sound.c

   1 #include <string.h>
   2
   3
   4 #include "defs.h"
   5 #include "pcm.h"
   6 #include "sound.h"
   7 #include "cpu.h"
   8 #include "hw.h"
   9 #include "regs.h"
  10 #include "rc.h"
  11 #include "noise.h"
  12 #include "sys.h"
  13
  14 const static byte dmgwave[16] =
  15 {
  16         0xac, 0xdd, 0xda, 0x48,
  17         0x36, 0x02, 0xcf, 0x16,
  18         0x2c, 0x04, 0xe5, 0x2c,
  19         0xac, 0xdd, 0xda, 0x48
  20 };
  21
  22 const static byte cgbwave[16] =
  23 {
  24         0x00, 0xff, 0x00, 0xff,
  25         0x00, 0xff, 0x00, 0xff,
  26         0x00, 0xff, 0x00, 0xff,
  27         0x00, 0xff, 0x00, 0xff,
  28 };
  29
  30 const static byte sqwave[4][8] =
  31 {
  32         {  0, 0,-1, 0, 0, 0, 0, 0 },
  33         {  0,-1,-1, 0, 0, 0, 0, 0 },
  34         { -1,-1,-1,-1, 0, 0, 0, 0 },
  35         { -1, 0, 0,-1,-1,-1,-1,-1 }
  36 };
  37
  38 const static int freqtab[8] =
  39 {
  40         (1<<14)*2,
  41         (1<<14),
  42         (1<<14)/2,
  43         (1<<14)/3,
  44         (1<<14)/4,
  45         (1<<14)/5,
  46         (1<<14)/6,
  47         (1<<14)/7
  48 };
  49
  50 struct snd snd;
  51
  52 #define RATE (snd.rate)
  53 #define WAVE (snd.wave) /* ram.hi+0x30 */
  54 #define S1 (snd.ch[0])
  55 #define S2 (snd.ch[1])
  56 #define S3 (snd.ch[2])
  57 #define S4 (snd.ch[3])
  58
  59 rcvar_t sound_exports[] =
  60 {
  61         RCV_END
  62 };
  63
  64
  65 static void s1_freq_d(int d)
  66 {
  67         if (RATE > (d<<4)) S1.freq = 0;
  68         else S1.freq = (RATE << 17)/d;
  69 }
  70
  71 static void s1_freq()
  72 {
  73         s1_freq_d(2048 - (((R_NR14&7)<<8) + R_NR13));
  74 }
  75
  76 static void s2_freq()
  77 {
  78         int d = 2048 - (((R_NR24&7)<<8) + R_NR23);
  79         if (RATE > (d<<4)) S2.freq = 0;
  80         else S2.freq = (RATE << 17)/d;
  81 }
  82
  83 static void s3_freq()
  84 {
  85         int d = 2048 - (((R_NR34&7)<<8) + R_NR33);
  86         if (RATE > (d<<3)) S3.freq = 0;
  87         else S3.freq = (RATE << 21)/d;
  88 }
  89
  90 static void s4_freq()
  91 {
  92         S4.freq = (freqtab[R_NR43&7] >> (R_NR43 >> 4)) * RATE;
  93         if (S4.freq >> 18) S4.freq = 1<<18;
  94 }
  95
  96 void sound_dirty()
  97 {
  98         S1.swlen = ((R_NR10>>4) & 7) << 14;
  99         S1.len = (64-(R_NR11&63)) << 13;
 100         S1.envol = R_NR12 >> 4;
 101         S1.endir = (R_NR12>>3) & 1;
 102         S1.endir |= S1.endir - 1;
 103         S1.enlen = (R_NR12 & 7) << 15;
 104         s1_freq();
 105         S2.len = (64-(R_NR21&63)) << 13;
 106         S2.envol = R_NR22 >> 4;
 107         S2.endir = (R_NR22>>3) & 1;
 108         S2.endir |= S2.endir - 1;
 109         S2.enlen = (R_NR22 & 7) << 15;
 110         s2_freq();
 111         S3.len = (256-R_NR31) << 20;
 112         s3_freq();
 113         S4.len = (64-(R_NR41&63)) << 13;
 114         S4.envol = R_NR42 >> 4;
 115         S4.endir = (R_NR42>>3) & 1;
 116         S4.endir |= S4.endir - 1;
 117         S4.enlen = (R_NR42 & 7) << 15;
 118         s4_freq();
 119 }
 120
 121 void sound_off()
 122 {
 123         memset(&S1, 0, sizeof S1);
 124         memset(&S2, 0, sizeof S2);
 125         memset(&S3, 0, sizeof S3);
 126         memset(&S4, 0, sizeof S4);
 127         R_NR10 = 0x80;
 128         R_NR11 = 0xBF;
 129         R_NR12 = 0xF3;
 130         R_NR14 = 0xBF;
 131         R_NR21 = 0x3F;
 132         R_NR22 = 0x00;
 133         R_NR24 = 0xBF;
 134         R_NR30 = 0x7F;
 135         R_NR31 = 0xFF;
 136         R_NR32 = 0x9F;
 137         R_NR33 = 0xBF;
 138         R_NR41 = 0xFF;
 139         R_NR42 = 0x00;
 140         R_NR43 = 0x00;
 141         R_NR44 = 0xBF;
 142         R_NR50 = 0x77;
 143         R_NR51 = 0xF3;
 144         R_NR52 = 0xF1;
 145         sound_dirty();
 146 }
 147
