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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 soundtsinc; |
43 | uint32 soundtsi; |
44 | |
45 | uint32 Wave[2048]; |
46 | int32 WaveFinal[2048]; |
47 | |
48 | EXPSOUND GameExpSound={0,0,0}; |
49 | |
50 | uint8 trimode=0; |
51 | uint8 tricoop=0; |
52 | uint8 PSG[0x18]; |
53 | |
54 | uint8 decvolume[3]; |
55 | uint8 realvolume[3]; |
56 | |
57 | static int32 count[5]; |
58 | static int64 sqacc[2]={0,0}; |
59 | uint8 sqnon=0; |
60 | |
61 | #undef printf |
62 | uint16 nreg; |
63 | |
64 | int32 lengthcount[4]; |
65 | |
66 | static const uint8 Slengthtable[0x20]= |
67 | { |
68 | 0x5,0x7f,0xA,0x1,0x14,0x2,0x28,0x3,0x50,0x4,0x1E,0x5,0x7,0x6,0x0E,0x7, |
69 | 0x6,0x08,0xC,0x9,0x18,0xa,0x30,0xb,0x60,0xc,0x24,0xd,0x8,0xe,0x10,0xf |
70 | }; |
71 | |
72 | static uint32 lengthtable[0x20]; |
73 | |
74 | static const uint32 SNoiseFreqTable[0x10]= |
75 | { |
76 | 2,4,8,0x10,0x20,0x30,0x40,0x50,0x65,0x7f,0xbe,0xfe,0x17d,0x1fc,0x3f9,0x7f2 |
77 | }; |
78 | static uint32 NoiseFreqTable[0x10]; |
79 | |
80 | int64 nesincsizeLL; |
81 | |
82 | static const uint8 NTSCPCMTable[0x10]= |
83 | { |
84 | 0xd6,0xbe,0xaa,0xa0,0x8f,0x7f,0x71,0x6b, |
85 | 0x5f,0x50,0x47,0x40,0x35,0x2a,0x24,0x1b |
86 | }; |
87 | |
88 | static const uint8 PALPCMTable[0x10]= // These values are just guessed. |
89 | { |
90 | 0xc6,0xb0,0x9d,0x94,0x84,0x75,0x68,0x63, |
91 | 0x58,0x4a,0x41,0x3b,0x31,0x27,0x21,0x19 |
92 | }; |
93 | |
94 | uint32 PSG_base; |
95 | |
96 | // $4010 - Frequency |
97 | // $4011 - Actual data outputted |
98 | // $4012 - Address register: $c000 + V*64 |
99 | // $4013 - Size register: Size in bytes = (V+1)*64 |
100 | |
101 | |
102 | static int64 PCMacc=0; |
103 | static int PCMfreq; |
104 | int32 PCMIRQCount; |
105 | uint8 PCMBitIndex=0; |
106 | uint32 PCMAddressIndex=0; |
107 | int32 PCMSizeIndex=0; |
108 | uint8 PCMBuffer=0; |
109 | int vdis=0; |
110 | |
111 | static void Dummyfunc(void) {}; |
112 | |
113 | static void (*DoNoise)(void)=Dummyfunc; |
114 | static void (*DoTriangle)(void)=Dummyfunc; |
115 | static void (*DoPCM)(void)=Dummyfunc; |
116 | static void (*DoSQ1)(void)=Dummyfunc; |
117 | static void (*DoSQ2)(void)=Dummyfunc; |
118 | |
119 | static void CalcDPCMIRQ(void) |
120 | { |
121 | uint32 freq; |
122 | uint32 honk; |
123 | uint32 cycles; |
124 | |
125 | if(PAL) |
126 | freq=(PALPCMTable[PSG[0x10]&0xF]<<4); |
127 | else |
128 | freq=(NTSCPCMTable[PSG[0x10]&0xF]<<4); |
129 | |
130 | cycles=(((PSG[0x13]<<4)+1)); |
131 | cycles*=freq/14; |
132 | honk=((PSG[0x13]<<4)+1)*freq; |
133 | honk-=cycles; |
134 | //if(PAL) honk/=107; |
135 | //else honk/=(double)113.66666666; |
