| 1 | /* |
1 | /* |
| 2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
2 | * This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 | * |
3 | * |
| 4 | * Copyright (©) 2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
4 | * Copyright (©) 2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 | * |
5 | * |
| 6 | * Deliantra is free software: you can redistribute it and/or modify it under |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
| 7 | * the terms of the Affero GNU General Public License as published by the |
7 | * the terms of the Affero GNU General Public License as published by the |
| 8 | * Free Software Foundation, either version 3 of the License, or (at your |
8 | * Free Software Foundation, either version 3 of the License, or (at your |
| 9 | * option) any later version. |
9 | * option) any later version. |
| … | |
… | |
| 22 | |
22 | |
| 23 | #include "noise.h" |
23 | #include "noise.h" |
| 24 | |
24 | |
| 25 | ///////////////////////////////////////////////////////////////////////////// |
25 | ///////////////////////////////////////////////////////////////////////////// |
| 26 | |
26 | |
|
|
27 | // http://www-wales.ch.cam.ac.uk/~wales/CCD/Thomson/table.html, random permutation |
|
|
28 | // used as gradient vectors for noise3d |
|
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29 | static const float charges[256][3] = { |
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30 | 6.32096444e-01, -6.11406706e-01, 4.76062943e-01, 5.19172442e-01, 8.08229585e-01, -2.77893708e-01, |
|
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31 | -8.81072422e-01, -4.68301230e-01, 6.63727731e-02, -1.92122323e-01, 9.81341519e-01, -7.60505942e-03, |
|
|
32 | -2.57478265e-01, 9.34157733e-01, -2.47091628e-01, 8.75501090e-01, -1.48087600e-01, -4.59965112e-01, |
|
|
33 | -6.44086082e-01, 3.21868600e-01, 6.93940720e-01, -4.42053435e-01, -1.94962529e-01, -8.75544615e-01, |
|
|
34 | -6.86776297e-01, 5.34610386e-01, -4.92473403e-01, -8.45541961e-01, -2.41708225e-01, 4.76062943e-01, |
|
|
35 | 1.87301993e-01, 3.04913657e-01, 9.33780287e-01, -8.21274139e-01, 4.76841979e-01, -3.13257905e-01, |
|
|
36 | 1.82393582e-01, 9.78673695e-01, -9.45006918e-02, -5.13996405e-01, 5.64894294e-01, -6.45524695e-01, |
|
|
37 | -2.85987088e-01, -5.27238900e-01, -8.00144067e-01, 3.72992508e-01, 8.73495087e-01, 3.12862464e-01, |
|
|
38 | 3.07149790e-02, -1.36108589e-01, 9.90217674e-01, -9.42965190e-01, -1.13726556e-01, 3.12862464e-01, |
|
|
39 | -7.63495246e-01, -8.89713729e-02, -6.39655457e-01, -4.93181655e-01, 3.84537051e-01, -7.80322441e-01, |
|
|
40 | 9.59053138e-01, -6.07981062e-03, -2.83160934e-01, 8.47504655e-02, 6.82510620e-01, -7.25945323e-01, |
|
|
41 | 2.72233465e-01, 7.06503091e-01, 6.53255175e-01, -6.69781595e-01, 6.75521448e-01, -3.08323512e-01, |
|
|
42 | -9.83646297e-01, 1.64266522e-01, -7.38679386e-02, -1.33230986e-01, 4.14543427e-02, 9.90217674e-01, |
|
|
43 | -9.68112521e-01, -2.24691711e-01, 1.10778074e-01, 2.60286884e-01, 5.44444585e-01, -7.97390012e-01, |
|
|
44 | -9.59533574e-01, 4.55017306e-02, -2.77893708e-01, 6.34082129e-01, 7.69729420e-01, -7.38679387e-02, |
|
|
45 | 8.71590956e-01, -4.57032412e-01, -1.77343115e-01, -5.65998169e-01, -6.84162385e-01, -4.59965112e-01, |
|
|
46 | 1.31348131e-01, -9.34573215e-01, 3.30636620e-01, 9.37743461e-01, -2.44096148e-01, -2.47091628e-01, |
|
|
47 | -2.32019785e-03, -9.49665258e-01, -3.13257905e-01, 5.58257270e-01, -6.92564967e-01, -4.56839782e-01, |
|
|
48 | 5.79609682e-01, 2.34839316e-01, -7.80322441e-01, 5.21842141e-02, 4.80310769e-01, -8.75544615e-01, |
|
|
49 | 5.48696303e-01, -4.14651366e-01, -7.25945323e-01, -5.13713359e-02, -3.67059868e-01, 9.28777712e-01, |
|
|
50 | -8.31597157e-01, -5.26303703e-01, -1.77343115e-01, 7.60006362e-01, -6.75440951e-02, -6.46396260e-01, |
|
|
51 | -6.35840799e-01, -7.53287574e-01, 1.68119925e-01, 6.00789426e-01, 3.96860609e-01, 6.93940720e-01, |
|
|
52 | -3.99937982e-02, 9.83336115e-01, -1.77343115e-01, -4.74261299e-01, 8.33604286e-01, -2.83160934e-01, |
|
|
53 | 8.74744319e-01, 8.54351386e-02, -4.76993934e-01, 2.64896284e-01, -6.69736874e-01, 6.93745254e-01, |
|
|
54 | -2.24976555e-01, -1.01696579e-01, -9.69042494e-01, 6.08580404e-01, -2.06649545e-01, 7.66110865e-01, |
|
|
55 | -2.32214607e-01, -7.27581091e-01, -6.45524695e-01, -1.14732673e-01, 7.81826288e-01, -6.12849141e-01, |
|
|
56 | -5.46171508e-01, 5.27060305e-01, 6.51079195e-01, 1.70411976e-01, -3.14665113e-01, 9.33780287e-01, |
|
|
57 | -1.14827108e-01, 9.66494440e-01, 2.29571847e-01, 6.62214703e-01, -4.23664923e-01, 6.18045079e-01, |
|
|
58 | 3.43568839e-01, 1.39041052e-01, 9.28777712e-01, 2.65015805e-01, 5.00565290e-01, 8.24136526e-01, |
|
|
59 | -4.26259648e-01, -7.20031380e-01, 5.47592480e-01, 7.57191364e-01, -5.91945814e-01, 2.76154652e-01, |
|
|
60 | 9.94315593e-01, 4.60290452e-02, 9.60095232e-02, 9.70286575e-01, -1.74010497e-01, 1.68119925e-01, |
|
|
61 | 1.34044431e-01, 9.51719864e-01, 2.76154652e-01, -3.21508279e-01, 6.91956864e-01, -6.46396261e-01, |
|
|
62 | -9.15927355e-01, 3.90047734e-01, -9.45507570e-02, -3.57713970e-01, 9.75145600e-03, 9.33780287e-01, |
