hw/audio/fmopl.c

   1 /*
   2 **
   3 ** File: fmopl.c -- software implementation of FM sound generator
   4 **
   5 ** Copyright (C) 1999,2000 Tatsuyuki Satoh , MultiArcadeMachineEmurator development
   6 **
   7 ** Version 0.37a
   8 **
   9 */
  10
  11 /*
  12         preliminary :
  13         Problem :
  14         note:
  15 */
  16
  17 /* This version of fmopl.c is a fork of the MAME one, relicensed under the LGPL.
  18  *
  19  * This library is free software; you can redistribute it and/or
  20  * modify it under the terms of the GNU Lesser General Public
  21  * License as published by the Free Software Foundation; either
  22  * version 2.1 of the License, or (at your option) any later version.
  23  *
  24  * This library is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  27  * Lesser General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU Lesser General Public
  30  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  31  */
  32
  33 #include "qemu/osdep.h"
  34 #include <math.h>
  35 //#include "driver.h"           /* use M.A.M.E. */
  36 #include "fmopl.h"
  37
  38 #ifndef PI
  39 #define PI 3.14159265358979323846
  40 #endif
  41
  42 #ifndef ARRAY_SIZE
  43 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  44 #endif
  45
  46 /* -------------------- for debug --------------------- */
  47 /* #define OPL_OUTPUT_LOG */
  48 #ifdef OPL_OUTPUT_LOG
  49 static FILE *opl_dbg_fp = NULL;
  50 static FM_OPL *opl_dbg_opl[16];
  51 static int opl_dbg_maxchip,opl_dbg_chip;
  52 #endif
  53
  54 /* -------------------- preliminary define section --------------------- */
  55 /* attack/decay rate time rate */
  56 #define OPL_ARRATE     141280  /* RATE 4 =  2826.24ms @ 3.6MHz */
  57 #define OPL_DRRATE    1956000  /* RATE 4 = 39280.64ms @ 3.6MHz */
  58
  59 #define DELTAT_MIXING_LEVEL (1) /* DELTA-T ADPCM MIXING LEVEL */
  60
  61 #define FREQ_BITS 24                    /* frequency turn          */
  62
  63 /* counter bits = 20 , octerve 7 */
  64 #define FREQ_RATE   (1<<(FREQ_BITS-20))
  65 #define TL_BITS    (FREQ_BITS+2)
  66
  67 /* final output shift , limit minimum and maximum */
  68 #define OPL_OUTSB   (TL_BITS+3-16)              /* OPL output final shift 16bit */
  69 #define OPL_MAXOUT (0x7fff<<OPL_OUTSB)
  70 #define OPL_MINOUT (-0x8000<<OPL_OUTSB)
  71
  72 /* -------------------- quality selection --------------------- */
  73
  74 /* sinwave entries */
  75 /* used static memory = SIN_ENT * 4 (byte) */
  76 #define SIN_ENT 2048
  77
  78 /* output level entries (envelope,sinwave) */
  79 /* envelope counter lower bits */
  80 #define ENV_BITS 16
  81 /* envelope output entries */
  82 #define EG_ENT   4096
  83 /* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */
  84 /* used static  memory = EG_ENT*4 (byte)                     */
  85
  86 #define EG_OFF   ((2*EG_ENT)<<ENV_BITS)  /* OFF          */
  87 #define EG_DED   EG_OFF
  88 #define EG_DST   (EG_ENT<<ENV_BITS)      /* DECAY  START */
  89 #define EG_AED   EG_DST
  90 #define EG_AST   0                       /* ATTACK START */
  91
  92 #define EG_STEP (96.0/EG_ENT) /* OPL is 0.1875 dB step  */
  93
  94 /* LFO table entries */
  95 #define VIB_ENT 512
  96 #define VIB_SHIFT (32-9)
  97 #define AMS_ENT 512
  98 #define AMS_SHIFT (32-9)
  99
 100 #define VIB_RATE 256
 101
 102 /* -------------------- local defines , macros --------------------- */
 103
 104 /* register number to channel number , slot offset */
 105 #define SLOT1 0
 106 #define SLOT2 1
 107
 108 /* envelope phase */
 109 #define ENV_MOD_RR  0x00
 110 #define ENV_MOD_DR  0x01
 111 #define ENV_MOD_AR  0x02
 112
 113 /* -------------------- tables --------------------- */
 114 static const int slot_array[32]=
 115 {
 116          0, 2, 4, 1, 3, 5,-1,-1,
 117          6, 8,10, 7, 9,11,-1,-1,
 118         12,14,16,13,15,17,-1,-1,
 119         -1,-1,-1,-1,-1,-1,-1,-1
 120 };
 121
 122 /* key scale level */
 123 /* table is 3dB/OCT , DV converts this in TL step at 6dB/OCT */
 124 #define DV (EG_STEP/2)
 125 static const uint32_t KSL_TABLE[8*16]=
 126 {
 127         /* OCT 0 */
 128          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 129          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 130          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 131          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 132         /* OCT 1 */
 133          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 134          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 135          0.000/DV, 0.750/DV, 1.125/DV, 1.500/DV,
 136          1.875/DV, 2.250/DV, 2.625/DV, 3.000/DV,
 137         /* OCT 2 */
 138          0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV,
 139          0.000/DV, 1.125/DV, 1.875/DV, 2.625/DV,
 140          3.000/DV, 3.750/DV, 4.125/DV, 4.500/DV,
 141          4.875/DV, 5.250/DV, 5.625/DV, 6.000/DV,
 142         /* OCT 3 */
 143          0.000/DV, 0.000/DV, 0.000/DV, 1.875/DV,
 144          3.000/DV, 4.125/DV, 4.875/DV, 5.625/DV,
 145          6.000/DV, 6.750/DV, 7.125/DV, 7.500/DV,
 146          7.875/DV, 8.250/DV, 8.625/DV, 9.000/DV,
 147         /* OCT 4 */
 148          0.000/DV, 0.000/DV, 3.000/DV, 4.875/DV,
 149          6.000/DV, 7.125/DV, 7.875/DV, 8.625/DV,
 150          9.000/DV, 9.750/DV,10.125/DV,10.500/DV,
 151         10.875/DV,11.250/DV,11.625/DV,12.000/DV,
 152         /* OCT 5 */
 153          0.000/DV, 3.000/DV, 6.000/DV, 7.875/DV,
 154          9.000/DV,10.125/DV,10.875/DV,11.625/DV,
 155         12.000/DV,12.750/DV,13.125/DV,13.500/DV,
 156         13.875/DV,14.250/DV,14.625/DV,15.000/DV,
 157         /* OCT 6 */
 158          0.000/DV, 6.000/DV, 9.000/DV,10.875/DV,
 159         12.000/DV,13.125/DV,13.875/DV,14.625/DV,
 160         15.000/DV,15.750/DV,16.125/DV,16.500/DV,
 161         16.875/DV,17.250/DV,17.625/DV,18.000/DV,
 162         /* OCT 7 */
 163          0.000/DV, 9.000/DV,12.000/DV,13.875/DV,
 164         15.000/DV,16.125/DV,16.875/DV,17.625/DV,
