From aa6e1872df8fd1e84ea7568af0b6da72a38f1290 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@zeromus.org>
Date: Sun, 13 Mar 2011 19:35:50 +0000
Subject: [PATCH] [NES] setup a tiny bit of infrastructure for peeking the ppu
 instead of reading it, but really it isnt necessary until some of the more
 sophisticated mappers are made

---
 BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs | 2 +-
 BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
index 788de4efa5..c92c7b1c4b 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/NES.cs
@@ -176,7 +176,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
             var SystemBus = new MemoryDomain("System Bus", 0x10000, Endian.Little,
                 addr => ReadMemory((ushort)addr), (addr, value) => WriteMemory((ushort)addr, value));
             var PPUBus = new MemoryDomain("PPU Bus", 0x4000, Endian.Little,
-                addr => ppu.ppubus_read(addr), (addr, value) => ppu.ppubus_write(addr, value));
+                addr => ppu.ppubus_peek(addr), (addr, value) => ppu.ppubus_write(addr, value));
 			var dCIRAM = new MemoryDomain("CIRAM (nametables)", 0x800, Endian.Little,
 				addr => CIRAM[addr & 0x07FF], (addr, value) => CIRAM[addr & 0x07FF] = value);
             
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
index f094d62086..185c03850d 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
@@ -25,6 +25,12 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				return nes.board.ReadPPU(addr);
 			}
 
+			//debug tools peek into the ppu through this
+			public byte ppubus_peek(int addr)
+			{
+				return nes.board.PeekPPU(addr);
+			}
+
 			enum PPUPHASE {
 				VBL, BG, OBJ
 			};