/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 1998 BERO
 *  Copyright (C) 2002 Xodnizel
 *  Copyright (C) 2012 CaH4e3
 *
 * 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
 *
 * Oeka-kids board
 *
 * I might want to add some code to the mapper 96 PPU hook function
 * to not change CHR banks if the attribute table is being accessed,
 * if I make emulation a little more accurate in the future.
 *
 */

#include "mapinc.h"

static uint8 reg, ppulatch;

static SFORMAT StateRegs[] =
{
	{ &reg, 1, "REG" },
	{ &ppulatch, 1, "PPUL" },
	{ 0 }
};

static void Sync(void) {
	setmirror(MI_0);
	setprg32(0x8000, reg & 3);
	setchr4(0x0000, (reg & 4) | ppulatch);
	setchr4(0x1000, (reg & 4) | 3);
}

static DECLFW(M96Write) {
	reg = V;
	Sync();
}

static void FP_FASTAPASS(1) M96Hook(uint32 A) {
	if ((A & 0x3000) == 0x2000) {
		ppulatch = (A >> 8) & 3;
		Sync();
	}
}

static void M96Power(void) {
	reg = ppulatch = 0;
	Sync();
	SetReadHandler(0x8000, 0xffff, CartBR);
	SetWriteHandler(0x8000, 0xffff, M96Write);
}

static void StateRestore(int version) {
	Sync();
}

void Mapper96_Init(CartInfo *info) {
	info->Power = M96Power;
	PPU_hook = M96Hook;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}