136 | PCMIRQCount=honk*48; |
137 | //PCMIRQCount=honk*3; //180; |
138 | //if(PAL) PCMIRQCount*=.93; |
139 | vdis=0; |
140 | } |
141 | |
142 | static void PrepDPCM() |
143 | { |
144 | PCMAddressIndex=0x4000+(PSG[0x12]<<6); |
145 | PCMSizeIndex=(PSG[0x13]<<4)+1; |
146 | PCMBitIndex=0; |
147 | //PCMBuffer=ARead[0x8000+PCMAddressIndex](0x8000+PCMAddressIndex); |
148 | if(PAL) |
149 | PCMfreq=PALPCMTable[PSG[0x10]&0xF]; |
150 | else |
151 | PCMfreq=NTSCPCMTable[PSG[0x10]&0xF]; |
152 | PCMacc=(int64)PCMfreq<<50; |
153 | } |
154 | |
155 | uint8 sweepon[2]={0,0}; |
156 | int32 curfreq[2]={0,0}; |
157 | |
158 | |
159 | uint8 SIRQStat=0; |
160 | |
161 | uint8 SweepCount[2]; |
162 | uint8 DecCountTo1[3]; |
163 | |
164 | uint8 fcnt=0; |
165 | int32 fhcnt=0; |
166 | int32 fhinc; |
167 | |
168 | static uint8 laster; |
169 | |
170 | /* Instantaneous? Maybe the new freq value is being calculated all of the time... */ |
171 | static int FASTAPASS(2) CheckFreq(uint32 cf, uint8 sr) |
172 | { |
173 | uint32 mod; |
174 | if(!(sr&0x8)) |
175 | { |
176 | mod=cf>>(sr&7); |
177 | if((mod+cf)&0x800) |
178 | return(0); |
179 | } |
180 | return(1); |
181 | } |
182 | |
183 | static DECLFW(Write0x11) |
184 | { |
185 | DoPCM(); |
186 | PSG[0x11]=V&0x7F; |
187 | } |
188 | |
189 | static uint8 DutyCount[2]={0,0}; |
190 | |
191 | static DECLFW(Write_PSG) |
192 | { |
193 | //if((A>=0x4004 && A<=0x4007) || A==0x4015) |
194 | //printf("$%04x:$%02x, %d\n",A,V,timestamp); |
195 | A&=0x1f; |
196 | switch(A) |
197 | { |
198 | case 0x0: |
199 | DoSQ1(); |
200 | if(V&0x10) |
201 | realvolume[0]=V&0xF; |
202 | break; |
203 | case 0x1: |
204 | sweepon[0]=V&0x80; |
205 | break; |
206 | case 0x2: |
207 | DoSQ1(); |
208 | curfreq[0]&=0xFF00; |
209 | curfreq[0]|=V; |
210 | break; |
211 | case 0x3: |
212 | if(PSG[0x15]&1) |
213 | { |
214 | DoSQ1(); |
215 | lengthcount[0]=lengthtable[(V>>3)&0x1f]; |
216 | sqnon|=1; |
217 | } |
218 | sweepon[0]=PSG[1]&0x80; |
219 | curfreq[0]=PSG[0x2]|((V&7)<<8); |
220 | decvolume[0]=0xF; |
221 | DecCountTo1[0]=(PSG[0]&0xF)+1; |
222 | SweepCount[0]=((PSG[0x1]>>4)&7)+1; |
223 | DutyCount[0]=0; |
224 | sqacc[0]=((int64)curfreq[0]+1)<<50; |
225 | break; |
226 | |
227 | case 0x4: |
228 | DoSQ2(); |
229 | if(V&0x10) |
230 | realvolume[1]=V&0xF; |
231 | break; |
232 | case 0x5: |
233 | sweepon[1]=V&0x80; |
234 | break; |
235 | case 0x6: |
236 | DoSQ2(); |
237 | curfreq[1]&=0xFF00; |
238 | curfreq[1]|=V; |
239 | break; |
240 | case 0x7: |
241 | if(PSG[0x15]&2) |
242 | { |
243 | DoSQ2(); |
244 | lengthcount[1]=lengthtable[(V>>3)&0x1f]; |
245 | sqnon|=2; |
246 | } |
247 | sweepon[1]=PSG[0x5]&0x80; |
248 | curfreq[1]=PSG[0x6]|((V&7)<<8); |
