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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 2006,2007 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#include "../PicoInt.h"\r
15#include "../cd/pcm.h"\r
16#include "mix.h"\r
17\r
18void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;\r
19\r
20// master int buffer to mix to\r
21static int PsndBuffer[2*44100/50];\r
22\r
23// dac\r
24static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
25\r
26// for Pico\r
27int PsndRate=0;\r
28int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
29int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
30int PsndLen_exc_cnt=0;\r
31short *PsndOut=NULL; // PCM data buffer\r
32\r
33// sn76496\r
34extern int *sn76496_regs;\r
35\r
36\r
37static void dac_recalculate(void)\r
38{\r
39 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r
40\r
41 if(PsndLen <= lines) {\r
42 // shrinking algo\r
43 dac_cnt = -PsndLen;\r
44 len=1; pos=0;\r
45 dac_info[225] = 1;\r
46\r
47 for(i=226; i != 225; i++) {\r
48 if (i >= lines) i = 0;\r
49 len = 0;\r
50 if(dac_cnt < 0) {\r
51 len=1;\r
52 pos++;\r
53 dac_cnt += lines;\r
54 }\r
55 dac_cnt -= PsndLen;\r
56 dac_info[i] = (pos<<4)|len;\r
57 }\r
58 } else {\r
59 // stretching\r
60 dac_cnt = PsndLen;\r
61 pos=0;\r
62 for(i = 225; i != 224; i++) {\r
63 if (i >= lines) i = 0;\r
64 len=0;\r
65 while(dac_cnt >= 0) {\r
66 dac_cnt -= lines;\r
67 len++;\r
68 }\r
69 if (i == mid) // midpoint\r
70 while(pos+len < PsndLen/2) {\r
71 dac_cnt -= lines;\r
72 len++;\r
73 }\r
74 dac_cnt += PsndLen;\r
75 dac_info[i] = (pos<<4)|len;\r
76 pos+=len;\r
77 }\r
78 // last sample\r
79 for(len = 0, i = pos; i < PsndLen; i++) len++;\r
80 if (PsndLen_exc_add) len++;\r
81 dac_info[224] = (pos<<4)|len;\r
82 }\r
83 //for(i=len=0; i < lines; i++) {\r
84 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
85 // len+=dac_info[i]&0xf;\r
86 //}\r
87 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r
88 //printf("len total: %i, last pos: %i\n", len, pos);\r
89 //exit(8);\r
90}\r
91\r
92\r
93PICO_INTERNAL void PsndReset(void)\r
94{\r
95 void *ym2612_regs;\r
96\r
97 // also clear the internal registers+addr line\r
98 ym2612_regs = YM2612GetRegs();\r
99 memset(ym2612_regs, 0, 0x200+4);\r
100 z80startCycle = z80stopCycle = 0;\r
101\r
102 PsndRerate(0);\r
103}\r
104\r
105\r
106// to be called after changing sound rate or chips\r
107void PsndRerate(int preserve_state)\r
108{\r
109 void *state = NULL;\r
110 int target_fps = Pico.m.pal ? 50 : 60;\r
111\r
112 // not all rates are supported in MCD mode due to mp3 decoder limitations\r
113 if (PicoMCD & 1) {\r
114 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;\r
115 PicoOpt |= 8; // force stereo\r
116 }\r
117\r
118 if (preserve_state) {\r
119 state = malloc(0x200);\r
120 if (state == NULL) return;\r
121 memcpy(state, YM2612GetRegs(), 0x200);\r
122 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
123 Pico_mcd->m.audio_offset = mp3_get_offset();\r
124 }\r
125 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
126 if (preserve_state) {\r
127 // feed it back it's own registers, just like after loading state\r
128 memcpy(YM2612GetRegs(), state, 0x200);\r
129 YM2612PicoStateLoad();\r
130 if ((PicoMCD & 1) && Pico_mcd->m.audio_track)\r
131 mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);\r
132 }\r
133\r
134 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r
135 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
136 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r
137\r
138 if (state)\r
139 free(state);\r
140\r
141 // calculate PsndLen\r
142 PsndLen=PsndRate / target_fps;\r
143 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r
144 PsndLen_exc_cnt=0;\r
145\r
146 // recalculate dac info\r
147 dac_recalculate();\r
148\r
149 if (PicoMCD & 1)\r
150 pcm_set_rate(PsndRate);\r
151\r
152 // clear all buffers\r
153 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r
154 if (PsndOut)\r
155 PsndClear();\r
156\r
157 // set mixer\r
158 PsndMix_32_to_16l = (PicoOpt & 8) ? mix_32_to_16l_stereo : mix_32_to_16_mono;\r
159}\r
160\r
161\r
162// This is called once per raster (aka line), but not necessarily for every line\r