 148 void sound_reset()
 149 {
 150         memset(&snd, 0, sizeof snd);
 151         if (pcm.hz) snd.rate = (1<<21) / pcm.hz;
 152         else snd.rate = 0;
 153         memcpy(WAVE, hw.cgb ? cgbwave : dmgwave, 16);
 154         memcpy(ram.hi+0x30, WAVE, 16);
 155         sound_off();
 156 }
 157
 158
 159 void sound_mix()
 160 {
 161         int s, l, r, f, n;
 162
 163         if (!RATE || cpu.snd < RATE) return;
 164
 165         for (; cpu.snd >= RATE; cpu.snd -= RATE)
 166         {
 167                 l = r = 0;
 168
 169                 if (S1.on)
 170                 {
 171                         s = sqwave[R_NR11>>6][(S1.pos>>18)&7] & S1.envol;
 172                         S1.pos += S1.freq;
 173                         if ((R_NR14 & 64) && ((S1.cnt += RATE) >= S1.len))
 174                                 S1.on = 0;
 175                         if (S1.enlen && (S1.encnt += RATE) >= S1.enlen)
 176                         {
 177                                 S1.encnt -= S1.enlen;
 178                                 S1.envol += S1.endir;
 179                                 if (S1.envol < 0) S1.envol = 0;
 180                                 if (S1.envol > 15) S1.envol = 15;
 181                         }
 182                         if (S1.swlen && (S1.swcnt += RATE) >= S1.swlen)
 183                         {
 184                                 S1.swcnt -= S1.swlen;
 185                                 f = S1.swfreq;
 186                                 n = (R_NR10 & 7);
 187                                 if (R_NR10 & 8) f -= (f >> n);
 188                                 else f += (f >> n);
 189                                 if (f > 2047)
 190                                         S1.on = 0;
 191                                 else
 192                                 {
 193                                         S1.swfreq = f;
 194                                         R_NR13 = f;
 195                                         R_NR14 = (R_NR14 & 0xF8) | (f>>8);
 196                                         s1_freq_d(2048 - f);
 197                                 }
 198                         }
 199                         s <<= 2;
 200                         if (R_NR51 & 1) r += s;
 201                         if (R_NR51 & 16) l += s;
 202                 }
 203
 204                 if (S2.on)
 205                 {
 206                         s = sqwave[R_NR21>>6][(S2.pos>>18)&7] & S2.envol;
 207                         S2.pos += S2.freq;
 208                         if ((R_NR24 & 64) && ((S2.cnt += RATE) >= S2.len))
 209                                 S2.on = 0;
 210                         if (S2.enlen && (S2.encnt += RATE) >= S2.enlen)
 211                         {
 212                                 S2.encnt -= S2.enlen;
 213                                 S2.envol += S2.endir;
 214                                 if (S2.envol < 0) S2.envol = 0;
 215                                 if (S2.envol > 15) S2.envol = 15;
 216                         }
 217                         s <<= 2;
 218                         if (R_NR51 & 2) r += s;
 219                         if (R_NR51 & 32) l += s;
 220                 }
 221
 222                 if (S3.on)
 223                 {
 224                         s = WAVE[(S3.pos>>22) & 15];
 225                         if (S3.pos & (1<<21)) s &= 15;
 226                         else s >>= 4;
 227                         s -= 8;
 228                         S3.pos += S3.freq;
 229                         if ((R_NR34 & 64) && ((S3.cnt += RATE) >= S3.len))
 230                                 S3.on = 0;
 231                         if (R_NR32 & 96) s <<= (3 - ((R_NR32>>5)&3));
 232                         else s = 0;
 233                         if (R_NR51 & 4) r += s;
