| 1 | // This is part of Pico Library\r |
| 2 | \r |
| 3 | // (c) Copyright 2004 Dave, All rights reserved.\r |
| 4 | // (c) Copyright 2006 notaz, All rights reserved.\r |
| 5 | // Free for non-commercial use.\r |
| 6 | \r |
| 7 | // For commercial use, separate licencing terms must be obtained.\r |
| 8 | \r |
| 9 | \r |
| 10 | #include <string.h>\r |
| 11 | #include "ym2612.h"\r |
| 12 | #include "sn76496.h"\r |
| 13 | \r |
| 14 | #if defined(_USE_MZ80)\r |
| 15 | #include "../../cpu/mz80/mz80.h"\r |
| 16 | #elif defined(_USE_DRZ80)\r |
| 17 | #include "../../cpu/DrZ80/drz80.h"\r |
| 18 | #endif\r |
| 19 | \r |
| 20 | #include "../PicoInt.h"\r |
| 21 | #include "../cd/pcm.h"\r |
| 22 | #include "mix.h"\r |
| 23 | \r |
| 24 | // master int buffer to mix to\r |
| 25 | static int PsndBuffer[2*44100/50];\r |
| 26 | \r |
| 27 | // dac\r |
| 28 | static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r |
| 29 | \r |
| 30 | // for Pico\r |
| 31 | int PsndRate=0;\r |
| 32 | int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r |
| 33 | int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r |
| 34 | int PsndLen_exc_cnt=0;\r |
| 35 | short *PsndOut=NULL; // PCM data buffer\r |
| 36 | \r |
| 37 | // from ym2612.c\r |
| 38 | extern int *ym2612_dacen;\r |
| 39 | extern INT32 *ym2612_dacout;\r |
| 40 | void YM2612TimerHandler(int c,int cnt);\r |
| 41 | \r |
| 42 | // sn76496\r |
| 43 | extern int *sn76496_regs;\r |
| 44 | \r |
| 45 | \r |
| 46 | static void dac_recalculate(void)\r |
| 47 | {\r |
| 48 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r |
| 49 | \r |
| 50 | if(PsndLen <= lines) {\r |
| 51 | // shrinking algo\r |
| 52 | dac_cnt = -PsndLen;\r |
| 53 | len=1; pos=0;\r |
| 54 | dac_info[225] = 1;\r |
| 55 | \r |
| 56 | for(i=226; i != 225; i++) {\r |
| 57 | if (i >= lines) i = 0;\r |
| 58 | len = 0;\r |
| 59 | if(dac_cnt < 0) {\r |
| 60 | len=1;\r |
| 61 | pos++;\r |
| 62 | dac_cnt += lines;\r |
| 63 | }\r |
| 64 | dac_cnt -= PsndLen;\r |
| 65 | dac_info[i] = (pos<<4)|len;\r |
| 66 | }\r |
| 67 | } else {\r |
| 68 | // stretching\r |
| 69 | dac_cnt = PsndLen;\r |
| 70 | pos=0;\r |
| 71 | for(i = 225; i != 224; i++) {\r |
| 72 | if (i >= lines) i = 0;\r |
| 73 | len=0;\r |
| 74 | while(dac_cnt >= 0) {\r |
| 75 | dac_cnt -= lines;\r |
| 76 | len++;\r |
| 77 | }\r |
| 78 | if (i == mid) // midpoint\r |
| 79 | while(pos+len < PsndLen/2) {\r |
| 80 | dac_cnt -= lines;\r |
| 81 | len++;\r |
| 82 | }\r |
| 83 | dac_cnt += PsndLen;\r |
| 84 | dac_info[i] = (pos<<4)|len;\r |
| 85 | pos+=len;\r |
| 86 | }\r |
| 87 | // last sample\r |
| 88 | for(len = 0, i = pos; i < PsndLen; i++) len++;\r |
| 89 | if (PsndLen_exc_add) len++;\r |
| 90 | dac_info[224] = (pos<<4)|len;\r |
| 91 | }\r |
| 92 | //for(i=len=0; i < lines; i++) {\r |
| 93 | // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r |
| 94 | // len+=dac_info[i]&0xf;\r |
| 95 | //}\r |
| 96 | //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r |
| 97 | //printf("len total: %i, last pos: %i\n", len, pos);\r |
| 98 | //exit(8);\r |
| 99 | }\r |
| 100 | \r |
| 101 | \r |
