/*
**
** File: fmopl.c -- software implementation of FM sound generator
**
** Copyright (C) 1999 Tatsuyuki Satoh , MultiArcadeMachineEmurator development
**
** Version 0.36f
**
*/

/*
	preliminary :
	Problem :
	note:
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
/*#include "driver.h" */
/* use M.A.M.E. */
#include "fmopl.h"
#include <math.h>

/* MPC - hacks */
#include "types.h"
#include "log.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(x) ((UINT32)((x)*0.1875*2/EG_STEP))
static const UINT32 KSL_TABLE[8 * 16] = {
  /* OCT 0 */
  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 (0.000),
  /* OCT 1 */
  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 (0.750), ML (1.125), ML (1.500),
  ML (1.875), ML (2.250), ML (2.625), ML (3.000),
  /* OCT 2 */
  ML (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),
  /* OCT 3 */
  ML (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),
  /* OCT 4 */
  ML (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),
  /* OCT 5 */
  ML (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),
  /* OCT 6 */
  ML (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),
  /* OCT 7 */
  ML (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)
};

#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) ((INT32) (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(x) ((UINT32) (2*(x)))
static const UINT32 MUL_TABLE[16] = {
/* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
  ML (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)
};

#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

/* #define LOG(n,x) if( (n)>=LOG_LEVEL ) logerror x */
#define LOG(n,x) if( (n)>=LOG_LEVEL ) log_printf 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 = (INT32) (((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) * ((int) (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] = (INT32) (rate / ARRATE);
    OPL->DR_TABLE[i] = (INT32) (rate / DRRATE);
  }
  for (i = 60; i < 75; 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 = (int) (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 = (float) 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] = (INT32) ((1.0 / EG_STEP) * pom);     /* 1dB   */
    AMS_TABLE[AMS_ENT + i] = (INT32) ((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 + (INT32) (pom * 0.07);     /* +- 7cent */
    VIB_TABLE[VIB_ENT + i] = VIB_RATE + (INT32) (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] =
        (UINT32) (OPL->freqbase * fn * FREQ_RATE * (1 << 7) / 2);
  }
  /* LFO freq.table */
  OPL->amsIncr =
      (INT32) (OPL->rate ? (double) AMS_ENT * (1 << AMS_SHIFT) / OPL->rate *
      3.7 * ((double) OPL->clock / 3600000) : 0);
  OPL->vibIncr =
      (INT32) (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;
  unsigned 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:
        case 0x0d:             /* PRESCALE   */
        case 0x0e:
        case 0x0f:             /* ADPCM data */
        case 0x10:             /* DELTA-N    */
        case 0x11:             /* DELTA-N    */
        case 0x12:             /* EG-CTRL    */
          if (OPL->type & OPL_TYPE_ADPCM)
            YM_DELTAT_ADPCM_Write (OPL->deltat, r - 0x07, v);
          return;
#if 0
        case 0x15:             /* DAC data    */
        case 0x16:
        case 0x17:             /* SHIFT    */
          return;
        case 0x18:             /* I/O CTRL (Direction) */
          if (OPL->type & OPL_TYPE_IO)
            OPL->portDirection = v & 0x0f;
          return;
        case 0x19:             /* I/O DATA */
          if (OPL->type & OPL_TYPE_IO) {
            OPL->portLatch = v;
            if (OPL->porthandler_w)
              OPL->porthandler_w (OPL->port_param, v & OPL->portDirection);
          }
          return;
        case 0x1a:             /* PCM data */
          return;
#endif
#endif
      }
      break;
    case 0x20:                 /* am,vib,ksr,eg type,mul */
      slot = slot_array[r & 0x1f];
      if (slot == -1)
        return;
      set_mul (OPL, slot, v);
      return;
    case 0x40:
      slot = slot_array[r & 0x1f];
      if (slot == -1)
        return;
      set_ksl_tl (OPL, slot, v);
      return;
    case 0x60:
      slot = slot_array[r & 0x1f];
      if (slot == -1)
        return;
      set_ar_dr (OPL, slot, v);
      return;
    case 0x80:
      slot = slot_array[r & 0x1f];
      if (slot == -1)
        return;
      set_sl_rr (OPL, slot, v);
      return;
    case 0xa0:
      switch (r) {
        case 0xbd:
          /* amsep,vibdep,r,bd,sd,tom,tc,hh */
        {
          UINT8 rkey = OPL->rythm ^ v;

