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

Comparing deliantra/server/include/noise.h (file contents):
Revision 1.5 by root, Sat Apr 23 04:46:26 2011 UTC vs.
Revision 1.18 by root, Sun Jun 9 21:19:12 2013 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 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	#if 1 // blitz++0.09
		27	#include <string.h> // workaround for tinyvec using memcpy without including string.h
		28	#include <cstdlib> // workaround for tinyvec using labs without including cstdlib
26	#include <blitz/tinyvec.h>	29	#include <blitz/tinyvec.h>
27	#include <blitz/tinyvec-et.h>	30	#include <blitz/tinyvec-et.h>
		31	#else
		32	// blitz++ 0.10 - not working
		33	#include <blitz/array.h>
		34	#include <blitz/tinyvec2.h>
		35	#endif
28		36
29	#include "global.h"	37	#include "global.h"
30		38
31	typedef blitz::TinyVector<float,2> vec2d;	39	typedef blitz::TinyVector<float,2> vec2d;
32	typedef blitz::TinyVector<float,3> vec3d;	40	typedef blitz::TinyVector<float,3> vec3d;
33		41
34	/////////////////////////////////////////////////////////////////////////////	42	vec2d
		43	inline floor (vec2d v)
		44	{
		45	return vec2d (fastfloor (v[0]), fastfloor (v[1]));
		46	}
35		47
		48	vec3d
		49	inline floor (vec3d v)
		50	{
		51	return vec3d (fastfloor (v[0]), fastfloor (v[1]), fastfloor (v[2]));
		52	}
		53
		54	vec2d
		55	inline pow (vec2d v, vec2d p)
		56	{
		57	return vec2d (pow (v[0], p[0]), pow (v[1], p[1]));
		58	}
		59
		60	/////////////////////////////////////////////////////////////////////////////
		61
		62	// various s-shaped curves, smooth to, first, or second derivative
		63	// used for smooth interpolation from 0..1
		64
		65	// linear
		66	template<typename T>
		67	inline T
		68	sigmoid0 (T x)
		69	{
		70	return x;
		71	}
		72
		73	// 3x²-2x³
		74	template<typename T>
		75	inline T
		76	sigmoid1 (T x)
		77	{
		78	return (3 - 2 * x) * x * x;
		79	}
		80
		81	// 6x⁵ - 15x⁴ + 10x³
		82	template<typename T>
		83	inline T
		84	sigmoid2 (T x)
		85	{
		86	#ifdef MORE_PARALLELITY
		87	float x2 = x * x;
		88	float x4 = x2 * x2;
		89
		90	return (6 * x4 + 10 * x2) * x - 15 * x4;
		91	#endif
		92
		93	// simple horner
		94	return ((6 * x - 15) * x + 10) * x * x * x;
		95	}
		96
		97	// blend between a and b
		98	// c is the control function - if lower than ca
		99	// then return a, if higher than cb, return b
		100	template<typename T, typename U>
		101	inline T
		102	blend (T a, T b, U c, U ca, U cb, U weight (U) = sigmoid1)
		103	{
		104	if (c <= ca) return a;
		105	if (c >= cb) return b;
		106
		107	U w = weight ((c - ca) / (cb - ca));
		108	return (U(1) - w) * a + w * b;
		109	}
		110
		111	// blend between a and b
		112	// c is the control function - if lower than -c_w
		113	// then return a, if higher than +c_w then b.
		114	template<typename T, typename U>
		115	inline T
		116	blend0 (T a, T b, U c, U c_w, U weight (U) = sigmoid1)
		117	{
		118	return blend<T,U> (a, b, c, -c_w, c_w, weight);
		119	}
		120
		121	template<class vec_t, int a, int b>
		122	struct rotate_nn
		123	{
		124	typename vec_t::T_numtype s, c;
		125
		126	void set (typename vec_t::T_numtype angle)
		127	{
		128	s = sin (angle);
		129	c = cos (angle);
		130	}
		131
		132	void operator ()(vec_t &P) const
		133	{
		134	vec_t o = P;
		135
		136	P[a] = o[a] * c - o[b] * s;
		137	P[b] = o[a] * s + o[b] * c;
		138	}
		139	};
		140
		141	template<class vec_t>
		142	struct rotate_xy : rotate_nn<vec_t, 0, 1>
		143	{
		144	};
		145
		146	template<class vec_t>
		147	struct rotate_xz : rotate_nn<vec_t, 0, 2>
		148	{
		149	};
		150
		151	template<class vec_t>
		152	struct rotate_yz : rotate_nn<vec_t, 1, 2>
		153	{
		154	};
		155
		156	/////////////////////////////////////////////////////////////////////////////
		157
36	template<int N, typename T = uint8_t>	158	template< int N, typename T>
37	struct permutation	159	struct permutation
38	{	160	{
39	T pmap[N];	161	T pmap[N];
40		162
41	template<class generator>	163	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		164
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)	165	T operator ()(T v) func_pure
53	{	166	{
54	return pmap[v & (N - 1)];	167	return pmap[v & T(N - 1)];
55	}	168	}
		169	};
		170
		171	/////////////////////////////////////////////////////////////////////////////
		172
		173	template<class vec_t>
		174	struct noise_gen_base
