allow slightly deviated sound rates (for Wiz)

[picodrive.git] / pico / sound / sound.c

// This is part of Pico Library\r
\r
// (c) Copyright 2004 Dave, All rights reserved.\r
// (c) Copyright 2006,2007 notaz, All rights reserved.\r
// Free for non-commercial use.\r
\r
// For commercial use, separate licencing terms must be obtained.\r
\r
\r
#include <string.h>\r
#include "ym2612.h"\r
#include "sn76496.h"\r
#include "../pico_int.h"\r
#include "../cd/pcm.h"\r
#include "mix.h"\r
\r
void (*PsndMix_32_to_16l)(short *dest, int *src, int count) = mix_32_to_16l_stereo;\r
\r
// master int buffer to mix to\r
static int PsndBuffer[2*(44100+100)/50];\r
\r
// dac\r
static unsigned short dac_info[312+4]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
\r
// cdda output buffer\r
short cdda_out_buffer[2*1152];\r
\r
// for Pico\r
int PsndRate=0;\r
int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60\r
int PsndLen_exc_cnt=0;\r
int PsndDacLine=0;\r
short *PsndOut=NULL; // PCM data buffer\r
\r
// timers\r
int timer_a_next_oflow, timer_a_step; // in z80 cycles\r
int timer_b_next_oflow, timer_b_step;\r
\r
// sn76496\r
extern int *sn76496_regs;\r
\r
\r
static void dac_recalculate(void)\r
{\r
  int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;\r
\r
  if (PsndLen <= lines)\r
  {\r
    // shrinking algo\r
    dac_cnt = -PsndLen;\r
    len=1; pos=0;\r
    dac_info[225] = 1;\r
\r
    for(i=226; i != 225; i++)\r
    {\r
      if (i >= lines) i = 0;\r
      len = 0;\r
      if(dac_cnt < 0) {\r
        len=1;\r
        pos++;\r
        dac_cnt += lines;\r
      }\r
      dac_cnt -= PsndLen;\r
      dac_info[i] = (pos<<4)|len;\r
    }\r
  }\r
  else\r
  {\r
    // stretching\r
    dac_cnt = PsndLen;\r
    pos=0;\r
    for(i = 225; i != 224; i++)\r
    {\r
      if (i >= lines) i = 0;\r
      len=0;\r
      while(dac_cnt >= 0) {\r
        dac_cnt -= lines;\r
        len++;\r
      }\r
      if (i == mid) // midpoint\r
        while(pos+len < PsndLen/2) {\r
          dac_cnt -= lines;\r
          len++;\r
        }\r
      dac_cnt += PsndLen;\r
      dac_info[i] = (pos<<4)|len;\r
      pos+=len;\r
    }\r
    // last sample\r
    for(len = 0, i = pos; i < PsndLen; i++) len++;\r
    if (PsndLen_exc_add) len++;\r
    dac_info[224] = (pos<<4)|len;\r
  }\r
  mid = (dac_info[lines-1] & 0xfff0) + ((dac_info[lines-1] & 0xf) << 4);\r
  for (i = lines; i < sizeof(dac_info) / sizeof(dac_info[0]); i++)\r
    dac_info[i] = mid;\r
  //for(i=len=0; i < lines; i++) {\r
  //  printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);\r
  //  len+=dac_info[i]&0xf;\r
  //}\r
  //printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));\r
  //printf("len total: %i, last pos: %i\n", len, pos);\r
  //exit(8);\r
}\r
\r
\r
PICO_INTERNAL void PsndReset(void)\r
{\r
  void *ym2612_regs;\r
\r
  // also clear the internal registers+addr line\r
  ym2612_regs = YM2612GetRegs();\r
  memset(ym2612_regs, 0, 0x200+4);\r
  timers_reset();\r
\r
  PsndRerate(0);\r
}\r