|
|
63 | 4.58799092e-01, -6.16720593e-01, -6.39655457e-01, -4.06287592e-01, 9.10837959e-01, -7.28327195e-02, |
|
|
64 | 7.69084079e-01, -2.21547533e-01, 5.99521785e-01, 4.32966564e-02, -7.18729210e-01, 6.93940720e-01, |
|
|
65 | 7.91803580e-01, -4.28020920e-01, 4.35712270e-01, 3.04696154e-01, 7.05691965e-01, -6.39655457e-01, |
|
|
66 | 6.46420856e-01, 4.00281039e-01, -6.49549973e-01, 8.31864266e-01, -3.69542234e-01, -4.14053595e-01, |
|
|
67 | 8.23594337e-01, 4.72823279e-01, -3.13257905e-01, -5.85665015e-01, -8.07274355e-01, -7.28327193e-02, |
|
|
68 | -5.65385161e-02, -4.32158277e-01, -9.00023678e-01, 2.06686552e-01, -8.22754465e-01, 5.29486316e-01, |
|
|
69 | 8.65928642e-01, 3.96271834e-01, 3.05182275e-01, 1.87431189e-02, 4.56064322e-01, 8.89749419e-01, |
|
|
70 | -5.94715001e-01, -2.32669312e-01, 7.69531714e-01, 5.99595825e-01, 1.59473663e-02, -8.00144067e-01, |
|
|
71 | 9.58599657e-02, 6.31372955e-01, 7.69531714e-01, 3.20650220e-01, 8.29747462e-01, -4.56839782e-01, |
|
|
72 | -3.13608737e-01, 5.11291534e-01, -8.00144067e-01, -8.67906788e-01, 4.85339988e-01, 1.05749252e-01, |
|
|
73 | 3.22455909e-01, 9.12507983e-01, -2.51696976e-01, 5.15563696e-01, 7.07202113e-01, -4.83796700e-01, |
|
|
74 | 7.50491607e-01, -5.66571271e-01, -3.40234247e-01, -2.58299208e-01, -3.23551155e-01, -9.10272580e-01, |
|
|
75 | 3.49564167e-01, -9.33995942e-01, -7.38679386e-02, 4.02529304e-01, 1.67115347e-01, -9.00023678e-01, |
|
|
76 | 9.45927846e-01, -3.24287947e-01, -7.60505937e-03, -4.04334848e-01, -2.11800144e-01, 8.89749419e-01, |
|
|
77 | 3.41359400e-01, -4.97637347e-01, -7.97390012e-01, 7.43690080e-01, 5.81037425e-01, 3.30636620e-01, |
|
|
78 | -8.15869544e-01, 2.32381428e-01, 5.29486316e-01, -2.73993936e-01, -4.03941386e-01, 8.72787878e-01, |
|
|
79 | -1.14485896e-01, -9.85759380e-01, -1.23172337e-01, -6.69863977e-01, 3.59676363e-01, -6.49549972e-01, |
|
|
80 | -7.96449717e-01, 5.92027384e-01, -1.23172337e-01, -6.19715090e-01, -4.90274553e-01, -6.12849141e-01, |
|
|
81 | -8.65910917e-01, -3.66659161e-01, -3.40234247e-01, 8.46096973e-01, -5.28880485e-01, 6.63727731e-02, |
|
|
82 | -8.91235794e-01, -3.59774050e-01, 2.76154652e-01, 4.20417732e-01, 3.46935142e-01, 8.38382334e-01, |
|
|
83 | -6.38459078e-01, 7.23512413e-01, 2.62487703e-01, -7.53805524e-01, -6.57053571e-01, -7.60505938e-03, |
|
|
84 | 4.47561005e-01, 5.64275348e-01, 6.93745254e-01, 3.49754488e-02, 9.97181715e-01, 6.63727730e-02, |
|
|
85 | -1.28749619e-01, -5.72643486e-01, 8.09631381e-01, -6.36032129e-01, -6.58092804e-01, 4.02960285e-01, |
|
|
86 | -5.37020119e-01, 8.38088040e-01, 9.60095232e-02, -8.78907490e-01, -1.37182495e-01, -4.56839782e-01, |
|
|
87 | -9.33228374e-01, 1.34065997e-01, 3.33333333e-01, 6.80411181e-01, 5.47277055e-01, -4.87368906e-01, |
|
|
88 | -7.12457289e-01, 1.05461526e-01, 6.93745254e-01, 2.30586085e-01, 3.30051738e-01, -9.15366543e-01, |
|
|
89 | 2.34431211e-02, -7.59957402e-01, -6.49549973e-01, -6.98011937e-01, -3.61662294e-01, 6.18045079e-01, |
|
|
90 | 8.59171516e-01, 2.05105173e-01, 4.68781584e-01, 7.11862181e-01, 6.90797320e-01, 1.26693714e-01, |
|
|
91 | -2.12826534e-01, 4.39256402e-01, 8.72787878e-01, -3.62298594e-01, -9.25543476e-01, -1.10040912e-01, |
|
|
92 | -3.63383159e-01, -8.00268371e-01, -4.76993934e-01, -7.76145796e-01, 5.51780285e-01, 3.05182275e-01, |
|
|
93 | -1.92676248e-01, 7.76820116e-01, 5.99521785e-01, -9.19690664e-01, 2.65359911e-01, -2.89401453e-01, |
|
|
94 | -2.52247996e-02, 8.99732475e-01, 4.35712270e-01, 7.52676085e-01, 4.12472645e-01, 5.13171539e-01, |
|
|
95 | -1.19598027e-01, -8.62070913e-01, -4.92473403e-01, 9.40191063e-01, -1.58443230e-02, 3.40278890e-01, |
|
|
96 | -9.89903836e-01, 3.37653035e-02, 1.37660085e-01, 3.00994355e-01, -4.79793064e-01, 8.24136526e-01, |
|
|
97 | 4.35219899e-01, 8.98427220e-01, -5.84137724e-02, -9.54179119e-01, 2.71092073e-01, 1.26693714e-01, |
|
|
98 | 9.02457799e-02, -5.37560007e-01, 8.38382334e-01, -9.58991702e-02, 9.05186704e-01, -4.14053596e-01, |
|
|
99 | -8.97828463e-02, -9.48052118e-01, 3.05182275e-01, -7.79595183e-01, -5.82690413e-01, 2.29571847e-01, |
|
|
100 | -6.01646284e-01, -4.68072388e-02, -7.97390012e-01, -6.80265196e-01, -6.90061585e-01, -2.47091628e-01, |
|
|
101 | 6.89653756e-01, 6.63795523e-01, -2.89401453e-01, -7.35965096e-01, -5.35644470e-01, -4.14053595e-01, |
|
|
102 | -4.83817118e-01, -8.06307183e-01, 3.40278890e-01, -2.51959468e-01, -8.46616946e-01, 4.68781584e-01, |
|
|
103 | 2.89467531e-01, 9.50755892e-01, 1.10778074e-01, -4.31548997e-01, 3.97822184e-01, 8.09631381e-01, |
|
|
104 | 1.03460411e-01, 8.29768433e-01, -5.48434400e-01, -7.70330748e-01, -3.25284873e-01, -5.48434400e-01, |
|
|
105 | 4.75732892e-01, -5.89012642e-01, 6.53255175e-01, -4.56373945e-01, 8.22151506e-01, 3.40278890e-01, |
|
|
106 | -7.47966357e-01, -1.17490449e-01, 6.53255175e-01, -4.84791839e-01, -8.27524476e-01, -2.83160934e-01, |
|
|
107 | -8.75038211e-01, 3.53535790e-01, 3.30636620e-01, 4.09353123e-01, -6.19180984e-02, -9.10272580e-01, |
|
|
108 | -9.95670746e-01, -7.23021212e-02, -5.84137724e-02, -4.57295474e-01, -8.84117086e-01, 9.60095233e-02, |
