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n106.c

/* 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 FP_FASTAPASS(1) 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];

      //printf("Read: %02x, %02x\n",dopol&0x7f,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 FASTAPASS(2) DoNTARAMROM(int w, uint8 V)
{
        NTAPage[w]=V;
        //if(V>=0xE0)
      // setntamem(NTARAM+((V&1)<<10), 1, w);

      //printf("%d, %02x\n",w,V);
      //printf("%02x, %02x\n",((gorko>>(6+(w>>1)))&1),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 FASTAPASS(2) 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
       {
//      printf("Noha: %d, %02x\n",x,V);
          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:
               //printf("Yahaoo: %02x, %02x\n",dopol&0x7F,V);
               //puts("Hmm");
               if(dopol&0x40)
                   {
                    if(FSettings.SndRate)
                {
                 NamcoSoundHack();
                     GameExpSound.Fill=NamcoSound;
                 //GameExpSound.NeoFill=DoNamcoSound;
                 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);
                 //puts("IRQe");
                     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)
{
 int32 P,V;
 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;


      //FCEU_DispMessage("%d",MapperExRAM[0x7F]>>4);
      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;
        //uint64 ta;

        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, "WRAM");
      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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