 165         18.000/DV,18.750/DV,19.125/DV,19.500/DV,
 166         19.875/DV,20.250/DV,20.625/DV,21.000/DV
 167 };
 168 #undef DV
 169
 170 /* sustain lebel table (3db per step) */
 171 /* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/
 172 #define SC(db) (db*((3/EG_STEP)*(1<<ENV_BITS)))+EG_DST
 173 static const int32_t SL_TABLE[16]={
 174  SC( 0),SC( 1),SC( 2),SC(3 ),SC(4 ),SC(5 ),SC(6 ),SC( 7),
 175  SC( 8),SC( 9),SC(10),SC(11),SC(12),SC(13),SC(14),SC(31)
 176 };
 177 #undef SC
 178
 179 #define TL_MAX (EG_ENT*2) /* limit(tl + ksr + envelope) + sinwave */
 180 /* TotalLevel : 48 24 12  6  3 1.5 0.75 (dB) */
 181 /* TL_TABLE[ 0      to TL_MAX          ] : plus  section */
 182 /* TL_TABLE[ TL_MAX to TL_MAX+TL_MAX-1 ] : minus section */
 183 static int32_t *TL_TABLE;
 184
 185 /* pointers to TL_TABLE with sinwave output offset */
 186 static int32_t **SIN_TABLE;
 187
 188 /* LFO table */
 189 static int32_t *AMS_TABLE;
 190 static int32_t *VIB_TABLE;
 191
 192 /* envelope output curve table */
 193 /* attack + decay + OFF */
 194 static int32_t ENV_CURVE[2*EG_ENT+1];
 195
 196 /* multiple table */
 197 #define ML 2
 198 static const uint32_t MUL_TABLE[16]= {
 199 /* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */
 200    0.50*ML, 1.00*ML, 2.00*ML, 3.00*ML, 4.00*ML, 5.00*ML, 6.00*ML, 7.00*ML,
 201    8.00*ML, 9.00*ML,10.00*ML,10.00*ML,12.00*ML,12.00*ML,15.00*ML,15.00*ML
 202 };
 203 #undef ML
 204
 205 /* dummy attack / decay rate ( when rate == 0 ) */
 206 static int32_t RATE_0[16]=
 207 {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
 208
 209 /* -------------------- static state --------------------- */
 210
 211 /* lock level of common table */
 212 static int num_lock = 0;
 213
 214 /* work table */
 215 static void *cur_chip = NULL;   /* current chip point */
 216 /* currenct chip state */
 217 /* static OPLSAMPLE  *bufL,*bufR; */
 218 static OPL_CH *S_CH;
 219 static OPL_CH *E_CH;
 220 static OPL_SLOT *SLOT7_1, *SLOT7_2, *SLOT8_1, *SLOT8_2;
 221
 222 static int32_t outd[1];
 223 static int32_t ams;
 224 static int32_t vib;
 225 static int32_t *ams_table;
 226 static int32_t *vib_table;
 227 static int32_t amsIncr;
 228 static int32_t vibIncr;
 229 static int32_t feedback2;               /* connect for SLOT 2 */
 230
 231 /* log output level */
 232 #define LOG_ERR  3      /* ERROR       */
 233 #define LOG_WAR  2      /* WARNING     */
 234 #define LOG_INF  1      /* INFORMATION */
 235
 236 //#define LOG_LEVEL LOG_INF
 237 #define LOG_LEVEL       LOG_ERR
 238
 239 //#define LOG(n,x) if( (n)>=LOG_LEVEL ) logerror x
 240 #define LOG(n,x)
 241
 242 /* --------------------- subroutines  --------------------- */
 243
 244 static inline int Limit( int val, int max, int min ) {
 245         if ( val > max )
 246                 val = max;
 247         else if ( val < min )
 248                 val = min;
 249
 250         return val;
 251 }
 252
 253 /* status set and IRQ handling */
 254 static inline void OPL_STATUS_SET(FM_OPL *OPL,int flag)
 255 {
 256         /* set status flag */
 257         OPL->status |= flag;
 258         if(!(OPL->status & 0x80))
 259         {
 260                 if(OPL->status & OPL->statusmask)
 261                 {       /* IRQ on */
 262                         OPL->status |= 0x80;
 263                 }
 264         }
 265 }
 266
 267 /* status reset and IRQ handling */
 268 static inline void OPL_STATUS_RESET(FM_OPL *OPL,int flag)
 269 {
 270         /* reset status flag */
 271         OPL->status &=~flag;
 272         if((OPL->status & 0x80))
 273         {
 274                 if (!(OPL->status & OPL->statusmask) )
 275                 {
 276                         OPL->status &= 0x7f;
 277                 }
 278         }
 279 }
 280
 281 /* IRQ mask set */
 282 static inline void OPL_STATUSMASK_SET(FM_OPL *OPL,int flag)
 283 {
 284         OPL->statusmask = flag;
 285         /* IRQ handling check */
 286         OPL_STATUS_SET(OPL,0);
 287         OPL_STATUS_RESET(OPL,0);
 288 }
 289
 290 /* ----- key on  ----- */
 291 static inline void OPL_KEYON(OPL_SLOT *SLOT)
 292 {
 293         /* sin wave restart */
 294         SLOT->Cnt = 0;
 295         /* set attack */
 296         SLOT->evm = ENV_MOD_AR;
 297         SLOT->evs = SLOT->evsa;
 298         SLOT->evc = EG_AST;
 299         SLOT->eve = EG_AED;
 300 }
 301 /* ----- key off ----- */
 302 static inline void OPL_KEYOFF(OPL_SLOT *SLOT)
 303 {
 304         if( SLOT->evm > ENV_MOD_RR)
 305         {
 306                 /* set envelope counter from envleope output */
 307                 SLOT->evm = ENV_MOD_RR;
 308                 if( !(SLOT->evc&EG_DST) )
 309                         //SLOT->evc = (ENV_CURVE[SLOT->evc>>ENV_BITS]<<ENV_BITS) + EG_DST;
 310                         SLOT->evc = EG_DST;
 311                 SLOT->eve = EG_DED;
 312                 SLOT->evs = SLOT->evsr;
 313         }
 314 }
 315
 316 /* ---------- calcrate Envelope Generator & Phase Generator ---------- */
 317 /* return : envelope output */
 318 static inline uint32_t OPL_CALC_SLOT( OPL_SLOT *SLOT )
 319 {
 320         /* calcrate envelope generator */
 321         if( (SLOT->evc+=SLOT->evs) >= SLOT->eve )
 322         {
 323                 switch( SLOT->evm ){
 324                 case ENV_MOD_AR: /* ATTACK -> DECAY1 */
 325                         /* next DR */
 326                         SLOT->evm = ENV_MOD_DR;
 327                         SLOT->evc = EG_DST;
 328                         SLOT->eve = SLOT->SL;
 329                         SLOT->evs = SLOT->evsd;
 330                         break;
 331                 case ENV_MOD_DR: /* DECAY -> SL or RR */
 332                         SLOT->evc = SLOT->SL;
 333                         SLOT->eve = EG_DED;
 334                         if(SLOT->eg_typ)
 335                         {
 336                                 SLOT->evs = 0;
 337                         }
 338                         else