|
|
109 | -8.64280276e-02, -6.19376367e-01, -7.80322441e-01, 2.44164564e-02, 2.45683701e-01, -9.69042494e-01, |
|
|
110 | 8.94422292e-01, -3.83804027e-01, 2.29571847e-01, -8.62566691e-01, 4.52816156e-03, 5.05923116e-01, |
|
|
111 | 9.19909533e-01, 2.42287152e-01, -3.08323512e-01, -4.01126232e-01, 3.46675383e-02, -9.15366543e-01, |
|
|
112 | 9.51367455e-01, 2.99880902e-01, 7.05082324e-02, -5.61852646e-01, 1.73058019e-01, -8.08932956e-01, |
|
|
113 | 5.60450847e-01, -8.26125099e-01, -5.84137724e-02, -4.83253958e-01, -4.23721318e-01, 7.66110865e-01, |
|
|
114 | -1.91262533e-02, -8.58072933e-01, 5.13171539e-01, 4.27361843e-01, -7.49268748e-01, 5.05923116e-01, |
|
|
115 | 8.06374324e-01, 3.27460527e-01, -4.92473403e-01, -3.49075205e-01, -5.94876216e-01, 7.24064077e-01, |
|
|
116 | 1.70540147e-01, -3.64719277e-01, -9.15366543e-01, -9.51483049e-01, -1.76998983e-01, -2.51696976e-01, |
|
|
117 | -3.34445776e-01, 9.27298072e-01, 1.68119925e-01, -2.58769450e-02, -2.24111854e-01, -9.74219821e-01, |
|
|
118 | 3.50509628e-01, -8.75232478e-01, 3.33333333e-01, -5.11361160e-01, 7.14833233e-01, -4.76993934e-01, |
|
|
119 | 2.13445517e-01, 8.53114931e-01, 4.76062943e-01, -7.35388206e-01, 6.73967933e-01, 7.05082324e-02, |
|
|
120 | -5.10663512e-01, 1.90624866e-01, 8.38382334e-01, 2.07025032e-01, 8.96458354e-02, -9.74219821e-01, |
|
|
121 | 2.30036908e-01, -9.29155434e-01, -2.89401453e-01, -4.38498083e-01, -6.24412769e-01, -6.46396260e-01, |
|
|
122 | 7.56359490e-01, -6.47294323e-01, -9.45006918e-02, -7.33549832e-01, 4.45600288e-01, 5.13171539e-01, |
|
|
123 | 5.69972682e-01, -7.59768531e-01, 3.12862464e-01, 1.36366351e-02, -9.94299320e-01, 1.05749252e-01, |
|
|
124 | -1.20108971e-01, 6.12129242e-01, -7.81582770e-01, -6.20394866e-01, 7.76531524e-01, -1.10040912e-01, |
|
|
125 | 3.85591729e-01, -2.44264178e-01, 8.89749420e-01, -8.14161423e-01, 3.15614840e-01, -4.87368906e-01, |
|
|
126 | 1.15419311e-01, 9.33230432e-01, -3.40234248e-01, 5.90173960e-01, -2.02047201e-01, -7.81582770e-01, |
|
|
127 | 8.54270153e-01, 5.08959332e-01, 1.05749252e-01, 7.95754924e-01, 5.98192490e-01, -9.45507571e-02, |
|
|
128 | 3.54673147e-01, -8.00092315e-01, -4.83796700e-01, 9.91952607e-01, -1.03563604e-01, -7.28327194e-02, |
|
|
129 | -6.21935152e-02, 2.58972647e-01, 9.63880249e-01, -3.09502921e-01, 8.32249985e-01, -4.59965112e-01, |
|
|
130 | 4.65710308e-01, -8.74164521e-01, 1.37660085e-01, 1.33750242e-01, -8.62891895e-01, -4.87368906e-01, |
|
|
131 | -2.51909022e-01, 8.79866384e-01, 4.02960285e-01, -6.67371446e-11, -8.00239945e-11, -1.00000000e+00, |
|
|
132 | -5.76407831e-01, -5.55272584e-01, 5.99521785e-01, -4.70064989e-01, -4.10082041e-01, -7.81582770e-01, |
|
|
133 | 8.36695291e-01, -9.13599363e-03, 5.47592480e-01, 5.24193529e-01, 8.40399218e-01, 1.37660085e-01, |
|
|
134 | 2.48438744e-01, -7.05895175e-01, -6.63317565e-01, 1.20172431e-01, -9.88240224e-01, -9.45507569e-02, |
|
|
135 | 4.30798964e-01, 4.00049655e-01, -8.08932956e-01, -2.50127938e-01, -9.17808600e-01, -3.08323512e-01, |
|
|
136 | 6.09182992e-01, 5.90373037e-01, 5.29486316e-01, -3.40640313e-01, 5.99746104e-01, 7.24064077e-01, |
|
|
137 | 4.40361132e-01, -8.53731316e-01, -2.77893708e-01, -1.83361859e-01, -7.36528553e-01, 6.51079195e-01, |
|
|
138 | 9.82693460e-01, 1.49011952e-01, -1.10040912e-01, 6.29027140e-01, -7.35509000e-01, -2.51696976e-01, |
|
|
139 | -8.70236843e-01, 9.28902018e-02, -4.83796700e-01, 9.45809668e-01, 1.91165575e-01, 2.62487703e-01, |
|
|
140 | 2.00560098e-01, -1.43987122e-01, -9.69042494e-01, 1.02516007e-01, 9.46542469e-02, 9.90217674e-01, |
|
|
141 | -6.07212048e-01, 6.41511773e-01, 4.68781584e-01, 2.42316938e-01, -9.61889393e-01, 1.26693714e-01, |
|
|
142 | 4.87103783e-01, 5.68101851e-01, -6.63317565e-01, -9.38753073e-01, -3.31379371e-01, -9.45006918e-02, |
|
|
143 | 3.89869221e-01, -2.85348240e-01, -8.75544615e-01, -6.33446768e-01, -2.67859254e-01, -7.25945323e-01, |
|
|
144 | 5.82718746e-01, 7.41166481e-01, 3.33333333e-01, 6.66870337e-01, -5.04483561e-01, -5.48434400e-01, |
|
|
145 | 7.34447763e-01, -2.91551734e-01, -6.12849141e-01, 9.10935613e-01, 3.93731996e-01, -1.23172337e-01, |
|
|
146 | 3.57972341e-02, 7.85327217e-01, 6.18045079e-01, -2.92197503e-01, 2.28018816e-01, 9.28777712e-01 |
|
|
147 | -1.93180133e-01, -1.83347487e-01, 9.63880249e-01, -2.15979248e-01, -9.73848835e-01, 7.05082325e-02, |
|
|
148 | 8.87941151e-01, -2.21773580e-01, 4.02960285e-01, 6.89715518e-01, -4.86988739e-03, 7.24064077e-01, |
|
|
149 | -4.10435643e-01, 7.29167374e-01, 5.47592480e-01, 7.46211012e-01, 1.62686797e-01, -6.45524695e-01, |
|
|
150 | -1.81148087e-01, 1.34466019e-01, -9.74219821e-01, -7.66578780e-01, -4.71711555e-01, 4.35712270e-01, |
|
|
151 | -5.66010160e-01, -2.07722258e-02, 8.24136526e-01, 7.29533368e-01, 2.09468249e-01, 6.51079195e-01, |
|
|
152 | -3.45990788e-01, 2.65042929e-01, -9.00023678e-01, -7.35542526e-01, 1.37793324e-01, -6.63317565e-01, |
|
|
153 | -1.25326447e-01, 6.30370863e-01, 7.66110865e-01, 1.31053682e-01, -5.73107674e-01, -8.08932955e-01, |
|
|