249 | decvolume[1]=0xF; |
250 | DecCountTo1[1]=(PSG[0x4]&0xF)+1; |
251 | SweepCount[1]=((PSG[0x5]>>4)&7)+1; |
252 | DutyCount[1]=0; |
253 | sqacc[1]=((int64)curfreq[1]+1)<<50; |
254 | break; |
255 | case 0x8: |
256 | DoTriangle(); |
257 | if(laster&0x80) |
258 | { |
259 | tricoop=V&0x7F; |
260 | trimode=V&0x80; |
261 | } |
262 | if(!(V&0x7F)) |
263 | tricoop=0; |
264 | laster=V&0x80; |
265 | break; |
266 | case 0xa:DoTriangle(); |
267 | break; |
268 | case 0xb: |
269 | if(PSG[0x15]&0x4) |
270 | { |
271 | DoTriangle(); |
272 | sqnon|=4; |
273 | lengthcount[2]=lengthtable[(V>>3)&0x1f]; |
274 | } |
275 | laster=0x80; |
276 | tricoop=PSG[0x8]&0x7f; |
277 | trimode=PSG[0x8]&0x80; |
278 | break; |
279 | case 0xC:DoNoise(); |
280 | if(V&0x10) |
281 | realvolume[2]=V&0xF; |
282 | break; |
283 | case 0xE:DoNoise();break; |
284 | case 0xF: |
285 | if(PSG[0x15]&8) |
286 | { |
287 | DoNoise(); |
288 | sqnon|=8; |
289 | lengthcount[3]=lengthtable[(V>>3)&0x1f]; |
290 | } |
291 | decvolume[2]=0xF; |
292 | DecCountTo1[2]=(PSG[0xC]&0xF)+1; |
293 | break; |
294 | case 0x10:DoPCM(); |
295 | if(!(V&0x80)) |
296 | X6502_IRQEnd(FCEU_IQDPCM); |
297 | break; |
298 | case 0x15: |
299 | { |
300 | int t=V^PSG[0x15]; |
301 | |
302 | if(t&1) |
303 | DoSQ1(); |
304 | if(t&2) |
305 | DoSQ2(); |
306 | if(t&4) |
307 | DoTriangle(); |
308 | if(t&8) |
309 | DoNoise(); |
310 | if(t&0x10) |
311 | DoPCM(); |
312 | sqnon&=V; |
313 | if(V&0x10) |
314 | { |
315 | if(!(PSG[0x15]&0x10)) |
316 | { |
317 | PrepDPCM(); |
318 | CalcDPCMIRQ(); |
319 | } |
320 | else if(vdis) |
321 | CalcDPCMIRQ(); |
322 | } |
323 | else |
324 | PCMIRQCount=0; |
325 | X6502_IRQEnd(FCEU_IQDPCM); |
326 | } |
327 | break; |
328 | case 0x17: |
329 | V&=0xC0; |
330 | fcnt=0; |
331 | if(V&0x80) |
332 | FrameSoundUpdate(); |
333 | fhcnt=fhinc; |
334 | X6502_IRQEnd(FCEU_IQFCOUNT); |
335 | SIRQStat&=~0x40; |
336 | break; |
337 | } |
338 | PSG[A]=V; |
339 | } |
340 | |
341 | DECLFR(Read_PSG) |
342 | { |
343 | uint8 ret; |
344 | if(PSG[0x15]&0x10) |
345 | DoPCM(); |
346 | ret=(PSG[0x15]&(sqnon|0x10))|SIRQStat; |
347 | SIRQStat&=~0x40; |
348 | X6502_IRQEnd(/*FCEU_IQDPCM|*/FCEU_IQFCOUNT); |
349 | return ret; |
350 | } |
351 | |
352 | DECLFR(Read_PSGDummy) |
353 | { |
354 | uint8 ret; |
355 | |
356 | ret=(PSG[0x15]&sqnon)|SIRQStat; |
357 | SIRQStat&=~0x40; |
358 | X6502_IRQEnd(/*FCEU_IQDPCM|*/FCEU_IQFCOUNT); |
359 | return ret; |
360 | } |
361 | |
362 | static void FASTAPASS(1) FrameSoundStuff(int V) |
363 | { |
364 | int P; |
365 | |
366 | DoSQ1(); |
367 | DoSQ2(); |
368 | DoNoise(); |
369 | |
370 | switch((V&1)) |
371 | { |
372 | case 1: /* Envelope decay, linear counter, length counter, freq sweep */ |
