/* Mednafen - Multi-system 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        <string.h>
#include	<stdlib.h>
#include	"share.h"


static char side;
static uint32 pprsb[2];
static uint32 pprdata[2];

static uint8 ReadPP(int w)
{
                uint8 ret=0;
                ret|=((pprdata[w]>>pprsb[w])&1)<<3;
                ret|=((pprdata[w]>>(pprsb[w]+8))&1)<<4;
		if(pprsb[w]>=4) 
		{
		 ret|=0x10;
		 if(pprsb[w]>=8) 
		  ret|=0x08;
		}
		if(!fceuindbg)
                 pprsb[w]++;
                return ret;
}

static void StrobePP(int w)
{
		pprsb[w]=0;
}

void UpdatePP(int w, void *data, int arg)
{
 static const char shifttableA[12]={8,9,0,1,11,7,4,2,10,6,5,3};
 static const char shifttableB[12]={1,0,9,8,2,4,7,11,3,5,6,10};
 int x;

 pprdata[w]=0;

 if(side=='A')
  for(x=0;x<12;x++)
   pprdata[w]|=(((*(uint32 *)data)>>x)&1)<<shifttableA[x];
 else
  for(x=0;x<12;x++)
   pprdata[w]|=(((*(uint32 *)data)>>x)&1)<<shifttableB[x];
}

static int StateAction(int w, StateMem *sm, int load, int data_only)
{
 SFORMAT StateRegs[] =
 {
  SFVAR(pprsb[w]),
  SFVAR(pprdata[w]),
  SFEND
 };
 int ret = MDFNSS_StateAction(sm, load, data_only, StateRegs, w ? "INP1" : "INP0");
 if(load)
 {

 }
 return(ret);
}

static INPUTC PwrPadCtrl={ReadPP,0,StrobePP,UpdatePP,0,0, StateAction, 1, sizeof(uint32) };

static INPUTC *MDFN_InitPowerpad(int w)
{
 pprsb[w]=pprdata[w]=0;
 return(&PwrPadCtrl);
}

INPUTC *MDFN_InitPowerpadA(int w)
{
 side='A';
 return(MDFN_InitPowerpad(w));
}

INPUTC *MDFN_InitPowerpadB(int w)
{
 side='B';
 return(MDFN_InitPowerpad(w));
}
