1 /**************************************************************************/
2 /*  Copyright 2009 Tim Day                                                */
3 /*                                                                        */
4 /*  This file is part of Fracplanet                                       */
5 /*                                                                        */
6 /*  Fracplanet is free software: you can redistribute it and/or modify    */
7 /*  it under the terms of the GNU General Public License as published by  */
8 /*  the Free Software Foundation, either version 3 of the License, or     */
9 /*  (at your option) any later version.                                   */
10 /*                                                                        */
11 /*  Fracplanet 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 GNU General Public License     */
17 /*  along with Fracplanet.  If not, see <http://www.gnu.org/licenses/>.   */
18 /**************************************************************************/
19 
20 /*! \file
21   \brief Interface to Noise class.
22 */
23 
24 #ifndef _noise_h_
25 #define _noise_h_
26 
27 #include "common.h"
28 #include "xyz.h"
29 
30 //! Perlin noise generator.
31 class Noise
32 {
33 public:
34 
35   //! Constructor.
36   Noise(uint seed);
37 
38   //! Destructor.
39   ~Noise();
40 
41   //! Return noise value at a point.
42   float operator()(const XYZ& p) const;
43 
44 protected:
45 
46   //! Number of table entries.
47   enum {N=256};
48 
49   int _p[2*N+2];
50   XYZ _g[2*N+2];
51 };
52 
53 //! Multiscale noise generator.
54 class MultiscaleNoise
55 {
56  public:
57 
58   //! Constructor.
59   MultiscaleNoise(uint seed,uint terms,float decay);
60 
61   //! Destructor.
62   ~MultiscaleNoise();
63 
64   //! Return noise value at a point.
65   float operator()(const XYZ& p) const;
66 
67  private:
68 
69   //! Number of terms
70   const uint _terms;
71 
72   //! Noise functions for each frequency.
73   boost::scoped_array<boost::scoped_ptr<const Noise> > _noise;
74 
75   //! Amplitude for each frequency.
76   boost::scoped_array<float> _amplitude;
77 };
78 
79 #endif
80