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basic psp snd + cz80
[picodrive.git] / Pico / sound / sound.c
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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#elif defined(_USE_CZ80)\r
19#include "../../cpu/cz80/cz80.h"\r
20#endif\r
21\r
22#include "../PicoInt.h"\r
23#include "../cd/pcm.h"\r
24#include "mix.h"\r
25\r
26// master int buffer to mix to\r
27static int PsndBuffer[2*44100/50];\r
28\r
29// dac\r
30static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
31\r
32// for Pico\r
33int PsndRate=0;\r
34int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
35int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
36int PsndLen_exc_cnt=0;\r
37short *PsndOut=NULL; // PCM data buffer\r
38\r
39// from ym2612.c\r
40extern int *ym2612_dacen;\r
41extern INT32 *ym2612_dacout;\r
42void YM2612TimerHandler(int c,int cnt);\r
43\r
44// sn76496\r
45extern int *sn76496_regs;\r
46\r
47\r
48static void dac_recalculate(void)\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 = -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;\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 if (PsndLen_exc_add) len++;\r
92 dac_info[224] = (pos<<4)|len;\r
93 }\r
94 //for(i=len=0; i < lines; i++) {\r
95 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
96 // len+=dac_info[i]&0xf;\r
97 //}\r
98 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r
99 //printf("len total: %i, last pos: %i\n", len, pos);\r
100 //exit(8);\r
101}\r
102\r
103\r
104PICO_INTERNAL void sound_reset(void)\r
105{\r
106 void *ym2612_regs;\r
107\r
108 // also clear the internal registers+addr line\r
109 ym2612_regs = YM2612GetRegs();\r
110 memset(ym2612_regs, 0, 0x200+4);\r
111 z80startCycle = z80stopCycle = 0;\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
118void sound_rerate(int preserve_state)\r
119{\r
120 void *state = NULL;\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 state = malloc(0x200);\r
131 if (state == NULL) return;\r
132 memcpy(state, YM2612GetRegs(), 0x200);\r
133 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
134 Pico_mcd->m.audio_offset = mp3_get_offset();\r
135 }\r
136 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
137 if (preserve_state) {\r
138 // feed it back it's own registers, just like after loading state\r
139 memcpy(YM2612GetRegs(), state, 0x200);\r
140 YM2612PicoStateLoad();\r
141 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
142 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r
143 }\r
144\r
145 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r
146 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
147 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r
148\r
149 if (state)\r
150 free(state);\r
151\r
152 // calculate PsndLen\r
153 PsndLen=PsndRate / target_fps;\r
154 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r
155 PsndLen_exc_cnt=0;\r
156\r
157 // recalculate dac info\r
158 dac_recalculate();\r
159\r
160 if (PicoMCD & 1)\r
161 pcm_set_rate(PsndRate);\r
162\r
163 // clear all buffers\r
164 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r
165 if (PsndOut)\r
166 sound_clear();\r
167}\r
168\r
169\r
170// This is called once per raster (aka line), but not necessarily for every line\r
171PICO_INTERNAL void sound_timers_and_dac(int raster)\r
172{\r
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
195 if (len > 2)\r
196 d[4] = dout;\r
197 }\r
198 } else {\r
199 short *d = PsndOut + pos;\r
200 d[0] = dout;\r
201 if (len > 1) {\r
202 d[1] = dout;\r
203 if (len > 2)\r
204 d[2] = dout;\r
205 }\r
206 }\r
207 }\r
208\r
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
217\r
218\r
219PICO_INTERNAL void sound_clear(void)\r
220{\r
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
225}\r
226\r
227\r
228PICO_INTERNAL int sound_render(int offset, int length)\r
229{\r