\r
\r
// to be called after changing sound rate or chips\r
void PsndRerate(int preserve_state)\r
{\r
  void *state = NULL;\r
  int target_fps = Pico.m.pal ? 50 : 60;\r
\r
  // not all rates are supported in MCD mode due to mp3 decoder limitations\r
  if (PicoAHW & PAHW_MCD) {\r
    if (!(11025-100 <= PsndRate && PsndRate <= 11025+100) &&\r
        !(22050-100 <= PsndRate && PsndRate <= 22050+100) &&\r
        !(44100-100 <= PsndRate && PsndRate <= 44100+100))\r
      PsndRate = 22050;\r
    PicoOpt |= POPT_EN_STEREO; // force stereo\r
  }\r
\r
  if (preserve_state) {\r
    state = malloc(0x204);\r
    if (state == NULL) return;\r
    ym2612_pack_state();\r
    memcpy(state, YM2612GetRegs(), 0x204);\r
  }\r
  YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
  if (preserve_state) {\r
    // feed it back it's own registers, just like after loading state\r
    memcpy(YM2612GetRegs(), state, 0x204);\r
    ym2612_unpack_state();\r
    if ((PicoAHW & PAHW_MCD) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
      cdda_start_play();\r
  }\r
\r
  if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state\r
  SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
  if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state\r
\r
  if (state)\r
    free(state);\r
\r
  // calculate PsndLen\r
  PsndLen=PsndRate / target_fps;\r
  PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;\r
  PsndLen_exc_cnt=0;\r
\r
  // recalculate dac info\r
  dac_recalculate();\r
\r
  if (PicoAHW & PAHW_MCD)\r
    pcm_set_rate(PsndRate);\r
\r
  // clear all buffers\r
  memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);\r
  memset(cdda_out_buffer, 0, sizeof(cdda_out_buffer));\r
  if (PsndOut)\r
    PsndClear();\r
\r
  // set mixer\r
  PsndMix_32_to_16l = (PicoOpt & POPT_EN_STEREO) ? mix_32_to_16l_stereo : mix_32_to_16_mono;\r
\r
  if (PicoAHW & PAHW_PICO)\r
    PicoReratePico();\r
}\r
\r
\r
PICO_INTERNAL void PsndDoDAC(int line_to)\r
{\r
  int pos, pos1, len;\r
  int dout = ym2612.dacout;\r
  int line_from = PsndDacLine;\r
\r
  PsndDacLine = line_to + 1;\r
\r
  pos =dac_info[line_from]>>4;\r
  pos1=dac_info[line_to];\r
  len = ((pos1>>4)-pos) + (pos1&0xf);\r
  if (!len) return;\r
\r
  if (PicoOpt & POPT_EN_STEREO) {\r
    short *d = PsndOut + pos*2;\r
    for (; len > 0; len--, d+=2) *d = dout;\r
  } else {\r
    short *d = PsndOut + pos;\r
    for (; len > 0; len--, d++)  *d = dout;\r
  }\r
\r
#if 0\r
  if (do_pcm) {\r
    int *d = PsndBuffer;\r
    d += (PicoOpt&8) ? pos*2 : pos;\r
    pcm_update(d, len, 1);\r
  }\r
#endif\r
}\r
\r
// cdda\r
static pm_file *cdda_stream = NULL;\r
\r
static void cdda_raw_update(int *buffer, int length)\r
{\r
  int ret, cdda_bytes, mult = 1;\r
  if (cdda_stream == NULL)\r
    return;\r
\r
  cdda_bytes = length*4;\r
  if (PsndRate <= 22050 + 100) mult = 2;\r
  if (PsndRate <  22050 - 100) mult = 4;\r
  cdda_bytes *= mult;\r
\r
  ret = pm_read(cdda_out_buffer, cdda_bytes, cdda_stream);\r
  if (ret < cdda_bytes) {\r