 339                         {
 340                                 SLOT->evm = ENV_MOD_RR;
 341                                 SLOT->evs = SLOT->evsr;
 342                         }
 343                         break;
 344                 case ENV_MOD_RR: /* RR -> OFF */
 345                         SLOT->evc = EG_OFF;
 346                         SLOT->eve = EG_OFF+1;
 347                         SLOT->evs = 0;
 348                         break;
 349                 }
 350         }
 351         /* calcrate envelope */
 352         return SLOT->TLL+ENV_CURVE[SLOT->evc>>ENV_BITS]+(SLOT->ams ? ams : 0);
 353 }
 354
 355 /* set algorithm connection */
 356 static void set_algorithm( OPL_CH *CH)
 357 {
 358         int32_t *carrier = &outd[0];
 359         CH->connect1 = CH->CON ? carrier : &feedback2;
 360         CH->connect2 = carrier;
 361 }
 362
 363 /* ---------- frequency counter for operater update ---------- */
 364 static inline void CALC_FCSLOT(OPL_CH *CH,OPL_SLOT *SLOT)
 365 {
 366         int ksr;
 367
 368         /* frequency step counter */
 369         SLOT->Incr = CH->fc * SLOT->mul;
 370         ksr = CH->kcode >> SLOT->KSR;
 371
 372         if( SLOT->ksr != ksr )
 373         {
 374                 SLOT->ksr = ksr;
 375                 /* attack , decay rate recalcration */
 376                 SLOT->evsa = SLOT->AR[ksr];
 377                 SLOT->evsd = SLOT->DR[ksr];
 378                 SLOT->evsr = SLOT->RR[ksr];
 379         }
 380         SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
 381 }
 382
 383 /* set multi,am,vib,EG-TYP,KSR,mul */
 384 static inline void set_mul(FM_OPL *OPL,int slot,int v)
 385 {
 386         OPL_CH   *CH   = &OPL->P_CH[slot/2];
 387         OPL_SLOT *SLOT = &CH->SLOT[slot&1];
 388
 389         SLOT->mul    = MUL_TABLE[v&0x0f];
 390         SLOT->KSR    = (v&0x10) ? 0 : 2;
 391         SLOT->eg_typ = (v&0x20)>>5;
 392         SLOT->vib    = (v&0x40);
 393         SLOT->ams    = (v&0x80);
 394         CALC_FCSLOT(CH,SLOT);
 395 }
 396
 397 /* set ksl & tl */
 398 static inline void set_ksl_tl(FM_OPL *OPL,int slot,int v)
 399 {
 400         OPL_CH   *CH   = &OPL->P_CH[slot/2];
 401         OPL_SLOT *SLOT = &CH->SLOT[slot&1];
 402         int ksl = v>>6; /* 0 / 1.5 / 3 / 6 db/OCT */
 403
 404         SLOT->ksl = ksl ? 3-ksl : 31;
 405         SLOT->TL  = (v&0x3f)*(0.75/EG_STEP); /* 0.75db step */
 406
 407         if( !(OPL->mode&0x80) )
 408         {       /* not CSM latch total level */
 409                 SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl);
 410         }
 411 }
 412
 413 /* set attack rate & decay rate  */
 414 static inline void set_ar_dr(FM_OPL *OPL,int slot,int v)
 415 {
 416         OPL_CH   *CH   = &OPL->P_CH[slot/2];
 417         OPL_SLOT *SLOT = &CH->SLOT[slot&1];
 418         int ar = v>>4;
 419         int dr = v&0x0f;
 420
 421         SLOT->AR = ar ? &OPL->AR_TABLE[ar<<2] : RATE_0;
 422         SLOT->evsa = SLOT->AR[SLOT->ksr];
 423         if( SLOT->evm == ENV_MOD_AR ) SLOT->evs = SLOT->evsa;
 424
 425         SLOT->DR = dr ? &OPL->DR_TABLE[dr<<2] : RATE_0;
 426         SLOT->evsd = SLOT->DR[SLOT->ksr];
 427         if( SLOT->evm == ENV_MOD_DR ) SLOT->evs = SLOT->evsd;
 428 }
 429
 430 /* set sustain level & release rate */
 431 static inline void set_sl_rr(FM_OPL *OPL,int slot,int v)
 432 {
 433         OPL_CH   *CH   = &OPL->P_CH[slot/2];
 434         OPL_SLOT *SLOT = &CH->SLOT[slot&1];
 435         int sl = v>>4;
 436         int rr = v & 0x0f;
 437
 438         SLOT->SL = SL_TABLE[sl];
 439         if( SLOT->evm == ENV_MOD_DR ) SLOT->eve = SLOT->SL;
 440         SLOT->RR = &OPL->DR_TABLE[rr<<2];
 441         SLOT->evsr = SLOT->RR[SLOT->ksr];
 442         if( SLOT->evm == ENV_MOD_RR ) SLOT->evs = SLOT->evsr;
 443 }
 444
 445 /* operator output calcrator */
 446 #define OP_OUT(slot,env,con)   slot->wavetable[((slot->Cnt+con)/(0x1000000/SIN_ENT))&(SIN_ENT-1)][env]
 447 /* ---------- calcrate one of channel ---------- */
 448 static inline void OPL_CALC_CH( OPL_CH *CH )
 449 {
 450         uint32_t env_out;
 451         OPL_SLOT *SLOT;
 452
 453         feedback2 = 0;
 454         /* SLOT 1 */
 455         SLOT = &CH->SLOT[SLOT1];
 456         env_out=OPL_CALC_SLOT(SLOT);
 457         if( env_out < EG_ENT-1 )
 458         {
 459                 /* PG */
 460                 if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
 461                 else          SLOT->Cnt += SLOT->Incr;
 462                 /* connectoion */
 463                 if(CH->FB)
 464                 {
 465                         int feedback1 = (CH->op1_out[0]+CH->op1_out[1])>>CH->FB;
 466                         CH->op1_out[1] = CH->op1_out[0];
 467                         *CH->connect1 += CH->op1_out[0] = OP_OUT(SLOT,env_out,feedback1);
 468                 }
 469                 else
 470                 {
 471                         *CH->connect1 += OP_OUT(SLOT,env_out,0);
 472                 }
 473         }else
 474         {
 475                 CH->op1_out[1] = CH->op1_out[0];
 476                 CH->op1_out[0] = 0;
 477         }
 478         /* SLOT 2 */
 479         SLOT = &CH->SLOT[SLOT2];
 480         env_out=OPL_CALC_SLOT(SLOT);
 481         if( env_out < EG_ENT-1 )
 482         {
 483                 /* PG */
 484                 if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
 485                 else          SLOT->Cnt += SLOT->Incr;
 486                 /* connectoion */
 487                 outd[0] += OP_OUT(SLOT,env_out, feedback2);
 488         }
 489 }
 490
 491 /* ---------- calcrate rhythm block ---------- */
 492 #define WHITE_NOISE_db 6.0
 493 static inline void OPL_CALC_RH( OPL_CH *CH )
 494 {
 495         uint32_t env_tam,env_sd,env_top,env_hh;
 496         int whitenoise = (rand()&1)*(WHITE_NOISE_db/EG_STEP);
 497         int32_t tone8;
 498
 499         OPL_SLOT *SLOT;
 500         int env_out;
 501
 502         /* BD : same as FM serial mode and output level is large */