154 | 4.86820470e-01, -3.53150162e-02, 8.72787878e-01, 4.35204849e-01, 7.44740586e-01, 5.05923116e-01, |
|
|
155 | 4.98855035e-01, -3.98703643e-01, 7.69531714e-01, 2.55373649e-01, -7.56251592e-02, 9.63880249e-01, |
|
|
156 | -1.51053916e-01, 3.85469253e-01, -9.10272580e-01, 6.78644990e-01, -7.26064181e-01, 1.10778074e-01, |
|
|
157 | -3.07350590e-01, -9.14677987e-01, 2.62487703e-01, 5.60298616e-01, 1.74821302e-01, 8.09631381e-01, |
|
|
158 | }; |
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159 | |
|
|
160 | ///////////////////////////////////////////////////////////////////////////// |
|
|
161 | |
|
|
162 | template<int N, typename T> |
|
|
163 | template<class random_generator> |
|
|
164 | void |
|
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165 | permutation<N,T>::seed (random_generator &rng) |
|
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166 | { |
|
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167 | for (int i = 0; i < N; ++i) |
|
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168 | pmap[i] = i; |
|
|
169 | |
|
|
170 | // fisher-yates to randomly perturb |
|
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171 | for (int i = N; --i; ) |
|
|
172 | ::swap (pmap[i], pmap[rng (i + 1)]); |
|
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173 | } |
|
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174 | |
|
|
175 | template class permutation<256, uint8_t>; |
|
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176 | |
|
|
177 | ///////////////////////////////////////////////////////////////////////////// |
|
|
178 | |
|
|
179 | static vec2d |
|
|
180 | floor (vec2d v) |
|
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181 | { |
|
|
182 | return vec2d (std::floor (v[0]), std::floor (v[1])); |
|
|
183 | } |
|
|
184 | |
|
|
185 | static vec3d |
|
|
186 | floor (vec3d v) |
|
|
187 | { |
|
|
188 | return vec3d (std::floor (v[0]), std::floor (v[1]), std::floor (v[2])); |
|
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189 | } |
|
|
190 | |
| 27 | noise2d::noise2d (uint32_t seed) |
191 | noise_gen<vec2d>::noise_gen (uint32_t seed) |
| 28 | { |
192 | { |
| 29 | seedable_rand_gen rng (seed); |
193 | seedable_rand_gen rng (seed); |
| 30 | |
194 | |
|
|
195 | #if 0 |
| 31 | for (int i = 0; i < 256; ++i) |
196 | for (int i = 0; i < 256; ++i) |
| 32 | { |
197 | { |
| 33 | vec2d rv; |
198 | vec2d rv (rng () - 0.5f, rng () - 0.5f); |
| 34 | rv[0] = rng () - 0.5f; |
|
|
| 35 | rv[1] = rng () - 0.5f; |
|
|
| 36 | |
199 | |
| 37 | // normalise |
200 | // normalise |
| 38 | float mag = 1.f / sqrtf (rv[0] * rv[0] + rv[1] * rv[1]); |
201 | float mag = 1.f / sqrtf (dot (rv, rv)); |
| 39 | |
202 | |
| 40 | rv[0] *= mag; |
203 | rv[0] *= mag; |
| 41 | rv[1] *= mag; |
204 | rv[1] *= mag; |
| 42 | |
205 | |
| 43 | rvec[i][0] = rv[0]; |
206 | rvec[i] = rv; |
| 44 | rvec[i][1] = rv[1]; |
207 | } |
|
|
208 | #endif |
|
|
209 | |
|
|
210 | #if 1 |
|
|
211 | float offset = rng () * M_PI; |
|
|
212 | |
|
|
213 | for (int i = 0; i < 256; ++i) |
| 45 | } |
214 | { |
|
|
215 | float phi = i * (M_PI * 2 / 256) + offset; |
|
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216 | |
|
|
217 | rvec[i][0] = sinf (phi); |
|
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218 | rvec[i][1] = -cosf (phi); |
|
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219 | } |
|
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220 | |
|
|
221 | // fisher-yates to randomly perturb |
|
|
222 | for (int i = 256; --i; ) |
|
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223 | ::swap (rvec [i], rvec [rng (i + 1)]); |
|
|
224 | #endif |
| 46 | |
225 | |
| 47 | rvmap[0].seed (rng); |
226 | rvmap[0].seed (rng); |
| 48 | rvmap[1].seed (rng); |
227 | rvmap[1].seed (rng); |
| 49 | } |
228 | } |
| 50 | |
229 | |
| 51 | float |
230 | vec2d::T_numtype |
| 52 | noise2d::noise (float x, float y) |
231 | noise_gen<vec2d>::operator() (vec2d P) |
| 53 | { |
232 | { |
| 54 | int ix = floorf (x); float fx = x - ix; |
233 | vec2d I = floor (P); |
| 55 | int iy = floorf (y); float fy = y - iy; |
234 | vec2d F = P - I; |
| 56 | |
235 | |
| 57 | float v = 0; |
236 | float v = 0; |
| 58 | |
237 | |
| 59 | for (int j = -1; j <= 2; ++j) |
238 | for (int j = -1; j <= 2; ++j) |
| 60 | for (int i = -1; i <= 2; ++i) |
239 | for (int i = -1; i <= 2; ++i) |
| 61 | { |
240 | { |
| 62 | float Ax = fx - i; |
241 | vec2d A = F - vec2d (i, j); |
| 63 | float Ay = fy - j; |
|
|
| 64 | |
242 | |
| 65 | float d = Ax * Ax + Ay * Ay; |
243 | float d = dot (A, A); |
| 66 | |
244 | |
| 67 | if (d < 4) |
245 | if (d < 4) |
| 68 | { |
246 | { |
| 69 | float t1 = 1 - d / 4; |
247 | float t1 = 1 - d / 4; |
| 70 | float t2 = t1 * t1; |
248 | float t2 = t1 * t1; |
| 71 | float t4 = t2 * t2; |
249 | float t4 = t2 * t2; |
| 72 | |
250 | |
| 73 | float p = (4 * t1 - 3) * t4; |
251 | float p = (4 * t1 - 3) * t4; |
| 74 | |
252 | |
| 75 | int h = rvmap[0](ix + i) ^ rvmap[1](iy + j); |
253 | int h = rvmap [0](I[0] + i) ^ rvmap [1](I[1] + j); |
| 76 | float G0 = rvec[h & 0xff][0]; |
|
|
| 77 | float G1 = rvec[h & 0xff][1]; |
|
|
