1 // This is part of Pico Library
\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
7 // For commercial use, separate licencing terms must be obtained.
\r
12 #include "sn76496.h"
\r
13 #include "../pico_int.h"
\r
14 #include "../cd/pcm.h"
\r
17 void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;
\r
19 // master int buffer to mix to
\r
20 static int PsndBuffer[2*44100/50];
\r
23 static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
\r
25 // cdda output buffer
\r
26 short cdda_out_buffer[2*1152];
\r
30 int PsndLen=0; // number of mono samples, multiply by 2 for stereo
\r
31 int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
\r
32 int PsndLen_exc_cnt=0;
\r
34 short *PsndOut=NULL; // PCM data buffer
\r
37 int timer_a_next_oflow, timer_a_step; // in z80 cycles
\r
38 int timer_b_next_oflow, timer_b_step;
\r
41 extern int *sn76496_regs;
\r
44 static void dac_recalculate(void)
\r
46 int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
\r
48 if (PsndLen <= lines)
\r
55 for(i=226; i != 225; i++)
\r
57 if (i >= lines) i = 0;
\r
65 dac_info[i] = (pos<<4)|len;
\r
73 for(i = 225; i != 224; i++)
\r
75 if (i >= lines) i = 0;
\r
77 while(dac_cnt >= 0) {
\r
81 if (i == mid) // midpoint
\r
82 while(pos+len < PsndLen/2) {
\r
87 dac_info[i] = (pos<<4)|len;
\r
91 for(len = 0, i = pos; i < PsndLen; i++) len++;
\r
92 if (PsndLen_exc_add) len++;
\r
93 dac_info[224] = (pos<<4)|len;
\r
95 mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);
\r
96 for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)
\r
98 //for(i=len=0; i < lines; i++) {
\r
99 // printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
\r
100 // len+=dac_info[i]&0xf;
\r
102 //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
\r
103 //printf("len total: %i, last pos: %i\n", len, pos);
\r
108 PICO_INTERNAL void PsndReset(void)
\r
112 // also clear the internal registers+addr line
\r
113 ym2612_regs = YM2612GetRegs();
\r
114 memset(ym2612_regs, 0, 0x200+4);
\r
121 // to be called after changing sound rate or chips
\r
122 void PsndRerate(int preserve_state)
\r
124 void *state = NULL;
\r
125 int target_fps = Pico.m.pal ? 50 : 60;
\r
127 // not all rates are supported in MCD mode due to mp3 decoder limitations
\r
128 if (PicoAHW & PAHW_MCD) {
\r
129 if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
\r
130 PicoOpt |= POPT_EN_STEREO; // force stereo
\r
133 if (preserve_state) {
\r
134 state = malloc(0x200);
\r
135 if (state == NULL) return;
\r
136 memcpy(state, YM2612GetRegs(), 0x200);
\r
138 YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
\r
139 if (preserve_state) {
\r
140 // feed it back it's own registers, just like after loading state
\r
141 memcpy(YM2612GetRegs(), state, 0x200);
\r
142 ym2612_unpack_state();
\r
143 if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
\r
147 if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
\r
148 SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
\r
149 if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
\r
154 // calculate PsndLen
\r
155 PsndLen=PsndRate / target_fps;
\r
156 PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
\r
159 // recalculate dac info
\r
162 if (PicoAHW & PAHW_MCD)
\r
163 pcm_set_rate(PsndRate);
\r
165 // clear all buffers
\r
166 memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
\r
167 memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));
\r
172 PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;
\r
174 if (PicoAHW & PAHW_PICO)
\r
179 PICO_INTERNAL void PsndDoDAC(int line_to)
\r
181 int pos, pos1, len;
\r
182 int dout = ym2612.dacout;
\r
183 int line_from = PsndDacLine;
\r
185 PsndDacLine = line_to + 1;
\r
