/*
 *
 * $Id$
 *
 * ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version. The Blender
 * Foundation also sells licenses for use in proprietary software under
 * the Blender License.  See http://www.blender.org/BL/ for information
 * about this.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL/BL DUAL LICENSE BLOCK *****
 *
 */

#ifdef _WIN32 	 
#pragma warning (disable : 4244) // "conversion from double to float"
#pragma warning (disable : 4305) // "truncation from const double to float" 
#endif

#include <math.h>
#include "BLI_blenlib.h"

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

/* local */
float noise3_perlin(float vec[3]);
float turbulence_perlin(float *point, float lofreq, float hifreq);
float turbulencep(float noisesize, float x, float y, float z, int nr);

#define HASHVEC(x,y,z) hashvectf+3*hash[ (hash[ (hash[(z) & 255]+(y)) & 255]+(x)) & 255]

/* needed for voronoi */
#define HASHPNT(x,y,z) hashpntf+3*hash[ (hash[ (hash[(z) & 255]+(y)) & 255]+(x)) & 255]
static float hashpntf[768] = {0.536902, 0.020915, 0.501445, 0.216316, 0.517036, 0.822466, 0.965315,
0.377313, 0.678764, 0.744545, 0.097731, 0.396357, 0.247202, 0.520897,
0.613396, 0.542124, 0.146813, 0.255489, 0.810868, 0.638641, 0.980742,
0.292316, 0.357948, 0.114382, 0.861377, 0.629634, 0.722530, 0.714103,
0.048549, 0.075668, 0.564920, 0.162026, 0.054466, 0.411738, 0.156897,
0.887657, 0.599368, 0.074249, 0.170277, 0.225799, 0.393154, 0.301348,
0.057434, 0.293849, 0.442745, 0.150002, 0.398732, 0.184582, 0.915200,
0.630984, 0.974040, 0.117228, 0.795520, 0.763238, 0.158982, 0.616211,
0.250825, 0.906539, 0.316874, 0.676205, 0.234720, 0.667673, 0.792225,
0.273671, 0.119363, 0.199131, 0.856716, 0.828554, 0.900718, 0.705960,
0.635923, 0.989433, 0.027261, 0.283507, 0.113426, 0.388115, 0.900176,
0.637741, 0.438802, 0.715490, 0.043692, 0.202640, 0.378325, 0.450325,
0.471832, 0.147803, 0.906899, 0.524178, 0.784981, 0.051483, 0.893369,
0.596895, 0.275635, 0.391483, 0.844673, 0.103061, 0.257322, 0.708390,
0.504091, 0.199517, 0.660339, 0.376071, 0.038880, 0.531293, 0.216116,
0.138672, 0.907737, 0.807994, 0.659582, 0.915264, 0.449075, 0.627128,
0.480173, 0.380942, 0.018843, 0.211808, 0.569701, 0.082294, 0.689488, 
0.573060, 0.593859, 0.216080, 0.373159, 0.108117, 0.595539, 0.021768, 
0.380297, 0.948125, 0.377833, 0.319699, 0.315249, 0.972805, 0.792270, 
0.445396, 0.845323, 0.372186, 0.096147, 0.689405, 0.423958, 0.055675, 
0.117940, 0.328456, 0.605808, 0.631768, 0.372170, 0.213723, 0.032700, 
0.447257, 0.440661, 0.728488, 0.299853, 0.148599, 0.649212, 0.498381,
0.049921, 0.496112, 0.607142, 0.562595, 0.990246, 0.739659, 0.108633, 
0.978156, 0.209814, 0.258436, 0.876021, 0.309260, 0.600673, 0.713597, 
0.576967, 0.641402, 0.853930, 0.029173, 0.418111, 0.581593, 0.008394, 
0.589904, 0.661574, 0.979326, 0.275724, 0.111109, 0.440472, 0.120839, 
0.521602, 0.648308, 0.284575, 0.204501, 0.153286, 0.822444, 0.300786, 
0.303906, 0.364717, 0.209038, 0.916831, 0.900245, 0.600685, 0.890002, 
0.581660, 0.431154, 0.705569, 0.551250, 0.417075, 0.403749, 0.696652, 
0.292652, 0.911372, 0.690922, 0.323718, 0.036773, 0.258976, 0.274265, 
0.225076, 0.628965, 0.351644, 0.065158, 0.080340, 0.467271, 0.130643,
0.385914, 0.919315, 0.253821, 0.966163, 0.017439, 0.392610, 0.478792, 
0.978185, 0.072691, 0.982009, 0.097987, 0.731533, 0.401233, 0.107570, 
0.349587, 0.479122, 0.700598, 0.481751, 0.788429, 0.706864, 0.120086, 
0.562691, 0.981797, 0.001223, 0.192120, 0.451543, 0.173092, 0.108960,
0.549594, 0.587892, 0.657534, 0.396365, 0.125153, 0.666420, 0.385823, 
0.890916, 0.436729, 0.128114, 0.369598, 0.759096, 0.044677, 0.904752, 
0.088052, 0.621148, 0.005047, 0.452331, 0.162032, 0.494238, 0.523349, 
0.741829, 0.698450, 0.452316, 0.563487, 0.819776, 0.492160, 0.004210, 
0.647158, 0.551475, 0.362995, 0.177937, 0.814722, 0.727729, 0.867126, 
0.997157, 0.108149, 0.085726, 0.796024, 0.665075, 0.362462, 0.323124,
0.043718, 0.042357, 0.315030, 0.328954, 0.870845, 0.683186, 0.467922, 
0.514894, 0.809971, 0.631979, 0.176571, 0.366320, 0.850621, 0.505555, 
0.749551, 0.750830, 0.401714, 0.481216, 0.438393, 0.508832, 0.867971, 
0.654581, 0.058204, 0.566454, 0.084124, 0.548539, 0.902690, 0.779571, 
0.562058, 0.048082, 0.863109, 0.079290, 0.713559, 0.783496, 0.265266, 
0.672089, 0.786939, 0.143048, 0.086196, 0.876129, 0.408708, 0.229312, 
0.629995, 0.206665, 0.207308, 0.710079, 0.341704, 0.264921, 0.028748, 
0.629222, 0.470173, 0.726228, 0.125243, 0.328249, 0.794187, 0.741340, 
0.489895, 0.189396, 0.724654, 0.092841, 0.039809, 0.860126, 0.247701, 
0.655331, 0.964121, 0.672536, 0.044522, 0.690567, 0.837238, 0.631520, 
0.953734, 0.352484, 0.289026, 0.034152, 0.852575, 0.098454, 0.795529, 
0.452181, 0.826159, 0.186993, 0.820725, 0.440328, 0.922137, 0.704592,
0.915437, 0.738183, 0.733461, 0.193798, 0.929213, 0.161390, 0.318547,
0.888751, 0.430968, 0.740837, 0.193544, 0.872253, 0.563074, 0.274598, 
0.347805, 0.666176, 0.449831, 0.800991, 0.588727, 0.052296, 0.714761, 
0.420620, 0.570325, 0.057550, 0.210888, 0.407312, 0.662848, 0.924382, 
0.895958, 0.775198, 0.688605, 0.025721, 0.301913, 0.791408, 0.500602, 
0.831984, 0.828509, 0.642093, 0.494174, 0.525880, 0.446365, 0.440063, 
0.763114, 0.630358, 0.223943, 0.333806, 0.906033, 0.498306, 0.241278,
0.427640, 0.772683, 0.198082, 0.225379, 0.503894, 0.436599, 0.016503, 
0.803725, 0.189878, 0.291095, 0.499114, 0.151573, 0.079031, 0.904618, 
0.708535, 0.273900, 0.067419, 0.317124, 0.936499, 0.716511, 0.543845, 
0.939909, 0.826574, 0.715090, 0.154864, 0.750150, 0.845808, 0.648108, 
0.556564, 0.644757, 0.140873, 0.799167, 0.632989, 0.444245, 0.471978, 
0.435910, 0.359793, 0.216241, 0.007633, 0.337236, 0.857863, 0.380247, 
0.092517, 0.799973, 0.919000, 0.296798, 0.096989, 0.854831, 0.165369, 
0.568475, 0.216855, 0.020457, 0.835511, 0.538039, 0.999742, 0.620226, 
0.244053, 0.060399, 0.323007, 0.294874, 0.988899, 0.384919, 0.735655, 
0.773428, 0.549776, 0.292882, 0.660611, 0.593507, 0.621118, 0.175269, 
0.682119, 0.794493, 0.868197, 0.632150, 0.807823, 0.509656, 0.482035, 
0.001780, 0.259126, 0.358002, 0.280263, 0.192985, 0.290367, 0.208111, 
0.917633, 0.114422, 0.925491, 0.981110, 0.255570, 0.974862, 0.016629,
0.552599, 0.575741, 0.612978, 0.615965, 0.803615, 0.772334, 0.089745, 
0.838812, 0.634542, 0.113709, 0.755832, 0.577589, 0.667489, 0.529834,
0.325660, 0.817597, 0.316557, 0.335093, 0.737363, 0.260951, 0.737073, 
0.049540, 0.735541, 0.988891, 0.299116, 0.147695, 0.417271, 0.940811, 
0.524160, 0.857968, 0.176403, 0.244835, 0.485759, 0.033353, 0.280319, 
0.750688, 0.755809, 0.924208, 0.095956, 0.962504, 0.275584, 0.173715,
0.942716, 0.706721, 0.078464, 0.576716, 0.804667, 0.559249, 0.900611, 
0.646904, 0.432111, 0.927885, 0.383277, 0.269973, 0.114244, 0.574867, 
0.150703, 0.241855, 0.272871, 0.199950, 0.079719, 0.868566, 0.962833, 
0.789122, 0.320025, 0.905554, 0.234876, 0.991356, 0.061913, 0.732911, 
0.785960, 0.874074, 0.069035, 0.658632, 0.309901, 0.023676, 0.791603, 
0.764661, 0.661278, 0.319583, 0.829650, 0.117091, 0.903124, 0.982098, 
0.161631, 0.193576, 0.670428, 0.857390, 0.003760, 0.572578, 0.222162, 
0.114551, 0.420118, 0.530404, 0.470682, 0.525527, 0.764281, 0.040596, 
0.443275, 0.501124, 0.816161, 0.417467, 0.332172, 0.447565, 0.614591, 
0.559246, 0.805295, 0.226342, 0.155065, 0.714630, 0.160925, 0.760001, 
0.453456, 0.093869, 0.406092, 0.264801, 0.720370, 0.743388, 0.373269, 
0.403098, 0.911923, 0.897249, 0.147038, 0.753037, 0.516093, 0.739257, 
0.175018, 0.045768, 0.735857, 0.801330, 0.927708, 0.240977, 0.591870,
0.921831, 0.540733, 0.149100, 0.423152, 0.806876, 0.397081, 0.061100, 
0.811630, 0.044899, 0.460915, 0.961202, 0.822098, 0.971524, 0.867608, 
0.773604, 0.226616, 0.686286, 0.926972, 0.411613, 0.267873, 0.081937, 
0.226124, 0.295664, 0.374594, 0.533240, 0.237876, 0.669629, 0.599083, 
0.513081, 0.878719, 0.201577, 0.721296, 0.495038, 0.079760, 0.965959,
0.233090, 0.052496, 0.714748, 0.887844, 0.308724, 0.972885, 0.723337,
0.453089, 0.914474, 0.704063, 0.823198, 0.834769, 0.906561, 0.919600,
0.100601, 0.307564, 0.901977, 0.468879, 0.265376, 0.885188, 0.683875,
0.868623, 0.081032, 0.466835, 0.199087, 0.663437, 0.812241, 0.311337,
0.821361, 0.356628, 0.898054, 0.160781, 0.222539, 0.714889, 0.490287,
0.984915, 0.951755, 0.964097, 0.641795, 0.815472, 0.852732, 0.862074,
0.051108, 0.440139, 0.323207, 0.517171, 0.562984, 0.115295, 0.743103,
0.977914, 0.337596, 0.440694, 0.535879, 0.959427, 0.351427, 0.704361,
0.010826, 0.131162, 0.577080, 0.349572, 0.774892, 0.425796, 0.072697,
0.500001, 0.267322, 0.909654, 0.206176, 0.223987, 0.937698, 0.323423,
0.117501, 0.490308, 0.474372, 0.689943, 0.168671, 0.719417, 0.188928,
0.330464, 0.265273, 0.446271, 0.171933, 0.176133, 0.474616, 0.140182,
0.114246, 0.905043, 0.713870, 0.555261, 0.951333};

