?? fmopl.c.bak
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/*
**
** File: fmopl.c -- software implementation of FM sound generator
**
** Copyright (C) 1999 Tatsuyuki Satoh , MultiArcadeMachineEmurator development
**
** Version 0.36f
**
*/
#define BUILD_YM3812 1
/*
preliminary :
Problem :
note:
*/
#include "shared.h"
#ifndef PI
#define PI 3.14159265358979323846
#endif
/* -------------------- preliminary define section --------------------- */
/* attack/decay rate time rate */
#define OPL_ARRATE 141280 /* RATE 4 = 2826.24ms @ 3.6MHz */
#define OPL_DRRATE 1956000 /* RATE 4 = 39280.64ms @ 3.6MHz */
#define DELTAT_MIXING_LEVEL (1) /* DELTA-T ADPCM MIXING LEVEL */
#define FREQ_BITS 24 /* frequency turn */
/* counter bits = 20 , octerve 7 */
#define FREQ_RATE (1<<(FREQ_BITS-20))
#define TL_BITS (FREQ_BITS+2)
/* final output shift , limit minimum and maximum */
#define OPL_OUTSB (TL_BITS+3-16) /* OPL output final shift 16bit */
#define OPL_MAXOUT (0x7fff<<OPL_OUTSB)
#define OPL_MINOUT (-0x8000<<OPL_OUTSB)
/* -------------------- quality selection --------------------- */
/* sinwave entries */
/* used static memory = SIN_ENT * 4 (byte) */
#define SIN_ENT 2048
/* output level entries (envelope,sinwave) */
/* envelope counter lower bits */
#define ENV_BITS 16
/* envelope output entries */
#define EG_ENT 4096
/* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */
/* used static memory = EG_ENT*4 (byte) */
#define EG_OFF ((2*EG_ENT)<<ENV_BITS) /* OFF */
#define EG_DED EG_OFF
#define EG_DST (EG_ENT<<ENV_BITS) /* DECAY START */
#define EG_AED EG_DST
#define EG_AST 0 /* ATTACK START */
#define EG_STEP (96.0/EG_ENT) /* OPL is 0.1875 dB step */
/* LFO table entries */
#define VIB_ENT 512
#define VIB_SHIFT (32-9)
#define AMS_ENT 512
#define AMS_SHIFT (32-9)
#define VIB_RATE 256
/* -------------------- local defines , macros --------------------- */
/* register number to channel number , slot offset */
#define SLOT1 0
#define SLOT2 1
/* envelope phase */
#define ENV_MOD_RR 0x00
#define ENV_MOD_DR 0x01
#define ENV_MOD_AR 0x02
/* -------------------- tables --------------------- */
static const int slot_array[32]=
{
0, 2, 4, 1, 3, 5,-1,-1,
6, 8,10, 7, 9,11,-1,-1,
12,14,16,13,15,17,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1
};
/* key scale level */
#define ML (0.1875*2/EG_STEP)
static const UINT32 KSL_TABLE[8*16]=
{
/* OCT 0 */
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
/* OCT 1 */
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 0.750*ML, 1.125*ML, 1.500*ML,
1.875*ML, 2.250*ML, 2.625*ML, 3.000*ML,
/* OCT 2 */
0.000*ML, 0.000*ML, 0.000*ML, 0.000*ML,
0.000*ML, 1.125*ML, 1.875*ML, 2.625*ML,
3.000*ML, 3.750*ML, 4.125*ML, 4.500*ML,
4.875*ML, 5.250*ML, 5.625*ML, 6.000*ML,
/* OCT 3 */
0.000*ML, 0.000*ML, 0.000*ML, 1.875*ML,
