/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2003 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <string.h>
#include "share.h"

static uint8 OKValR, LastWR;
static uint32 OKData;
static uint32 OKX, OKY, OKB;

static uint8 FP_FASTAPASS(2) OK_Read(int w, uint8 ret) {
	if (w) {
		ret |= OKValR;
	}
	return(ret);
}

static void FP_FASTAPASS(1) OK_Write(uint8 V) {
	if (!(V & 0x1)) {
		int32 vx, vy;

		OKValR = OKData = 0;

		if (OKB) OKData |= 1;

		if (OKY >= 48)
			OKData |= 2;
		else if (OKB) OKData |= 3;

		vx = OKX * 240 / 256 + 8;
		vy = OKY * 256 / 240 - 12;
		if (vy < 0) vy = 0;
		if (vy > 255) vy = 255;
		if (vx < 0) vx = 0;
		if (vx > 255) vx = 255;
		OKData |= (vx << 10) | (vy << 2);
	} else {
		if ((~LastWR) & V & 0x02)
			OKData <<= 1;

		if (!(V & 0x2)) OKValR = 0x4;
		else {
			if (OKData & 0x40000) OKValR = 0;
			else OKValR = 0x8;
		}
	}
	LastWR = V;
}

static void FP_FASTAPASS(2) OK_Update(void *data, int arg) {
	OKX = ((uint32*)data)[0];
	OKY = ((uint32*)data)[1];
	OKB = ((uint32*)data)[2];
}

static void FP_FASTAPASS(2) DrawOeka(uint8 * buf, int arg) {
	if (arg && OKY < 44)
		FCEU_DrawCursor(buf, OKX, OKY);
}

static INPUTCFC OekaKids = { OK_Read, OK_Write, 0, OK_Update, 0, DrawOeka };

INPUTCFC *FCEU_InitOekaKids(void) {
	OKValR = 0;
	return(&OekaKids);
}