/*
=============================================================================
  
  PAD.C
  Copyright (c) 1998 by Radouan Khechane.

  PlayStation controller pad input functions

=============================================================================

Usage:

 call PadInit(); as part of initialisation in main

 each frame (VSync loop),
 call PadRead(x); to return the status of controller pad x

 e.g. PADstatus = PadRead(x);

 then, test individual buttons by masking the pad status variable
 with the #defined constants in pad.h

 e.g. if (PADstatus & PADleft)   // Pad x left button is pressed
      {
          // do PADleft actions here
      }
*/

/*
====================
  I N C L U D E S
====================
*/

#include <libps.h>
#include "pad.h"

// low-level pad buffers
volatile u_char *bb0, *bb1;

/* 
====================
 F U N C T I O N S
====================
*/

/*
===============
 PadInit
call once only in program initialisation
===============
*/
void PadInit (void)
{
    GetPadBuf(&bb0, &bb1);
}

/*
===============
 PadRead
returns controller pad status, call once per VSync(0)
===============
*/
u_long PadRead (int pad)
{
    switch (pad)
    {
        case  1 :  // contoller pad 1
                   return ~( *(bb0 + 3) | *(bb0 + 2) << 8 );
        case  2 :  // controller pad 2
                   return ~( *(bb1 + 3) | *(bb1 + 2) << 8 );
        default :  // default is controller pad 1
                   return ~( *(bb0 + 3) | *(bb0 + 2) << 8 );
    }
}