 234                         if (R_NR51 & 64) l += s;
 235                 }
 236
 237                 if (S4.on)
 238                 {
 239                         if (R_NR43 & 8) s = 1 & (noise7[
 240                                 (S4.pos>>20)&15] >> (7-((S4.pos>>17)&7)));
 241                         else s = 1 & (noise15[
 242                                 (S4.pos>>20)&4095] >> (7-((S4.pos>>17)&7)));
 243                         s = (-s) & S4.envol;
 244                         S4.pos += S4.freq;
 245                         if ((R_NR44 & 64) && ((S4.cnt += RATE) >= S4.len))
 246                                 S4.on = 0;
 247                         if (S4.enlen && (S4.encnt += RATE) >= S4.enlen)
 248                         {
 249                                 S4.encnt -= S4.enlen;
 250                                 S4.envol += S4.endir;
 251                                 if (S4.envol < 0) S4.envol = 0;
 252                                 if (S4.envol > 15) S4.envol = 15;
 253                         }
 254                         s += s << 1;
 255                         if (R_NR51 & 8) r += s;
 256                         if (R_NR51 & 128) l += s;
 257                 }
 258
 259                 l *= (R_NR50 & 0x07);
 260                 r *= ((R_NR50 & 0x70)>>4);
 261                 l >>= 4;
 262                 r >>= 4;
 263
 264                 if (l > 127) l = 127;
 265                 else if (l < -128) l = -128;
 266                 if (r > 127) r = 127;
 267                 else if (r < -128) r = -128;
 268
 269                 if (pcm.buf)
 270                 {
 271                         if (pcm.pos >= pcm.len)
 272                                 pcm_submit();
 273                         if (pcm.stereo)
 274                         {
 275                                 pcm.buf[pcm.pos++] = l+128;
 276                                 pcm.buf[pcm.pos++] = r+128;
 277                         }
 278                         else pcm.buf[pcm.pos++] = ((l+r)>>1)+128;
 279                 }
 280         }
 281         R_NR52 = (R_NR52&0xf0) | S1.on | (S2.on<<1) | (S3.on<<2) | (S4.on<<3);
 282 }
 283
 284
 285
 286 byte sound_read(byte r)
 287 {
 288         sound_mix();
 289         /* printf("read %02X: %02X\n", r, REG(r)); */
 290         return REG(r);
 291 }
 292
 293 void s1_init()
 294 {
 295         S1.swcnt = 0;
 296         S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
 297         S1.envol = R_NR12 >> 4;
 298         S1.endir = (R_NR12>>3) & 1;
 299         S1.endir |= S1.endir - 1;
 300         S1.enlen = (R_NR12 & 7) << 15;
 301         if (!S1.on) S1.pos = 0;
 302         S1.on = 1;
 303         S1.cnt = 0;
 304         S1.encnt = 0;
 305 }
 306
 307 void s2_init()
 308 {
 309         S2.envol = R_NR22 >> 4;
 310         S2.endir = (R_NR22>>3) & 1;
 311         S2.endir |= S2.endir - 1;
 312         S2.enlen = (R_NR22 & 7) << 15;
 313         if (!S2.on) S2.pos = 0;
 314         S2.on = 1;
 315         S2.cnt = 0;
 316         S2.encnt = 0;
 317 }
 318
 319 void s3_init()
 320 {
 321         int i;
 322         if (!S3.on) S3.pos = 0;
 323         S3.cnt = 0;
 324         S3.on = R_NR30 >> 7;
 325         if (S3.on) for (i = 0; i < 16; i++)
 326                 ram.hi[i+0x30] = 0x13 ^ ram.hi[i+0x31];
 327 }
 328
 329 void s4_init()
 330 {
 331         S4.envol = R_NR42 >> 4;
 332         S4.endir = (R_NR42>>3) & 1;
 333         S4.endir |= S4.endir - 1;
 334         S4.enlen = (R_NR42 & 7) << 15;
 335         S4.on = 1;
 336         S4.pos = 0;
 337         S4.cnt = 0;
 338         S4.encnt = 0;
 339 }
 340
 341
 342 void sound_write(byte r, byte b)
 343 {
 344 #if 0
 345         static void *timer;
 346         if (!timer) timer = sys_timer();
 347         printf("write %02X: %02X @ %d\n", r, b, sys_elapsed(timer));