          OPL->ams_table = &AMS_TABLE[v & 0x80 ? AMS_ENT : 0];
          OPL->vib_table = &VIB_TABLE[v & 0x40 ? VIB_ENT : 0];
          OPL->rythm = v & 0x3f;
          if (OPL->rythm & 0x20) {
#if 0
            usrintf_showmessage ("OPL Rythm mode select");
#endif
            /* BD key on/off */
            if (rkey & 0x10) {
              if (v & 0x10) {
                OPL->P_CH[6].op1_out[0] = OPL->P_CH[6].op1_out[1] = 0;
                OPL_KEYON (&OPL->P_CH[6].SLOT[SLOT1]);
                OPL_KEYON (&OPL->P_CH[6].SLOT[SLOT2]);
              } else {
                OPL_KEYOFF (&OPL->P_CH[6].SLOT[SLOT1]);
                OPL_KEYOFF (&OPL->P_CH[6].SLOT[SLOT2]);
              }
            }
            /* SD key on/off */
            if (rkey & 0x08) {
              if (v & 0x08)
                OPL_KEYON (&OPL->P_CH[7].SLOT[SLOT2]);
              else
                OPL_KEYOFF (&OPL->P_CH[7].SLOT[SLOT2]);
            }                   /* TAM key on/off */
            if (rkey & 0x04) {
              if (v & 0x04)
                OPL_KEYON (&OPL->P_CH[8].SLOT[SLOT1]);
              else
                OPL_KEYOFF (&OPL->P_CH[8].SLOT[SLOT1]);
            }
            /* TOP-CY key on/off */
            if (rkey & 0x02) {
              if (v & 0x02)
                OPL_KEYON (&OPL->P_CH[8].SLOT[SLOT2]);
              else
                OPL_KEYOFF (&OPL->P_CH[8].SLOT[SLOT2]);
            }
            /* HH key on/off */
            if (rkey & 0x01) {
              if (v & 0x01)
                OPL_KEYON (&OPL->P_CH[7].SLOT[SLOT1]);
              else
                OPL_KEYOFF (&OPL->P_CH[7].SLOT[SLOT1]);
            }
          }
        }
          return;
      }
      /* keyon,block,fnum */
      if ((r & 0x0f) > 8)
        return;
      CH = &OPL->P_CH[r & 0x0f];
      if (!(r & 0x10)) {        /* a0-a8 */
        block_fnum = (CH->block_fnum & 0x1f00) | v;
      } else {                  /* b0-b8 */
        int keyon = (v >> 5) & 1;

        block_fnum = ((v & 0x1f) << 8) | (CH->block_fnum & 0xff);
        if (CH->keyon != keyon) {
          if ((CH->keyon = keyon)) {
            CH->op1_out[0] = CH->op1_out[1] = 0;
            OPL_KEYON (&CH->SLOT[SLOT1]);
            OPL_KEYON (&CH->SLOT[SLOT2]);
          } else {
            OPL_KEYOFF (&CH->SLOT[SLOT1]);
            OPL_KEYOFF (&CH->SLOT[SLOT2]);
          }
        }
      }
      /* update */
      if (CH->block_fnum != block_fnum) {
        int blockRv = 7 - (block_fnum >> 10);
        int fnum = block_fnum & 0x3ff;

        CH->block_fnum = block_fnum;

        CH->ksl_base = KSL_TABLE[block_fnum >> 6];
        CH->fc = OPL->FN_TABLE[fnum] >> blockRv;
        CH->kcode = CH->block_fnum >> 9;
        if ((OPL->mode & 0x40) && CH->block_fnum & 0x100)
          CH->kcode |= 1;
        CALC_FCSLOT (CH, &CH->SLOT[SLOT1]);
        CALC_FCSLOT (CH, &CH->SLOT[SLOT2]);
      }
      return;
    case 0xc0:
      /* FB,C */
      if ((r & 0x0f) > 8)
        return;
      CH = &OPL->P_CH[r & 0x0f];
      {
        int feedback = (v >> 1) & 7;