		175	{
		176	permutation<256, uint8_t> rvmap[vec_t::numElements + 1];
		177
		178	typedef typename vec_t::T_numtype value_t;
		179
		180	void seed (seedable_rand_gen &rng);
		181	void seed (seed_t seed);
		182
		183	value_t operator ()(vec_t P, uint32_t seed = 0) func_pure;
56	};	184	};
57		185
58	template<class vec_t>	186	template<class vec_t>
59	struct noise_gen;	187	struct noise_gen;
60		188
61	// modelled after 2d/3d kensler noise without projection	189	// modelled after 2d/3d kensler noise without projection
62	template<>	190	template<>
63	struct noise_gen<vec2d>	191	struct noise_gen<vec2d>
		192	: noise_gen_base<vec2d>
64	{	193	{
65	permutation<256, uint8_t> rvmap[2];	194	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	};	195	};
71		196
72	template<>	197	template<>
73	struct noise_gen<vec3d>	198	struct noise_gen<vec3d>
		199	: noise_gen_base<vec3d>
74	{	200	{
75	permutation<256, uint8_t> rvmap[3];	201	static vec3d::T_numtype abs_avg() { return 0.415; } // avg(abs(noise))
76		202
77	noise_gen<vec3d> (uint32_t seed);	203	using noise_gen_base<vec3d>::operator ();
78	vec2d::T_numtype operator() (vec3d P);
79		204
80	// noise projected on a surface with normal n	205	// noise projected on a surface with normal n
81	vec2d::T_numtype operator() (vec3d P, vec3d N);	206	vec2d::T_numtype operator() (vec3d P, vec3d N, uint32_t seed = 0) func_pure;
82	};	207	};
83		208
84	template<class vec_t, int a, int b>	209	typedef noise_gen<vec2d> noise2d;
85	struct rotate_nn	210	typedef noise_gen<vec3d> noise3d;
86	{
87	typename vec_t::T_numtype s, c;
88		211
89	void set (typename vec_t::T_numtype angle)	212	/////////////////////////////////////////////////////////////////////////////
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		213
119	template<class vec_t>	214	template<class vec_t>
120	struct frac_gen	215	struct frac_gen
121	: noise_gen<vec_t>	216	: noise_gen<vec_t>
122	{	217	{
123	enum { MAX_OCTAVES = 64 };	218	enum { MAX_OCTAVES = 32 };
124		219
125	typedef typename vec_t::T_numtype value_t;	220	typedef typename vec_t::T_numtype value_t;
126		221
		222	int octaves;
127	value_t h, lac, ex[MAX_OCTAVES];	223	value_t h, lac, ex[MAX_OCTAVES];
128	value_t fbm_mul[MAX_OCTAVES];	224	value_t fbm_mul[MAX_OCTAVES];
129	rotate_xy<vec_t> rot[MAX_OCTAVES];	225	rotate_xy<vec_t> rot[MAX_OCTAVES];
130		226
131	value_t noise (vec_t P)	227	frac_gen (int octaves = 3, value_t lacunarity = 2, value_t hurst_expo = .5, uint32_t seed = 0);
		228
		229	value_t noise (vec_t P, uint32_t seed = 0) func_pure
132	{	230	{
133	return operator() (P);	231	return this->operator() (P, seed);
134	}	232	}
135		233
136	frac_gen (value_t hurst_expo = .5f, value_t lacunarity = 2.f);	234	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);	235	value_t turbulence (vec_t P) func_pure;
140	value_t multifractal (vec_t P, int octaves, value_t offset = 1);	236	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);	237	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);	238	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);	239	value_t ridgedmultifractal (vec_t P, value_t offset = 1, value_t gain = 8) func_pure;
		240	value_t billowfractal (vec_t P, value_t offset = 1, value_t gain = 2) func_pure;
		241	value_t terrain (vec_t P) func_pure;
		242	value_t terrain2 (vec_t P) func_pure;
146	};	243	};
		244
		245	typedef frac_gen<vec2d> frac2d;
		246	typedef frac_gen<vec3d> frac3d;
		247
		248	/////////////////////////////////////////////////////////////////////////////
		249
		250	template<typename T, typename U>
		251	inline T
		252	border_blend (T a, T b, vec2d P, U N, U W)
		253	{
		254	U border = W; // within n places of the border
		255
		256	min_it (border, P [0]);
		257	min_it (border, N - P [0]);
		258	min_it (border, P [1]);
		259	min_it (border, N - P [1]);
		260
		261	return blend (a, b, border, U(0), W);
		262	}
147		263
148	#endif	264	#endif
149		265

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Comparing deliantra/server/include/noise.h (file contents): Revision 1.5 by root, Sat Apr 23 04:46:26 2011 UTC vs. Revision 1.18 by root, Sun Jun 9 21:19:12 2013 UTC

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Comparing deliantra/server/include/noise.h (file contents):
Revision 1.5 by root, Sat Apr 23 04:46:26 2011 UTC vs.
Revision 1.18 by root, Sun Jun 9 21:19:12 2013 UTC