    memset((char *)cdda_out_buffer + ret, 0, cdda_bytes - ret);\r
    cdda_stream = NULL;\r
    return;\r
  }\r
\r
  // now mix\r
  switch (mult) {\r
    case 1: mix_16h_to_32(buffer, cdda_out_buffer, length*2); break;\r
    case 2: mix_16h_to_32_s1(buffer, cdda_out_buffer, length*2); break;\r
    case 4: mix_16h_to_32_s2(buffer, cdda_out_buffer, length*2); break;\r
  }\r
}\r
\r
PICO_INTERNAL void cdda_start_play(void)\r
{\r
  int lba_offset, index, lba_length, i;\r
\r
  elprintf(EL_STATUS, "cdda play track #%i", Pico_mcd->scd.Cur_Track);\r
\r
  index = Pico_mcd->scd.Cur_Track - 1;\r
\r
  lba_offset = Pico_mcd->scd.Cur_LBA - Track_to_LBA(index + 1);\r
  if (lba_offset < 0) lba_offset = 0;\r
  lba_offset += Pico_mcd->TOC.Tracks[index].Offset;\r
\r
  // find the actual file for this track\r
  for (i = index; i >= 0; i--)\r
    if (Pico_mcd->TOC.Tracks[i].F != NULL) break;\r
\r
  if (Pico_mcd->TOC.Tracks[i].F == NULL) {\r
    elprintf(EL_STATUS|EL_ANOMALY, "no track?!");\r
    return;\r
  }\r
\r
  if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_MP3)\r
  {\r
    int pos1024 = 0;\r
\r
    lba_length = Pico_mcd->TOC.Tracks[i].Length;\r
    for (i++; i < Pico_mcd->TOC.Last_Track; i++) {\r
      if (Pico_mcd->TOC.Tracks[i].F != NULL) break;\r
      lba_length += Pico_mcd->TOC.Tracks[i].Length;\r
    }\r
\r
    if (lba_offset)\r
      pos1024 = lba_offset * 1024 / lba_length;\r
\r
    mp3_start_play(Pico_mcd->TOC.Tracks[index].F, pos1024);\r
    return;\r
  }\r
\r
  cdda_stream = Pico_mcd->TOC.Tracks[i].F;\r
  PicoCDBufferFlush(); // buffering relies on fp not being touched\r
  pm_seek(cdda_stream, lba_offset * 2352, SEEK_SET);\r
  if (Pico_mcd->TOC.Tracks[i].ftype == TYPE_WAV)\r
  {\r
    // skip headers, assume it's 44kHz stereo uncompressed\r
    pm_seek(cdda_stream, 44, SEEK_CUR);\r
  }\r
}\r
\r
\r
PICO_INTERNAL void PsndClear(void)\r
{\r
  int len = PsndLen;\r
  if (PsndLen_exc_add) len++;\r
  if (PicoOpt & POPT_EN_STEREO)\r
    memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned\r
  else {\r
    short *out = PsndOut;\r
    if ((int)out & 2) { *out++ = 0; len--; }\r
    memset32((int *) out, 0, len/2);\r
    if (len & 1) out[len-1] = 0;\r
  }\r
}\r
\r
\r
static int PsndRender(int offset, int length)\r
{\r
  int  buf32_updated = 0;\r
  int *buf32 = PsndBuffer+offset;\r
  int stereo = (PicoOpt & 8) >> 3;\r
  // emulating CD && PCM option enabled && PCM chip on && have enabled channels\r
  int do_pcm = (PicoAHW & PAHW_MCD) && (PicoOpt&POPT_EN_MCD_PCM) &&\r
		(Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;\r
  offset <<= stereo;\r
\r
#if !SIMPLE_WRITE_SOUND\r
  if (offset == 0) { // should happen once per frame\r
    // compensate for float part of PsndLen\r
    PsndLen_exc_cnt += PsndLen_exc_add;\r
    if (PsndLen_exc_cnt >= 0x10000) {\r
      PsndLen_exc_cnt -= 0x10000;\r
      length++;\r
    }\r
  }\r
#endif\r
\r
  // PSG\r
  if (PicoOpt & POPT_EN_PSG)\r
    SN76496Update(PsndOut+offset, length, stereo);\r
