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freeze.c

/***************************************************************************
                          freeze.c  -  description
                             -------------------
    begin                : Wed May 15 2002
    copyright            : (C) 2002 by Pete Bernert
    email                : BlackDove@addcom.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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. See also the license.txt file for *
 *   additional informations.                                              *
 *                                                                         *
 ***************************************************************************/

//*************************************************************************//
// History of changes:
//
// 2003/03/20 - Pete
// - fix to prevent the new interpolations from crashing when loading a save state
//
// 2003/01/06 - Pete
// - small changes for version 1.3 adsr save state loading      
//
// 2002/05/15 - Pete
// - generic cleanup for the Peops release
//
//*************************************************************************//

#include "stdafx.h"

#define _IN_FREEZE

#include "externals.h"
#include "registers.h"
#include "spu.h"
#include "regs.h"

////////////////////////////////////////////////////////////////////////
// freeze structs
////////////////////////////////////////////////////////////////////////

typedef struct
{
 char          szSPUName[8];
 uint32_t ulFreezeVersion;
 uint32_t ulFreezeSize;
 unsigned char cSPUPort[0x200];
 unsigned char cSPURam[0x80000];
 xa_decode_t   xaS;     
} SPUFreeze_t;

typedef struct
{
 unsigned short  spuIrq;
 uint32_t   pSpuIrq;
 uint32_t   dummy0;
 uint32_t   dummy1;
 uint32_t   dummy2;
 uint32_t   dummy3;

 SPUCHAN  s_chan[MAXCHAN];   

} SPUOSSFreeze_t;

////////////////////////////////////////////////////////////////////////

void LoadStateV5(SPUFreeze_t * pF);                    // newest version
void LoadStateUnknown(SPUFreeze_t * pF);               // unknown format

////////////////////////////////////////////////////////////////////////
// SPUFREEZE: called by main emu on savestate load/save
////////////////////////////////////////////////////////////////////////

long CALLBACK SPUfreeze(uint32_t ulFreezeMode,SPUFreeze_t * pF)
{
 int i;SPUOSSFreeze_t * pFO;

 if(!pF) return 0;                                     // first check

 if(ulFreezeMode)                                      // info or save?
  {//--------------------------------------------------//
   if(ulFreezeMode==1)                                 
    memset(pF,0,sizeof(SPUFreeze_t)+sizeof(SPUOSSFreeze_t));

   strcpy(pF->szSPUName,"PBOSS");
   pF->ulFreezeVersion=5;
   pF->ulFreezeSize=sizeof(SPUFreeze_t)+sizeof(SPUOSSFreeze_t);

   if(ulFreezeMode==2) return 1;                       // info mode? ok, bye
                                                       // save mode:
   RemoveTimer();                                      // stop timer

   memcpy(pF->cSPURam,spuMem,0x80000);                 // copy common infos
   memcpy(pF->cSPUPort,regArea,0x200);

   if(xapGlobal && XAPlay!=XAFeed)                     // some xa
    {
     pF->xaS=*xapGlobal;     
    }
   else 
   memset(&pF->xaS,0,sizeof(xa_decode_t));             // or clean xa

   pFO=(SPUOSSFreeze_t *)(pF+1);                       // store special stuff

   pFO->spuIrq=spuIrq;
   if(pSpuIrq)  pFO->pSpuIrq  = (unsigned long)pSpuIrq-(unsigned long)spuMemC;

   for(i=0;i<MAXCHAN;i++)
    {
     memcpy((void *)&pFO->s_chan[i],(void *)&s_chan[i],sizeof(SPUCHAN));
     if(pFO->s_chan[i].pStart)
      pFO->s_chan[i].pStart-=(unsigned long)spuMemC;
     if(pFO->s_chan[i].pCurr)
      pFO->s_chan[i].pCurr-=(unsigned long)spuMemC;
     if(pFO->s_chan[i].pLoop)
      pFO->s_chan[i].pLoop-=(unsigned long)spuMemC;
    }

