[ViewVC] Diff of: cvs/deliantra/server/include/noise.h

Comparing deliantra/server/include/noise.h (file contents):
Revision 1.6 by root, Sat Apr 23 04:56:49 2011 UTC vs.
Revision 1.17 by root, Wed Nov 28 17:41:45 2012 UTC

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 (©) 2010,2011 Marc Alexander Lehmann / Robin Redeker / the Deliantra team	4	* Copyright (©) 2010,2011,2012 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.
10	*	10	*
11	* This program is distributed in the hope that it will be useful,	11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.	14	* GNU General Public License for more details.
15	*	15	*
16	* You should have received a copy of the Affero GNU General Public License	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	17	* and the GNU General Public License along with this program. If not, see
18	* <http://www.gnu.org/licenses/>.	18	* <http://www.gnu.org/licenses/>.
19	*	19	*
20	* The authors can be reached via e-mail to <support@deliantra.net>	20	* The authors can be reached via e-mail to <support@deliantra.net>
21	*/	21	*/
22		22
23	#ifndef NOISE_H_	23	#ifndef NOISE_H_
24	#define NOISE_H_	24	#define NOISE_H_
25		25
		26	#include <string.h> // workaround for tinyvec using memcpy without including string.h
26	#include <blitz/tinyvec.h>	27	#include <blitz/tinyvec.h>
27	#include <blitz/tinyvec-et.h>	28	#include <blitz/tinyvec-et.h>
28		29
29	#include "global.h"	30	#include "global.h"
30		31
31	typedef blitz::TinyVector<float,2> vec2d;	32	typedef blitz::TinyVector<float,2> vec2d;
32	typedef blitz::TinyVector<float,3> vec3d;	33	typedef blitz::TinyVector<float,3> vec3d;
33		34
34	/////////////////////////////////////////////////////////////////////////////	35	vec2d
		36	inline floor (vec2d v)
		37	{
		38	return vec2d (fastfloor (v[0]), fastfloor (v[1]));
		39	}
35		40
		41	vec3d
		42	inline floor (vec3d v)
		43	{
		44	return vec3d (fastfloor (v[0]), fastfloor (v[1]), fastfloor (v[2]));
		45	}
		46
		47	vec2d
		48	inline pow (vec2d v, vec2d p)
		49	{
		50	return vec2d (pow (v[0], p[0]), pow (v[1], p[1]));
		51	}
		52
		53	/////////////////////////////////////////////////////////////////////////////
		54
		55	// various s-shaped curves, smooth to, first, or second derivative
		56	// used for smooth interpolation from 0..1
		57
		58	// linear
		59	template<typename T>
		60	inline T
		61	sigmoid0 (T x)
		62	{
		63	return x;
		64	}
		65
		66	// 3x²-2x³
		67	template<typename T>
		68	inline T
		69	sigmoid1 (T x)
		70	{
		71	return (3 - 2 * x) * x * x;
		72	}
		73
		74	// 6x⁵ - 15x⁴ + 10x³
		75	template<typename T>
		76	inline T
		77	sigmoid2 (T x)
		78	{
		79	#ifdef MORE_PARALLELITY
		80	float x2 = x * x;
		81	float x4 = x2 * x2;
		82
		83	return (6 * x4 + 10 * x2) * x - 15 * x4;
		84	#endif
		85
		86	// simple horner
		87	return ((6 * x - 15) * x + 10) * x * x * x;
		88	}
		89
		90	// blend between a and b
		91	// c is the control function - if lower than ca
		92	// then return a, if higher than cb, return b
		93	template<typename T, typename U>
		94	inline T
		95	blend (T a, T b, U c, U ca, U cb, U weight (U) = sigmoid1)
		96	{
		97	if (c <= ca) return a;
		98	if (c >= cb) return b;
		99
		100	U w = weight ((c - ca) / (cb - ca));
		101	return (U(1) - w) * a + w * b;
		102	}
		103
		104	// blend between a and b
		105	// c is the control function - if lower than -c_w
		106	// then return a, if higher than +c_w then b.
		107	template<typename T, typename U>
		108	inline T