\r
  if (PicoAHW & PAHW_PICO) {\r
    PicoPicoPCMUpdate(PsndOut+offset, length, stereo);\r
    return length;\r
  }\r
\r
  // Add in the stereo FM buffer\r
  if (PicoOpt & POPT_EN_FM) {\r
    buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);\r
  } else\r
    memset32(buf32, 0, length<<stereo);\r
\r
//printf("active_chs: %02x\n", buf32_updated);\r
\r
  // CD: PCM sound\r
  if (do_pcm) {\r
    pcm_update(buf32, length, stereo);\r
    //buf32_updated = 1;\r
  }\r
\r
  // CD: CDDA audio\r
  // CD mode, cdda enabled, not data track, CDC is reading\r
  if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_CDDA) &&\r
		!(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))\r
  {\r
    // note: only 44, 22 and 11 kHz supported, with forced stereo\r
    int index = Pico_mcd->scd.Cur_Track - 1;\r
\r
    if (Pico_mcd->TOC.Tracks[index].ftype == TYPE_MP3)\r
      mp3_update(buf32, length, stereo);\r
    else\r
      cdda_raw_update(buf32, length);\r
  }\r
\r
  // convert + limit to normal 16bit output\r
  PsndMix_32_to_16l(PsndOut+offset, buf32, length);\r
\r
  return length;\r
}\r
\r
// to be called on 224 or line_sample scanlines only\r
PICO_INTERNAL void PsndGetSamples(int y)\r
{\r
#if SIMPLE_WRITE_SOUND\r
  if (y != 224) return;\r
  PsndRender(0, PsndLen);\r
  if (PicoWriteSound) PicoWriteSound(PsndLen);\r
  PsndClear();\r
#else\r
  static int curr_pos = 0;\r
\r
  if (y == 224)\r
  {\r
    if (emustatus & 2)\r
         curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);\r
    else curr_pos  = PsndRender(0, PsndLen);\r
    if (emustatus&1) emustatus|=2; else emustatus&=~2;\r
    if (PicoWriteSound) PicoWriteSound(curr_pos);\r
    // clear sound buffer\r
    PsndClear();\r
  }\r
  else if (emustatus & 3) {\r
    emustatus|= 2;\r
    emustatus&=~1;\r
    curr_pos = PsndRender(0, PsndLen/2);\r
  }\r
#endif\r
}\r
\r
\r
// -----------------------------------------------------------------\r
//                            z80 stuff\r
\r
#ifdef _USE_MZ80\r
\r
// memhandlers for mz80 core\r
unsigned char mz80_read(UINT32 a,  struct MemoryReadByte *w)  { return z80_read(a); }\r
void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }\r
\r
// structures for mz80 core\r
static struct MemoryReadByte mz80_mem_read[]=\r
{\r
  {0x0000,0xffff,mz80_read},\r
  {(UINT32) -1,(UINT32) -1,NULL}\r
};\r
static struct MemoryWriteByte mz80_mem_write[]=\r
{\r
  {0x0000,0xffff,mz80_write},\r
  {(UINT32) -1,(UINT32) -1,NULL}\r
};\r
static struct z80PortRead mz80_io_read[] ={\r
  {(UINT16) -1,(UINT16) -1,NULL}\r
};\r
static struct z80PortWrite mz80_io_write[]={\r
  {(UINT16) -1,(UINT16) -1,NULL}\r
};\r
\r
int mz80_run(int cycles)\r
{\r
  int ticks_pre = mz80GetElapsedTicks(0);\r
  mz80exec(cycles);\r
  return mz80GetElapsedTicks(0) - ticks_pre;\r
}\r
\r
#endif\r
\r
#ifdef _USE_DRZ80\r
\r
struct DrZ80 drZ80;\r
\r
static unsigned int DrZ80_rebasePC(unsigned short a)\r
{\r
  drZ80.Z80PC_BASE = (unsigned int) Pico.zram;\r
