| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 1999,2000 Tatsuyuki Satoh |
| 5 | * Copyright (C) 2001,2002 Ben Parnell |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | /* This file has been heavily modified from the original(mostly unused |
| 23 | code was removed). If you want to use it for anything other than |
| 24 | VRC7 sound emulation, you should get the original from the AdPlug |
| 25 | source distribution or the MAME(version 0.37b16) source distribution |
| 26 | (but be careful about the different licenses). |
| 27 | - Xodnizel |
| 28 | */ |
| 29 | |
| 30 | #include <stdio.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <string.h> |
| 33 | #include <stdarg.h> |
| 34 | #include <math.h> |
| 35 | #include "mapinc.h" |
| 36 | #include "fmopl.h" |
| 37 | |
| 38 | #ifndef PI |
| 39 | #define PI 3.14159265358979323846 |
| 40 | #endif |
| 41 | |
| 42 | /* -------------------- preliminary define section --------------------- */ |
| 43 | /* attack/decay rate time rate */ |
| 44 | #define OPL_ARRATE 141280 /* RATE 4 = 2826.24ms @ 3.6MHz */ |
| 45 | #define OPL_DRRATE 1956000 /* RATE 4 = 39280.64ms @ 3.6MHz */ |
| 46 | |
| 47 | #define DELTAT_MIXING_LEVEL (1) /* DELTA-T ADPCM MIXING LEVEL */ |
| 48 | |
| 49 | #define FREQ_BITS 24 /* frequency turn */ |
| 50 | |
| 51 | /* counter bits = 20 , octerve 7 */ |
| 52 | #define FREQ_RATE (1<<(FREQ_BITS-20)) |
| 53 | #define TL_BITS (FREQ_BITS+2) |
| 54 | |
| 55 | /* final output shift , limit minimum and maximum */ |
| 56 | #define OPL_OUTSB (TL_BITS+3-16) /* OPL output final shift 16bit */ |
| 57 | #define OPL_MAXOUT (0x7fff<<OPL_OUTSB<<3) |
| 58 | #define OPL_MINOUT (-0x8000<<OPL_OUTSB<<3) |
| 59 | |
| 60 | /* -------------------- quality selection --------------------- */ |
| 61 | |
| 62 | /* sinwave entries */ |
| 63 | /* used static memory = SIN_ENT * 4 (byte) */ |
| 64 | #define SIN_ENT 2048 |
| 65 | |
| 66 | /* output level entries (envelope,sinwave) */ |
| 67 | /* envelope counter lower bits */ |
| 68 | #define ENV_BITS 16 |
| 69 | /* envelope output entries */ |
| 70 | #define EG_ENT 4096 |
| 71 | /* used dynamic memory = EG_ENT*4*4(byte)or EG_ENT*6*4(byte) */ |
| 72 | /* used static memory = EG_ENT*4 (byte) */ |
| 73 | |
| 74 | #define EG_OFF ((2*EG_ENT)<<ENV_BITS) /* OFF */ |
| 75 | #define EG_DED EG_OFF |
| 76 | #define EG_DST (EG_ENT<<ENV_BITS) /* DECAY START */ |
| 77 | #define EG_AED EG_DST |
| 78 | #define EG_AST 0 /* ATTACK START */ |
| 79 | |
| 80 | #define EG_STEP (96.0/EG_ENT) /* OPL is 0.1875 dB step */ |
| 81 | |
| 82 | /* LFO table entries */ |
| 83 | #define VIB_ENT 512 |
| 84 | #define VIB_SHIFT (32-9) |
| 85 | #define AMS_ENT 512 |
| 86 | #define AMS_SHIFT (32-9) |
| 87 | |
| 88 | #define VIB_RATE 256 |
| 89 | |
| 90 | /* -------------------- local defines , macros --------------------- */ |
| 91 | |
| 92 | /* register number to channel number , slot offset */ |
| 93 | #define SLOT1 0 |
| 94 | #define SLOT2 1 |
| 95 | |
| 96 | /* envelope phase */ |
| 97 | #define ENV_MOD_RR 0x00 |
| 98 | #define ENV_MOD_DR 0x01 |
| 99 | #define ENV_MOD_AR 0x02 |
| 100 | |
| 101 | /* -------------------- tables --------------------- */ |
| 102 | static const int slot_array[32]= |
| 103 | { |
| 104 | 0, 2, 4, 1, 3, 5,-1,-1, |
| 105 | 6, 8,10, 7, 9,11,-1,-1, |
| 106 | 12,14,16,13,15,17,-1,-1, |
| 107 | -1,-1,-1,-1,-1,-1,-1,-1 |
| 108 | }; |
| 109 | |
| 110 | /* key scale level */ |
| 111 | /* table is 3dB/OCT , DV converts this in TL step at 6dB/OCT */ |
| 112 | #define DV (EG_STEP/2) |
| 113 | static const UINT32 KSL_TABLE[8*16]= |
| 114 | { |
| 115 | /* OCT 0 */ |