373 | if(PSG[0x15]&4 && sqnon&4) |
374 | if(!(PSG[8]&0x80)) |
375 | { |
376 | if(lengthcount[2]>0) |
377 | { |
378 | lengthcount[2]--; |
379 | if(lengthcount[2]<=0) |
380 | { |
381 | DoTriangle(); |
382 | sqnon&=~4; |
383 | } |
384 | } |
385 | } |
386 | |
387 | for(P=0;P<2;P++) |
388 | { |
389 | if(PSG[0x15]&(P+1) && sqnon&(P+1)) |
390 | { |
391 | if(!(PSG[P<<2]&0x20)) |
392 | { |
393 | if(lengthcount[P]>0) |
394 | { |
395 | lengthcount[P]--; |
396 | if(lengthcount[P]<=0) |
397 | { |
398 | sqnon&=~(P+1); |
399 | } |
400 | } |
401 | } |
402 | } |
403 | /* Frequency Sweep Code Here */ |
404 | /* xxxx 0000 */ |
405 | /* xxxx = hz. 120/(x+1)*/ |
406 | if(sweepon[P]) |
407 | { |
408 | int32 mod=0; |
409 | |
410 | if(SweepCount[P]>0) SweepCount[P]--; |
411 | if(SweepCount[P]<=0) |
412 | { |
413 | SweepCount[P]=((PSG[(P<<2)+0x1]>>4)&7)+1; //+1; |
414 | { |
415 | if(PSG[(P<<2)+0x1]&0x8) |
416 | { |
417 | mod-=(P^1)+((curfreq[P])>>(PSG[(P<<2)+0x1]&7)); |
418 | |
419 | if(curfreq[P] && (PSG[(P<<2)+0x1]&7)/* && sweepon[P]&0x80*/) |
420 | { |
421 | curfreq[P]+=mod; |
422 | } |
423 | } |
424 | else |
425 | { |
426 | mod=curfreq[P]>>(PSG[(P<<2)+0x1]&7); |
427 | if((mod+curfreq[P])&0x800) |
428 | { |
429 | sweepon[P]=0; |
430 | curfreq[P]=0; |
431 | } |
432 | else |
433 | { |
434 | if(curfreq[P] && (PSG[(P<<2)+0x1]&7)/* && sweepon[P]&0x80*/) |
435 | { |
436 | curfreq[P]+=mod; |
437 | } |
438 | } |
439 | } |
440 | } |
441 | } |
442 | } |
443 | } |
444 | |
445 | if(PSG[0x15]&0x8 && sqnon&8) |
446 | { |
447 | if(!(PSG[0xC]&0x20)) |
448 | { |
449 | if(lengthcount[3]>0) |
450 | { |
451 | lengthcount[3]--; |
452 | if(lengthcount[3]<=0) |
453 | { |
454 | sqnon&=~8; |
455 | } |
456 | } |
457 | } |
458 | } |
459 | |
460 | case 0: /* Envelope decay + linear counter */ |
461 | if(!trimode) |
462 | { |
463 | laster=0; |
464 | if(tricoop) |
465 | { |
466 | if(tricoop==1) DoTriangle(); |
467 | tricoop--; |
468 | } |
469 | } |
470 | |
471 | for(P=0;P<2;P++) |
472 | { |
473 | if(DecCountTo1[P]>0) DecCountTo1[P]--; |
474 | if(DecCountTo1[P]<=0) |
475 | { |
476 | DecCountTo1[P]=(PSG[P<<2]&0xF)+1; |
477 | if(decvolume[P] || PSG[P<<2]&0x20) |
478 | { |
479 | decvolume[P]--; |
480 | /* Step from 0 to full volume seems to take twice as long |
481 | as the other steps. I don't know if this is the correct |
482 | way to double its length, though(or if it even matters). |
483 | */ |
484 | if((PSG[P<<2]&0x20) && (decvolume[P]==0)) |
485 | DecCountTo1[P]<<=1; |
486 | decvolume[P]&=15; |
487 | } |
488 | } |
489 | if(!(PSG[P<<2]&0x10)) |
490 | realvolume[P]=decvolume[P]; |
491 | } |
492 | |
493 | if(DecCountTo1[2]>0) DecCountTo1[2]--; |