 348 #endif
 349
 350         if (!(R_NR52 & 128) && r != RI_NR52) return;
 351         if ((r & 0xF0) == 0x30)
 352         {
 353                 if (S3.on) sound_mix();
 354                 if (!S3.on)
 355                         WAVE[r-0x30] = ram.hi[r] = b;
 356                 return;
 357         }
 358         sound_mix();
 359         switch (r)
 360         {
 361         case RI_NR10:
 362                 R_NR10 = b;
 363                 S1.swlen = ((R_NR10>>4) & 7) << 14;
 364                 S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
 365                 break;
 366         case RI_NR11:
 367                 R_NR11 = b;
 368                 S1.len = (64-(R_NR11&63)) << 13;
 369                 break;
 370         case RI_NR12:
 371                 R_NR12 = b;
 372                 S1.envol = R_NR12 >> 4;
 373                 S1.endir = (R_NR12>>3) & 1;
 374                 S1.endir |= S1.endir - 1;
 375                 S1.enlen = (R_NR12 & 7) << 15;
 376                 break;
 377         case RI_NR13:
 378                 R_NR13 = b;
 379                 s1_freq();
 380                 break;
 381         case RI_NR14:
 382                 R_NR14 = b;
 383                 s1_freq();
 384                 if (b & 128) s1_init();
 385                 break;
 386         case RI_NR21:
 387                 R_NR21 = b;
 388                 S2.len = (64-(R_NR21&63)) << 13;
 389                 break;
 390         case RI_NR22:
 391                 R_NR22 = b;
 392                 S2.envol = R_NR22 >> 4;
 393                 S2.endir = (R_NR22>>3) & 1;
 394                 S2.endir |= S2.endir - 1;
 395                 S2.enlen = (R_NR22 & 7) << 15;
 396                 break;
 397         case RI_NR23:
 398                 R_NR23 = b;
 399                 s2_freq();
 400                 break;
 401         case RI_NR24:
 402                 R_NR24 = b;
 403                 s2_freq();
 404                 if (b & 128) s2_init();
 405                 break;
 406         case RI_NR30:
 407                 R_NR30 = b;
 408                 if (!(b & 128)) S3.on = 0;
 409                 break;
 410         case RI_NR31:
 411                 R_NR31 = b;
 412                 S3.len = (256-R_NR31) << 13;
 413                 break;
 414         case RI_NR32:
 415                 R_NR32 = b;
 416                 break;
 417         case RI_NR33:
 418                 R_NR33 = b;
 419                 s3_freq();
 420                 break;
 421         case RI_NR34:
 422                 R_NR34 = b;
 423                 s3_freq();
 424                 if (b & 128) s3_init();
 425                 break;
 426         case RI_NR41:
 427                 R_NR41 = b;
 428                 S4.len = (64-(R_NR41&63)) << 13;
 429                 break;
 430         case RI_NR42:
 431                 R_NR42 = b;
 432                 S4.envol = R_NR42 >> 4;
 433                 S4.endir = (R_NR42>>3) & 1;
 434                 S4.endir |= S4.endir - 1;
 435                 S4.enlen = (R_NR42 & 7) << 15;
 436                 break;
 437         case RI_NR43:
 438                 R_NR43 = b;
 439                 s4_freq();
 440                 break;
 441         case RI_NR44:
 442                 R_NR44 = b;
 443                 if (b & 128) s4_init();
 444                 break;
 445         case RI_NR50:
 446                 R_NR50 = b;
 447                 break;
 448         case RI_NR51:
 449                 R_NR51 = b;
 450                 break;
 451         case RI_NR52:
 452                 R_NR52 = b;
 453                 if (!(R_NR52 & 128))
 454                         sound_off();
 455                 break;
 456         default:
 457                 return;
 458         }
 459 }
 460
 461
 462
 463