| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2002 Ben Parnell |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | |
| 21 | /********************************************************/ |
| 22 | /******* sound.c */ |
| 23 | /******* */ |
| 24 | /******* Sound emulation code and waveform synthesis */ |
| 25 | /******* routines. A few ideas were inspired */ |
| 26 | /******* by code from Marat Fayzullin's EMUlib */ |
| 27 | /******* */ |
| 28 | /********************************************************/ |
| 29 | |
| 30 | #include <stdlib.h> |
| 31 | #include <stdio.h> |
| 32 | |
| 33 | #include <string.h> |
| 34 | |
| 35 | #include "types.h" |
| 36 | #include "x6502.h" |
| 37 | |
| 38 | #include "fce.h" |
| 39 | #include "svga.h" |
| 40 | #include "sound.h" |
| 41 | |
| 42 | uint32 Wave[2048+512]; |
| 43 | int16 WaveFinalMono[2048+512]; |
| 44 | |
| 45 | EXPSOUND GameExpSound={0,0,0,0,0,0}; |
| 46 | |
| 47 | uint8 trimode=0; |
| 48 | uint8 tricoop=0; |
| 49 | uint8 PSG[0x18]; |
| 50 | |
| 51 | uint8 decvolume[3]; |
| 52 | uint8 realvolume[3]; |
| 53 | |
| 54 | static int32 count[5]; |
| 55 | static int32 sqacc[2]={0,0}; |
| 56 | uint8 sqnon=0; |
| 57 | |
| 58 | uint32 soundtsoffs=0; |
| 59 | |
| 60 | #undef printf |
| 61 | uint16 nreg; |
| 62 | |
| 63 | static int32 lengthcount[4]; |
| 64 | |
| 65 | extern int soundvol; |
| 66 | |
| 67 | static const uint8 Slengthtable[0x20]= |
| 68 | { |
| 69 | 0x5,0x7f,0xA,0x1,0x14,0x2,0x28,0x3,0x50,0x4,0x1E,0x5,0x7,0x6,0x0E,0x7, |
| 70 | 0x6,0x08,0xC,0x9,0x18,0xa,0x30,0xb,0x60,0xc,0x24,0xd,0x8,0xe,0x10,0xf |
| 71 | }; |
| 72 | |
| 73 | static uint32 lengthtable[0x20]; |
| 74 | |
| 75 | static const uint32 SNoiseFreqTable[0x10]= |
| 76 | { |
| 77 | 2,4,8,0x10,0x20,0x30,0x40,0x50,0x65,0x7f,0xbe,0xfe,0x17d,0x1fc,0x3f9,0x7f2 |
| 78 | }; |
| 79 | static uint32 NoiseFreqTable[0x10]; |
| 80 | |
| 81 | int32 nesincsize; |
| 82 | uint32 soundtsinc; |
| 83 | uint32 soundtsi; |
| 84 | |
| 85 | |
| 86 | static const uint8 NTSCPCMTable[0x10]= |
| 87 | { |
| 88 | 0xd6,0xbe,0xaa,0xa0,0x8f,0x7f,0x71,0x6b, |
| 89 | 0x5f,0x50,0x47,0x40,0x35,0x2a,0x24,0x1b |
| 90 | }; |
| 91 | |
| 92 | static const uint8 PALPCMTable[0x10]= // These values are just guessed. |
| 93 | { |
| 94 | 0xc6,0xb0,0x9d,0x94,0x84,0x75,0x68,0x63, |
| 95 | 0x58,0x4a,0x41,0x3b,0x31,0x27,0x21,0x19 |
| 96 | }; |
| 97 | |
| 98 | uint32 PSG_base; |
| 99 | |
| 100 | // $4010 - Frequency |
| 101 | // $4011 - Actual data outputted |
| 102 | // $4012 - Address register: $c000 + V*64 |
| 103 | // $4013 - Size register: Size in bytes = (V+1)*64 |
| 104 | |
| 105 | |
| 106 | static int32 PCMacc=0; |
| 107 | static int PCMfreq; |
| 108 | int32 PCMIRQCount; |
| 109 | uint8 PCMBitIndex=0; |
| 110 | uint32 PCMAddressIndex=0; |
| 111 | int32 PCMSizeIndex=0; |
| 112 | uint8 PCMBuffer=0; |
| 113 | int vdis=0; |
| 114 | |
| 115 | static void Dummyfunc(int end) {}; |
| 116 | |
| 117 | static void (*DoNoise)(int end)=Dummyfunc; |
| 118 | static void (*DoTriangle)(int end)=Dummyfunc; |
| 119 | static void (*DoPCM)(int end)=Dummyfunc; |
| 120 | static void (*DoSQ1)(int end)=Dummyfunc; |
| 121 | static void (*DoSQ2)(int end)=Dummyfunc; |
| 122 | |
| 123 | static void CalcDPCMIRQ(void) |
| 124 | { |
| 125 | uint32 freq; |
| 126 | uint32 honk; |
| 127 | uint32 cycles; |
| 128 | |
| 129 | if(PAL) |
| 130 | freq=(PALPCMTable[PSG[0x10]&0xF]<<4); |