494 | if(DecCountTo1[2]<=0) |
495 | { |
496 | DecCountTo1[2]=(PSG[0xC]&0xF)+1; |
497 | if(decvolume[2] || PSG[0xC]&0x20) |
498 | { |
499 | decvolume[2]--; |
500 | /* Step from 0 to full volume seems to take twice as long |
501 | as the other steps. I don't know if this is the correct |
502 | way to double its length, though(or if it even matters). |
503 | */ |
504 | if((PSG[0xC]&0x20) && (decvolume[2]==0)) |
505 | DecCountTo1[2]<<=1; |
506 | decvolume[2]&=15; |
507 | } |
508 | } |
509 | if(!(PSG[0xC]&0x10)) |
510 | realvolume[2]=decvolume[2]; |
511 | |
512 | break; |
513 | } |
514 | |
515 | } |
516 | |
517 | void FrameSoundUpdate(void) |
518 | { |
519 | // Linear counter: Bit 0-6 of $4008 |
520 | // Length counter: Bit 4-7 of $4003, $4007, $400b, $400f |
521 | |
522 | if(fcnt==3) |
523 | { |
524 | if(PSG[0x17]&0x80) |
525 | fhcnt+=fhinc; |
526 | if(!(PSG[0x17]&0xC0)) |
527 | { |
528 | SIRQStat|=0x40; |
529 | X6502_IRQBegin(FCEU_IQFCOUNT); |
530 | } |
531 | } |
532 | //if(SIRQStat&0x40) X6502_IRQBegin(FCEU_IQFCOUNT); |
533 | FrameSoundStuff(fcnt); |
534 | fcnt=(fcnt+1)&3; |
535 | } |
536 | |
537 | static uint32 ChannelBC[5]; |
538 | |
539 | static uint32 RectAmp[2][8]; |
540 | |
541 | static void FASTAPASS(1) CalcRectAmp(int P) |
542 | { |
543 | static int tal[4]={1,2,4,6}; |
544 | int V; |
545 | int x; |
546 | uint32 *b=RectAmp[P]; |
547 | int m; |
548 | |
549 | //if(PSG[P<<2]&0x10) |
550 | V=realvolume[P]<<4; |
551 | //V=(PSG[P<<2]&15)<<4; |
552 | //else |
553 | // V=decvolume[P]<<4; |
554 | m=tal[(PSG[P<<2]&0xC0)>>6]; |
555 | for(x=0;x<m;x++,b++) |
556 | *b=0; |
557 | for(;x<8;x++,b++) |
558 | *b=V; |
559 | } |
560 | |
561 | static void RDoPCM(void) |
562 | { |
563 | int32 V; |
564 | int32 start,end; |
565 | int64 freq; |
566 | uint32 out=PSG[0x11]<<3; |
567 | |
568 | start=ChannelBC[4]; |
569 | end=(timestamp<<16)/soundtsinc; |
570 | if(end<=start) return; |
571 | ChannelBC[4]=end; |
572 | |
573 | if(PSG[0x15]&0x10) |
574 | { |
575 | freq=PCMfreq; |
576 | freq<<=50; |
577 | |
578 | for(V=start;V<end;V++) |
579 | { |
580 | PCMacc-=nesincsizeLL; |
581 | if(PCMacc<=0) |
582 | { |
583 | if(!PCMBitIndex) |
584 | { |
585 | PCMSizeIndex--; |
586 | if(!PCMSizeIndex) |
587 | { |
588 | if(PSG[0x10]&0x40) |
589 | PrepDPCM(); |
590 | else |
591 | { |
592 | PSG[0x15]&=~0x10; |
593 | for(;V<end;V++) |
594 | Wave[V>>4]+=PSG[0x11]<<3; |
595 | goto endopcmo; |
596 | } |
597 | } |
598 | else |
599 | { |
600 | PCMBuffer=ARead[0x8000+PCMAddressIndex](0x8000+PCMAddressIndex); |
601 | PCMAddressIndex=(PCMAddressIndex+1)&0x7fff; |
602 | } |
603 | } |
604 | |
605 | { |
606 | int t=(((PCMBuffer>>PCMBitIndex)&1)<<2)-2; |