        CH->FB = feedback ? (8 + 1) - feedback : 0;
        CH->CON = v & 1;
        set_algorythm (CH);
      }
      return;
    case 0xe0:                 /* wave type */
      slot = slot_array[r & 0x1f];
      if (slot == -1)
        return;
      CH = &OPL->P_CH[slot / 2];
      if (OPL->wavesel) {
        /* LOG(LOG_INF,("OPL SLOT %d wave select %d\n",slot,v&3)); */
        CH->SLOT[slot & 1].wavetable = &SIN_TABLE[(v & 0x03) * SIN_ENT];
      }
      return;
  }
}

/* lock/unlock for common table */
static int
OPL_LockTable (void)
{
  num_lock++;
  if (num_lock > 1)
    return 0;
  /* first time */
  cur_chip = NULL;
  /* allocate total level table (128kb space) */
  if (!OPLOpenTable ()) {
    num_lock--;
    return -1;
  }
  return 0;
}

static void
OPL_UnLockTable (void)
{
  if (num_lock)
    num_lock--;
  if (num_lock)
    return;
  /* last time */
  cur_chip = NULL;
  OPLCloseTable ();
}

#if (BUILD_YM3812 || BUILD_YM3526)
/*******************************************************************************/
/*		YM3812 local section                                                   */
/*******************************************************************************/

/* ---------- update one of chip ----------- */
void
YM3812UpdateOne (FM_OPL * OPL, INT16 * buffer, int length)
{
  int i;
  int data;
  FMSAMPLE *buf = buffer;
  UINT32 amsCnt = OPL->amsCnt;
  UINT32 vibCnt = OPL->vibCnt;
  UINT8 rythm = OPL->rythm & 0x20;
  OPL_CH *CH, *R_CH;

  if ((void *) OPL != cur_chip) {
    cur_chip = (void *) OPL;
    /* channel pointers */
    S_CH = OPL->P_CH;
    E_CH = &S_CH[9];
    /* rythm slot */
    SLOT7_1 = &S_CH[7].SLOT[SLOT1];
    SLOT7_2 = &S_CH[7].SLOT[SLOT2];
    SLOT8_1 = &S_CH[8].SLOT[SLOT1];
    SLOT8_2 = &S_CH[8].SLOT[SLOT2];
    /* LFO state */
    amsIncr = OPL->amsIncr;
    vibIncr = OPL->vibIncr;
    ams_table = OPL->ams_table;
    vib_table = OPL->vib_table;
  }
  R_CH = rythm ? &S_CH[6] : E_CH;
  for (i = 0; i < length; i++) {
    /*            channel A         channel B         channel C      */
    /* LFO */
    ams = ams_table[(amsCnt += amsIncr) >> AMS_SHIFT];
    vib = vib_table[(vibCnt += vibIncr) >> VIB_SHIFT];
    outd[0] = 0;
    /* FM part */
    for (CH = S_CH; CH < R_CH; CH++)
      OPL_CALC_CH (CH);
    /* Rythn part */
    if (rythm)
      OPL_CALC_RH (S_CH);
    /* limit check */
    data = Limit (outd[0], OPL_MAXOUT, OPL_MINOUT);
    /* store to sound buffer */
    buf[i] = data >> OPL_OUTSB;
  }

  OPL->amsCnt = amsCnt;
  OPL->vibCnt = vibCnt;
}
#endif /* (BUILD_YM3812 || BUILD_YM3526) */

#if BUILD_Y8950

void
Y8950UpdateOne (FM_OPL * OPL, INT16 * buffer, int length)
{
  int i;
  int data;
  FMSAMPLE *buf = buffer;
  UINT32 amsCnt = OPL->amsCnt;
  UINT32 vibCnt = OPL->vibCnt;
  UINT8 rythm = OPL->rythm & 0x20;
  OPL_CH *CH, *R_CH;
  YM_DELTAT *DELTAT = OPL->deltat;

  /* setup DELTA-T unit */
  YM_DELTAT_DECODE_PRESET (DELTAT);