 503         feedback2 = 0;
 504         /* SLOT 1 */
 505         SLOT = &CH[6].SLOT[SLOT1];
 506         env_out=OPL_CALC_SLOT(SLOT);
 507         if( env_out < EG_ENT-1 )
 508         {
 509                 /* PG */
 510                 if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
 511                 else          SLOT->Cnt += SLOT->Incr;
 512                 /* connectoion */
 513                 if(CH[6].FB)
 514                 {
 515                         int feedback1 = (CH[6].op1_out[0]+CH[6].op1_out[1])>>CH[6].FB;
 516                         CH[6].op1_out[1] = CH[6].op1_out[0];
 517                         feedback2 = CH[6].op1_out[0] = OP_OUT(SLOT,env_out,feedback1);
 518                 }
 519                 else
 520                 {
 521                         feedback2 = OP_OUT(SLOT,env_out,0);
 522                 }
 523         }else
 524         {
 525                 feedback2 = 0;
 526                 CH[6].op1_out[1] = CH[6].op1_out[0];
 527                 CH[6].op1_out[0] = 0;
 528         }
 529         /* SLOT 2 */
 530         SLOT = &CH[6].SLOT[SLOT2];
 531         env_out=OPL_CALC_SLOT(SLOT);
 532         if( env_out < EG_ENT-1 )
 533         {
 534                 /* PG */
 535                 if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE);
 536                 else          SLOT->Cnt += SLOT->Incr;
 537                 /* connectoion */
 538                 outd[0] += OP_OUT(SLOT,env_out, feedback2)*2;
 539         }
 540
 541         // SD  (17) = mul14[fnum7] + white noise
 542         // TAM (15) = mul15[fnum8]
 543         // TOP (18) = fnum6(mul18[fnum8]+whitenoise)
 544         // HH  (14) = fnum7(mul18[fnum8]+whitenoise) + white noise
 545         env_sd =OPL_CALC_SLOT(SLOT7_2) + whitenoise;
 546         env_tam=OPL_CALC_SLOT(SLOT8_1);
 547         env_top=OPL_CALC_SLOT(SLOT8_2);
 548         env_hh =OPL_CALC_SLOT(SLOT7_1) + whitenoise;
 549
 550         /* PG */
 551         if(SLOT7_1->vib) SLOT7_1->Cnt += (2*SLOT7_1->Incr*vib/VIB_RATE);
 552         else             SLOT7_1->Cnt += 2*SLOT7_1->Incr;
 553         if(SLOT7_2->vib) SLOT7_2->Cnt += ((CH[7].fc*8)*vib/VIB_RATE);
 554         else             SLOT7_2->Cnt += (CH[7].fc*8);
 555         if(SLOT8_1->vib) SLOT8_1->Cnt += (SLOT8_1->Incr*vib/VIB_RATE);
 556         else             SLOT8_1->Cnt += SLOT8_1->Incr;
 557         if(SLOT8_2->vib) SLOT8_2->Cnt += ((CH[8].fc*48)*vib/VIB_RATE);
 558         else             SLOT8_2->Cnt += (CH[8].fc*48);
 559
 560         tone8 = OP_OUT(SLOT8_2,whitenoise,0 );
 561
 562         /* SD */
 563         if( env_sd < EG_ENT-1 )
 564                 outd[0] += OP_OUT(SLOT7_1,env_sd, 0)*8;
 565         /* TAM */
 566         if( env_tam < EG_ENT-1 )
 567                 outd[0] += OP_OUT(SLOT8_1,env_tam, 0)*2;
 568         /* TOP-CY */
 569         if( env_top < EG_ENT-1 )
 570                 outd[0] += OP_OUT(SLOT7_2,env_top,tone8)*2;
 571         /* HH */
 572         if( env_hh  < EG_ENT-1 )
 573                 outd[0] += OP_OUT(SLOT7_2,env_hh,tone8)*2;
 574 }
 575
 576 /* ----------- initialize time tabls ----------- */
 577 static void init_timetables( FM_OPL *OPL , int ARRATE , int DRRATE )
 578 {
 579         int i;
 580         double rate;
 581
 582         /* make attack rate & decay rate tables */
 583         for (i = 0;i < 4;i++) OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0;
 584         for (i = 4;i <= 60;i++){
 585                 rate  = OPL->freqbase;                                          /* frequency rate */
 586                 if( i < 60 ) rate *= 1.0+(i&3)*0.25;            /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */
 587                 rate *= 1<<((i>>2)-1);                                          /* b2-5 : shift bit */
 588                 rate *= (double)(EG_ENT<<ENV_BITS);
 589                 OPL->AR_TABLE[i] = rate / ARRATE;
 590                 OPL->DR_TABLE[i] = rate / DRRATE;
 591         }
 592         for (i = 60; i < ARRAY_SIZE(OPL->AR_TABLE); i++)
 593         {
 594                 OPL->AR_TABLE[i] = EG_AED-1;
 595                 OPL->DR_TABLE[i] = OPL->DR_TABLE[60];
 596         }
 597 #if 0
 598         for (i = 0;i < 64 ;i++){        /* make for overflow area */
 599                 LOG(LOG_WAR, ("rate %2d , ar %f ms , dr %f ms\n", i,
 600                         ((double)(EG_ENT<<ENV_BITS) / OPL->AR_TABLE[i]) * (1000.0 / OPL->rate),
 601                         ((double)(EG_ENT<<ENV_BITS) / OPL->DR_TABLE[i]) * (1000.0 / OPL->rate) ));
 602         }
 603 #endif
 604 }
 605
 606 /* ---------- generic table initialize ---------- */
 607 static int OPLOpenTable( void )
 608 {
 609         int s,t;
 610         double rate;
 611         int i,j;
 612         double pom;
 613
 614         /* allocate dynamic tables */
 615         if( (TL_TABLE = malloc(TL_MAX*2*sizeof(int32_t))) == NULL)
 616                 return 0;
 617         if( (SIN_TABLE = malloc(SIN_ENT*4 *sizeof(int32_t *))) == NULL)
 618         {
 619                 free(TL_TABLE);
 620                 return 0;
 621         }
 622         if( (AMS_TABLE = malloc(AMS_ENT*2 *sizeof(int32_t))) == NULL)
 623         {
 624                 free(TL_TABLE);
 625                 free(SIN_TABLE);
 626                 return 0;
 627         }
 628         if( (VIB_TABLE = malloc(VIB_ENT*2 *sizeof(int32_t))) == NULL)
 629         {
 630                 free(TL_TABLE);
 631                 free(SIN_TABLE);
 632                 free(AMS_TABLE);
 633                 return 0;
 634         }
 635         /* make total level table */
 636         for (t = 0;t < EG_ENT-1 ;t++){
 637                 rate = ((1<<TL_BITS)-1)/pow(10,EG_STEP*t/20);   /* dB -> voltage */
 638                 TL_TABLE[       t] =  (int)rate;
 639                 TL_TABLE[TL_MAX+t] = -TL_TABLE[t];
 640 /*              LOG(LOG_INF,("TotalLevel(%3d) = %x\n",t,TL_TABLE[t]));*/
 641         }
 642         /* fill volume off area */