3.000*ML, 4.125*ML, 4.875*ML, 5.625*ML,
6.000*ML, 6.750*ML, 7.125*ML, 7.500*ML,
7.875*ML, 8.250*ML, 8.625*ML, 9.000*ML,
/* OCT 4 */
0.000*ML, 0.000*ML, 3.000*ML, 4.875*ML,
6.000*ML, 7.125*ML, 7.875*ML, 8.625*ML,
9.000*ML, 9.750*ML,10.125*ML,10.500*ML,
10.875*ML,11.250*ML,11.625*ML,12.000*ML,
/* OCT 5 */
0.000*ML, 3.000*ML, 6.000*ML, 7.875*ML,
9.000*ML,10.125*ML,10.875*ML,11.625*ML,
12.000*ML,12.750*ML,13.125*ML,13.500*ML,
13.875*ML,14.250*ML,14.625*ML,15.000*ML,
/* OCT 6 */
0.000*ML, 6.000*ML, 9.000*ML,10.875*ML,
12.000*ML,13.125*ML,13.875*ML,14.625*ML,
15.000*ML,15.750*ML,16.125*ML,16.500*ML,
16.875*ML,17.250*ML,17.625*ML,18.000*ML,
/* OCT 7 */
0.000*ML, 9.000*ML,12.000*ML,13.875*ML,
15.000*ML,16.125*ML,16.875*ML,17.625*ML,
18.000*ML,18.750*ML,19.125*ML,19.500*ML,
19.875*ML,20.250*ML,20.625*ML,21.000*ML
};
#undef ML
/* sustain lebel table (3db per step) */
/* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
#define SC(db) (db*((3/EG_STEP)*(1<<ENV_BITS)))+EG_DST
static const INT32 SL_TABLE[16]={
SC( 0),SC( 1),SC( 2),SC(3 ),SC(4 ),SC(5 ),SC(6 ),SC( 7),
SC( 8),SC( 9),SC(10),SC(11),SC(12),SC(13),SC(14),SC(31)
};
#undef SC
#define TL_MAX (EG_ENT*2) /* limit(tl + ksr + envelope) + sinwave */
/* TotalLevel : 48 24 12 6 3 1.5 0.75 (dB) */
/* TL_TABLE[ 0 to TL_MAX ] : plus section */
/* TL_TABLE[ TL_MAX to TL_MAX+TL_MAX-1 ] : minus section */
static INT32 *TL_TABLE;
/* pointers to TL_TABLE with sinwave output offset */
static INT32 **SIN_TABLE;
/* LFO table */
static INT32 *AMS_TABLE;
static INT32 *VIB_TABLE;
/* envelope output curve table */
/* attack + decay + OFF */
static INT32 ENV_CURVE[2*EG_ENT+1];
/* multiple table */
#define ML 2
static const UINT32 MUL_TABLE[16]= {
/* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
0.50*ML, 1.00*ML, 2.00*ML, 3.00*ML, 4.00*ML, 5.00*ML, 6.00*ML, 7.00*ML,
8.00*ML, 9.00*ML,10.00*ML,10.00*ML,12.00*ML,12.00*ML,15.00*ML,15.00*ML
};
#undef ML
/* dummy attack / decay rate ( when rate == 0 ) */
static INT32 RATE_0[16]=
{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
/* -------------------- static state --------------------- */
/* lock level of common table */
static int num_lock = 0;
/* work table */
static void *cur_chip = NULL; /* current chip point */
/* currenct chip state */
/* static FMSAMPLE *bufL,*bufR; */
static OPL_CH *S_CH;
static OPL_CH *E_CH;
OPL_SLOT *SLOT7_1,*SLOT7_2,*SLOT8_1,*SLOT8_2;
static INT32 outd[1];
static INT32 ams;
static INT32 vib;
INT32 *ams_table;
INT32 *vib_table;
static INT32 amsIncr;
static INT32 vibIncr;
static INT32 feedback2; /* connect for SLOT 2 */
/* log output level */
#define LOG_ERR 3 /* ERROR */
#define LOG_WAR 2 /* WARNING */
#define LOG_INF 1 /* INFORMATION */
#define LOG_LEVEL LOG_INF
static void Log(int level,char *format,...)