  if ((void *) OPL != cur_chip) {
    cur_chip = (void *) OPL;
    /* channel pointers */
    S_CH = OPL->P_CH;
    E_CH = &S_CH[9];
    /* rythm slot */
    SLOT7_1 = &S_CH[7].SLOT[SLOT1];
    SLOT7_2 = &S_CH[7].SLOT[SLOT2];
    SLOT8_1 = &S_CH[8].SLOT[SLOT1];
    SLOT8_2 = &S_CH[8].SLOT[SLOT2];
    /* LFO state */
    amsIncr = OPL->amsIncr;
    vibIncr = OPL->vibIncr;
    ams_table = OPL->ams_table;
    vib_table = OPL->vib_table;
  }
  R_CH = rythm ? &S_CH[6] : E_CH;
  for (i = 0; i < length; i++) {
    /*            channel A         channel B         channel C      */
    /* LFO */
    ams = ams_table[(amsCnt += amsIncr) >> AMS_SHIFT];
    vib = vib_table[(vibCnt += vibIncr) >> VIB_SHIFT];
    outd[0] = 0;
    /* deltaT ADPCM */
    if (DELTAT->flag)
      YM_DELTAT_ADPCM_CALC (DELTAT);
    /* FM part */
    for (CH = S_CH; CH < R_CH; CH++)
      OPL_CALC_CH (CH);
    /* Rythn part */
    if (rythm)
      OPL_CALC_RH (S_CH);
    /* limit check */
    data = Limit (outd[0], OPL_MAXOUT, OPL_MINOUT);
    /* store to sound buffer */
    buf[i] = data >> OPL_OUTSB;
  }
  OPL->amsCnt = amsCnt;
  OPL->vibCnt = vibCnt;
  /* deltaT START flag */
  if (!DELTAT->flag)
    OPL->status &= 0xfe;
}
#endif

/* ---------- reset one of chip ---------- */
void
OPLResetChip (FM_OPL * OPL)
{
  int c, s;
  int i;

  /* reset chip */
  OPL->mode = 0;                /* normal mode */
  OPL_STATUS_RESET (OPL, 0x7f);
  /* reset with register write */
  OPLWriteReg (OPL, 0x01, 0);   /* wabesel disable */
  OPLWriteReg (OPL, 0x02, 0);   /* Timer1 */
  OPLWriteReg (OPL, 0x03, 0);   /* Timer2 */
  OPLWriteReg (OPL, 0x04, 0);   /* IRQ mask clear */
  for (i = 0xff; i >= 0x20; i--)
    OPLWriteReg (OPL, i, 0);
  /* reset OPerator paramater */
  for (c = 0; c < OPL->max_ch; c++) {
    OPL_CH *CH = &OPL->P_CH[c];

    /* OPL->P_CH[c].PAN = OPN_CENTER; */
    for (s = 0; s < 2; s++) {
      /* wave table */
      CH->SLOT[s].wavetable = &SIN_TABLE[0];
      /* CH->SLOT[s].evm = ENV_MOD_RR; */
      CH->SLOT[s].evc = EG_OFF;
      CH->SLOT[s].eve = EG_OFF + 1;
      CH->SLOT[s].evs = 0;
    }
  }
#if BUILD_Y8950
  if (OPL->type & OPL_TYPE_ADPCM) {
    YM_DELTAT *DELTAT = OPL->deltat;

    DELTAT->freqbase = OPL->freqbase;
    DELTAT->output_pointer = outd;
    DELTAT->portshift = 5;
    DELTAT->output_range = DELTAT_MIXING_LEVEL << TL_BITS;
    YM_DELTAT_ADPCM_Reset (DELTAT, 0);
  }
#endif
}

/* ----------  Create one of vietual YM3812 ----------       */
/* 'rate'  is sampling rate and 'bufsiz' is the size of the  */
FM_OPL *
OPLCreate (int type, int clock, int rate)
{
  char *ptr;
  FM_OPL *OPL;
  int state_size;
  int max_ch = 9;               /* normaly 9 channels */

  if (OPL_LockTable () == -1)
    return NULL;
  /* allocate OPL state space */
  state_size = sizeof (FM_OPL);
  state_size += sizeof (OPL_CH) * max_ch;
#if BUILD_Y8950
  if (type & OPL_TYPE_ADPCM)
    state_size += sizeof (YM_DELTAT);
#endif
  /* allocate memory block */
  ptr = malloc (state_size);
  if (ptr == NULL)
    return NULL;
  /* clear */
  memset (ptr, 0, state_size);
  OPL = (FM_OPL *) ptr;
  ptr += sizeof (FM_OPL);
  OPL->P_CH = (OPL_CH *) ptr;
  ptr += sizeof (OPL_CH) * max_ch;
#if BUILD_Y8950
  if (type & OPL_TYPE_ADPCM)
    OPL->deltat = (YM_DELTAT *) ptr;
  ptr += sizeof (YM_DELTAT);
#endif
  /* set channel state pointer */
  OPL->type = type;
  OPL->clock = clock;
  OPL->rate = rate;
  OPL->max_ch = max_ch;
  /* init grobal tables */
  OPL_initalize (OPL);
  /* reset chip */
  OPLResetChip (OPL);
  return OPL;
}

