mirror of https://github.com/axmolengine/axmol.git
155 lines
6.4 KiB
C++
155 lines
6.4 KiB
C++
/****************************************************************************
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Copyright (C) 2013 Henry van Merode. All rights reserved.
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Copyright (c) 2015-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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https://axmolengine.github.io/
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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_AX_BEGIN
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static int permutation[] = {
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151, 160, 137, 91, 90, 15, 131, 13, 201, 95, 96, 53, 194, 233, 7, 225, 140, 36, 103, 30, 69, 142,
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8, 99, 37, 240, 21, 10, 23, 190, 6, 148, 247, 120, 234, 75, 0, 26, 197, 62, 94, 252, 219, 203,
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117, 35, 11, 32, 57, 177, 33, 88, 237, 149, 56, 87, 174, 20, 125, 136, 171, 168, 68, 175, 74, 165,
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71, 134, 139, 48, 27, 166, 77, 146, 158, 231, 83, 111, 229, 122, 60, 211, 133, 230, 220, 105, 92, 41,
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55, 46, 245, 40, 244, 102, 143, 54, 65, 25, 63, 161, 1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
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18, 169, 200, 196, 135, 130, 116, 188, 159, 86, 164, 100, 109, 198, 173, 186, 3, 64, 52, 217, 226, 250,
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124, 123, 5, 202, 38, 147, 118, 126, 255, 82, 85, 212, 207, 206, 59, 227, 47, 16, 58, 17, 182, 189,
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28, 42, 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, 251, 34,
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242, 193, 238, 210, 144, 12, 191, 179, 162, 241, 81, 51, 145, 235, 249, 14, 239, 107, 49, 192, 214, 31,
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181, 199, 106, 157, 184, 84, 204, 176, 115, 121, 50, 45, 127, 4, 150, 254, 138, 236, 205, 93, 222, 114,
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67, 29, 24, 72, 243, 141, 128, 195, 78, 66, 215, 61, 156, 180};
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//-----------------------------------------------------------------------
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PUNoise3D::PUNoise3D() : _octaves(2), _frequency(1.0f), _amplitude(1.0f), _persistence(1.0f) {}
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//-----------------------------------------------------------------------
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PUNoise3D::~PUNoise3D() {}
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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 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 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,
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lerp(v, lerp(u, grad(_p[AA], x, y, z), grad(_p[BA], x - 1, y, z)),
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lerp(u, grad(_p[AB], x, y - 1, z), grad(_p[BB], x - 1, y - 1, z))),
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lerp(v, lerp(u, grad(_p[AA + 1], x, y, z - 1), grad(_p[BA + 1], x - 1, y, z - 1)),
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lerp(u, grad(_p[AB + 1], x, y - 1, z - 1), 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_AX_END
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