| 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 "sound.h"\r |
| 12 | #include "ym2612.h"\r |
| 13 | #include "sn76496.h"\r |
| 14 | \r |
| 15 | #ifndef __GNUC__\r |
| 16 | #pragma warning (disable:4244)\r |
| 17 | #endif\r |
| 18 | \r |
| 19 | #if defined(_USE_MZ80)\r |
| 20 | #include "../../cpu/mz80/mz80.h"\r |
| 21 | #elif defined(_USE_DRZ80)\r |
| 22 | #include "../../cpu/DrZ80/drz80.h"\r |
| 23 | #endif\r |
| 24 | \r |
| 25 | #include "../PicoInt.h"\r |
| 26 | \r |
| 27 | \r |
| 28 | //int z80CycleAim = 0;\r |
| 29 | \r |
| 30 | // dac\r |
| 31 | short *dac_out;\r |
| 32 | unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r |
| 33 | \r |
| 34 | // for Pico\r |
| 35 | int PsndRate=0;\r |
| 36 | int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r |
| 37 | short *PsndOut=NULL; // PCM data buffer\r |
| 38 | \r |
| 39 | // from ym2612.c\r |
| 40 | extern int *ym2612_dacen;\r |
| 41 | extern INT32 *ym2612_dacout;\r |
| 42 | void YM2612TimerHandler(int c,int cnt);\r |
| 43 | \r |
| 44 | // sn76496\r |
| 45 | extern int *sn76496_regs;\r |
| 46 | \r |
| 47 | \r |
| 48 | static void dac_recalculate()\r |
| 49 | {\r |
| 50 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r |
| 51 | \r |
| 52 | if(PsndLen <= lines) {\r |
| 53 | // shrinking algo\r |
| 54 | dac_cnt = 0;//lines - PsndLen;\r |
| 55 | len=1; pos=0;\r |
| 56 | dac_info[225] = 1;\r |
| 57 | \r |
| 58 | for(i=226; i != 225; i++) {\r |
| 59 | if (i >= lines) i = 0;\r |
| 60 | len = 0;\r |
| 61 | if(dac_cnt < 0) {\r |
| 62 | len=1;\r |
| 63 | pos++;\r |
| 64 | dac_cnt += lines;\r |
| 65 | }\r |
| 66 | dac_cnt -= PsndLen;\r |
| 67 | dac_info[i] = (pos<<4)|len;\r |
| 68 | }\r |
| 69 | } else {\r |
| 70 | // stretching\r |
| 71 | dac_cnt = PsndLen/2;\r |
| 72 | pos=0;\r |
| 73 | for(i = 225; i != 224; i++) {\r |
| 74 | if (i >= lines) i = 0;\r |
| 75 | len=0;\r |
| 76 | while(dac_cnt >= 0) {\r |
| 77 | dac_cnt -= lines;\r |
| 78 | len++;\r |
| 79 | }\r |
| 80 | if (i == mid) // midpoint\r |
| 81 | while(pos+len < PsndLen/2) {\r |
| 82 | dac_cnt -= lines;\r |
| 83 | len++;\r |
| 84 | }\r |
| 85 | dac_cnt += PsndLen;\r |
| 86 | dac_info[i] = (pos<<4)|len;\r |
| 87 | pos+=len;\r |
| 88 | }\r |
| 89 | // last sample\r |
| 90 | for(len = 0, i = pos; i < PsndLen; i++) len++;\r |
| 91 | dac_info[224] = (pos<<4)|len;\r |
| 92 | }\r |
| 93 | // dprintf("rate is %i, len %i", PsndRate, PsndLen);\r |
| 94 | // for(i=0; i < lines; i++)\r |
| 95 | // dprintf("%03i : %03i : %i", i, dac_info[i]>>4, dac_info[i]&0xf);\r |
| 96 | //exit(8);\r |
| 97 | }\r |
| 98 | \r |
| 99 | \r |
| 100 | void sound_reset()\r |
| 101 | {\r |
| 102 | extern int z80stopCycle;\r |
| 103 | void *ym2612_regs;\r |
| 104 | \r |
| 105 | // init even if we are not going to use them, just in case we ever enable it\r |
| 106 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
| 107 | // also clear the internal registers+addr line\r |
| 108 | ym2612_regs = YM2612GetRegs();\r |
| 109 | memset(ym2612_regs, 0, 0x200+4);\r |
| 110 | \r |
| 111 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
