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n106.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "mapinc.h"

static uint16 IRQCount;
static uint8 IRQa;

static uint8 WRAM[8192];
static uint8 IRAM[128];

static DECLFR(AWRAM)
{
  return(WRAM[A-0x6000]);
}

static DECLFW(BWRAM)
{
  WRAM[A-0x6000]=V;
}

void Mapper19_ESI(void);

static uint8 NTAPage[4];

static uint8 dopol;
static uint8 gorfus;
static uint8 gorko;

static void NamcoSound(int Count);
static void NamcoSoundHack(void);
static void DoNamcoSound(int32 *Wave, int Count);
static void DoNamcoSoundHQ(void);
static void SyncHQ(int32 ts);

static int is210;        /* Lesser mapper. */

static uint8 PRG[3];
static uint8 CHR[8];

static SFORMAT N106_StateRegs[]={
  {PRG,3,"PRG"},
  {CHR,8,"CHR"},
  {NTAPage,4,"NTA"},
  {0}
};

static void SyncPRG(void)
{
  setprg8(0x8000,PRG[0]);
  setprg8(0xa000,PRG[1]);
  setprg8(0xc000,PRG[2]);
  setprg8(0xe000,0x3F);
}

static void NamcoIRQHook(int a)
{
  if(IRQa)
  {
    IRQCount+=a;
    if(IRQCount>=0x7FFF)
    {
      X6502_IRQBegin(FCEU_IQEXT);
      IRQa=0;
      IRQCount=0x7FFF; //7FFF;
    }
  }
}

static DECLFR(Namco_Read4800)
{
  uint8 ret=IRAM[dopol&0x7f];
  /* Maybe I should call NamcoSoundHack() here? */
  if(!fceuindbg)
    if(dopol&0x80)
      dopol=(dopol&0x80)|((dopol+1)&0x7f);
  return ret;
}

static DECLFR(Namco_Read5000)
{
  return(IRQCount);
}

static DECLFR(Namco_Read5800)
{
  return(IRQCount>>8);
}

static void DoNTARAMROM(int w, uint8 V)
{
  NTAPage[w]=V;
  if(V>=0xE0)
    setntamem(NTARAM+((V&1)<<10), 1, w);
  else
  {
    V&=CHRmask1[0];
    setntamem(CHRptr[0]+(V<<10), 0, w);
  }
}

static void FixNTAR(void)
{
  int x;
  for(x=0;x<4;x++)
     DoNTARAMROM(x,NTAPage[x]);
}

static void DoCHRRAMROM(int x, uint8 V)
{
  CHR[x]=V;
  if(!is210 && !((gorfus>>((x>>2)+6))&1) && (V>=0xE0))
  {
    // printf("BLAHAHA: %d, %02x\n",x,V);
    //setchr1r(0x10,x<<10,V&7);
  }
  else
    setchr1(x<<10,V);
}

static void FixCRR(void)
{
  int x;
  for(x=0;x<8;x++)
     DoCHRRAMROM(x,CHR[x]);
}

static DECLFW(Mapper19C0D8_write)
{
  DoNTARAMROM((A-0xC000)>>11,V);
}

static uint32 FreqCache[8];
static uint32 EnvCache[8];
static uint32 LengthCache[8];

static void FixCache(int a,int V)
{
  int w=(a>>3)&0x7;
  switch(a&0x07)
  {
    case 0x00:FreqCache[w]&=~0x000000FF;FreqCache[w]|=V;break;
    case 0x02:FreqCache[w]&=~0x0000FF00;FreqCache[w]|=V<<8;break;
    case 0x04:FreqCache[w]&=~0x00030000;FreqCache[w]|=(V&3)<<16;
              LengthCache[w]=(8-((V>>2)&7))<<2;
              break;
    case 0x07:EnvCache[w]=(double)(V&0xF)*576716;break;
  }
}

