// Noise.h

#ifndef Noiseh
#define Noiseh

#pragma once

// Antialias, or smooth noise by multiplying the result by (1-HermiteStep(t,0.2,0.6))
struct Noise {
// One Dimensional:
  static double NoiseFunction(DWORD x); // returns in the interval [-1,1]

  // MosaicNoise: Each coordinate gives a specific number.
  // UnsignedMosaicNoise(x/17,y/7,0); will create random rectangles 17 by 7 pixels in size
  static double         Mosaic(DWORD x, DWORD y, DWORD z);
  static double UnsignedMosaic(DWORD x, DWORD y, DWORD z);

// One Dimensional Perlin Noise:
  static double SmoothedNoise(DWORD x);
  static double InterpolatedNoise(double x);
  static double Get(double x, int Octaves, double Persistence); // Persistence [0-1]. 1=All octaves added equally.
  static double Turbulence(double x, int Octaves, double Persistence);

// Two Dimensional Perlin Noise:
  static double NoiseFunction(DWORD x, DWORD y); // returns in the interval [-1,1]
  static double SmoothedNoise(DWORD x, DWORD y);
  static double InterpolatedNoise(double x, double y);
  static double Get(double x, double y, int Octaves, double Persistence);
  static double Turbulence(double x, double y, int Octaves, double Persistence);

// Three Dimensional Perlin Noise:
  static double InterpolatedNoise(double x, double y, double z);
  static double Get(double x, double y, double z, int Octaves, double Persistence); // Returns interval [-1,1]
  static double Turbulence(double x, double y, double z, int Octaves, double Persistence);

private:
  static double Lerp(double t, double a, double b);
  static double Grad(int Hash, double x, double y, double z);
public:
  static double Stripes(double x, double y, double z, int Octaves, double Persistence);
  static double Marble (double x, double y, int Octaves, double Persistence);
};

#endif // ndef Noiseh