| 102 | PICO_INTERNAL void sound_reset(void)\r |
| 103 | {\r |
| 104 | void *ym2612_regs;\r |
| 105 | \r |
| 106 | // also clear the internal registers+addr line\r |
| 107 | ym2612_regs = YM2612GetRegs();\r |
| 108 | memset(ym2612_regs, 0, 0x200+4);\r |
| 109 | // setting these to 0 might confuse timing code,\r |
| 110 | // so better set to something like this instead\r |
| 111 | z80startCycle = z80stopCycle = 0x01000000;\r |
| 112 | \r |
| 113 | sound_rerate(0);\r |
| 114 | }\r |
| 115 | \r |
| 116 | \r |
| 117 | // to be called after changing sound rate or chips\r |
| 118 | void sound_rerate(int preserve_state)\r |
| 119 | {\r |
| 120 | unsigned int state[28];\r |
| 121 | int target_fps = Pico.m.pal ? 50 : 60;\r |
| 122 | \r |
| 123 | // not all rates are supported in MCD mode due to mp3 decoder limitations\r |
| 124 | if (PicoMCD & 1) {\r |
| 125 | if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;\r |
| 126 | PicoOpt |= 8; // force stereo\r |
| 127 | }\r |
| 128 | \r |
| 129 | if (preserve_state) {\r |
| 130 | if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r |
| 131 | Pico_mcd->m.audio_offset = mp3_get_offset();\r |
| 132 | }\r |
| 133 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
| 134 | if (preserve_state) {\r |
| 135 | // feed it back it's own registers, just like after loading state\r |
| 136 | YM2612PicoStateLoad();\r |
| 137 | if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r |
| 138 | mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r |
| 139 | }\r |
| 140 | \r |
| 141 | if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r |
| 142 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
| 143 | if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r |
| 144 | \r |
| 145 | // calculate PsndLen\r |
| 146 | PsndLen=PsndRate / target_fps;\r |
| 147 | PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r |
| 148 | PsndLen_exc_cnt=0;\r |
| 149 | \r |
| 150 | // recalculate dac info\r |
| 151 | dac_recalculate();\r |
| 152 | \r |
| 153 | if (PicoMCD & 1)\r |
| 154 | pcm_set_rate(PsndRate);\r |
| 155 | \r |
| 156 | // clear all buffers\r |
| 157 | memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r |
| 158 | if (PsndOut)\r |
| 159 | sound_clear();\r |
| 160 | }\r |
| 161 | \r |
| 162 | \r |
| 163 | // This is called once per raster (aka line), but not necessarily for every line\r |
| 164 | PICO_INTERNAL void sound_timers_and_dac(int raster)\r |
| 165 | {\r |
| 166 | int pos, len;\r |
| 167 | int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;\r |
| 168 | // int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);\r |
| 169 | \r |
| 170 | // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r |
| 171 | YM2612PicoTick(1);\r |
| 172 | \r |
| 173 | if (!do_dac /*&& !do_pcm*/) return;\r |
| 174 | \r |
| 175 | pos=dac_info[raster], len=pos&0xf;\r |
| 176 | if (!len) return;\r |
| 177 | \r |
| 178 | pos>>=4;\r |
| 179 | \r |
| 180 | if (do_dac) {\r |
| 181 | short *d = PsndOut + pos*2;\r |
| 182 | int dout = *ym2612_dacout;\r |
| 183 | if(PicoOpt&8) {\r |
| 184 | // some manual loop unrolling here :)\r |