static DECLFW(Mapper19_write)
{
  A&=0xF800;
  if(A>=0x8000 && A<=0xb800)
    DoCHRRAMROM((A-0x8000)>>11,V);
  else switch(A)
  {
    case 0x4800:
         if(dopol&0x40)
         {
           if(FSettings.SndRate)
           {
             NamcoSoundHack();
             GameExpSound.Fill=NamcoSound;
             GameExpSound.HiFill=DoNamcoSoundHQ;
             GameExpSound.HiSync=SyncHQ;
           }
           FixCache(dopol,V);
         }
         IRAM[dopol&0x7f]=V;
         if(dopol&0x80)
           dopol=(dopol&0x80)|((dopol+1)&0x7f);
         break;
    case 0xf800:
         dopol=V;break;
    case 0x5000:
         IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break;
    case 0x5800:
         IRQCount&=0x00ff;IRQCount|=(V&0x7F)<<8;
         IRQa=V&0x80;
         X6502_IRQEnd(FCEU_IQEXT);
         break;
    case 0xE000:
         gorko=V&0xC0;
         PRG[0]=V&0x3F;
         SyncPRG();
         break;
    case 0xE800:
         gorfus=V&0xC0;
         FixCRR();
         PRG[1]=V&0x3F;
         SyncPRG();
         break;
    case 0xF000:
         PRG[2]=V&0x3F;
         SyncPRG();
         break;
  }
}

static int dwave=0;

static void NamcoSoundHack(void)
{
  int32 z,a;
  if(FSettings.soundq>=1)
  {
    DoNamcoSoundHQ();
    return;
  }
  z=((SOUNDTS<<16)/soundtsinc)>>4;
  a=z-dwave;
  if(a) DoNamcoSound(&Wave[dwave], a);
  dwave+=a;
}

static void NamcoSound(int Count)
{
  int32 z,a;
  z=((SOUNDTS<<16)/soundtsinc)>>4;
  a=z-dwave;
  if(a) DoNamcoSound(&Wave[dwave], a);
  dwave=0;
}

static uint32 PlayIndex[8];
static int32 vcount[8];
static int32 CVBC;

#define TOINDEX        (16+1)

// 16:15
static void SyncHQ(int32 ts)
{
  CVBC=ts;
}


/* Things to do:
        1        Read freq low
        2        Read freq mid
        3        Read freq high
        4        Read envelope
        ...?
*/

static INLINE uint32 FetchDuff(uint32 P, uint32 envelope)
{
  uint32 duff;
  duff=IRAM[((IRAM[0x46+(P<<3)]+(PlayIndex[P]>>TOINDEX))&0xFF)>>1];
  if((IRAM[0x46+(P<<3)]+(PlayIndex[P]>>TOINDEX))&1)
    duff>>=4;
  duff&=0xF;
  duff=(duff*envelope)>>16;
  return(duff);
}

static void DoNamcoSoundHQ(void)
{
  uint32 V; //mbg merge 7/17/06 made uint32
  int32 P; 
  int32 cyclesuck=(((IRAM[0x7F]>>4)&7)+1)*15;

  for(P=7;P>=(7-((IRAM[0x7F]>>4)&7));P--)
  {
    if((IRAM[0x44+(P<<3)]&0xE0) && (IRAM[0x47+(P<<3)]&0xF))
    {
      uint32 freq;
      int32 vco;
      uint32 duff2,lengo,envelope;

      vco=vcount[P];
      freq=FreqCache[P];
      envelope=EnvCache[P];
      lengo=LengthCache[P];

      duff2=FetchDuff(P,envelope);
      for(V=CVBC<<1;V<SOUNDTS<<1;V++)
      {
        WaveHi[V>>1]+=duff2;
        if(!vco)
        {
          PlayIndex[P]+=freq;
          while((PlayIndex[P]>>TOINDEX)>=lengo) PlayIndex[P]-=lengo<<TOINDEX;
          duff2=FetchDuff(P,envelope);
          vco=cyclesuck;
        }
        vco--;
      }
      vcount[P]=vco;
    }
  }
  CVBC=SOUNDTS;
}


static void DoNamcoSound(int32 *Wave, int Count)
{
  int P,V;
  for(P=7;P>=7-((IRAM[0x7F]>>4)&7);P--)
  {
    if((IRAM[0x44+(P<<3)]&0xE0) && (IRAM[0x47+(P<<3)]&0xF))
    {
      int32 inc;
      uint32 freq;
      int32 vco;
      uint32 duff,duff2,lengo,envelope;

      vco=vcount[P];
      freq=FreqCache[P];
      envelope=EnvCache[P];
      lengo=LengthCache[P];

