cc68a136 |
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 |
4f265db7 |
26 | #include "../cd/pcm.h"\r |
27 | #include "mix.h"\r |
cc68a136 |
28 | \r |
4f265db7 |
29 | // master int buffer to mix to\r |
30 | static int PsndBuffer[2*44100/50];\r |
cc68a136 |
31 | \r |
32 | //int z80CycleAim = 0;\r |
33 | \r |
34 | // dac\r |
35 | short *dac_out;\r |
36 | unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r |
37 | \r |
38 | // for Pico\r |
39 | int PsndRate=0;\r |
40 | int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r |
7a93adeb |
41 | int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r |
42 | int PsndLen_exc_cnt=0;\r |
cc68a136 |
43 | short *PsndOut=NULL; // PCM data buffer\r |
44 | \r |
45 | // from ym2612.c\r |
46 | extern int *ym2612_dacen;\r |
47 | extern INT32 *ym2612_dacout;\r |
48 | void YM2612TimerHandler(int c,int cnt);\r |
49 | \r |
50 | // sn76496\r |
51 | extern int *sn76496_regs;\r |
52 | \r |
53 | \r |
54 | static void dac_recalculate()\r |
55 | {\r |
56 | int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r |
57 | \r |
58 | if(PsndLen <= lines) {\r |
59 | // shrinking algo\r |
7a93adeb |
60 | dac_cnt = -PsndLen;\r |
cc68a136 |
61 | len=1; pos=0;\r |
62 | dac_info[225] = 1;\r |
63 | \r |
64 | for(i=226; i != 225; i++) {\r |
65 | if (i >= lines) i = 0;\r |
66 | len = 0;\r |
67 | if(dac_cnt < 0) {\r |
68 | len=1;\r |
69 | pos++;\r |
70 | dac_cnt += lines;\r |
71 | }\r |
72 | dac_cnt -= PsndLen;\r |
73 | dac_info[i] = (pos<<4)|len;\r |
74 | }\r |
75 | } else {\r |
76 | // stretching\r |
7a93adeb |
77 | dac_cnt = PsndLen;\r |
cc68a136 |
78 | pos=0;\r |
79 | for(i = 225; i != 224; i++) {\r |
80 | if (i >= lines) i = 0;\r |
81 | len=0;\r |
82 | while(dac_cnt >= 0) {\r |
83 | dac_cnt -= lines;\r |
84 | len++;\r |
85 | }\r |
4f265db7 |
86 | if (i == mid) // midpoint\r |
cc68a136 |
87 | while(pos+len < PsndLen/2) {\r |
88 | dac_cnt -= lines;\r |
89 | len++;\r |
90 | }\r |
91 | dac_cnt += PsndLen;\r |
92 | dac_info[i] = (pos<<4)|len;\r |
93 | pos+=len;\r |
94 | }\r |
95 | // last sample\r |
96 | for(len = 0, i = pos; i < PsndLen; i++) len++;\r |
7a93adeb |
97 | if (PsndLen_exc_add) len++;\r |
cc68a136 |
98 | dac_info[224] = (pos<<4)|len;\r |
99 | }\r |
7a93adeb |
100 | //for(i=len=0; i < lines; i++) {\r |
101 | // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r |
102 | // len+=dac_info[i]&0xf;\r |
103 | //}\r |
104 | //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r |
105 | //printf("len total: %i, last pos: %i\n", len, pos);\r |
106 | //exit(8);\r |
cc68a136 |
107 | }\r |
108 | \r |
109 | \r |
110 | void sound_reset()\r |
111 | {\r |
112 | extern int z80stopCycle;\r |
113 | void *ym2612_regs;\r |
114 | \r |
cc68a136 |
115 | // also clear the internal registers+addr line\r |
116 | ym2612_regs = YM2612GetRegs();\r |
117 | memset(ym2612_regs, 0, 0x200+4);\r |
cc68a136 |
118 | z80stopCycle = 0;\r |
7a93adeb |
119 | \r |
120 | sound_rerate(0);\r |
cc68a136 |
121 | }\r |
122 | \r |
123 | \r |
124 | // to be called after changing sound rate or chips\r |
7a93adeb |
125 | void sound_rerate(int preserve_state)\r |
cc68a136 |
126 | {\r |
127 | unsigned int state[28];\r |
7a93adeb |
128 | int target_fps = Pico.m.pal ? 50 : 60;\r |
cc68a136 |
129 | \r |
7a93adeb |
130 | // not all rates are supported in MCD mode due to mp3 decoder limitations\r |
4f265db7 |
131 | if (PicoMCD & 1) {\r |
132 | if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;\r |
7a93adeb |
133 | PicoOpt |= 8; // force stereo\r |
4f265db7 |
134 | }\r |
135 | \r |
7a93adeb |
136 | if (preserve_state) {\r |
137 | if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r |
138 | Pico_mcd->m.audio_offset = mp3_get_offset();\r |