| 78 | //vec2d G = rvec[h & 0xff]; |
254 | vec2d G = rvec [h & 0xff]; |
| 79 | |
255 | |
| 80 | v += (Ax * G0 + Ay * G1) * p; |
256 | v += dot (A, G) * p; |
| 81 | } |
257 | } |
| 82 | } |
258 | } |
| 83 | |
259 | |
| 84 | return clamp (v * 2, -.9999999f, .9999999f); |
260 | return clamp (v, -.9999999f, .9999999f); |
| 85 | } |
|
|
| 86 | |
|
|
| 87 | #if 0||ABSTRACTION_PENALTY_IS_GONE |
|
|
| 88 | float |
|
|
| 89 | noise2d::noise (float x, float y) |
|
|
| 90 | { |
|
|
| 91 | vec2d X = vec2d (x, y); |
|
|
| 92 | gen_vec<2,int> I = floor (X); |
|
|
| 93 | vec2d F = X - I; |
|
|
| 94 | |
|
|
| 95 | float v = 0; |
|
|
| 96 | |
|
|
| 97 | for (int j = -1; j <= 2; ++j) |
|
|
| 98 | for (int i = -1; i <= 2; ++i) |
|
|
| 99 | { |
|
|
| 100 | vec2d A = F - vec2d (i, j); |
|
|
| 101 | |
|
|
| 102 | float d = A * A; |
|
|
| 103 | |
|
|
| 104 | if (d < 4) |
|
|
| 105 | { |
|
|
| 106 | int h = rvmap [0](I[0] + i) ^ rvmap [1](I[1] + j); |
|
|
| 107 | float *G = rvec [h & 0xff]; |
|
|
| 108 | |
|
|
| 109 | float t1 = 1 - d / 4; |
|
|
| 110 | float t2 = t1 * t1; |
|
|
| 111 | float t4 = t2 * t2; |
|
|
| 112 | |
|
|
| 113 | float p = (4 * t1 - 3) * t4; |
|
|
| 114 | v += A * vec2d (G[0], G[1]) * p; |
|
|
| 115 | } |
|
|
| 116 | } |
|
|
| 117 | |
|
|
| 118 | return clamp (v * 2, -.9999999f, .9999999f); |
|
|
| 119 | } |
261 | } |
| 120 | #endif |
|
|
| 121 | |
262 | |
| 122 | ///////////////////////////////////////////////////////////////////////////// |
263 | ///////////////////////////////////////////////////////////////////////////// |
| 123 | |
264 | |
| 124 | noise3d::noise3d (uint32_t seed) |
265 | noise_gen<vec3d>::noise_gen (uint32_t seed) |
| 125 | { |
266 | { |
| 126 | seedable_rand_gen rng (seed); |
267 | seedable_rand_gen rng (seed); |
| 127 | |
|
|
| 128 | for (int i = 0; i < 256; ++i) |
|
|
| 129 | { |
|
|
| 130 | for (int j = 0; j < 3; ++j) |
|
|
| 131 | rvec [i][j] = rng () - 0.5f; |
|
|
| 132 | |
|
|
| 133 | // normalise |
|
|
| 134 | float mag = 1.f / sqrtf (rvec [i][0] * rvec [i][0] |
|
|
| 135 | + rvec [i][1] * rvec [i][1] |
|
|
| 136 | + rvec [i][2] * rvec [i][2]); |
|
|
| 137 | |
|
|
| 138 | rvec [i][0] *= mag; |
|
|
| 139 | rvec [i][1] *= mag; |
|
|
| 140 | rvec [i][2] *= mag; |
|
|
| 141 | } |
|
|
| 142 | |
268 | |
| 143 | rvmap [0].seed (rng); |
269 | rvmap [0].seed (rng); |
| 144 | rvmap [1].seed (rng); |
270 | rvmap [1].seed (rng); |
| 145 | rvmap [2].seed (rng); |
271 | rvmap [2].seed (rng); |
| 146 | } |
272 | } |
| 147 | |
273 | |
| 148 | float |
274 | vec3d::T_numtype |
| 149 | noise3d::noise (float x, float y, float z) |
275 | noise_gen<vec3d>::operator() (vec3d P) |
| 150 | { |
276 | { |
| 151 | int ix = floorf (x); float fx = x - ix; |
277 | vec3d I = floor (P); |
| 152 | int iy = floorf (y); float fy = y - iy; |
278 | vec3d F = P - I; |
| 153 | int iz = floorf (z); float fz = z - iz; |
|
|
| 154 | |
279 | |
| 155 | float v = 0; |
280 | float v = 0; |
| 156 | |
281 | |
| 157 | for (int j = -1; j <= 2; ++j) |
282 | for (int j = -1; j <= 2; ++j) |
| 158 | for (int i = -1; i <= 2; ++i) |
283 | for (int i = -1; i <= 2; ++i) |
| 159 | for (int k = -1; k <= 2; ++k) |
284 | for (int k = -1; k <= 2; ++k) |
| 160 | { |
285 | { |
| 161 | float Ax = fx - i; |
286 | vec3d A = F - vec3d (i, j, k); |
| 162 | float Ay = fy - j; |
287 | float d = dot (A, A); |
| 163 | float Az = fz - k; |
|
|
| 164 | |
|
|
| 165 | float d = Ax * Ax + Ay * Ay + Az * Az; |
|
|
| 166 | |
288 | |
| 167 | if (d < 4) |
289 | if (d < 4) |
| 168 | { |
290 | { |
| 169 | int h = rvmap [0](ix + i) ^ rvmap [1](iy + j) ^ rvmap [2](iz + k); |
|
|
| 170 | float *G = rvec [h & 0xff]; |
|
|
| 171 | |
|
|
| 172 | float t1 = 1 - d / 4; |
291 | float t1 = 1 - d / 4; |
| 173 | float t2 = t1 * t1; |
292 | float t2 = t1 * t1; |
| 174 | float t4 = t2 * t2; |
293 | float t4 = t2 * t2; |
| 175 | |
294 | |
| 176 | // (4t⁵ - 3t⁴) |
295 | // (4t⁵ - 3t⁴) |
| 177 | float p = (4 * t1 - 3) * t4; |
296 | float p = (4 * t1 - 3) * t4; |
| 178 | v += (Ax * G[0] + Ay * G[1] + Az * G[2]) * p; |
297 | |
|
|
298 | int h = rvmap[0](I[0] + i) ^ rvmap[1](I[1] + j) ^ rvmap[2](I[2] + k); |
|
|
299 | const float *G = charges[h & 0xff]; |
|
|
300 | |
|
|
301 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
| 179 | } |
302 | } |
| 180 | } |
303 | } |
| 181 | |
304 | |
| 182 | return clamp (v * 2, -.9999999f, .9999999f); |
305 | return clamp (v * 2, -.9999999f, .9999999f); |
| 183 | } |
306 | } |
| 184 | |
307 | |
| 185 | float |
308 | vec3d::T_numtype |
| 186 | noise3d::noise (float x, float y, float z, float nx, float ny, float nz) |
309 | noise_gen<vec3d>::operator() (vec3d P, vec3d N) |
| 187 | { |
310 | { |
| 188 | int ix = floorf (x); float fx = x - ix; |
311 | vec3d I = floor (P); |
| 189 | int iy = floorf (y); float fy = y - iy; |
312 | vec3d F = P - I; |
| 190 | int iz = floorf (z); float fz = z - iz; |
|
|
| 191 | |
313 | |
| 192 | float v = 0; |
314 | float v = 0; |
| 193 | |
315 | |
| 194 | for (int j = -1; j <= 2; ++j) |
316 | for (int j = -1; j <= 2; ++j) |
| 195 | for (int i = -1; i <= 2; ++i) |
317 | for (int i = -1; i <= 2; ++i) |
