c62d2810 |
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 | } |