139 | }\r |
cc68a136 |
140 | YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r |
7a93adeb |
141 | if (preserve_state) {\r |
142 | // feed it back it's own registers, just like after loading state\r |
143 | YM2612PicoStateLoad();\r |
144 | if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r |
145 | mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r |
146 | }\r |
cc68a136 |
147 | \r |
7a93adeb |
148 | if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r |
cc68a136 |
149 | SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r |
7a93adeb |
150 | if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r |
cc68a136 |
151 | \r |
152 | // calculate PsndLen\r |
7a93adeb |
153 | PsndLen=PsndRate / target_fps;\r |
154 | PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r |
155 | PsndLen_exc_cnt=0;\r |
cc68a136 |
156 | \r |
157 | // recalculate dac info\r |
158 | dac_recalculate();\r |
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159 | \r |
160 | if (PicoMCD & 1)\r |
161 | pcm_set_rate(PsndRate);\r |
7a93adeb |
162 | \r |
163 | // clear all buffers\r |
164 | memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r |
165 | if (PsndOut)\r |
166 | sound_clear();\r |
cc68a136 |
167 | }\r |
168 | \r |
169 | \r |
170 | // This is called once per raster (aka line), but not necessarily for every line\r |
4f265db7 |
171 | void sound_timers_and_dac(int raster)\r |
cc68a136 |
172 | {\r |
4f265db7 |
173 | int pos, len;\r |
174 | int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;\r |
175 | // int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);\r |
176 | \r |
177 | // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r |
178 | YM2612PicoTick(1);\r |
179 | \r |
180 | if (!do_dac /*&& !do_pcm*/) return;\r |
181 | \r |
182 | pos=dac_info[raster], len=pos&0xf;\r |
183 | if (!len) return;\r |
184 | \r |
185 | pos>>=4;\r |
186 | \r |
187 | if (do_dac) {\r |
188 | short *d = PsndOut + pos*2;\r |
189 | int dout = *ym2612_dacout;\r |
190 | if(PicoOpt&8) {\r |
191 | // some manual loop unrolling here :)\r |
192 | d[0] = dout;\r |
193 | if (len > 1) {\r |
194 | d[2] = dout;\r |
7a93adeb |
195 | if (len > 2)\r |
4f265db7 |
196 | d[4] = dout;\r |
4f265db7 |
197 | }\r |
cc68a136 |
198 | } else {\r |
4f265db7 |
199 | short *d = PsndOut + pos;\r |
200 | d[0] = dout;\r |
201 | if (len > 1) {\r |
202 | d[1] = dout;\r |
7a93adeb |
203 | if (len > 2)\r |
4f265db7 |
204 | d[2] = dout;\r |
4f265db7 |
205 | }\r |
cc68a136 |
206 | }\r |
207 | }\r |
208 | \r |
4f265db7 |
209 | #if 0\r |
210 | if (do_pcm) {\r |
211 | int *d = PsndBuffer;\r |
212 | d += (PicoOpt&8) ? pos*2 : pos;\r |
213 | pcm_update(d, len, 1);\r |
214 | }\r |
215 | #endif\r |
216 | }\r |
cc68a136 |
217 | \r |
cc68a136 |
218 | \r |
4f265db7 |
219 | void sound_clear(void)\r |
220 | {\r |
7a93adeb |
221 | int len = PsndLen;\r |
222 | if (PsndLen_exc_add) len++;\r |
223 | if (PicoOpt & 8) memset32((int *) PsndOut, 0, len); // clear both channels at once\r |
224 | else memset(PsndOut, 0, len<<1);\r |
cc68a136 |
225 | }\r |
226 | \r |
227 | \r |
228 | int sound_render(int offset, int length)\r |
229 | {\r |
85f8e929 |
230 | int buf32_updated = 0;\r |
4f265db7 |
231 | int *buf32 = PsndBuffer+offset;\r |
cc68a136 |
232 | int stereo = (PicoOpt & 8) >> 3;\r |
4f265db7 |
233 | // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r |
234 | int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r |
cc68a136 |
235 | offset <<= stereo;\r |
236 | \r |
7a93adeb |
237 | if (offset == 0) { // should happen once per frame\r |
238 | // compensate for float part of PsndLen\r |
239 | PsndLen_exc_cnt += PsndLen_exc_add;\r |
240 | if (PsndLen_exc_cnt >= 0x10000) {\r |
