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/*

**

** File: fmopl.c -- software implementation of FM sound generator

**

** Copyright (C) 1999,2000 Tatsuyuki Satoh , MultiArcadeMachineEmurator development

**

** Version 0.37a

**

*/

/*

        preliminary :

        Problem :

        note:

*/

/* This version of fmopl.c is a fork of the MAME one, relicensed under the LGPL.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#define INLINE                static inline

#define HAS_YM3812        1

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <stdarg.h>

#include <math.h>

//#include "driver.h"                /* use M.A.M.E. */

#include "fmopl.h"

#ifndef PI

#define PI 3.14159265358979323846

#endif

/* -------------------- for debug --------------------- */

/* #define OPL_OUTPUT_LOG */

#ifdef OPL_OUTPUT_LOG

static FILE *opl_dbg_fp = NULL;

static FM_OPL *opl_dbg_opl[16];

static int opl_dbg_maxchip,opl_dbg_chip;

#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 */

/* table is 3dB/OCT , DV converts this in TL step at 6dB/OCT */

#define DV (EG_STEP/2)

static const UINT32 KSL_TABLE[8*16]=

{

        /* OCT 0 */

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

        /* OCT 1 */

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 0.750/DV, 1.125/DV, 1.500/DV,

         1.875/DV, 2.250/DV, 2.625/DV, 3.000/DV,

        /* OCT 2 */

         0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,

         0.000/DV, 1.125/DV, 1.875/DV, 2.625/DV,

         3.000/DV, 3.750/DV, 4.125/DV, 4.500/DV,

         4.875/DV, 5.250/DV, 5.625/DV, 6.000/DV,

        /* OCT 3 */

         0.000/DV, 0.000/DV, 0.000/DV, 1.875/DV,

         3.000/DV, 4.125/DV, 4.875/DV, 5.625/DV,

         6.000/DV, 6.750/DV, 7.125/DV, 7.500/DV,

         7.875/DV, 8.250/DV, 8.625/DV, 9.000/DV,

        /* OCT 4 */

         0.000/DV, 0.000/DV, 3.000/DV, 4.875/DV,

         6.000/DV, 7.125/DV, 7.875/DV, 8.625/DV,

         9.000/DV, 9.750/DV,10.125/DV,10.500/DV,

        10.875/DV,11.250/DV,11.625/DV,12.000/DV,

        /* OCT 5 */

         0.000/DV, 3.000/DV, 6.000/DV, 7.875/DV,

         9.000/DV,10.125/DV,10.875/DV,11.625/DV,

        12.000/DV,12.750/DV,13.125/DV,13.500/DV,

        13.875/DV,14.250/DV,14.625/DV,15.000/DV,

        /* OCT 6 */

         0.000/DV, 6.000/DV, 9.000/DV,10.875/DV,

        12.000/DV,13.125/DV,13.875/DV,14.625/DV,

        15.000/DV,15.750/DV,16.125/DV,16.500/DV,

        16.875/DV,17.250/DV,17.625/DV,18.000/DV,

        /* OCT 7 */

         0.000/DV, 9.000/DV,12.000/DV,13.875/DV,

        15.000/DV,16.125/DV,16.875/DV,17.625/DV,

        18.000/DV,18.750/DV,19.125/DV,19.500/DV,

        19.875/DV,20.250/DV,20.625/DV,21.000/DV

};

#undef DV

/* 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 OPLSAMPLE  *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

#define LOG_LEVEL        LOG_ERR

//#define LOG(n,x) if( (n)>=LOG_LEVEL ) logerror x

#define LOG(n,x)

/* --------------------- subroutines  --------------------- */

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 */

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 */

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 */

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  ----- */

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 ----- */

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 */

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 ---------- */

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 */

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 */

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  */

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 */

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 ---------- */

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;

                        CH->op1_out[1] = CH->op1_out[0];

                        *CH->connect1 += CH->op1_out[0] = OP_OUT(SLOT,env_out,feedback1);

                }

                else

                {

                        *CH->connect1 += OP_OUT(SLOT,env_out,0);

                }

        }else

        {

                CH->op1_out[1] = CH->op1_out[0];

                CH->op1_out[0] = 0;

        }

        /* SLOT 2 */

        SLOT = &CH->SLOT[SLOT2];

        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 */

                outd[0] += OP_OUT(SLOT,env_out, feedback2);

        }

}

/* ---------- calcrate rythm block ---------- */

#define WHITE_NOISE_db 6.0

INLINE void OPL_CALC_RH( OPL_CH *CH )

{

        UINT32 env_tam,env_sd,env_top,env_hh;

        int whitenoise = (rand()&1)*(WHITE_NOISE_db/EG_STEP);

        INT32 tone8;

        OPL_SLOT *SLOT;

        int env_out;