unsigned char hash[512]= {
0xA2,0xA0,0x19,0x3B,0xF8,0xEB,0xAA,0xEE,0xF3,0x1C,0x67,0x28,0x1D,0xED,0x0,0xDE,0x95,0x2E,0xDC,0x3F,0x3A,0x82,0x35,0x4D,0x6C,0xBA,0x36,0xD0,0xF6,0xC,0x79,0x32,0xD1,0x59,0xF4,0x8,0x8B,0x63,0x89,0x2F,0xB8,0xB4,0x97,0x83,0xF2,0x8F,0x18,0xC7,0x51,0x14,0x65,0x87,0x48,0x20,0x42,0xA8,0x80,0xB5,0x40,0x13,0xB2,0x22,0x7E,0x57,
0xBC,0x7F,0x6B,0x9D,0x86,0x4C,0xC8,0xDB,0x7C,0xD5,0x25,0x4E,0x5A,0x55,0x74,0x50,0xCD,0xB3,0x7A,0xBB,0xC3,0xCB,0xB6,0xE2,0xE4,0xEC,0xFD,0x98,0xB,0x96,0xD3,0x9E,0x5C,0xA1,0x64,0xF1,0x81,0x61,0xE1,0xC4,0x24,0x72,0x49,0x8C,0x90,0x4B,0x84,0x34,0x38,0xAB,0x78,0xCA,0x1F,0x1,0xD7,0x93,0x11,0xC1,0x58,0xA9,0x31,0xF9,0x44,0x6D,
0xBF,0x33,0x9C,0x5F,0x9,0x94,0xA3,0x85,0x6,0xC6,0x9A,0x1E,0x7B,0x46,0x15,0x30,0x27,0x2B,0x1B,0x71,0x3C,0x5B,0xD6,0x6F,0x62,0xAC,0x4F,0xC2,0xC0,0xE,0xB1,0x23,0xA7,0xDF,0x47,0xB0,0x77,0x69,0x5,0xE9,0xE6,0xE7,0x76,0x73,0xF,0xFE,0x6E,0x9B,0x56,0xEF,0x12,0xA5,0x37,0xFC,0xAE,0xD9,0x3,0x8E,0xDD,0x10,0xB9,0xCE,0xC9,0x8D,
0xDA,0x2A,0xBD,0x68,0x17,0x9F,0xBE,0xD4,0xA,0xCC,0xD2,0xE8,0x43,0x3D,0x70,0xB7,0x2,0x7D,0x99,0xD8,0xD,0x60,0x8A,0x4,0x2C,0x3E,0x92,0xE5,0xAF,0x53,0x7,0xE0,0x29,0xA6,0xC5,0xE3,0xF5,0xF7,0x4A,0x41,0x26,0x6A,0x16,0x5E,0x52,0x2D,0x21,0xAD,0xF0,0x91,0xFF,0xEA,0x54,0xFA,0x66,0x1A,0x45,0x39,0xCF,0x75,0xA4,0x88,0xFB,0x5D,
0xA2,0xA0,0x19,0x3B,0xF8,0xEB,0xAA,0xEE,0xF3,0x1C,0x67,0x28,0x1D,0xED,0x0,0xDE,0x95,0x2E,0xDC,0x3F,0x3A,0x82,0x35,0x4D,0x6C,0xBA,0x36,0xD0,0xF6,0xC,0x79,0x32,0xD1,0x59,0xF4,0x8,0x8B,0x63,0x89,0x2F,0xB8,0xB4,0x97,0x83,0xF2,0x8F,0x18,0xC7,0x51,0x14,0x65,0x87,0x48,0x20,0x42,0xA8,0x80,0xB5,0x40,0x13,0xB2,0x22,0x7E,0x57,
0xBC,0x7F,0x6B,0x9D,0x86,0x4C,0xC8,0xDB,0x7C,0xD5,0x25,0x4E,0x5A,0x55,0x74,0x50,0xCD,0xB3,0x7A,0xBB,0xC3,0xCB,0xB6,0xE2,0xE4,0xEC,0xFD,0x98,0xB,0x96,0xD3,0x9E,0x5C,0xA1,0x64,0xF1,0x81,0x61,0xE1,0xC4,0x24,0x72,0x49,0x8C,0x90,0x4B,0x84,0x34,0x38,0xAB,0x78,0xCA,0x1F,0x1,0xD7,0x93,0x11,0xC1,0x58,0xA9,0x31,0xF9,0x44,0x6D,
0xBF,0x33,0x9C,0x5F,0x9,0x94,0xA3,0x85,0x6,0xC6,0x9A,0x1E,0x7B,0x46,0x15,0x30,0x27,0x2B,0x1B,0x71,0x3C,0x5B,0xD6,0x6F,0x62,0xAC,0x4F,0xC2,0xC0,0xE,0xB1,0x23,0xA7,0xDF,0x47,0xB0,0x77,0x69,0x5,0xE9,0xE6,0xE7,0x76,0x73,0xF,0xFE,0x6E,0x9B,0x56,0xEF,0x12,0xA5,0x37,0xFC,0xAE,0xD9,0x3,0x8E,0xDD,0x10,0xB9,0xCE,0xC9,0x8D,
0xDA,0x2A,0xBD,0x68,0x17,0x9F,0xBE,0xD4,0xA,0xCC,0xD2,0xE8,0x43,0x3D,0x70,0xB7,0x2,0x7D,0x99,0xD8,0xD,0x60,0x8A,0x4,0x2C,0x3E,0x92,0xE5,0xAF,0x53,0x7,0xE0,0x29,0xA6,0xC5,0xE3,0xF5,0xF7,0x4A,0x41,0x26,0x6A,0x16,0x5E,0x52,0x2D,0x21,0xAD,0xF0,0x91,0xFF,0xEA,0x54,0xFA,0x66,0x1A,0x45,0x39,0xCF,0x75,0xA4,0x88,0xFB,0x5D,
};


