server/include/noise.h

/*
 * This file is part of Deliantra, the Roguelike Realtime MMORPG.
 * 
 * Copyright (©) 2010 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
 * 
 * Deliantra is free software: you can redistribute it and/or modify it under
 * the terms of the Affero GNU General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at your
 * option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the Affero GNU General Public License
 * and the GNU General Public License along with this program. If not, see
 * <http://www.gnu.org/licenses/>.
 * 
 * The authors can be reached via e-mail to <support@deliantra.net>
 */

#ifndef NOISE_H_
#define NOISE_H_

#include "global.h"

template<int N, typename T = float>
struct gen_vec_base
{
  enum { D = N };
  T v[N];

  T &operator [](int n)
  {
    return v[n];
  }

  template<typename U>
  const gen_vec_base<N,T> &operator =(gen_vec_base<N,U> v)
  {
    for (int i = 0; i < N; ++i)
      this->v[i] = v.v[i];

    return *this;
  }
};

template<int N, typename T>
gen_vec_base<N,T> floor (gen_vec_base<N,T> v)
{
  for (int i = 0; i < N; ++i)
    v[i] = floor (v[i]);

  return v;
}

template<int N, typename T, typename U>
gen_vec_base<N,T> operator +(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
{
  gen_vec_base<N,T> c;

  for (int i = 0; i < N; ++i)
    c[i] = a[i] + b[i];

  return c;
}

template<int N, typename T, typename U>
gen_vec_base<N,T> operator -(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
{
  gen_vec_base<N,T> c;

  for (int i = 0; i < N; ++i)
    c[i] = a[i] - b[i];

  return c;
}

template<int N, typename T, typename U>
T operator *(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
{
  T v = 0;

  for (int i = 0; i < N; ++i)
    v += a[i] * b[i];

  return v;
}

template<int N, typename T = float>
struct gen_vec;

template<typename T>
struct gen_vec<2,T> : gen_vec_base<2,T>
{
  using gen_vec_base<2,T>::operator =;

  gen_vec ()
  {
  }

  gen_vec (T x, T y)
  {
    this->v[0] = x;
    this->v[1] = y;
  }

  template<typename U>
  gen_vec (gen_vec_base<2,U> v)
  {
    *this = v;
  }
};

template<typename T>
struct gen_vec<3,T> : gen_vec_base<3,T>
{
  gen_vec ()
  {
  }

  gen_vec (T x, T y, T z)
  {
    this->v[0] = x;
    this->v[1] = y;
    this->v[2] = z;
  }

  template<typename U>
  gen_vec (gen_vec_base<3,U> v)
  {
    *this = v;
  }
};

typedef gen_vec<2> vec2d;
typedef gen_vec<3> vec3d;

template<int N, typename T = float>
struct space
{
  enum { D = N };
  typedef gen_vec<N,T> vec;
};

typedef space<2> space2d;
typedef space<3> space3d;

/////////////////////////////////////////////////////////////////////////////

template<int N, typename T = uint8_t>
struct permutation
{
  T pmap [N];

  template<class generator>
  void seed (generator &rng)
  {
    for (int i = 0; i < N; ++i)
      pmap [i] = i;

    // fisher-yates to randomly perturb
    for (int i = N; --i; )
      ::swap (pmap [i], pmap [::rmg_rndm (i + 1)]);
  }

  T operator ()(T v)
  {
    return pmap [v & (N - 1)];
  }
};

// modelled after 2d/3d kensler noise without projection
struct noise2d
{
  permutation<256, uint8_t> rvmap[2];
  vec2d rvec[256]; // random unit vectors

  noise2d (uint32_t seed);
  float noise (float x, float y);
};

struct noise3d
{
  permutation<256, uint8_t> rvmap[3];
  float rvec[256][3]; // random unit vectors

  noise3d (uint32_t seed);
  float noise (float x, float y, float z);

  // noise projected on a surface with normal n
  float noise (float x, float y, float z, float nx, float ny, float nz);
};

struct rotate
{
  float s, c;

  void set (float angle)
  {
    s = sinf (angle);
    c = cosf (angle);
  }

  void operator ()(float &x, float &y) const
  {
    float xr = x * c - y * s;
    float yr = x * s + y * c;

    x = xr;
    y = yr;
  }
};

struct frac_gen
: noise2d
{
  enum { MAX_OCTAVES = 64 };

  float h, lac, ex [MAX_OCTAVES];
  float fbm_mul [MAX_OCTAVES];
  rotate rot [MAX_OCTAVES];

  frac_gen (float hurst_expo = .5f, float lacunarity = 2.f);

  float fBm (float x, float y, int octaves);
  float turbulence (float x, float y, int octaves);
  float multifractal (float x, float y, int octaves, float offset = 1);
  float heterofractal (float x, float y, int octaves, float offset = 1);
  float hybridfractal (float x, float y, int octaves, float offset = 1, float gain = 1);
  float terrain (float x, float y, int octaves);
  float terrain2 (float x, float y, int octaves);
  float ridgedmultifractal (float x, float y, int octaves, float offset = 1, float gain = 8);
};