163PICO_INTERNAL void Psnd_timers_and_dac(int raster)\r
164{\r
165 int pos, len;\r
166 int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;\r
167// int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);\r
168\r
169 // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r
170 YM2612PicoTick(1);\r
171\r
172 if (!do_dac /*&& !do_pcm*/) return;\r
173\r
174 pos=dac_info[raster], len=pos&0xf;\r
175 if (!len) return;\r
176\r
177 pos>>=4;\r
178\r
179 if (do_dac) {\r
180 short *d = PsndOut + pos*2;\r
181 int dout = *ym2612_dacout;\r
182 if(PicoOpt&8) {\r
183 // some manual loop unrolling here :)\r
184 d[0] = dout;\r
185 if (len > 1) {\r
186 d[2] = dout;\r
187 if (len > 2)\r
188 d[4] = dout;\r
189 }\r
190 } else {\r
191 short *d = PsndOut + pos;\r
192 d[0] = dout;\r
193 if (len > 1) {\r
194 d[1] = dout;\r
195 if (len > 2)\r
196 d[2] = dout;\r
197 }\r
198 }\r
199 }\r
200\r
201#if 0\r
202 if (do_pcm) {\r
203 int *d = PsndBuffer;\r
204 d += (PicoOpt&8) ? pos*2 : pos;\r
205 pcm_update(d, len, 1);\r
206 }\r
207#endif\r
208}\r
209\r
210\r
211PICO_INTERNAL void PsndClear(void)\r
212{\r
213 int len = PsndLen;\r
214 if (PsndLen_exc_add) len++;\r
215 if (PicoOpt & 8)\r
216 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r
217 else {\r
218 short *out = PsndOut;\r
219 if ((int)out & 2) { *out++ = 0; len--; }\r
220 memset32((int *) out, 0, len/2);\r
221 if (len & 1) out[len-1] = 0;\r
222 }\r
223}\r
224\r
225\r
226PICO_INTERNAL int PsndRender(int offset, int length)\r
227{\r
228 int buf32_updated = 0;\r
229 int *buf32 = PsndBuffer+offset;\r
230 int stereo = (PicoOpt & 8) >> 3;\r
231 // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r
232 int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r
233 offset <<= stereo;\r
234\r
235#if !SIMPLE_WRITE_SOUND\r
236 if (offset == 0) { // should happen once per frame\r
237 // compensate for float part of PsndLen\r
238 PsndLen_exc_cnt += PsndLen_exc_add;\r
239 if (PsndLen_exc_cnt >= 0x10000) {\r
240 PsndLen_exc_cnt -= 0x10000;\r
241 length++;\r
242 }\r
243 }\r
244#endif\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 PsndMix_32_to_16l(PsndOut+offset, buf32, length);\r
271\r
272 return length;\r
273}\r
274\r
275\r
276\r
277#if defined(_USE_MZ80)\r
278\r
279// memhandlers for mz80 core\r
280unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }\r
281void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r
282\r
283// structures for mz80 core\r
284static struct MemoryReadByte mz80_mem_read[]=\r
285{\r
286 {0x0000,0xffff,mz80_read},\r
287 {(UINT32) -1,(UINT32) -1,NULL}\r
288};\r
289static struct MemoryWriteByte mz80_mem_write[]=\r
290{\r
291 {0x0000,0xffff,mz80_write},\r
292 {(UINT32) -1,(UINT32) -1,NULL}\r
293};\r
294static struct z80PortRead mz80_io_read[] ={\r
295 {(UINT16) -1,(UINT16) -1,NULL}\r
296};\r
297static struct z80PortWrite mz80_io_write[]={\r
298 {(UINT16) -1,(UINT16) -1,NULL}\r
299};\r
300\r
301int mz80_run(int cycles)\r
302{\r
303 int ticks_pre = mz80GetElapsedTicks(0);\r
304 mz80exec(cycles);\r
305 return mz80GetElapsedTicks(0) - ticks_pre;\r
306}\r
307\r
308#elif defined(_USE_DRZ80)\r
309\r
310struct DrZ80 drZ80;\r
311\r
312static unsigned int DrZ80_rebasePC(unsigned short a)\r
313{\r
314 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r
315 return drZ80.Z80PC_BASE + a;\r
316}\r
317\r
318static unsigned int DrZ80_rebaseSP(unsigned short a)\r
319{\r
320 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r
321 return drZ80.Z80SP_BASE + a;\r
322}\r
323\r
324static void DrZ80_irq_callback()\r
325{\r
326 drZ80.Z80_IRQ = 0; // lower irq when accepted\r
327}\r
328#endif\r
329\r
330#if defined(_USE_DRZ80) || defined(_USE_CZ80)\r
331static unsigned char z80_in(unsigned short p)\r
332{\r
333 elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r
334 return 0xff;\r
335}\r
336\r
337static void z80_out(unsigned short p,unsigned char d)\r
338{\r
339 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r
340}\r
341#endif\r
342\r
343\r
344// z80 functionality wrappers\r
345PICO_INTERNAL void z80_init(void)\r
346{\r
347#if defined(_USE_MZ80)\r
348 struct mz80context z80;\r
349\r
350 // z80\r
351 mz80init();\r