| 112 | \r |
| 113 | // calculate PsndLen\r |
| 114 | PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r |
| 115 | \r |
| 116 | // recalculate dac info\r |
| 117 | dac_recalculate();\r |
| 118 | z80stopCycle = 0;\r |
| 119 | }\r |
| 120 | \r |
| 121 | \r |
| 122 | // to be called after changing sound rate or chips\r |
| 123 | void sound_rerate()\r |
| 124 | {\r |
| 125 | unsigned int state[28];\r |
| 126 | \r |
| 127 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
| 128 | // feed it back it's own registers, just like after loading state\r |
| 129 | YM2612PicoStateLoad();\r |
| 130 | \r |
| 131 | memcpy(state, sn76496_regs, 28*4); // remember old state\r |
| 132 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
| 133 | memcpy(sn76496_regs, state, 28*4); // restore old state\r |
| 134 | \r |
| 135 | // calculate PsndLen\r |
| 136 | PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r |
| 137 | \r |
| 138 | // recalculate dac info\r |
| 139 | dac_recalculate();\r |
| 140 | }\r |
| 141 | \r |
| 142 | \r |
| 143 | // This is called once per raster (aka line), but not necessarily for every line\r |
| 144 | int sound_timers_and_dac(int raster)\r |
| 145 | {\r |
| 146 | if(raster >= 0 && PsndOut && (PicoOpt&1) && *ym2612_dacen) {\r |
| 147 | short dout = (short) *ym2612_dacout;\r |
| 148 | int pos=dac_info[raster], len=pos&0xf;\r |
| 149 | short *d;\r |
| 150 | pos>>=4;\r |
| 151 | \r |
| 152 | if(PicoOpt&8) { // only left channel for stereo (will be copied to right by ym2612 mixing code)\r |
| 153 | d=PsndOut+pos*2;\r |
| 154 | while(len--) { *d = dout; d += 2; }\r |
| 155 | } else {\r |
| 156 | d=PsndOut+pos;\r |
| 157 | while(len--) *d++ = dout;\r |
| 158 | }\r |
| 159 | }\r |
| 160 | \r |
| 161 | //dprintf("s: %03i", raster);\r |
| 162 | \r |
| 163 | // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r |
| 164 | YM2612PicoTick(1);\r |
| 165 | \r |
| 166 | return 0;\r |
| 167 | }\r |
| 168 | \r |
| 169 | \r |
| 170 | int sound_render(int offset, int length)\r |
| 171 | {\r |
| 172 | int stereo = (PicoOpt & 8) >> 3;\r |
| 173 | offset <<= stereo;\r |
| 174 | \r |
| 175 | // PSG\r |
| 176 | if(PicoOpt & 2)\r |
| 177 | SN76496Update(PsndOut+offset, length, stereo);\r |
| 178 | \r |
| 179 | // Add in the stereo FM buffer\r |
| 180 | if(PicoOpt & 1) {\r |
| 181 | YM2612UpdateOne(PsndOut+offset, length, stereo);\r |
| 182 | } else {\r |
| 183 | // YM2612 upmixes to stereo, so we have to do this manually here\r |
| 184 | int i;\r |
| 185 | short *s = PsndOut+offset;\r |
| 186 | for (i = 0; i < length; i++) {\r |
| 187 | *(s+1) = *s; s+=2;\r |
| 188 | }\r |
| 189 | }\r |
| 190 | \r |
| 191 | return 0;\r |
| 192 | }\r |
| 193 | \r |
| 194 | \r |
| 195 | \r |
| 196 | #if defined(_USE_MZ80)\r |
| 197 | \r |
| 198 | // memhandlers for mz80 core\r |
| 199 | unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r |
| 200 | void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r |
| 201 | \r |
| 202 | // structures for mz80 core\r |
| 203 | static struct MemoryReadByte mz80_mem_read[]=\r |
