SDLPAL/adplug/fmopl.h

#ifndef __FMOPL_H_
#define __FMOPL_H_

#ifdef _MSC_VER
#pragma warning (disable:4018)
#pragma warning (disable:4244)
#pragma warning (disable:4996)
#endif

/* --- select emulation chips --- */
#define BUILD_YM3812 (HAS_YM3812)
//#define BUILD_YM3526 (HAS_YM3526)
//#define BUILD_Y8950  (HAS_Y8950)

/* --- system optimize --- */
/* select bit size of output : 8 or 16 */
#define OPL_OUTPUT_BIT 16

/* compiler dependence */
#ifndef OSD_CPU_H
#define OSD_CPU_H
typedef unsigned char	UINT8;   /* unsigned  8bit */
typedef unsigned short	UINT16;  /* unsigned 16bit */
typedef unsigned int	UINT32;  /* unsigned 32bit */
typedef signed char		INT8;    /* signed  8bit   */
typedef signed short	INT16;   /* signed 16bit   */
typedef signed int		INT32;   /* signed 32bit   */
#endif

#if (OPL_OUTPUT_BIT==16)
typedef INT16 OPLSAMPLE;
#endif
#if (OPL_OUTPUT_BIT==8)
typedef unsigned char  OPLSAMPLE;
#endif


#if BUILD_Y8950
#include "ymdeltat.h"
#endif

typedef void (*OPL_TIMERHANDLER)(int channel,double interval_Sec);
typedef void (*OPL_IRQHANDLER)(int param,int irq);
typedef void (*OPL_UPDATEHANDLER)(int param,int min_interval_us);
typedef void (*OPL_PORTHANDLER_W)(int param,unsigned char data);
typedef unsigned char (*OPL_PORTHANDLER_R)(int param);

/* !!!!! here is private section , do not access there member direct !!!!! */

#define OPL_TYPE_WAVESEL   0x01  /* waveform select    */
#define OPL_TYPE_ADPCM     0x02  /* DELTA-T ADPCM unit */
#define OPL_TYPE_KEYBOARD  0x04  /* keyboard interface */
#define OPL_TYPE_IO        0x08  /* I/O port */

/* Saving is necessary for member of the 'R' mark for suspend/resume */
/* ---------- OPL one of slot  ---------- */
typedef struct fm_opl_slot {
   INT32 TL;		/* total level     :TL << 8            */
   INT32 TLL;		/* adjusted now TL                     */
   UINT8  KSR;		/* key scale rate  :(shift down bit)   */
   INT32 *AR;		/* attack rate     :&AR_TABLE[AR<<2]   */
   INT32 *DR;		/* decay rate      :&DR_TALBE[DR<<2]   */
   INT32 SL;		/* sustin level    :SL_TALBE[SL]       */
   INT32 *RR;		/* release rate    :&DR_TABLE[RR<<2]   */
   UINT8 ksl;		/* keyscale level  :(shift down bits)  */
   UINT8 ksr;		/* key scale rate  :kcode>>KSR         */
   UINT32 mul;		/* multiple        :ML_TABLE[ML]       */
   UINT32 Cnt;		/* frequency count :                   */
   UINT32 Incr;	/* frequency step  :                   */
   /* envelope generator state */
   UINT8 eg_typ;	/* envelope type flag                  */
   UINT8 evm;		/* envelope phase                      */
   INT32 evc;		/* envelope counter                    */
   INT32 eve;		/* envelope counter end point          */
   INT32 evs;		/* envelope counter step               */
   INT32 evsa;	/* envelope step for AR :AR[ksr]           */
   INT32 evsd;	/* envelope step for DR :DR[ksr]           */
   INT32 evsr;	/* envelope step for RR :RR[ksr]           */
   /* LFO */
   UINT8 ams;		/* ams flag                            */
   UINT8 vib;		/* vibrate flag                        */
   /* wave selector */
   INT32 **wavetable;
}OPL_SLOT;

/* ---------- OPL one of channel  ---------- */
typedef struct fm_opl_channel {
   OPL_SLOT SLOT[2];
   UINT8 CON;			/* connection type                     */
   UINT8 FB;			/* feed back       :(shift down bit)   */
   INT32 *connect1;	/* slot1 output pointer                */
   INT32 *connect2;	/* slot2 output pointer                */
   INT32 op1_out[2];	/* slot1 output for selfeedback        */
   /* phase generator state */
   UINT32  block_fnum;	/* block+fnum      :                   */
   UINT8 kcode;		/* key code        : KeyScaleCode      */
   UINT32  fc;			/* Freq. Increment base                */
   UINT32  ksl_base;	/* KeyScaleLevel Base step             */
   UINT8 keyon;		/* key on/off flag                     */
} OPL_CH;