  return drZ80.Z80PC_BASE + a;\r
}\r
\r
static unsigned int DrZ80_rebaseSP(unsigned short a)\r
{\r
  drZ80.Z80SP_BASE = (unsigned int) Pico.zram;\r
  return drZ80.Z80SP_BASE + a;\r
}\r
#endif\r
\r
#if defined(_USE_DRZ80) || defined(_USE_CZ80)\r
static unsigned char z80_in(unsigned short p)\r
{\r
  elprintf(EL_ANOMALY, "Z80 port %04x read", p);\r
  return 0xff;\r
}\r
\r
static void z80_out(unsigned short p,unsigned char d)\r
{\r
  elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);\r
}\r
#endif\r
\r
\r
// z80 functionality wrappers\r
PICO_INTERNAL void z80_init(void)\r
{\r
#ifdef _USE_MZ80\r
  struct mz80context z80;\r
\r
  // z80\r
  mz80init();\r
  // Modify the default context\r
  mz80GetContext(&z80);\r
\r
  // point mz80 stuff\r
  z80.z80Base=Pico.zram;\r
  z80.z80MemRead=mz80_mem_read;\r
  z80.z80MemWrite=mz80_mem_write;\r
  z80.z80IoRead=mz80_io_read;\r
  z80.z80IoWrite=mz80_io_write;\r
\r
  mz80SetContext(&z80);\r
#endif\r
#ifdef _USE_DRZ80\r
  memset(&drZ80, 0, sizeof(struct DrZ80));\r
  drZ80.z80_rebasePC=DrZ80_rebasePC;\r
  drZ80.z80_rebaseSP=DrZ80_rebaseSP;\r
  drZ80.z80_read8   =z80_read;\r
  drZ80.z80_read16  =NULL;\r
  drZ80.z80_write8  =z80_write;\r
  drZ80.z80_write16 =NULL;\r
  drZ80.z80_in      =z80_in;\r
  drZ80.z80_out     =z80_out;\r
  drZ80.z80_irq_callback=NULL;\r
#endif\r
#ifdef _USE_CZ80\r
  memset(&CZ80, 0, sizeof(CZ80));\r
  Cz80_Init(&CZ80);\r
  Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM\r
  Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror\r
  Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)\r
  Cz80_Set_WriteB(&CZ80, z80_write);\r
  Cz80_Set_INPort(&CZ80, z80_in);\r
  Cz80_Set_OUTPort(&CZ80, z80_out);\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_reset(void)\r
{\r
#ifdef _USE_MZ80\r
  mz80reset();\r
#endif\r
#ifdef _USE_DRZ80\r
  memset(&drZ80, 0, 0x54);\r
  drZ80.Z80F  = (1<<2);  // set ZFlag\r
  drZ80.Z80F2 = (1<<2);  // set ZFlag\r
  drZ80.Z80IX = 0xFFFF << 16;\r
  drZ80.Z80IY = 0xFFFF << 16;\r
  drZ80.Z80IM = 0; // 1?\r
  drZ80.z80irqvector = 0xff0000; // RST 38h\r
  drZ80.Z80PC = drZ80.z80_rebasePC(0);\r
  drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
#endif\r
#ifdef _USE_CZ80\r
  Cz80_Reset(&CZ80);\r
  Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);\r
  Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);\r
  Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);\r
#endif\r
  Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
}\r
\r
#if 0\r
static int had_irq = 0, z80_ppc, z80_ops_done = 0;\r
int z80_cycles_left = 0;\r
\r
void z80_int(void)\r
{\r
  had_irq = 1;\r
}\r
\r
static void xfail(void)\r
{\r
  printf("PC: %04x, %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC), z80_ppc);\r
  printf("z80_ops_done done: %i\n", z80_ops_done);\r
  exit(1);\r
}\r
\r
int  z80_run(int cycles)\r
{\r
  int fail = 0;\r
  int cdrz, ccz;\r
\r
  z80_cycles_left = cycles;\r
  z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
\r
  if (had_irq) {\r