| 131 | else |
| 132 | freq=(NTSCPCMTable[PSG[0x10]&0xF]<<4); |
| 133 | |
| 134 | cycles=(((PSG[0x13]<<4)+1)); |
| 135 | cycles*=freq/14; |
| 136 | honk=((PSG[0x13]<<4)+1)*freq; |
| 137 | honk-=cycles; |
| 138 | //if(PAL) honk/=107; |
| 139 | //else honk/=(double)113.66666666; |
| 140 | PCMIRQCount=honk*48; |
| 141 | //PCMIRQCount=honk*3; //180; |
| 142 | //if(PAL) PCMIRQCount*=.93; |
| 143 | vdis=0; |
| 144 | } |
| 145 | |
| 146 | static void PrepDPCM() |
| 147 | { |
| 148 | PCMAddressIndex=0x4000+(PSG[0x12]<<6); |
| 149 | PCMSizeIndex=(PSG[0x13]<<4)+1; |
| 150 | PCMBitIndex=0; |
| 151 | //PCMBuffer=ARead[0x8000+PCMAddressIndex](0x8000+PCMAddressIndex); |
| 152 | if(PAL) |
| 153 | PCMfreq=PALPCMTable[PSG[0x10]&0xF]; |
| 154 | else |
| 155 | PCMfreq=NTSCPCMTable[PSG[0x10]&0xF]; |
| 156 | PCMacc=PCMfreq<<18; |
| 157 | } |
| 158 | |
| 159 | uint8 sweepon[2]={0,0}; |
| 160 | int32 curfreq[2]={0,0}; |
| 161 | |
| 162 | |
| 163 | uint8 SIRQStat=0; |
| 164 | |
| 165 | uint8 SweepCount[2]; |
| 166 | uint8 DecCountTo1[3]; |
| 167 | |
| 168 | uint8 fcnt=0; |
| 169 | int32 fhcnt=0; |
| 170 | int32 fhinc; |
| 171 | |
| 172 | static uint8 laster; |
| 173 | |
| 174 | /* Instantaneous? Maybe the new freq value is being calculated all of the time... */ |
| 175 | static int FASTAPASS(2) CheckFreq(uint32 cf, uint8 sr) |
| 176 | { |
| 177 | uint32 mod; |
| 178 | if(!(sr&0x8)) |
| 179 | { |
| 180 | mod=cf>>(sr&7); |
| 181 | if((mod+cf)&0x800) |
| 182 | return(0); |
| 183 | } |
| 184 | return(1); |
| 185 | } |
| 186 | |
| 187 | static DECLFW(Write0x11) |
| 188 | { |
| 189 | DoPCM(0); |
| 190 | PSG[0x11]=V&0x7F; |
| 191 | } |
| 192 | |
| 193 | static uint8 DutyCount[2]={0,0}; |
| 194 | |
| 195 | static DECLFW(Write_PSG) |
| 196 | { |
| 197 | //if((A>=0x4004 && A<=0x4007) || A==0x4015) |
| 198 | //printf("$%04x:$%02x, %d\n",A,V,SOUNDTS); |
| 199 | A&=0x1f; |
| 200 | switch(A) |
| 201 | { |
| 202 | case 0x0: |
| 203 | DoSQ1(0); |
| 204 | if(V&0x10) |
| 205 | realvolume[0]=V&0xF; |
| 206 | break; |
| 207 | case 0x1: |
| 208 | sweepon[0]=V&0x80; |
| 209 | break; |
| 210 | case 0x2: |
| 211 | DoSQ1(0); |
| 212 | curfreq[0]&=0xFF00; |
| 213 | curfreq[0]|=V; |
| 214 | break; |
| 215 | case 0x3: |
| 216 | if(PSG[0x15]&1) |
| 217 | { |
| 218 | DoSQ1(0); |
| 219 | lengthcount[0]=lengthtable[(V>>3)&0x1f]; |
| 220 | sqnon|=1; |
| 221 | } |
| 222 | sweepon[0]=PSG[1]&0x80; |
| 223 | curfreq[0]=PSG[0x2]|((V&7)<<8); |
| 224 | decvolume[0]=0xF; |
| 225 | DecCountTo1[0]=(PSG[0]&0xF)+1; |
| 226 | SweepCount[0]=((PSG[0x1]>>4)&7)+1; |
| 227 | DutyCount[0]=0; |
| 228 | sqacc[0]=((int32)curfreq[0]+1)<<18; |
| 229 | break; |
| 230 | |
| 231 | case 0x4: |
| 232 | DoSQ2(0); |
| 233 | if(V&0x10) |
| 234 | realvolume[1]=V&0xF; |
| 235 | break; |
| 236 | case 0x5: |
| 237 | sweepon[1]=V&0x80; |
| 238 | break; |
| 239 | case 0x6: |
| 240 | DoSQ2(0); |
| 241 | curfreq[1]&=0xFF00; |
| 242 | curfreq[1]|=V; |
| 243 | break; |
| 244 | case 0x7: |
| 245 | if(PSG[0x15]&2) |
| 246 | { |
| 247 | DoSQ2(0); |
| 248 | lengthcount[1]=lengthtable[(V>>3)&0x1f]; |
| 249 | sqnon|=2; |
| 250 | } |
| 251 | sweepon[1]=PSG[0x5]&0x80; |
| 252 | curfreq[1]=PSG[0x6]|((V&7)<<8); |
| 253 | decvolume[1]=0xF; |
| 254 | DecCountTo1[1]=(PSG[0x4]&0xF)+1; |
| 255 | SweepCount[1]=((PSG[0x5]>>4)&7)+1; |
| 256 | DutyCount[1]=0; |
| 257 | sqacc[1]=((int32)curfreq[1]+1)<<18; |
