Mapper 220 support

Core/Core.vcxproj

@@ -466,6 +466,7 @@
     <ClInclude Include="Mapper214.h" />
     <ClInclude Include="Mapper216.h" />
     <ClInclude Include="Mapper218.h" />
+    <ClInclude Include="Mapper220.h" />
     <ClInclude Include="Mapper221.h" />
     <ClInclude Include="Mapper222.h" />
     <ClInclude Include="Mapper225.h" />

Core/Core.vcxproj.filters

@@ -955,6 +955,9 @@
     <ClInclude Include="MMC3_Coolboy.h">
       <Filter>Nes\Mappers\MMC</Filter>
     </ClInclude>
+    <ClInclude Include="Mapper220.h">
+      <Filter>Nes\Mappers\Unnamed</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">

Core/Mapper220.h

@@ -0,0 +1,59 @@
+#pragma once
+#include "BaseMapper.h"
+
+//Only seems to be for Gyruss (mapper 220) - other games marked as mapper 220 are not supported by any emulator that I could find (or remapped to another board type).
+class Mapper220 : public BaseMapper
+{
+private:
+	uint8_t _regs[8];
+
+protected:
+	uint16_t GetPRGPageSize() { return 0x0800; }
+	uint16_t GetCHRPageSize() { return 0x2000; }
+
+	void InitMapper() override
+	{
+		memset(_regs, 0, sizeof(_regs));
+		SelectCHRPage(0, 0);
+		UpdateState();
+	}
+	
+	void StreamState(bool saving) override
+	{
+		BaseMapper::StreamState(saving);
+		
+		ArrayInfo<uint8_t> regs{ _regs, 8 };
+		Stream(regs);
+		
+		if(!saving) {
+			UpdateState();
+		}
+	}
+	
+	void UpdateState()
+	{
+		const int regOrder[8] = { 4, 5, 6, 7, 0, 1, 2, 3 };
+		for(int i = 0; i < 8; i++) {
+			SetCpuMemoryMapping(0x6000 + i * 0x800, 0x67FF + i * 0x800, _regs[regOrder[i]], PrgMemoryType::PrgRom);
+		}
+
+		SelectPrgPage4x(1, 0x34);
+		SelectPrgPage4x(2, 0x38);
+		SelectPrgPage4x(3, 0x3C);
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value) override
+	{
+		if(addr < 0xA000) {
+			SetMirroringType(value & 0x01 ? MirroringType::Vertical : MirroringType::Horizontal);
+		} else if(addr >= 0xB000 && addr < 0xF000) {
+			uint32_t regIndex = ((addr - 0xB000) >> 11) | ((addr >> 1) & 0x01);
+			if(addr & 0x01) {
+				_regs[regIndex] = (_regs[regIndex] & 0x0F) | (value << 4);
+			} else {
+				_regs[regIndex] = (_regs[regIndex] & 0xF0) | (value & 0x0F);
+			}
+			UpdateState();
+		}
+	}
+};

Core/MapperFactory.cpp

@@ -70,6 +70,7 @@
 #include "Mapper214.h"
 #include "Mapper216.h"
 #include "Mapper218.h"
+#include "Mapper220.h"
 #include "Mapper221.h"
 #include "Mapper222.h"
 #include "Mapper225.h"
@@ -205,7 +206,7 @@ Supported mappers:
 |---|===|162|163|164|165|166|167|168|===|170|171|172|173|===|175|
 |176|177|178|179|180|---|182|183|184|185|186|187|188|189|===|191|
 |192|193|194|195|196|197|   |199|200|201|202|203|204|205|206|207|
-|   |209|210|211|212|213|214|215|216|217|218|219|   |221|222|   |
+|   |209|210|211|212|213|214|215|216|217|218|219|220|221|222|   |
 |   |225|226|227|228|229|230|231|232|233|234|235|   |===|238|===|
 |240|241|242|243|244|245|246|===|===|249|250|===|252|253|254|255|
 -----------------------------------------------------------------
@@ -412,6 +413,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 217: return new MMC3_217();
 		case 218: return new Mapper218();
 		case 219: return new MMC3_219();
+		case 220: return new Mapper220();
 		case 221: return new Mapper221();
 		case 222: return new Mapper222();
 		case 225: return new Mapper225();