/* ----------  Destroy one of vietual YM3812 ----------       */
void
OPLDestroy (FM_OPL * OPL)
{
  OPL_UnLockTable ();
  free (OPL);
}

/* ----------  Option handlers ----------       */

void
OPLSetTimerHandler (FM_OPL * OPL, OPL_TIMERHANDLER TimerHandler,
    int channelOffset)
{
  OPL->TimerHandler = TimerHandler;
  OPL->TimerParam = channelOffset;
}

void
OPLSetIRQHandler (FM_OPL * OPL, OPL_IRQHANDLER IRQHandler, int param)
{
  OPL->IRQHandler = IRQHandler;
  OPL->IRQParam = param;
}

void
OPLSetUpdateHandler (FM_OPL * OPL, OPL_UPDATEHANDLER UpdateHandler, int param)
{
  OPL->UpdateHandler = UpdateHandler;
  OPL->UpdateParam = param;
}

#if BUILD_Y8950
void
OPLSetPortHandler (FM_OPL * OPL, OPL_PORTHANDLER_W PortHandler_w,
    OPL_PORTHANDLER_R PortHandler_r, int param)
{
  OPL->porthandler_w = PortHandler_w;
  OPL->porthandler_r = PortHandler_r;
  OPL->port_param = param;
}

void
OPLSetKeyboardHandler (FM_OPL * OPL, OPL_PORTHANDLER_W KeyboardHandler_w,
    OPL_PORTHANDLER_R KeyboardHandler_r, int param)
{
  OPL->keyboardhandler_w = KeyboardHandler_w;
  OPL->keyboardhandler_r = KeyboardHandler_r;
  OPL->keyboard_param = param;
}
#endif
/* ---------- YM3812 I/O interface ---------- */
int
OPLWrite (FM_OPL * OPL, int a, int v)
{
  if (!(a & 1)) {               /* address port */
    OPL->address = v & 0xff;
  } else {                      /* data port */
    if (OPL->UpdateHandler)
      OPL->UpdateHandler (OPL->UpdateParam, 0);
    OPLWriteReg (OPL, OPL->address, v);
  }
  return OPL->status >> 7;
}

unsigned char
OPLRead (FM_OPL * OPL, int a)
{
  if (!(a & 1)) {               /* status port */
    return OPL->status & (OPL->statusmask | 0x80);
  }
  /* data port */
  switch (OPL->address) {
    case 0x05:                 /* KeyBoard IN */
      if (OPL->type & OPL_TYPE_KEYBOARD) {
        if (OPL->keyboardhandler_r)
          return OPL->keyboardhandler_r (OPL->keyboard_param);
        else
          LOG (LOG_WAR, ("OPL:read unmapped KEYBOARD port\n"));
      }
      return 0;
#if 0
    case 0x0f:                 /* ADPCM-DATA  */
      return 0;
#endif
    case 0x19:                 /* I/O DATA    */
      if (OPL->type & OPL_TYPE_IO) {
        if (OPL->porthandler_r)
          return OPL->porthandler_r (OPL->port_param);
        else
          LOG (LOG_WAR, ("OPL:read unmapped I/O port\n"));
      }
      return 0;
    case 0x1a:                 /* PCM-DATA    */
      return 0;
  }
  return 0;
}

int
OPLTimerOver (FM_OPL * OPL, int c)
{
  if (c) {                      /* Timer B */
    OPL_STATUS_SET (OPL, 0x20);
  } else {                      /* Timer A */
    OPL_STATUS_SET (OPL, 0x40);
    /* CSM mode key,TL controll */
    if (OPL->mode & 0x80) {     /* CSM mode total level latch and auto key on */
      int ch;

      if (OPL->UpdateHandler)
        OPL->UpdateHandler (OPL->UpdateParam, 0);
      for (ch = 0; ch < 9; ch++)
        CSMKeyControll (&OPL->P_CH[ch]);
    }
  }
  /* reload timer */
  if (OPL->TimerHandler)
    (OPL->TimerHandler) (OPL->TimerParam + c,
        (double) OPL->T[c] * OPL->TimerBase);
  return OPL->status >> 7;
}
