axmol/extensions/Particle3D/PU/CCPUNoise.cpp

/****************************************************************************
 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.

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#include "CCPUNoise.h"

NS_CC_BEGIN

static int permutation[] = {
    151, 160, 137, 91,  90,  15,  131, 13,  201, 95,  96,  53,  194, 233, 7,   225, 140, 36,  103, 30,  69,  142,
    8,   99,  37,  240, 21,  10,  23,  190, 6,   148, 247, 120, 234, 75,  0,   26,  197, 62,  94,  252, 219, 203,
    117, 35,  11,  32,  57,  177, 33,  88,  237, 149, 56,  87,  174, 20,  125, 136, 171, 168, 68,  175, 74,  165,
    71,  134, 139, 48,  27,  166, 77,  146, 158, 231, 83,  111, 229, 122, 60,  211, 133, 230, 220, 105, 92,  41,
    55,  46,  245, 40,  244, 102, 143, 54,  65,  25,  63,  161, 1,   216, 80,  73,  209, 76,  132, 187, 208, 89,
    18,  169, 200, 196, 135, 130, 116, 188, 159, 86,  164, 100, 109, 198, 173, 186, 3,   64,  52,  217, 226, 250,
    124, 123, 5,   202, 38,  147, 118, 126, 255, 82,  85,  212, 207, 206, 59,  227, 47,  16,  58,  17,  182, 189,
    28,  42,  223, 183, 170, 213, 119, 248, 152, 2,   44,  154, 163, 70,  221, 153, 101, 155, 167, 43,  172, 9,
    129, 22,  39,  253, 19,  98,  108, 110, 79,  113, 224, 232, 178, 185, 112, 104, 218, 246, 97,  228, 251, 34,
    242, 193, 238, 210, 144, 12,  191, 179, 162, 241, 81,  51,  145, 235, 249, 14,  239, 107, 49,  192, 214, 31,
    181, 199, 106, 157, 184, 84,  204, 176, 115, 121, 50,  45,  127, 4,   150, 254, 138, 236, 205, 93,  222, 114,
    67,  29,  24,  72,  243, 141, 128, 195, 78,  66,  215, 61,  156, 180};

//-----------------------------------------------------------------------
PUNoise3D::PUNoise3D() : _octaves(2), _frequency(1.0f), _amplitude(1.0f), _persistence(1.0f) {}
//-----------------------------------------------------------------------
PUNoise3D::~PUNoise3D() {}
//-----------------------------------------------------------------------
void PUNoise3D::initialise(unsigned short octaves, double frequency, double amplitude, double persistence)
{
    _octaves     = octaves;
    _frequency   = frequency;
    _amplitude   = amplitude;
    _persistence = persistence;

    for (int i = 0; i < 256; ++i)
    {
        _p[i]       = permutation[i];
        _p[256 + i] = permutation[i];
    }
}
//-----------------------------------------------------------------------
// void Noise3D::noise2img(unsigned short dimension)
//{
//	double x = 0.0;
//	double y = 0.0;
//	double step = 1.0 / (double)dimension;
//	size_t buffSize = 4 * dimension * dimension; // Assume Image of pixelformat 32 bits (i.e. PF_R8G8B8A8)
//	unsigned char* buff = new unsigned char[buffSize];
//	size_t p = 0;
//	while (p < buffSize)
//	{
//		unsigned char n = (unsigned char)(255 * noise(x, y, 0.5));
//		buff[p] = n;
//		buff[p+1] = n;
//		buff[p+2] = n;
//		buff[p+3] = n;
//		p += 4;
//
//		x += step;
//		if (x >= 1.0)
//		{
//			x = 0.0;
//			y += step;
//		}
//	}
//	Ogre::Image* image = new Ogre::Image();
//	image->loadDynamicImage(buff, dimension, dimension, 0, Ogre::PF_R8G8B8A8 , false, 1, 0);
//	image->save("noise2img.png");
//	delete image;
//	delete [] buff;
//}
//-----------------------------------------------------------------------
double PUNoise3D::noise(const Vec3& position)
{
    return noise(position.x, position.y, position.z);
}
//-----------------------------------------------------------------------
double PUNoise3D::noise(double x, double y, double z)
{
    double n    = 0;
    double freq = _frequency;
    double ampl = _amplitude;
    for (unsigned short u = 0; u < _octaves; ++u)
    {
        n += genNoise(x * freq, y * freq, z * freq) * ampl;
        freq *= 2;
        ampl *= _persistence;
    }
    return n;
}
//-----------------------------------------------------------------------
double PUNoise3D::genNoise(double x, double y, double z)
{
    int X = (int)floor(x) & 255;
    int Y = (int)floor(y) & 255;
    int Z = (int)floor(z) & 255;
    x -= floor(x);
    y -= floor(y);
    z -= floor(z);
    double u = fade(x);
    double v = fade(y);
    double w = fade(z);
    int A = _p[X] + Y, AA = _p[A] + Z, AB = _p[A + 1] + Z;
    int B = _p[X + 1] + Y, BA = _p[B] + Z, BB = _p[B + 1] + Z;

    double lrp = lerp(w,
                      lerp(v, lerp(u, grad(_p[AA], x, y, z), grad(_p[BA], x - 1, y, z)),
                           lerp(u, grad(_p[AB], x, y - 1, z), grad(_p[BB], x - 1, y - 1, z))),
                      lerp(v, lerp(u, grad(_p[AA + 1], x, y, z - 1), grad(_p[BA + 1], x - 1, y, z - 1)),
                           lerp(u, grad(_p[AB + 1], x, y - 1, z - 1), grad(_p[BB + 1], x - 1, y - 1, z - 1))));
    return fabs(lrp);  // Use absolute value, because lrp in between [-1, 1]
}
//-----------------------------------------------------------------------
double PUNoise3D::fade(double t)
{
    return t * t * t * (t * (t * 6 - 15) + 10);
}
//-----------------------------------------------------------------------
double PUNoise3D::lerp(double t, double a, double b)
{
    return a + t * (b - a);
}
//-----------------------------------------------------------------------
double PUNoise3D::grad(int hash, double x, double y, double z)
{
    int h    = hash & 15;
    double u = h < 8 ? x : y;
    double v = h < 4 ? y : h == 12 || h == 14 ? x : z;
    return ((h & 1) == 0 ? u : -u) + ((h & 2) == 0 ? v : -v);
}

NS_CC_END