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[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 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 "sound.h"\r
#include "ym2612.h"\r
#include "sn76496.h"\r
\r
#ifndef __GNUC__\r
#pragma warning (disable:4244)\r
#endif\r
\r
#if defined(_USE_MZ80)\r
#include "../../cpu/mz80/mz80.h"\r
#elif defined(_USE_DRZ80)\r
#include "../../cpu/DrZ80/drz80.h"\r
#endif\r
\r
#include "../PicoInt.h"\r
\r
\r
//int z80CycleAim = 0;\r
\r
// dac\r
short *dac_out;\r
unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample\r
\r
// for Pico\r
int PsndRate=0;\r
int PsndLen=0; // number of mono samples, multiply by 2 for stereo\r
short *PsndOut=NULL; // PCM data buffer\r
\r
// from ym2612.c\r
extern int   *ym2612_dacen;\r
extern INT32 *ym2612_dacout;\r
void YM2612TimerHandler(int c,int cnt);\r
\r
// sn76496\r
extern int *sn76496_regs;\r
\r
\r
static void dac_recalculate()\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
    // shrinking algo\r
    dac_cnt = 0;//lines - PsndLen;\r
    len=1; pos=0;\r
    dac_info[225] = 1;\r
\r
    for(i=226; i != 225; i++) {\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
  } else {\r
    // stretching\r
    dac_cnt = PsndLen/2;\r
    pos=0;\r
    for(i = 225; i != 224; i++) {\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
    dac_info[224] = (pos<<4)|len;\r
  }\r
//  dprintf("rate is %i, len %i", PsndRate, PsndLen);\r
//  for(i=0; i < lines; i++)\r
//    dprintf("%03i : %03i : %i", i, dac_info[i]>>4, dac_info[i]&0xf);\r
//exit(8);\r
}\r
\r
\r
void sound_reset()\r
{\r
  extern int z80stopCycle;\r
  void *ym2612_regs;\r
\r
  // init even if we are not going to use them, just in case we ever enable it\r
  YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
  // also clear the internal registers+addr line\r
  ym2612_regs = YM2612GetRegs();\r
  memset(ym2612_regs, 0, 0x200+4);\r
\r
  SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
\r
  // calculate PsndLen\r
  PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r
\r
  // recalculate dac info\r
  dac_recalculate();\r
  z80stopCycle = 0;\r
}\r
\r
\r
// to be called after changing sound rate or chips\r
void sound_rerate()\r
{\r
  unsigned int state[28];\r
\r
  YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);\r
  // feed it back it's own registers, just like after loading state\r
  YM2612PicoStateLoad();\r
\r
  memcpy(state, sn76496_regs, 28*4); // remember old state\r
  SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);\r
  memcpy(sn76496_regs, state, 28*4); // restore old state\r
\r
  // calculate PsndLen\r
  PsndLen=PsndRate/(Pico.m.pal ? 50 : 60);\r
\r
  // recalculate dac info\r
  dac_recalculate();\r
}\r
\r
\r
// This is called once per raster (aka line), but not necessarily for every line\r
int sound_timers_and_dac(int raster)\r
{\r
  if(raster >= 0 && PsndOut && (PicoOpt&1) && *ym2612_dacen) {\r
    short dout = (short) *ym2612_dacout;\r
    int pos=dac_info[raster], len=pos&0xf;\r
    short *d;\r
    pos>>=4;\r
\r
    if(PicoOpt&8) { // only left channel for stereo (will be copied to right by ym2612 mixing code)\r
      d=PsndOut+pos*2;\r
      while(len--) { *d = dout; d += 2; }\r
    } else {\r
      d=PsndOut+pos;\r
      while(len--) *d++ = dout;\r
    }\r
  }\r
\r
  //dprintf("s: %03i", raster);\r
\r
  // Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)\r
  YM2612PicoTick(1);\r
\r
  return 0;\r
}\r
\r
\r
int sound_render(int offset, int length)\r
{\r
  int stereo = (PicoOpt & 8) >> 3;\r
  offset <<= stereo;\r
\r
  // PSG\r
  if(PicoOpt & 2)\r
    SN76496Update(PsndOut+offset, length, stereo);\r
\r
  // Add in the stereo FM buffer\r
  if(PicoOpt & 1) {\r
    YM2612UpdateOne(PsndOut+offset, length, stereo);\r
  } else {\r
    // YM2612 upmixes to stereo, so we have to do this manually here\r
    int i;\r
	short *s = PsndOut+offset;\r
	for (i = 0; i < length; i++) {\r
      *(s+1) = *s; s+=2;\r
    }\r
  }\r
\r
  return 0;\r
}\r
\r
\r
\r
#if defined(_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
#elif defined(_USE_DRZ80)\r
\r
static 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
\r
static unsigned char DrZ80_in(unsigned short p)\r
{\r
  return 0xff;\r
}\r
\r
static void DrZ80_out(unsigned short p,unsigned char d)\r
{\r
}\r
\r
static void DrZ80_irq_callback()\r
{\r
  drZ80.Z80_IRQ = 0; // lower irq when accepted\r
}\r
\r
#endif\r
\r
// z80 functionality wrappers\r
void z80_init()\r
{\r
#if defined(_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
\r
#elif defined(_USE_DRZ80)\r
\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  =z80_read16;\r
  drZ80.z80_write8  =z80_write;\r
  drZ80.z80_write16 =z80_write16;\r
  drZ80.z80_in      =DrZ80_in;\r
  drZ80.z80_out     =DrZ80_out;\r
  drZ80.z80_irq_callback=DrZ80_irq_callback;\r
#endif\r
}\r
\r
void z80_reset()\r
{\r
#if defined(_USE_MZ80)\r
  mz80reset();\r
#elif defined(_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.Z80PC = drZ80.z80_rebasePC(0);\r
  drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?\r
#endif\r
  Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled\r
}\r
\r
void z80_resetCycles()\r
{\r
#if defined(_USE_MZ80)\r
  mz80GetElapsedTicks(1);\r
#endif\r
}\r
\r
void z80_int()\r
{\r
#if defined(_USE_MZ80)\r
  mz80int(0);\r
#elif defined(_USE_DRZ80)\r
  drZ80.z80irqvector = 0xFF; // default IRQ vector RST opcode\r
  drZ80.Z80_IRQ = 1;\r
#endif\r
}\r
\r
// returns number of cycles actually executed\r
int z80_run(int cycles)\r
{\r
#if defined(_USE_MZ80)\r
  int ticks_pre = mz80GetElapsedTicks(0);\r
  mz80exec(cycles);\r
  return mz80GetElapsedTicks(0) - ticks_pre;\r
#elif defined(_USE_DRZ80)\r
  return cycles - DrZ80Run(&drZ80, cycles);\r
#else\r
  return cycles;\r
#endif\r
}\r
\r
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
#endif\r
}\r
\r
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
#endif\r
}\r
\r
void z80_exit()\r
{\r
#if defined(_USE_MZ80)\r
  mz80shutdown();\r
#endif\r
}\r
\r
#if defined(__DEBUG_PRINT) || defined(WIN32)\r
void z80_debug(char *dstr)\r
{\r
#if defined(_USE_DRZ80)\r
  sprintf(dstr, "%sZ80 state: PC: %04x SP: %04x\n", dstr, drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);\r
#endif\r
}\r
#endif\r