FIXME: not true
#define	SNES_HBLANK_END_HC			4						// H=1
#define	SNES_HDMA_INIT_HC			20						// FIXME: not true
#define	SNES_RENDER_START_HC		(128 * ONE_DOT_CYCLE)	// FIXME: Snes9x renders a line at a time.

#define SNES_TR_MASK		(1 <<  4)
#define SNES_TL_MASK		(1 <<  5)
#define SNES_X_MASK			(1 <<  6)
#define SNES_A_MASK			(1 <<  7)
#define SNES_RIGHT_MASK		(1 <<  8)
#define SNES_LEFT_MASK		(1 <<  9)
#define SNES_DOWN_MASK		(1 << 10)
#define SNES_UP_MASK		(1 << 11)
#define SNES_START_MASK		(1 << 12)
#define SNES_SELECT_MASK	(1 << 13)
#define SNES_Y_MASK			(1 << 14)
#define SNES_B_MASK			(1 << 15)

#define DEBUG_MODE_FLAG		(1 <<  0)	// debugger
#define TRACE_FLAG			(1 <<  1)	// debugger
#define SINGLE_STEP_FLAG	(1 <<  2)	// debugger
#define BREAK_FLAG			(1 <<  3)	// debugger
#define SCAN_KEYS_FLAG		(1 <<  4)	// CPU
#define HALTED_FLAG			(1 << 12)	// APU
#define FRAME_ADVANCE_FLAG	(1 <<  9)

#define ROM_NAME_LEN	23
#define AUTO_FRAMERATE	200

struct SCPUState
{
	uint32	Flags;
	int32	Cycles;
	int32	PrevCycles;
	int32	V_Counter;
	uint8	*PCBase;
	bool8	NMIPending;
	bool8	IRQLine;
	bool8	IRQTransition;
	bool8	IRQLastState;
	bool8	IRQExternal;
	int32	IRQPending;
	int32	MemSpeed;
	int32	MemSpeedx2;
	int32	FastROMSpeed;
	bool8	InDMA;
	bool8	InHDMA;
	bool8	InDMAorHDMA;
	bool8	InWRAMDMAorHDMA;
	uint8	HDMARanInDMA;
	int32	CurrentDMAorHDMAChannel;
	uint8	WhichEvent;
	int32	NextEvent;
	bool8	WaitingForInterrupt;
	uint32	AutoSaveTimer;
	bool8	SRAMModified;
};

enum
{
	HC_HBLANK_START_EVENT = 1,
	HC_HDMA_START_EVENT   = 2,
	HC_HCOUNTER_MAX_EVENT = 3,
	HC_HDMA_INIT_EVENT    = 4,
	HC_RENDER_EVENT       = 5,
	HC_WRAM_REFRESH_EVENT = 6
};

enum
{
	IRQ_NONE        = 0x0,
	IRQ_SET_FLAG    = 0x1,
	IRQ_CLEAR_FLAG  = 0x2,
	IRQ_TRIGGER_NMI = 0x4
};

struct STimings
{
	int32	H_Max_Master;
	int32	H_Max;
	int32	V_Max_Master;
	int32	V_Max;
	int32	HBlankStart;
	int32	HBlankEnd;
	int32	HDMAInit;
	int32	HDMAStart;
	int32	NMITriggerPos;
	int32	NextIRQTimer;
	int32	IRQTriggerCycles;
	int32	WRAMRefreshPos;
	int32	RenderPos;
	bool8	InterlaceField;
	int32	DMACPUSync;		// The cycles to synchronize DMA and CPU. Snes9x cannot emulate correctly.
	int32	NMIDMADelay;	// The delay of NMI trigger after DMA transfers. Snes9x cannot emulate correctly.
	int32	IRQFlagChanging;	// This value is just a hack.
	int32	APUSpeedup;
	bool8	APUAllowTimeOverflow;
};

