From 1cb756cbf2611693ec21eec9fd98e4367bb7d918 Mon Sep 17 00:00:00 2001
From: "madmaxoft@gmail.com"
 <madmaxoft@gmail.com@0a769ca7-a7f5-676a-18bf-c427514a06d6>
Date: Wed, 22 Feb 2012 17:04:04 +0000
Subject: [PATCH] Noise function optimization (chunk generation now about 1.5x
 faster :)

git-svn-id: http://mc-server.googlecode.com/svn/trunk@317 0a769ca7-a7f5-676a-18bf-c427514a06d6
---
 source/cNoise.cpp | 21 ++++++++++++++-------
 source/cNoise.h   | 20 ++++++++++++++++++--
 source/cNoise.inc |  2 +-
 3 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/source/cNoise.cpp b/source/cNoise.cpp
index 4221d9218..653b9e95c 100644
--- a/source/cNoise.cpp
+++ b/source/cNoise.cpp
@@ -129,18 +129,21 @@ float cNoise::CosineNoise2D( float a_X, float a_Y ) const
 	return CosineInterpolate( interp1, interp2, FracY );
 }
 
+
+
+
+
 float cNoise::CubicNoise2D( float a_X, float a_Y ) const
 {
 	const int	BaseX = FAST_FLOOR( a_X );
 	const int	BaseY = FAST_FLOOR( a_Y );
 	
-	const float points[4][4] = { 
-		
-		IntNoise2D( BaseX-1, BaseY-1 ), IntNoise2D( BaseX, BaseY-1 ),	IntNoise2D( BaseX+1, BaseY-1 ), IntNoise2D( BaseX+2, BaseY-1 ),
-		IntNoise2D( BaseX-1, BaseY ),	IntNoise2D( BaseX, BaseY ),		IntNoise2D( BaseX+1, BaseY ),	IntNoise2D( BaseX+2, BaseY ),
-		IntNoise2D( BaseX-1, BaseY+1 ), IntNoise2D( BaseX, BaseY+1 ),	IntNoise2D( BaseX+1, BaseY+1 ), IntNoise2D( BaseX+2, BaseY+1 ),
-		IntNoise2D( BaseX-1, BaseY+2 ), IntNoise2D( BaseX, BaseY+2 ),	IntNoise2D( BaseX+1, BaseY+2 ), IntNoise2D( BaseX+2, BaseY+2 ),
-
+	const float points[4][4] =
+	{
+		IntNoise2D( BaseX-1, BaseY-1 ), IntNoise2D( BaseX, BaseY-1 ), IntNoise2D( BaseX+1, BaseY-1 ), IntNoise2D( BaseX+2, BaseY-1 ),
+		IntNoise2D( BaseX-1, BaseY ),   IntNoise2D( BaseX, BaseY ),   IntNoise2D( BaseX+1, BaseY ),   IntNoise2D( BaseX+2, BaseY ),
+		IntNoise2D( BaseX-1, BaseY+1 ), IntNoise2D( BaseX, BaseY+1 ), IntNoise2D( BaseX+1, BaseY+1 ), IntNoise2D( BaseX+2, BaseY+1 ),
+		IntNoise2D( BaseX-1, BaseY+2 ), IntNoise2D( BaseX, BaseY+2 ), IntNoise2D( BaseX+1, BaseY+2 ), IntNoise2D( BaseX+2, BaseY+2 ),
 	};
 
 	const float	FracX = (a_X) - BaseX;
@@ -154,6 +157,10 @@ float cNoise::CubicNoise2D( float a_X, float a_Y ) const
 	return CubicInterpolate( interp1, interp2, interp3, interp4, FracY );
 }
 
+
+
+
+
 #if NOISE_USE_SSE
 float cNoise::SSE_CubicNoise2D( float a_X, float a_Y ) const
 {
diff --git a/source/cNoise.h b/source/cNoise.h
index d4da677f3..a0283fc8d 100644
--- a/source/cNoise.h
+++ b/source/cNoise.h
@@ -6,15 +6,23 @@
 
 // Do not touch
 #if NOISE_USE_INLINE
-# define __NOISE_INLINE__ inline
+	#ifdef _MSC_VER
+		#define __NOISE_INLINE__ __forceinline
+	#else
+		#define __NOISE_INLINE__ inline
+	#endif  // _MSC_VER
 #else
-# define __NOISE_INLINE__
+	#define __NOISE_INLINE__
 #endif
 
 #if NOISE_USE_SSE
 # include <emmintrin.h>
 #endif
 
+
+
+
+
 class cNoise
 {
 public:
@@ -55,6 +63,14 @@ private:
 	unsigned int m_Seed;
 };
 
+
+
+
+
 #if NOISE_USE_INLINE
 # include "cNoise.inc"
 #endif
+
+
+
+
diff --git a/source/cNoise.inc b/source/cNoise.inc
index a63bb0c2f..fd52fef37 100644
--- a/source/cNoise.inc
+++ b/source/cNoise.inc
@@ -36,7 +36,7 @@ float cNoise::CubicInterpolate( float a_A, float a_B, float a_C, float a_D, floa
 	float R = a_C - a_A;
 	float S = a_B;
 
-	return P*(a_Pct*a_Pct*a_Pct) + Q*(a_Pct*a_Pct) + R*a_Pct + S;
+	return ((P * a_Pct + Q) * a_Pct + R) * a_Pct + S;
 }
 
 float cNoise::CosineInterpolate( float a_A, float a_B, float a_Pct ) const