| 196 | for (int k = -1; k <= 2; ++k) |
318 | for (int k = -1; k <= 2; ++k) |
| 197 | { |
319 | { |
| 198 | float Dx = fx - i; |
320 | vec3d D = F - vec3d (i, j, k); |
| 199 | float Dy = fy - j; |
321 | float e = dot (D, N); |
| 200 | float Dz = fz - k; |
|
|
| 201 | |
|
|
| 202 | float e = Dx * nx + Dy * ny + Dz * nz; |
|
|
| 203 | |
|
|
| 204 | float o = 1 - abs (e); |
322 | float o = 1 - abs (e); |
| 205 | |
323 | |
| 206 | if (o > 0) |
324 | if (o > 0) |
| 207 | { |
325 | { |
| 208 | float Ax = Dx - e * nx; |
326 | vec3d A = D - e * N; |
| 209 | float Ay = Dy - e * ny; |
327 | float d = dot (A, A); |
| 210 | float Az = Dz - e * nz; |
|
|
| 211 | |
|
|
| 212 | float d = Ax * Ax + Ay * Ay + Az * Az; |
|
|
| 213 | |
328 | |
| 214 | if (d < 4) |
329 | if (d < 4) |
| 215 | { |
330 | { |
| 216 | int h = rvmap [0](ix + i) ^ rvmap [1](iy + j) ^ rvmap [2](iz + k); |
|
|
| 217 | float *G = rvec [h & 0xff]; |
|
|
| 218 | |
|
|
| 219 | float t1 = 1 - d / 4; |
331 | float t1 = 1 - d / 4; |
| 220 | float t2 = t1 * t1; |
332 | float t2 = t1 * t1; |
| 221 | float t4 = t2 * t2; |
333 | float t4 = t2 * t2; |
| 222 | |
334 | |
| 223 | float o2 = o * o; |
335 | float o2 = o * o; |
| 224 | |
336 | |
| 225 | // (4t⁵ - 3t⁴) * (3o³ - 2o²) |
337 | // (4t⁵ - 3t⁴) * (3o³ - 2o²) |
|
|
338 | // alternative? ((o * 6 - 15) * o + 10) * o³ |
| 226 | float p = (4 * t1 - 3) * t4 * (3 * o2 - 2 * o2 * o); |
339 | float p = (4 * t1 - 3) * t4 * (3 * o2 - 2 * o2 * o); |
| 227 | v += (Ax * G[0] + Ay * G[1] + Az * G[2]) * p; |
340 | |
|
|
341 | int h = rvmap[0](I[0] + i) ^ rvmap[1](I[1] + j) ^ rvmap[2](I[2] + k); |
|
|
342 | const float *G = charges[h & 0xff]; |
|
|
343 | |
|
|
344 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
| 228 | } |
345 | } |
| 229 | } |
346 | } |
| 230 | } |
347 | } |
| 231 | |
348 | |
| 232 | return clamp (v * 2, -.9999999f, .9999999f); |
349 | return clamp (v, -.9999999f, .9999999f); |
| 233 | } |
350 | } |
| 234 | |
351 | |
|
|
352 | template class noise_gen<vec2d>; |
|
|
353 | template class noise_gen<vec3d>; |
|
|
354 | |
|
|
355 | ///////////////////////////////////////////////////////////////////////////// |
|
|
356 | |
|
|
357 | template<class vec_t> |
|
|
358 | static vec_t |
|
|
359 | ith_octave (vec_t P, int i) |
|
|
360 | { |
|
|
361 | vec_t r = P; |
|
|
362 | r[0] += i; |
|
|
363 | return r; |
|
|
364 | } |
|
|
365 | |
|
|
366 | template<class vec_t> |
| 235 | frac_gen::frac_gen (float hurst_expo, float lacunarity) |
367 | frac_gen<vec_t>::frac_gen (value_t hurst_expo, value_t lacunarity) |
| 236 | : h (hurst_expo), lac (lacunarity), noise2d (0) |
368 | : h (hurst_expo), lac (lacunarity), noise_gen<vec_t> (0) |
| 237 | { |
369 | { |
| 238 | float exsum = 0; |
370 | value_t exsum = 0; |
| 239 | |
371 | |
| 240 | for (int i = 0; i < MAX_OCTAVES; ++i) |
372 | for (int i = 0; i < MAX_OCTAVES; ++i) |
| 241 | { |
373 | { |
| 242 | ex [i] = powf (lac, -h * i); |
374 | ex [i] = powf (lac, -h * i); |
| 243 | exsum += ex [i]; |
375 | exsum += ex [i]; |
| 244 | fbm_mul [i] = 0.5f / (exsum * 0.75f); // .75f is a heuristic |
376 | fbm_mul [i] = 0.5f / (exsum * 0.75f); // .75f is a heuristic |
| 245 | rot [i].set (0.4488f * i); |
377 | rot [i].set (0.4488f * i); |
| 246 | } |
378 | } |
| 247 | } |
379 | } |
| 248 | |
380 | |
| 249 | float |
381 | template<class vec_t> |
| 250 | frac_gen::fBm (float x, float y, int octaves) |
382 | typename frac_gen<vec_t>::value_t |
|
|
383 | frac_gen<vec_t>::fBm (vec_t P, int octaves) |
| 251 | { |
384 | { |
| 252 | float v = 0.f; |
385 | value_t v = 0.f; |
| 253 | |
386 | |
| 254 | for (int i = 0; i < octaves; ++i) |
387 | for (int i = 0; i < octaves; ++i) |
| 255 | { |
388 | { |
| 256 | rot [i](x, y); |
389 | rot [i](P); |
| 257 | |
|
|
| 258 | v += noise (x + i, y) * ex [i]; |
390 | v += noise (ith_octave (P, i)) * ex [i]; |
| 259 | |
|
|
| 260 | x *= lac; |
391 | P *= lac; |
| 261 | y *= lac; |
|
|
| 262 | } |
392 | } |
| 263 | |
393 | |
| 264 | return clamp (v * fbm_mul [octaves - 1] + 0.5f, 0.f, .9999999f); |
394 | return clamp (v * fbm_mul [octaves - 1] + 0.5f, 0.f, .9999999f); |
| 265 | } |
395 | } |
| 266 | |
396 | |
| 267 | float |
397 | template<class vec_t> |
| 268 | frac_gen::turbulence (float x, float y, int octaves) |
398 | typename frac_gen<vec_t>::value_t |
|
|
399 | frac_gen<vec_t>::turbulence (vec_t P, int octaves) |
| 269 | { |
400 | { |
| 270 | float v = 0.f; |
401 | value_t v = 0.f; |
| 271 | |
402 | |
| 272 | for (int i = 0; i < octaves; ++i) |
403 | for (int i = 0; i < octaves; ++i) |
| 273 | { |
404 | { |
| 274 | rot [i](x, y); |
405 | rot [i](P); |
| 275 | |
|
|
| 276 | v += fabsf (noise (x + i, y)) * ex [i]; |
406 | v += abs (noise (ith_octave (P, i))) * ex [i]; |
| 277 | |
|
|
| 278 | x *= lac; |
407 | P *= lac; |
| 279 | y *= lac; |
|
|
| 280 | } |
408 | } |
| 281 | |
409 | |
| 282 | return clamp (v * fbm_mul [octaves - 1] * 2.f, 0.f, .9999999f); |
410 | return clamp (v * fbm_mul [octaves - 1] * 2.f, 0.f, .9999999f); |
| 283 | } |
411 | } |
| 284 | |
412 | |
| 285 | float |
413 | template<class vec_t> |
|
|