| 258 | break; |
| 259 | case 0x8: |
| 260 | DoTriangle(0); |
| 261 | if(laster&0x80) |
| 262 | { |
| 263 | tricoop=V&0x7F; |
| 264 | trimode=V&0x80; |
| 265 | } |
| 266 | if(!(V&0x7F)) |
| 267 | tricoop=0; |
| 268 | laster=V&0x80; |
| 269 | break; |
| 270 | case 0xa:DoTriangle(0); |
| 271 | break; |
| 272 | case 0xb: |
| 273 | if(PSG[0x15]&0x4) |
| 274 | { |
| 275 | DoTriangle(0); |
| 276 | sqnon|=4; |
| 277 | lengthcount[2]=lengthtable[(V>>3)&0x1f]; |
| 278 | } |
| 279 | laster=0x80; |
| 280 | tricoop=PSG[0x8]&0x7f; |
| 281 | trimode=PSG[0x8]&0x80; |
| 282 | break; |
| 283 | case 0xC:DoNoise(0); |
| 284 | if(V&0x10) |
| 285 | realvolume[2]=V&0xF; |
| 286 | break; |
| 287 | case 0xE:DoNoise(0);break; |
| 288 | case 0xF: |
| 289 | if(PSG[0x15]&8) |
| 290 | { |
| 291 | DoNoise(0); |
| 292 | sqnon|=8; |
| 293 | lengthcount[3]=lengthtable[(V>>3)&0x1f]; |
| 294 | } |
| 295 | decvolume[2]=0xF; |
| 296 | DecCountTo1[2]=(PSG[0xC]&0xF)+1; |
| 297 | break; |
| 298 | case 0x10:DoPCM(0); |
| 299 | if(!(V&0x80)) |
| 300 | X6502_IRQEnd(FCEU_IQDPCM); |
| 301 | break; |
| 302 | case 0x15: |
| 303 | { |
| 304 | int t=V^PSG[0x15]; |
| 305 | |
| 306 | if(t&1) |
| 307 | DoSQ1(0); |
| 308 | if(t&2) |
| 309 | DoSQ2(0); |
| 310 | if(t&4) |
| 311 | DoTriangle(0); |
| 312 | if(t&8) |
| 313 | DoNoise(0); |
| 314 | if(t&0x10) |
| 315 | DoPCM(0); |
| 316 | sqnon&=V; |
| 317 | if(V&0x10) |
| 318 | { |
| 319 | if(!(PSG[0x15]&0x10)) |
| 320 | { |
| 321 | PrepDPCM(); |
| 322 | CalcDPCMIRQ(); |
| 323 | } |
| 324 | else if(vdis) |
| 325 | CalcDPCMIRQ(); |
| 326 | } |
| 327 | else |
| 328 | PCMIRQCount=0; |
| 329 | X6502_IRQEnd(FCEU_IQDPCM); |
| 330 | } |
| 331 | break; |
| 332 | } |
| 333 | PSG[A]=V; |
| 334 | } |
| 335 | |
| 336 | DECLFR(Read_PSG) |
| 337 | { |
| 338 | uint8 ret; |
| 339 | if(PSG[0x15]&0x10) |
| 340 | DoPCM(0); |
| 341 | ret=(PSG[0x15]&(sqnon|0x10))|SIRQStat; |
| 342 | SIRQStat&=~0x40; |
| 343 | X6502_IRQEnd(/*FCEU_IQDPCM|*/FCEU_IQFCOUNT); |
| 344 | return ret; |
| 345 | } |
| 346 | |
| 347 | DECLFR(Read_PSGDummy) |
| 348 | { |
| 349 | uint8 ret; |
| 350 | |
| 351 | ret=(PSG[0x15]&sqnon)|SIRQStat; |
| 352 | SIRQStat&=~0x40; |
| 353 | X6502_IRQEnd(/*FCEU_IQDPCM|*/FCEU_IQFCOUNT); |
| 354 | return ret; |
| 355 | } |
| 356 | |
| 357 | static void FASTAPASS(1) FrameSoundStuff(int V) |
| 358 | { |
| 359 | int P; |
| 360 | uint32 end = (SOUNDTS<<16)/soundtsinc; |
| 361 | |
| 362 | DoSQ1(end); |
| 363 | DoSQ2(end); |
| 364 | DoNoise(end); |
| 365 | |
| 366 | switch((V&1)) |
| 367 | { |
| 368 | case 1: /* Envelope decay, linear counter, length counter, freq sweep */ |
| 369 | if(PSG[0x15]&4 && sqnon&4) |
| 370 | if(!(PSG[8]&0x80)) |
| 371 | { |
| 372 | if(lengthcount[2]>0) |
| 373 | { |
| 374 | lengthcount[2]--; |
| 375 | if(lengthcount[2]<=0) |
| 376 | { |
| 377 | DoTriangle(0); |
| 378 | sqnon&=~4; |
| 379 | } |
| 380 | } |
| 381 | } |
| 382 | |
| 383 | for(P=0;P<2;P++) |
| 384 | { |
| 385 | if(PSG[0x15]&(P+1) && sqnon&(P+1)) |
| 386 | { |
| 387 | if(!(PSG[P<<2]&0x20)) |
| 388 | { |
| 389 | if(lengthcount[P]>0) |
| 390 | { |
| 391 | lengthcount[P]--; |
| 392 | if(lengthcount[P]<=0) |
| 393 | { |
| 394 | sqnon&=~(P+1); |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | } |
| 399 | /* Frequency Sweep Code Here */ |
| 400 | /* xxxx 0000 */ |
| 401 | /* xxxx = hz. 120/(x+1)*/ |
| 402 | if(sweepon[P]) |
| 403 | { |