float hashvectf[768]= {
0.33783,0.715698,-0.611206,-0.944031,-0.326599,-0.045624,-0.101074,-0.416443,-0.903503,0.799286,0.49411,-0.341949,-0.854645,0.518036,0.033936,0.42514,-0.437866,-0.792114,-0.358948,0.597046,0.717377,-0.985413,0.144714,0.089294,-0.601776,-0.33728,-0.723907,-0.449921,0.594513,0.666382,0.208313,-0.10791,
0.972076,0.575317,0.060425,0.815643,0.293365,-0.875702,-0.383453,0.293762,0.465759,0.834686,-0.846008,-0.233398,-0.47934,-0.115814,0.143036,-0.98291,0.204681,-0.949036,-0.239532,0.946716,-0.263947,0.184326,-0.235596,0.573822,0.784332,0.203705,-0.372253,-0.905487,0.756989,-0.651031,0.055298,0.497803,
0.814697,-0.297363,-0.16214,0.063995,-0.98468,-0.329254,0.834381,0.441925,0.703827,-0.527039,-0.476227,0.956421,0.266113,0.119781,0.480133,0.482849,0.7323,-0.18631,0.961212,-0.203125,-0.748474,-0.656921,-0.090393,-0.085052,-0.165253,0.982544,-0.76947,0.628174,-0.115234,0.383148,0.537659,0.751068,
0.616486,-0.668488,-0.415924,-0.259979,-0.630005,0.73175,0.570953,-0.087952,0.816223,-0.458008,0.023254,0.888611,-0.196167,0.976563,-0.088287,-0.263885,-0.69812,-0.665527,0.437134,-0.892273,-0.112793,-0.621674,-0.230438,0.748566,0.232422,0.900574,-0.367249,0.22229,-0.796143,0.562744,-0.665497,-0.73764,
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};

/**************************/
/*  IMPROVED PERLIN NOISE */
/**************************/

#define lerp(t, a, b) ((a)+(t)*((b)-(a)))
#define npfade(t) ((t)*(t)*(t)*((t)*((t)*6-15)+10))

static float grad(int hash, float x, float y, float z)
{
	int h = hash & 15;                     // CONVERT LO 4 BITS OF HASH CODE
	float u = h<8 ? x : y,                 // INTO 12 GRADIENT DIRECTIONS.
				v = h<4 ? y : h==12||h==14 ? x : z;
	return ((h&1) == 0 ? u : -u) + ((h&2) == 0 ? v : -v);
}