230 int buf32_updated = 0;\r
231 int *buf32 = PsndBuffer+offset;\r
232 int stereo = (PicoOpt & 8) >> 3;\r
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
235 offset <<= stereo;\r
236\r
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
246 // PSG\r
247 if (PicoOpt & 2)\r
248 SN76496Update(PsndOut+offset, length, stereo);\r
249\r
250 // Add in the stereo FM buffer\r
251 if (PicoOpt & 1) {\r
252 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r
253 } else\r
254 memset32(buf32, 0, length<<stereo);\r
255\r
256//printf("active_chs: %02x\n", buf32_updated);\r
257\r
258 // CD: PCM sound\r
259 if (do_pcm) {\r
260 pcm_update(buf32, length, stereo);\r
261 //buf32_updated = 1;\r
262 }\r
263\r
264 // CD: CDDA audio\r
265 // CD mode, cdda enabled, not data track, CDC is reading\r
266 if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
267 mp3_update(buf32, length, stereo);\r
268\r
269 // convert + limit to normal 16bit output\r
270 if (stereo)\r
271 mix_32_to_16l_stereo(PsndOut+offset, buf32, length);\r
272 else mix_32_to_16_mono (PsndOut+offset, buf32, length);\r
273\r
274 return length;\r
275}\r
276\r
277\r
278\r
279#if defined(_USE_MZ80)\r
280\r
281// memhandlers for mz80 core\r
282unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r
283void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r
284\r
285// structures for mz80 core\r
286static struct MemoryReadByte mz80_mem_read[]=\r
287{\r
288 {0x0000,0xffff,mz80_read},\r
289 {(UINT32) -1,(UINT32) -1,NULL}\r
290};\r
291static struct MemoryWriteByte mz80_mem_write[]=\r
292{\r
293 {0x0000,0xffff,mz80_write},\r
294 {(UINT32) -1,(UINT32) -1,NULL}\r
295};\r
296static struct z80PortRead mz80_io_read[] ={\r
297 {(UINT16) -1,(UINT16) -1,NULL}\r
298};\r
299static struct z80PortWrite mz80_io_write[]={\r
300 {(UINT16) -1,(UINT16) -1,NULL}\r
301};\r
302\r
303#elif defined(_USE_DRZ80)\r
304\r
305static struct DrZ80 drZ80;\r
306\r
307static unsigned int DrZ80_rebasePC(unsigned short a)\r
308{\r
309 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r
310 return drZ80.Z80PC_BASE + a;\r
311}\r
312\r
313static unsigned int DrZ80_rebaseSP(unsigned short a)\r
314{\r
315 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r
316 return drZ80.Z80SP_BASE + a;\r
317}\r
318\r
319static unsigned char DrZ80_in(unsigned short p)\r
320{\r
321 elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r
322 return 0xff;\r
323}\r
324\r
325static void DrZ80_out(unsigned short p,unsigned char d)\r
326{\r
327 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r
328}\r
329\r
330static void DrZ80_irq_callback()\r
331{\r
332 drZ80.Z80_IRQ = 0; // lower irq when accepted\r
333}\r
334#endif\r
335\r
336// z80 functionality wrappers\r
337PICO_INTERNAL void z80_init(void)\r
338{\r
339#if defined(_USE_MZ80)\r
340 struct mz80context z80;\r
341\r
342 // z80\r
343 mz80init();\r
344 // Modify the default context\r
345 mz80GetContext(&z80);\r
346\r
347 // point mz80 stuff\r
348 z80.z80Base=Pico.zram;\r
349 z80.z80MemRead=mz80_mem_read;\r
350 z80.z80MemWrite=mz80_mem_write;\r
351 z80.z80IoRead=mz80_io_read;\r
352 z80.z80IoWrite=mz80_io_write;\r
353\r
354 mz80SetContext(&z80);\r
355\r
356#elif defined(_USE_DRZ80)\r
357 memset(&drZ80, 0, sizeof(struct DrZ80));\r
358 drZ80.z80_rebasePC=DrZ80_rebasePC;\r
359 drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r
360 drZ80.z80_read8 =z80_read;\r
361 drZ80.z80_read16 =z80_read16;\r
362 drZ80.z80_write8 =z80_write;\r
363 drZ80.z80_write16 =z80_write16;\r
364 drZ80.z80_in =DrZ80_in;\r
365 drZ80.z80_out =DrZ80_out;\r
366 drZ80.z80_irq_callback=DrZ80_irq_callback;\r
367\r
368#elif defined(_USE_CZ80)\r
369 memset(&CZ80, 0, sizeof(CZ80));\r
370 Cz80_Init(&CZ80);\r
371 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM\r
372 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram - 0x2000); // mirror\r