{
}
/* --------------------- subroutines --------------------- */
static __inline__ int Limit( int val, int max, int min ) {
if ( val > max )
val = max;
else if ( val < min )
val = min;
return val;
}
/* status set and IRQ handling */
static __inline__ void OPL_STATUS_SET(FM_OPL *OPL,int flag)
{
/* set status flag */
OPL->status |= flag;
if(!(OPL->status & 0x80))
{
if(OPL->status & OPL->statusmask)
{ /* IRQ on */
OPL->status |= 0x80;
/* callback user interrupt handler (IRQ is OFF to ON) */
if(OPL->IRQHandler) (OPL->IRQHandler)(OPL->IRQParam,1);
}
}
}
/* status reset and IRQ handling */
static __inline__ void OPL_STATUS_RESET(FM_OPL *OPL,int flag)
{
/* reset status flag */
OPL->status &=~flag;
if((OPL->status & 0x80))
{
if (!(OPL->status & OPL->statusmask) )
{
OPL->status &= 0x7f;
/* callback user interrupt handler (IRQ is ON to OFF) */
if(OPL->IRQHandler) (OPL->IRQHandler)(OPL->IRQParam,0);
}
}
}
/* IRQ mask set */
static __inline__ void OPL_STATUSMASK_SET(FM_OPL *OPL,int flag)
{
OPL->statusmask = flag;
/* IRQ handling check */
OPL_STATUS_SET(OPL,0);
OPL_STATUS_RESET(OPL,0);
}
/* ----- key on ----- */
static __inline__ void OPL_KEYON(OPL_SLOT *SLOT)
{
/* sin wave restart */
SLOT->Cnt = 0;
/* set attack */
SLOT->evm = ENV_MOD_AR;
SLOT->evs = SLOT->evsa;
SLOT->evc = EG_AST;
SLOT->eve = EG_AED;
}
/* ----- key off ----- */
static __inline__ void OPL_KEYOFF(OPL_SLOT *SLOT)
{
if( SLOT->evm > ENV_MOD_RR)
{
/* set envelope counter from envleope output */
SLOT->evm = ENV_MOD_RR;
if( !(SLOT->evc&EG_DST) )
//SLOT->evc = (ENV_CURVE[SLOT->evc>>ENV_BITS]<<ENV_BITS) + EG_DST;
SLOT->evc = EG_DST;
SLOT->eve = EG_DED;
SLOT->evs = SLOT->evsr;
}
}
/* ---------- calcrate Envelope Generator & Phase Generator ---------- */
/* return : envelope output */
static __inline__ UINT32 OPL_CALC_SLOT( OPL_SLOT *SLOT )
{
/* calcrate envelope generator */
if( (SLOT->evc+=SLOT->evs) >= SLOT->eve )
{
switch( SLOT->evm ){
case ENV_MOD_AR: /* ATTACK -> DECAY1 */
/* next DR */
SLOT->evm = ENV_MOD_DR;
SLOT->evc = EG_DST;
SLOT->eve = SLOT->SL;
SLOT->evs = SLOT->evsd;
break;
case ENV_MOD_DR: /* DECAY -> SL or RR */
SLOT->evc = SLOT->SL;
SLOT->eve = EG_DED;
if(SLOT->eg_typ)
{
SLOT->evs = 0;
}
else
{
SLOT->evm = ENV_MOD_RR;
SLOT->evs = SLOT->evsr;
}
break;
case ENV_MOD_RR: /* RR -> OFF */
SLOT->evc = EG_OFF;
SLOT->eve = EG_OFF+1;
SLOT->evs = 0;
break;
}
}
/* calcrate envelope */
return SLOT->TLL+ENV_CURVE[SLOT->evc>>ENV_BITS]+(SLOT->ams ? ams : 0);
}
/* set algorythm connection */
static void set_algorythm( OPL_CH *CH)
{
INT32 *carrier = &outd[0];
CH->connect1 = CH->CON ? carrier : &feedback2;
CH->connect2 = carrier;
}
