flewkey/cuberite-2a
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Noise function optimization (chunk generation now about 1.5x faster :)

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git-svn-id: http://mc-server.googlecode.com/svn/trunk@317 0a769ca7-a7f5-676a-18bf-c427514a06d6
This commit is contained in:
madmaxoft@gmail.com 2012-02-22 17:04:04 +00:00
parent a40ed8bd0d
commit 1cb756cbf2
3 changed files with 33 additions and 10 deletions
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21
source/cNoise.cpp
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@ -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
{

20
source/cNoise.h
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@ -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

2
source/cNoise.inc
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@ -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