| 116 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 117 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 118 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 119 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 120 | /* OCT 1 */ |
| 121 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 122 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 123 | 0.000/DV, 0.750/DV, 1.125/DV, 1.500/DV, |
| 124 | 1.875/DV, 2.250/DV, 2.625/DV, 3.000/DV, |
| 125 | /* OCT 2 */ |
| 126 | 0.000/DV, 0.000/DV, 0.000/DV, 0.000/DV, |
| 127 | 0.000/DV, 1.125/DV, 1.875/DV, 2.625/DV, |
| 128 | 3.000/DV, 3.750/DV, 4.125/DV, 4.500/DV, |
| 129 | 4.875/DV, 5.250/DV, 5.625/DV, 6.000/DV, |
| 130 | /* OCT 3 */ |
| 131 | 0.000/DV, 0.000/DV, 0.000/DV, 1.875/DV, |
| 132 | 3.000/DV, 4.125/DV, 4.875/DV, 5.625/DV, |
| 133 | 6.000/DV, 6.750/DV, 7.125/DV, 7.500/DV, |
| 134 | 7.875/DV, 8.250/DV, 8.625/DV, 9.000/DV, |
| 135 | /* OCT 4 */ |
| 136 | 0.000/DV, 0.000/DV, 3.000/DV, 4.875/DV, |
| 137 | 6.000/DV, 7.125/DV, 7.875/DV, 8.625/DV, |
| 138 | 9.000/DV, 9.750/DV,10.125/DV,10.500/DV, |
| 139 | 10.875/DV,11.250/DV,11.625/DV,12.000/DV, |
| 140 | /* OCT 5 */ |
| 141 | 0.000/DV, 3.000/DV, 6.000/DV, 7.875/DV, |
| 142 | 9.000/DV,10.125/DV,10.875/DV,11.625/DV, |
| 143 | 12.000/DV,12.750/DV,13.125/DV,13.500/DV, |
| 144 | 13.875/DV,14.250/DV,14.625/DV,15.000/DV, |
| 145 | /* OCT 6 */ |
| 146 | 0.000/DV, 6.000/DV, 9.000/DV,10.875/DV, |
| 147 | 12.000/DV,13.125/DV,13.875/DV,14.625/DV, |
| 148 | 15.000/DV,15.750/DV,16.125/DV,16.500/DV, |
| 149 | 16.875/DV,17.250/DV,17.625/DV,18.000/DV, |
| 150 | /* OCT 7 */ |
| 151 | 0.000/DV, 9.000/DV,12.000/DV,13.875/DV, |
| 152 | 15.000/DV,16.125/DV,16.875/DV,17.625/DV, |
| 153 | 18.000/DV,18.750/DV,19.125/DV,19.500/DV, |
| 154 | 19.875/DV,20.250/DV,20.625/DV,21.000/DV |
| 155 | }; |
| 156 | #undef DV |
| 157 | |
| 158 | /* sustain lebel table (3db per step) */ |
| 159 | /* 0 - 15: 0, 3, 6, 9,12,15,18,21,24,27,30,33,36,39,42,93 (dB)*/ |
| 160 | #define SC(db) (db*((3/EG_STEP)*(1<<ENV_BITS)))+EG_DST |
| 161 | static const INT32 SL_TABLE[16]={ |
| 162 | SC( 0),SC( 1),SC( 2),SC(3 ),SC(4 ),SC(5 ),SC(6 ),SC( 7), |
| 163 | SC( 8),SC( 9),SC(10),SC(11),SC(12),SC(13),SC(14),SC(31) |
| 164 | }; |
| 165 | #undef SC |
| 166 | |
| 167 | #define TL_MAX (EG_ENT*2) /* limit(tl + ksr + envelope) + sinwave */ |
| 168 | /* TotalLevel : 48 24 12 6 3 1.5 0.75 (dB) */ |
| 169 | /* TL_TABLE[ 0 to TL_MAX ] : plus section */ |
| 170 | /* TL_TABLE[ TL_MAX to TL_MAX+TL_MAX-1 ] : minus section */ |
| 171 | static INT32 *TL_TABLE; |
| 172 | |
| 173 | /* pointers to TL_TABLE with sinwave output offset */ |
| 174 | static INT32 **SIN_TABLE; |
| 175 | |
| 176 | /* LFO table */ |
| 177 | static INT32 *AMS_TABLE; |
| 178 | static INT32 *VIB_TABLE; |
| 179 | |
| 180 | /* envelope output curve table */ |
| 181 | /* attack + decay + OFF */ |
| 182 | static INT32 ENV_CURVE[2*EG_ENT+1]; |
| 183 | |
| 184 | /* multiple table */ |
| 185 | #define ML 2 |
| 186 | static const UINT32 MUL_TABLE[16]= { |
| 187 | /* 1/2, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 */ |
| 188 | 0.50*ML, 1.00*ML, 2.00*ML, 3.00*ML, 4.00*ML, 5.00*ML, 6.00*ML, 7.00*ML, |
| 189 | 8.00*ML, 9.00*ML,10.00*ML,10.00*ML,12.00*ML,12.00*ML,15.00*ML,15.00*ML |
| 190 | }; |
| 191 | #undef ML |
| 192 | |
| 193 | /* dummy attack / decay rate ( when rate == 0 ) */ |
| 194 | static INT32 RATE_0[16]= |
| 195 | {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; |
| 196 | |
| 197 | /* -------------------- static state --------------------- */ |
| 198 | |
| 199 | /* lock level of common table */ |
| 200 | static int num_lock = 0; |
| 201 | |
