PerlinNoise.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2016 Mario Luzeiro <[email protected]>
 * Copyright (C) 2016-2021 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */
 
#include <vector>
 
// THIS CLASS IS A TRANSLATION TO C++11 FROM THE REFERENCE
// JAVA IMPLEMENTATION OF THE IMPROVED PERLIN FUNCTION (see http://mrl.nyu.edu/~perlin/noise/)
// THE ORIGINAL JAVA IMPLEMENTATION IS COPYRIGHT 2002 KEN PERLIN
 
// I ADDED AN EXTRA METHOD THAT GENERATES A NEW PERMUTATION VECTOR
// (THIS IS NOT PRESENT IN THE ORIGINAL IMPLEMENTATION)
 
#ifndef PERLINNOISE_H
#define PERLINNOISE_H
 
class PerlinNoise
{
public:
    PerlinNoise();
 
    PerlinNoise( unsigned int seed );
 
    // Returns between 0.0f and 1.0f
    float noise( float x, float y, float z ) const;
    float noise( float x, float y ) const;
 
private:
    float fade( float t ) const;
    float lerp( float t, float a, float b ) const;
    float grad( int hash, float x, float y, float z ) const;
    float grad( int hash, float x, float y ) const;
 
    // The permutation vector
    std::vector<int> p;
};
 
#endif