/* instead of adding another permutation array, just use hash table defined above */
static float newPerlin(float x, float y, float z)
{
	int A, AA, AB, B, BA, BB;
	float u=floor(x), v=floor(y), w=floor(z);
	int X=((int)u) & 255, Y=((int)v) & 255, Z=((int)w) & 255;	// FIND UNIT CUBE THAT CONTAINS POINT
	x -= u;             // FIND RELATIVE X,Y,Z
	y -= v;             // OF POINT IN CUBE.
	z -= w;
	u = npfade(x);      // COMPUTE FADE CURVES
	v = npfade(y);      // FOR EACH OF X,Y,Z.
	w = npfade(z);
	A = hash[X  ]+Y;  AA = hash[A]+Z;  AB = hash[A+1]+Z;      // HASH COORDINATES OF
	B = hash[X+1]+Y;  BA = hash[B]+Z;  BB = hash[B+1]+Z;      // THE 8 CUBE CORNERS,
	return lerp(w, lerp(v, lerp(u, grad(hash[AA  ], x  , y  , z   ),  // AND ADD
																grad(hash[BA  ], x-1, y  , z   )), // BLENDED
												lerp(u, grad(hash[AB  ], x  , y-1, z   ),  // RESULTS
																grad(hash[BB  ], x-1, y-1, z   ))),// FROM  8
								lerp(v, lerp(u, grad(hash[AA+1], x  , y  , z-1 ),  // CORNERS
																grad(hash[BA+1], x-1, y  , z-1 )), // OF CUBE
												lerp(u, grad(hash[AB+1], x  , y-1, z-1 ),
																grad(hash[BB+1], x-1, y-1, z-1 ))));
}

/* for use with BLI_gNoise()/BLI_gTurbulence(), returns unsigned improved perlin noise */
static float newPerlinU(float x, float y, float z)
{
	return (0.5+0.5*newPerlin(x, y, z));
}


/**************************/
/* END OF IMPROVED PERLIN */
/**************************/

/* Was BLI_hnoise(), removed noisesize, so other functions can call it without scaling. */
static float orgBlenderNoise(float x, float y, float z)
{
	register float cn1, cn2, cn3, cn4, cn5, cn6, i, *h;
	float ox, oy, oz, jx, jy, jz;
	float n= 0.5;
	int ix, iy, iz, b00, b01, b10, b11, b20, b21;

	ox= (x- (ix= (int)floor(x)) );
	oy= (y- (iy= (int)floor(y)) );
	oz= (z- (iz= (int)floor(z)) );

	jx= ox-1;
	jy= oy-1;
	jz= oz-1;

	cn1=ox*ox; cn2=oy*oy; cn3=oz*oz;
	cn4=jx*jx; cn5=jy*jy; cn6=jz*jz;

	cn1= 1.0-3.0*cn1+2.0*cn1*ox;
	cn2= 1.0-3.0*cn2+2.0*cn2*oy;
	cn3= 1.0-3.0*cn3+2.0*cn3*oz;
	cn4= 1.0-3.0*cn4-2.0*cn4*jx;
	cn5= 1.0-3.0*cn5-2.0*cn5*jy;
	cn6= 1.0-3.0*cn6-2.0*cn6*jz;

	b00= hash[ hash[ix & 255]+(iy & 255)];
	b10= hash[ hash[(ix+1) & 255]+(iy & 255)];
	b01= hash[ hash[ix & 255]+((iy+1) & 255)];
	b11= hash[ hash[(ix+1) & 255]+((iy+1) & 255)];

	b20=iz & 255; b21= (iz+1) & 255;

		/* 0 */
	i= (cn1*cn2*cn3);
		h=hashvectf+ 3*hash[b20+b00];
		n+= i*(h[0]*ox+h[1]*oy+h[2]*oz);
		/* 1 */
	i= (cn1*cn2*cn6);
		h=hashvectf+ 3*hash[b21+b00];
		n+= i*(h[0]*ox+h[1]*oy+h[2]*jz);
		/* 2 */
	i= (cn1*cn5*cn3);
		h=hashvectf+ 3*hash[b20+b01];
		n+= i*(h[0]*ox+h[1]*jy+h[2]*oz);
		/* 3 */
	i= (cn1*cn5*cn6);
		h=hashvectf+ 3*hash[b21+b01];
		n+= i*(h[0]*ox+h[1]*jy+h[2]*jz);
		/* 4 */
	i= cn4*cn2*cn3;
		h=hashvectf+ 3*hash[b20+b10];
		n+= i*(h[0]*jx+h[1]*oy+h[2]*oz);
		/* 5 */
	i= cn4*cn2*cn6;
		h=hashvectf+ 3*hash[b21+b10];
		n+= i*(h[0]*jx+h[1]*oy+h[2]*jz);
		/* 6 */
	i= cn4*cn5*cn3;
		h=hashvectf+ 3*hash[b20+b11];
		n+=  i*(h[0]*jx+h[1]*jy+h[2]*oz);
		/* 7 */
	i= (cn4*cn5*cn6);
		h=hashvectf+ 3*hash[b21+b11];
		n+= i*(h[0]*jx+h[1]*jy+h[2]*jz);

	if(n<0.0) n=0.0; else if(n>1.0) n=1.0;
	return n;
}

/* as orgBlenderNoise(), returning signed noise */
static float orgBlenderNoiseS(float x, float y, float z)
{
	return (2.0*orgBlenderNoise(x, y, z)-1.0);
}

/* separated from orgBlenderNoise above, with scaling */
float BLI_hnoise(float noisesize, float x, float y, float z)
{
	if(noisesize==0.0) return 0.0;
	x= (1.0+x)/noisesize;
	y= (1.0+y)/noisesize;
	z= (1.0+z)/noisesize;
	return orgBlenderNoise(x, y, z);
}


/* original turbulence functions */
float BLI_turbulence(float noisesize, float x, float y, float z, int nr)
{
	float s, d= 0.5, div=1.0;

	s= BLI_hnoise(noisesize, x, y, z);
	
	while(nr>0) {
	
		s+= d*BLI_hnoise(noisesize*d, x, y, z);
		div+= d;
		d*= 0.5;

		nr--;
	}
	return s/div;
}

float BLI_turbulence1(float noisesize, float x, float y, float z, int nr)
{
	float s, d= 0.5, div=1.0;

	s= fabs( (-1.0+2.0*BLI_hnoise(noisesize, x, y, z)));
	
	while(nr>0) {
	
		s+= fabs(d* (-1.0+2.0*BLI_hnoise(noisesize*d, x, y, z)));
		div+= d;
		d*= 0.5;
		
