// SimplexNoise1234
// Copyright © 2003-2011, Stefan Gustavson
//
// Contact: stegu@itn.liu.se
//
// This library is public domain software, released by the author
// into the public domain in February 2011. You may do anything
// you like with it. You may even remove all attributions,
// but of course I'd appreciate it if you kept my name somewhere.
//
// This library 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.

// Modified by the LOVE Development Team to use double precision.

/** \file
		\brief Declares the SimplexNoise1234 class for producing Perlin simplex noise.
		\author Stefan Gustavson (stegu@itn.liu.se)
*/

/*
 * This is a clean, fast, modern and free Perlin Simplex noise class in C++.
 * Being a stand-alone class with no external dependencies, it is
 * highly reusable without source code modifications.
 */

class SimplexNoise1234 {

  public:
    SimplexNoise1234() {}
    ~SimplexNoise1234() {}

/** 1D and 2D float Perlin noise
 */
    static double noise( double x );
    static double noise( double x, double y );
    static double noise( double x, double y, double z );
    static double noise( double x, double y, double z, double w);

  private:
    static unsigned char perm[];
    static double  grad( int hash, double x );
    static double  grad( int hash, double x, double y );
    static double  grad( int hash, double x, double y, double z );
    static double  grad( int hash, double x, double y, double z, double t );
};