607 | uint8 bah=PSG[0x11]; |
608 | |
609 | PCMacc+=freq; |
610 | PSG[0x11]+=t; |
611 | if(PSG[0x11]&0x80) |
612 | PSG[0x11]=bah; |
613 | else |
614 | out=PSG[0x11]<<3; |
615 | } |
616 | PCMBitIndex=(PCMBitIndex+1)&7; |
617 | } |
618 | Wave[V>>4]+=out; //(PSG[0x11]-64)<<3; |
619 | } |
620 | } |
621 | else |
622 | { |
623 | if((end-start)>64) |
624 | { |
625 | for(V=start;V<=(start|15);V++) |
626 | Wave[V>>4]+=out; |
627 | out<<=4; |
628 | for(V=(start>>4)+1;V<(end>>4);V++) |
629 | Wave[V]+=out; |
630 | out>>=4; |
631 | for(V=end&(~15);V<end;V++) |
632 | Wave[V>>4]+=out; |
633 | } |
634 | else |
635 | for(V=start;V<end;V++) |
636 | Wave[V>>4]+=out; |
637 | } |
638 | endopcmo:; |
639 | } |
640 | |
641 | static void RDoSQ1(void) |
642 | { |
643 | int32 V; |
644 | int32 start,end; |
645 | int64 freq; |
646 | |
647 | CalcRectAmp(0); |
648 | start=ChannelBC[0]; |
649 | end=(timestamp<<16)/soundtsinc; |
650 | if(end<=start) return; |
651 | ChannelBC[0]=end; |
652 | |
653 | if(curfreq[0]<8 || curfreq[0]>0x7ff) |
654 | return; |
655 | if(!CheckFreq(curfreq[0],PSG[0x1])) |
656 | return; |
657 | |
658 | if(PSG[0x15]&1 && sqnon&1) |
659 | { |
660 | uint32 out=RectAmp[0][DutyCount[0]]; |
661 | freq=curfreq[0]+1; |
662 | { |
663 | freq<<=50; |
664 | for(V=start;V<end;V++) |
665 | { |
666 | Wave[V>>4]+=out; |
667 | sqacc[0]-=nesincsizeLL; |
668 | if(sqacc[0]<=0) |
669 | { |
670 | rea: |
671 | sqacc[0]+=freq; |
672 | DutyCount[0]++; |
673 | if(sqacc[0]<=0) goto rea; |
674 | |
675 | DutyCount[0]&=7; |
676 | out=RectAmp[0][DutyCount[0]]; |
677 | } |
678 | |
679 | } |
680 | } |
681 | } |
682 | } |
683 | |
684 | static void RDoSQ2(void) |
685 | { |
686 | int32 V; |
687 | int32 start,end; |
688 | int64 freq; |
689 | |
690 | CalcRectAmp(1); |
691 | start=ChannelBC[1]; |
692 | end=(timestamp<<16)/soundtsinc; |
693 | if(end<=start) return; |
694 | ChannelBC[1]=end; |
695 | |
696 | if(curfreq[1]<8 || curfreq[1]>0x7ff) |
697 | return; |
698 | if(!CheckFreq(curfreq[1],PSG[0x5])) |
699 | return; |
700 | |
701 | if(PSG[0x15]&2 && sqnon&2) |
702 | { |
703 | uint32 out=RectAmp[1][DutyCount[1]]; |
704 | freq=curfreq[1]+1; |
705 | |
706 | { |
707 | freq<<=50; |
708 | for(V=start;V<end;V++) |
709 | { |
710 | Wave[V>>4]+=out; |
711 | sqacc[1]-=nesincsizeLL; |
712 | if(sqacc[1]<=0) |
713 | { |
714 | rea: |
715 | sqacc[1]+=freq; |
716 | DutyCount[1]++; |
717 | if(sqacc[1]<=0) goto rea; |
718 | |
719 | DutyCount[1]&=7; |
720 | out=RectAmp[1][DutyCount[1]]; |
721 | } |
722 | |
723 | } |
724 | } |
725 | } |
726 | } |
727 | |
728 | |
729 | static void RDoTriangle(void) |
730 | { |
731 | static uint32 tcout=0; |
732 | int32 V; |