/* OPL state */
typedef struct fm_opl_f {
   UINT8 type;			/* chip type                         */
   int clock;			/* master clock  (Hz)                */
   int rate;			/* sampling rate (Hz)                */
   double freqbase;	/* frequency base                    */
   double TimerBase;	/* Timer base time (==sampling time) */
   UINT8 address;		/* address register                  */
   UINT8 status;		/* status flag                       */
   UINT8 statusmask;	/* status mask                       */
   UINT32 mode;		/* Reg.08 : CSM , notesel,etc.       */
   /* Timer */
   int T[2];			/* timer counter                     */
   UINT8 st[2];		/* timer enable                      */
   /* FM channel slots */
   OPL_CH *P_CH;		/* pointer of CH                     */
   int	max_ch;			/* maximum channel                   */
   /* Rythm sention */
   UINT8 rythm;		/* Rythm mode , key flag */
#if BUILD_Y8950
   /* Delta-T ADPCM unit (Y8950) */
   YM_DELTAT *deltat;			/* DELTA-T ADPCM       */
#endif
   /* Keyboard / I/O interface unit (Y8950) */
   UINT8 portDirection;
   UINT8 portLatch;
   OPL_PORTHANDLER_R porthandler_r;
   OPL_PORTHANDLER_W porthandler_w;
   int port_param;
   OPL_PORTHANDLER_R keyboardhandler_r;
   OPL_PORTHANDLER_W keyboardhandler_w;
   int keyboard_param;
   /* time tables */
   INT32 AR_TABLE[75];	/* atttack rate tables */
   INT32 DR_TABLE[75];	/* decay rate tables   */
   UINT32 FN_TABLE[1024];  /* fnumber -> increment counter */
   /* LFO */
   INT32 *ams_table;
   INT32 *vib_table;
   INT32 amsCnt;
   INT32 amsIncr;
   INT32 vibCnt;
   INT32 vibIncr;
   /* wave selector enable flag */
   UINT8 wavesel;
   /* external event callback handler */
   OPL_TIMERHANDLER  TimerHandler;		/* TIMER handler   */
   int TimerParam;						/* TIMER parameter */
   OPL_IRQHANDLER    IRQHandler;		/* IRQ handler    */
   int IRQParam;						/* IRQ parameter  */
   OPL_UPDATEHANDLER UpdateHandler;	/* stream update handler   */
   int UpdateParam;					/* stream update parameter */
} FM_OPL;

/* ---------- Generic interface section ---------- */
#define OPL_TYPE_YM3526 (0)
#define OPL_TYPE_YM3812 (OPL_TYPE_WAVESEL)
#define OPL_TYPE_Y8950  (OPL_TYPE_ADPCM|OPL_TYPE_KEYBOARD|OPL_TYPE_IO)

FM_OPL *OPLCreate(int type, int clock, int rate);
void OPLDestroy(FM_OPL *OPL);
void OPLSetTimerHandler(FM_OPL *OPL,OPL_TIMERHANDLER TimerHandler,int channelOffset);
void OPLSetIRQHandler(FM_OPL *OPL,OPL_IRQHANDLER IRQHandler,int param);
void OPLSetUpdateHandler(FM_OPL *OPL,OPL_UPDATEHANDLER UpdateHandler,int param);
/* Y8950 port handlers */
void OPLSetPortHandler(FM_OPL *OPL,OPL_PORTHANDLER_W PortHandler_w,OPL_PORTHANDLER_R PortHandler_r,int param);
void OPLSetKeyboardHandler(FM_OPL *OPL,OPL_PORTHANDLER_W KeyboardHandler_w,OPL_PORTHANDLER_R KeyboardHandler_r,int param);

void OPLResetChip(FM_OPL *OPL);
int OPLWrite(FM_OPL *OPL,int a,int v);
unsigned char OPLRead(FM_OPL *OPL,int a);
int OPLTimerOver(FM_OPL *OPL,int c);

/* YM3626/YM3812 local section */
void YM3812UpdateOne(FM_OPL *OPL, INT16 *buffer, int length);

void Y8950UpdateOne(FM_OPL *OPL, INT16 *buffer, int length);

#endif