352 // Modify the default context\r
353 mz80GetContext(&z80);\r
354\r
355 // point mz80 stuff\r
356 z80.z80Base=Pico.zram;\r
357 z80.z80MemRead=mz80_mem_read;\r
358 z80.z80MemWrite=mz80_mem_write;\r
359 z80.z80IoRead=mz80_io_read;\r
360 z80.z80IoWrite=mz80_io_write;\r
361\r
362 mz80SetContext(&z80);\r
363\r
364#elif defined(_USE_DRZ80)\r
365 memset(&drZ80, 0, sizeof(struct DrZ80));\r
366 drZ80.z80_rebasePC=DrZ80_rebasePC;\r
367 drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r
368 drZ80.z80_read8 =z80_read;\r
369 drZ80.z80_read16 =z80_read16;\r
370 drZ80.z80_write8 =z80_write;\r
371 drZ80.z80_write16 =z80_write16;\r
372 drZ80.z80_in =z80_in;\r
373 drZ80.z80_out =z80_out;\r
374 drZ80.z80_irq_callback=DrZ80_irq_callback;\r
375\r
376#elif defined(_USE_CZ80)\r
377 memset(&CZ80, 0, sizeof(CZ80));\r
378 Cz80_Init(&CZ80);\r
379 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM\r
380 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror\r
381 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)\r
382 Cz80_Set_WriteB(&CZ80, z80_write);\r
383 Cz80_Set_INPort(&CZ80, z80_in);\r
384 Cz80_Set_OUTPort(&CZ80, z80_out);\r
385#endif\r
386}\r
387\r
388PICO_INTERNAL void z80_reset(void)\r
389{\r
390#if defined(_USE_MZ80)\r
391 mz80reset();\r
392#elif defined(_USE_DRZ80)\r
393 memset(&drZ80, 0, 0x54);\r
394 drZ80.Z80F = (1<<2); // set ZFlag\r
395 drZ80.Z80F2 = (1<<2); // set ZFlag\r
396 drZ80.Z80IX = 0xFFFF << 16;\r
397 drZ80.Z80IY = 0xFFFF << 16;\r
398 drZ80.Z80IM = 0; // 1?\r
399 drZ80.Z80PC = drZ80.z80_rebasePC(0);\r
400 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
401#elif defined(_USE_CZ80)\r
402 Cz80_Reset(&CZ80);\r
403 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);\r
404 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);\r
405 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);\r
406#endif\r
407 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
408}\r
409\r
410\r
411PICO_INTERNAL void z80_pack(unsigned char *data)\r
412{\r
413#if defined(_USE_MZ80)\r
414 struct mz80context mz80;\r
415 *(int *)data = 0x00005A6D; // "mZ"\r
416 mz80GetContext(&mz80);\r
417 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r
418#elif defined(_USE_DRZ80)\r
419 *(int *)data = 0x015A7244; // "DrZ" v1\r
420 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
421 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
422 memcpy(data+4, &drZ80, 0x54);\r
423#elif defined(_USE_CZ80)\r
424 *(int *)data = 0x00007a43; // "Cz"\r
425 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
426 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
427#endif\r
428}\r
429\r
430PICO_INTERNAL void z80_unpack(unsigned char *data)\r
431{\r
432#if defined(_USE_MZ80)\r
433 if (*(int *)data == 0x00005A6D) { // "mZ" save?\r
434 struct mz80context mz80;\r
435 mz80GetContext(&mz80);\r
436 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r
437 mz80SetContext(&mz80);\r
438 } else {\r
439 z80_reset();\r
440 z80_int();\r
441 }\r
442#elif defined(_USE_DRZ80)\r
443 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r
444 memcpy(&drZ80, data+4, 0x54);\r
445 // update bases\r
446 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
447 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
448 } else {\r
449 z80_reset();\r
450 drZ80.Z80IM = 1;\r
451 z80_int(); // try to goto int handler, maybe we won't execute trash there?\r
452 }\r
453#elif defined(_USE_CZ80)\r
454 if (*(int *)data == 0x00007a43) { // "Cz" save?\r
455 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
456 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));\r
457 } else {\r
458 z80_reset();\r
459 z80_int();\r
460 }\r
461#endif\r
462}\r
463\r
464PICO_INTERNAL void z80_exit(void)\r
465{\r
466#if defined(_USE_MZ80)\r
467 mz80shutdown();\r
468#endif\r
469}\r
470\r
471#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)\r
472PICO_INTERNAL void z80_debug(char *dstr)\r
473{\r
474#if defined(_USE_DRZ80)\r
475 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
476#elif defined(_USE_CZ80)\r
477 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);\r
478#endif\r
479}\r
480#endif\r
fast MegaDrive/MegaCD/32X emulator