187 pos =dac_info[line_from]>>4;
\r
188 pos1=dac_info[line_to];
\r
189 len = ((pos1>>4)-pos) + (pos1&0xf);
\r
192 if (PicoOpt & POPT_EN_STEREO) {
\r
193 short *d = PsndOut + pos*2;
\r
194 for (; len > 0; len--, d+=2) *d = dout;
\r
196 short *d = PsndOut + pos;
\r
197 for (; len > 0; len--, d++) *d = dout;
\r
202 int *d = PsndBuffer;
\r
203 d += (PicoOpt&8) ? pos*2 : pos;
\r
204 pcm_update(d, len, 1);
\r
210 static pm_file *cdda_stream = NULL;
\r
212 static void cdda_raw_update(int *buffer, int length)
\r
214 int ret, cdda_bytes;
\r
215 if (cdda_stream == NULL) return;
\r
217 cdda_bytes = length*4;
\r
218 if (PsndRate <= 22050) cdda_bytes *= 2;
\r
219 if (PsndRate < 22050) cdda_bytes *= 2;
\r
221 ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);
\r
222 if (ret < cdda_bytes) {
\r
223 memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);
\r
224 cdda_stream = NULL;
\r
229 switch (PsndRate) {
\r
230 case 44100: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;
\r
231 case 22050: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;
\r
232 case 11025: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;
\r
236 PICO_INTERNAL void cdda_start_play(void)
\r
238 int lba_offset, index, lba_length, i;
\r
240 elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);
\r
242 index = Pico_mcd->scd.Cur_Track - 1;
\r
244 lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);
\r
245 if (lba_offset < 0) lba_offset = 0;
\r
246 lba_offset += Pico_mcd->TOC.Tracks[index].Offset;
\r
248 // find the actual file for this track
\r
249 for (i = index; i >= 0; i--)
\r
250 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
\r
252 if (Pico_mcd->TOC.Tracks[i].F == NULL) {
\r
253 elprintf(EL_STATUS|EL_ANOMALY, "no track?!");
\r
257 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)
\r
261 lba_length = Pico_mcd->TOC.Tracks[i].Length;
\r
262 for (i++; i < Pico_mcd->TOC.Last_Track; i++) {
\r
263 if (Pico_mcd->TOC.Tracks[i].F != NULL) break;
\r
264 lba_length += Pico_mcd->TOC.Tracks[i].Length;
\r
268 pos1024 = lba_offset * 1024 / lba_length;
\r
270 mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);
\r
274 cdda_stream = Pico_mcd->TOC.Tracks[i].F;
\r
275 PicoCDBufferFlush(); // buffering relies on fp not being touched
\r
276 pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);
\r
277 if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)
\r
279 // skip headers, assume it's 44kHz stereo uncompressed
\r
280 pm_seek(cdda_stream, 44, SEEK_CUR);
\r
285 PICO_INTERNAL void PsndClear(void)
\r
288 if (PsndLen_exc_add) len++;
\r
289 if (PicoOpt & POPT_EN_STEREO)
\r
290 memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
\r
292 short *out = PsndOut;
\r
293 if ((int)out & 2) { *out++ = 0; len--; }
\r
294 memset32((int *) out, 0, len/2);
\r
295 if (len & 1) out[len-1] = 0;
\r
300 PICO_INTERNAL int PsndRender(int offset, int length)
\r
302 int buf32_updated = 0;
\r
303 int *buf32 = PsndBuffer+offset;
\r
304 int stereo = (PicoOpt & 8) >> 3;
\r
305 // emulating CD && PCM option enabled && PCM chip on && have enabled channels
\r
306 int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&
\r
307 (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
\r
310 #if !SIMPLE_WRITE_SOUND
\r
311 if (offset == 0) { // should happen once per frame
\r
312 // compensate for float part of PsndLen
\r
313 PsndLen_exc_cnt += PsndLen_exc_add;
\r
314 if (PsndLen_exc_cnt >= 0x10000) {
\r
315 PsndLen_exc_cnt -= 0x10000;
\r
322 if (PicoOpt & POPT_EN_PSG)
\r
323 SN76496Update(PsndOut+offset, length, stereo);
\r
325 if (PicoAHW & PAHW_PICO) {
\r
326 PicoPicoPCMUpdate(PsndOut+offset, length, stereo);
\r
330 // Add in the stereo FM buffer
