From c5850f7946426b6d98d980c9a14c2b5ce54d3d31 Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Tue, 8 Nov 2016 17:18:36 -0500
Subject: [PATCH] UNIF AX5705 board support

---
 Core/Ax5705.h             | 65 +++++++++++++++++++++++++++++++++++++++
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 ++
 Core/MapperFactory.cpp    |  3 ++
 Core/MapperFactory.h      |  1 +
 Core/UnifLoader.h         |  2 +-
 6 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 Core/Ax5705.h

diff --git a/Core/Ax5705.h b/Core/Ax5705.h
new file mode 100644
index 00000000..5d52e3db
--- /dev/null
+++ b/Core/Ax5705.h
@@ -0,0 +1,65 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+
+class Ax5705 : public BaseMapper
+{
+private:
+	uint8_t _chrReg[8];
+
+protected:
+	uint16_t GetPRGPageSize() { return 0x2000; }
+	uint16_t GetCHRPageSize() { return 0x400; }
+
+	void InitMapper() override
+	{
+		memset(_chrReg, 0, sizeof(_chrReg));
+
+		SelectPRGPage(2, -2);
+		SelectPRGPage(3, -1);
+
+		for(int i = 0; i < 8; i++) {
+			SelectCHRPage(i, _chrReg[i]);
+		}
+	}
+
+	void StreamState(bool saving) override
+	{
+		BaseMapper::StreamState(saving);
+		ArrayInfo<uint8_t> chrReg{ _chrReg, 8 };
+		Stream(chrReg);
+	}
+
+	void UpdateChrReg(int index, uint8_t value, bool low)
+	{
+		if(low) {
+			_chrReg[index] = (_chrReg[index] & 0xF0) | (value & 0x0F);
+		} else {
+			_chrReg[index] = (_chrReg[index] & 0x0F) | ((((value & 0x04) >> 1) | ((value & 0x02) << 1) | (value & 0x09)) << 4);
+		}
+		SelectCHRPage(index, _chrReg[index]);
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value) override
+	{
+		if(addr >= 0xA008) {
+			bool low = (addr & 0x01) == 0x00;
+			switch(addr & 0xF00E) {
+				case 0xA008: UpdateChrReg(0, value, low); break;
+				case 0xA00A: UpdateChrReg(1, value, low); break;
+				case 0xC000: UpdateChrReg(2, value, low); break;
+				case 0xC002: UpdateChrReg(3, value, low); break;
+				case 0xC008: UpdateChrReg(4, value, low); break;
+				case 0xC00A: UpdateChrReg(5, value, low); break;
+				case 0xE000: UpdateChrReg(6, value, low); break;
+				case 0xE002: UpdateChrReg(7, value, low); break;
+			}
+		} else {
+			switch(addr & 0xF00F) {
+				case 0x8000: SelectPRGPage(0, ((value & 0x02) << 2) | ((value & 0x08) >> 2) | (value & 0x05)); break; // EPROM dump have mixed PRG and CHR banks, data lines to mapper seems to be mixed
+				case 0x8008: SetMirroringType(value & 0x01 ? MirroringType::Horizontal : MirroringType::Vertical); break;
+				case 0xA000: SelectPRGPage(1, ((value & 0x02) << 2) | ((value & 0x08) >> 2) | (value & 0x05)); break;
+			}
+		}
+	}
+};
\ No newline at end of file
diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 994ae6a2..c182ac9d 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -405,6 +405,7 @@
     <ClInclude Include="ArkanoidController.h" />
     <ClInclude Include="AutoRomTest.h" />
     <ClInclude Include="AutoSaveManager.h" />
+    <ClInclude Include="Ax5705.h" />
     <ClInclude Include="Bandai74161_7432.h" />
     <ClInclude Include="BandaiFcg.h" />
     <ClInclude Include="BandaiKaraoke.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index 66a06304..80d41a9a 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -1006,6 +1006,9 @@
     <ClInclude Include="Bmc70in1.h">
       <Filter>Nes\Mappers\Unif</Filter>
     </ClInclude>
+    <ClInclude Include="Ax5705.h">
+      <Filter>Nes\Mappers\Unif</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index cdf5874a..4c328f16 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -5,6 +5,7 @@
 #include "A65AS.h"
 #include "Action53.h"
 #include "ActionEnterprises.h"
+#include "Ax5705.h"
 #include "AXROM.h"
 #include "Bandai74161_7432.h"
 #include "BandaiFcg.h"
@@ -233,6 +234,7 @@ const uint16_t MapperFactory::FdsMapperID;
 const uint16_t MapperFactory::NsfMapperID;
 const uint16_t MapperFactory::UnknownBoard;
 const uint16_t MapperFactory::UnifA65AS;
+const uint16_t MapperFactory::UnifAx5705;
 const uint16_t MapperFactory::UnifBmc70in1;
 const uint16_t MapperFactory::UnifBmc70in1B;
 const uint16_t MapperFactory::UnifBmc190in1;
@@ -478,6 +480,7 @@ BaseMapper* MapperFactory::GetMapperFromID(RomData &romData)
 		case 255: return new Bmc255();
 
 		case MapperFactory::UnifA65AS: return new A65AS();
+		case MapperFactory::UnifAx5705: return new Ax5705();
 		case MapperFactory::UnifBmc70in1: return new Bmc70in1();
 		case MapperFactory::UnifBmc70in1B: return new Bmc70in1();
 		case MapperFactory::UnifBmc190in1: return new Bmc190in1();
diff --git a/Core/MapperFactory.h b/Core/MapperFactory.h
index 0eb96acd..59cbab93 100644
--- a/Core/MapperFactory.h
+++ b/Core/MapperFactory.h
@@ -30,6 +30,7 @@ class MapperFactory
 		static const uint16_t UnifGhostbusters63in1 = 65517;
 		static const uint16_t UnifBmc70in1 = 65516;
 		static const uint16_t UnifBmc70in1B = 65515;
+		static const uint16_t UnifAx5705 = 65514;
 
 		static shared_ptr<BaseMapper> InitializeFromFile(string romFilename, stringstream *filestream, string ipsFilename, int32_t archiveFileIndex);
 };
diff --git a/Core/UnifLoader.h b/Core/UnifLoader.h
index 3b3f8dc7..28410851 100644
--- a/Core/UnifLoader.h
+++ b/Core/UnifLoader.h
@@ -29,7 +29,7 @@ private:
 		{ "A65AS", MapperFactory::UnifA65AS },
 		{ "AC08", MapperFactory::UnknownBoard },
 		{ "ANROM", 7 },
-		{ "AX5705", MapperFactory::UnknownBoard },
+		{ "AX5705", MapperFactory::UnifAx5705 },
 		{ "BB", MapperFactory::UnknownBoard },
 		{ "BS-5", MapperFactory::UnifBs5 },
 		{ "CC-21", MapperFactory::UnknownBoard },