From ebdb244714370872190878ccfcf483f191b63100 Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Wed, 28 Jun 2017 10:24:19 -0500
Subject: [PATCH] NESHawk - a small speedup (a few fps) - don't call
 Board.ClockPPU unless it is implemented

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

diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.BoardSystem.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.BoardSystem.cs
index ce5c62bc3f..d4486394b3 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.BoardSystem.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/NES.BoardSystem.cs
@@ -404,6 +404,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			}
 			Board.Dispose();
 			Board = newboard;
+			ppu.HasClockPPU = Board.GetType().GetMethod(nameof(INESBoard.ClockPPU)).DeclaringType != typeof(NESBoardBase);
 		}
 
 
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/PPU.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/PPU.cs
index ebf93f8361..1e749f7c1c 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/PPU.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/PPU.cs
@@ -8,6 +8,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 	{
 		public int cpu_step, cpu_stepcounter;
 
+		public bool HasClockPPU = false;
+
 		// this only handles region differences within the PPU
 		int preNMIlines;
 		int postNMIlines;
@@ -333,7 +335,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 					Reg2002_vblank_clear_pending = false;
 				}
 
-				nes.Board.ClockPPU();
+				if (HasClockPPU)
+				{
+					nes.Board.ClockPPU();
+				}
 			}
 		}
 	}