\r
331 if (PicoOpt & POPT_EN_FM) {
\r
332 buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
\r
334 memset32(buf32, 0, length<<stereo);
\r
336 //printf("active_chs: %02x\n", buf32_updated);
\r
340 pcm_update(buf32, length, stereo);
\r
341 //buf32_updated = 1;
\r
345 // CD mode, cdda enabled, not data track, CDC is reading
\r
346 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&
\r
347 !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
\r
349 // note: only 44, 22 and 11 kHz supported, with forced stereo
\r
350 int index = Pico_mcd->scd.Cur_Track - 1;
\r
352 if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)
\r
353 mp3_update(buf32, length, stereo);
\r
355 cdda_raw_update(buf32, length);
\r
358 // convert + limit to normal 16bit output
\r
359 PsndMix_32_to_16l(PsndOut+offset, buf32, length);
\r
365 // -----------------------------------------------------------------
\r
370 // memhandlers for mz80 core
\r
371 unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
\r
372 void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
\r
374 // structures for mz80 core
\r
375 static struct MemoryReadByte mz80_mem_read[]=
\r
377 {0x0000,0xffff,mz80_read},
\r
378 {(UINT32) -1,(UINT32) -1,NULL}
\r
380 static struct MemoryWriteByte mz80_mem_write[]=
\r
382 {0x0000,0xffff,mz80_write},
\r
383 {(UINT32) -1,(UINT32) -1,NULL}
\r
385 static struct z80PortRead mz80_io_read[] ={
\r
386 {(UINT16) -1,(UINT16) -1,NULL}
\r
388 static struct z80PortWrite mz80_io_write[]={
\r
389 {(UINT16) -1,(UINT16) -1,NULL}
\r
392 int mz80_run(int cycles)
\r
394 int ticks_pre = mz80GetElapsedTicks(0);
\r
396 return mz80GetElapsedTicks(0) - ticks_pre;
\r
403 struct DrZ80 drZ80;
\r
405 static unsigned int DrZ80_rebasePC(unsigned short a)
\r
407 drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
\r
408 return drZ80.Z80PC_BASE + a;
\r
411 static unsigned int DrZ80_rebaseSP(unsigned short a)
\r
413 drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
\r
414 return drZ80.Z80SP_BASE + a;
\r
418 #if defined(_USE_DRZ80) || defined(_USE_CZ80)
\r
419 static unsigned char z80_in(unsigned short p)
\r
421 elprintf(EL_ANOMALY, "Z80 port %04x read", p);
\r
425 static void z80_out(unsigned short p,unsigned char d)
\r
427 elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
\r
432 // z80 functionality wrappers
\r
433 PICO_INTERNAL void z80_init(void)
\r
436 struct mz80context z80;
\r
440 // Modify the default context
\r
441 mz80GetContext(&z80);
\r
443 // point mz80 stuff
\r
444 z80.z80Base=Pico.zram;
\r
445 z80.z80MemRead=mz80_mem_read;
\r
446 z80.z80MemWrite=mz80_mem_write;
\r
447 z80.z80IoRead=mz80_io_read;
\r
448 z80.z80IoWrite=mz80_io_write;
\r
450 mz80SetContext(&z80);
\r
453 memset(&drZ80, 0, sizeof(struct DrZ80));
\r
454 drZ80.z80_rebasePC=DrZ80_rebasePC;
\r
455 drZ80.z80_rebaseSP=DrZ80_rebaseSP;
\r
456 drZ80.z80_read8 =z80_read;
\r
457 drZ80.z80_read16 =NULL;
\r
458 drZ80.z80_write8 =z80_write;
\r
459 drZ80.z80_write16 =NULL;
\r
460 drZ80.z80_in =z80_in;
\r
461 drZ80.z80_out =z80_out;
\r
462 drZ80.z80_irq_callback=NULL;
\r
465 memset(&CZ80, 0, sizeof(CZ80));
\r
467 Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
\r
468 Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
\r
469 Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
\r
470 Cz80_Set_WriteB(&CZ80, z80_write);
\r
471 Cz80_Set_INPort(&CZ80, z80_in);
\r
472 Cz80_Set_OUTPort(&CZ80, z80_out);
\r
476 PICO_INTERNAL void z80_reset(void)
\r
482 memset(&drZ80, 0, 0x54);
\r
483 drZ80.Z80F = (1<<2); // set ZFlag
\r
484 drZ80.Z80F2 = (1<<2); // set ZFlag
\r
485 drZ80.Z80IX = 0xFFFF << 16;
\r
486 drZ80.Z80IY = 0xFFFF << 16;
\r
487 drZ80.Z80IM = 0; // 1?