373 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read);\r
374 Cz80_Set_WriteB(&CZ80, z80_write);\r
375#endif\r
376}\r
377\r
378PICO_INTERNAL void z80_reset(void)\r
379{\r
380#if defined(_USE_MZ80)\r
381 mz80reset();\r
382#elif defined(_USE_DRZ80)\r
383 memset(&drZ80, 0, 0x54);\r
384 drZ80.Z80F = (1<<2); // set ZFlag\r
385 drZ80.Z80F2 = (1<<2); // set ZFlag\r
386 drZ80.Z80IX = 0xFFFF << 16;\r
387 drZ80.Z80IY = 0xFFFF << 16;\r
388 drZ80.Z80IM = 0; // 1?\r
389 drZ80.Z80PC = drZ80.z80_rebasePC(0);\r
390 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
391#elif defined(_USE_CZ80)\r
392 Cz80_Reset(&CZ80);\r
393#endif\r
394 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
395}\r
396\r
397PICO_INTERNAL void z80_resetCycles(void)\r
398{\r
399#if defined(_USE_MZ80)\r
400 mz80GetElapsedTicks(1);\r
401#endif\r
402}\r
403\r
404PICO_INTERNAL void z80_int(void)\r
405{\r
406#if defined(_USE_MZ80)\r
407 mz80int(0);\r
408#elif defined(_USE_DRZ80)\r
409 drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r
410 drZ80.Z80_IRQ = 1;\r
411#elif defined(_USE_CZ80)\r
412 Cz80_Set_IRQ(&CZ80, 0, HOLD_LINE);\r
413#endif\r
414}\r
415\r
416// returns number of cycles actually executed\r
417PICO_INTERNAL int z80_run(int cycles)\r
418{\r
419#if defined(_USE_MZ80)\r
420 int ticks_pre = mz80GetElapsedTicks(0);\r
421 mz80exec(cycles);\r
422 return mz80GetElapsedTicks(0) - ticks_pre;\r
423#elif defined(_USE_DRZ80)\r
424 return cycles - DrZ80Run(&drZ80, cycles);\r
425#elif defined(_USE_CZ80)\r
426 return Cz80_Exec(&CZ80, cycles);\r
427#else\r
428 return cycles;\r
429#endif\r
430}\r
431\r
432PICO_INTERNAL void z80_pack(unsigned char *data)\r
433{\r
434#if defined(_USE_MZ80)\r
435 struct mz80context mz80;\r
436 *(int *)data = 0x00005A6D; // "mZ"\r
437 mz80GetContext(&mz80);\r
438 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r
439#elif defined(_USE_DRZ80)\r
440 *(int *)data = 0x015A7244; // "DrZ" v1\r
441 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
442 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
443 memcpy(data+4, &drZ80, 0x54);\r
444#elif defined(_USE_CZ80)\r
445 *(int *)data = 0x00007a43; // "Cz"\r
446 memcpy(data+4, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
447 printf("size: %i (%x)\n", (INT32)&CZ80.BasePC - (INT32)&CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80); // FIXME rm\r
448#endif\r
449}\r
450\r
451PICO_INTERNAL void z80_unpack(unsigned char *data)\r
452{\r
453#if defined(_USE_MZ80)\r
454 if (*(int *)data == 0x00005A6D) { // "mZ" save?\r
455 struct mz80context mz80;\r
456 mz80GetContext(&mz80);\r
457 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r
458 mz80SetContext(&mz80);\r
459 } else {\r
460 z80_reset();\r
461 z80_int();\r
462 }\r
463#elif defined(_USE_DRZ80)\r
464 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r
465 memcpy(&drZ80, data+4, 0x54);\r
466 // update bases\r
467 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
468 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
469 } else {\r
470 z80_reset();\r
471 drZ80.Z80IM = 1;\r
472 z80_int(); // try to goto int handler, maybe we won't execute trash there?\r
473 }\r
474#elif defined(_USE_CZ80)\r
475 if (*(int *)data == 0x00007a43) // "Cz" save?\r
476 memcpy(&CZ80, data+4, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
477 else {\r
478 z80_reset();\r
479 z80_int();\r
480 }\r
481#endif\r
482}\r
483\r
484PICO_INTERNAL void z80_exit(void)\r
485{\r
486#if defined(_USE_MZ80)\r
487 mz80shutdown();\r
488#endif\r
489}\r
490\r
491#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)\r
492PICO_INTERNAL void z80_debug(char *dstr)\r
493{\r
494#if defined(_USE_DRZ80)\r
495 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
496#elif defined(_USE_CZ80)\r
497 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);\r
498#endif\r
499}\r
500#endif\r
fast MegaDrive/MegaCD/32X emulator