		nr--;
	}
	return s/div;
}

/* ********************* FROM PERLIN HIMSELF: ******************** */

static char p[512+2]= {
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0.129608,-0.94519,0.299622,-0.357819,0.907654,0.219238,-0.842133,-0.439117,-0.312927,-0.313477,0.84433,0.434479,-0.241211,0.053253,0.968994,0.063873,0.823273,0.563965,0.476288,0.862152,-0.172516,0.620941,-0.298126,0.724915,0.25238,-0.749359,-0.612122,-0.577545,0.386566,0.718994,-0.406342,-0.737976,
0.538696,0.04718,0.556305,0.82959,-0.802856,0.587463,0.101166,-0.707733,-0.705963,0.026428,0.374908,0.68457,0.625092,0.472137,0.208405,-0.856506,-0.703064,-0.581085,-0.409821,-0.417206,-0.736328,0.532623,-0.447876,-0.20285,-0.870728,0.086945,-0.990417,0.107086,0.183685,0.018341,-0.982788,0.560638,
-0.428864,0.708282,0.296722,-0.952576,-0.0672,0.135773,0.990265,0.030243,-0.068787,0.654724,0.752686,0.762604,-0.551758,0.337585,-0.819611,-0.407684,0.402466,-0.727844,-0.55072,-0.408539,-0.855774,-0.480011,0.19281,0.693176,-0.079285,0.716339,0.226013,0.650116,-0.725433,0.246704,0.953369,-0.173553,
-0.970398,-0.239227,-0.03244,0.136383,-0.394318,0.908752,0.813232,0.558167,0.164368,0.40451,0.549042,-0.731323,-0.380249,-0.566711,0.730865,0.022156,0.932739,0.359741,0.00824,0.996552,-0.082306,0.956635,-0.065338,-0.283722,-0.743561,0.008209,0.668579,-0.859589,-0.509674,0.035767,-0.852234,0.363678,
-0.375977,-0.201965,-0.970795,-0.12915,0.313477,0.947327,0.06546,-0.254028,-0.528259,0.81015,0.628052,0.601105,0.49411,-0.494385,0.868378,0.037933,0.275635,-0.086426,0.957336,-0.197937,0.468903,-0.860748,0.895599,0.399384,0.195801,0.560791,0.825012,-0.069214,0.304199,-0.849487,0.43103,0.096375,
0.93576,0.339111,-0.051422,0.408966,-0.911072,0.330444,0.942841,-0.042389,-0.452362,-0.786407,0.420563,0.134308,-0.933472,-0.332489,0.80191,-0.566711,-0.188934,-0.987946,-0.105988,0.112518,-0.24408,0.892242,-0.379791,-0.920502,0.229095,-0.316376,0.7789,0.325958,0.535706,-0.912872,0.185211,-0.36377,
-0.184784,0.565369,-0.803833,-0.018463,0.119537,0.992615,-0.259247,-0.935608,0.239532,-0.82373,-0.449127,-0.345947,-0.433105,0.659515,0.614349,-0.822754,0.378845,-0.423676,0.687195,-0.674835,-0.26889,-0.246582,-0.800842,0.545715,-0.729187,-0.207794,0.651978,0.653534,-0.610443,-0.447388,0.492584,-0.023346,
0.869934,0.609039,0.009094,-0.79306,0.962494,-0.271088,-0.00885,0.2659,-0.004913,0.963959,0.651245,0.553619,-0.518951,0.280548,-0.84314,0.458618,-0.175293,-0.983215,0.049805,0.035339,-0.979919,0.196045,-0.982941,0.164307,-0.082245,0.233734,-0.97226,-0.005005,-0.747253,-0.611328,0.260437,0.645599,
0.592773,0.481384,0.117706,-0.949524,-0.29068,-0.535004,-0.791901,-0.294312,-0.627167,-0.214447,0.748718,-0.047974,-0.813477,-0.57959,-0.175537,0.477264,-0.860992,0.738556,-0.414246,-0.53183,0.562561,-0.704071,0.433289,-0.754944,0.64801,-0.100586,0.114716,0.044525,-0.992371,0.966003,0.244873,-0.082764,
0.33783,0.715698,-0.611206,-0.944031,-0.326599,-0.045624};



#define DOT(a,b) (a[0] * b[0] + a[1] * b[1] + a[2] * b[2])

#define setup(i,b0,b1,r0,r1) \
        t = vec[i] + 10000.; \
        b0 = ((int)t) & 255; \
        b1 = (b0+1) & 255; \
        r0 = t - (int)t; \
        r1 = r0 - 1.;


float noise3_perlin(float vec[3])
{
	int bx0, bx1, by0, by1, bz0, bz1, b00, b10, b01, b11;
	float rx0, rx1, ry0, ry1, rz0, rz1, *q, sx, sy, sz, a, b, c, d, t, u, v;
	register int i, j;


	setup(0, bx0,bx1, rx0,rx1);
	setup(1, by0,by1, ry0,ry1);
	setup(2, bz0,bz1, rz0,rz1);

	i = p[ bx0 ];
	j = p[ bx1 ];

	b00 = p[ i + by0 ];
	b10 = p[ j + by0 ];
	b01 = p[ i + by1 ];
	b11 = p[ j + by1 ];

#define at(rx,ry,rz) ( rx * q[0] + ry * q[1] + rz * q[2] )

#define surve(t) ( t * t * (3. - 2. * t) )

/* lerp moved to improved perlin above */

	sx = surve(rx0);
	sy = surve(ry0);
	sz = surve(rz0);


	q = g[ b00 + bz0 ] ;
	u = at(rx0,ry0,rz0);
	q = g[ b10 + bz0 ] ;
	v = at(rx1,ry0,rz0);
	a = lerp(sx, u, v);

	q = g[ b01 + bz0 ] ;
	u = at(rx0,ry1,rz0);
	q = g[ b11 + bz0 ] ;
	v = at(rx1,ry1,rz0);
	b = lerp(sx, u, v);

	c = lerp(sy, a, b);          /* interpolate in y at lo x */

	q = g[ b00 + bz1 ] ;
	u = at(rx0,ry0,rz1);
	q = g[ b10 + bz1 ] ;
	v = at(rx1,ry0,rz1);
	a = lerp(sx, u, v);

	q = g[ b01 + bz1 ] ;
	u = at(rx0,ry1,rz1);
	q = g[ b11 + bz1 ] ;
	v = at(rx1,ry1,rz1);
	b = lerp(sx, u, v);

	d = lerp(sy, a, b);          /* interpolate in y at hi x */

	return 1.5 * lerp(sz, c, d); /* interpolate in z */
}

float turbulence_perlin(float *point, float lofreq, float hifreq)
{
	float freq, t, p[3];

	p[0] = point[0] + 123.456;
	p[1] = point[1];
	p[2] = point[2];

	t = 0;
	for (freq = lofreq ; freq < hifreq ; freq *= 2.) {
		t += fabs(noise3_perlin(p)) / freq;
		p[0] *= 2.;
		p[1] *= 2.;
		p[2] *= 2.;
	}
	return t - 0.3; /* readjust to make mean value = 0.0 */
}

/* for use with BLI_gNoise/gTurbulence, returns signed noise */
static float orgPerlinNoise(float x, float y, float z)
{
	float v[3];

	v[0] = x;
	v[1] = y;
	v[2] = z;
	return noise3_perlin(v);
}

/* for use with BLI_gNoise/gTurbulence, returns unsigned noise */
static float orgPerlinNoiseU(float x, float y, float z)
{
	float v[3];

	v[0] = x;
	v[1] = y;
	v[2] = z;
	return (0.5+0.5*noise3_perlin(v));
}

/* *************** CALL AS: *************** */

float BLI_hnoisep(float noisesize, float x, float y, float z)
{
	float vec[3];

	vec[0]= x/noisesize;
	vec[1]= y/noisesize;
	vec[2]= z/noisesize;

	return noise3_perlin(vec);
}

float turbulencep(float noisesize, float x, float y, float z, int nr)
{
	float vec[3];

	vec[0]= x/noisesize;
	vec[1]= y/noisesize;
	vec[2]= z/noisesize;
	nr++;
	return turbulence_perlin(vec, 1.0, (float)(1<<nr));
}