 643         for ( t = EG_ENT-1; t < TL_MAX ;t++){
 644                 TL_TABLE[t] = TL_TABLE[TL_MAX+t] = 0;
 645         }
 646
 647         /* make sinwave table (total level offet) */
 648         /* degree 0 = degree 180                   = off */
 649         SIN_TABLE[0] = SIN_TABLE[SIN_ENT/2]         = &TL_TABLE[EG_ENT-1];
 650         for (s = 1;s <= SIN_ENT/4;s++){
 651                 pom = sin(2*PI*s/SIN_ENT); /* sin     */
 652                 pom = 20*log10(1/pom);     /* decibel */
 653                 j = pom / EG_STEP;         /* TL_TABLE steps */
 654
 655         /* degree 0   -  90    , degree 180 -  90 : plus section */
 656                 SIN_TABLE[          s] = SIN_TABLE[SIN_ENT/2-s] = &TL_TABLE[j];
 657         /* degree 180 - 270    , degree 360 - 270 : minus section */
 658                 SIN_TABLE[SIN_ENT/2+s] = SIN_TABLE[SIN_ENT  -s] = &TL_TABLE[TL_MAX+j];
 659 /*              LOG(LOG_INF,("sin(%3d) = %f:%f db\n",s,pom,(double)j * EG_STEP));*/
 660         }
 661         for (s = 0;s < SIN_ENT;s++)
 662         {
 663                 SIN_TABLE[SIN_ENT*1+s] = s<(SIN_ENT/2) ? SIN_TABLE[s] : &TL_TABLE[EG_ENT];
 664                 SIN_TABLE[SIN_ENT*2+s] = SIN_TABLE[s % (SIN_ENT/2)];
 665                 SIN_TABLE[SIN_ENT*3+s] = (s/(SIN_ENT/4))&1 ? &TL_TABLE[EG_ENT] : SIN_TABLE[SIN_ENT*2+s];
 666         }
 667
 668         /* envelope counter -> envelope output table */
 669         for (i=0; i<EG_ENT; i++)
 670         {
 671                 /* ATTACK curve */
 672                 pom = pow( ((double)(EG_ENT-1-i)/EG_ENT) , 8 ) * EG_ENT;
 673                 /* if( pom >= EG_ENT ) pom = EG_ENT-1; */
 674                 ENV_CURVE[i] = (int)pom;
 675                 /* DECAY ,RELEASE curve */
 676                 ENV_CURVE[(EG_DST>>ENV_BITS)+i]= i;
 677         }
 678         /* off */
 679         ENV_CURVE[EG_OFF>>ENV_BITS]= EG_ENT-1;
 680         /* make LFO ams table */
 681         for (i=0; i<AMS_ENT; i++)
 682         {
 683                 pom = (1.0+sin(2*PI*i/AMS_ENT))/2; /* sin */
 684                 AMS_TABLE[i]         = (1.0/EG_STEP)*pom; /* 1dB   */
 685                 AMS_TABLE[AMS_ENT+i] = (4.8/EG_STEP)*pom; /* 4.8dB */
 686         }
 687         /* make LFO vibrate table */
 688         for (i=0; i<VIB_ENT; i++)
 689         {
 690                 /* 100cent = 1seminote = 6% ?? */
 691                 pom = (double)VIB_RATE*0.06*sin(2*PI*i/VIB_ENT); /* +-100sect step */
 692                 VIB_TABLE[i]         = VIB_RATE + (pom*0.07); /* +- 7cent */
 693                 VIB_TABLE[VIB_ENT+i] = VIB_RATE + (pom*0.14); /* +-14cent */
 694                 /* LOG(LOG_INF,("vib %d=%d\n",i,VIB_TABLE[VIB_ENT+i])); */
 695         }
 696         return 1;
 697 }
 698
 699
 700 static void OPLCloseTable( void )
 701 {
 702         free(TL_TABLE);
 703         free(SIN_TABLE);
 704         free(AMS_TABLE);
 705         free(VIB_TABLE);
 706 }
 707
 708 /* CSM Key Control */
 709 static inline void CSMKeyControll(OPL_CH *CH)
 710 {
 711         OPL_SLOT *slot1 = &CH->SLOT[SLOT1];
 712         OPL_SLOT *slot2 = &CH->SLOT[SLOT2];
 713         /* all key off */
 714         OPL_KEYOFF(slot1);
 715         OPL_KEYOFF(slot2);
 716         /* total level latch */
 717         slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
 718         slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl);
 719         /* key on */
 720         CH->op1_out[0] = CH->op1_out[1] = 0;
 721         OPL_KEYON(slot1);
 722         OPL_KEYON(slot2);
 723 }
 724
 725 /* ---------- opl initialize ---------- */
 726 static void OPL_initialize(FM_OPL *OPL)
 727 {
 728         int fn;
 729
 730         /* frequency base */
 731         OPL->freqbase = (OPL->rate) ? ((double)OPL->clock / OPL->rate) / 72  : 0;
 732         /* Timer base time */
 733         OPL->TimerBase = 1.0/((double)OPL->clock / 72.0 );
 734         /* make time tables */
 735         init_timetables( OPL , OPL_ARRATE , OPL_DRRATE );
 736         /* make fnumber -> increment counter table */
 737         for( fn=0 ; fn < 1024 ; fn++ )
 738         {
 739                 OPL->FN_TABLE[fn] = OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2;
 740         }
 741         /* LFO freq.table */
 742         OPL->amsIncr = OPL->rate ? (double)AMS_ENT*(1<<AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0;
 743         OPL->vibIncr = OPL->rate ? (double)VIB_ENT*(1<<VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0;
 744 }
 745
 746 /* ---------- write a OPL registers ---------- */
 747 static void OPLWriteReg(FM_OPL *OPL, int r, int v)
 748 {
 749         OPL_CH *CH;
 750         int slot;
 751         int block_fnum;
 752
 753         switch(r&0xe0)
 754         {
 755         case 0x00: /* 00-1f:control */
 756                 switch(r&0x1f)
 757                 {
 758                 case 0x01:
 759                         /* wave selector enable */
 760                         OPL->wavesel = v&0x20;
 761                         if(!OPL->wavesel)
 762                         {
 763                                 /* preset compatible mode */
 764                                 int c;
 765                                 for(c=0;c<OPL->max_ch;c++)
 766                                 {
 767                                         OPL->P_CH[c].SLOT[SLOT1].wavetable = &SIN_TABLE[0];
 768                                         OPL->P_CH[c].SLOT[SLOT2].wavetable = &SIN_TABLE[0];
 769                                 }
 770                         }
 771                         return;
 772                 case 0x02:      /* Timer 1 */
 773                         OPL->T[0] = (256-v)*4;
 774                         break;
 775                 case 0x03:      /* Timer 2 */
 776                         OPL->T[1] = (256-v)*16;
 777                         return;
 778                 case 0x04:      /* IRQ clear / mask and Timer enable */
 779                         if(v&0x80)