| 404 | int32 mod=0; |
| 405 | |
| 406 | if(SweepCount[P]>0) SweepCount[P]--; |
| 407 | if(SweepCount[P]<=0) |
| 408 | { |
| 409 | SweepCount[P]=((PSG[(P<<2)+0x1]>>4)&7)+1; //+1; |
| 410 | { |
| 411 | if(PSG[(P<<2)+0x1]&0x8) |
| 412 | { |
| 413 | mod-=(P^1)+((curfreq[P])>>(PSG[(P<<2)+0x1]&7)); |
| 414 | |
| 415 | if(curfreq[P] && (PSG[(P<<2)+0x1]&7)/* && sweepon[P]&0x80*/) |
| 416 | { |
| 417 | curfreq[P]+=mod; |
| 418 | } |
| 419 | } |
| 420 | else |
| 421 | { |
| 422 | mod=curfreq[P]>>(PSG[(P<<2)+0x1]&7); |
| 423 | if((mod+curfreq[P])&0x800) |
| 424 | { |
| 425 | sweepon[P]=0; |
| 426 | curfreq[P]=0; |
| 427 | } |
| 428 | else |
| 429 | { |
| 430 | if(curfreq[P] && (PSG[(P<<2)+0x1]&7)/* && sweepon[P]&0x80*/) |
| 431 | { |
| 432 | curfreq[P]+=mod; |
| 433 | } |
| 434 | } |
| 435 | } |
| 436 | } |
| 437 | } |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | if(PSG[0x15]&0x8 && sqnon&8) |
| 442 | { |
| 443 | if(!(PSG[0xC]&0x20)) |
| 444 | { |
| 445 | if(lengthcount[3]>0) |
| 446 | { |
| 447 | lengthcount[3]--; |
| 448 | if(lengthcount[3]<=0) |
| 449 | { |
| 450 | sqnon&=~8; |
| 451 | } |
| 452 | } |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | case 0: /* Envelope decay + linear counter */ |
| 457 | if(!trimode) |
| 458 | { |
| 459 | laster=0; |
| 460 | if(tricoop) |
| 461 | { |
| 462 | if(tricoop==1) DoTriangle(0); |
| 463 | tricoop--; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | for(P=0;P<2;P++) |
| 468 | { |
| 469 | if(DecCountTo1[P]>0) DecCountTo1[P]--; |
| 470 | if(DecCountTo1[P]<=0) |
| 471 | { |
| 472 | DecCountTo1[P]=(PSG[P<<2]&0xF)+1; |
| 473 | if(decvolume[P] || PSG[P<<2]&0x20) |
| 474 | { |
| 475 | decvolume[P]--; |
| 476 | /* Step from 0 to full volume seems to take twice as long |
| 477 | as the other steps. I don't know if this is the correct |
| 478 | way to double its length, though(or if it even matters). |
| 479 | */ |
| 480 | if((PSG[P<<2]&0x20) && (decvolume[P]==0)) |
| 481 | DecCountTo1[P]<<=1; |
| 482 | decvolume[P]&=15; |
| 483 | } |
| 484 | } |
| 485 | if(!(PSG[P<<2]&0x10)) |
| 486 | realvolume[P]=decvolume[P]; |
| 487 | } |
| 488 | |
| 489 | if(DecCountTo1[2]>0) DecCountTo1[2]--; |
| 490 | if(DecCountTo1[2]<=0) |
| 491 | { |
| 492 | DecCountTo1[2]=(PSG[0xC]&0xF)+1; |
| 493 | if(decvolume[2] || PSG[0xC]&0x20) |
| 494 | { |
| 495 | decvolume[2]--; |
| 496 | /* Step from 0 to full volume seems to take twice as long |
| 497 | as the other steps. I don't know if this is the correct |
| 498 | way to double its length, though(or if it even matters). |
| 499 | */ |
| 500 | if((PSG[0xC]&0x20) && (decvolume[2]==0)) |
| 501 | DecCountTo1[2]<<=1; |
| 502 | decvolume[2]&=15; |
| 503 | } |
| 504 | } |
| 505 | if(!(PSG[0xC]&0x10)) |
| 506 | realvolume[2]=decvolume[2]; |
| 507 | |
| 508 | break; |
| 509 | } |
| 510 | |
| 511 | } |
| 512 | |
| 513 | void FrameSoundUpdate(void) |
| 514 | { |
| 515 | // Linear counter: Bit 0-6 of $4008 |
| 516 | // Length counter: Bit 4-7 of $4003, $4007, $400b, $400f |
| 517 | |
| 518 | if(fcnt==3) |
| 519 | { |
| 520 | if(PSG[0x17]&0x80) |
| 521 | fhcnt+=fhinc; |
| 522 | if(!(PSG[0x17]&0xC0)) |
| 523 | { |
| 524 | SIRQStat|=0x40; |
| 525 | X6502_IRQBegin(FCEU_IQFCOUNT); |
| 526 | } |
| 527 | } |
| 528 | //if(SIRQStat&0x40) X6502_IRQBegin(FCEU_IQFCOUNT); |
| 529 | FrameSoundStuff(fcnt); |
| 530 | fcnt=(fcnt+1)&3; |
| 531 | } |
| 532 | |