241 | PsndLen_exc_cnt -= 0x10000;\r |
242 | length++;\r |
243 | }\r |
244 | }\r |
245 | \r |
cc68a136 |
246 | // PSG\r |
4f265db7 |
247 | if (PicoOpt & 2)\r |
cc68a136 |
248 | SN76496Update(PsndOut+offset, length, stereo);\r |
249 | \r |
250 | // Add in the stereo FM buffer\r |
fa1e5e29 |
251 | if (PicoOpt & 1) {\r |
85f8e929 |
252 | buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r |
fa1e5e29 |
253 | } else\r |
254 | memset32(buf32, 0, length<<stereo);\r |
85f8e929 |
255 | \r |
256 | //printf("active_chs: %02x\n", buf32_updated);\r |
4f265db7 |
257 | \r |
7a93adeb |
258 | // CD: PCM sound\r |
85f8e929 |
259 | if (do_pcm) {\r |
4f265db7 |
260 | pcm_update(buf32, length, stereo);\r |
85f8e929 |
261 | //buf32_updated = 1;\r |
262 | }\r |
4f265db7 |
263 | \r |
7a93adeb |
264 | // CD: CDDA audio\r |
abe0ea43 |
265 | if ((PicoMCD & 1) && (PicoOpt & 0x800))\r |
266 | mp3_update(buf32, length, stereo);\r |
4f265db7 |
267 | \r |
268 | // convert + limit to normal 16bit output\r |
269 | if (stereo)\r |
270 | mix_32_to_16l_stereo(PsndOut+offset, buf32, length);\r |
271 | else mix_32_to_16_mono (PsndOut+offset, buf32, length);\r |
cc68a136 |
272 | \r |
7a93adeb |
273 | return length;\r |
cc68a136 |
274 | }\r |
275 | \r |
276 | \r |
277 | \r |
278 | #if defined(_USE_MZ80)\r |
279 | \r |
280 | // memhandlers for mz80 core\r |
281 | unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r |
282 | void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r |
283 | \r |
284 | // structures for mz80 core\r |
285 | static struct MemoryReadByte mz80_mem_read[]=\r |
286 | {\r |
287 | {0x0000,0xffff,mz80_read},\r |
288 | {(UINT32) -1,(UINT32) -1,NULL}\r |
289 | };\r |
290 | static struct MemoryWriteByte mz80_mem_write[]=\r |
291 | {\r |
292 | {0x0000,0xffff,mz80_write},\r |
293 | {(UINT32) -1,(UINT32) -1,NULL}\r |
294 | };\r |
295 | static struct z80PortRead mz80_io_read[] ={\r |
296 | {(UINT16) -1,(UINT16) -1,NULL}\r |
297 | };\r |
298 | static struct z80PortWrite mz80_io_write[]={\r |
299 | {(UINT16) -1,(UINT16) -1,NULL}\r |
300 | };\r |
301 | \r |
302 | #elif defined(_USE_DRZ80)\r |
303 | \r |
304 | static struct DrZ80 drZ80;\r |
305 | \r |
306 | static unsigned int DrZ80_rebasePC(unsigned short a)\r |
307 | {\r |
308 | drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r |
309 | return drZ80.Z80PC_BASE + a;\r |
310 | }\r |
311 | \r |
312 | static unsigned int DrZ80_rebaseSP(unsigned short a)\r |
313 | {\r |
314 | drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r |
315 | return drZ80.Z80SP_BASE + a;\r |
316 | }\r |
317 | \r |
318 | static unsigned char DrZ80_in(unsigned short p)\r |
319 | {\r |
320 | return 0xff;\r |
321 | }\r |
322 | \r |
323 | static void DrZ80_out(unsigned short p,unsigned char d)\r |
324 | {\r |
325 | }\r |
326 | \r |
327 | static void DrZ80_irq_callback()\r |
328 | {\r |
329 | drZ80.Z80_IRQ = 0; // lower irq when accepted\r |
330 | }\r |
331 | \r |
332 | #endif\r |
333 | \r |
334 | // z80 functionality wrappers\r |
335 | void z80_init()\r |
336 | {\r |
337 | #if defined(_USE_MZ80)\r |
338 | struct mz80context z80;\r |
339 | \r |
340 | // z80\r |
341 | mz80init();\r |
342 | // Modify the default context\r |
343 | mz80GetContext(&z80);\r |
4f265db7 |
344 | \r |
cc68a136 |
345 | // point mz80 stuff\r |
346 | z80.z80Base=Pico.zram;\r |
347 | z80.z80MemRead=mz80_mem_read;\r |
348 | z80.z80MemWrite=mz80_mem_write;\r |
349 | z80.z80IoRead=mz80_io_read;\r |
350 | z80.z80IoWrite=mz80_io_write;\r |
4f265db7 |
351 | \r |
cc68a136 |
352 | mz80SetContext(&z80);\r |
353 | \r |
354 | #elif defined(_USE_DRZ80)\r |
355 | \r |
356 | memset(&drZ80, 0, sizeof(struct DrZ80));\r |
357 | drZ80.z80_rebasePC=DrZ80_rebasePC;\r |
