axmol/extensions/Particle3D/PU/CCPUNoise.h

/****************************************************************************
 Copyright (C) 2013 Henry van Merode. All rights reserved.
 Copyright (c) 2015-2016 Chukong Technologies Inc.
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 https://adxeproject.github.io/

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#ifndef __CC_PU_PARTICLE_3D_NOISE_H__
#define __CC_PU_PARTICLE_3D_NOISE_H__

#include "base/CCRef.h"
#include "math/CCMath.h"

NS_CC_BEGIN

class PUNoise3D
{
public:
    /* Constructor / Destructor */
    PUNoise3D();
    virtual ~PUNoise3D();

    /* Inititialises the noise function */
    void initialise(unsigned short octaves, double frequency = 1.0, double amplitude = 1.0, double persistence = 1.0);

    /* Returns a noise value between [0, 1]
    @remarks
        The noise is calculated in realtime
    */
    double noise(double x, double y, double z);

    /* Returns a noise value between [0, 1]
    @remarks
        The noise is calculated in realtime
    */
    double noise(const Vec3& position);

    ///* Creates an image file to test the noise */
    // void noise2img(unsigned short dimension = 255);

protected:
    /* Returns a noise value between [0, 1]
@remarks
    The noise is calculated in realtime
*/
    double genNoise(double x, double y, double z);

    double fade(double t);
    double lerp(double t, double a, double b);
    double grad(int hash, double x, double y, double z);

protected:
    int _p[512];
    unsigned short _octaves;
    double _frequency;
    double _amplitude;
    double _persistence;
};

NS_CC_END

#endif