 780                         {       /* IRQ flag clear */
 781                                 OPL_STATUS_RESET(OPL,0x7f);
 782                         }
 783                         else
 784                         {       /* set IRQ mask ,timer enable*/
 785                                 uint8_t st1 = v&1;
 786                                 uint8_t st2 = (v>>1)&1;
 787                                 /* IRQRST,T1MSK,t2MSK,EOSMSK,BRMSK,x,ST2,ST1 */
 788                                 OPL_STATUS_RESET(OPL,v&0x78);
 789                                 OPL_STATUSMASK_SET(OPL,((~v)&0x78)|0x01);
 790                                 /* timer 2 */
 791                                 if(OPL->st[1] != st2)
 792                                 {
 793                                         double interval = st2 ? (double)OPL->T[1]*OPL->TimerBase : 0.0;
 794                                         OPL->st[1] = st2;
 795                                         if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+1,interval);
 796                                 }
 797                                 /* timer 1 */
 798                                 if(OPL->st[0] != st1)
 799                                 {
 800                                         double interval = st1 ? (double)OPL->T[0]*OPL->TimerBase : 0.0;
 801                                         OPL->st[0] = st1;
 802                                         if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+0,interval);
 803                                 }
 804                         }
 805                         return;
 806                 }
 807                 break;
 808         case 0x20:      /* am,vib,ksr,eg type,mul */
 809                 slot = slot_array[r&0x1f];
 810                 if(slot == -1) return;
 811                 set_mul(OPL,slot,v);
 812                 return;
 813         case 0x40:
 814                 slot = slot_array[r&0x1f];
 815                 if(slot == -1) return;
 816                 set_ksl_tl(OPL,slot,v);
 817                 return;
 818         case 0x60:
 819                 slot = slot_array[r&0x1f];
 820                 if(slot == -1) return;
 821                 set_ar_dr(OPL,slot,v);
 822                 return;
 823         case 0x80:
 824                 slot = slot_array[r&0x1f];
 825                 if(slot == -1) return;
 826                 set_sl_rr(OPL,slot,v);
 827                 return;
 828         case 0xa0:
 829                 switch(r)
 830                 {
 831                 case 0xbd:
 832                         /* amsep,vibdep,r,bd,sd,tom,tc,hh */
 833                         {
 834                         uint8_t rkey = OPL->rhythm^v;
 835                         OPL->ams_table = &AMS_TABLE[v&0x80 ? AMS_ENT : 0];
 836                         OPL->vib_table = &VIB_TABLE[v&0x40 ? VIB_ENT : 0];
 837                         OPL->rhythm  = v&0x3f;
 838                         if(OPL->rhythm&0x20)
 839                         {
 840 #if 0
 841                                 usrintf_showmessage("OPL Rhythm mode select");
 842 #endif
 843                                 /* BD key on/off */
 844                                 if(rkey&0x10)
 845                                 {
 846                                         if(v&0x10)
 847                                         {
 848                                                 OPL->P_CH[6].op1_out[0] = OPL->P_CH[6].op1_out[1] = 0;
 849                                                 OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT1]);
 850                                                 OPL_KEYON(&OPL->P_CH[6].SLOT[SLOT2]);
 851                                         }
 852                                         else
 853                                         {
 854                                                 OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT1]);
 855                                                 OPL_KEYOFF(&OPL->P_CH[6].SLOT[SLOT2]);
 856                                         }
 857                                 }
 858                                 /* SD key on/off */
 859                                 if(rkey&0x08)
 860                                 {
 861                                         if(v&0x08) OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT2]);
 862                                         else       OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT2]);
 863                                 }/* TAM key on/off */
 864                                 if(rkey&0x04)
 865                                 {
 866                                         if(v&0x04) OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT1]);
 867                                         else       OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT1]);
 868                                 }
 869                                 /* TOP-CY key on/off */
 870                                 if(rkey&0x02)
 871                                 {
 872                                         if(v&0x02) OPL_KEYON(&OPL->P_CH[8].SLOT[SLOT2]);
 873                                         else       OPL_KEYOFF(&OPL->P_CH[8].SLOT[SLOT2]);
 874                                 }
 875                                 /* HH key on/off */
 876                                 if(rkey&0x01)
 877                                 {
 878                                         if(v&0x01) OPL_KEYON(&OPL->P_CH[7].SLOT[SLOT1]);
 879                                         else       OPL_KEYOFF(&OPL->P_CH[7].SLOT[SLOT1]);
 880                                 }
 881                         }
 882                         }
 883                         return;
 884                 }
 885                 /* keyon,block,fnum */
 886                 if( (r&0x0f) > 8) return;
 887                 CH = &OPL->P_CH[r&0x0f];
 888                 if(!(r&0x10))
 889                 {       /* a0-a8 */