358 | drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r |
359 | drZ80.z80_read8 =z80_read;\r |
360 | drZ80.z80_read16 =z80_read16;\r |
361 | drZ80.z80_write8 =z80_write;\r |
362 | drZ80.z80_write16 =z80_write16;\r |
363 | drZ80.z80_in =DrZ80_in;\r |
364 | drZ80.z80_out =DrZ80_out;\r |
365 | drZ80.z80_irq_callback=DrZ80_irq_callback;\r |
366 | #endif\r |
367 | }\r |
368 | \r |
369 | void z80_reset()\r |
370 | {\r |
371 | #if defined(_USE_MZ80)\r |
372 | mz80reset();\r |
373 | #elif defined(_USE_DRZ80)\r |
374 | memset(&drZ80, 0, 0x54);\r |
375 | drZ80.Z80F = (1<<2); // set ZFlag\r |
376 | drZ80.Z80F2 = (1<<2); // set ZFlag\r |
377 | drZ80.Z80IX = 0xFFFF << 16;\r |
378 | drZ80.Z80IY = 0xFFFF << 16;\r |
379 | drZ80.Z80IM = 0; // 1?\r |
380 | drZ80.Z80PC = drZ80.z80_rebasePC(0);\r |
381 | drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r |
382 | #endif\r |
383 | Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r |
384 | }\r |
385 | \r |
386 | void z80_resetCycles()\r |
387 | {\r |
388 | #if defined(_USE_MZ80)\r |
389 | mz80GetElapsedTicks(1);\r |
390 | #endif\r |
391 | }\r |
392 | \r |
393 | void z80_int()\r |
394 | {\r |
395 | #if defined(_USE_MZ80)\r |
396 | mz80int(0);\r |
397 | #elif defined(_USE_DRZ80)\r |
398 | drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r |
399 | drZ80.Z80_IRQ = 1;\r |
400 | #endif\r |
401 | }\r |
402 | \r |
403 | // returns number of cycles actually executed\r |
404 | int z80_run(int cycles)\r |
405 | {\r |
406 | #if defined(_USE_MZ80)\r |
407 | int ticks_pre = mz80GetElapsedTicks(0);\r |
408 | mz80exec(cycles);\r |
409 | return mz80GetElapsedTicks(0) - ticks_pre;\r |
410 | #elif defined(_USE_DRZ80)\r |
411 | return cycles - DrZ80Run(&drZ80, cycles);\r |
412 | #else\r |
413 | return cycles;\r |
414 | #endif\r |
415 | }\r |
416 | \r |
417 | void z80_pack(unsigned char *data)\r |
418 | {\r |
419 | #if defined(_USE_MZ80)\r |
420 | struct mz80context mz80;\r |
421 | *(int *)data = 0x00005A6D; // "mZ"\r |
422 | mz80GetContext(&mz80);\r |
423 | memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r |
424 | #elif defined(_USE_DRZ80)\r |
425 | *(int *)data = 0x015A7244; // "DrZ" v1\r |
426 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
427 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
428 | memcpy(data+4, &drZ80, 0x54);\r |
429 | #endif\r |
430 | }\r |
431 | \r |
432 | void z80_unpack(unsigned char *data)\r |
433 | {\r |
434 | #if defined(_USE_MZ80)\r |
435 | if(*(int *)data == 0x00005A6D) { // "mZ" save?\r |
436 | struct mz80context mz80;\r |
437 | mz80GetContext(&mz80);\r |
438 | memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r |
439 | mz80SetContext(&mz80);\r |
440 | } else {\r |
441 | z80_reset();\r |
442 | z80_int();\r |
443 | }\r |
444 | #elif defined(_USE_DRZ80)\r |
445 | if(*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r |
446 | memcpy(&drZ80, data+4, 0x54);\r |
447 | // update bases\r |
448 | drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r |
449 | drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
450 | } else {\r |
451 | z80_reset();\r |
452 | drZ80.Z80IM = 1;\r |
453 | z80_int(); // try to goto int handler, maybe we won't execute trash there?\r |
454 | }\r |
455 | #endif\r |
456 | }\r |
457 | \r |
458 | void z80_exit()\r |
459 | {\r |
460 | #if defined(_USE_MZ80)\r |
461 | mz80shutdown();\r |
462 | #endif\r |
463 | }\r |
464 | \r |
465 | #if defined(__DEBUG_PRINT) || defined(WIN32)\r |
466 | void z80_debug(char *dstr)\r |
467 | {\r |
468 | #if defined(_USE_DRZ80)\r |
469 | sprintf(dstr, "%sZ80 state: PC: %04x SP: %04x\n", dstr, drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r |
470 | #endif\r |
471 | }\r |
472 | #endif\r |