mirror of https://github.com/axmolengine/axmol.git
166 lines
6.0 KiB
C++
166 lines
6.0 KiB
C++
/****************************************************************************
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Copyright (C) 2013 Henry van Merode. All rights reserved.
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Copyright (c) 2015 Chukong Technologies Inc.
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#include "CCPUNoise.h"
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NS_CC_BEGIN
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static int permutation[] = { 151,160,137,91,90,15,
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131,13,201,95,96,53,194,233,7,225,140,36,103,30,69,142,8,99,37,240,21,10,23,
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190, 6,148,247,120,234,75,0,26,197,62,94,252,219,203,117,35,11,32,57,177,33,
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88,237,149,56,87,174,20,125,136,171,168, 68,175,74,165,71,134,139,48,27,166,
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77,146,158,231,83,111,229,122,60,211,133,230,220,105,92,41,55,46,245,40,244,
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102,143,54, 65,25,63,161, 1,216,80,73,209,76,132,187,208, 89,18,169,200,196,
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135,130,116,188,159,86,164,100,109,198,173,186, 3,64,52,217,226,250,124,123,
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5,202,38,147,118,126,255,82,85,212,207,206,59,227,47,16,58,17,182,189,28,42,
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223,183,170,213,119,248,152, 2,44,154,163, 70,221,153,101,155,167, 43,172,9,
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129,22,39,253, 19,98,108,110,79,113,224,232,178,185, 112,104,218,246,97,228,
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251,34,242,193,238,210,144,12,191,179,162,241, 81,51,145,235,249,14,239,107,
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49,192,214, 31,181,199,106,157,184, 84,204,176,115,121,50,45,127, 4,150,254,
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138,236,205,93,222,114,67,29,24,72,243,141,128,195,78,66,215,61,156,180
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};
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//-----------------------------------------------------------------------
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PUNoise3D::PUNoise3D(void) :
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_octaves(2),
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_frequency(1.0f),
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_amplitude(1.0f),
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_persistence(1.0f)
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{
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}
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//-----------------------------------------------------------------------
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PUNoise3D::~PUNoise3D(void)
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{
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}
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//-----------------------------------------------------------------------
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void PUNoise3D::initialise(unsigned short octaves, double frequency, double amplitude, double persistence)
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{
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_octaves = octaves;
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_frequency = frequency;
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_amplitude = amplitude;
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_persistence = persistence;
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for (int i = 0; i < 256; ++i)
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{
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_p[i] = permutation[i];
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_p[256+i] = permutation[i];
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}
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}
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//-----------------------------------------------------------------------
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//void Noise3D::noise2img(unsigned short dimension)
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//{
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// double x = 0.0;
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// double y = 0.0;
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// double step = 1.0 / (double)dimension;
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// size_t buffSize = 4 * dimension * dimension; // Assume Image of pixelformat 32 bits (i.e. PF_R8G8B8A8)
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// unsigned char* buff = new (std::nothrow) unsigned char[buffSize];
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// size_t p = 0;
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// while (p < buffSize)
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// {
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// unsigned char n = (unsigned char)(255 * noise(x, y, 0.5));
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// buff[p] = n;
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// buff[p+1] = n;
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// buff[p+2] = n;
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// buff[p+3] = n;
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// p += 4;
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//
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// x += step;
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// if (x >= 1.0)
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// {
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// x = 0.0;
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// y += step;
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// }
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// }
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// Ogre::Image* image = new (std::nothrow) Ogre::Image();
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// image->loadDynamicImage(buff, dimension, dimension, 0, Ogre::PF_R8G8B8A8 , false, 1, 0);
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// image->save("noise2img.png");
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// delete image;
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// delete [] buff;
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//}
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//-----------------------------------------------------------------------
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double PUNoise3D::noise(const Vec3& position)
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{
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return noise(position.x, position.y, position.z);
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}
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//-----------------------------------------------------------------------
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double PUNoise3D::noise(double x, double y, double z)
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{
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double n = 0;
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double freq = _frequency;
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double ampl = _amplitude;
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for (unsigned short u = 0; u < _octaves; ++u)
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{
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n += genNoise(x * freq, y * freq, z * freq) * ampl;
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freq *= 2;
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ampl *= _persistence;
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}
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return n;
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}
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//-----------------------------------------------------------------------
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double PUNoise3D::genNoise(double x, double y, double z)
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{
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int X = (int)floor(x) & 255;
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int Y = (int)floor(y) & 255;
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int Z = (int)floor(z) & 255;
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x -= floor(x);
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y -= floor(y);
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z -= floor(z);
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double u = fade(x);
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double v = fade(y);
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double w = fade(z);
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int A = _p[X ]+Y, AA = _p[A]+Z, AB = _p[A+1]+Z;
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int B = _p[X+1]+Y, BA = _p[B]+Z, BB = _p[B+1]+Z;
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double lrp = lerp(w, lerp(v, lerp(u, grad(_p[AA], x, y, z),
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grad(_p[BA], x-1, y, z)),
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lerp(u, grad(_p[AB], x, y-1, z),
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grad(_p[BB], x-1, y-1, z))),
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lerp(v, lerp(u, grad(_p[AA+1], x, y , z-1),
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grad(_p[BA+1], x-1, y, z-1)),
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lerp(u, grad(_p[AB+1], x, y-1, z-1),
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grad(_p[BB+1], x-1, y-1, z-1))));
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return fabs(lrp); // Use absolute value, because lrp in between [-1, 1]
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}
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//-----------------------------------------------------------------------
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double PUNoise3D::fade(double t)
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{
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return t * t * t * (t * (t * 6 - 15) + 10);
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}
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//-----------------------------------------------------------------------
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double PUNoise3D::lerp(double t, double a, double b)
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{
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return a + t * (b - a);
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}
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//-----------------------------------------------------------------------
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double PUNoise3D::grad(int hash, double x, double y, double z)
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{
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int h = hash & 15;
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double u = h<8 ? x : y;
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double v = h<4 ? y : h==12||h==14 ? x : z;
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return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
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}
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NS_CC_END
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