#pragma once

/*-------------------------------------------------------------

 iwa_noise1234.h

 Identical to a public domain code "noise1234.h" by Stefan Gustavson.

 Just changed file name for handling of files.

-------------------------------------------------------------*/

/*-- The original code starts here --*/

// Noise1234

// Author: Stefan Gustavson (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.

/** \file

                \brief Declares the Noise1234 class for producing Perlin noise.

                \author Stefan Gustavson (stegu@itn.liu.se)

*/

/*

 * This is a clean, fast, modern and free Perlin noise class in C++.

 * Being a stand-alone class with no external dependencies, it is

 * highly reusable without source code modifications.

 *

 * Note:

 * Replacing the "float" type with "double" can actually make this run faster

 * on some platforms. A templatized version of Noise1234 could be useful.

 */

class Noise1234 {

public:

  Noise1234() {}

  ~Noise1234() {}

  /** 1D, 2D, 3D and 4D float Perlin noise, SL "noise()"

*/

  static float noise(float x);

  static float noise(float x, float y);

  static float noise(float x, float y, float z);

  static float noise(float x, float y, float z, float w);

  /** 1D, 2D, 3D and 4D float Perlin periodic noise, SL "pnoise()"

*/

  static float pnoise(float x, int px);

  static float pnoise(float x, float y, int px, int py);

  static float pnoise(float x, float y, float z, int px, int py, int pz);

  static float pnoise(float x, float y, float z, float w, int px, int py,

                      int pz, int pw);

private:

  static unsigned char perm[];

  static float grad(int hash, float x);

  static float grad(int hash, float x, float y);

  static float grad(int hash, float x, float y, float z);

  static float grad(int hash, float x, float y, float z, float t);

};