| 202 | /* work table */ |
| 203 | static void *cur_chip = NULL; /* current chip point */ |
| 204 | /* currenct chip state */ |
| 205 | /* static OPLSAMPLE *bufL,*bufR; */ |
| 206 | static OPL_CH *S_CH; |
| 207 | static OPL_CH *E_CH; |
| 208 | OPL_SLOT *SLOT7_1,*SLOT7_2,*SLOT8_1,*SLOT8_2; |
| 209 | |
| 210 | static INT32 outd[1]; |
| 211 | static INT32 ams; |
| 212 | static INT32 vib; |
| 213 | INT32 *ams_table; |
| 214 | INT32 *vib_table; |
| 215 | static INT32 amsIncr; |
| 216 | static INT32 vibIncr; |
| 217 | static INT32 feedback2; /* connect for SLOT 2 */ |
| 218 | |
| 219 | /* --------------------- subroutines --------------------- */ |
| 220 | |
| 221 | INLINE int Limit( int val, int max, int min ) { |
| 222 | if ( val > max ) |
| 223 | val = max; |
| 224 | else if ( val < min ) |
| 225 | val = min; |
| 226 | |
| 227 | return val; |
| 228 | } |
| 229 | |
| 230 | /* ----- key on ----- */ |
| 231 | INLINE void OPL_KEYON(OPL_SLOT *SLOT) |
| 232 | { |
| 233 | /* sin wave restart */ |
| 234 | SLOT->Cnt = 0; |
| 235 | /* set attack */ |
| 236 | SLOT->evm = ENV_MOD_AR; |
| 237 | SLOT->evs = SLOT->evsa; |
| 238 | SLOT->evc = EG_AST; |
| 239 | SLOT->eve = EG_AED; |
| 240 | } |
| 241 | /* ----- key off ----- */ |
| 242 | INLINE void OPL_KEYOFF(OPL_SLOT *SLOT) |
| 243 | { |
| 244 | if( SLOT->evm > ENV_MOD_RR) |
| 245 | { |
| 246 | /* set envelope counter from envleope output */ |
| 247 | SLOT->evm = ENV_MOD_RR; |
| 248 | if( !(SLOT->evc&EG_DST) ) |
| 249 | //SLOT->evc = (ENV_CURVE[SLOT->evc>>ENV_BITS]<<ENV_BITS) + EG_DST; |
| 250 | SLOT->evc = EG_DST; |
| 251 | SLOT->eve = EG_DED; |
| 252 | SLOT->evs = SLOT->evsr; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /* ---------- calcrate Envelope Generator & Phase Generator ---------- */ |
| 257 | /* return : envelope output */ |
| 258 | INLINE UINT32 OPL_CALC_SLOT( OPL_SLOT *SLOT ) |
| 259 | { |
| 260 | /* calcrate envelope generator */ |
| 261 | if( (SLOT->evc+=SLOT->evs) >= SLOT->eve ) |
| 262 | { |
| 263 | switch( SLOT->evm ){ |
| 264 | case ENV_MOD_AR: /* ATTACK -> DECAY1 */ |
| 265 | /* next DR */ |
| 266 | SLOT->evm = ENV_MOD_DR; |
| 267 | SLOT->evc = EG_DST; |
| 268 | SLOT->eve = SLOT->SL; |
| 269 | SLOT->evs = SLOT->evsd; |
| 270 | break; |
| 271 | case ENV_MOD_DR: /* DECAY -> SL or RR */ |
| 272 | SLOT->evc = SLOT->SL; |
| 273 | SLOT->eve = EG_DED; |
| 274 | if(SLOT->eg_typ) |
| 275 | { |
| 276 | SLOT->evs = 0; |
| 277 | } |
| 278 | else |
| 279 | { |
| 280 | SLOT->evm = ENV_MOD_RR; |
| 281 | SLOT->evs = SLOT->evsr; |
| 282 | } |
| 283 | break; |
| 284 | case ENV_MOD_RR: /* RR -> OFF */ |
| 285 | SLOT->evc = EG_OFF; |
| 286 | SLOT->eve = EG_OFF+1; |
| 287 | SLOT->evs = 0; |
| 288 | break; |
| 289 | } |
| 290 | } |
| 291 | /* calcrate envelope */ |
| 292 | return SLOT->TLL+ENV_CURVE[SLOT->evc>>ENV_BITS]+(SLOT->ams ? ams : 0); |
| 293 | } |
| 294 | |
| 295 | /* set algorythm connection */ |
| 296 | static void set_algorythm( OPL_CH *CH) |
| 297 | { |
| 298 | INT32 *carrier = &outd[0]; |
| 299 | CH->connect1 = CH->CON ? carrier : &feedback2; |
| 300 | CH->connect2 = carrier; |
| 301 | } |
| 302 | |
| 303 | /* ---------- frequency counter for operater update ---------- */ |
| 304 | INLINE void CALC_FCSLOT(OPL_CH *CH,OPL_SLOT *SLOT) |
| 305 | { |
| 306 | int ksr; |
| 307 | |
| 308 | /* frequency step counter */ |
| 309 | SLOT->Incr = CH->fc * SLOT->mul; |
| 310 | ksr = CH->kcode >> SLOT->KSR; |
| 311 | |
| 312 | if( SLOT->ksr != ksr ) |
| 313 | { |
| 314 | SLOT->ksr = ksr; |
| 315 | /* attack , decay rate recalcration */ |
| 316 | SLOT->evsa = SLOT->AR[ksr]; |
| 317 | SLOT->evsd = SLOT->DR[ksr]; |