/******************/
/* VORONOI/WORLEY */
/******************/

/* distance metrics for voronoi, e parameter only used in Minkovsky */
/* Camberra omitted, didn't seem useful */

/* distance squared */
static float dist_Squared(float x, float y, float z, float e) { return (x*x + y*y + z*z); }
/* real distance */
static float dist_Real(float x, float y, float z, float e) { return sqrt(x*x + y*y + z*z); }
/* manhattan/taxicab/cityblock distance */
static float dist_Manhattan(float x, float y, float z, float e) { return (fabs(x) + fabs(y) + fabs(z)); }
/* Chebychev */
static float dist_Chebychev(float x, float y, float z, float e)
{
	float t;
	x = fabs(x);
	y = fabs(y);
	z = fabs(z);
	t = (x>y)?x:y;
	return ((z>t)?z:t);
}

/* minkovsky preset exponent 0.5 */
static float dist_MinkovskyH(float x, float y, float z, float e)
{
	float d = sqrt(fabs(x)) + sqrt(fabs(y)) + sqrt(fabs(z));
	return (d*d);
}

/* minkovsky preset exponent 4 */
static float dist_Minkovsky4(float x, float y, float z, float e)
{
	x *= x;
	y *= y;
	z *= z;
	return sqrt(sqrt(x*x + y*y + z*z));
}

/* Minkovsky, general case, slow, maybe too slow to be useful */
static float dist_Minkovsky(float x, float y, float z, float e)
{
 return pow(pow(fabs(x), e) + pow(fabs(y), e) + pow(fabs(z), e), 1.0/e);
}


/* Not 'pure' Worley, but the results are virtually the same.
	 Returns distances in da and point coords in pa */
void voronoi(float x, float y, float z, float* da, float* pa, float me, int dtype)
{
	int xx, yy, zz, xi, yi, zi;
	float xd, yd, zd, d, *p;

	float (*distfunc)(float, float, float, float);
	switch (dtype) {
		case 1:
			distfunc = dist_Squared;
			break;
		case 2:
			distfunc = dist_Manhattan;
			break;
		case 3:
			distfunc = dist_Chebychev;
			break;
		case 4:
			distfunc = dist_MinkovskyH;
			break;
		case 5:
			distfunc = dist_Minkovsky4;
			break;
		case 6:
			distfunc = dist_Minkovsky;
			break;
		case 0:
		default:
			distfunc = dist_Real;
	}

	xi = (int)(floor(x));
	yi = (int)(floor(y));
	zi = (int)(floor(z));
	da[0] = da[1] = da[2] = da[3] = 1e10f;
	for (xx=xi-1;xx<=xi+1;xx++) {
		for (yy=yi-1;yy<=yi+1;yy++) {
			for (zz=zi-1;zz<=zi+1;zz++) {
				p = HASHPNT(xx, yy, zz);
				xd = x - (p[0] + xx);
				yd = y - (p[1] + yy);
				zd = z - (p[2] + zz);
				d = distfunc(xd, yd, zd, me);
				if (d<da[0]) {
					da[3]=da[2];  da[2]=da[1];  da[1]=da[0];  da[0]=d;
					pa[9]=pa[6];  pa[10]=pa[7];  pa[11]=pa[8];
					pa[6]=pa[3];  pa[7]=pa[4];  pa[8]=pa[5];
					pa[3]=pa[0];  pa[4]=pa[1];  pa[5]=pa[2];
					pa[0]=p[0]+xx;  pa[1]=p[1]+yy;  pa[2]=p[2]+zz;
				}
				else if (d<da[1]) {
					da[3]=da[2];  da[2]=da[1];  da[1]=d;
					pa[9]=pa[6];  pa[10]=pa[7];  pa[11]=pa[8];
					pa[6]=pa[3];  pa[7]=pa[4];  pa[8]=pa[5];
					pa[3]=p[0]+xx;  pa[4]=p[1]+yy;  pa[5]=p[2]+zz;
				}
				else if (d<da[2]) {
					da[3]=da[2];  da[2]=d;
					pa[9]=pa[6];  pa[10]=pa[7];  pa[11]=pa[8];
					pa[6]=p[0]+xx;  pa[7]=p[1]+yy;  pa[8]=p[2]+zz;
				}
				else if (d<da[3]) {
					da[3]=d;
					pa[9]=p[0]+xx;  pa[10]=p[1]+yy;  pa[11]=p[2]+zz;
				}
			}
		}
	}
}

/* returns different feature points for use in BLI_gNoise() */
static float voronoi_F1(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return da[0];
}

static float voronoi_F2(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return da[1];
}

static float voronoi_F3(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return da[2];
}

static float voronoi_F4(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return da[3];
}

static float voronoi_F1F2(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (da[1]-da[0]);
}

/* Crackle type pattern, just a scale/clamp of F2-F1 */
static float voronoi_Cr(float x, float y, float z)
{
	float t = 10*voronoi_F1F2(x, y, z);
	if (t>1.f) return 1.f;
	return t;
}


/* Signed version of all 6 of the above, just 2x-1, not really correct though (range is potentially (0, sqrt(6)).
   Used in the musgrave functions */
static float voronoi_F1S(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (2.0*da[0]-1.0);
}

static float voronoi_F2S(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (2.0*da[1]-1.0);
}

static float voronoi_F3S(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (2.0*da[2]-1.0);
}

static float voronoi_F4S(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (2.0*da[3]-1.0);
}

static float voronoi_F1F2S(float x, float y, float z)
{
	float da[4], pa[12];
	voronoi(x, y, z, da, pa, 1, 0);
	return (2.0*(da[1]-da[0])-1.0);
}

/* Crackle type pattern, just a scale/clamp of F2-F1 */
static float voronoi_CrS(float x, float y, float z)
{
	float t = 10*voronoi_F1F2(x, y, z);
	if (t>1.f) return 1.f;
	return (2.0*t-1.0);
}


/***************/
/* voronoi end */
/***************/

/*************/
/* CELLNOISE */
/*************/

/* returns unsigned cellnoise */
static float cellNoiseU(float x, float y, float z)
{
  int xi = (int)(floor(x));
  int yi = (int)(floor(y));
  int zi = (int)(floor(z));
  unsigned int n = xi + yi*1301 + zi*314159;
  n ^= (n<<13);
  return ((float)(n*(n*n*15731 + 789221) + 1376312589) / 4294967296.0);
}

/* idem, signed */
float cellNoise(float x, float y, float z)
{
  return (2.0*cellNoiseU(x, y, z)-1.0);
}