414 | typename frac_gen<vec_t>::value_t |
| 286 | frac_gen::multifractal (float x, float y, int octaves, float offset) |
415 | frac_gen<vec_t>::multifractal (vec_t P, int octaves, value_t offset) |
| 287 | { |
416 | { |
| 288 | float v = 1.f; |
417 | value_t v = 1.f; |
| 289 | |
418 | |
| 290 | for (int i = 0; i < octaves; ++i) |
419 | for (int i = 0; i < octaves; ++i) |
| 291 | { |
420 | { |
| 292 | rot [i](x, y); |
421 | rot [i](P); |
| 293 | |
|
|
| 294 | v *= noise (x, y) * ex [i] + offset; |
422 | v *= noise (P) * ex [i] + offset; |
| 295 | |
|
|
| 296 | x *= lac; |
423 | P *= lac; |
| 297 | y *= lac; |
|
|
| 298 | } |
424 | } |
| 299 | |
425 | |
| 300 | return clamp (v * 0.5f, 0.f, .9999999f); |
426 | return clamp (v * 0.5f, 0.f, .9999999f); |
| 301 | } |
427 | } |
| 302 | |
428 | |
| 303 | float |
429 | template<class vec_t> |
|
|
430 | typename frac_gen<vec_t>::value_t |
| 304 | frac_gen::heterofractal (float x, float y, int octaves, float offset) |
431 | frac_gen<vec_t>::heterofractal (vec_t P, int octaves, value_t offset) |
| 305 | { |
432 | { |
| 306 | float v = noise (x, y) + offset; |
433 | value_t v = noise (P) + offset; |
| 307 | int i; |
434 | int i; |
| 308 | |
435 | |
| 309 | for (i = 1; i < octaves; ++i) |
436 | for (i = 1; i < octaves; ++i) |
| 310 | { |
437 | { |
| 311 | rot [i](x, y); |
438 | rot [i](P); |
| 312 | |
|
|
| 313 | x *= lac; |
439 | P *= lac; |
| 314 | y *= lac; |
|
|
| 315 | |
|
|
| 316 | v += v * (noise (x, y) * ex [i] + offset); |
440 | v += v * (noise (P) * ex [i] + offset); |
| 317 | } |
441 | } |
| 318 | |
442 | |
| 319 | return v / powf (2., octaves); |
443 | return v / powf (2., octaves); |
| 320 | } |
444 | } |
| 321 | |
445 | |
| 322 | float |
446 | template<class vec_t> |
| 323 | frac_gen::hybridfractal (float x, float y, int octaves, float offset, float gain) |
447 | typename frac_gen<vec_t>::value_t |
|
|
448 | frac_gen<vec_t>::hybridfractal (vec_t P, int octaves, value_t offset, value_t gain) |
| 324 | { |
449 | { |
| 325 | float v = (noise (x, y) + offset) * ex [0]; |
450 | value_t v = (noise (P) + offset) * ex [0]; |
| 326 | float weight = v; |
451 | value_t weight = v; |
| 327 | int i; |
452 | int i; |
| 328 | |
453 | |
| 329 | for (i = 1; i < octaves; ++i) |
454 | for (i = 1; i < octaves; ++i) |
| 330 | { |
455 | { |
| 331 | rot [i](x, y); |
456 | rot [i](P); |
| 332 | |
|
|
| 333 | x *= lac; |
457 | P *= lac; |
| 334 | y *= lac; |
|
|
| 335 | |
458 | |
| 336 | min_it (weight, 1.f); |
459 | min_it (weight, 1.f); |
| 337 | |
460 | |
| 338 | float sig = (noise (x, y) + offset) * ex [i]; |
461 | value_t sig = (noise (P) + offset) * ex [i]; |
| 339 | v += weight * sig; |
462 | v += weight * sig; |
| 340 | weight *= gain * sig; |
463 | weight *= gain * sig; |
| 341 | } |
464 | } |
| 342 | |
465 | |
| 343 | return clamp (v * 0.5f + 0.5f, 0.f, .9999999f); |
466 | return clamp (v * 0.5f + 0.5f, 0.f, .9999999f); |
| 344 | } |
467 | } |
| 345 | |
468 | |
|
|
469 | template<class vec_t> |
|
|
470 | typename frac_gen<vec_t>::value_t |
|
|
471 | frac_gen<vec_t>::ridgedmultifractal (vec_t P, int octaves, value_t offset, value_t gain) |
|
|
472 | { |
|
|
473 | value_t sig = offset - abs (noise (P)); |
|
|
474 | sig *= sig; |
|
|
475 | value_t v = sig; |
|
|
476 | |
|
|
477 | for (int i = 1; i < octaves; ++i) |
|
|
478 | { |
|
|
479 | rot [i](P); |
|
|
480 | P *= lac; |
|
|
481 | |
|
|
482 | value_t w = clamp (sig * gain, 0.f, 1.f); |
|
|
483 | |
|
|
484 | sig = offset - abs (noise (P)); |
|
|
485 | sig *= sig; |
|
|
486 | sig *= w; |
|
|
487 | |
|
|
488 | v += sig * ex [i]; |
|
|
489 | } |
|
|
490 | |
|
|
491 | return clamp (v * 0.25f, 0.f, .9999999f); |
|
|
492 | } |
|
|
493 | |
| 346 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
494 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
| 347 | float |
495 | template<class vec_t> |
| 348 | frac_gen::terrain (float x, float y, int octaves) |
496 | typename frac_gen<vec_t>::value_t |
|
|
497 | frac_gen<vec_t>::terrain (vec_t P, int octaves) |
| 349 | { |
498 | { |
| 350 | float v = 0.f; |
499 | value_t v = 0.f; |
| 351 | |
500 | |
| 352 | for (int i = 0; i < octaves; ++i) |
501 | for (int i = 0; i < octaves; ++i) |
| 353 | { |
502 | { |
| 354 | rot[i] (x, y); |
503 | rot [i](P); |
| 355 | |
|
|
| 356 | v += noise (x + i, y) * ex [i]; |
504 | v += noise (P) * ex [i]; |
| 357 | |
|
|
| 358 | x *= lac; |
505 | P *= lac; |
| 359 | y *= lac; |
|
|
| 360 | } |
506 | } |
| 361 | |
507 | |
| 362 | v *= fbm_mul [octaves - 1]; |
508 | v *= fbm_mul [octaves - 1]; |
| 363 | |
509 | |
| 364 | return v <= 0.f ? - powf (-v, 0.7f) : powf (v, 1. + noise (x, y) * v); |
510 | return v <= 0.f ? - powf (-v, 0.7f) : powf (v, 1. + noise (P) * v); |
| 365 | } |
511 | } |
| 366 | |
512 | |
| 367 | float |
513 | template<class vec_t> |
| 368 | frac_gen::terrain2 (float x, float y, int octaves) |
514 | typename frac_gen<vec_t>::value_t |
|
|
515 | frac_gen<vec_t>::terrain2 (vec_t P, int octaves) |
| 369 | { |
516 | { |
| 370 | float a = fBm (x, y, octaves); |
517 | value_t a = fBm (P, octaves); |