| 318 | SLOT->evsr = SLOT->RR[ksr]; |
| 319 | } |
| 320 | SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl); |
| 321 | } |
| 322 | |
| 323 | /* set multi,am,vib,EG-TYP,KSR,mul */ |
| 324 | INLINE void set_mul(FM_OPL *OPL,int slot,int v) |
| 325 | { |
| 326 | OPL_CH *CH = &OPL->P_CH[slot/2]; |
| 327 | OPL_SLOT *SLOT = &CH->SLOT[slot&1]; |
| 328 | |
| 329 | SLOT->mul = MUL_TABLE[v&0x0f]; |
| 330 | SLOT->KSR = (v&0x10) ? 0 : 2; |
| 331 | SLOT->eg_typ = (v&0x20)>>5; |
| 332 | SLOT->vib = (v&0x40); |
| 333 | SLOT->ams = (v&0x80); |
| 334 | CALC_FCSLOT(CH,SLOT); |
| 335 | } |
| 336 | |
| 337 | /* set ksl & tl */ |
| 338 | INLINE void set_ksl_tl(FM_OPL *OPL,int slot,int v) |
| 339 | { |
| 340 | OPL_CH *CH = &OPL->P_CH[slot/2]; |
| 341 | OPL_SLOT *SLOT = &CH->SLOT[slot&1]; |
| 342 | int ksl = v>>6; /* 0 / 1.5 / 3 / 6 db/OCT */ |
| 343 | |
| 344 | // if(slot&1) |
| 345 | // if(ksl) {sprintf(errmsg,"doh");howlong=255;ksl=0;} |
| 346 | |
| 347 | SLOT->ksl = ksl ? ksl : 31; |
| 348 | // SLOT->ksl = ksl ? 3-ksl : 31; |
| 349 | SLOT->TL = (v&0x3f)*(0.75/EG_STEP); /* 0.75db step */ |
| 350 | |
| 351 | if( !(OPL->mode&0x80) ) |
| 352 | { /* not CSM latch total level */ |
| 353 | SLOT->TLL = SLOT->TL + (CH->ksl_base>>SLOT->ksl); |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | /* set attack rate & decay rate */ |
| 358 | INLINE void set_ar_dr(FM_OPL *OPL,int slot,int v) |
| 359 | { |
| 360 | OPL_CH *CH = &OPL->P_CH[slot/2]; |
| 361 | OPL_SLOT *SLOT = &CH->SLOT[slot&1]; |
| 362 | int ar = v>>4; |
| 363 | int dr = v&0x0f; |
| 364 | |
| 365 | SLOT->AR = ar ? &OPL->AR_TABLE[ar<<2] : RATE_0; |
| 366 | SLOT->evsa = SLOT->AR[SLOT->ksr]; |
| 367 | if( SLOT->evm == ENV_MOD_AR ) SLOT->evs = SLOT->evsa; |
| 368 | |
| 369 | SLOT->DR = dr ? &OPL->DR_TABLE[dr<<2] : RATE_0; |
| 370 | SLOT->evsd = SLOT->DR[SLOT->ksr]; |
| 371 | if( SLOT->evm == ENV_MOD_DR ) SLOT->evs = SLOT->evsd; |
| 372 | } |
| 373 | |
| 374 | /* set sustain level & release rate */ |
| 375 | INLINE void set_sl_rr(FM_OPL *OPL,int slot,int v) |
| 376 | { |
| 377 | OPL_CH *CH = &OPL->P_CH[slot/2]; |
| 378 | OPL_SLOT *SLOT = &CH->SLOT[slot&1]; |
| 379 | int sl = v>>4; |
| 380 | int rr = v & 0x0f; |
| 381 | |
| 382 | SLOT->SL = SL_TABLE[sl]; |
| 383 | if( SLOT->evm == ENV_MOD_DR ) SLOT->eve = SLOT->SL; |
| 384 | SLOT->RR = &OPL->DR_TABLE[rr<<2]; |
| 385 | SLOT->evsr = SLOT->RR[SLOT->ksr]; |
| 386 | if( SLOT->evm == ENV_MOD_RR ) SLOT->evs = SLOT->evsr; |
| 387 | } |
| 388 | |
| 389 | /* operator output calcrator */ |
| 390 | #define OP_OUT(slot,env,con) slot->wavetable[((slot->Cnt+con)/(0x1000000/SIN_ENT))&(SIN_ENT-1)][env] |
| 391 | /* ---------- calcrate one of channel ---------- */ |
| 392 | INLINE void OPL_CALC_CH( OPL_CH *CH ) |
| 393 | { |
| 394 | UINT32 env_out; |
| 395 | OPL_SLOT *SLOT; |
| 396 | |
| 397 | feedback2 = 0; |
| 398 | /* SLOT 1 */ |
| 399 | SLOT = &CH->SLOT[SLOT1]; |
| 400 | env_out=OPL_CALC_SLOT(SLOT); |
| 401 | if( env_out < EG_ENT-1 ) |
| 402 | { |
| 403 | /* PG */ |
| 404 | if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE); |
| 405 | else SLOT->Cnt += SLOT->Incr; |
| 406 | /* connectoion */ |
| 407 | if(CH->FB) |
| 408 | { |
| 409 | int feedback1 = (CH->op1_out[0]+CH->op1_out[1])>>CH->FB; |
| 410 | CH->op1_out[1] = CH->op1_out[0]; |
| 411 | *CH->connect1 += CH->op1_out[0] = OP_OUT(SLOT,env_out,feedback1); |
| 412 | } |
| 413 | else |
| 414 | { |
| 415 | *CH->connect1 += OP_OUT(SLOT,env_out,0); |
| 416 | } |
| 417 | }else |
| 418 | { |
| 419 | CH->op1_out[1] = CH->op1_out[0]; |
| 420 | CH->op1_out[0] = 0; |
| 421 | } |
| 422 | /* SLOT 2 */ |
| 423 | SLOT = &CH->SLOT[SLOT2]; |