| 533 | static uint32 ChannelBC[5]; |
| 534 | |
| 535 | static uint32 RectAmp[2][8]; |
| 536 | |
| 537 | static void FASTAPASS(1) CalcRectAmp(int P) |
| 538 | { |
| 539 | static int tal[4]={1,2,4,6}; |
| 540 | int V; |
| 541 | int x; |
| 542 | uint32 *b=RectAmp[P]; |
| 543 | int m; |
| 544 | |
| 545 | //if(PSG[P<<2]&0x10) |
| 546 | V=realvolume[P]<<4; |
| 547 | //V=(PSG[P<<2]&15)<<4; |
| 548 | //else |
| 549 | // V=decvolume[P]<<4; |
| 550 | m=tal[(PSG[P<<2]&0xC0)>>6]; |
| 551 | for(x=0;x<m;x++,b++) |
| 552 | *b=0; |
| 553 | for(;x<8;x++,b++) |
| 554 | *b=V; |
| 555 | } |
| 556 | |
| 557 | static void RDoPCM(int32 end) |
| 558 | { |
| 559 | int32 V; |
| 560 | int32 start; |
| 561 | int32 freq; |
| 562 | uint32 out=PSG[0x11]<<3; |
| 563 | |
| 564 | start=ChannelBC[4]; |
| 565 | if(end==0) end=(SOUNDTS<<16)/soundtsinc; |
| 566 | if(end<=start) return; |
| 567 | ChannelBC[4]=end; |
| 568 | |
| 569 | if(PSG[0x15]&0x10) |
| 570 | { |
| 571 | freq=PCMfreq; |
| 572 | freq<<=18; |
| 573 | |
| 574 | for(V=start;V<end;V++) |
| 575 | { |
| 576 | PCMacc-=nesincsize; |
| 577 | if(PCMacc<=0) |
| 578 | { |
| 579 | if(!PCMBitIndex) |
| 580 | { |
| 581 | PCMSizeIndex--; |
| 582 | if(!PCMSizeIndex) |
| 583 | { |
| 584 | if(PSG[0x10]&0x40) |
| 585 | PrepDPCM(); |
| 586 | else |
| 587 | { |
| 588 | PSG[0x15]&=~0x10; |
| 589 | for(;V<end;V++) |
| 590 | Wave[V>>4]+=PSG[0x11]<<3; |
| 591 | goto endopcmo; |
| 592 | } |
| 593 | } |
| 594 | else |
| 595 | { |
| 596 | PCMBuffer=ARead[0x8000+PCMAddressIndex](0x8000+PCMAddressIndex); |
| 597 | PCMAddressIndex=(PCMAddressIndex+1)&0x7fff; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | { |
| 602 | int t=(((PCMBuffer>>PCMBitIndex)&1)<<2)-2; |
| 603 | uint8 bah=PSG[0x11]; |
| 604 | |
| 605 | PCMacc+=freq; |
| 606 | PSG[0x11]+=t; |
| 607 | if(PSG[0x11]&0x80) |
| 608 | PSG[0x11]=bah; |
| 609 | else |
| 610 | out=PSG[0x11]<<3; |
| 611 | } |
| 612 | PCMBitIndex=(PCMBitIndex+1)&7; |
| 613 | } |
| 614 | Wave[V>>4]+=out; //(PSG[0x11]-64)<<3; |
| 615 | } |
| 616 | } |
| 617 | else |
| 618 | { |
| 619 | if((end-start)>64) |
| 620 | { |
| 621 | for(V=start;V<=(start|15);V++) |
| 622 | Wave[V>>4]+=out; |
| 623 | out<<=4; |
| 624 | for(V=(start>>4)+1;V<(end>>4);V++) |
| 625 | Wave[V]+=out; |
| 626 | out>>=4; |
| 627 | for(V=end&(~15);V<end;V++) |
| 628 | Wave[V>>4]+=out; |
| 629 | } |
| 630 | else |
| 631 | for(V=start;V<end;V++) |
| 632 | Wave[V>>4]+=out; |
| 633 | } |
| 634 | endopcmo:; |
| 635 | } |
| 636 | |
| 637 | static void RDoSQ1(int32 end) |
| 638 | { |
| 639 | int32 V; |
| 640 | int32 start; |
| 641 | int32 freq; |
| 642 | |
| 643 | start=ChannelBC[0]; |
| 644 | if(end==0) end=(SOUNDTS<<16)/soundtsinc; |
| 645 | if(end<=start) return; |
| 646 | ChannelBC[0]=end; |
| 647 | |
| 648 | if(!(PSG[0x15]&1 && sqnon&1)) |
| 649 | return; |
| 650 | |
| 651 | if(curfreq[0]<8 || curfreq[0]>0x7ff) |
| 652 | return; |
| 653 | if(!CheckFreq(curfreq[0],PSG[0x1])) |
| 654 | return; |
| 655 | |
| 656 | CalcRectAmp(0); |
| 657 | |
| 658 | { |
| 659 | uint32 out=RectAmp[0][DutyCount[0]]; |
| 660 | freq=curfreq[0]+1; |
| 661 | { |
| 662 | freq<<=18; |
| 663 | for(V=start;V<end;V++) |
| 664 | { |
| 665 | Wave[V>>4]+=out; |
| 666 | sqacc[0]-=nesincsize; |
| 667 | if(sqacc[0]<=0) |
| 668 | { |
| 669 | rea: |
| 670 | sqacc[0]+=freq; |
| 671 | DutyCount[0]++; |
| 672 | if(sqacc[0]<=0) goto rea; |
| 673 | |
| 674 | DutyCount[0]&=7; |