| 185 | d[0] = dout;\r |
| 186 | if (len > 1) {\r |
| 187 | d[2] = dout;\r |
| 188 | if (len > 2)\r |
| 189 | d[4] = dout;\r |
| 190 | }\r |
| 191 | } else {\r |
| 192 | short *d = PsndOut + pos;\r |
| 193 | d[0] = dout;\r |
| 194 | if (len > 1) {\r |
| 195 | d[1] = dout;\r |
| 196 | if (len > 2)\r |
| 197 | d[2] = dout;\r |
| 198 | }\r |
| 199 | }\r |
| 200 | }\r |
| 201 | \r |
| 202 | #if 0\r |
| 203 | if (do_pcm) {\r |
| 204 | int *d = PsndBuffer;\r |
| 205 | d += (PicoOpt&8) ? pos*2 : pos;\r |
| 206 | pcm_update(d, len, 1);\r |
| 207 | }\r |
| 208 | #endif\r |
| 209 | }\r |
| 210 | \r |
| 211 | \r |
| 212 | PICO_INTERNAL void sound_clear(void)\r |
| 213 | {\r |
| 214 | int len = PsndLen;\r |
| 215 | if (PsndLen_exc_add) len++;\r |
| 216 | if (PicoOpt & 8) memset32((int *) PsndOut, 0, len); // clear both channels at once\r |
| 217 | else memset(PsndOut, 0, len<<1);\r |
| 218 | }\r |
| 219 | \r |
| 220 | \r |
| 221 | PICO_INTERNAL int sound_render(int offset, int length)\r |
| 222 | {\r |
| 223 | int buf32_updated = 0;\r |
| 224 | int *buf32 = PsndBuffer+offset;\r |
| 225 | int stereo = (PicoOpt & 8) >> 3;\r |
| 226 | // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r |
| 227 | int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r |
| 228 | offset <<= stereo;\r |
| 229 | \r |
| 230 | if (offset == 0) { // should happen once per frame\r |
| 231 | // compensate for float part of PsndLen\r |
| 232 | PsndLen_exc_cnt += PsndLen_exc_add;\r |
| 233 | if (PsndLen_exc_cnt >= 0x10000) {\r |
| 234 | PsndLen_exc_cnt -= 0x10000;\r |
| 235 | length++;\r |
| 236 | }\r |
| 237 | }\r |
| 238 | \r |
| 239 | // PSG\r |
| 240 | if (PicoOpt & 2)\r |
| 241 | SN76496Update(PsndOut+offset, length, stereo);\r |
| 242 | \r |
| 243 | // Add in the stereo FM buffer\r |
| 244 | if (PicoOpt & 1) {\r |
| 245 | buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r |
| 246 | } else\r |
| 247 | memset32(buf32, 0, length<<stereo);\r |
| 248 | \r |
| 249 | //printf("active_chs: %02x\n", buf32_updated);\r |
| 250 | \r |
| 251 | // CD: PCM sound\r |
| 252 | if (do_pcm) {\r |
| 253 | pcm_update(buf32, length, stereo);\r |
| 254 | //buf32_updated = 1;\r |
| 255 | }\r |
| 256 | \r |
| 257 | // CD: CDDA audio\r |
| 258 | if ((PicoMCD & 1) && (PicoOpt & 0x800))\r |
| 259 | mp3_update(buf32, length, stereo);\r |
| 260 | \r |
| 261 | // convert + limit to normal 16bit output\r |
| 262 | if (stereo)\r |
| 263 | mix_32_to_16l_stereo(PsndOut+offset, buf32, length);\r |
| 264 | else mix_32_to_16_mono (PsndOut+offset, buf32, length);\r |
| 265 | \r |
| 266 | return length;\r |
| 267 | }\r |
| 268 | \r |
| 269 | \r |
| 270 | \r |
| 271 | #if defined(_USE_MZ80)\r |
| 272 | \r |
| 273 | // memhandlers for mz80 core\r |
| 274 | unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r |
| 275 | void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r |
| 276 | \r |
| 277 | // structures for mz80 core\r |
| 278 | static struct MemoryReadByte mz80_mem_read[]=\r |
| 279 | {\r |
| 280 | {0x0000,0xffff,mz80_read},\r |
| 281 | {(UINT32) -1,(UINT32) -1,NULL}\r |
| 282 | };\r |