733 | int32 start,end; //,freq; |
734 | int64 freq=(((PSG[0xa]|((PSG[0xb]&7)<<8))+1)); |
735 | |
736 | start=ChannelBC[2]; |
737 | end=(timestamp<<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 int64 triacc=0; |
761 | static uint8 tc=0; |
762 | |
763 | freq<<=49; |
764 | for(V=start;V<end;V++) |
765 | { |
766 | triacc-=nesincsizeLL; |
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(void) |
784 | { |
785 | int32 inc,V; |
786 | int32 start,end; |
787 | |
788 | start=ChannelBC[3]; |
789 | end=(timestamp<<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 | |
849 | void SetNESSoundMap(void) |
850 | { |
851 | SetWriteHandler(0x4000,0x4013,Write_PSG); |
852 | SetWriteHandler(0x4011,0x4011,Write0x11); |
853 | SetWriteHandler(0x4015,0x4015,Write_PSG); |
854 | SetWriteHandler(0x4017,0x4017,Write_PSG); |
855 | SetReadHandler(0x4015,0x4015,Read_PSG); |
856 | } |
857 | |
858 | static int32 WaveNSF[256]; |
859 | |
860 | int64 highp; // 0 through 65536, 0 = no high pass, 65536 = max high pass |
861 | |
862 | int64 lowp; // 0 through 65536, 65536 = max low pass(total attenuation) |
863 | // 65536 = no low pass |
864 | static void FilterSound(uint32 *in, int32 *out, int count) |
865 | { |
866 | static int64 acc=0, acc2=0; |
867 | |
868 | for(;count;count--,in++,out++) |
869 | { |
870 | int64 diff; |
871 | |
872 | diff=((int64)*in<<24)-acc; |
873 | |
874 | acc+=(diff*highp)>>16; |
875 | acc2+=((diff-acc2)*lowp)>>16; |
876 | *in=0; |
877 | *out=(acc2*(int64)FSettings.SoundVolume)>>(24+16); |
878 | if(*out<-32767) *out=-32767; |
879 | if(*out>32767) *out=32767; |
880 | //*out=((int64)(acc2>>24)*(int64)FSettings.SoundVolume)>>16; //acc2>>24; |
881 | } |
882 | } |
883 | |
884 | int FlushEmulateSound(void) |
885 | { |
886 | uint32 end; |
887 | int x; |
888 | |
889 | if(!timestamp) return(0); |
890 | |
891 | if(!FSettings.SndRate) |
892 | { |
893 | end=0; |
894 | goto nosoundo; |
895 | } |
896 | |
897 | end=(timestamp<<16)/soundtsinc; |
898 | DoSQ1(); |
899 | DoSQ2(); |
900 | DoTriangle(); |
901 | DoNoise(); |
902 | DoPCM(); |
903 | |
904 | if(GameExpSound.Fill) |
905 | GameExpSound.Fill(end&0xF); |
906 | |
907 | FilterSound(Wave,WaveFinal,end>>4); |
908 | |
909 | if(FCEUGameInfo.type==GIT_NSF) |
910 | { |
911 | int x,s=0,si=end/1024; // Only want 1/4 of the output buffer to be displayed |
912 | for(x=0;x<256;x++) |
913 | { |
914 | WaveNSF[x]=WaveFinal[s>>4]; |
915 | s+=si; |
916 | } |
917 | } |
918 | |
919 | if(end&0xF) |
920 | Wave[0]=Wave[(end>>4)]; |
921 | Wave[(end>>4)]=0; |
922 | |
923 | nosoundo: |
924 | for(x=0;x<5;x++) |
925 | ChannelBC[x]=end&0xF; |
926 | timestampbase+=timestamp; |
927 | timestamp=(soundtsinc*(end&0xF))>>16; |