        /* BD : same as FM serial mode and output level is large */

        feedback2 = 0;

        /* SLOT 1 */

        SLOT = &CH[6].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[6].FB)

                {

                        int feedback1 = (CH[6].op1_out[0]+CH[6].op1_out[1])>>CH[6].FB;

                        CH[6].op1_out[1] = CH[6].op1_out[0];

                        feedback2 = CH[6].op1_out[0] = OP_OUT(SLOT,env_out,feedback1);

                }

                else

                {

                        feedback2 = OP_OUT(SLOT,env_out,0);

                }

        }else

        {

                feedback2 = 0;

                CH[6].op1_out[1] = CH[6].op1_out[0];

                CH[6].op1_out[0] = 0;

        }

        /* SLOT 2 */

        SLOT = &CH[6].SLOT[SLOT2];

        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 */

                outd[0] += OP_OUT(SLOT,env_out, feedback2)*2;

        }

        // SD  (17) = mul14[fnum7] + white noise

        // TAM (15) = mul15[fnum8]

        // TOP (18) = fnum6(mul18[fnum8]+whitenoise)

        // HH  (14) = fnum7(mul18[fnum8]+whitenoise) + white noise

        env_sd =OPL_CALC_SLOT(SLOT7_2) + whitenoise;

        env_tam=OPL_CALC_SLOT(SLOT8_1);

        env_top=OPL_CALC_SLOT(SLOT8_2);

        env_hh =OPL_CALC_SLOT(SLOT7_1) + whitenoise;

        /* PG */

        if(SLOT7_1->vib) SLOT7_1->Cnt += (2*SLOT7_1->Incr*vib/VIB_RATE);

        else             SLOT7_1->Cnt += 2*SLOT7_1->Incr;

        if(SLOT7_2->vib) SLOT7_2->Cnt += ((CH[7].fc*8)*vib/VIB_RATE);

        else             SLOT7_2->Cnt += (CH[7].fc*8);

        if(SLOT8_1->vib) SLOT8_1->Cnt += (SLOT8_1->Incr*vib/VIB_RATE);

        else             SLOT8_1->Cnt += SLOT8_1->Incr;

        if(SLOT8_2->vib) SLOT8_2->Cnt += ((CH[8].fc*48)*vib/VIB_RATE);

        else             SLOT8_2->Cnt += (CH[8].fc*48);

        tone8 = OP_OUT(SLOT8_2,whitenoise,0 );

        /* SD */

        if( env_sd < EG_ENT-1 )

                outd[0] += OP_OUT(SLOT7_1,env_sd, 0)*8;

        /* TAM */

        if( env_tam < EG_ENT-1 )

                outd[0] += OP_OUT(SLOT8_1,env_tam, 0)*2;

        /* TOP-CY */

        if( env_top < EG_ENT-1 )

                outd[0] += OP_OUT(SLOT7_2,env_top,tone8)*2;

        /* HH */

        if( env_hh  < EG_ENT-1 )

                outd[0] += OP_OUT(SLOT7_2,env_hh,tone8)*2;

}

/* ----------- initialize time tabls ----------- */

static void init_timetables( FM_OPL *OPL , int ARRATE , int DRRATE )

{

        int i;

        double rate;

        /* make attack rate & decay rate tables */

        for (i = 0;i < 4;i++) OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0;

        for (i = 4;i <= 60;i++){

                rate  = OPL->freqbase;                                                /* frequency rate */

                if( i < 60 ) rate *= 1.0+(i&3)*0.25;                /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */

                rate *= 1<<((i>>2)-1);                                                /* b2-5 : shift bit */

                rate *= (double)(EG_ENT<<ENV_BITS);

                OPL->AR_TABLE[i] = rate / ARRATE;

                OPL->DR_TABLE[i] = rate / DRRATE;

        }

        for (i = 60;i < 76;i++)

        {

                OPL->AR_TABLE[i] = EG_AED-1;

                OPL->DR_TABLE[i] = OPL->DR_TABLE[60];

        }

#if 0

        for (i = 0;i < 64 ;i++){        /* make for overflow area */

                LOG(LOG_WAR,("rate %2d , ar %f ms , dr %f ms \n",i,

                        ((double)(EG_ENT<<ENV_BITS) / OPL->AR_TABLE[i]) * (1000.0 / OPL->rate),

                        ((double)(EG_ENT<<ENV_BITS) / OPL->DR_TABLE[i]) * (1000.0 / OPL->rate) ));

        }

#endif

}

/* ---------- generic table initialize ---------- */

static int OPLOpenTable( void )

{

        int s,t;

        double rate;

        int i,j;

        double pom;

        /* allocate dynamic tables */

        if( (TL_TABLE = malloc(TL_MAX*2*sizeof(INT32))) == NULL)

                return 0;

        if( (SIN_TABLE = malloc(SIN_ENT*4 *sizeof(INT32 *))) == NULL)

