India/cocos2d-x/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.
 
 http://www.cocos2d-x.org
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
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 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
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 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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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(void);
    virtual ~PUNoise3D(void);

    /* 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