| 424 | env_out=OPL_CALC_SLOT(SLOT); |
| 425 | if( env_out < EG_ENT-1 ) |
| 426 | { |
| 427 | /* PG */ |
| 428 | if(SLOT->vib) SLOT->Cnt += (SLOT->Incr*vib/VIB_RATE); |
| 429 | else SLOT->Cnt += SLOT->Incr; |
| 430 | /* connectoion */ |
| 431 | outd[0] += OP_OUT(SLOT,env_out, feedback2); |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | /* ----------- initialize time tabls ----------- */ |
| 436 | static void init_timetables( FM_OPL *OPL , int ARRATE , int DRRATE ) |
| 437 | { |
| 438 | int i; |
| 439 | double rate; |
| 440 | |
| 441 | /* make attack rate & decay rate tables */ |
| 442 | for (i = 0;i < 4;i++) OPL->AR_TABLE[i] = OPL->DR_TABLE[i] = 0; |
| 443 | for (i = 4;i <= 60;i++){ |
| 444 | rate = OPL->freqbase; /* frequency rate */ |
| 445 | if( i < 60 ) rate *= 1.0+(i&3)*0.25; /* b0-1 : x1 , x1.25 , x1.5 , x1.75 */ |
| 446 | rate *= 1<<((i>>2)-1); /* b2-5 : shift bit */ |
| 447 | rate *= (double)(EG_ENT<<ENV_BITS); |
| 448 | OPL->AR_TABLE[i] = rate / ARRATE; |
| 449 | OPL->DR_TABLE[i] = rate / DRRATE; |
| 450 | } |
| 451 | for (i = 60;i < 76;i++) |
| 452 | { |
| 453 | OPL->AR_TABLE[i] = EG_AED-1; |
| 454 | OPL->DR_TABLE[i] = OPL->DR_TABLE[60]; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* ---------- generic table initialize ---------- */ |
| 459 | static int OPLOpenTable( void ) |
| 460 | { |
| 461 | int s,t; |
| 462 | double rate; |
| 463 | int i,j; |
| 464 | double pom; |
| 465 | |
| 466 | /* allocate dynamic tables */ |
| 467 | if( (TL_TABLE = malloc(TL_MAX*2*sizeof(INT32))) == NULL) |
| 468 | return 0; |
| 469 | if( (SIN_TABLE = malloc(SIN_ENT*4 *sizeof(INT32 *))) == NULL) |
| 470 | { |
| 471 | free(TL_TABLE); |
| 472 | return 0; |
| 473 | } |
| 474 | if( (AMS_TABLE = malloc(AMS_ENT*2 *sizeof(INT32))) == NULL) |
| 475 | { |
| 476 | free(TL_TABLE); |
| 477 | free(SIN_TABLE); |
| 478 | return 0; |
| 479 | } |
| 480 | if( (VIB_TABLE = malloc(VIB_ENT*2 *sizeof(INT32))) == NULL) |
| 481 | { |
| 482 | free(TL_TABLE); |
| 483 | free(SIN_TABLE); |
| 484 | free(AMS_TABLE); |
| 485 | return 0; |
| 486 | } |
| 487 | /* make total level table */ |
| 488 | for (t = 0;t < EG_ENT-1 ;t++){ |
| 489 | rate = ((1<<TL_BITS)-1)/pow(10,EG_STEP*t/20); /* dB -> voltage */ |
| 490 | TL_TABLE[ t] = (int)rate; |
| 491 | TL_TABLE[TL_MAX+t] = -TL_TABLE[t]; |
| 492 | |
| 493 | } |
| 494 | /* fill volume off area */ |
| 495 | for ( t = EG_ENT-1; t < TL_MAX ;t++){ |
| 496 | TL_TABLE[t] = TL_TABLE[TL_MAX+t] = 0; |
| 497 | } |
| 498 | |
| 499 | /* make sinwave table (total level offet) */ |
| 500 | /* degree 0 = degree 180 = off */ |
| 501 | SIN_TABLE[0] = SIN_TABLE[SIN_ENT/2] = &TL_TABLE[EG_ENT-1]; |
| 502 | for (s = 1;s <= SIN_ENT/4;s++){ |
| 503 | pom = sin(2*PI*s/SIN_ENT); /* sin */ |
| 504 | pom = 20*log10(1/pom); /* decibel */ |
| 505 | j = pom / EG_STEP; /* TL_TABLE steps */ |
| 506 | |
| 507 | /* degree 0 - 90 , degree 180 - 90 : plus section */ |
| 508 | SIN_TABLE[ s] = SIN_TABLE[SIN_ENT/2-s] = &TL_TABLE[j]; |
| 509 | /* degree 180 - 270 , degree 360 - 270 : minus section */ |
| 510 | SIN_TABLE[SIN_ENT/2+s] = SIN_TABLE[SIN_ENT -s] = &TL_TABLE[TL_MAX+j]; |
| 511 | |
| 512 | } |
| 513 | for (s = 0;s < SIN_ENT;s++) |
| 514 | { |
| 515 | SIN_TABLE[SIN_ENT*1+s] = s<(SIN_ENT/2) ? SIN_TABLE[s] : &TL_TABLE[EG_ENT]; |
| 516 | SIN_TABLE[SIN_ENT*2+s] = SIN_TABLE[s % (SIN_ENT/2)]; |
| 517 | SIN_TABLE[SIN_ENT*3+s] = (s/(SIN_ENT/4))&1 ? &TL_TABLE[EG_ENT] : SIN_TABLE[SIN_ENT*2+s]; |
| 518 | } |
| 519 | |
| 520 | /* envelope counter -> envelope output table */ |
| 521 | for (i=0; i<EG_ENT; i++) |
| 522 | { |
| 523 | /* ATTACK curve */ |
| 524 | pom = pow( ((double)(EG_ENT-1-i)/EG_ENT) , 8 ) * EG_ENT; |