		109	blend0 (T a, T b, U c, U c_w, U weight (U) = sigmoid1)
		110	{
		111	return blend<T,U> (a, b, c, -c_w, c_w, weight);
		112	}
		113
		114	template<class vec_t, int a, int b>
		115	struct rotate_nn
		116	{
		117	typename vec_t::T_numtype s, c;
		118
		119	void set (typename vec_t::T_numtype angle)
		120	{
		121	s = sin (angle);
		122	c = cos (angle);
		123	}
		124
		125	void operator ()(vec_t &P) const
		126	{
		127	vec_t o = P;
		128
		129	P[a] = o[a] * c - o[b] * s;
		130	P[b] = o[a] * s + o[b] * c;
		131	}
		132	};
		133
		134	template<class vec_t>
		135	struct rotate_xy : rotate_nn<vec_t, 0, 1>
		136	{
		137	};
		138
		139	template<class vec_t>
		140	struct rotate_xz : rotate_nn<vec_t, 0, 2>
		141	{
		142	};
		143
		144	template<class vec_t>
		145	struct rotate_yz : rotate_nn<vec_t, 1, 2>
		146	{
		147	};
		148
		149	/////////////////////////////////////////////////////////////////////////////
		150
36	template<int N, typename T = uint8_t>	151	template< int N, typename T>
37	struct permutation	152	struct permutation
38	{	153	{
39	T pmap[N];	154	T pmap[N];
40		155
41	template<class generator>	156	void seed (seedable_rand_gen &rng);
42	void seed (generator &rng)
43	{
44	for (int i = 0; i < N; ++i)
45	pmap[i] = i;
46		157
47	// fisher-yates to randomly perturb
48	for (int i = N; --i; )
49	::swap (pmap[i], pmap[rng (i + 1)]);
50	}
51
52	T operator ()(T v)	158	T operator ()(T v) func_pure
53	{	159	{
54	return pmap[v & (N - 1)];	160	return pmap[v & T(N - 1)];
55	}	161	}
		162	};
		163
		164	/////////////////////////////////////////////////////////////////////////////
		165
		166	template<class vec_t>
		167	struct noise_gen_base
		168	{
		169	permutation<256, uint8_t> rvmap[vec_t::numElements + 1];
		170
		171	typedef typename vec_t::T_numtype value_t;
		172
		173	void seed (seedable_rand_gen &rng);
		174	void seed (seed_t seed);
		175
		176	value_t operator ()(vec_t P, uint32_t seed = 0) func_pure;
56	};	177	};
57		178
58	template<class vec_t>	179	template<class vec_t>
59	struct noise_gen;	180	struct noise_gen;
60		181
61	// modelled after 2d/3d kensler noise without projection	182	// modelled after 2d/3d kensler noise without projection
62	template<>	183	template<>
63	struct noise_gen<vec2d>	184	struct noise_gen<vec2d>
		185	: noise_gen_base<vec2d>
64	{	186	{
65	permutation<256, uint8_t> rvmap[2];	187	static value_t abs_avg() { return 0.2231; } // avg(abs(noise))
66	vec2d rvec[256]; // random unit vectors
67
68	noise_gen<vec2d> (uint32_t seed);
69	vec2d::T_numtype operator() (vec2d P);
70	};	188	};
71		189
72	template<>	190	template<>
73	struct noise_gen<vec3d>	191	struct noise_gen<vec3d>
		192	: noise_gen_base<vec3d>
74	{	193	{
75	permutation<256, uint8_t> rvmap[3];	194	static vec3d::T_numtype abs_avg() { return 0.415; } // avg(abs(noise))
76		195
77	noise_gen<vec3d> (uint32_t seed);	196	using noise_gen_base<vec3d>::operator ();
78	vec2d::T_numtype operator() (vec3d P);
79		197
80	// noise projected on a surface with normal n	198	// noise projected on a surface with normal n
81	vec2d::T_numtype operator() (vec3d P, vec3d N);	199	vec2d::T_numtype operator() (vec3d P, vec3d N, uint32_t seed = 0) func_pure;
82	};	200	};
83		201
84	template<class vec_t, int a, int b>	202	typedef noise_gen<vec2d> noise2d;
85	struct rotate_nn	203	typedef noise_gen<vec3d> noise3d;
86	{
87	typename vec_t::T_numtype s, c;
88		204
89	void set (typename vec_t::T_numtype angle)	205	/////////////////////////////////////////////////////////////////////////////