/* returns a vector/point/color in ca, using point hasharray directly */
void cellNoiseV(float x, float y, float z, float *ca)
{
	int xi = (int)(floor(x));
	int yi = (int)(floor(y));
	int zi = (int)(floor(z));
	float *p = HASHPNT(xi, yi, zi);
	ca[0] = p[0];
	ca[1] = p[1];
	ca[2] = p[2];
}


/*****************/
/* end cellnoise */
/*****************/

/* newnoise: generic noise function for use with different noisebases */
float BLI_gNoise(float noisesize, float x, float y, float z, int hard, int noisebasis)
{
	float (*noisefunc)(float, float, float);

	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoiseU;
			break;
		case 2:
			noisefunc = newPerlinU;
			break;
		case 3:
			noisefunc = voronoi_F1;
			break;
		case 4:
			noisefunc = voronoi_F2;
			break;
		case 5:
			noisefunc = voronoi_F3;
			break;
		case 6:
			noisefunc = voronoi_F4;
			break;
		case 7:
			noisefunc = voronoi_F1F2;
			break;
		case 8:
			noisefunc = voronoi_Cr;
			break;
		case 14:
			noisefunc = cellNoiseU;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoise;
			/* add one to make return value same as BLI_hnoise */
			x += 1;
			y += 1;
			z += 1;
		}
	}

	if (noisesize!=0.0) {
		noisesize = 1.0/noisesize;
		x *= noisesize;
		y *= noisesize;
		z *= noisesize;
	}
	
	if (hard) return fabs(2.0*noisefunc(x, y, z)-1.0);
	return noisefunc(x, y, z);
}

/* newnoise: generic turbulence function for use with different noisebasis */
float BLI_gTurbulence(float noisesize, float x, float y, float z, int oct, int hard, int noisebasis)
{
	float (*noisefunc)(float, float, float);
	float sum, t, amp=1, fscale=1;
	int i;
	
	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoiseU;
			break;
		case 2:
			noisefunc = newPerlinU;
			break;
		case 3:
			noisefunc = voronoi_F1;
			break;
		case 4:
			noisefunc = voronoi_F2;
			break;
		case 5:
			noisefunc = voronoi_F3;
			break;
		case 6:
			noisefunc = voronoi_F4;
			break;
		case 7:
			noisefunc = voronoi_F1F2;
			break;
		case 8:
			noisefunc = voronoi_Cr;
			break;
		case 14:
			noisefunc = cellNoiseU;
			break;
		case 0:
		default:
			noisefunc = orgBlenderNoise;
			x += 1;
			y += 1;
			z += 1;
	}

	if (noisesize!=0.0) {
		noisesize = 1.0/noisesize;
		x *= noisesize;
		y *= noisesize;
		z *= noisesize;
	}

	sum = 0;
	for (i=0;i<=oct;i++, amp*=0.5, fscale*=2) {
		t = noisefunc(fscale*x, fscale*y, fscale*z);
		if (hard) t = fabs(2.0*t-1.0);
		sum += t * amp;
	}
	
	sum *= ((float)(1<<oct)/(float)((1<<(oct+1))-1));

	return sum;

}


/*
 * The following code is based on Ken Musgrave's explanations and sample
 * source code in the book "Texturing and Modelling: A procedural approach"
 */

/*
 * Procedural fBm evaluated at "point"; returns value stored in "value".
 *
 * Parameters:
 *    ``H''  is the fractal increment parameter
 *    ``lacunarity''  is the gap between successive frequencies
 *    ``octaves''  is the number of frequencies in the fBm
 */
float mg_fBm(float x, float y, float z, float H, float lacunarity, float octaves, int noisebasis)
{
	float	rmd, value=0.0, pwr=1.0, pwHL=pow(lacunarity, -H);
	int	i;

	float (*noisefunc)(float, float, float);
	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoise;
			break;
		case 2:
			noisefunc = newPerlin;
			break;
		case 3:
			noisefunc = voronoi_F1S;
			break;
		case 4:
			noisefunc = voronoi_F2S;
			break;
		case 5:
			noisefunc = voronoi_F3S;
			break;
		case 6:
			noisefunc = voronoi_F4S;
			break;
		case 7:
			noisefunc = voronoi_F1F2S;
			break;
		case 8:
			noisefunc = voronoi_CrS;
			break;
		case 14:
			noisefunc = cellNoise;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoiseS;
		}
	}
	
	for (i=0; i<(int)octaves; i++) {
		value += noisefunc(x, y, z) * pwr;
		pwr *= pwHL;
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
	}

	rmd = octaves - floor(octaves);
	if (rmd!=0.f) value += rmd * noisefunc(x, y, z) * pwr;

	return value;

} /* fBm() */


/*
 * Procedural multifractal evaluated at "point";
 * returns value stored in "value".
 *
 * Parameters:
 *    ``H''  determines the highest fractal dimension
 *    ``lacunarity''  is gap between successive frequencies
 *    ``octaves''  is the number of frequencies in the fBm
 *    ``offset''  is the zero offset, which determines multifractality (NOT USED??)
 */
 /* this one is in fact rather confusing,
 	* there seem to be errors in the original source code (in all three versions of proc.text&mod),
	* I modified it to something that made sense to me, so it might be wrong... */
float mg_MultiFractal(float x, float y, float z, float H, float lacunarity, float octaves, int noisebasis)
{
	float	rmd, value=1.0, pwr=1.0, pwHL=pow(lacunarity, -H);
	int i;
	
	float (*noisefunc)(float, float, float);
	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoise;
			break;
		case 2:
			noisefunc = newPerlin;
			break;
		case 3:
			noisefunc = voronoi_F1S;
			break;
		case 4:
			noisefunc = voronoi_F2S;
			break;
		case 5:
			noisefunc = voronoi_F3S;
			break;
		case 6:
			noisefunc = voronoi_F4S;
			break;
		case 7:
			noisefunc = voronoi_F1F2S;
			break;
		case 8:
			noisefunc = voronoi_CrS;
			break;
		case 14:
			noisefunc = cellNoise;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoiseS;
		}
	}

	for (i=0; i<(int)octaves; i++) {
		value *= (pwr * noisefunc(x, y, z) + 1.0);
		pwr *= pwHL;
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
	}
	rmd = octaves - floor(octaves);
	if (rmd!=0.0) value *= (rmd * noisefunc(x, y, z) * pwr + 1.0);

	return value;

} /* multifractal() */

/*
 * Heterogeneous procedural terrain function: stats by altitude method.
 * Evaluated at "point"; returns value stored in "value".
 *
 * Parameters:
 *       ``H''  determines the fractal dimension of the roughest areas
 *       ``lacunarity''  is the gap between successive frequencies
 *       ``octaves''  is the number of frequencies in the fBm
 *       ``offset''  raises the terrain from `sea level'
 */
float mg_HeteroTerrain(float x, float y, float z, float H, float lacunarity, float octaves, float offset, int noisebasis)
{
	float	value, increment, rmd;
	int i;
	float pwHL = pow(lacunarity, -H);
	float pwr = pwHL;	/* starts with i=1 instead of 0 */

	float (*noisefunc)(float, float, float);
	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoise;
			break;
		case 2:
			noisefunc = newPerlin;
			break;
		case 3:
			noisefunc = voronoi_F1S;
			break;
		case 4:
			noisefunc = voronoi_F2S;
			break;
		case 5:
			noisefunc = voronoi_F3S;
			break;
		case 6:
			noisefunc = voronoi_F4S;
			break;
		case 7:
			noisefunc = voronoi_F1F2S;
			break;
		case 8:
			noisefunc = voronoi_CrS;
			break;
		case 14:
			noisefunc = cellNoise;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoiseS;
		}
	}

