/* 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"

#define vrctemp mapbyte1[0]
static uint8 indox;

#include "emu2413.h"

static int acount=0;

static OPLL *VRC7Sound=NULL;
static int dwave=0;

void DoVRC7Sound(void)
{
 int32 z,a;

 if(FSettings.soundq>=1) return;
 z=((SOUNDTS<<16)/soundtsinc)>>4;
 a=z-dwave;

 moocow(VRC7Sound, &Wave[dwave], a, 1);

 dwave+=a;
}

void UpdateOPLNEO(int32 *Wave, int Count)
{
 moocow(VRC7Sound, Wave, Count, 4);
}

void UpdateOPL(int Count)
{
 int32 z,a;

  z=((SOUNDTS<<16)/soundtsinc)>>4;
 a=z-dwave;

 if(VRC7Sound && a)
  moocow(VRC7Sound, &Wave[dwave], a, 1);

 dwave=0;
}

static INLINE void DaMirror(int V)
{
 int salpo[4]={MI_V,MI_H,MI_0,MI_1};
 setmirror(salpo[V&3]);
}

DECLFW(Mapper85_write)
{
        A|=(A&8)<<1;

        if(A>=0xa000 && A<=0xDFFF)
        {
        // printf("$%04x, $%04x\n",X.PC,A);
         A&=0xF010;
         {
          int x=((A>>4)&1)|((A-0xA000)>>11);
           mapbyte3[x]=V;
          setchr1(x<<10,V);
         }
        }
        else if(A==0x9030)
        {
         if(FSettings.SndRate)
         {
          OPLL_writeReg(VRC7Sound, indox, V);
          GameExpSound.Fill=UpdateOPL;
          GameExpSound.NeoFill=UpdateOPLNEO;
         }
        }
        else switch(A&0xF010)
        {
         case 0x8000:mapbyte2[0]=V;setprg8(0x8000,V);break;
         case 0x8010:mapbyte2[1]=V;setprg8(0xa000,V);break;
         case 0x9000:mapbyte2[2]=V;setprg8(0xc000,V);break;
         case 0x9010:indox=V;break;
         case 0xe000:mapbyte2[3]=V;DaMirror(V);break;
         case 0xE010:IRQLatch=V;
                     X6502_IRQEnd(FCEU_IQEXT);
                     break;
         case 0xF000:IRQa=V&2;
                     vrctemp=V&1;
                     if(V&2) {IRQCount=IRQLatch;}
                     acount=0;
                     X6502_IRQEnd(FCEU_IQEXT);
                     break;
         case 0xf010:if(vrctemp) IRQa=1;
                     else IRQa=0;
                     X6502_IRQEnd(FCEU_IQEXT);
                     break;
        }
}

static void KonamiIRQHook(int a)
{
  #define ACBOO 341
//  #define ACBOO ((227*2)+1)
  if(IRQa)
   {
    acount+=a*3;

    if(acount>=ACBOO)
    {
     doagainbub:acount-=ACBOO;
     IRQCount++;
     if(IRQCount&0x100) {X6502_IRQBegin(FCEU_IQEXT);IRQCount=IRQLatch;}
     if(acount>=ACBOO) goto doagainbub;
    }
 }
}

void Mapper85_StateRestore(int version)
{
 int x;

 if(version<7200)
 {
  for(x=0;x<8;x++)
   mapbyte3[x]=CHRBankList[x];
  for(x=0;x<3;x++)
   mapbyte2[x]=PRGBankList[x];
  mapbyte2[3]=(Mirroring<0x10)?Mirroring:Mirroring-0xE;
 }

 for(x=0;x<8;x++)
  setchr1(x*0x400,mapbyte3[x]);
 for(x=0;x<3;x++)
  setprg8(0x8000+x*8192,mapbyte2[x]);
 DaMirror(mapbyte2[3]);
 //LoadOPL();
}

static void M85SC(void)
{
 if(VRC7Sound)
  OPLL_set_rate(VRC7Sound, FSettings.SndRate);
}

static void M85SKill(void)
{
 if(VRC7Sound)
  OPLL_delete(VRC7Sound);
 VRC7Sound=NULL;
}

static void VRC7SI(void)
{
  GameExpSound.RChange=M85SC;
  GameExpSound.Kill=M85SKill;

  VRC7Sound=OPLL_new(3579545, FSettings.SndRate?FSettings.SndRate:44100);
  OPLL_reset(VRC7Sound);
  OPLL_reset(VRC7Sound);
}

void NSFVRC7_Init(void)
{
    SetWriteHandler(0x9010,0x901F,Mapper85_write);
    SetWriteHandler(0x9030,0x903F,Mapper85_write);
    VRC7SI();
}

void Mapper85_init(void)
{
  MapIRQHook=KonamiIRQHook;
  SetWriteHandler(0x8000,0xffff,Mapper85_write);
  GameStateRestore=Mapper85_StateRestore;
  if(!VROM_size)
   SetupCartCHRMapping(0, CHRRAM, 8192, 1);
  //AddExState(VRC7Instrument, 16, 0, "VC7I");
  //AddExState(VRC7Chan, sizeof(VRC7Chan), 0, "V7CH");
  VRC7SI();
}