    printf("irq @ %04x\n", Cz80_Get_Reg(&CZ80, CZ80_PC));\r
    Cz80_Set_IRQ(&CZ80, 0, HOLD_LINE);\r
    drZ80.Z80_IRQ = 1;\r
    had_irq = 0;\r
  }\r
\r
  while (z80_cycles_left > 0)\r
  {\r
    ccz = Cz80_Exec(&CZ80, 1);\r
    cdrz = 1 - DrZ80Run(&drZ80, 1);\r
\r
    if (drZ80.Z80_IRQ && (drZ80.Z80IF&1))\r
      cdrz += 1 - DrZ80Run(&drZ80, 1); // cz80 processes IRQ after EI, DrZ80 does not\r
\r
    if (cdrz != ccz) {\r
      printf("cycles: %i vs %i\n", cdrz, ccz);\r
      fail = 1;\r
    }\r
\r
    if (drZ80.Z80PC - drZ80.Z80PC_BASE != Cz80_Get_Reg(&CZ80, CZ80_PC)) {\r
      printf("PC: %04x vs %04x\n", drZ80.Z80PC - drZ80.Z80PC_BASE, Cz80_Get_Reg(&CZ80, CZ80_PC));\r
      fail = 1;\r
    }\r
\r
    if (fail) xfail();\r
\r
    z80_ops_done++;\r
    z80_cycles_left -= ccz;\r
    z80_ppc = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
  }\r
\r
  return co - z80_cycles_left;\r
}\r
#endif\r
\r
\r
PICO_INTERNAL void z80_pack(unsigned char *data)\r
{\r
#if defined(_USE_MZ80)\r
  struct mz80context mz80;\r
  *(int *)data = 0x00005A6D; // "mZ"\r
  mz80GetContext(&mz80);\r
  memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers\r
#elif defined(_USE_DRZ80)\r
  *(int *)data = 0x015A7244; // "DrZ" v1\r
  drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
  drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
  memcpy(data+4, &drZ80, 0x54);\r
#elif defined(_USE_CZ80)\r
  *(int *)data = 0x00007a43; // "Cz"\r
  *(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);\r
  memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_unpack(unsigned char *data)\r
{\r
#if defined(_USE_MZ80)\r
  if (*(int *)data == 0x00005A6D) { // "mZ" save?\r
    struct mz80context mz80;\r
    mz80GetContext(&mz80);\r
    memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);\r
    mz80SetContext(&mz80);\r
  } else {\r
    z80_reset();\r
    z80_int();\r
  }\r
#elif defined(_USE_DRZ80)\r
  if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?\r
    memcpy(&drZ80, data+4, 0x54);\r
    // update bases\r
    drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);\r
    drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);\r
  } else {\r
    z80_reset();\r
    drZ80.Z80IM = 1;\r
    z80_int(); // try to goto int handler, maybe we won't execute trash there?\r
  }\r
#elif defined(_USE_CZ80)\r
  if (*(int *)data == 0x00007a43) { // "Cz" save?\r
    memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);\r
    Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));\r
  } else {\r
    z80_reset();\r
    z80_int();\r
  }\r
#endif\r
}\r
\r
PICO_INTERNAL void z80_exit(void)\r
{\r
#if defined(_USE_MZ80)\r
  mz80shutdown();\r
#endif\r
}\r
\r
#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)\r
PICO_INTERNAL void z80_debug(char *dstr)\r
{\r
#if defined(_USE_DRZ80)\r
  sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
#elif defined(_USE_CZ80)\r
  sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);\r
#endif\r
}\r
#endif\r