From 4b037162b72acf866712e89730c24c31342473b8 Mon Sep 17 00:00:00 2001
From: Souryo <mesenemu@gmail.com>
Date: Sat, 23 Jan 2016 12:51:10 -0500
Subject: [PATCH] Mapper 67 (SunSoft 3) support

---
 Core/Core.vcxproj         |  1 +
 Core/Core.vcxproj.filters |  3 ++
 Core/MapperFactory.cpp    |  2 ++
 Core/SunSoft3.h           | 70 +++++++++++++++++++++++++++++++++++++++
 4 files changed, 76 insertions(+)
 create mode 100644 Core/SunSoft3.h

diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 96116349..0aec08bd 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -474,6 +474,7 @@
     <ClInclude Include="ROMLoader.h" />
     <ClInclude Include="stdafx.h" />
     <ClInclude Include="Sunsoft184.h" />
+    <ClInclude Include="SunSoft3.h" />
     <ClInclude Include="Sunsoft89.h" />
     <ClInclude Include="Sunsoft93.h" />
     <ClInclude Include="TaitoTc0190.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index aee6cfed..bc208c8f 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -434,6 +434,9 @@
     <ClInclude Include="Mapper62.h">
       <Filter>Nes\Mappers</Filter>
     </ClInclude>
+    <ClInclude Include="SunSoft3.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 904c3950..5fb3661e 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -60,6 +60,7 @@
 #include "Sachen_147.h"
 #include "Sachen_148.h"
 #include "Sachen_149.h"
+#include "Sunsoft3.h"
 #include "Sunsoft89.h"
 #include "Sunsoft93.h"
 #include "Sunsoft184.h"
@@ -113,6 +114,7 @@ BaseMapper* MapperFactory::GetMapperFromID(ROMLoader &romLoader)
 		case 61: return new Mapper61();
 		case 62: return new Mapper62();
 		case 66: return new GxRom();
+		case 67: return new SunSoft3();
 		case 70: return new Bandai74161_7432(false);
 		case 71: return new BF909x();
 		case 72: return new JalecoJf17_19(false);
diff --git a/Core/SunSoft3.h b/Core/SunSoft3.h
new file mode 100644
index 00000000..7ec0fb41
--- /dev/null
+++ b/Core/SunSoft3.h
@@ -0,0 +1,70 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+#include "CPU.h"
+
+class SunSoft3 : public BaseMapper
+{
+private:
+	bool _irqLatch = false;
+	bool _irqEnabled = false;
+	uint16_t _irqCounter = 0;
+
+protected:
+	virtual uint16_t GetPRGPageSize() { return 0x4000; }
+	virtual uint16_t GetCHRPageSize() { return 0x800; }
+
+	void InitMapper()
+	{
+		SelectPRGPage(1, -1);
+	}
+
+	virtual void StreamState(bool saving)
+	{
+		BaseMapper::StreamState(saving);
+		Stream<bool>(_irqLatch);
+		Stream<bool>(_irqEnabled);
+		Stream<uint16_t>(_irqCounter);
+	}
+
+	virtual void ProcessCpuClock()
+	{
+		if(_irqEnabled) {
+			_irqCounter--;
+			if(_irqCounter == 0xFFFF) {
+				_irqEnabled = false;
+				CPU::SetIRQSource(IRQSource::External);
+			}
+		}
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		switch(addr & 0xF800) {
+			case 0x8800: SelectCHRPage(0, value); break;
+			case 0x9800: SelectCHRPage(1, value); break;
+			case 0xA800: SelectCHRPage(2, value); break;
+			case 0xB800: SelectCHRPage(3, value); break;
+			case 0xC800: 
+				_irqCounter &= _irqLatch ? 0xFF00 : 0x00FF;
+				_irqCounter |= _irqLatch ? value : (value << 8);
+				_irqLatch = !_irqLatch;
+				break;
+			case 0xD800:
+				_irqEnabled = (value & 0x10) == 0x10;
+				_irqLatch = false;
+				CPU::ClearIRQSource(IRQSource::External);
+				break;
+			case 0xE800:
+				switch(value & 0x03) {
+					case 0: SetMirroringType(MirroringType::Vertical); break;
+					case 1: SetMirroringType(MirroringType::Horizontal); break;
+					case 2: SetMirroringType(MirroringType::ScreenAOnly); break;
+					case 3: SetMirroringType(MirroringType::ScreenBOnly); break;
+				}
+				break;
+			case 0xF800: SelectPRGPage(0, value); break;
+		}
+	}
+};
+#pragma once