| 675 | out=RectAmp[0][DutyCount[0]]; |
| 676 | } |
| 677 | } |
| 678 | } |
| 679 | } |
| 680 | } |
| 681 | |
| 682 | static void RDoSQ2(int32 end) |
| 683 | { |
| 684 | int32 V; |
| 685 | int32 start; |
| 686 | int32 freq; |
| 687 | |
| 688 | start=ChannelBC[1]; |
| 689 | if(end==0) end=(SOUNDTS<<16)/soundtsinc; |
| 690 | if(end<=start) return; |
| 691 | ChannelBC[1]=end; |
| 692 | |
| 693 | if(!(PSG[0x15]&2 && sqnon&2)) |
| 694 | return; |
| 695 | |
| 696 | if(curfreq[1]<8 || curfreq[1]>0x7ff) |
| 697 | return; |
| 698 | if(!CheckFreq(curfreq[1],PSG[0x5])) |
| 699 | return; |
| 700 | |
| 701 | CalcRectAmp(1); |
| 702 | |
| 703 | { |
| 704 | uint32 out=RectAmp[1][DutyCount[1]]; |
| 705 | freq=curfreq[1]+1; |
| 706 | |
| 707 | { |
| 708 | freq<<=18; |
| 709 | for(V=start;V<end;V++) |
| 710 | { |
| 711 | Wave[V>>4]+=out; |
| 712 | sqacc[1]-=nesincsize; |
| 713 | if(sqacc[1]<=0) |
| 714 | { |
| 715 | rea: |
| 716 | sqacc[1]+=freq; |
| 717 | DutyCount[1]++; |
| 718 | if(sqacc[1]<=0) goto rea; |
| 719 | |
| 720 | DutyCount[1]&=7; |
| 721 | out=RectAmp[1][DutyCount[1]]; |
| 722 | } |
| 723 | } |
| 724 | } |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | |
| 729 | static void RDoTriangle(int32 end) |
| 730 | { |
| 731 | static uint32 tcout=0; |
| 732 | int32 V; |
| 733 | int32 start; //,freq; |
| 734 | int32 freq=(((PSG[0xa]|((PSG[0xb]&7)<<8))+1)); |
| 735 | |
| 736 | start=ChannelBC[2]; |
| 737 | if(end==0) end=(SOUNDTS<<16)/soundtsinc; |
| 738 | if(end<=start) return; |
| 739 | ChannelBC[2]=end; |
| 740 | |
| 741 | if(! (PSG[0x15]&0x4 && sqnon&4 && tricoop) ) |
| 742 | { // Counter is halted, but we still need to output. |
| 743 | for(V=start;V<end;V++) |
| 744 | Wave[V>>4]+=tcout; |
| 745 | } |
| 746 | else if(freq<=4) // 55.9Khz - Might be barely audible on a real NES, but |
| 747 | // it's too costly to generate audio at this high of a frequency |
| 748 | // (55.9Khz * 32 for the stepping). |
| 749 | // The same could probably be said for ~27.8Khz, so we'll |
| 750 | // take care of that too. We'll just output the average |
| 751 | // value(15/2 - scaled properly for our output format, of course). |
| 752 | // We'll also take care of ~18Khz and ~14Khz too, since they should be barely audible. |
| 753 | // (Some proof or anything to confirm/disprove this would be nice.). |
| 754 | { |
| 755 | for(V=start;V<end;V++) |
| 756 | Wave[V>>4]+=((0xF<<4)+(0xF<<2))>>1; |
| 757 | } |
| 758 | else |
| 759 | { |
| 760 | static int32 triacc=0; |
| 761 | static uint8 tc=0; |
| 762 | |
| 763 | freq<<=17; |
| 764 | for(V=start;V<end;V++) |
| 765 | { |
| 766 | triacc-=nesincsize; |
| 767 | if(triacc<=0) |
| 768 | { |
| 769 | rea: |
| 770 | triacc+=freq; //t; |
| 771 | tc=(tc+1)&0x1F; |
| 772 | if(triacc<=0) goto rea; |
| 773 | |
| 774 | tcout=(tc&0xF); |
| 775 | if(tc&0x10) tcout^=0xF; |
| 776 | tcout=(tcout<<4)+(tcout<<2); |
| 777 | } |
| 778 | Wave[V>>4]+=tcout; |
| 779 | } |
| 780 | } |
| 781 | } |
| 782 | |
| 783 | static void RDoNoise(int32 end) |
| 784 | { |
| 785 | int32 inc,V; |
| 786 | int32 start; |
| 787 | |
| 788 | start=ChannelBC[3]; |
| 789 | if(end==0) end=(SOUNDTS<<16)/soundtsinc; |
| 790 | if(end<=start) return; |
| 791 | ChannelBC[3]=end; |
| 792 | |
| 793 | if(PSG[0x15]&0x8 && sqnon&8) |
| 794 | { |
| 795 | uint32 outo; |
| 796 | uint32 amptab[2]; |
| 797 | uint8 amplitude; |
| 798 | |
