Mapper 163 support (Only tested on FF7)

Core/Core.vcxproj

@@ -114,6 +114,7 @@
     <ClInclude Include="MMC2.h" />
     <ClInclude Include="Movie.h" />
     <ClInclude Include="MovieDataMessage.h" />
+    <ClInclude Include="Nanjing.h" />
     <ClInclude Include="NetMessage.h" />
     <ClInclude Include="SaveStateMessage.h" />
     <ClInclude Include="Snapshotable.h" />

Core/Core.vcxproj.filters

@@ -185,6 +185,9 @@
     <ClInclude Include="INotificationListener.h">
       <Filter>Header Files\Interfaces</Filter>
     </ClInclude>
+    <ClInclude Include="Nanjing.h">
+      <Filter>Header Files\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="CPU.cpp">

Core/MapperFactory.cpp

@@ -9,6 +9,7 @@
 #include "MMC1.h"
 #include "MMC2.h"
 #include "MMC3.h"
+#include "Nanjing.h"
 #include "NROM.h"
 #include "UNROM.h"
 #include "VRC2_4.h"
@@ -33,6 +34,7 @@ BaseMapper* MapperFactory::GetMapperFromID(uint8_t mapperID)
 		case 25: return new VRC2_4(VRCVariant::VRC4b);  //Conflicts: VRC2c, VRC4d
 		case 27: return new VRC2_4(VRCVariant::VRC4_27);  //Untested
 		case 71: return new UNROM(); //TODO: "It's largely a clone of UNROM, and Camerica games were initially emulated under iNES Mapper 002 before 071 was assigned."
+		case 163: return new Nanjing();
 		default: Console::DisplayMessage(L"Unsupported mapper, cannot load file.");
 	}
 

Core/Nanjing.h

@@ -0,0 +1,122 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+#include "PPU.h"
+
+class Nanjing : public BaseMapper
+{
+private:
+	uint8_t _registers[5];
+	bool _toggle;
+	bool _autoSwitchCHR;
+
+	void UpdateState()
+	{
+		uint8_t prgPage = _registers[0] & 0x0F | ((_registers[2] & 0x0F) << 4);
+
+		_autoSwitchCHR = (_registers[0] & 0x80) == 0x80;
+
+		SelectPRGPage(0, prgPage);
+	}
+
+protected:
+	virtual uint32_t GetPRGPageSize() { return 0x8000; }
+	virtual uint32_t GetCHRPageSize() {	return 0x1000; }
+
+	virtual void StreamState(bool saving)
+	{
+		BaseMapper::StreamState(saving);
+
+		StreamArray<uint8_t>(_registers, 5);
+		Stream<bool>(_toggle);
+		Stream<bool>(_autoSwitchCHR);
+	}
+
+	void InitMapper() 
+	{
+		memset(_registers, 0, sizeof(_registers));
+		_autoSwitchCHR = false;
+		
+		//"Initial value of this register is 1, initial value of "trigger" is 0."
+		_toggle = false;
+		_registers[4] = 1;
+
+		SelectPRGPage(0, 0);
+		SelectCHRPage(0, 0);
+		SelectCHRPage(1, 0);
+	}
+
+	uint16_t RegisterStartAddress() { return 0x5000; }
+	uint16_t RegisterEndAddress() { return 0x5FFF; }
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		if(addr >= 0x5000 && addr <= 0x5FFF) {
+			//"(Address is masked with 0x7300, except for 5101)"
+			if(addr == 0x5101) {
+				if(_registers[4] != 0 && value == 0) {
+					//"If the value of this register is changed from nonzero to zero, "trigger" is toggled (XORed with 1)"
+					_toggle = !_toggle;
+				}
+				_registers[4] = value;
+			} else {
+				switch(addr & 0x7300) {
+					case 0x5000:
+						_registers[0] = value;
+						if(!(_registers[0] & 0x80) && PPU::GetCurrentScanline() < 128) {
+							SelectCHRPage(0, 0);
+							SelectCHRPage(1, 1);
+						}
+						UpdateState();
+						break;
+					case 0x5100:
+						_registers[1] = value;
+						if(value == 6) {
+							SelectPRGPage(0, 3);
+						}
+						break;
+					case 0x5200:
+						_registers[2] = value;
+						UpdateState();
+						break;
+					case 0x5300: _registers[3] = value; break;
+				}
+			}
+		}
+	}
+
+public:
+	uint8_t ReadRAM(uint16_t addr)
+	{
+		if(addr >= 0x5000 && addr <= 0x5FFF) {
+			//"Reading: (Address is masked with 0x7700)"
+			switch(addr & 0x7700) {
+				case 0x5100:
+					//"5100 = Returns value of 5300"
+					return _registers[3];
+
+				case 0x5500:
+					//"5500 = If "trigger" is 1, returns value of 5300, otherwise returns 0 "
+					if(_toggle) {
+						return _registers[3];
+					}
+					break;
+			}
+			return 0;
+		} else {
+			return BaseMapper::ReadRAM(addr);
+		}
+	}
+
+	virtual void NotifyVRAMAddressChange(uint16_t addr)
+	{
+		if(_autoSwitchCHR) {
+			if(PPU::GetCurrentScanline() == 239) {
+				SelectCHRPage(0, 0);
+				SelectCHRPage(1, 0);
+			} else if(PPU::GetCurrentScanline() == 127) {
+				SelectCHRPage(0, 1);
+				SelectCHRPage(1, 1);
+			}
+		}
+	}
+};