928 | timestampbase-=timestamp; |
929 | return(end>>4); |
930 | } |
931 | |
932 | void GetSoundBuffer(int32 **W) |
933 | { |
934 | *W=WaveNSF; |
935 | } |
936 | |
937 | void PowerSound(void) |
938 | { |
939 | int x; |
940 | |
941 | SetNESSoundMap(); |
942 | |
943 | for(x=0;x<0x16;x++) |
944 | if(x!=0x14) |
945 | BWrite[0x4000+x](0x4000+x,0); |
946 | PSG[0x17]=0; //x40; |
947 | fhcnt=fhinc; |
948 | fcnt=0; |
949 | nreg=1; |
950 | } |
951 | |
952 | void ResetSound(void) |
953 | { |
954 | int x; |
955 | for(x=0;x<0x16;x++) |
956 | if(x!=1 && x!=5 && x!=0x14) BWrite[0x4000+x](0x4000+x,0); |
957 | PSG[0x17]=0; |
958 | fhcnt=fhinc; |
959 | fcnt=0; |
960 | nreg=1; |
961 | } |
962 | |
963 | void SetSoundVariables(void) |
964 | { |
965 | int x; |
966 | |
967 | fhinc=PAL?16626:14915; // *2 CPU clock rate |
968 | fhinc*=24; |
969 | for(x=0;x<0x20;x++) |
970 | lengthtable[x]=Slengthtable[x]<<1; |
971 | |
972 | if(FSettings.SndRate) |
973 | { |
974 | DoNoise=RDoNoise; |
975 | DoTriangle=RDoTriangle; |
976 | DoPCM=RDoPCM; |
977 | DoSQ1=RDoSQ1; |
978 | DoSQ2=RDoSQ2; |
979 | } |
980 | else |
981 | { |
982 | DoNoise=DoTriangle=DoPCM=DoSQ1=DoSQ2=Dummyfunc; |
983 | } |
984 | |
985 | if(!FSettings.SndRate) return; |
986 | if(GameExpSound.RChange) |
987 | GameExpSound.RChange(); |
988 | |
989 | nesincsizeLL=(int64)((int64)562949953421312*(long double)(PAL?PAL_CPU:NTSC_CPU)/(FSettings.SndRate OVERSAMPLE)); |
990 | PSG_base=(uint32)(PAL?(long double)PAL_CPU/16:(long double)NTSC_CPU/16); |
991 | |
992 | for(x=0;x<0x10;x++) |
993 | { |
994 | long double z; |
995 | z=SNoiseFreqTable[x]<<1; |
996 | z=(PAL?PAL_CPU:NTSC_CPU)/z; |
997 | z=(long double)((uint32)((FSettings.SndRate OVERSAMPLE)<<12))/z; |
998 | NoiseFreqTable[x]=z; |
999 | } |
1000 | soundtsinc=(uint32)((uint64)(PAL?(long double)PAL_CPU*65536:(long double)NTSC_CPU*65536)/(FSettings.SndRate OVERSAMPLE)); |
1001 | memset(Wave,0,2048*4); |
1002 | for(x=0;x<5;x++) |
1003 | ChannelBC[x]=0; |
1004 | highp=(250<<16)/FSettings.SndRate; // Arbitrary |
1005 | lowp=((int64)25000<<16)/FSettings.SndRate; // Arbitrary |
1006 | |
1007 | if(highp>(1<<16)) highp=1<<16; |
1008 | if(lowp>(1<<16)) lowp=1<<16; |
1009 | } |
1010 | |
1011 | void FixOldSaveStateSFreq(void) |
1012 | { |
1013 | int x; |
1014 | for(x=0;x<2;x++) |
1015 | { |
1016 | curfreq[x]=PSG[0x2+(x<<2)]|((PSG[0x3+(x<<2)]&7)<<8); |
1017 | } |
1018 | } |
1019 | |
1020 | void FCEUI_Sound(int Rate) |
1021 | { |
1022 | FSettings.SndRate=Rate; |
1023 | SetSoundVariables(); |
1024 | } |
1025 | |
1026 | void FCEUI_SetSoundVolume(uint32 volume) |
1027 | { |
1028 | FSettings.SoundVolume=(volume<<16)/100; |
1029 | } |