 890                         block_fnum  = (CH->block_fnum&0x1f00) | v;
 891                 }
 892                 else
 893                 {       /* b0-b8 */
 894                         int keyon = (v>>5)&1;
 895                         block_fnum = ((v&0x1f)<<8) | (CH->block_fnum&0xff);
 896                         if(CH->keyon != keyon)
 897                         {
 898                                 if( (CH->keyon=keyon) )
 899                                 {
 900                                         CH->op1_out[0] = CH->op1_out[1] = 0;
 901                                         OPL_KEYON(&CH->SLOT[SLOT1]);
 902                                         OPL_KEYON(&CH->SLOT[SLOT2]);
 903                                 }
 904                                 else
 905                                 {
 906                                         OPL_KEYOFF(&CH->SLOT[SLOT1]);
 907                                         OPL_KEYOFF(&CH->SLOT[SLOT2]);
 908                                 }
 909                         }
 910                 }
 911                 /* update */
 912                 if(CH->block_fnum != block_fnum)
 913                 {
 914                         int blockRv = 7-(block_fnum>>10);
 915                         int fnum   = block_fnum&0x3ff;
 916                         CH->block_fnum = block_fnum;
 917
 918                         CH->ksl_base = KSL_TABLE[block_fnum>>6];
 919                         CH->fc = OPL->FN_TABLE[fnum]>>blockRv;
 920                         CH->kcode = CH->block_fnum>>9;
 921                         if( (OPL->mode&0x40) && CH->block_fnum&0x100) CH->kcode |=1;
 922                         CALC_FCSLOT(CH,&CH->SLOT[SLOT1]);
 923                         CALC_FCSLOT(CH,&CH->SLOT[SLOT2]);
 924                 }
 925                 return;
 926         case 0xc0:
 927                 /* FB,C */
 928                 if( (r&0x0f) > 8) return;
 929                 CH = &OPL->P_CH[r&0x0f];
 930                 {
 931                 int feedback = (v>>1)&7;
 932                 CH->FB   = feedback ? (8+1) - feedback : 0;
 933                 CH->CON = v&1;
 934                 set_algorithm(CH);
 935                 }
 936                 return;
 937         case 0xe0: /* wave type */
 938                 slot = slot_array[r&0x1f];
 939                 if(slot == -1) return;
 940                 CH = &OPL->P_CH[slot/2];
 941                 if(OPL->wavesel)
 942                 {
 943                         /* LOG(LOG_INF,("OPL SLOT %d wave select %d\n",slot,v&3)); */
 944                         CH->SLOT[slot&1].wavetable = &SIN_TABLE[(v&0x03)*SIN_ENT];
 945                 }
 946                 return;
 947         }
 948 }
 949
 950 /* lock/unlock for common table */
 951 static int OPL_LockTable(void)
 952 {
 953         num_lock++;
 954         if(num_lock>1) return 0;
 955         /* first time */
 956         cur_chip = NULL;
 957         /* allocate total level table (128kb space) */
 958         if( !OPLOpenTable() )
 959         {
 960                 num_lock--;
 961                 return -1;
 962         }
 963         return 0;
 964 }
 965
 966 static void OPL_UnLockTable(void)
 967 {
 968         if(num_lock) num_lock--;
 969         if(num_lock) return;
 970         /* last time */
 971         cur_chip = NULL;
 972         OPLCloseTable();
 973 }
 974
 975 /*******************************************************************************/
 976 /*              YM3812 local section                                                   */
 977 /*******************************************************************************/
 978
 979 /* ---------- update one of chip ----------- */
 980 void YM3812UpdateOne(FM_OPL *OPL, int16_t *buffer, int length)
 981 {
 982     int i;
 983         int data;
 984         int16_t *buf = buffer;
 985         uint32_t amsCnt  = OPL->amsCnt;
 986         uint32_t  vibCnt  = OPL->vibCnt;
 987         uint8_t rhythm = OPL->rhythm&0x20;
 988         OPL_CH *CH,*R_CH;
 989
 990         if( (void *)OPL != cur_chip ){
 991                 cur_chip = (void *)OPL;
 992                 /* channel pointers */
 993                 S_CH = OPL->P_CH;
 994                 E_CH = &S_CH[9];
 995                 /* rhythm slot */
 996                 SLOT7_1 = &S_CH[7].SLOT[SLOT1];
 997                 SLOT7_2 = &S_CH[7].SLOT[SLOT2];
 998                 SLOT8_1 = &S_CH[8].SLOT[SLOT1];
 999                 SLOT8_2 = &S_CH[8].SLOT[SLOT2];
1000                 /* LFO state */
1001                 amsIncr = OPL->amsIncr;
1002                 vibIncr = OPL->vibIncr;
1003                 ams_table = OPL->ams_table;
1004                 vib_table = OPL->vib_table;
1005         }
1006         R_CH = rhythm ? &S_CH[6] : E_CH;
1007     for( i=0; i < length ; i++ )
1008         {
1009                 /*            channel A         channel B         channel C      */
1010                 /* LFO */
1011                 ams = ams_table[(amsCnt+=amsIncr)>>AMS_SHIFT];
1012                 vib = vib_table[(vibCnt+=vibIncr)>>VIB_SHIFT];
1013                 outd[0] = 0;
1014                 /* FM part */
1015                 for(CH=S_CH ; CH < R_CH ; CH++)
1016                         OPL_CALC_CH(CH);
1017                 /* Rythn part */
1018                 if(rhythm)
1019                         OPL_CALC_RH(S_CH);
1020                 /* limit check */
1021                 data = Limit( outd[0] , OPL_MAXOUT, OPL_MINOUT );
1022                 /* store to sound buffer */
1023                 buf[i] = data >> OPL_OUTSB;
1024         }
1025
1026         OPL->amsCnt = amsCnt;
1027         OPL->vibCnt = vibCnt;
1028 #ifdef OPL_OUTPUT_LOG
1029         if(opl_dbg_fp)
1030         {
1031                 for(opl_dbg_chip=0;opl_dbg_chip<opl_dbg_maxchip;opl_dbg_chip++)
1032                         if( opl_dbg_opl[opl_dbg_chip] == OPL) break;
1033                 fprintf(opl_dbg_fp,"%c%c%c",0x20+opl_dbg_chip,length&0xff,length/256);
