From 84dc0cd3b49a596668cbd00f853e8ab57fb4ad5b Mon Sep 17 00:00:00 2001
From: saulfabreg Wii VC Project <saulfabregamboa@outlook.com>
Date: Tue, 28 Jun 2022 18:39:09 -0500
Subject: [PATCH] Add support for Mapper 126 (allows to play Power Joy 84-in-1)
 (Tanooki16) (#470)

* Add support for mapper 126 (on game Power Joy 84-in-1) (Tanooki16)

* forgot to uncomment tile for enable mapper 126 emulation
---
 source/fceultra/boards/126.cpp | 102 +++++++++++++++++++++++++++++++++
 source/fceultra/ines.cpp       |   2 +-
 source/fceultra/ines.h         |   1 +
 3 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 source/fceultra/boards/126.cpp

diff --git a/source/fceultra/boards/126.cpp b/source/fceultra/boards/126.cpp
new file mode 100644
index 0000000..813d7d6
--- /dev/null
+++ b/source/fceultra/boards/126.cpp
@@ -0,0 +1,102 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2019
+ *
+ * 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 "mapinc.h"
+#include "mmc3.h"
+
+static uint16 GetExChrExBank() {
+	uint16 bank = (uint16)EXPREGS[0];
+	return ((~bank << 0 & 0x080 & ((uint16)EXPREGS[2])) | (bank << 4 & 0x080 & bank) |
+			(bank << 3 & 0x100) | (bank << 5 & 0x200));
+}
+
+static void UpdateChrBank(void) {
+	uint16 bank = (uint16)EXPREGS[2] & 0x0F;
+	bank |= GetExChrExBank() >> 3;
+	setchr8(bank);
+}
+
+static void M126CW(uint32 A, uint8 V) {
+	if (!(EXPREGS[3] & 0x10)) {
+		uint16 bank = (uint16)V & (((uint16)EXPREGS[0] & 0x80) - 1);
+		bank |= GetExChrExBank();
+		setchr1(A, bank);
+	}
+}
+
+static void M126PW(uint32 A, uint8 V) {
+	uint16 bank = (uint16)V;
+	uint16 preg = (uint16)EXPREGS[0];
+	bank &= ((~preg >> 2) & 0x10) | 0x0F;
+	bank |= ((preg & (0x06 | (preg & 0x40) >> 6)) << 4) | ((preg & 0x10) << 3);
+	if (!(EXPREGS[3] & 0x03))
+		setprg8(A, bank);
+	else if ((A - 0x8000) == ((MMC3_cmd << 8) & 0x4000)) { /* TODO: Clean this */
+		if ((EXPREGS[3] & 0x3) == 0x3)
+			setprg32(0x8000, (bank >> 2));
+		else {
+			setprg16(0x8000, (bank >> 1));
+			setprg16(0xc000, (bank >> 1));
+		}
+	}
+}
+
+static DECLFW(M126Write) {
+	A &= 0x03;
+	if(A == 0x01 || A == 0x02 || ((A == 0x00 || A == 0x03) && !(EXPREGS[3] & 0x80))) {
+		if (EXPREGS[A] != V) {
+			EXPREGS[A] = V;
+			if (EXPREGS[3] & 0x10)
+				UpdateChrBank();
+			else
+				FixMMC3CHR(MMC3_cmd);
+			FixMMC3PRG(MMC3_cmd);
+		}
+	}
+}
+
+void M126StateRestore(int v) {
+	FixMMC3CHR(MMC3_cmd);
+	FixMMC3PRG(MMC3_cmd);
+
+	if (EXPREGS[3] & 0x10)
+		UpdateChrBank();
+}
+
+static void M126Reset(void) {
+	EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
+	MMC3RegReset();
+}
+
+static void M126Power(void) {
+	EXPREGS[0] = EXPREGS[1] = EXPREGS[2] = EXPREGS[3] = 0;
+	GenMMC3Power();
+	SetWriteHandler(0x6000, 0x7FFF, M126Write);
+}
+
+void Mapper126_Init(CartInfo *info) {
+	GenMMC3_Init(info, 2048, 1023, 0, 0);
+	cwrap = M126CW;
+	pwrap = M126PW;
+	info->Power = M126Power;
+	info->Reset = M126Reset;
+	GameStateRestore = M126StateRestore;
+	AddExState(EXPREGS, 4, 0, "EXPR");
+}
diff --git a/source/fceultra/ines.cpp b/source/fceultra/ines.cpp
index 640133f..1577aad 100644
--- a/source/fceultra/ines.cpp
+++ b/source/fceultra/ines.cpp
@@ -585,7 +585,7 @@ BMAPPINGLocal bmap[] = {
 	{"MMC3 PIRATE H2288",	123, UNLH2288_Init},
 //	{"",					124, Mapper124_Init},
 	{"FDS LH32",			125, LH32_Init},
-//	{"",					126, Mapper126_Init},
+	{"PowerJoy 84-in-1",	126, Mapper126_Init},
 //	{"",					127, Mapper127_Init},
 //	{"",					128, Mapper128_Init},
 //	{"",					129, Mapper129_Init},
diff --git a/source/fceultra/ines.h b/source/fceultra/ines.h
index c34239e..5ffcd2b 100644
--- a/source/fceultra/ines.h
+++ b/source/fceultra/ines.h
@@ -182,6 +182,7 @@ void Mapper119_Init(CartInfo *);
 void Mapper120_Init(CartInfo *);
 void Mapper121_Init(CartInfo *);
 void Mapper125_Init(CartInfo *);
+void Mapper126_Init(CartInfo *);
 void Mapper134_Init(CartInfo *);
 void Mapper140_Init(CartInfo *);
 void Mapper144_Init(CartInfo *);