| 525 | /* if( pom >= EG_ENT ) pom = EG_ENT-1; */ |
| 526 | ENV_CURVE[i] = (int)pom; |
| 527 | /* DECAY ,RELEASE curve */ |
| 528 | ENV_CURVE[(EG_DST>>ENV_BITS)+i]= i; |
| 529 | } |
| 530 | /* off */ |
| 531 | ENV_CURVE[EG_OFF>>ENV_BITS]= EG_ENT-1; |
| 532 | /* make LFO ams table */ |
| 533 | for (i=0; i<AMS_ENT; i++) |
| 534 | { |
| 535 | pom = (1.0+sin(2*PI*i/AMS_ENT))/2; /* sin */ |
| 536 | AMS_TABLE[i] = (1.0/EG_STEP)*pom; /* 1dB */ |
| 537 | AMS_TABLE[AMS_ENT+i] = (4.8/EG_STEP)*pom; /* 4.8dB */ |
| 538 | } |
| 539 | /* make LFO vibrate table */ |
| 540 | for (i=0; i<VIB_ENT; i++) |
| 541 | { |
| 542 | /* 100cent = 1seminote = 6% ?? */ |
| 543 | pom = (double)VIB_RATE*0.06*sin(2*PI*i/VIB_ENT); /* +-100sect step */ |
| 544 | VIB_TABLE[i] = VIB_RATE + (pom*0.07); /* +- 7cent */ |
| 545 | VIB_TABLE[VIB_ENT+i] = VIB_RATE + (pom*0.14); /* +-14cent */ |
| 546 | } |
| 547 | return 1; |
| 548 | } |
| 549 | |
| 550 | |
| 551 | static void OPLCloseTable( void ) |
| 552 | { |
| 553 | free(TL_TABLE); |
| 554 | free(SIN_TABLE); |
| 555 | free(AMS_TABLE); |
| 556 | free(VIB_TABLE); |
| 557 | } |
| 558 | |
| 559 | /* CSM Key Controll */ |
| 560 | INLINE void CSMKeyControll(OPL_CH *CH) |
| 561 | { |
| 562 | OPL_SLOT *slot1 = &CH->SLOT[SLOT1]; |
| 563 | OPL_SLOT *slot2 = &CH->SLOT[SLOT2]; |
| 564 | /* all key off */ |
| 565 | OPL_KEYOFF(slot1); |
| 566 | OPL_KEYOFF(slot2); |
| 567 | /* total level latch */ |
| 568 | slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl); |
| 569 | slot1->TLL = slot1->TL + (CH->ksl_base>>slot1->ksl); |
| 570 | /* key on */ |
| 571 | CH->op1_out[0] = CH->op1_out[1] = 0; |
| 572 | OPL_KEYON(slot1); |
| 573 | OPL_KEYON(slot2); |
| 574 | } |
| 575 | |
| 576 | /* ---------- opl initialize ---------- */ |
| 577 | static void OPL_initalize(FM_OPL *OPL) |
| 578 | { |
| 579 | int fn; |
| 580 | |
| 581 | /* frequency base */ |
| 582 | OPL->freqbase = (OPL->rate) ? ((double)OPL->clock / OPL->rate) / 72 : 0; |
| 583 | /* make time tables */ |
| 584 | init_timetables( OPL , OPL_ARRATE , OPL_DRRATE ); |
| 585 | /* make fnumber -> increment counter table */ |
| 586 | for( fn=0 ; fn < 1024 ; fn++ ) |
| 587 | { |
| 588 | OPL->FN_TABLE[fn] = OPL->freqbase * fn * FREQ_RATE * (1<<7) / 2; |
| 589 | } |
| 590 | /* LFO freq.table */ |
| 591 | OPL->amsIncr = OPL->rate ? (double)AMS_ENT*(1<<AMS_SHIFT) / OPL->rate * 3.7 * ((double)OPL->clock/3600000) : 0; |
| 592 | OPL->vibIncr = OPL->rate ? (double)VIB_ENT*(1<<VIB_SHIFT) / OPL->rate * 6.4 * ((double)OPL->clock/3600000) : 0; |
| 593 | } |
| 594 | |
| 595 | /* ---------- write a OPL registers ---------- */ |
| 596 | static void OPLWriteReg(FM_OPL *OPL, int r, int v) |
| 597 | { |
| 598 | OPL_CH *CH; |
| 599 | int slot; |
| 600 | int block_fnum; |
| 601 | |
| 602 | switch(r&0xe0) |
| 603 | { |
| 604 | case 0x00: /* 00-1f:controll */ |
| 605 | switch(r&0x1f) |
| 606 | { |
| 607 | case 0x01: |
| 608 | /* wave selector enable */ |
| 609 | if(OPL->type&OPL_TYPE_WAVESEL) |
| 610 | { |
| 611 | OPL->wavesel = v&0x20; |
| 612 | if(!OPL->wavesel) |
| 613 | { |
| 614 | /* preset compatible mode */ |
| 615 | int c; |
| 616 | for(c=0;c<OPL->max_ch;c++) |
| 617 | { |
| 618 | OPL->P_CH[c].SLOT[SLOT1].wavetable = &SIN_TABLE[0]; |
| 619 | OPL->P_CH[c].SLOT[SLOT2].wavetable = &SIN_TABLE[0]; |
| 620 | } |
| 621 | } |
| 622 | } |
| 623 | return; |
| 624 | } |
| 625 | break; |
| 626 | case 0x20: /* am,vib,ksr,eg type,mul */ |
| 627 | slot = slot_array[r&0x1f]; |
| 628 | if(slot == -1) return; |
| 629 | set_mul(OPL,slot,v); |
| 630 | return; |
| 631 | case 0x40: |
| 632 | slot = slot_array[r&0x1f]; |
