//	File	: fwPad.c
//	Author	: John Wojcik ( QuietBloke )
//	Created	: September 2000
//	Desc	: 2D game framework pad manager. In addition to the standard function
//		to return what buttons are down these routines can return which
//		keys have just been pressed or released.
//	History	:
// Date     Author          Description
// -------- --------------- ----------------------------------------

#include <stdio.h>
#include <libps.h>
#include "fwPad.h"

volatile u_char *bb0, *bb1;

unsigned int	padDown[2];		// Indicates a button is down
unsigned int	padPressed[2];		// Indicates a button has just been pressed
unsigned int	padReleased[2];		// Indicates a button has just been released

void fwPadInit ()
{
	GetPadBuf (&bb0, &bb1 );		
}

void fwPadRead ( void )
{
	unsigned int	currentstate;
	unsigned int	tempChanged;
	unsigned int	tempPressed;
	unsigned int	tempReleased;
	int		currentPad;

	for ( currentPad = 0; currentPad < 2; currentPad++ )
	{
		if ( currentPad == 0 )
			currentstate = ~(*(bb0+3) | *(bb0+2) << 8);
		else
			currentstate = ~(*(bb1+3) | *(bb1+2) << 8);

		// Mark each bit which has changed state 
		// Exclusive OR the old and new bits
		tempChanged = ( currentstate ^ padDown[currentPad] );

		// All bits which have changed and are currently pressed must have just been pressed
		tempPressed = ( tempChanged & currentstate );

		// All bits which have changed but which have not been just pressed must have been just released
		tempReleased = ( tempPressed ^ tempChanged);

		// Store all our details away
		padDown[currentPad] = currentstate;
		padPressed[currentPad] = tempPressed;
		padReleased[currentPad] = tempReleased;
	}
}

unsigned int fwPadGetDown ( int pad )
{
	return padDown[pad];
}

unsigned int fwPadGetPressed ( int pad )
{
	return padPressed[pad];
}

unsigned int fwPadGetReleased ( int pad )
{
	return padReleased[pad];
}