| 1 |
/* |
| 2 |
* This file is part of Deliantra, the Roguelike Realtime MMORPG. |
| 3 |
* |
| 4 |
* Copyright (©) 2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team |
| 5 |
* |
| 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 |
| 8 |
* Free Software Foundation, either version 3 of the License, or (at your |
| 9 |
* option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* 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 |
* <http://www.gnu.org/licenses/>. |
| 19 |
* |
| 20 |
* The authors can be reached via e-mail to <support@deliantra.net> |
| 21 |
*/ |
| 22 |
|
| 23 |
#ifndef NOISE_H_ |
| 24 |
#define NOISE_H_ |
| 25 |
|
| 26 |
#include <blitz/tinyvec.h> |
| 27 |
#include <blitz/tinyvec-et.h> |
| 28 |
|
| 29 |
#include "global.h" |
| 30 |
|
| 31 |
typedef blitz::TinyVector<float,2> vec2d; |
| 32 |
typedef blitz::TinyVector<float,3> vec3d; |
| 33 |
|
| 34 |
///////////////////////////////////////////////////////////////////////////// |
| 35 |
|
| 36 |
template<int N, typename T = uint8_t> |
| 37 |
struct permutation |
| 38 |
{ |
| 39 |
T pmap[N]; |
| 40 |
|
| 41 |
template<class random_generator> |
| 42 |
void seed (random_generator &rng); |
| 43 |
|
| 44 |
T operator ()(T v) |
| 45 |
{ |
| 46 |
return pmap[v & (N - 1)]; |
| 47 |
} |
| 48 |
}; |
| 49 |
|
| 50 |
template<class vec_t> |
| 51 |
struct noise_gen; |
| 52 |
|
| 53 |
// modelled after 2d/3d kensler noise without projection |
| 54 |
template<> |
| 55 |
struct noise_gen<vec2d> |
| 56 |
{ |
| 57 |
static vec2d::T_numtype abs_avg() { return 0.2231; } // avg(abs(noise)) |
| 58 |
|
| 59 |
permutation<256, uint8_t> rvmap[2]; |
| 60 |
|
| 61 |
noise_gen<vec2d> (uint32_t seed); |
| 62 |
vec2d::T_numtype operator() (vec2d P); |
| 63 |
}; |
| 64 |
|
| 65 |
template<> |
| 66 |
struct noise_gen<vec3d> |
| 67 |
{ |
| 68 |
static vec3d::T_numtype abs_avg() { return 0.415; } // avg(abs(noise)) |
| 69 |
|
| 70 |
permutation<256, uint8_t> rvmap[3]; |
| 71 |
|
| 72 |
noise_gen<vec3d> (uint32_t seed); |
| 73 |
vec2d::T_numtype operator() (vec3d P); |
| 74 |
|
| 75 |
// noise projected on a surface with normal n |
| 76 |
vec2d::T_numtype operator() (vec3d P, vec3d N); |
| 77 |
}; |
| 78 |
|
| 79 |
template<class vec_t, int a, int b> |
| 80 |
struct rotate_nn |
| 81 |
{ |
| 82 |
typename vec_t::T_numtype s, c; |
| 83 |
|
| 84 |
void set (typename vec_t::T_numtype angle) |
| 85 |
{ |
| 86 |
s = sin (angle); |
| 87 |
c = cos (angle); |
| 88 |
} |
| 89 |
|
| 90 |
void operator ()(vec_t &P) const |
| 91 |
{ |
| 92 |
vec_t o = P; |
| 93 |
|
| 94 |
P[a] = o[a] * c - o[b] * s; |
| 95 |
P[b] = o[a] * s + o[b] * c; |
| 96 |
} |
| 97 |
}; |
| 98 |
|
| 99 |
template<class vec_t> |
| 100 |
struct rotate_xy : rotate_nn<vec_t, 0, 1> |
| 101 |
{ |
| 102 |
}; |
| 103 |
|
| 104 |
template<class vec_t> |
| 105 |
struct rotate_xz : rotate_nn<vec_t, 0, 2> |
| 106 |
{ |
| 107 |
}; |
| 108 |
|
| 109 |
template<class vec_t> |
| 110 |
struct rotate_yz : rotate_nn<vec_t, 1, 2> |
| 111 |
{ |
| 112 |
}; |
| 113 |
|
| 114 |
template<class vec_t> |
| 115 |
struct frac_gen |
| 116 |
: noise_gen<vec_t> |
| 117 |
{ |
| 118 |
enum { MAX_OCTAVES = 32 }; |
| 119 |
|
| 120 |
typedef typename vec_t::T_numtype value_t; |
| 121 |
|
| 122 |
value_t h, lac, ex[MAX_OCTAVES]; |
| 123 |
value_t fbm_mul[MAX_OCTAVES]; |
| 124 |
rotate_xy<vec_t> rot[MAX_OCTAVES]; |
| 125 |
|
| 126 |
value_t noise (vec_t P) |
| 127 |
{ |
| 128 |
return operator() (P); |
| 129 |
} |
| 130 |
|
| 131 |
frac_gen (value_t hurst_expo = .5, value_t lacunarity = 2); |
| 132 |
|
| 133 |
value_t fBm (vec_t P, int octaves); |
| 134 |
value_t turbulence (vec_t P, int octaves); |
| 135 |
value_t multifractal (vec_t P, int octaves, value_t offset = 1); |
| 136 |
value_t heterofractal (vec_t P, int octaves, value_t offset = 1); |
| 137 |
value_t hybridfractal (vec_t P, int octaves, value_t offset = 1, value_t gain = 1); |
| 138 |
value_t ridgedmultifractal (vec_t P, int octaves, value_t offset = 1, value_t gain = 8); |
| 139 |
value_t billowfractal (vec_t P, int octaves, value_t offset = 1, value_t gain = 2); |
| 140 |
value_t terrain (vec_t P, int octaves); |
| 141 |
value_t terrain2 (vec_t P, int octaves); |
| 142 |
}; |
| 143 |
|
| 144 |
#endif |
| 145 |
|