| 799 | amplitude=realvolume[2]; |
| 800 | //if(PSG[0xC]&0x10) |
| 801 | // amplitude=(PSG[0xC]&0xF); |
| 802 | //else |
| 803 | // amplitude=decvolume[2]&0xF; |
| 804 | |
| 805 | inc=NoiseFreqTable[PSG[0xE]&0xF]; |
| 806 | amptab[0]=((amplitude<<2)+amplitude+amplitude)<<1; |
| 807 | amptab[1]=0; |
| 808 | outo=amptab[nreg&1]; |
| 809 | |
| 810 | if(amplitude) |
| 811 | { |
| 812 | if(PSG[0xE]&0x80) // "short" noise |
| 813 | for(V=start;V<end;V++) |
| 814 | { |
| 815 | Wave[V>>4]+=outo; |
| 816 | if(count[3]>=inc) |
| 817 | { |
| 818 | uint8 feedback; |
| 819 | |
| 820 | feedback=((nreg>>8)&1)^((nreg>>14)&1); |
| 821 | nreg=(nreg<<1)+feedback; |
| 822 | nreg&=0x7fff; |
| 823 | outo=amptab[nreg&1]; |
| 824 | count[3]-=inc; |
| 825 | } |
| 826 | count[3]+=0x1000; |
| 827 | } |
| 828 | else |
| 829 | for(V=start;V<end;V++) |
| 830 | { |
| 831 | Wave[V>>4]+=outo; |
| 832 | if(count[3]>=inc) |
| 833 | { |
| 834 | uint8 feedback; |
| 835 | |
| 836 | feedback=((nreg>>13)&1)^((nreg>>14)&1); |
| 837 | nreg=(nreg<<1)+feedback; |
| 838 | nreg&=0x7fff; |
| 839 | outo=amptab[nreg&1]; |
| 840 | count[3]-=inc; |
| 841 | } |
| 842 | count[3]+=0x1000; |
| 843 | } |
| 844 | } |
| 845 | } |
| 846 | } |
| 847 | |
| 848 | DECLFW(Write_IRQFM) |
| 849 | { |
| 850 | PSG[0x17]=V; |
| 851 | V=(V&0xC0)>>6; |
| 852 | fcnt=0; |
| 853 | if(V&0x2) |
| 854 | FrameSoundUpdate(); |
| 855 | fcnt=1; |
| 856 | fhcnt=fhinc; |
| 857 | X6502_IRQEnd(FCEU_IQFCOUNT); |
| 858 | SIRQStat&=~0x40; |
| 859 | //IRQFrameMode=V; // IRQFrameMode is PSG[0x17] upper bits |
| 860 | } |
| 861 | |
| 862 | void SetNESSoundMap(void) |
| 863 | { |
| 864 | SetWriteHandler(0x4000,0x4013,Write_PSG); |
| 865 | SetWriteHandler(0x4011,0x4011,Write0x11); |
| 866 | SetWriteHandler(0x4015,0x4015,Write_PSG); |
| 867 | SetWriteHandler(0x4017,0x4017,Write_IRQFM); |
| 868 | SetReadHandler(0x4015,0x4015,Read_PSG); |
| 869 | } |
| 870 | |
| 871 | int32 highp; // 0 through 65536, 0 = no high pass, 65536 = max high pass |
| 872 | |
| 873 | int32 lowp; // 0 through 65536, 65536 = max low pass(total attenuation) |
| 874 | // 65536 = no low pass |
| 875 | static int32 flt_acc=0, flt_acc2=0; |
| 876 | |
| 877 | static void FilterSound(uint32 *in, int16 *outMono, int count) |
| 878 | { |
| 879 | // static int min=0, max=0; |
| 880 | |
| 881 | for(;count;count--,in++,outMono++) |
| 882 | { |
| 883 | int32 diff; |
| 884 | |
| 885 | diff = *in - flt_acc; |
| 886 | |
| 887 | flt_acc += (diff*highp)>>16; |
| 888 | flt_acc2+= (int32) (((int64)((diff-flt_acc2)*lowp))>>16); |
| 889 | *in=0; |
| 890 | |
| 891 | *outMono = flt_acc2*7 >> 2; // * 1.75 |
| 892 | // if (acc2 < min) { printf("min: %i %04x\n", acc2, acc2); min = acc2; } |
| 893 | // if (acc2 > max) { printf("max: %i %04x\n", acc2, acc2); max = acc2; } |
| 894 | } |
| 895 | } |
| 896 | |
| 897 | |
| 898 | |
| 899 | static int32 inbuf=0; |
| 900 | int FlushEmulateSound(void) |
| 901 | { |
| 902 | int x; |
| 903 | uint32 end; |
| 904 | |
| 905 | if(!timestamp) return(0); |
| 906 | |
| 907 | if(!FSettings.SndRate || (soundvol == 0)) |
| 908 | { |
| 909 | end=0; |
| 910 | goto nosoundo; |
| 911 | } |
| 912 | |
| 913 | end=(SOUNDTS<<16)/soundtsinc; |
| 914 | DoSQ1(end); |
| 915 | DoSQ2(end); |
| 916 | DoTriangle(end); |
| 917 | DoNoise(end); |
| 918 | DoPCM(end); |
| 919 | |
| 920 | if(GameExpSound.Fill) |
| 921 | GameExpSound.Fill(end&0xF); |