| 204 | {\r |
| 205 | {0x0000,0xffff,mz80_read},\r |
| 206 | {(UINT32) -1,(UINT32) -1,NULL}\r |
| 207 | };\r |
| 208 | static struct MemoryWriteByte mz80_mem_write[]=\r |
| 209 | {\r |
| 210 | {0x0000,0xffff,mz80_write},\r |
| 211 | {(UINT32) -1,(UINT32) -1,NULL}\r |
| 212 | };\r |
| 213 | static struct z80PortRead mz80_io_read[] ={\r |
| 214 | {(UINT16) -1,(UINT16) -1,NULL}\r |
| 215 | };\r |
| 216 | static struct z80PortWrite mz80_io_write[]={\r |
| 217 | {(UINT16) -1,(UINT16) -1,NULL}\r |
| 218 | };\r |
| 219 | \r |
| 220 | #elif defined(_USE_DRZ80)\r |
| 221 | \r |
| 222 | static struct DrZ80 drZ80;\r |
| 223 | \r |
| 224 | static unsigned int DrZ80_rebasePC(unsigned short a)\r |
| 225 | {\r |
| 226 | drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r |
| 227 | return drZ80.Z80PC_BASE + a;\r |
| 228 | }\r |
| 229 | \r |
| 230 | static unsigned int DrZ80_rebaseSP(unsigned short a)\r |
| 231 | {\r |
| 232 | drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r |
| 233 | return drZ80.Z80SP_BASE + a;\r |
| 234 | }\r |
| 235 | \r |
| 236 | static unsigned char DrZ80_in(unsigned short p)\r |
| 237 | {\r |
| 238 | return 0xff;\r |
| 239 | }\r |
| 240 | \r |
| 241 | static void DrZ80_out(unsigned short p,unsigned char d)\r |
| 242 | {\r |
| 243 | }\r |
| 244 | \r |
| 245 | static void DrZ80_irq_callback()\r |
| 246 | {\r |
| 247 | drZ80.Z80_IRQ = 0; // lower irq when accepted\r |
| 248 | }\r |
| 249 | \r |
| 250 | #endif\r |
| 251 | \r |
| 252 | // z80 functionality wrappers\r |
| 253 | void z80_init()\r |
| 254 | {\r |
| 255 | #if defined(_USE_MZ80)\r |
| 256 | struct mz80context z80;\r |
| 257 | \r |
| 258 | // z80\r |
| 259 | mz80init();\r |
| 260 | // Modify the default context\r |
| 261 | mz80GetContext(&z80);\r |
| 262 | \r |
| 263 | // point mz80 stuff\r |
| 264 | z80.z80Base=Pico.zram;\r |
| 265 | z80.z80MemRead=mz80_mem_read;\r |
| 266 | z80.z80MemWrite=mz80_mem_write;\r |
| 267 | z80.z80IoRead=mz80_io_read;\r |
| 268 | z80.z80IoWrite=mz80_io_write;\r |
| 269 | \r |
| 270 | mz80SetContext(&z80);\r |
| 271 | \r |
| 272 | #elif defined(_USE_DRZ80)\r |
| 273 | \r |
| 274 | memset(&drZ80, 0, sizeof(struct DrZ80));\r |
| 275 | drZ80.z80_rebasePC=DrZ80_rebasePC;\r |
| 276 | drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r |
| 277 | drZ80.z80_read8 =z80_read;\r |
| 278 | drZ80.z80_read16 =z80_read16;\r |
| 279 | drZ80.z80_write8 =z80_write;\r |
| 280 | drZ80.z80_write16 =z80_write16;\r |
| 281 | drZ80.z80_in =DrZ80_in;\r |
| 282 | drZ80.z80_out =DrZ80_out;\r |
| 283 | drZ80.z80_irq_callback=DrZ80_irq_callback;\r |
| 284 | #endif\r |
| 285 | }\r |
| 286 | \r |
| 287 | void z80_reset()\r |
| 288 | {\r |
| 289 | #if defined(_USE_MZ80)\r |
| 290 | mz80reset();\r |
| 291 | #elif defined(_USE_DRZ80)\r |
| 292 | memset(&drZ80, 0, 0x54);\r |
| 293 | drZ80.Z80F = (1<<2); // set ZFlag\r |
| 294 | drZ80.Z80F2 = (1<<2); // set ZFlag\r |
| 295 | drZ80.Z80IX = 0xFFFF << 16;\r |
| 296 | drZ80.Z80IY = 0xFFFF << 16;\r |
| 297 | drZ80.Z80IM = 0; // 1?\r |
| 298 | drZ80.Z80PC = drZ80.z80_rebasePC(0);\r |