      if(!freq) {/*printf("Ack");*/  continue;}

      {
        int c=((IRAM[0x7F]>>4)&7)+1;
        inc=(long double)(FSettings.SndRate<<15)/((long double)freq*21477272/((long double)0x400000*c*45));
      }

      duff=IRAM[(((IRAM[0x46+(P<<3)]+PlayIndex[P])&0xFF)>>1)];
      if((IRAM[0x46+(P<<3)]+PlayIndex[P])&1)
        duff>>=4;
      duff&=0xF;
      duff2=(duff*envelope)>>19;
      for(V=0;V<Count*16;V++)
      {
        if(vco>=inc)
        {
          PlayIndex[P]++;
          if(PlayIndex[P]>=lengo)
            PlayIndex[P]=0;
          vco-=inc;
          duff=IRAM[(((IRAM[0x46+(P<<3)]+PlayIndex[P])&0xFF)>>1)];
          if((IRAM[0x46+(P<<3)]+PlayIndex[P])&1)
            duff>>=4;
          duff&=0xF;
          duff2=(duff*envelope)>>19;
        }
        Wave[V>>4]+=duff2;
        vco+=0x8000;
      }
      vcount[P]=vco;
    }
  }
}

static void Mapper19_StateRestore(int version)
{
  int x;
  SyncPRG();
  FixNTAR();
  FixCRR();
  for(x=0x40;x<0x80;x++)
     FixCache(x,IRAM[x]);
}

static void M19SC(void)
{
  if(FSettings.SndRate)
    Mapper19_ESI();
}

void Mapper19_ESI(void)
{
  GameExpSound.RChange=M19SC;
  memset(vcount,0,sizeof(vcount));
  memset(PlayIndex,0,sizeof(PlayIndex));
  CVBC=0;
}

void NSFN106_Init(void)
{
  SetWriteHandler(0xf800,0xffff,Mapper19_write);
  SetWriteHandler(0x4800,0x4fff,Mapper19_write);
  SetReadHandler(0x4800,0x4fff,Namco_Read4800);
  Mapper19_ESI();
}

static int battery=0;

static void N106_Power(void)
{
  int x;
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x8000,0xffff,Mapper19_write);
  SetWriteHandler(0x4020,0x5fff,Mapper19_write);
  if(!is210)
  {
    SetWriteHandler(0xc000,0xdfff,Mapper19C0D8_write);
    SetReadHandler(0x4800,0x4fff,Namco_Read4800);
    SetReadHandler(0x5000,0x57ff,Namco_Read5000);
    SetReadHandler(0x5800,0x5fff,Namco_Read5800);
    NTAPage[0]=NTAPage[1]=NTAPage[2]=NTAPage[3]=0xFF;
    FixNTAR();
  }

  SetReadHandler(0x6000,0x7FFF,AWRAM);
  SetWriteHandler(0x6000,0x7FFF,BWRAM);
  FCEU_CheatAddRAM(8,0x6000,WRAM);

  gorfus=0xFF;
  SyncPRG();
  FixCRR();

  if(!battery)
  {
    FCEU_dwmemset(WRAM,0,8192);
    FCEU_dwmemset(IRAM,0,128);
  }
  for(x=0x40;x<0x80;x++)
     FixCache(x,IRAM[x]);
}

void Mapper19_Init(CartInfo *info)
{
  is210=0;
  battery=info->battery;
  info->Power=N106_Power;

  MapIRQHook=NamcoIRQHook;
  GameStateRestore=Mapper19_StateRestore;
  GameExpSound.RChange=M19SC;

  if(FSettings.SndRate)
    Mapper19_ESI();

  AddExState(WRAM, 8192, 0, "WRAM");
  AddExState(IRAM, 128, 0, "IRAM");
  AddExState(N106_StateRegs, ~0, 0, 0);

  if(info->battery)
  {
    info->SaveGame[0]=WRAM;
    info->SaveGameLen[0]=8192;
    info->SaveGame[1]=IRAM;
    info->SaveGameLen[1]=128;
  }
}

static void Mapper210_StateRestore(int version)
{
  SyncPRG();
  FixCRR();
}

void Mapper210_Init(CartInfo *info)
{
  is210=1;
  GameStateRestore=Mapper210_StateRestore;
  info->Power=N106_Power;
  AddExState(WRAM, 8192, 0, "WRAM");
}

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