/ray/src/lib/numerics/noise/perlin.h

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/*
 * lib/numerics/perlin.h
 * 
 * Perlins famous noise function. 
 * 
 * Copyright (c) 2004 by Klaus Sausen (nicolasius $ users.sourceforge.net)
 *                   and Wolfgang Wieser ] wwieser (a) gmx <*> de [. 
 * 
 * This file may be distributed and/or modified under the terms of the 
 * GNU General Public License version 2 as published by the Free Software 
 * Foundation. (See COPYING.GPL for details.)
 * 
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 * 
 */

#ifndef _LIB_NUMERICS_NOISE_PERLIN_H_
#define _LIB_NUMERICS_NOISE_PERLIN_H_ 1

#include <lib/numerics/noise/noise.h>


namespace NUM  // numerics
{

template<typename T>class NoiseGenerator_Perlin : public NoiseGenerator_Base<T>
{
    public:
        static const int B=0x100; 
        static const int NP=12;
        static const int N=1<<NP; 
        
    private:
        int p[B + B + 2];
        
        T g1[B + B + 2];
        T g2[B + B + 2][2];
        T g3[B + B + 2][3];
        
        void _init();
        
        NoiseGenerator_Perlin(const NoiseGenerator_Perlin &);
        void operator=(const NoiseGenerator_Perlin &);
    public:
        NoiseGenerator_Perlin(int seed=-1) : 
            NoiseGenerator_Base<T>()
            {  if(seed>=0)  srand(seed);  _init();  }
        ~NoiseGenerator_Perlin()
            {}
        
        T noise1(T) const;
        
        T noise2(const T *) const;
        
        T noise3(const T *) const;
};

}  // end of namespace NUM

#endif  /* _LIB_NUMERICS_NOISE_PERLIN_H_ */

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