| 299 | drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r |
| 300 | #endif\r |
| 301 | Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r |
| 302 | }\r |
| 303 | \r |
| 304 | void z80_resetCycles()\r |
| 305 | {\r |
| 306 | #if defined(_USE_MZ80)\r |
| 307 | mz80GetElapsedTicks(1);\r |
| 308 | #endif\r |
| 309 | }\r |
| 310 | \r |
| 311 | void z80_int()\r |
| 312 | {\r |
| 313 | #if defined(_USE_MZ80)\r |
| 314 | mz80int(0);\r |
| 315 | #elif defined(_USE_DRZ80)\r |
| 316 | drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r |
| 317 | drZ80.Z80_IRQ = 1;\r |
| 318 | #endif\r |
| 319 | }\r |
| 320 | \r |
| 321 | // returns number of cycles actually executed\r |
| 322 | int z80_run(int cycles)\r |
| 323 | {\r |
| 324 | #if defined(_USE_MZ80)\r |
| 325 | int ticks_pre = mz80GetElapsedTicks(0);\r |
| 326 | mz80exec(cycles);\r |
| 327 | return mz80GetElapsedTicks(0) - ticks_pre;\r |
| 328 | #elif defined(_USE_DRZ80)\r |
| 329 | return cycles - DrZ80Run(&drZ80, cycles);\r |
| 330 | #else\r |
| 331 | return cycles;\r |
| 332 | #endif\r |
| 333 | }\r |
| 334 | \r |
| 335 | void z80_pack(unsigned char *data)\r |
| 336 | {\r |
| 337 | #if defined(_USE_MZ80)\r |
| 338 | struct mz80context mz80;\r |
| 339 | *(int *)data = 0x00005A6D; // "mZ"\r |
| 340 | mz80GetContext(&mz80);\r |
| 341 | memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r |
| 342 | #elif defined(_USE_DRZ80)\r |
| 343 | *(int *)data = 0x015A7244; // "DrZ" v1\r |
| 344 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
| 345 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 346 | memcpy(data+4, &drZ80, 0x54);\r |
| 347 | #endif\r |
| 348 | }\r |
| 349 | \r |
| 350 | void z80_unpack(unsigned char *data)\r |
| 351 | {\r |
| 352 | #if defined(_USE_MZ80)\r |
| 353 | if(*(int *)data == 0x00005A6D) { // "mZ" save?\r |
| 354 | struct mz80context mz80;\r |
| 355 | mz80GetContext(&mz80);\r |
| 356 | memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r |
| 357 | mz80SetContext(&mz80);\r |
| 358 | } else {\r |
| 359 | z80_reset();\r |
| 360 | z80_int();\r |
| 361 | }\r |
| 362 | #elif defined(_USE_DRZ80)\r |
| 363 | if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r |
| 364 | memcpy(&drZ80, data+4, 0x54);\r |
| 365 | // update bases\r |
| 366 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
| 367 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 368 | } else {\r |
| 369 | z80_reset();\r |
| 370 | drZ80.Z80IM = 1;\r |
| 371 | z80_int(); // try to goto int handler, maybe we won't execute trash there?\r |
| 372 | }\r |
| 373 | #endif\r |
| 374 | }\r |
| 375 | \r |
| 376 | void z80_exit()\r |
| 377 | {\r |
| 378 | #if defined(_USE_MZ80)\r |
| 379 | mz80shutdown();\r |
| 380 | #endif\r |
| 381 | }\r |
| 382 | \r |
| 383 | #if defined(__DEBUG_PRINT) || defined(WIN32)\r |
| 384 | void z80_debug(char *dstr)\r |
| 385 | {\r |
| 386 | #if defined(_USE_DRZ80)\r |
| 387 | sprintf(dstr, "%sZ80 state: PC: %04x SP: %04x\n", dstr, drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
| 388 | #endif\r |
| 389 | }\r |
| 390 | #endif\r |