1034         }
1035 #endif
1036 }
1037
1038 /* ---------- reset one of chip ---------- */
1039 void OPLResetChip(FM_OPL *OPL)
1040 {
1041         int c,s;
1042         int i;
1043
1044         /* reset chip */
1045         OPL->mode   = 0;        /* normal mode */
1046         OPL_STATUS_RESET(OPL,0x7f);
1047         /* reset with register write */
1048         OPLWriteReg(OPL,0x01,0); /* wabesel disable */
1049         OPLWriteReg(OPL,0x02,0); /* Timer1 */
1050         OPLWriteReg(OPL,0x03,0); /* Timer2 */
1051         OPLWriteReg(OPL,0x04,0); /* IRQ mask clear */
1052         for(i = 0xff ; i >= 0x20 ; i-- ) OPLWriteReg(OPL,i,0);
1053         /* reset operator parameter */
1054         for( c = 0 ; c < OPL->max_ch ; c++ )
1055         {
1056                 OPL_CH *CH = &OPL->P_CH[c];
1057                 /* OPL->P_CH[c].PAN = OPN_CENTER; */
1058                 for(s = 0 ; s < 2 ; s++ )
1059                 {
1060                         /* wave table */
1061                         CH->SLOT[s].wavetable = &SIN_TABLE[0];
1062                         /* CH->SLOT[s].evm = ENV_MOD_RR; */
1063                         CH->SLOT[s].evc = EG_OFF;
1064                         CH->SLOT[s].eve = EG_OFF+1;
1065                         CH->SLOT[s].evs = 0;
1066                 }
1067         }
1068 }
1069
1070 /* ----------  Create one of vietual YM3812 ----------       */
1071 /* 'rate'  is sampling rate and 'bufsiz' is the size of the  */
1072 FM_OPL *OPLCreate(int clock, int rate)
1073 {
1074         char *ptr;
1075         FM_OPL *OPL;
1076         int state_size;
1077         int max_ch = 9; /* normaly 9 channels */
1078
1079         if( OPL_LockTable() ==-1) return NULL;
1080         /* allocate OPL state space */
1081         state_size  = sizeof(FM_OPL);
1082         state_size += sizeof(OPL_CH)*max_ch;
1083         /* allocate memory block */
1084         ptr = malloc(state_size);
1085         if(ptr==NULL) return NULL;
1086         /* clear */
1087         memset(ptr,0,state_size);
1088         OPL        = (FM_OPL *)ptr; ptr+=sizeof(FM_OPL);
1089         OPL->P_CH  = (OPL_CH *)ptr; ptr+=sizeof(OPL_CH)*max_ch;
1090         /* set channel state pointer */
1091         OPL->clock = clock;
1092         OPL->rate  = rate;
1093         OPL->max_ch = max_ch;
1094         /* init grobal tables */
1095         OPL_initialize(OPL);
1096         /* reset chip */
1097         OPLResetChip(OPL);
1098 #ifdef OPL_OUTPUT_LOG
1099         if(!opl_dbg_fp)
1100         {
1101                 opl_dbg_fp = fopen("opllog.opl","wb");
1102                 opl_dbg_maxchip = 0;
1103         }
1104         if(opl_dbg_fp)
1105         {
1106                 opl_dbg_opl[opl_dbg_maxchip] = OPL;
1107                 fprintf(opl_dbg_fp,"%c%c%c%c%c%c",0x00+opl_dbg_maxchip,
1108                         type,
1109                         clock&0xff,
1110                         (clock/0x100)&0xff,
1111                         (clock/0x10000)&0xff,
1112                         (clock/0x1000000)&0xff);
1113                 opl_dbg_maxchip++;
1114         }
1115 #endif
1116         return OPL;
1117 }
1118
1119 /* ----------  Destroy one of vietual YM3812 ----------       */
1120 void OPLDestroy(FM_OPL *OPL)
1121 {
1122 #ifdef OPL_OUTPUT_LOG
1123         if(opl_dbg_fp)
1124         {
1125                 fclose(opl_dbg_fp);
1126                 opl_dbg_fp = NULL;
1127         }
1128 #endif
1129         OPL_UnLockTable();
1130         free(OPL);
1131 }
1132
1133 /* ----------  Option handlers ----------       */
1134
1135 void OPLSetTimerHandler(FM_OPL *OPL,OPL_TIMERHANDLER TimerHandler,int channelOffset)
1136 {
1137         OPL->TimerHandler   = TimerHandler;
1138         OPL->TimerParam = channelOffset;
1139 }
1140
1141 /* ---------- YM3812 I/O interface ---------- */
1142 int OPLWrite(FM_OPL *OPL,int a,int v)
1143 {
1144         if( !(a&1) )
1145         {       /* address port */
1146                 OPL->address = v & 0xff;
1147         }
1148         else
1149         {       /* data port */
1150 #ifdef OPL_OUTPUT_LOG
1151         if(opl_dbg_fp)
1152         {
1153                 for(opl_dbg_chip=0;opl_dbg_chip<opl_dbg_maxchip;opl_dbg_chip++)
1154                         if( opl_dbg_opl[opl_dbg_chip] == OPL) break;
1155                 fprintf(opl_dbg_fp,"%c%c%c",0x10+opl_dbg_chip,OPL->address,v);
1156         }
1157 #endif
1158                 OPLWriteReg(OPL,OPL->address,v);
1159         }
1160         return OPL->status>>7;
1161 }
1162
1163 unsigned char OPLRead(FM_OPL *OPL,int a)
1164 {
1165         if( !(a&1) )
1166         {       /* status port */
1167                 return OPL->status & (OPL->statusmask|0x80);
1168         }
1169         /* data port */
1170         switch(OPL->address)
1171         {
1172         case 0x05: /* KeyBoard IN */
1173                 return 0;
1174 #if 0
1175         case 0x0f: /* ADPCM-DATA  */
1176                 return 0;
1177 #endif
1178         case 0x19: /* I/O DATA    */
1179                 return 0;
1180         case 0x1a: /* PCM-DATA    */
1181                 return 0;
1182         }
1183         return 0;
1184 }
1185
1186 int OPLTimerOver(FM_OPL *OPL,int c)
1187 {
1188         if( c )
1189         {       /* Timer B */
1190                 OPL_STATUS_SET(OPL,0x20);
1191         }
1192         else
1193         {       /* Timer A */
1194                 OPL_STATUS_SET(OPL,0x40);
1195                 /* CSM mode key,TL control */
1196                 if( OPL->mode & 0x80 )
1197                 {       /* CSM mode total level latch and auto key on */
1198                         int ch;
1199                         for(ch=0;ch<9;ch++)
1200                                 CSMKeyControll( &OPL->P_CH[ch] );
1201                 }
1202         }
1203         /* reload timer */
1204         if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+c,(double)OPL->T[c]*OPL->TimerBase);
1205         return OPL->status>>7;
1206 }