   SetupTimer();                                       // sound processing on again

   return 1;
   //--------------------------------------------------//
  }
                                                       
 if(ulFreezeMode!=0) return 0;                         // bad mode? bye

#ifdef _WINDOWS
 if(iDebugMode && IsWindow(hWDebug))                   // clean debug mute infos
  SendMessage(hWDebug,WM_MUTE,0,0);
 if(IsBadReadPtr(pF,sizeof(SPUFreeze_t)))              // check bad emu stuff
  return 0;
#endif

 RemoveTimer();                                        // we stop processing while doing the save!

 memcpy(spuMem,pF->cSPURam,0x80000);                   // get ram
 memcpy(regArea,pF->cSPUPort,0x200);

 if(pF->xaS.nsamples<=4032)                            // start xa again
  SPUplayADPCMchannel(&pF->xaS);

 xapGlobal=0;

 if(!strcmp(pF->szSPUName,"PBOSS") &&                  
    pF->ulFreezeVersion==5)
      LoadStateV5(pF);
 else LoadStateUnknown(pF);

 // repair some globals
 for(i=0;i<=62;i+=2)
  SPUwriteRegister(H_Reverb+i,regArea[(H_Reverb+i-0xc00)>>1]);
 SPUwriteRegister(H_SPUReverbAddr,regArea[(H_SPUReverbAddr-0xc00)>>1]);
 SPUwriteRegister(H_SPUrvolL,regArea[(H_SPUrvolL-0xc00)>>1]);
 SPUwriteRegister(H_SPUrvolR,regArea[(H_SPUrvolR-0xc00)>>1]);

 SPUwriteRegister(H_SPUctrl,(unsigned short)(regArea[(H_SPUctrl-0xc00)>>1]|0x4000));
 SPUwriteRegister(H_SPUstat,regArea[(H_SPUstat-0xc00)>>1]);
 SPUwriteRegister(H_CDLeft,regArea[(H_CDLeft-0xc00)>>1]);
 SPUwriteRegister(H_CDRight,regArea[(H_CDRight-0xc00)>>1]);

 // fix to prevent new interpolations from crashing
 for(i=0;i<MAXCHAN;i++) s_chan[i].SB[28]=0;

 SetupTimer();                                         // start sound processing again

 return 1;
}

////////////////////////////////////////////////////////////////////////

void LoadStateV5(SPUFreeze_t * pF)
{
 int i;SPUOSSFreeze_t * pFO;

 pFO=(SPUOSSFreeze_t *)(pF+1);

 spuIrq   = pFO->spuIrq;
 if(pFO->pSpuIrq)  pSpuIrq  = pFO->pSpuIrq+spuMemC;  else pSpuIrq=0;

 for(i=0;i<MAXCHAN;i++)
  {
   memcpy((void *)&s_chan[i],(void *)&pFO->s_chan[i],sizeof(SPUCHAN));

   s_chan[i].pStart+=(unsigned long)spuMemC;
   s_chan[i].pCurr+=(unsigned long)spuMemC;
   s_chan[i].pLoop+=(unsigned long)spuMemC;
   s_chan[i].iMute=0;
   s_chan[i].iIrqDone=0;
  }
}

////////////////////////////////////////////////////////////////////////

void LoadStateUnknown(SPUFreeze_t * pF)
{
 int i;

 for(i=0;i<MAXCHAN;i++)
  {
   s_chan[i].bOn=0;
   s_chan[i].bNew=0;
   s_chan[i].bStop=0;
   s_chan[i].ADSR.lVolume=0;
   s_chan[i].pLoop=spuMemC;
   s_chan[i].pStart=spuMemC;
   s_chan[i].pLoop=spuMemC;
   s_chan[i].iMute=0;
   s_chan[i].iIrqDone=0;
  }

 dwNewChannel=0;
 pSpuIrq=0;

 for(i=0;i<0xc0;i++)
  {
   SPUwriteRegister(0x1f801c00+i*2,regArea[i]);
  }
}

////////////////////////////////////////////////////////////////////////

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