#endif
Revision:	1.4
Committed:	Fri Apr 22 07:56:47 2011 UTC (13 years, 1 month ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+2 -2 lines
Log Message:	* empty log message *
#	Content
1	/*
2	* This file is part of Deliantra, the Roguelike Realtime MMORPG.
3	*
4	* Copyright (©) 2010 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 "global.h"
27
28	template<int N, typename T = float>
29	struct gen_vec_base
30	{
31	enum { D = N };
32	T v[N];
33
34	T &operator [](int n)
35	{
36	return v[n];
37	}
38
39	template<typename U>
40	const gen_vec_base<N,T> &operator =(gen_vec_base<N,U> v)
41	{
42	for (int i = 0; i < N; ++i)
43	this->v[i] = v.v[i];
44
45	return *this;
46	}
47	};
48
49	template<int N, typename T>
50	gen_vec_base<N,T> floor (gen_vec_base<N,T> v)
51	{
52	for (int i = 0; i < N; ++i)
53	v[i] = floor (v[i]);
54
55	return v;
56	}
57
58	template<int N, typename T, typename U>
59	gen_vec_base<N,T> operator +(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
60	{
61	gen_vec_base<N,T> c;
62
63	for (int i = 0; i < N; ++i)
64	c[i] = a[i] + b[i];
65
66	return c;
67	}
68
69	template<int N, typename T, typename U>
70	gen_vec_base<N,T> operator -(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
71	{
72	gen_vec_base<N,T> c;
73
74	for (int i = 0; i < N; ++i)
75	c[i] = a[i] - b[i];
76
77	return c;
78	}
79
80	template<int N, typename T, typename U>
81	T operator *(gen_vec_base<N,T> a, gen_vec_base<N,U> b)
82	{
83	T v = 0;
84
85	for (int i = 0; i < N; ++i)
86	v += a[i] * b[i];
87
88	return v;
89	}
90
91	template<int N, typename T = float>
92	struct gen_vec;
93
94	template<typename T>
95	struct gen_vec<2,T> : gen_vec_base<2,T>
96	{
97	using gen_vec_base<2,T>::operator =;
98
99	gen_vec ()
100	{
101	}
102
103	gen_vec (T x, T y)
104	{
105	this->v[0] = x;
106	this->v[1] = y;
107	}
108
109	template<typename U>
110	gen_vec (gen_vec_base<2,U> v)
111	{
112	*this = v;
113	}
114	};
115
116	template<typename T>
117	struct gen_vec<3,T> : gen_vec_base<3,T>
118	{
119	gen_vec ()
120	{
121	}
122
123	gen_vec (T x, T y, T z)
124	{
125	this->v[0] = x;
126	this->v[1] = y;
127	this->v[2] = z;
128	}
129
130	template<typename U>
131	gen_vec (gen_vec_base<3,U> v)
132	{
133	*this = v;
134	}
135	};
136
137	typedef gen_vec<2> vec2d;
138	typedef gen_vec<3> vec3d;
139
140	template<int N, typename T = float>
141	struct space
142	{
143	enum { D = N };
144	typedef gen_vec<N,T> vec;
145	};
146
147	typedef space<2> space2d;
148	typedef space<3> space3d;
149
150	/////////////////////////////////////////////////////////////////////////////
151
152	template<int N, typename T = uint8_t>
153	struct permutation
154	{
155	T pmap [N];
156
157	template<class generator>
158	void seed (generator &rng)
159	{
160	for (int i = 0; i < N; ++i)
161	pmap [i] = i;
162
163	// fisher-yates to randomly perturb
164	for (int i = N; --i; )
165	::swap (pmap [i], pmap [::rmg_rndm (i + 1)]);
166	}
167
168	T operator ()(T v)
169	{
170	return pmap [v & (N - 1)];
171	}
172	};
173
174	// modelled after 2d/3d kensler noise without projection
175	struct noise2d
176	{
177	permutation<256, uint8_t> rvmap[2];
178	vec2d rvec[256]; // random unit vectors
179
180	noise2d (uint32_t seed);
181	float noise (float x, float y);
182	};
183
184	struct noise3d
185	{
186	permutation<256, uint8_t> rvmap[3];
187	float rvec[256][3]; // random unit vectors
188
189	noise3d (uint32_t seed);
190	float noise (float x, float y, float z);
191
192	// noise projected on a surface with normal n
193	float noise (float x, float y, float z, float nx, float ny, float nz);
194	};
195
196	struct rotate
197	{
198	float s, c;
199
200	void set (float angle)
201	{
202	s = sinf (angle);
203	c = cosf (angle);
204	}
205
206	void operator ()(float &x, float &y) const
207	{
208	float xr = x * c - y * s;
209	float yr = x * s + y * c;
210
211	x = xr;
212	y = yr;
213	}
214	};
215
216	struct frac_gen
217	: noise2d
218	{
219	enum { MAX_OCTAVES = 64 };
220
221	float h, lac, ex [MAX_OCTAVES];
222	float fbm_mul [MAX_OCTAVES];
223	rotate rot [MAX_OCTAVES];
224
225	frac_gen (float hurst_expo = .5f, float lacunarity = 2.f);
226
227	float fBm (float x, float y, int octaves);
228	float turbulence (float x, float y, int octaves);
229	float multifractal (float x, float y, int octaves, float offset = 1);
230	float heterofractal (float x, float y, int octaves, float offset = 1);
231	float hybridfractal (float x, float y, int octaves, float offset = 1, float gain = 1);
232	float terrain (float x, float y, int octaves);
233	float terrain2 (float x, float y, int octaves);
234	float ridgedmultifractal (float x, float y, int octaves, float offset = 1, float gain = 8);
235	};
236
237	#endif