| 922 | |
| 923 | FilterSound(Wave,WaveFinalMono,end>>4); |
| 924 | |
| 925 | if(end&0xF) |
| 926 | Wave[0]=Wave[(end>>4)]; |
| 927 | Wave[(end>>4)]=0; |
| 928 | |
| 929 | nosoundo: |
| 930 | for(x=0;x<5;x++) |
| 931 | ChannelBC[x]=end&0xF; |
| 932 | soundtsoffs=(soundtsinc*(end&0xF))>>16; |
| 933 | end>>=4; |
| 934 | inbuf=end; |
| 935 | return(end); |
| 936 | } |
| 937 | |
| 938 | int GetSoundBuffer(int16 **W) |
| 939 | { |
| 940 | *W=WaveFinalMono; |
| 941 | return inbuf; |
| 942 | } |
| 943 | |
| 944 | void PowerSound(void) |
| 945 | { |
| 946 | int x; |
| 947 | |
| 948 | SetNESSoundMap(); |
| 949 | |
| 950 | for(x=0;x<0x16;x++) |
| 951 | if(x!=0x14) |
| 952 | BWrite[0x4000+x](0x4000+x,0); |
| 953 | PSG[0x17]=0; //x40; |
| 954 | fhcnt=fhinc; |
| 955 | fcnt=0; |
| 956 | nreg=1; |
| 957 | soundtsoffs=0; |
| 958 | } |
| 959 | |
| 960 | void ResetSound(void) |
| 961 | { |
| 962 | int x; |
| 963 | for(x=0;x<0x16;x++) |
| 964 | if(x!=1 && x!=5 && x!=0x14) BWrite[0x4000+x](0x4000+x,0); |
| 965 | PSG[0x17]=0; |
| 966 | fhcnt=fhinc; |
| 967 | fcnt=0; |
| 968 | nreg=1; |
| 969 | } |
| 970 | |
| 971 | void SetSoundVariables(void) |
| 972 | { |
| 973 | int x; |
| 974 | |
| 975 | fhinc=PAL?16626:14915; // *2 CPU clock rate |
| 976 | fhinc*=24; |
| 977 | for(x=0;x<0x20;x++) |
| 978 | lengthtable[x]=Slengthtable[x]<<1; |
| 979 | |
| 980 | if(FSettings.SndRate) |
| 981 | { |
| 982 | DoNoise=RDoNoise; |
| 983 | DoTriangle=RDoTriangle; |
| 984 | DoPCM=RDoPCM; |
| 985 | DoSQ1=RDoSQ1; |
| 986 | DoSQ2=RDoSQ2; |
| 987 | } |
| 988 | else |
| 989 | { |
| 990 | DoNoise=DoTriangle=DoPCM=DoSQ1=DoSQ2=Dummyfunc; |
| 991 | } |
| 992 | |
| 993 | if(!FSettings.SndRate) return; |
| 994 | if(GameExpSound.RChange) |
| 995 | GameExpSound.RChange(); |
| 996 | |
| 997 | // nesincsizeLL=(int64)((int64)562949953421312*(double)(PAL?PAL_CPU:NTSC_CPU)/(FSettings.SndRate OVERSAMPLE)); |
| 998 | nesincsize=(int32)(((int64)1<<17)*(double)(PAL?PAL_CPU:NTSC_CPU)/(FSettings.SndRate * 16)); // 308845 - 1832727 |
| 999 | PSG_base=(uint32)(PAL?(long double)PAL_CPU/16:(long double)NTSC_CPU/16); |
| 1000 | |
| 1001 | for(x=0;x<0x10;x++) |
| 1002 | { |
| 1003 | long double z; |
| 1004 | z=SNoiseFreqTable[x]<<1; |
| 1005 | z=(PAL?PAL_CPU:NTSC_CPU)/z; |
| 1006 | z=(long double)((uint32)((FSettings.SndRate OVERSAMPLE)<<12))/z; |
| 1007 | NoiseFreqTable[x]=z; |
| 1008 | } |
| 1009 | soundtsinc=(uint32)((uint64)(PAL?(long double)PAL_CPU*65536:(long double)NTSC_CPU*65536)/(FSettings.SndRate OVERSAMPLE)); |
| 1010 | memset(Wave,0,sizeof(Wave)); |
| 1011 | for(x=0;x<5;x++) |
| 1012 | ChannelBC[x]=0; |
| 1013 | highp=(250<<16)/FSettings.SndRate; // Arbitrary |
| 1014 | lowp=(25000<<16)/FSettings.SndRate; // Arbitrary |
| 1015 | |
| 1016 | if(highp>(1<<16)) highp=1<<16; |
| 1017 | if(lowp>(1<<16)) lowp=1<<16; |
| 1018 | |
| 1019 | flt_acc=flt_acc2=0; |
| 1020 | } |
| 1021 | |
| 1022 | void FixOldSaveStateSFreq(void) |
| 1023 | { |
| 1024 | int x; |
| 1025 | for(x=0;x<2;x++) |
| 1026 | { |
| 1027 | curfreq[x]=PSG[0x2+(x<<2)]|((PSG[0x3+(x<<2)]&7)<<8); |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | void FCEUI_Sound(int Rate) |
| 1032 | { |
| 1033 | FSettings.SndRate=Rate; |
| 1034 | SetSoundVariables(); |
| 1035 | } |
| 1036 | |
| 1037 | void FCEUI_SetSoundVolume(uint32 volume) |
| 1038 | { |
| 1039 | FSettings.SoundVolume=volume; |
| 1040 | } |