	/* first unscaled octave of function; later octaves are scaled */
	value = offset + noisefunc(x, y, z);
	x *= lacunarity;
	y *= lacunarity;
	z *= lacunarity;

	for (i=1; i<(int)octaves; i++) {
		increment = (noisefunc(x, y, z) + offset) * pwr * value;
		value += increment;
		pwr *= pwHL;
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
	}

	rmd = octaves - floor(octaves);
	if (rmd!=0.0) {
		increment = (noisefunc(x, y, z) + offset) * pwr * value;
		value += rmd * increment;
	}
	return value;
}


/* Hybrid additive/multiplicative multifractal terrain model.
 *
 * Some good parameter values to start with:
 *
 *      H:           0.25
 *      offset:      0.7
 */
float mg_HybridMultiFractal(float x, float y, float z, float H, float lacunarity, float octaves, float offset, float gain, int noisebasis)
{
	float result, signal, weight, rmd;
	int i;
	float pwHL = pow(lacunarity, -H);
	float pwr = pwHL;	/* starts with i=1 instead of 0 */
	float (*noisefunc)(float, float, float);

	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoise;
			break;
		case 2:
			noisefunc = newPerlin;
			break;
		case 3:
			noisefunc = voronoi_F1S;
			break;
		case 4:
			noisefunc = voronoi_F2S;
			break;
		case 5:
			noisefunc = voronoi_F3S;
			break;
		case 6:
			noisefunc = voronoi_F4S;
			break;
		case 7:
			noisefunc = voronoi_F1F2S;
			break;
		case 8:
			noisefunc = voronoi_CrS;
			break;
		case 14:
			noisefunc = cellNoise;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoiseS;
		}
	}

	result = noisefunc(x, y, z) + offset;
	weight = gain * result;
	x *= lacunarity;
	y *= lacunarity;
	z *= lacunarity;

	for (i=1; (weight>0.001) && (i<(int)octaves); i++) {
		if (weight>1.0)  weight=1.0;
		signal = (noisefunc(x, y, z) + offset) * pwr;
		pwr *= pwHL;
		result += weight * signal;
		weight *= gain * signal;
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
	}

	rmd = octaves - floor(octaves);
	if (rmd!=0.f) result += rmd * ((noisefunc(x, y, z) + offset) * pwr);

	return result;

} /* HybridMultifractal() */


/* Ridged multifractal terrain model.
 *
 * Some good parameter values to start with:
 *
 *      H:           1.0
 *      offset:      1.0
 *      gain:        2.0
 */
float mg_RidgedMultiFractal(float x, float y, float z, float H, float lacunarity, float octaves, float offset, float gain, int noisebasis)
{
	float result, signal, weight;
	int	i;
	float pwHL = pow(lacunarity, -H);
	float pwr = pwHL;	/* starts with i=1 instead of 0 */
	
	float (*noisefunc)(float, float, float);
	switch (noisebasis) {
		case 1:
			noisefunc = orgPerlinNoise;
			break;
		case 2:
			noisefunc = newPerlin;
			break;
		case 3:
			noisefunc = voronoi_F1S;
			break;
		case 4:
			noisefunc = voronoi_F2S;
			break;
		case 5:
			noisefunc = voronoi_F3S;
			break;
		case 6:
			noisefunc = voronoi_F4S;
			break;
		case 7:
			noisefunc = voronoi_F1F2S;
			break;
		case 8:
			noisefunc = voronoi_CrS;
			break;
		case 14:
			noisefunc = cellNoise;
			break;
		case 0:
		default: {
			noisefunc = orgBlenderNoiseS;
		}
	}

	signal = offset - fabs(noisefunc(x, y, z));
	signal *= signal;
	result = signal;
	weight = 1.f;

	for( i=1; i<(int)octaves; i++ ) {
		x *= lacunarity;
		y *= lacunarity;
		z *= lacunarity;
		weight = signal * gain;
		if (weight>1.0) weight=1.0; else if (weight<0.0) weight=0.0;
		signal = offset - fabs(noisefunc(x, y, z));
		signal *= signal;
		signal *= weight;
		result += signal * pwr;
		pwr *= pwHL;
	}

	return result;
} /* RidgedMultifractal() */

/* "Variable Lacunarity Noise"
 * A distorted variety of Perlin noise.
 */
float mg_VLNoise(float x, float y, float z, float distortion, int nbas1, int nbas2)
{
	float rv[3];
	float (*noisefunc1)(float, float, float);
	float (*noisefunc2)(float, float, float);

	switch (nbas1) {
		case 1:
			noisefunc1 = orgPerlinNoise;
			break;
		case 2:
			noisefunc1 = newPerlin;
			break;
		case 3:
			noisefunc1 = voronoi_F1S;
			break;
		case 4:
			noisefunc1 = voronoi_F2S;
			break;
		case 5:
			noisefunc1 = voronoi_F3S;
			break;
		case 6:
			noisefunc1 = voronoi_F4S;
			break;
		case 7:
			noisefunc1 = voronoi_F1F2S;
			break;
		case 8:
			noisefunc1 = voronoi_CrS;
			break;
		case 14:
			noisefunc1 = cellNoise;
			break;
		case 0:
		default: {
			noisefunc1 = orgBlenderNoiseS;
		}
	}

	switch (nbas2) {
		case 1:
			noisefunc2 = orgPerlinNoise;
			break;
		case 2:
			noisefunc2 = newPerlin;
			break;
		case 3:
			noisefunc2 = voronoi_F1S;
			break;
		case 4:
			noisefunc2 = voronoi_F2S;
			break;
		case 5:
			noisefunc2 = voronoi_F3S;
			break;
		case 6:
			noisefunc2 = voronoi_F4S;
			break;
		case 7:
			noisefunc2 = voronoi_F1F2S;
			break;
		case 8:
			noisefunc2 = voronoi_CrS;
			break;
		case 14:
			noisefunc2 = cellNoise;
			break;
		case 0:
		default: {
			noisefunc2 = orgBlenderNoiseS;
		}
	}

	/* get a random vector and scale the randomization */
	rv[0] = noisefunc1(x+13.5, y+13.5, z+13.5) * distortion;
	rv[1] = noisefunc1(x, y, z) * distortion;
	rv[2] = noisefunc1(x-13.5, y-13.5, z-13.5) * distortion;
	return noisefunc2(x+rv[0], y+rv[1], z+rv[2]);	/* distorted-domain noise */
}

/****************/
/* musgrave end */
/****************/