| 283 | static struct MemoryWriteByte mz80_mem_write[]=\r |
| 284 | {\r |
| 285 | {0x0000,0xffff,mz80_write},\r |
| 286 | {(UINT32) -1,(UINT32) -1,NULL}\r |
| 287 | };\r |
| 288 | static struct z80PortRead mz80_io_read[] ={\r |
| 289 | {(UINT16) -1,(UINT16) -1,NULL}\r |
| 290 | };\r |
| 291 | static struct z80PortWrite mz80_io_write[]={\r |
| 292 | {(UINT16) -1,(UINT16) -1,NULL}\r |
| 293 | };\r |
| 294 | \r |
| 295 | #elif defined(_USE_DRZ80)\r |
| 296 | \r |
| 297 | static struct DrZ80 drZ80;\r |
| 298 | \r |
| 299 | static unsigned int DrZ80_rebasePC(unsigned short a)\r |
| 300 | {\r |
| 301 | drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r |
| 302 | return drZ80.Z80PC_BASE + a;\r |
| 303 | }\r |
| 304 | \r |
| 305 | static unsigned int DrZ80_rebaseSP(unsigned short a)\r |
| 306 | {\r |
| 307 | drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r |
| 308 | return drZ80.Z80SP_BASE + a;\r |
| 309 | }\r |
| 310 | \r |
| 311 | static unsigned char DrZ80_in(unsigned short p)\r |
| 312 | {\r |
| 313 | elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r |
| 314 | return 0xff;\r |
| 315 | }\r |
| 316 | \r |
| 317 | static void DrZ80_out(unsigned short p,unsigned char d)\r |
| 318 | {\r |
| 319 | elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r |
| 320 | }\r |
| 321 | \r |
| 322 | static void DrZ80_irq_callback()\r |
| 323 | {\r |
| 324 | drZ80.Z80_IRQ = 0; // lower irq when accepted\r |
| 325 | }\r |
| 326 | \r |
| 327 | #endif\r |
| 328 | \r |
| 329 | // z80 functionality wrappers\r |
| 330 | PICO_INTERNAL void z80_init(void)\r |
| 331 | {\r |
| 332 | #if defined(_USE_MZ80)\r |
| 333 | struct mz80context z80;\r |
| 334 | \r |
| 335 | // z80\r |
| 336 | mz80init();\r |
| 337 | // Modify the default context\r |
| 338 | mz80GetContext(&z80);\r |
| 339 | \r |
| 340 | // point mz80 stuff\r |
| 341 | z80.z80Base=Pico.zram;\r |
| 342 | z80.z80MemRead=mz80_mem_read;\r |
| 343 | z80.z80MemWrite=mz80_mem_write;\r |
| 344 | z80.z80IoRead=mz80_io_read;\r |
| 345 | z80.z80IoWrite=mz80_io_write;\r |
| 346 | \r |
| 347 | mz80SetContext(&z80);\r |
| 348 | \r |
| 349 | #elif defined(_USE_DRZ80)\r |
| 350 | \r |
| 351 | memset(&drZ80, 0, sizeof(struct DrZ80));\r |
| 352 | drZ80.z80_rebasePC=DrZ80_rebasePC;\r |
| 353 | drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r |
| 354 | drZ80.z80_read8 =z80_read;\r |
| 355 | drZ80.z80_read16 =z80_read16;\r |
| 356 | drZ80.z80_write8 =z80_write;\r |
| 357 | drZ80.z80_write16 =z80_write16;\r |
| 358 | drZ80.z80_in =DrZ80_in;\r |
| 359 | drZ80.z80_out =DrZ80_out;\r |
| 360 | drZ80.z80_irq_callback=DrZ80_irq_callback;\r |
| 361 | #endif\r |
| 362 | }\r |
| 363 | \r |
| 364 | PICO_INTERNAL void z80_reset(void)\r |
| 365 | {\r |
| 366 | #if defined(_USE_MZ80)\r |
| 367 | mz80reset();\r |
| 368 | #elif defined(_USE_DRZ80)\r |
| 369 | memset(&drZ80, 0, 0x54);\r |
| 370 | drZ80.Z80F = (1<<2); // set ZFlag\r |
| 371 | drZ80.Z80F2 = (1<<2); // set ZFlag\r |
| 372 | drZ80.Z80IX = 0xFFFF << 16;\r |
| 373 | drZ80.Z80IY = 0xFFFF << 16;\r |
| 374 | drZ80.Z80IM = 0; // 1?\r |
| 375 | drZ80.Z80PC = drZ80.z80_rebasePC(0);\r |
