31 lines
1.1 KiB
C
31 lines
1.1 KiB
C
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/************************************************************************
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* *
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* Copyright (C) 2002 3Dlabs Inc. Ltd. *
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* *
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***********************************************************************/
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#ifndef __ogl2_demo_h__
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#define __ogl2_demo_h__
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extern void SetNoiseFrequency(int frequency);
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extern double noise1(double arg);
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extern double noise2(double vec[2]);
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extern double noise3(double vec[3]);
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extern void normalize2(double vec[2]);
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extern void normalize3(double vec[3]);
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/*
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In what follows "alpha" is the weight when the sum is formed.
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Typically it is 2, As this approaches 1 the function is noisier.
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"beta" is the harmonic scaling/spacing, typically 2.
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*/
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extern double PerlinNoise1D(double x,double alpha, double beta, int n);
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extern double PerlinNoise2D(double x,double y,double alpha, double beta, int n);
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extern double PerlinNoise3D(double x,double y,double z,double alpha, double beta, int n);
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#endif // __ogl2_demo_h__
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