        {

                free(TL_TABLE);

                return 0;

        }

        if( (AMS_TABLE = malloc(AMS_ENT*2 *sizeof(INT32))) == NULL)

        {

                free(TL_TABLE);

                free(SIN_TABLE);

                return 0;

        }

        if( (VIB_TABLE = malloc(VIB_ENT*2 *sizeof(INT32))) == NULL)

        {

                free(TL_TABLE);

                free(SIN_TABLE);

                free(AMS_TABLE);

                return 0;

        }

        /* make total level table */

        for (t = 0;t < EG_ENT-1 ;t++){

                rate = ((1<<TL_BITS)-1)/pow(10,EG_STEP*t/20);        /* dB -> voltage */

                TL_TABLE[       t] =  (int)rate;

                TL_TABLE[TL_MAX+t] = -TL_TABLE[t];

/*                LOG(LOG_INF,("TotalLevel(%3d) = %x\n",t,TL_TABLE[t]));*/

        }

        /* fill volume off area */

        for ( t = EG_ENT-1; t < TL_MAX ;t++){

                TL_TABLE[t] = TL_TABLE[TL_MAX+t] = 0;

        }

        /* make sinwave table (total level offet) */

        /* degree 0 = degree 180                   = off */

        SIN_TABLE[0] = SIN_TABLE[SIN_ENT/2]         = &TL_TABLE[EG_ENT-1];

        for (s = 1;s <= SIN_ENT/4;s++){

                pom = sin(2*PI*s/SIN_ENT); /* sin     */

                pom = 20*log10(1/pom);           /* decibel */

                j = pom / EG_STEP;         /* TL_TABLE steps */

        /* degree 0   -  90    , degree 180 -  90 : plus section */

                SIN_TABLE[          s] = SIN_TABLE[SIN_ENT/2-s] = &TL_TABLE[j];

        /* degree 180 - 270    , degree 360 - 270 : minus section */

                SIN_TABLE[SIN_ENT/2+s] = SIN_TABLE[SIN_ENT  -s] = &TL_TABLE[TL_MAX+j];

/*                LOG(LOG_INF,("sin(%3d) = %f:%f db\n",s,pom,(double)j * EG_STEP));*/

        }

        for (s = 0;s < SIN_ENT;s++)

        {

                SIN_TABLE[SIN_ENT*1+s] = s<(SIN_ENT/2) ? SIN_TABLE[s] : &TL_TABLE[EG_ENT];

                SIN_TABLE[SIN_ENT*2+s] = SIN_TABLE[s % (SIN_ENT/2)];

                SIN_TABLE[SIN_ENT*3+s] = (s/(SIN_ENT/4))&1 ? &TL_TABLE[EG_ENT] : SIN_TABLE[SIN_ENT*2+s];

        }

        /* envelope counter -> envelope output table */

        for (i=0; i<EG_ENT; i++)

        {

                /* ATTACK curve */

                pom = pow( ((double)(EG_ENT-1-i)/EG_ENT) , 8 ) * EG_ENT;

                /* if( pom >= EG_ENT ) pom = EG_ENT-1; */

                ENV_CURVE[i] = (int)pom;

                /* DECAY ,RELEASE curve */

                ENV_CURVE[(EG_DST>>ENV_BITS)+i]= i;

        }

        /* off */

        ENV_CURVE[EG_OFF>>ENV_BITS]= EG_ENT-1;

        /* make LFO ams table */

        for (i=0; i<AMS_ENT; i++)

        {

                pom = (1.0+sin(2*PI*i/AMS_ENT))/2; /* sin */

                AMS_TABLE[i]         = (1.0/EG_STEP)*pom; /* 1dB   */

                AMS_TABLE[AMS_ENT+i] = (4.8/EG_STEP)*pom; /* 4.8dB */

        }

        /* make LFO vibrate table */

        for (i=0; i<VIB_ENT; i++)

        {

                /* 100cent = 1seminote = 6% ?? */

                pom = (double)VIB_RATE*0.06*sin(2*PI*i/VIB_ENT); /* +-100sect step */

                VIB_TABLE[i]         = VIB_RATE + (pom*0.07); /* +- 7cent */

                VIB_TABLE[VIB_ENT+i] = VIB_RATE + (pom*0.14); /* +-14cent */

                /* LOG(LOG_INF,("vib %d=%d\n",i,VIB_TABLE[VIB_ENT+i])); */

        }

        return 1;

}

static void OPLCloseTable( void )

{

        free(TL_TABLE);

        free(SIN_TABLE);

        free(AMS_TABLE);

        free(VIB_TABLE);

}

/* CSM Key Controll */

INLINE void CSMKeyControll(OPL_CH *CH)

