//*	pad.c - Joypad controller interface routines

//* System library headers
#include <libps.h>

//* Application headers
#include "pad.h"
#include "screens.h"

//* Status buffer pointers for pads 1 and 2
static volatile u_char *bb0, *bb1;


//*------------------------------------------------------------------------------------------
//*	PadInit - Get pad buffers (initialize pointers to the 2 buffers)
//*-------------------------------------------------------------------------------------<???>
void PadInit (void)
{
	GetPadBuf(&bb0, &bb1);
}


//*------------------------------------------------------------------------------------------
//*	ReadPadStat - Read and return status of controller in port 1 only
//*-------------------------------------------------------------------------------------<???>
u_long ReadPadStat(void)
{
register int		ct, lx, ly;
register u_long		result;

	//* Test for no controller or an unsupported controller in port 1
	if (*bb0 || ((ct=*(bb0+1)>>4)!=CONTROLLER_ANALOG && ct!=CONTROLLER_DIGITAL)) {
		//* Turn sound off (in case loops are playing)
		SsSetMute(SS_MUTE_ON);

		//* Overlay controller error screen once
		ControlErrorScreen();

		//* Pause while no controller or an unsupported controller is detected in port 1
		while (*bb0 || ((ct=*(bb0+1)>>4)!=CONTROLLER_ANALOG && ct!=CONTROLLER_DIGITAL))
			VSync(0);

		//* Turn sound back on
		SsSetMute(SS_MUTE_OFF);
	}

	//* Get common controller button status from port 1 only
	//* Note: complement result (~) so 1=pressed & 0=released
	result = ~(*(bb0+3) | *(bb0+2)<<8);

	if (ct == CONTROLLER_ANALOG) {		//* Analog controller being used...
		lx = *(bb0+6);						//* Get left stick horizontal value
		ly = *(bb0+7);						//* Get left stick vertical value

		if (lx <= ANALOG_LOW_TRIGGER) {
			result |= PAD1_LEFT;				//* Simulate LEFT d-pad button press
		} else if (lx >= ANALOG_HIGH_TRIGGER) {
			result |= PAD1_RIGHT;				//* Simulate RIGHT d-pad button press
		}

		if (ly <= ANALOG_LOW_TRIGGER) {
			result |= PAD1_UP;					//* Simulate UP d-pad button press
		} else if (ly >= ANALOG_HIGH_TRIGGER) {
			result |= PAD1_DOWN;				//* Simulate DOWN d-pad button press
		}
	}

	return result;
}