struct SSettings
{
	bool8	TraceDMA;
	bool8	TraceHDMA;
	bool8	TraceVRAM;
	bool8	TraceUnknownRegisters;
	bool8	TraceDSP;
	bool8	TraceHCEvent;
	bool8	TraceSMP;

	bool8	SuperFX;
	uint8	DSP;
	bool8	SA1;
	bool8	C4;
	bool8	SDD1;
	bool8	SPC7110;
	bool8	SPC7110RTC;
	bool8	OBC1;
	uint8	SETA;
	bool8	SRTC;
	bool8	BS;
	bool8	BSXItself;
	bool8	BSXBootup;
	bool8	MSU1;
	bool8	MouseMaster;
	bool8	SuperScopeMaster;
	bool8	JustifierMaster;
	bool8	MultiPlayer5Master;
	bool8	MacsRifleMaster;

	bool8	ForceLoROM;
	bool8	ForceHiROM;
	bool8	ForceHeader;
	bool8	ForceNoHeader;
	bool8	ForceInterleaved;
	bool8	ForceInterleaved2;
	bool8	ForceInterleaveGD24;
	bool8	ForceNotInterleaved;
	bool8	ForcePAL;
	bool8	ForceNTSC;
	bool8	PAL;
	uint32	FrameTimePAL;
	uint32	FrameTimeNTSC;
	uint32	FrameTime;

	bool8	Stereo;
	bool8	ReverseStereo;
	bool8	Mute;
	/* The frontend has stated it will never need this frame's audio and that
	   the state left behind will be discarded or restored. The DSP declines to
	   run at all while this is set - see SPC_DSP::run. Distinct from Mute,
	   which only says the output is not wanted. */
	bool8	HardDisableAudio;
	int32	InterpolationMethod;

	bool8	Transparency;
	int32	Mode7Hires;				// 0 off, 2 = 2x, 4 = 4x Mode 7 hires
	int32	Mode7HiresVertical;		// 2x vertical resample post-pass
	int32	Mode7HiresBilinear;		// 0 nearest, 1 stable, 2 smooth
	uint8	BG_Forced;
	uint16  ForcedBackdrop;

	uint32	InitialInfoStringTimeout;
	uint16	DisplayColor;
	bool8	BilinearFilter;
	bool	ShowOverscan;

	bool8	Multi;
	char	CartAName[PATH_MAX + 1];
	char	CartBName[PATH_MAX + 1];

	bool8	DisableGameSpecificHacks;
	bool8	BlockInvalidVRAMAccessMaster;
	bool8	BlockInvalidVRAMAccess;
	int32	HDMATimingHack;

	uint32	SkipFrames;
	uint32	TurboSkipFrames;
	uint32	AutoMaxSkipFrames;
	bool8	TurboMode;
	uint32	HighSpeedSeek;

	bool8	DumpStreams;
	int		DumpStreamsMaxFrames;

	char    InitialSnapshotFilename[PATH_MAX + 1];
	bool8	FastSavestates;

	bool8	ApplyCheats;
	bool8	NoPatch;
	bool8	IgnorePatchChecksum;
	bool8	IsPatched;
	int32	AutoSaveDelay;
	bool8	DontSaveOopsSnapshot;
	bool8	UpAndDown;

    bool8   SeparateEchoBuffer;
	uint32	SuperFXClockMultiplier;
    int OverclockMode;
	int	OneClockCycle;
	int	OneSlowClockCycle;
	int	TwoClockCycles;
	int	MaxSpriteTilesPerLine;
	int	ChannelsVolumePercent[9];
};

struct SSNESGameFixes
{
	uint8	SRAMInitialValue;
	uint8	Uniracers;
};

void S9xMessage(int, int, const char *);

extern struct SSettings			Settings;
extern struct SCPUState			CPU;
extern struct STimings			Timings;
extern struct SSNESGameFixes	SNESGameFixes;
extern char						String[513];

#endif