90	{
91	s = sin (angle);
92	c = cos (angle);
93	}
94
95	void operator ()(vec_t &P) const
96	{
97	vec_t o = P;
98
99	P[a] = o[a] * c - o[b] * s;
100	P[b] = o[a] * s + o[b] * c;
101	}
102	};
103
104	template<class vec_t>
105	struct rotate_xy : rotate_nn<vec_t, 0, 1>
106	{
107	};
108
109	template<class vec_t>
110	struct rotate_xz : rotate_nn<vec_t, 0, 2>
111	{
112	};
113
114	template<class vec_t>
115	struct rotate_yz : rotate_nn<vec_t, 1, 2>
116	{
117	};
118		206
119	template<class vec_t>	207	template<class vec_t>
120	struct frac_gen	208	struct frac_gen
121	: noise_gen<vec_t>	209	: noise_gen<vec_t>
122	{	210	{
123	enum { MAX_OCTAVES = 64 };	211	enum { MAX_OCTAVES = 32 };
124		212
125	typedef typename vec_t::T_numtype value_t;	213	typedef typename vec_t::T_numtype value_t;
126		214
		215	int octaves;
127	value_t h, lac, ex[MAX_OCTAVES];	216	value_t h, lac, ex[MAX_OCTAVES];
128	value_t fbm_mul[MAX_OCTAVES];	217	value_t fbm_mul[MAX_OCTAVES];
129	rotate_xy<vec_t> rot[MAX_OCTAVES];	218	rotate_xy<vec_t> rot[MAX_OCTAVES];
130		219
131	value_t noise (vec_t P)	220	frac_gen (int octaves = 3, value_t lacunarity = 2, value_t hurst_expo = .5, uint32_t seed = 0);
		221
		222	value_t noise (vec_t P, uint32_t seed = 0) func_pure
132	{	223	{
133	return operator() (P);	224	return this->operator() (P, seed);
134	}	225	}
135		226
136	frac_gen (value_t hurst_expo = .5f, value_t lacunarity = 2.f);	227	value_t fBm (vec_t P) func_pure;
137
138	value_t fBm (vec_t P, int octaves);
139	value_t turbulence (vec_t P, int octaves);	228	value_t turbulence (vec_t P) func_pure;
140	value_t multifractal (vec_t P, int octaves, value_t offset = 1);	229	value_t multifractal (vec_t P, value_t offset = 1) func_pure;
141	value_t heterofractal (vec_t P, int octaves, value_t offset = 1);	230	value_t heterofractal (vec_t P, value_t offset = 1) func_pure;
142	value_t hybridfractal (vec_t P, int octaves, value_t offset = 1, value_t gain = 1);	231	value_t hybridfractal (vec_t P, value_t offset = 1, value_t gain = 1) func_pure;
143	value_t terrain (vec_t P, int octaves);
144	value_t terrain2 (vec_t P, int octaves);
145	value_t ridgedmultifractal (vec_t P, int octaves, value_t offset = 1, value_t gain = 8);	232	value_t ridgedmultifractal (vec_t P, value_t offset = 1, value_t gain = 8) func_pure;
		233	value_t billowfractal (vec_t P, value_t offset = 1, value_t gain = 2) func_pure;
		234	value_t terrain (vec_t P) func_pure;
		235	value_t terrain2 (vec_t P) func_pure;
146	};	236	};
		237
		238	typedef frac_gen<vec2d> frac2d;
		239	typedef frac_gen<vec3d> frac3d;
		240
		241	/////////////////////////////////////////////////////////////////////////////
		242
		243	template<typename T, typename U>
		244	inline T
		245	border_blend (T a, T b, vec2d P, U N, U W)
		246	{
		247	U border = W; // within n places of the border
		248
		249	min_it (border, P [0]);
		250	min_it (border, N - P [0]);
		251	min_it (border, P [1]);
		252	min_it (border, N - P [1]);
		253
		254	return blend (a, b, border, U(0), W);
		255	}
147		256
148	#endif	257	#endif
149		258

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing deliantra/server/include/noise.h (file contents): Revision 1.6 by root, Sat Apr 23 04:56:49 2011 UTC vs. Revision 1.17 by root, Wed Nov 28 17:41:45 2012 UTC

Diff Legend

Comparing deliantra/server/include/noise.h (file contents):
Revision 1.6 by root, Sat Apr 23 04:56:49 2011 UTC vs.
Revision 1.17 by root, Wed Nov 28 17:41:45 2012 UTC