From 14977cfc3689eca64c6bcd6192238eed4aecd4c0 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@zeromus.org>
Date: Sun, 20 Feb 2011 02:49:37 +0000
Subject: [PATCH]

---
 .../Consoles/Nintendo/NES/NES.cs              | 163 ++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
new file mode 100644
index 0000000000..ece81bc4b2
--- /dev/null
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
@@ -0,0 +1,163 @@
+using System;
+using System.Globalization;
+using System.IO;
+using System.Collections.Generic;
+using BizHawk.Emulation.CPUs.M6502;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	public class NES : IEmulator
+	{
+		//hardware
+		MOS6502 cpu = new MOS6502();
+		byte[] rom;
+		byte[] ram;
+
+		public byte ReadPPUReg(int addr)
+		{
+			return 0xFF;
+		}
+
+		public byte ReadReg(int addr)
+		{
+			return 0xFF;
+		}
+
+		public byte ReadMemory(ushort addr)
+		{
+			if (addr < 0x0800) return ram[addr];
+			if (addr < 0x1000) return ram[addr - 0x0800];
+			if (addr < 0x1800) return ram[addr - 0x1000];
+			if (addr < 0x2000) return ram[addr - 0x1800];
+			if (addr < 0x4000) return ReadPPUReg(addr & 7);
+			if (addr < 0x4020) return ReadReg(addr - 0x4020);
+			if (addr < 0x6000) return 0xFF; //exp rom
+			if (addr < 0x8000) return 0xFF; //sram
+			return 0xFF; //got tired of doing this
+		}
+
+		public void WriteMemory(ushort addr, byte value)
+		{
+			if (addr < 0x0800) ram[addr] = value;
+			if (addr < 0x1000) ram[addr - 0x0800] = value;
+			if (addr < 0x1800) ram[addr - 0x1000] = value;
+			if (addr < 0x2000) ram[addr - 0x1800] = value;
+		}
+
+
+		public NES()
+		{
+			cpu.ReadMemory = ReadMemory;
+			cpu.WriteMemory = WriteMemory;
+		}
+
+		class MyVideoProvider : IVideoProvider
+		{
+			NES emu;
+			public MyVideoProvider(NES emu)
+			{
+				this.emu = emu;
+			}
+
+			public int[] GetVideoBuffer()
+			{
+				int testval = 0;
+				if (emu.Controller.IsPressed("DOWN")) testval = 0xFF;
+
+				int[] pixels = new int[256 * 256];
+				int i = 0;
+				for (int y = 0; y < 256; y++)
+					for (int x = 0; x < 256; x++)
+					{
+						pixels[i++] = testval;
+					}
+				return pixels;
+			}
+			public int BufferWidth { get { return 256; } }
+			public int BufferHeight { get { return 256; } }
+			public int BackgroundColor { get { return 0; } }
+		}
+		public IVideoProvider VideoProvider { get { return new MyVideoProvider(this); } }
+
+
+		public ISoundProvider SoundProvider { get { return new NullEmulator(); } }
+
+		public static readonly ControllerDefinition NESController =
+			new ControllerDefinition
+			{
+				Name = "NES Controls",
+				BoolButtons = { "A","B","SELECT","START","LEFT","UP","DOWN","RIGHT", "RESET" }
+			};
+
+		public ControllerDefinition ControllerDefinition { get { return NESController; } }
+
+		IController controller;
+		public IController Controller
+		{
+			get { return controller; }
+			set { controller = value; }
+		}
+
+		public void LoadGame(IGame game)
+		{
+			rom = game.GetRomData();
+			
+			//parse iNes and UNIF!
+			//setup banks and stuff! oh crap what a pain! lets start with non-mapper games and add mappers later.
+
+			HardReset();
+		}
+
+		public void FrameAdvance(bool render)
+		{
+			//TODO!
+			//cpu.Execute(10000);
+		}
+
+		public void HardReset()
+		{
+			cpu.Reset();
+			ram = new byte[0x800];
+			for (int i = 0; i < 0x800; i++)
+				ram[i] = 0xFF;
+		}
+
+		public int Frame
+		{
+			get { return 0; }
+		}
+		public bool DeterministicEmulation { get { return true; } set { } }
+
+		public byte[] SaveRam { get { return null; } }
+		public bool SaveRamModified
+		{
+			get { return false; }
+			set { }
+		}
+
+		public void SaveStateText(TextWriter writer)
+		{
+		}
+
+		public void LoadStateText(TextReader reader)
+		{
+		}
+
+		public void SaveStateBinary(BinaryWriter writer)
+		{
+		}
+
+		public void LoadStateBinary(BinaryReader reader)
+		{
+		}
+
+		public byte[] SaveStateBinary()
+		{
+			return new byte[0];
+		}
+
+		public string SystemId { get { return "NES"; } }
+		public IList<MemoryDomain> MemoryDomains { get { throw new NotImplementedException(); } }
+		public MemoryDomain MainMemory { get { throw new NotImplementedException(); } }
+	}
+}
\ No newline at end of file