| 376 | drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r |
| 377 | #endif\r |
| 378 | Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r |
| 379 | }\r |
| 380 | \r |
| 381 | PICO_INTERNAL void z80_resetCycles(void)\r |
| 382 | {\r |
| 383 | #if defined(_USE_MZ80)\r |
| 384 | mz80GetElapsedTicks(1);\r |
| 385 | #endif\r |
| 386 | }\r |
| 387 | \r |
| 388 | PICO_INTERNAL void z80_int(void)\r |
| 389 | {\r |
| 390 | #if defined(_USE_MZ80)\r |
| 391 | mz80int(0);\r |
| 392 | #elif defined(_USE_DRZ80)\r |
| 393 | drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r |
| 394 | drZ80.Z80_IRQ = 1;\r |
| 395 | #endif\r |
| 396 | }\r |
| 397 | \r |
| 398 | // returns number of cycles actually executed\r |
| 399 | PICO_INTERNAL int z80_run(int cycles)\r |
| 400 | {\r |
| 401 | #if defined(_USE_MZ80)\r |
| 402 | int ticks_pre = mz80GetElapsedTicks(0);\r |
| 403 | mz80exec(cycles);\r |
| 404 | return mz80GetElapsedTicks(0) - ticks_pre;\r |
| 405 | #elif defined(_USE_DRZ80)\r |
| 406 | return cycles - DrZ80Run(&drZ80, cycles);\r |
| 407 | #else\r |
| 408 | return cycles;\r |
| 409 | #endif\r |
| 410 | }\r |
| 411 | \r |
| 412 | PICO_INTERNAL void z80_pack(unsigned char *data)\r |
| 413 | {\r |
| 414 | #if defined(_USE_MZ80)\r |
| 415 | struct mz80context mz80;\r |
| 416 | *(int *)data = 0x00005A6D; // "mZ"\r |
| 417 | mz80GetContext(&mz80);\r |
| 418 | memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r |
| 419 | #elif defined(_USE_DRZ80)\r |
| 420 | *(int *)data = 0x015A7244; // "DrZ" v1\r |
| 421 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
| 422 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 423 | memcpy(data+4, &drZ80, 0x54);\r |
| 424 | #endif\r |
| 425 | }\r |
| 426 | \r |
| 427 | PICO_INTERNAL void z80_unpack(unsigned char *data)\r |
| 428 | {\r |
| 429 | #if defined(_USE_MZ80)\r |
| 430 | if(*(int *)data == 0x00005A6D) { // "mZ" save?\r |
| 431 | struct mz80context mz80;\r |
| 432 | mz80GetContext(&mz80);\r |
| 433 | memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r |
| 434 | mz80SetContext(&mz80);\r |
| 435 | } else {\r |
| 436 | z80_reset();\r |
| 437 | z80_int();\r |
| 438 | }\r |
| 439 | #elif defined(_USE_DRZ80)\r |
| 440 | if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r |
| 441 | memcpy(&drZ80, data+4, 0x54);\r |
| 442 | // update bases\r |
| 443 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
| 444 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 445 | } else {\r |
| 446 | z80_reset();\r |
| 447 | drZ80.Z80IM = 1;\r |
| 448 | z80_int(); // try to goto int handler, maybe we won't execute trash there?\r |
| 449 | }\r |
| 450 | #endif\r |
| 451 | }\r |
| 452 | \r |
| 453 | PICO_INTERNAL void z80_exit(void)\r |
| 454 | {\r |
| 455 | #if defined(_USE_MZ80)\r |
| 456 | mz80shutdown();\r |
| 457 | #endif\r |
| 458 | }\r |
| 459 | \r |
| 460 | #if defined(__DEBUG_PRINT) || defined(__GP2X__)\r |
| 461 | PICO_INTERNAL void z80_debug(char *dstr)\r |
| 462 | {\r |
| 463 | #if defined(_USE_DRZ80)\r |
| 464 | sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 465 | #endif\r |
| 466 | }\r |
| 467 | #endif\r |