| 633 | if(slot == -1) return; |
| 634 | set_ksl_tl(OPL,slot,v); |
| 635 | return; |
| 636 | case 0x60: |
| 637 | slot = slot_array[r&0x1f]; |
| 638 | if(slot == -1) return; |
| 639 | set_ar_dr(OPL,slot,v); |
| 640 | return; |
| 641 | case 0x80: |
| 642 | slot = slot_array[r&0x1f]; |
| 643 | if(slot == -1) return; |
| 644 | set_sl_rr(OPL,slot,v); |
| 645 | return; |
| 646 | case 0xa0: |
| 647 | switch(r) |
| 648 | { |
| 649 | case 0xbd: |
| 650 | /* amsep,vibdep,r,bd,sd,tom,tc,hh */ |
| 651 | { |
| 652 | OPL->ams_table = &AMS_TABLE[v&0x80 ? AMS_ENT : 0]; |
| 653 | OPL->vib_table = &VIB_TABLE[v&0x40 ? VIB_ENT : 0]; |
| 654 | } |
| 655 | return; |
| 656 | } |
| 657 | /* keyon,block,fnum */ |
| 658 | if( (r&0x0f) > 8) return; |
| 659 | CH = &OPL->P_CH[r&0x0f]; |
| 660 | if(!(r&0x10)) |
| 661 | { /* a0-a8 */ |
| 662 | block_fnum = (CH->block_fnum&0x1f00) | v; |
| 663 | } |
| 664 | else |
| 665 | { /* b0-b8 */ |
| 666 | int keyon = (v>>5)&1; |
| 667 | block_fnum = ((v&0x1f)<<8) | (CH->block_fnum&0xff); |
| 668 | if(CH->keyon != keyon) |
| 669 | { |
| 670 | if( (CH->keyon=keyon) ) |
| 671 | { |
| 672 | CH->op1_out[0] = CH->op1_out[1] = 0; |
| 673 | OPL_KEYON(&CH->SLOT[SLOT1]); |
| 674 | OPL_KEYON(&CH->SLOT[SLOT2]); |
| 675 | } |
| 676 | else |
| 677 | { |
| 678 | OPL_KEYOFF(&CH->SLOT[SLOT1]); |
| 679 | OPL_KEYOFF(&CH->SLOT[SLOT2]); |
| 680 | } |
| 681 | } |
| 682 | } |
| 683 | /* update */ |
| 684 | if(CH->block_fnum != block_fnum) |
| 685 | { |
| 686 | int blockRv = 7-(block_fnum>>10); |
| 687 | int fnum = block_fnum&0x3ff; |
| 688 | CH->block_fnum = block_fnum; |
| 689 | |
| 690 | CH->ksl_base = KSL_TABLE[block_fnum>>6]; |
| 691 | CH->fc = OPL->FN_TABLE[fnum]>>blockRv; |
| 692 | CH->kcode = CH->block_fnum>>9; |
| 693 | if( (OPL->mode&0x40) && CH->block_fnum&0x100) CH->kcode |=1; |
| 694 | CALC_FCSLOT(CH,&CH->SLOT[SLOT1]); |
| 695 | CALC_FCSLOT(CH,&CH->SLOT[SLOT2]); |
| 696 | } |
| 697 | return; |
| 698 | case 0xc0: |
| 699 | /* FB,C */ |
| 700 | if( (r&0x0f) > 8) return; |
| 701 | CH = &OPL->P_CH[r&0x0f]; |
| 702 | { |
| 703 | int feedback = (v>>1)&7; |
| 704 | CH->FB = feedback ? (8+1) - feedback : 0; |
| 705 | CH->CON = v&1; |
| 706 | set_algorythm(CH); |
| 707 | } |
| 708 | return; |
| 709 | case 0xe0: /* wave type */ |
| 710 | slot = slot_array[r&0x1f]; |
| 711 | if(slot == -1) return; |
| 712 | CH = &OPL->P_CH[slot/2]; |
| 713 | if(OPL->wavesel) |
| 714 | { |
| 715 | CH->SLOT[slot&1].wavetable = &SIN_TABLE[(v&0x03)*SIN_ENT]; |
| 716 | } |
| 717 | return; |
| 718 | } |
| 719 | } |
| 720 | |
| 721 | /* lock/unlock for common table */ |
| 722 | static int OPL_LockTable(void) |
| 723 | { |
| 724 | num_lock++; |
| 725 | if(num_lock>1) return 0; |
| 726 | /* first time */ |
| 727 | cur_chip = NULL; |
| 728 | /* allocate total level table (128kb space) */ |
| 729 | if( !OPLOpenTable() ) |
| 730 | { |
| 731 | num_lock--; |
| 732 | return -1; |
| 733 | } |
| 734 | return 0; |
| 735 | } |
| 736 | |
| 737 | static void OPL_UnLockTable(void) |
| 738 | { |
| 739 | if(num_lock) num_lock--; |
| 740 | if(num_lock) return; |
| 741 | /* last time */ |
| 742 | cur_chip = NULL; |
| 743 | OPLCloseTable(); |
| 744 | } |
| 745 | |
| 746 | /*******************************************************************************/ |
| 747 | /* YM3812 local section */ |
| 748 | /*******************************************************************************/ |
| 749 | |
| 750 | /* ---------- update one of chip ----------- */ |
| 751 | void YM3812UpdateOne(FM_OPL *OPL, UINT32 *buffer, int length) |
| 752 | { |
| 753 | int i; |
| 754 | UINT32 *buf = buffer; |
| 755 | UINT32 amsCnt = OPL->amsCnt; |