/* ---------- frequency counter for operater update ---------- */
static __inline__ void CALC_FCSLOT(OPL_CH *CH,OPL_SLOT *SLOT)
{
int ksr;
/* frequency step counter */
SLOT->Incr = CH->fc * SLOT->mul;
ksr = CH->kcode >> SLOT->KSR;
if( SLOT->ksr != ksr )
{
SLOT->ksr = ksr;
/* attack , decay rate recalcration */
SLOT->evsa = SLOT->AR[ksr];
SLOT->evsd = SLOT->DR[ksr];
SLOT->evsr = SLOT->RR[ksr];
}
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
/* set multi,am,vib,EG-TYP,KSR,mul */
static __inline__ void set_mul(FM_OPL *OPL,int slot,int v)
{
OPL_CH *CH = &OPL->P_CH[slot/2];
OPL_SLOT *SLOT = &CH->SLOT[slot&1];
SLOT->mul = MUL_TABLE[v&0x0f];
SLOT->KSR = (v&0x10) ? 0 : 2;
SLOT->eg_typ = (v&0x20)>>5;
SLOT->vib = (v&0x40);
SLOT->ams = (v&0x80);
CALC_FCSLOT(CH,SLOT);
}
/* set ksl & tl */
static __inline__ void set_ksl_tl(FM_OPL *OPL,int slot,int v)
{
OPL_CH *CH = &OPL->P_CH[slot/2];
OPL_SLOT *SLOT = &CH->SLOT[slot&1];
int ksl = v>>6; /* 0 / 1.5 / 3 / 6 db/OCT */
SLOT->ksl = ksl ? 3-ksl : 31;
SLOT->TL = (v&0x3f)*(0.75/EG_STEP); /* 0.75db step */
if( !(OPL->mode&0x80) )
{ /* not CSM latch total level */
SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
}
}
/* set attack rate & decay rate */
static __inline__ void set_ar_dr(FM_OPL *OPL,int slot,int v)
{
OPL_CH *CH = &OPL->P_CH[slot/2];
OPL_SLOT *SLOT = &CH->SLOT[slot&1];
int ar = v>>4;
int dr = v&0x0f;
SLOT->AR = ar ? &OPL->AR_TABLE[ar<<2] : RATE_0;
SLOT->evsa = SLOT->AR[SLOT->ksr];
if( SLOT->evm == ENV_MOD_AR ) SLOT->evs = SLOT->evsa;
SLOT->DR = dr ? &OPL->DR_TABLE[dr<<2] : RATE_0;
SLOT->evsd = SLOT->DR[SLOT->ksr];
if( SLOT->evm == ENV_MOD_DR ) SLOT->evs = SLOT->evsd;
}
/* set sustain level & release rate */
static __inline__ void set_sl_rr(FM_OPL *OPL,int slot,int v)
{
OPL_CH *CH = &OPL->P_CH[slot/2];
OPL_SLOT *SLOT = &CH->SLOT[slot&1];
int sl = v>>4;
int rr = v & 0x0f;
SLOT->SL = SL_TABLE[sl];
if( SLOT->evm == ENV_MOD_DR ) SLOT->eve = SLOT->SL;
SLOT->RR = &OPL->DR_TABLE[rr<<2];
SLOT->evsr = SLOT->RR[SLOT->ksr];
if( SLOT->evm == ENV_MOD_RR ) SLOT->evs = SLOT->evsr;
}
/* operator output calcrator */
#define OP_OUT(slot,env,con) slot->wavetable[((slot->Cnt+con)/(0x1000000/SIN_ENT))&(SIN_ENT-1)][env]
/* ---------- calcrate one of channel ---------- */
static __inline__ void OPL_CALC_CH( OPL_CH *CH )
{
UINT32 env_out;
OPL_SLOT *SLOT;
feedback2 = 0;
/* SLOT 1 */
SLOT = &CH->SLOT[SLOT1];
env_out=OPL_CALC_SLOT(SLOT);
if( env_out < EG_ENT-1 )
{
/* PG */
if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
else SLOT->Cnt += SLOT->Incr;
/* connectoion */
if(CH->FB)
{
int feedback1 = (CH->op1_out[0]+CH->op1_out[1])>>CH->FB;
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