{

        OPL_SLOT *slot1 = &CH->SLOT[SLOT1];

        OPL_SLOT *slot2 = &CH->SLOT[SLOT2];

        /* all key off */

        OPL_KEYOFF(slot1);

        OPL_KEYOFF(slot2);

        /* total level latch */

        slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);

        slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);

        /* key on */

        CH->op1_out[0] = CH->op1_out[1] = 0;

        OPL_KEYON(slot1);

        OPL_KEYON(slot2);

}

/* ---------- opl initialize ---------- */

static void OPL_initalize(FM_OPL *OPL)

{

        int fn;

        /* frequency base */

        OPL->freqbase = (OPL->rate) ? ((double)OPL->clock / OPL->rate) / 72  : 0;

        /* Timer base time */

        OPL->TimerBase = 1.0/((double)OPL->clock / 72.0 );

        /* make time tables */

        init_timetables( OPL , OPL_ARRATE , OPL_DRRATE );

        /* make fnumber -> increment counter table */

        for( fn=0 ; fn < 1024 ; fn++ )

        {

                OPL->FN_TABLE[fn] = OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2;

        }

        /* LFO freq.table */

        OPL->amsIncr = OPL->rate ? (double)AMS_ENT*(1<<AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0;

        OPL->vibIncr = OPL->rate ? (double)VIB_ENT*(1<<VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0;

}

/* ---------- write a OPL registers ---------- */

static void OPLWriteReg(FM_OPL *OPL, int r, int v)

{

        OPL_CH *CH;

        int slot;

        int block_fnum;

        switch(r&0xe0)

        {

        case 0x00: /* 00-1f:controll */

                switch(r&0x1f)

                {

                case 0x01:

                        /* wave selector enable */

                        if(OPL->type&OPL_TYPE_WAVESEL)

                        {

                                OPL->wavesel = v&0x20;

                                if(!OPL->wavesel)

                                {

                                        /* preset compatible mode */

                                        int c;

                                        for(c=0;c<OPL->max_ch;c++)

                                        {

                                                OPL->P_CH[c].SLOT[SLOT1].wavetable = &SIN_TABLE[0];

                                                OPL->P_CH[c].SLOT[SLOT2].wavetable = &SIN_TABLE[0];

                                        }

                                }

                        }

                        return;

                case 0x02:        /* Timer 1 */

                        OPL->T[0] = (256-v)*4;

                        break;

                case 0x03:        /* Timer 2 */

                        OPL->T[1] = (256-v)*16;

                        return;

                case 0x04:        /* IRQ clear / mask and Timer enable */

                        if(v&0x80)

                        {        /* IRQ flag clear */

                                OPL_STATUS_RESET(OPL,0x7f);

                        }

                        else

                        {        /* set IRQ mask ,timer enable*/

                                UINT8 st1 = v&1;

                                UINT8 st2 = (v>>1)&1;

                                /* IRQRST,T1MSK,t2MSK,EOSMSK,BRMSK,x,ST2,ST1 */

                                OPL_STATUS_RESET(OPL,v&0x78);

                                OPL_STATUSMASK_SET(OPL,((~v)&0x78)|0x01);

                                /* timer 2 */

                                if(OPL->st[1] != st2)

                                {

                                        double interval = st2 ? (double)OPL->T[1]*OPL->TimerBase : 0.0;

                                        OPL->st[1] = st2;

                                        if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+1,interval);

                                }

                                /* timer 1 */

                                if(OPL->st[0] != st1)

                                {

                                        double interval = st1 ? (double)OPL->T[0]*OPL->TimerBase : 0.0;

                                        OPL->st[0] = st1;

                                        if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+0,interval);

                                }

                        }

                        return;

#if BUILD_Y8950

                case 0x06:                /* Key Board OUT */

                        if(OPL->type&OPL_TYPE_KEYBOARD)

                        {

                                if(OPL->keyboardhandler_w)

                                        OPL->keyboardhandler_w(OPL->keyboard_param,v);

                                else

                                        LOG(LOG_WAR,("OPL:write unmapped KEYBOARD port\n"));

                        }

                        return;

                case 0x07:        /* DELTA-T controll : START,REC,MEMDATA,REPT,SPOFF,x,x,RST */

                        if(OPL->type&OPL_TYPE_ADPCM)

                                YM_DELTAT_ADPCM_Write(OPL->deltat,r-0x07,v);

                        return;

                case 0x08:        /* MODE,DELTA-T : CSM,NOTESEL,x,x,smpl,da/ad,64k,rom */

                        OPL->mode = v;

                        v&=0x1f;        /* for DELTA-T unit */

                case 0x09:                /* START ADD */

                case 0x0a:

                case 0x0b:                /* STOP ADD  */

                case 0x0c: