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 (©) 2017,2018 Marc Alexander Lehmann / the Deliantra team |
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5 | * Copyright (©) 2010,2011,2012,2013,2014,2015,2016 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
5 | * |
6 | * |
6 | * Deliantra is free software: you can redistribute it and/or modify it under |
7 | * 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 |
8 | * 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 |
9 | * Free Software Foundation, either version 3 of the License, or (at your |
9 | * option) any later version. |
10 | * option) any later version. |
10 | * |
11 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * GNU General Public License for more details. |
15 | * |
16 | * |
16 | * You should have received a copy of the Affero GNU General Public License |
17 | * You should have received a copy of the Affero GNU General Public License |
17 | * and the GNU General Public License along with this program. If not, see |
18 | * and the GNU General Public License along with this program. If not, see |
18 | * <http://www.gnu.org/licenses/>. |
19 | * <http://www.gnu.org/licenses/>. |
19 | * |
20 | * |
20 | * The authors can be reached via e-mail to <support@deliantra.net> |
21 | * The authors can be reached via e-mail to <support@deliantra.net> |
21 | */ |
22 | */ |
22 | |
23 | |
23 | #include "noise.h" |
24 | #include "noise.h" |
24 | |
25 | |
25 | noise_gen::noise_gen (uint32_t seed) |
26 | ///////////////////////////////////////////////////////////////////////////// |
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27 | |
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28 | // perl -e 'for(0..255) { $p = (atan2 1,0) / 64 * $_; printf " %10g, %10g,\n", sin $p, cos $p }' | sort -R |
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29 | static const float charges2[256][2] = { |
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30 | -.975702, -.219101, .893224, .449611, .870087, -.492898, .595699, -.803208, |
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31 | .14673, .989177, .995185, .0980171, .91421, -.405241, -.514103, .857729, |
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32 | -.985278, -.170962, -.689541, -.724247, -.427555, .903989, .83147, -.55557, |
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33 | .999699, -.0245412, .634393, .77301, -.514103, -.857729, -.0735646, -.99729, |
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34 | .514103, -.857729, -.595699, -.803208, -.290285, .95694, .595699, .803208, |
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35 | .266713, .963776, -.33689, .941544, .492898, -.870087, -.471397, -.881921, |
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36 | -.99729, -.0735646, .615232, -.788346, -.91421, -.405241, -.575808, .817585, |
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37 | .0980171, .995185, -.980785, .19509, -.122411, -.99248, .0735646, .99729, |
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38 | -.634393, .77301, -.91421, .405241, .99248, .122411, .903989, -.427555, |
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39 | -.24298, .970031, -.857729, .514103, -.359895, .932993, .382683, .92388, |
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40 | .740951, -.671559, -.893224, .449611, -.95694, -.290285, -.975702, .219101, |
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41 | -.970031, .24298, .999699, .0245412, -.405241, .91421, .985278, .170962, |
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42 | .382683, -.92388, .95694, -.290285, .707107, -.707107, -.817585, -.575808, |
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43 | -.989177, .14673, -.19509, -.980785, -.359895, -.932993, .313682, .949528, |
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44 | -.0980171, .995185, 1, 6.12323e-17, .963776, -.266713, .998795, -.0490677, |
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45 | -.998795, -.0490677, -.970031, -.24298, -.55557, .83147, -.14673, .989177, |
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46 | -.83147, -.55557, -.995185, -.0980171, .870087, .492898, .941544, -.33689, |
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47 | .575808, -.817585, .33689, .941544, .19509, -.980785, 0, 1, |
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48 | .219101, -.975702, -.83147, .55557, .757209, -.653173, -.95694, .290285, |
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49 | -.266713, .963776, -.0490677, .998795, .405241, .91421, -.405241, -.91421, |
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50 | -.689541, .724247, -.534998, -.844854, -.99248, -.122411, .724247, .689541, |
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51 | .492898, .870087, .817585, -.575808, .740951, .671559, -.33689, -.941544, |
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52 | .95694, .290285, .77301, -.634393, .0245412, -.999699, -.77301, -.634393, |
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53 | -.382683, .92388, -.24298, -.970031, -.893224, -.449611, .449611, .893224, |
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54 | .975702, -.219101, -.382683, -.92388, .844854, .534998, -.803208, -.595699, |
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55 | .941544, .33689, .963776, .266713, .932993, .359895, -.0735646, .99729, |
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56 | .634393, -.77301, .405241, -.91421, .33689, -.941544, .99729, .0735646, |
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57 | 1.22465e-16, -1, -.941544, -.33689, .0490677, -.998795, -.313682, .949528, |
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58 | .92388, .382683, -.999699, .0245412, .0245412, .999699, .653173, .757209, |
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59 | -.803208, .595699, .980785, -.19509, .817585, .575808, .975702, .219101, |
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60 | -.615232, -.788346, .99248, -.122411, .998795, .0490677, -.707107, .707107, |
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61 | .803208, -.595699, .671559, .740951, -.757209, -.653173, -.949528, .313682, |
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62 | -.989177, -.14673, -.817585, .575808, -.14673, -.989177, -1, -1.83697e-16, |
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63 | .290285, .95694, -.932993, -.359895, .24298, -.970031, .170962, .985278, |
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64 | -.671559, -.740951, .427555, .903989, .427555, -.903989, -.941544, .33689, |
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65 | -.492898, -.870087, -.266713, -.963776, .857729, -.514103, -.724247, .689541, |
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66 | .724247, -.689541, -.653173, .757209, .689541, -.724247, .949528, -.313682, |
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67 | -.19509, .980785, -.740951, .671559, -.999699, -.0245412, .689541, .724247, |
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68 | .803208, .595699, -.170962, .985278, .0735646, -.99729, .970031, -.24298, |
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69 | -.170962, -.985278, .471397, .881921, .91421, .405241, .893224, -.449611, |
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70 | .0490677, .998795, -.615232, .788346, -.998795, .0490677, -.427555, -.903989, |
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71 | -.0245412, .999699, -.534998, .844854, -.313682, -.949528, -.55557, -.83147, |
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72 | -.903989, -.427555, -.724247, -.689541, -.740951, -.671559, .985278, -.170962, |
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73 | -.857729, -.514103, -.99729, .0735646, .881921, -.471397, .534998, .844854, |
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74 | .359895, -.932993, .77301, .634393, .99729, -.0735646, .290285, -.95694, |
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75 | .575808, .817585, .757209, .653173, .903989, .427555, -.995185, .0980171, |
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76 | -.903989, .427555, -.844854, .534998, -.707107, -.707107, -.92388, .382683, |
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77 | -.653173, -.757209, -.881921, -.471397, -.219101, .975702, -.595699, .803208, |
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78 | .0980171, -.995185, -.788346, .615232, -.0980171, -.995185, -.985278, .170962, |
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79 | .122411, .99248, -.449611, -.893224, .170962, -.985278, .788346, .615232, |
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80 | -.492898, .870087, .671559, -.740951, .449611, -.893224, -.757209, .653173, |
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81 | .83147, .55557, -.290285, -.95694, -.932993, .359895, -.870087, -.492898, |
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82 | .266713, -.963776, -.881921, .471397, -.77301, .634393, -.471397, .881921, |
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83 | .844854, -.534998, .707107, .707107, .534998, -.844854, .514103, .857729, |
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84 | .14673, -.989177, .980785, .19509, -.122411, .99248, -.449611, .893224, |
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85 | .995185, -.0980171, -.634393, -.77301, .857729, .514103, .55557, .83147, |
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86 | -.92388, -.382683, -.844854, -.534998, -.963776, .266713, .989177, -.14673, |
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87 | .313682, -.949528, .359895, .932993, .24298, .970031, -.949528, -.313682, |
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88 | .932993, -.359895, .55557, -.83147, .615232, .788346, -.788346, -.615232, |
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89 | -.0245412, -.999699, -.219101, -.975702, .788346, -.615232, -.99248, .122411, |
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90 | -.671559, .740951, -.870087, .492898, .970031, .24298, .881921, .471397, |
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91 | .122411, -.99248, .471397, -.881921, .19509, .980785, -.963776, -.266713, |
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92 | .92388, -.382683, .989177, .14673, -.575808, -.817585, .219101, .975702, |
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93 | -.0490677, -.998795, -.980785, -.19509, .949528, .313682, .653173, -.757209, |
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94 | }; |
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95 | |
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96 | // http://www-wales.ch.cam.ac.uk/~wales/CCD/Thomson/table.html, random permutation |
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97 | // used as gradient vectors for noise3d |
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98 | static const float charges3[256][3] = { |
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99 | 6.32096444e-01, -6.11406706e-01, 4.76062943e-01, 5.19172442e-01, 8.08229585e-01, -2.77893708e-01, |
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100 | -8.81072422e-01, -4.68301230e-01, 6.63727731e-02, -1.92122323e-01, 9.81341519e-01, -7.60505942e-03, |
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101 | -2.57478265e-01, 9.34157733e-01, -2.47091628e-01, 8.75501090e-01, -1.48087600e-01, -4.59965112e-01, |
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102 | -6.44086082e-01, 3.21868600e-01, 6.93940720e-01, -4.42053435e-01, -1.94962529e-01, -8.75544615e-01, |
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103 | -6.86776297e-01, 5.34610386e-01, -4.92473403e-01, -8.45541961e-01, -2.41708225e-01, 4.76062943e-01, |
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104 | 1.87301993e-01, 3.04913657e-01, 9.33780287e-01, -8.21274139e-01, 4.76841979e-01, -3.13257905e-01, |
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105 | 1.82393582e-01, 9.78673695e-01, -9.45006918e-02, -5.13996405e-01, 5.64894294e-01, -6.45524695e-01, |
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106 | -2.85987088e-01, -5.27238900e-01, -8.00144067e-01, 3.72992508e-01, 8.73495087e-01, 3.12862464e-01, |
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107 | 3.07149790e-02, -1.36108589e-01, 9.90217674e-01, -9.42965190e-01, -1.13726556e-01, 3.12862464e-01, |
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108 | -7.63495246e-01, -8.89713729e-02, -6.39655457e-01, -4.93181655e-01, 3.84537051e-01, -7.80322441e-01, |
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109 | 9.59053138e-01, -6.07981062e-03, -2.83160934e-01, 8.47504655e-02, 6.82510620e-01, -7.25945323e-01, |
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110 | 2.72233465e-01, 7.06503091e-01, 6.53255175e-01, -6.69781595e-01, 6.75521448e-01, -3.08323512e-01, |
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111 | -9.83646297e-01, 1.64266522e-01, -7.38679386e-02, -1.33230986e-01, 4.14543427e-02, 9.90217674e-01, |
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112 | -9.68112521e-01, -2.24691711e-01, 1.10778074e-01, 2.60286884e-01, 5.44444585e-01, -7.97390012e-01, |
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113 | -9.59533574e-01, 4.55017306e-02, -2.77893708e-01, 6.34082129e-01, 7.69729420e-01, -7.38679387e-02, |
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114 | 8.71590956e-01, -4.57032412e-01, -1.77343115e-01, -5.65998169e-01, -6.84162385e-01, -4.59965112e-01, |
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115 | 1.31348131e-01, -9.34573215e-01, 3.30636620e-01, 9.37743461e-01, -2.44096148e-01, -2.47091628e-01, |
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116 | -2.32019785e-03, -9.49665258e-01, -3.13257905e-01, 5.58257270e-01, -6.92564967e-01, -4.56839782e-01, |
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117 | 5.79609682e-01, 2.34839316e-01, -7.80322441e-01, 5.21842141e-02, 4.80310769e-01, -8.75544615e-01, |
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118 | 5.48696303e-01, -4.14651366e-01, -7.25945323e-01, -5.13713359e-02, -3.67059868e-01, 9.28777712e-01, |
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119 | -8.31597157e-01, -5.26303703e-01, -1.77343115e-01, 7.60006362e-01, -6.75440951e-02, -6.46396260e-01, |
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120 | -6.35840799e-01, -7.53287574e-01, 1.68119925e-01, 6.00789426e-01, 3.96860609e-01, 6.93940720e-01, |
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121 | -3.99937982e-02, 9.83336115e-01, -1.77343115e-01, -4.74261299e-01, 8.33604286e-01, -2.83160934e-01, |
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122 | 8.74744319e-01, 8.54351386e-02, -4.76993934e-01, 2.64896284e-01, -6.69736874e-01, 6.93745254e-01, |
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123 | -2.24976555e-01, -1.01696579e-01, -9.69042494e-01, 6.08580404e-01, -2.06649545e-01, 7.66110865e-01, |
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124 | -2.32214607e-01, -7.27581091e-01, -6.45524695e-01, -1.14732673e-01, 7.81826288e-01, -6.12849141e-01, |
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125 | -5.46171508e-01, 5.27060305e-01, 6.51079195e-01, 1.70411976e-01, -3.14665113e-01, 9.33780287e-01, |
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126 | -1.14827108e-01, 9.66494440e-01, 2.29571847e-01, 6.62214703e-01, -4.23664923e-01, 6.18045079e-01, |
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127 | 3.43568839e-01, 1.39041052e-01, 9.28777712e-01, 2.65015805e-01, 5.00565290e-01, 8.24136526e-01, |
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128 | -4.26259648e-01, -7.20031380e-01, 5.47592480e-01, 7.57191364e-01, -5.91945814e-01, 2.76154652e-01, |
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129 | 9.94315593e-01, 4.60290452e-02, 9.60095232e-02, 9.70286575e-01, -1.74010497e-01, 1.68119925e-01, |
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130 | 1.34044431e-01, 9.51719864e-01, 2.76154652e-01, -3.21508279e-01, 6.91956864e-01, -6.46396261e-01, |
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131 | -9.15927355e-01, 3.90047734e-01, -9.45507570e-02, -3.57713970e-01, 9.75145600e-03, 9.33780287e-01, |
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132 | 4.58799092e-01, -6.16720593e-01, -6.39655457e-01, -4.06287592e-01, 9.10837959e-01, -7.28327195e-02, |
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133 | 7.69084079e-01, -2.21547533e-01, 5.99521785e-01, 4.32966564e-02, -7.18729210e-01, 6.93940720e-01, |
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134 | 7.91803580e-01, -4.28020920e-01, 4.35712270e-01, 3.04696154e-01, 7.05691965e-01, -6.39655457e-01, |
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135 | 6.46420856e-01, 4.00281039e-01, -6.49549973e-01, 8.31864266e-01, -3.69542234e-01, -4.14053595e-01, |
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136 | 8.23594337e-01, 4.72823279e-01, -3.13257905e-01, -5.85665015e-01, -8.07274355e-01, -7.28327193e-02, |
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137 | -5.65385161e-02, -4.32158277e-01, -9.00023678e-01, 2.06686552e-01, -8.22754465e-01, 5.29486316e-01, |
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138 | 8.65928642e-01, 3.96271834e-01, 3.05182275e-01, 1.87431189e-02, 4.56064322e-01, 8.89749419e-01, |
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139 | -5.94715001e-01, -2.32669312e-01, 7.69531714e-01, 5.99595825e-01, 1.59473663e-02, -8.00144067e-01, |
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140 | 9.58599657e-02, 6.31372955e-01, 7.69531714e-01, 3.20650220e-01, 8.29747462e-01, -4.56839782e-01, |
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141 | -3.13608737e-01, 5.11291534e-01, -8.00144067e-01, -8.67906788e-01, 4.85339988e-01, 1.05749252e-01, |
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142 | 3.22455909e-01, 9.12507983e-01, -2.51696976e-01, 5.15563696e-01, 7.07202113e-01, -4.83796700e-01, |
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143 | 7.50491607e-01, -5.66571271e-01, -3.40234247e-01, -2.58299208e-01, -3.23551155e-01, -9.10272580e-01, |
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144 | 3.49564167e-01, -9.33995942e-01, -7.38679386e-02, 4.02529304e-01, 1.67115347e-01, -9.00023678e-01, |
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145 | 9.45927846e-01, -3.24287947e-01, -7.60505937e-03, -4.04334848e-01, -2.11800144e-01, 8.89749419e-01, |
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146 | 3.41359400e-01, -4.97637347e-01, -7.97390012e-01, 7.43690080e-01, 5.81037425e-01, 3.30636620e-01, |
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147 | -8.15869544e-01, 2.32381428e-01, 5.29486316e-01, -2.73993936e-01, -4.03941386e-01, 8.72787878e-01, |
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148 | -1.14485896e-01, -9.85759380e-01, -1.23172337e-01, -6.69863977e-01, 3.59676363e-01, -6.49549972e-01, |
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149 | -7.96449717e-01, 5.92027384e-01, -1.23172337e-01, -6.19715090e-01, -4.90274553e-01, -6.12849141e-01, |
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150 | -8.65910917e-01, -3.66659161e-01, -3.40234247e-01, 8.46096973e-01, -5.28880485e-01, 6.63727731e-02, |
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151 | -8.91235794e-01, -3.59774050e-01, 2.76154652e-01, 4.20417732e-01, 3.46935142e-01, 8.38382334e-01, |
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152 | -6.38459078e-01, 7.23512413e-01, 2.62487703e-01, -7.53805524e-01, -6.57053571e-01, -7.60505938e-03, |
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153 | 4.47561005e-01, 5.64275348e-01, 6.93745254e-01, 3.49754488e-02, 9.97181715e-01, 6.63727730e-02, |
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154 | -1.28749619e-01, -5.72643486e-01, 8.09631381e-01, -6.36032129e-01, -6.58092804e-01, 4.02960285e-01, |
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155 | -5.37020119e-01, 8.38088040e-01, 9.60095232e-02, -8.78907490e-01, -1.37182495e-01, -4.56839782e-01, |
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156 | -9.33228374e-01, 1.34065997e-01, 3.33333333e-01, 6.80411181e-01, 5.47277055e-01, -4.87368906e-01, |
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157 | -7.12457289e-01, 1.05461526e-01, 6.93745254e-01, 2.30586085e-01, 3.30051738e-01, -9.15366543e-01, |
|
|
158 | 2.34431211e-02, -7.59957402e-01, -6.49549973e-01, -6.98011937e-01, -3.61662294e-01, 6.18045079e-01, |
|
|
159 | 8.59171516e-01, 2.05105173e-01, 4.68781584e-01, 7.11862181e-01, 6.90797320e-01, 1.26693714e-01, |
|
|
160 | -2.12826534e-01, 4.39256402e-01, 8.72787878e-01, -3.62298594e-01, -9.25543476e-01, -1.10040912e-01, |
|
|
161 | -3.63383159e-01, -8.00268371e-01, -4.76993934e-01, -7.76145796e-01, 5.51780285e-01, 3.05182275e-01, |
|
|
162 | -1.92676248e-01, 7.76820116e-01, 5.99521785e-01, -9.19690664e-01, 2.65359911e-01, -2.89401453e-01, |
|
|
163 | -2.52247996e-02, 8.99732475e-01, 4.35712270e-01, 7.52676085e-01, 4.12472645e-01, 5.13171539e-01, |
|
|
164 | -1.19598027e-01, -8.62070913e-01, -4.92473403e-01, 9.40191063e-01, -1.58443230e-02, 3.40278890e-01, |
|
|
165 | -9.89903836e-01, 3.37653035e-02, 1.37660085e-01, 3.00994355e-01, -4.79793064e-01, 8.24136526e-01, |
|
|
166 | 4.35219899e-01, 8.98427220e-01, -5.84137724e-02, -9.54179119e-01, 2.71092073e-01, 1.26693714e-01, |
|
|
167 | 9.02457799e-02, -5.37560007e-01, 8.38382334e-01, -9.58991702e-02, 9.05186704e-01, -4.14053596e-01, |
|
|
168 | -8.97828463e-02, -9.48052118e-01, 3.05182275e-01, -7.79595183e-01, -5.82690413e-01, 2.29571847e-01, |
|
|
169 | -6.01646284e-01, -4.68072388e-02, -7.97390012e-01, -6.80265196e-01, -6.90061585e-01, -2.47091628e-01, |
|
|
170 | 6.89653756e-01, 6.63795523e-01, -2.89401453e-01, -7.35965096e-01, -5.35644470e-01, -4.14053595e-01, |
|
|
171 | -4.83817118e-01, -8.06307183e-01, 3.40278890e-01, -2.51959468e-01, -8.46616946e-01, 4.68781584e-01, |
|
|
172 | 2.89467531e-01, 9.50755892e-01, 1.10778074e-01, -4.31548997e-01, 3.97822184e-01, 8.09631381e-01, |
|
|
173 | 1.03460411e-01, 8.29768433e-01, -5.48434400e-01, -7.70330748e-01, -3.25284873e-01, -5.48434400e-01, |
|
|
174 | 4.75732892e-01, -5.89012642e-01, 6.53255175e-01, -4.56373945e-01, 8.22151506e-01, 3.40278890e-01, |
|
|
175 | -7.47966357e-01, -1.17490449e-01, 6.53255175e-01, -4.84791839e-01, -8.27524476e-01, -2.83160934e-01, |
|
|
176 | -8.75038211e-01, 3.53535790e-01, 3.30636620e-01, 4.09353123e-01, -6.19180984e-02, -9.10272580e-01, |
|
|
177 | -9.95670746e-01, -7.23021212e-02, -5.84137724e-02, -4.57295474e-01, -8.84117086e-01, 9.60095233e-02, |
|
|
178 | -8.64280276e-02, -6.19376367e-01, -7.80322441e-01, 2.44164564e-02, 2.45683701e-01, -9.69042494e-01, |
|
|
179 | 8.94422292e-01, -3.83804027e-01, 2.29571847e-01, -8.62566691e-01, 4.52816156e-03, 5.05923116e-01, |
|
|
180 | 9.19909533e-01, 2.42287152e-01, -3.08323512e-01, -4.01126232e-01, 3.46675383e-02, -9.15366543e-01, |
|
|
181 | 9.51367455e-01, 2.99880902e-01, 7.05082324e-02, -5.61852646e-01, 1.73058019e-01, -8.08932956e-01, |
|
|
182 | 5.60450847e-01, -8.26125099e-01, -5.84137724e-02, -4.83253958e-01, -4.23721318e-01, 7.66110865e-01, |
|
|
183 | -1.91262533e-02, -8.58072933e-01, 5.13171539e-01, 4.27361843e-01, -7.49268748e-01, 5.05923116e-01, |
|
|
184 | 8.06374324e-01, 3.27460527e-01, -4.92473403e-01, -3.49075205e-01, -5.94876216e-01, 7.24064077e-01, |
|
|
185 | 1.70540147e-01, -3.64719277e-01, -9.15366543e-01, -9.51483049e-01, -1.76998983e-01, -2.51696976e-01, |
|
|
186 | -3.34445776e-01, 9.27298072e-01, 1.68119925e-01, -2.58769450e-02, -2.24111854e-01, -9.74219821e-01, |
|
|
187 | 3.50509628e-01, -8.75232478e-01, 3.33333333e-01, -5.11361160e-01, 7.14833233e-01, -4.76993934e-01, |
|
|
188 | 2.13445517e-01, 8.53114931e-01, 4.76062943e-01, -7.35388206e-01, 6.73967933e-01, 7.05082324e-02, |
|
|
189 | -5.10663512e-01, 1.90624866e-01, 8.38382334e-01, 2.07025032e-01, 8.96458354e-02, -9.74219821e-01, |
|
|
190 | 2.30036908e-01, -9.29155434e-01, -2.89401453e-01, -4.38498083e-01, -6.24412769e-01, -6.46396260e-01, |
|
|
191 | 7.56359490e-01, -6.47294323e-01, -9.45006918e-02, -7.33549832e-01, 4.45600288e-01, 5.13171539e-01, |
|
|
192 | 5.69972682e-01, -7.59768531e-01, 3.12862464e-01, 1.36366351e-02, -9.94299320e-01, 1.05749252e-01, |
|
|
193 | -1.20108971e-01, 6.12129242e-01, -7.81582770e-01, -6.20394866e-01, 7.76531524e-01, -1.10040912e-01, |
|
|
194 | 3.85591729e-01, -2.44264178e-01, 8.89749420e-01, -8.14161423e-01, 3.15614840e-01, -4.87368906e-01, |
|
|
195 | 1.15419311e-01, 9.33230432e-01, -3.40234248e-01, 5.90173960e-01, -2.02047201e-01, -7.81582770e-01, |
|
|
196 | 8.54270153e-01, 5.08959332e-01, 1.05749252e-01, 7.95754924e-01, 5.98192490e-01, -9.45507571e-02, |
|
|
197 | 3.54673147e-01, -8.00092315e-01, -4.83796700e-01, 9.91952607e-01, -1.03563604e-01, -7.28327194e-02, |
|
|
198 | -6.21935152e-02, 2.58972647e-01, 9.63880249e-01, -3.09502921e-01, 8.32249985e-01, -4.59965112e-01, |
|
|
199 | 4.65710308e-01, -8.74164521e-01, 1.37660085e-01, 1.33750242e-01, -8.62891895e-01, -4.87368906e-01, |
|
|
200 | -2.51909022e-01, 8.79866384e-01, 4.02960285e-01, -6.67371446e-11, -8.00239945e-11, -1.00000000e+00, |
|
|
201 | -5.76407831e-01, -5.55272584e-01, 5.99521785e-01, -4.70064989e-01, -4.10082041e-01, -7.81582770e-01, |
|
|
202 | 8.36695291e-01, -9.13599363e-03, 5.47592480e-01, 5.24193529e-01, 8.40399218e-01, 1.37660085e-01, |
|
|
203 | 2.48438744e-01, -7.05895175e-01, -6.63317565e-01, 1.20172431e-01, -9.88240224e-01, -9.45507569e-02, |
|
|
204 | 4.30798964e-01, 4.00049655e-01, -8.08932956e-01, -2.50127938e-01, -9.17808600e-01, -3.08323512e-01, |
|
|
205 | 6.09182992e-01, 5.90373037e-01, 5.29486316e-01, -3.40640313e-01, 5.99746104e-01, 7.24064077e-01, |
|
|
206 | 4.40361132e-01, -8.53731316e-01, -2.77893708e-01, -1.83361859e-01, -7.36528553e-01, 6.51079195e-01, |
|
|
207 | 9.82693460e-01, 1.49011952e-01, -1.10040912e-01, 6.29027140e-01, -7.35509000e-01, -2.51696976e-01, |
|
|
208 | -8.70236843e-01, 9.28902018e-02, -4.83796700e-01, 9.45809668e-01, 1.91165575e-01, 2.62487703e-01, |
|
|
209 | 2.00560098e-01, -1.43987122e-01, -9.69042494e-01, 1.02516007e-01, 9.46542469e-02, 9.90217674e-01, |
|
|
210 | -6.07212048e-01, 6.41511773e-01, 4.68781584e-01, 2.42316938e-01, -9.61889393e-01, 1.26693714e-01, |
|
|
211 | 4.87103783e-01, 5.68101851e-01, -6.63317565e-01, -9.38753073e-01, -3.31379371e-01, -9.45006918e-02, |
|
|
212 | 3.89869221e-01, -2.85348240e-01, -8.75544615e-01, -6.33446768e-01, -2.67859254e-01, -7.25945323e-01, |
|
|
213 | 5.82718746e-01, 7.41166481e-01, 3.33333333e-01, 6.66870337e-01, -5.04483561e-01, -5.48434400e-01, |
|
|
214 | 7.34447763e-01, -2.91551734e-01, -6.12849141e-01, 9.10935613e-01, 3.93731996e-01, -1.23172337e-01, |
|
|
215 | 3.57972341e-02, 7.85327217e-01, 6.18045079e-01, -2.92197503e-01, 2.28018816e-01, 9.28777712e-01 |
|
|
216 | -1.93180133e-01, -1.83347487e-01, 9.63880249e-01, -2.15979248e-01, -9.73848835e-01, 7.05082325e-02, |
|
|
217 | 8.87941151e-01, -2.21773580e-01, 4.02960285e-01, 6.89715518e-01, -4.86988739e-03, 7.24064077e-01, |
|
|
218 | -4.10435643e-01, 7.29167374e-01, 5.47592480e-01, 7.46211012e-01, 1.62686797e-01, -6.45524695e-01, |
|
|
219 | -1.81148087e-01, 1.34466019e-01, -9.74219821e-01, -7.66578780e-01, -4.71711555e-01, 4.35712270e-01, |
|
|
220 | -5.66010160e-01, -2.07722258e-02, 8.24136526e-01, 7.29533368e-01, 2.09468249e-01, 6.51079195e-01, |
|
|
221 | -3.45990788e-01, 2.65042929e-01, -9.00023678e-01, -7.35542526e-01, 1.37793324e-01, -6.63317565e-01, |
|
|
222 | -1.25326447e-01, 6.30370863e-01, 7.66110865e-01, 1.31053682e-01, -5.73107674e-01, -8.08932955e-01, |
|
|
223 | 4.86820470e-01, -3.53150162e-02, 8.72787878e-01, 4.35204849e-01, 7.44740586e-01, 5.05923116e-01, |
|
|
224 | 4.98855035e-01, -3.98703643e-01, 7.69531714e-01, 2.55373649e-01, -7.56251592e-02, 9.63880249e-01, |
|
|
225 | -1.51053916e-01, 3.85469253e-01, -9.10272580e-01, 6.78644990e-01, -7.26064181e-01, 1.10778074e-01, |
|
|
226 | -3.07350590e-01, -9.14677987e-01, 2.62487703e-01, 5.60298616e-01, 1.74821302e-01, 8.09631381e-01, |
|
|
227 | }; |
|
|
228 | |
|
|
229 | ///////////////////////////////////////////////////////////////////////////// |
|
|
230 | |
|
|
231 | template<int N, typename T> |
|
|
232 | void |
|
|
233 | permutation<N,T>::seed (seedable_rand_gen &rng) |
|
|
234 | { |
|
|
235 | for (int i = 0; i < N; ++i) |
|
|
236 | pmap[i] = i; |
|
|
237 | |
|
|
238 | // fisher-yates to randomly perturb |
|
|
239 | for (int i = N; --i; ) |
|
|
240 | ::swap (pmap[i], pmap[rng (i + 1)]); |
|
|
241 | } |
|
|
242 | |
|
|
243 | template class permutation<256, uint8_t>; |
|
|
244 | |
|
|
245 | ///////////////////////////////////////////////////////////////////////////// |
|
|
246 | |
|
|
247 | template<class vec_t> |
|
|
248 | void |
|
|
249 | noise_gen_base<vec_t>::seed (seedable_rand_gen &rng) |
|
|
250 | { |
|
|
251 | for (int i = 0; i < ecb_array_length (rvmap); ++i) |
|
|
252 | rvmap[i].seed (rng); |
|
|
253 | } |
|
|
254 | |
|
|
255 | template<class vec_t> |
|
|
256 | void |
|
|
257 | noise_gen_base<vec_t>::seed (seed_t seed) |
26 | { |
258 | { |
27 | seedable_rand_gen rng (seed); |
259 | seedable_rand_gen rng (seed); |
28 | |
260 | |
29 | for (int i = 0; i < 256; ++i) |
261 | this->seed (rng); |
30 | { |
|
|
31 | for (int j = 0; j < 2; ++j) |
|
|
32 | rvec [i][j] = rng () - 0.5f; |
|
|
33 | |
|
|
34 | // normalise |
|
|
35 | float mag = 1.f / sqrtf (rvec [i][0] * rvec [i][0] + rvec [i][1] * rvec [i][1]); |
|
|
36 | |
|
|
37 | rvec [i][0] *= mag; |
|
|
38 | rvec [i][1] *= mag; |
|
|
39 | } |
|
|
40 | |
|
|
41 | rvmap [0].seed (rng); |
|
|
42 | rvmap [1].seed (rng); |
|
|
43 | } |
262 | } |
44 | |
263 | |
45 | float |
264 | template<> |
46 | noise_gen::noise (float x, float y) |
265 | vec2d::T_numtype |
|
|
266 | noise_gen_base<vec2d>::operator() (vec2d P, uint32_t seed) |
47 | { |
267 | { |
48 | int ix = floorf (x); float fx = x - ix; |
268 | vec2d I = floor (P); |
49 | int iy = floorf (y); float fy = y - iy; |
269 | vec2d F = P - I; |
50 | |
270 | |
51 | float v = 0; |
271 | value_t v = 0; |
|
|
272 | |
|
|
273 | seed *= 3039177861; |
|
|
274 | uint8_t i1 = uint8_t (I[1]) + (seed >> 16); |
|
|
275 | uint8_t i0 = uint8_t (I[0]) + (seed >> 8); |
|
|
276 | |
|
|
277 | uint8_t h2 = rvmap[2](seed); |
52 | |
278 | |
53 | for (int j = -1; j <= 2; ++j) |
279 | for (int j = -1; j <= 2; ++j) |
|
|
280 | { |
|
|
281 | uint8_t h1 = rvmap[1](i1 + j) ^ h2; |
|
|
282 | |
54 | for (int i = -1; i <= 2; ++i) |
283 | for (int i = -1; i <= 2; ++i) |
55 | { |
284 | { |
56 | float Ax = fx - i; |
285 | vec2d A = F - vec2d (i, j); |
57 | float Ay = fy - j; |
286 | value_t d = dot (A, A); |
58 | |
287 | |
59 | float d = Ax * Ax + Ay * Ay; |
|
|
60 | |
|
|
61 | if (d < 4) |
288 | if (d < 4) |
62 | { |
289 | { |
63 | int h = rvmap [0](ix + i) ^ rvmap [1](iy + j); |
|
|
64 | float *G = rvec [h & 0xff]; |
|
|
65 | |
|
|
66 | float t1 = 1 - d / 4; |
290 | value_t t1 = 1 - d / 4; |
67 | float t2 = t1 * t1; |
291 | value_t t2 = t1 * t1; |
68 | float t4 = t2 * t2; |
292 | value_t t4 = t2 * t2; |
69 | |
293 | |
70 | float p = (4 * t1 - 3) * t4; |
294 | value_t p = (4 * t1 - 3) * t4; |
71 | v += (Ax * G[0] + Ay * G[1]) * p; |
295 | |
|
|
296 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
|
|
297 | vec2d G = charges2[h & 0xff]; |
|
|
298 | |
|
|
299 | v += dot (A, G) * p; |
72 | } |
300 | } |
73 | } |
301 | } |
74 | |
|
|
75 | return clamp (v * 2, -.9999999f, .9999999f); |
|
|
76 | } |
|
|
77 | |
|
|
78 | frac_gen::frac_gen (float hurst_expo, float lacunarity) |
|
|
79 | : h (hurst_expo), lac (lacunarity), noise_gen (0) |
|
|
80 | { |
|
|
81 | float exsum = 0; |
|
|
82 | |
|
|
83 | for (int i = 0; i < MAX_OCTAVES; ++i) |
|
|
84 | { |
302 | } |
|
|
303 | |
|
|
304 | return v; |
|
|
305 | } |
|
|
306 | |
|
|
307 | ///////////////////////////////////////////////////////////////////////////// |
|
|
308 | |
|
|
309 | template<> |
|
|
310 | vec3d::T_numtype |
|
|
311 | noise_gen_base<vec3d>::operator() (vec3d P, uint32_t seed) |
|
|
312 | { |
|
|
313 | vec3d I = floor (P); |
|
|
314 | vec3d F = P - I; |
|
|
315 | |
|
|
316 | seed *= 3039177861; |
|
|
317 | uint8_t i2 = uint8_t (I[2]) + (seed >> 24); |
|
|
318 | uint8_t i1 = uint8_t (I[1]) + (seed >> 16); |
|
|
319 | uint8_t i0 = uint8_t (I[0]) + (seed >> 8); |
|
|
320 | |
|
|
321 | uint8_t h3 = rvmap[3](seed); |
|
|
322 | |
|
|
323 | value_t v = 0; |
|
|
324 | |
|
|
325 | for (int k = -1; k <= 2; ++k) |
|
|
326 | { |
|
|
327 | uint8_t h2 = rvmap[2](i2 + k) ^ h3; |
|
|
328 | |
|
|
329 | for (int j = -1; j <= 2; ++j) |
|
|
330 | { |
|
|
331 | uint8_t h1 = rvmap[1](i1 + j) ^ h2; |
|
|
332 | |
|
|
333 | for (int i = -1; i <= 2; ++i) |
|
|
334 | { |
|
|
335 | vec3d A = F - vec3d (i, j, k); |
|
|
336 | value_t d = dot (A, A); |
|
|
337 | |
|
|
338 | if (d < 4) |
|
|
339 | { |
|
|
340 | value_t t1 = 1 - d / 4; |
|
|
341 | value_t t2 = t1 * t1; |
|
|
342 | value_t t4 = t2 * t2; |
|
|
343 | |
|
|
344 | // (4t⁵ - 3t⁴) |
|
|
345 | value_t p = (4 * t1 - 3) * t4; |
|
|
346 | |
|
|
347 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
|
|
348 | const value_t *G = charges3[h & 0xff]; |
|
|
349 | |
|
|
350 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
|
|
351 | } |
|
|
352 | } |
|
|
353 | } |
|
|
354 | } |
|
|
355 | |
|
|
356 | return v * 2; |
|
|
357 | } |
|
|
358 | |
|
|
359 | vec3d::T_numtype |
|
|
360 | noise_gen<vec3d>::operator() (vec3d P, vec3d N, uint32_t seed) |
|
|
361 | { |
|
|
362 | vec3d I = floor (P); |
|
|
363 | vec3d F = P - I; |
|
|
364 | |
|
|
365 | seed *= 3039177861; |
|
|
366 | uint8_t i2 = uint8_t (I[2]) + (seed >> 24); |
|
|
367 | uint8_t i1 = uint8_t (I[1]) + (seed >> 16); |
|
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368 | uint8_t i0 = uint8_t (I[0]) + (seed >> 8); |
|
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369 | |
|
|
370 | uint8_t h3 = rvmap[3](seed); |
|
|
371 | |
|
|
372 | value_t v = 0; |
|
|
373 | |
|
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374 | for (int k = -1; k <= 2; ++k) |
|
|
375 | { |
|
|
376 | uint8_t h2 = rvmap[2](i2 + k) ^ h3; |
|
|
377 | |
|
|
378 | for (int j = -1; j <= 2; ++j) |
|
|
379 | { |
|
|
380 | uint8_t h1 = rvmap[1](i1 + j) ^ h2; |
|
|
381 | |
|
|
382 | for (int i = -1; i <= 2; ++i) |
|
|
383 | { |
|
|
384 | vec3d D = F - vec3d (i, j, k); |
|
|
385 | value_t e = dot (D, N); |
|
|
386 | value_t o = 1 - abs (e); |
|
|
387 | |
|
|
388 | if (o > 0) |
|
|
389 | { |
|
|
390 | vec3d A = D - e * N; |
|
|
391 | value_t d = dot (A, A); |
|
|
392 | |
|
|
393 | if (d < 4) |
|
|
394 | { |
|
|
395 | value_t t1 = 1 - d / 4; |
|
|
396 | value_t t2 = t1 * t1; |
|
|
397 | value_t t4 = t2 * t2; |
|
|
398 | |
|
|
399 | value_t o2 = o * o; |
|
|
400 | |
|
|
401 | // (4t⁵ - 3t⁴) * (3o³ - 2o²) |
|
|
402 | // alternative? ((o * 6 - 15) * o + 10) * o³ |
|
|
403 | value_t p = (4 * t1 - 3) * t4 * (3 * o2 - 2 * o2 * o); |
|
|
404 | |
|
|
405 | uint8_t h = rvmap[0](i0 + i) ^ h1; |
|
|
406 | const value_t *G = charges3[h & 0xff]; |
|
|
407 | |
|
|
408 | v += dot (A, vec3d (G[0], G[1], G[2])) * p; |
|
|
409 | } |
|
|
410 | } |
|
|
411 | } |
|
|
412 | } |
|
|
413 | } |
|
|
414 | |
|
|
415 | return v; |
|
|
416 | } |
|
|
417 | |
|
|
418 | ///////////////////////////////////////////////////////////////////////////// |
|
|
419 | |
|
|
420 | template<class vec_t> |
|
|
421 | frac_gen<vec_t>::frac_gen (int octaves, value_t lacunarity, value_t hurst_expo, seed_t seed) |
|
|
422 | : octaves (octaves), lac (lacunarity), h (hurst_expo) |
|
|
423 | { |
|
|
424 | this->seed (seed); |
|
|
425 | |
|
|
426 | value_t exsum = 0; |
|
|
427 | value_t phi = noise (vec_t (value_t (0))) * 0.5 + 1; |
|
|
428 | |
|
|
429 | for (int i = 0; i < octaves; ++i) |
|
|
430 | { |
85 | ex [i] = powf (lac, -h * i); |
431 | ex [i] = pow (lac, -h * i); |
86 | exsum += ex [i]; |
432 | exsum += ex [i]; |
87 | fbm_mul [i] = 0.5f / (exsum * 0.75f); // .75f is a heuristic |
433 | fbm_mul [i] = 0.5 / (exsum * 0.75); // .75 is a heuristic |
88 | rot [i].set (0.4488f * i); |
434 | rot [i].set (phi * i + 1); |
89 | } |
435 | } |
90 | } |
436 | } |
91 | |
437 | |
92 | float |
438 | template<class vec_t> |
93 | frac_gen::fBm (float x, float y, int octaves) |
439 | typename frac_gen<vec_t>::value_t |
|
|
440 | frac_gen<vec_t>::fBm (vec_t P) |
94 | { |
441 | { |
95 | float v = 0.f; |
442 | value_t v = 0; |
96 | |
443 | |
97 | for (int i = 0; i < octaves; ++i) |
444 | for (int i = 0; i < octaves; ++i) |
98 | { |
445 | { |
99 | rot [i](x, y); |
446 | rot [i](P); |
100 | |
|
|
101 | v += noise (x + i, y) * ex [i]; |
447 | v += noise (P, i) * ex [i]; |
102 | |
|
|
103 | x *= lac; |
448 | P *= lac; |
104 | y *= lac; |
|
|
105 | } |
449 | } |
106 | |
450 | |
107 | return clamp (v * fbm_mul [octaves - 1] + 0.5f, 0.f, .9999999f); |
451 | return v * fbm_mul [octaves - 1]; |
108 | } |
452 | } |
109 | |
453 | |
110 | float |
454 | template<class vec_t> |
111 | frac_gen::turbulence (float x, float y, int octaves) |
455 | typename frac_gen<vec_t>::value_t |
|
|
456 | frac_gen<vec_t>::turbulence (vec_t P) |
112 | { |
457 | { |
113 | float v = 0.f; |
458 | value_t v = 0; |
114 | |
459 | |
115 | for (int i = 0; i < octaves; ++i) |
460 | for (int i = 0; i < octaves; ++i) |
116 | { |
461 | { |
117 | rot [i](x, y); |
462 | rot [i](P); |
118 | |
|
|
119 | v += fabsf (noise (x + i, y)) * ex [i]; |
463 | v += abs (noise (P, i)) * ex [i]; |
120 | |
|
|
121 | x *= lac; |
464 | P *= lac; |
122 | y *= lac; |
|
|
123 | } |
465 | } |
124 | |
466 | |
125 | return clamp (v * fbm_mul [octaves - 1] * 2.f, 0.f, .9999999f); |
467 | return v * fbm_mul [octaves - 1] * (0.5 / noise_gen<vec_t>::abs_avg ()); |
126 | } |
468 | } |
127 | |
469 | |
128 | float |
470 | template<class vec_t> |
129 | frac_gen::multifractal (float x, float y, int octaves, float offset) |
471 | typename frac_gen<vec_t>::value_t |
|
|
472 | frac_gen<vec_t>::multifractal (vec_t P, value_t offset) |
130 | { |
473 | { |
131 | float v = 1.f; |
474 | value_t v = 1; |
132 | |
475 | |
133 | for (int i = 0; i < octaves; ++i) |
476 | for (int i = 0; i < octaves; ++i) |
134 | { |
477 | { |
135 | rot [i](x, y); |
478 | rot [i](P); |
136 | |
|
|
137 | v *= noise (x, y) * ex [i] + offset; |
479 | v *= noise (P) * ex [i] + offset; |
138 | |
|
|
139 | x *= lac; |
480 | P *= lac; |
140 | y *= lac; |
|
|
141 | } |
481 | } |
142 | |
482 | |
143 | return clamp (v * 0.5f, 0.f, .9999999f); |
483 | return v * value_t (0.5); |
144 | } |
484 | } |
145 | |
485 | |
146 | float |
486 | template<class vec_t> |
147 | frac_gen::heterofractal (float x, float y, int octaves, float offset) |
487 | typename frac_gen<vec_t>::value_t |
|
|
488 | frac_gen<vec_t>::heterofractal (vec_t P, value_t offset) |
148 | { |
489 | { |
149 | float v = noise (x, y) + offset; |
490 | value_t v = noise (P) + offset; |
150 | int i; |
|
|
151 | |
491 | |
152 | for (i = 1; i < octaves; ++i) |
492 | for (int i = 1; i < octaves; ++i) |
153 | { |
493 | { |
154 | rot [i](x, y); |
494 | rot [i](P); |
155 | |
|
|
156 | x *= lac; |
495 | P *= lac; |
157 | y *= lac; |
|
|
158 | |
|
|
159 | v += v * (noise (x, y) * ex [i] + offset); |
496 | v += v * (noise (P) * ex [i] + offset); |
160 | } |
497 | } |
161 | |
498 | |
162 | return v / powf (2., octaves); |
499 | return v / (1 << octaves); |
163 | } |
500 | } |
164 | |
501 | |
165 | float |
502 | template<class vec_t> |
166 | frac_gen::hybridfractal (float x, float y, int octaves, float offset, float gain) |
503 | typename frac_gen<vec_t>::value_t |
|
|
504 | frac_gen<vec_t>::hybridfractal (vec_t P, value_t offset, value_t gain) |
167 | { |
505 | { |
168 | float v = (noise (x, y) + offset) * ex [0]; |
506 | value_t v = (noise (P) + offset) * ex [0]; |
169 | float weight = v; |
507 | value_t weight = v; |
170 | int i; |
|
|
171 | |
508 | |
172 | for (i = 1; i < octaves; ++i) |
509 | for (int i = 1; i < octaves; ++i) |
173 | { |
510 | { |
174 | rot [i](x, y); |
511 | rot [i](P); |
175 | |
|
|
176 | x *= lac; |
512 | P *= lac; |
177 | y *= lac; |
|
|
178 | |
513 | |
179 | min_it (weight, 1.f); |
514 | min_it (weight, 1); |
180 | |
515 | |
181 | float sig = (noise (x, y) + offset) * ex [i]; |
516 | value_t sig = (noise (P) + offset) * ex [i]; |
182 | v += weight * sig; |
517 | v += weight * sig; |
183 | weight *= gain * sig; |
518 | weight *= gain * sig; |
184 | } |
519 | } |
185 | |
520 | |
186 | return clamp (v * 0.5f + 0.5f, 0.f, .9999999f); |
521 | return v * value_t (0.5) + value_t (0.5); |
187 | } |
522 | } |
188 | |
523 | |
189 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
524 | template<class vec_t> |
190 | float |
525 | typename frac_gen<vec_t>::value_t |
191 | frac_gen::terrain (float x, float y, int octaves) |
526 | frac_gen<vec_t>::ridgedmultifractal (vec_t P, value_t offset, value_t gain) |
192 | { |
527 | { |
193 | float v = 0.f; |
|
|
194 | |
|
|
195 | for (int i = 0; i < octaves; ++i) |
|
|
196 | { |
|
|
197 | rot[i] (x, y); |
|
|
198 | |
|
|
199 | v += noise (x + i, y) * ex [i]; |
|
|
200 | |
|
|
201 | x *= lac; |
|
|
202 | y *= lac; |
|
|
203 | } |
|
|
204 | |
|
|
205 | v *= fbm_mul [octaves - 1]; |
|
|
206 | |
|
|
207 | return v <= 0.f ? - powf (-v, 0.7f) : powf (v, 1. + noise (x, y) * v); |
|
|
208 | } |
|
|
209 | |
|
|
210 | float |
|
|
211 | frac_gen::terrain2 (float x, float y, int octaves) |
|
|
212 | { |
|
|
213 | float a = fBm (x, y, octaves); |
|
|
214 | float b = ridgedmultifractal (x, y, octaves, 1, 8); |
|
|
215 | float fade = fBm (x + 10.3, y + 10.3, octaves); |
|
|
216 | |
|
|
217 | const float width = 0.05f; |
|
|
218 | |
|
|
219 | if (fade > 0.5f + width) |
|
|
220 | return a; |
|
|
221 | else if (fade < 0.5f - width) |
|
|
222 | return b; |
|
|
223 | |
|
|
224 | fade = (fade - 0.5f + width) / (width * 2); |
|
|
225 | |
|
|
226 | // sigmoidal curve |
|
|
227 | fade = fade * fade * 2 * (1.5f - fade); |
|
|
228 | |
|
|
229 | return a * fade + b * (1 - fade); |
|
|
230 | } |
|
|
231 | |
|
|
232 | float |
|
|
233 | frac_gen::ridgedmultifractal (float x, float y, int octaves, float offset, float gain) |
|
|
234 | { |
|
|
235 | float sig = offset - fabsf (noise (x, y)); |
528 | value_t sig = offset - abs (noise (P)); |
236 | sig *= sig; |
529 | sig *= sig; |
237 | float v = sig; |
530 | value_t v = sig; |
238 | |
531 | |
239 | for (int i = 1; i < octaves; ++i) |
532 | for (int i = 1; i < octaves; ++i) |
240 | { |
533 | { |
241 | rot [i](x, y); |
534 | rot [i](P); |
242 | |
|
|
243 | x *= lac; |
535 | P *= lac; |
244 | y *= lac; |
|
|
245 | |
536 | |
|
|
537 | // weight higher octaves by previous signal |
246 | float w = clamp (sig * gain, 0.f, 1.f); |
538 | value_t w = clamp (sig * gain, 0, 1); |
247 | |
539 | |
248 | sig = offset - fabsf (noise (x, y)); |
540 | sig = offset - abs (noise (P)); |
249 | sig *= sig; |
541 | sig *= sig; |
250 | sig *= w; |
542 | sig *= w; |
251 | |
543 | |
252 | v += sig * ex [i]; |
544 | v += sig * ex [i]; |
253 | } |
545 | } |
254 | |
546 | |
255 | return clamp (v * 0.25f, 0.f, .9999999f); |
547 | return v * value_t (0.25); |
256 | } |
548 | } |
257 | |
549 | |
258 | #if 0 |
550 | template<class vec_t> |
259 | void hack() |
551 | typename frac_gen<vec_t>::value_t |
|
|
552 | frac_gen<vec_t>::billowfractal (vec_t P, value_t offset, value_t gain) |
260 | { |
553 | { |
261 | frac_gen gen (0.5, 2); |
554 | value_t v = 0; |
262 | |
555 | |
263 | int N = 1024; |
556 | offset += 2 * noise_gen<vec_t>::abs_avg () - 1; |
264 | |
557 | |
265 | printf ("P5 %d %d 255\n", N, N); |
|
|
266 | // pmake&&server/deliantra-server >x&&convert -depth 8 -size 512xx512 gray:x x.ppm&& cv x.ppm |
|
|
267 | for (int y = 0; y < N; ++y) |
558 | for (int i = 0; i < octaves; ++i) |
268 | { |
|
|
269 | if (!(y&63))fprintf (stderr, "y %d\n", y);//D |
|
|
270 | for (int x = 0; x < N; ++x) |
|
|
271 | { |
559 | { |
272 | //putc (128 + 128 * gen.noise (x * 0.04, y * 0.04), stdout); |
560 | rot [i](P); |
273 | putc (256 * gen.terrain2 (x * 0.004, y * 0.004, 8), stdout); |
561 | v += (abs (noise (P, i)) * gain - offset) * ex [i]; |
274 | //putc (256 * gen.fBm (x * 0.001, y * 0.001, 3), stdout); |
562 | P *= lac; |
275 | //putc (256 * gen.turbulence (x * 0.004 - 1, y * 0.004 - 1, 8), stdout); |
|
|
276 | //putc (256 * gen.heterofractal (x * 0.008, y * 0.008, 8, -1.1, 2.0), stdout); |
|
|
277 | //putc (256 * gen.ridgedmultifractal (x * 0.001, y * 0.001, 32, 1.001, 32), stdout); |
|
|
278 | } |
563 | } |
|
|
564 | |
|
|
565 | return v; |
|
|
566 | } |
|
|
567 | |
|
|
568 | // http://www.gamasutra.com/view/feature/3098/a_realtime_procedural_universe_.php?page=2 |
|
|
569 | template<class vec_t> |
|
|
570 | typename frac_gen<vec_t>::value_t |
|
|
571 | frac_gen<vec_t>::terrain (vec_t P) |
|
|
572 | { |
|
|
573 | value_t v = 0; |
|
|
574 | |
|
|
575 | for (int i = 0; i < octaves; ++i) |
279 | } |
576 | { |
|
|
577 | rot [i](P); |
|
|
578 | v += noise (P) * ex [i]; |
|
|
579 | P *= lac; |
|
|
580 | } |
280 | |
581 | |
281 | exit (0); |
582 | v *= fbm_mul [octaves - 1]; |
|
|
583 | |
|
|
584 | return v <= 0 ? - pow (-v, 0.7) : pow (v, 1 + noise (P) * v); |
282 | } |
585 | } |
283 | #endif |
586 | |
|
|
587 | template<class vec_t> |
|
|
588 | typename frac_gen<vec_t>::value_t |
|
|
589 | frac_gen<vec_t>::terrain2 (vec_t P) |
|
|
590 | { |
|
|
591 | value_t a = fBm (P); |
|
|
592 | value_t b = ridgedmultifractal (P, 1, 8); |
|
|
593 | value_t fade = fBm (P + vec_t(10.3)); |
|
|
594 | |
|
|
595 | const value_t width = 0.05; |
|
|
596 | |
|
|
597 | if (fade > 0.5 + width) |
|
|
598 | return a; |
|
|
599 | else if (fade < 0.5 - width) |
|
|
600 | return b; |
|
|
601 | |
|
|
602 | fade = (fade - 0.5 + width) / (width * 2); |
|
|
603 | |
|
|
604 | // sigmoidal curve |
|
|
605 | fade = fade * fade * 2 * (1.5 - fade); |
|
|
606 | |
|
|
607 | return a * fade + b * (1 - fade); |
|
|
608 | } |
|
|
609 | |
|
|
610 | template class frac_gen<vec2d>; |
|
|
611 | template class frac_gen<vec3d>; |
|
|
612 | |