From dd4f7d81317b3413e72fab8477caf2ae3ee429c3 Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sat, 23 Jan 2016 14:38:54 -0500
Subject: [PATCH] Mapper 112 support

---
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 +++
 Core/Mapper112.h          | 52 +++++++++++++++++++++++++++++++++++++++
 Core/MapperFactory.cpp    |  2 ++
 4 files changed, 58 insertions(+)
 create mode 100644 Core/Mapper112.h

diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index d90353ac..264aff8a 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -371,6 +371,7 @@
     <ClInclude Include="JalecoJf16.h" />
     <ClInclude Include="JalecoJf17_19.h" />
     <ClInclude Include="Mapper107.h" />
+    <ClInclude Include="Mapper112.h" />
     <ClInclude Include="Mapper200.h" />
     <ClInclude Include="Mapper201.h" />
     <ClInclude Include="Mapper202.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index 7fe21bab..b171ad67 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -443,6 +443,9 @@
     <ClInclude Include="SunSoft4.h">
       <Filter>Nes\Mappers</Filter>
     </ClInclude>
+    <ClInclude Include="Mapper112.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/Mapper112.h b/Core/Mapper112.h
new file mode 100644
index 00000000..bb9e7009
--- /dev/null
+++ b/Core/Mapper112.h
@@ -0,0 +1,52 @@
+#pragma once
+
+#include "stdafx.h"
+#include "MMC3.h"
+
+class Mapper112 : public MMC3
+{
+private:
+	uint8_t _currentReg;
+
+protected:
+	void InitMapper()
+	{
+		MMC3::InitMapper();
+		SetMirroringType(MirroringType::Vertical);
+	}
+
+	void UpdateMirroring()
+	{
+	}
+
+	void StreamState(bool saving)
+	{
+		MMC3::StreamState(saving);
+		Stream<uint8_t>(_currentReg);
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		switch(addr & 0xE001) {
+			case 0x8000:
+				//Adjust register numbers to match MMC3
+				_currentReg = value & 0x07;
+				if(_currentReg >= 2) {
+					_currentReg -= 2;
+				} else {
+					_currentReg += 6;
+				}
+				break;
+
+			case 0xA000:
+				_registers[_currentReg] = value;
+				break;
+
+			case 0xE000:
+				SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical);
+				break;
+		}
+	
+		UpdateState();
+	}
+};
\ No newline at end of file
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 0c81264e..4437eb0c 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -23,6 +23,7 @@
 #include "Mapper61.h"
 #include "Mapper62.h"
 #include "Mapper107.h"
+#include "Mapper112.h"
 #include "Mapper200.h"
 #include "Mapper201.h"
 #include "Mapper202.h"
@@ -139,6 +140,7 @@ BaseMapper* MapperFactory::GetMapperFromID(ROMLoader &romLoader)
 		case 97: return new IremTamS1();
 		case 101: return new JalecoJfxx(true);
 		case 107: return new Mapper107();
+		case 112: return new Mapper112();
 		case 113: return new Nina03_06(true);
 		case 115: return new MMC3_115();
 		case 119: return new MMC3_ChrRam(0x40, 0x7F, 8);