\r
488 drZ80.z80irqvector = 0xff0000; // RST 38h
\r
489 drZ80.Z80PC = drZ80.z80_rebasePC(0);
\r
490 drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
\r
494 Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
\r
495 Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
\r
496 Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
\r
498 Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
\r
502 static int had_irq = 0, z80_ppc, z80_ops_done = 0;
\r
503 int z80_cycles_left = 0;
\r
510 static void xfail(void)
\r
512 printf("PC: %04x, %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC), z80_ppc);
\r
513 printf("z80_ops_done done: %i\n", z80_ops_done);
\r
517 int z80_run(int cycles)
\r
522 z80_cycles_left = cycles;
\r
523 z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
\r
526 printf("irq @ %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC));
\r
527 Cz80_Set_IRQ(&CZ80, 0, HOLD_LINE);
\r
532 while (z80_cycles_left > 0)
\r
534 ccz = Cz80_Exec(&CZ80, 1);
\r
535 cdrz = 1 - DrZ80Run(&drZ80, 1);
\r
537 if (drZ80.Z80_IRQ && (drZ80.Z80IF&1))
\r
538 cdrz += 1 - DrZ80Run(&drZ80, 1); // cz80 processes IRQ after EI, DrZ80 does not
\r
541 printf("cycles: %i vs %i\n", cdrz, ccz);
\r
545 if (drZ80.Z80PC - drZ80.Z80PC_BASE != Cz80_Get_Reg(&CZ80, CZ80_PC)) {
\r
546 printf("PC: %04x vs %04x\n", drZ80.Z80PC - drZ80.Z80PC_BASE, Cz80_Get_Reg(&CZ80, CZ80_PC));
\r
553 z80_cycles_left -= ccz;
\r
554 z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);
\r
557 return co - z80_cycles_left;
\r
562 PICO_INTERNAL void z80_pack(unsigned char *data)
\r
564 #if defined(_USE_MZ80)
\r
565 struct mz80context mz80;
\r
566 *(int *)data = 0x00005A6D; // "mZ"
\r
567 mz80GetContext(&mz80);
\r
568 memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
\r
569 #elif defined(_USE_DRZ80)
\r
570 *(int *)data = 0x015A7244; // "DrZ" v1
\r
571 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
\r
572 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
\r
573 memcpy(data+4, &drZ80, 0x54);
\r
574 #elif defined(_USE_CZ80)
\r
575 *(int *)data = 0x00007a43; // "Cz"
\r
576 *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
\r
577 memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
\r
581 PICO_INTERNAL void z80_unpack(unsigned char *data)
\r
583 #if defined(_USE_MZ80)
\r
584 if (*(int *)data == 0x00005A6D) { // "mZ" save?
\r
585 struct mz80context mz80;
\r
586 mz80GetContext(&mz80);
\r
587 memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
\r
588 mz80SetContext(&mz80);
\r
593 #elif defined(_USE_DRZ80)
\r
594 if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
\r
595 memcpy(&drZ80, data+4, 0x54);
\r
597 drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
\r
598 drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
\r
602 z80_int(); // try to goto int handler, maybe we won't execute trash there?
\r
604 #elif defined(_USE_CZ80)
\r
605 if (*(int *)data == 0x00007a43) { // "Cz" save?
\r
606 memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
\r
607 Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
\r
615 PICO_INTERNAL void z80_exit(void)
\r
617 #if defined(_USE_MZ80)
\r
622 #if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
\r
623 PICO_INTERNAL void z80_debug(char *dstr)
\r
625 #if defined(_USE_DRZ80)
\r
626 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
\r
627 #elif defined(_USE_CZ80)
\r
628 sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
\r