| 756 | UINT32 vibCnt = OPL->vibCnt; |
| 757 | OPL_CH *CH,*R_CH; |
| 758 | |
| 759 | if( (void *)OPL != cur_chip ){ |
| 760 | cur_chip = (void *)OPL; |
| 761 | /* channel pointers */ |
| 762 | S_CH = OPL->P_CH; |
| 763 | E_CH = &S_CH[6]; |
| 764 | /* LFO state */ |
| 765 | amsIncr = OPL->amsIncr; |
| 766 | vibIncr = OPL->vibIncr; |
| 767 | ams_table = OPL->ams_table; |
| 768 | vib_table = OPL->vib_table; |
| 769 | } |
| 770 | R_CH = E_CH; |
| 771 | for( i=0; i < length ; i++ ) |
| 772 | { |
| 773 | /* channel A channel B channel C */ |
| 774 | /* LFO */ |
| 775 | ams = ams_table[(amsCnt+=amsIncr)>>AMS_SHIFT]; |
| 776 | vib = vib_table[(vibCnt+=vibIncr)>>VIB_SHIFT]; |
| 777 | outd[0] = 0; |
| 778 | /* FM part */ |
| 779 | for(CH=S_CH ; CH < R_CH ; CH++) |
| 780 | OPL_CALC_CH(CH); |
| 781 | /* limit check */ |
| 782 | //data = Limit( outd[0] , OPL_MAXOUT, OPL_MINOUT ); |
| 783 | /* store to sound buffer */ |
| 784 | { |
| 785 | int32 d=outd[0]>>OPL_OUTSB; |
| 786 | if(d<-32768) d=-32768; |
| 787 | d+=32768; |
| 788 | buf[i] += d; |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | OPL->amsCnt = amsCnt; |
| 793 | OPL->vibCnt = vibCnt; |
| 794 | } |
| 795 | |
| 796 | /* ---------- reset one of chip ---------- */ |
| 797 | void OPLResetChip(FM_OPL *OPL) |
| 798 | { |
| 799 | int c,s; |
| 800 | int i; |
| 801 | |
| 802 | /* reset chip */ |
| 803 | OPL->mode = 0; /* normal mode */ |
| 804 | |
| 805 | /* reset with register write */ |
| 806 | OPLWriteReg(OPL,0x01,0); /* wabesel disable */ |
| 807 | for(i = 0xff ; i >= 0x20 ; i-- ) OPLWriteReg(OPL,i,0); |
| 808 | /* reset OPerator paramater */ |
| 809 | for( c = 0 ; c < OPL->max_ch ; c++ ) |
| 810 | { |
| 811 | OPL_CH *CH = &OPL->P_CH[c]; |
| 812 | /* OPL->P_CH[c].PAN = OPN_CENTER; */ |
| 813 | for(s = 0 ; s < 2 ; s++ ) |
| 814 | { |
| 815 | /* wave table */ |
| 816 | CH->SLOT[s].wavetable = &SIN_TABLE[0]; |
| 817 | /* CH->SLOT[s].evm = ENV_MOD_RR; */ |
| 818 | CH->SLOT[s].evc = EG_OFF; |
| 819 | CH->SLOT[s].eve = EG_OFF+1; |
| 820 | CH->SLOT[s].evs = 0; |
| 821 | } |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | /* ---------- Create one of vietual YM3812 ---------- */ |
| 826 | /* 'rate' is sampling rate and 'bufsiz' is the size of the */ |
| 827 | FM_OPL *OPLCreate(int type, int clock, int rate) |
| 828 | { |
| 829 | char *ptr; |
| 830 | FM_OPL *OPL; |
| 831 | int state_size; |
| 832 | int max_ch = 9; /* normaly 9 channels */ |
| 833 | |
| 834 | if( OPL_LockTable() ==-1) return NULL; |
| 835 | /* allocate OPL state space */ |
| 836 | state_size = sizeof(FM_OPL); |
| 837 | state_size += sizeof(OPL_CH)*max_ch; |
| 838 | |
| 839 | /* allocate memory block */ |
| 840 | ptr = malloc(state_size); |
| 841 | if(ptr==NULL) return NULL; |
| 842 | /* clear */ |
| 843 | memset(ptr,0,state_size); |
| 844 | OPL = (FM_OPL *)ptr; ptr+=sizeof(FM_OPL); |
| 845 | OPL->P_CH = (OPL_CH *)ptr; ptr+=sizeof(OPL_CH)*max_ch; |
| 846 | |
| 847 | /* set channel state pointer */ |
| 848 | OPL->type = type; |
| 849 | OPL->clock = clock; |
| 850 | OPL->rate = rate; |
| 851 | OPL->max_ch = max_ch; |
| 852 | /* init grobal tables */ |
| 853 | OPL_initalize(OPL); |
| 854 | /* reset chip */ |
| 855 | OPLResetChip(OPL); |
| 856 | |
| 857 | return OPL; |
| 858 | } |
| 859 | |
| 860 | /* ---------- Destroy one of vietual YM3812 ---------- */ |
| 861 | void OPLDestroy(FM_OPL *OPL) |
| 862 | { |
| 863 | OPL_UnLockTable(); |
| 864 | free(OPL); |
| 865 | } |
| 866 | |
| 867 | /* ---------- YM3812 I/O interface ---------- */ |
| 868 | void OPLWrite(FM_OPL *OPL,UINT8 a,UINT8 v) |
| 869 | { |
| 870 | OPLWriteReg(OPL,a,v); |
| 871 | } |