| 371 | float b = ridgedmultifractal (x, y, octaves, 1, 8); |
518 | value_t b = ridgedmultifractal (P, octaves, 1, 8); |
| 372 | float fade = fBm (x + 10.3, y + 10.3, octaves); |
519 | value_t fade = fBm (P + vec_t(10.3), octaves); |
| 373 | |
520 | |
| 374 | const float width = 0.05f; |
521 | const value_t width = 0.05f; |
| 375 | |
522 | |
| 376 | if (fade > 0.5f + width) |
523 | if (fade > 0.5f + width) |
| 377 | return a; |
524 | return a; |
| 378 | else if (fade < 0.5f - width) |
525 | else if (fade < 0.5f - width) |
| 379 | return b; |
526 | return b; |
| … | |
… | |
| 384 | fade = fade * fade * 2 * (1.5f - fade); |
531 | fade = fade * fade * 2 * (1.5f - fade); |
| 385 | |
532 | |
| 386 | return a * fade + b * (1 - fade); |
533 | return a * fade + b * (1 - fade); |
| 387 | } |
534 | } |
| 388 | |
535 | |
| 389 | float |
536 | template class frac_gen<vec2d>; |
| 390 | frac_gen::ridgedmultifractal (float x, float y, int octaves, float offset, float gain) |
537 | template class frac_gen<vec3d>; |
| 391 | { |
|
|
| 392 | float sig = offset - fabsf (noise (x, y)); |
|
|
| 393 | sig *= sig; |
|
|
| 394 | float v = sig; |
|
|
| 395 | |
538 | |
| 396 | for (int i = 1; i < octaves; ++i) |
539 | ///////////////////////////////////////////////////////////////////////////// |
| 397 | { |
|
|
| 398 | rot [i](x, y); |
|
|
| 399 | |
540 | |
| 400 | x *= lac; |
|
|
| 401 | y *= lac; |
|
|
| 402 | |
|
|
| 403 | float w = clamp (sig * gain, 0.f, 1.f); |
|
|
| 404 | |
|
|
| 405 | sig = offset - fabsf (noise (x, y)); |
|
|
| 406 | sig *= sig; |
|
|
| 407 | sig *= w; |
|
|
| 408 | |
|
|
| 409 | v += sig * ex [i]; |
|
|
| 410 | } |
|
|
| 411 | |
|
|
| 412 | return clamp (v * 0.25f, 0.f, .9999999f); |
|
|
| 413 | } |
|
|
| 414 | |
|
|
| 415 | #if 1 |
541 | #if 0 |
| 416 | void hack() |
542 | void hack(); void hack() |
| 417 | { |
543 | { |
| 418 | frac_gen gen (0.5, 2); |
544 | frac_gen<vec2d> gen (0.5, 2); |
| 419 | noise3d n(0); |
545 | frac_gen<vec3d> gen3; |
| 420 | |
546 | |
| 421 | #if 1 |
547 | #if 0 |
| 422 | int N = 1024; |
548 | int N = 1024; |
| 423 | |
549 | |
| 424 | printf ("P5 %d %d 255\n", N, N); |
550 | printf ("P5 %d %d 255\n", N, N); |
| 425 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
551 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
| 426 | for (int y = 0; y < N; ++y) |
552 | for (int y = 0; y < N; ++y) |
| 427 | { |
553 | { |
| 428 | if (!(y&63))fprintf (stderr, "y %d\n", y);//D |
554 | if (!(y&63))fprintf (stderr, "y %d\n", y);//D |
| 429 | for (int x = 0; x < N; ++x) |
555 | for (int x = 0; x < N; ++x) |
| 430 | { |
556 | { |
| 431 | putc (127 * gen.noise (x * 0.04, y * 0.04) + 128, stdout); |
557 | //putc (127 * n.noise (x * 0.1, y * 0.1, 0, 0,0,1) + 128, stdout); |
| 432 | //putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
558 | //putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
| 433 | //putc (256 * gen.fBm (x * 0.01, y * 0.01, 7), stdout); |
559 | //putc (256 * gen.fBm (x * 0.01, y * 0.01, 3), stdout); |
| 434 | //putc (256 * gen.turbulence (x * 0.004 - 1, y * 0.004 - 1, 8), stdout); |
560 | //putc (256 * gen.turbulence (x * 0.004 - 1, y * 0.004 - 1, 8), stdout); |
| 435 | //putc (256 * gen.heterofractal (x * 0.008, y * 0.008, 8, -1.1, 2.0), stdout); |
561 | //putc (256 * gen.heterofractal (x * 0.008, y * 0.008, 8, 0.9), stdout); |
|
|
562 | |
|
|
563 | // mountais or somesuch(?) |
|
|
564 | //putc (256 * gen.hybridfractal (x * 0.01, y * 0.01, 8, -.4, -4), stdout); |
|
|
565 | |
|
|
566 | // temperature |
|
|
567 | //putc (256 * gen.fBm (x * 0.002, y * 0.002, 2), stdout); |
|
|
568 | // rain |
| 436 | //putc (256 * gen.ridgedmultifractal (x * 0.001, y * 0.001, 32, 1.001, 32), stdout); |
569 | //putc (256 * gen.ridgedmultifractal (x * 0.01, y * 0.01, 3, 1.03, 2), stdout); |
| 437 | } |
570 | } |
| 438 | } |
571 | } |
| 439 | #else |
572 | #else |
| 440 | int N = 128; |
573 | int N = 512; |
| 441 | |
574 | |
| 442 | //printf ("P6 %d %d 255\n", N, N); |
575 | //printf ("P6 %d %d 255\n", N, N); |
| 443 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
576 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
| 444 | for (int z = 0; z < N; ++z) |
577 | for (int z = 0; z < N; ++z) |
| 445 | { |
578 | { |
| 446 | if (!(z&4))fprintf (stderr, "z %d\n", z);//D |
579 | if (!(z&7))fprintf (stderr, "z %d\n", z);//D |
| 447 | for (int y = 0; y < N; ++y) |
580 | for (int y = 0; y < N; ++y) |
| 448 | for (int x = 0; x < N; ++x) |
581 | for (int x = 0; x < N; ++x) |
| 449 | { |
582 | { |
| 450 | float v = n.noise (x * 0.06 + 0.2, y * 0.06 + 0.2, z * 0.06 + 0.2) * 0.5 + 0.5; |
583 | float v = gen3.ridgedmultifractal (vec3d (x * 0.01 + 0.2, y * 0.01 + 0.2, z * 0.01 + 0.2), 3, 1.03, 2) * 2; |
| 451 | |
584 | |
|
|
585 | #if 0 |
| 452 | if (z < 64) |
586 | if (z < 64) |
| 453 | v = v * (z * z) / (64 * 64); |
587 | v = v * (z * z) / (64 * 64); |
|
|
588 | #endif |
| 454 | |
589 | |
| 455 | if (v <= 0.1) |
590 | if (v <= 0.9999) |
| 456 | continue; |
591 | continue; |
| 457 | |
592 | |
| 458 | float r[4]; |
593 | float r[4]; |
| 459 | int i[4]; |
594 | int i[4]; |
| 460 | |
595 | |
