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Diffstat (limited to 'misc/noise.h')
| -rw-r--r-- | misc/noise.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/misc/noise.h b/misc/noise.h new file mode 100644 index 000000000..59ca1bf94 --- /dev/null +++ b/misc/noise.h @@ -0,0 +1,108 @@ +/* +Minetest-c55 +Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com> + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 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 GNU General Public License along +with this program; if not, write to the Free Software Foundation, Inc., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ + +#ifndef NOISE_HEADER +#define NOISE_HEADER + +double easeCurve(double t); + +// Return value: -1 ... 1 +double noise2d(int x, int y, int seed); +double noise3d(int x, int y, int z, int seed); + +double noise2d_gradient(double x, double y, int seed); +double noise3d_gradient(double x, double y, double z, int seed); + +double noise2d_perlin(double x, double y, int seed, + int octaves, double persistence); + +double noise2d_perlin_abs(double x, double y, int seed, + int octaves, double persistence); + +double noise3d_perlin(double x, double y, double z, int seed, + int octaves, double persistence); + +double noise3d_perlin_abs(double x, double y, double z, int seed, + int octaves, double persistence); + +enum NoiseType +{ + NOISE_PERLIN, + NOISE_PERLIN_ABS, + NOISE_PERLIN_CONTOUR, + NOISE_PERLIN_CONTOUR_FLIP_YZ +}; + +struct NoiseParams +{ + NoiseType type; + int seed; + int octaves; + double persistence; + double pos_scale; + double noise_scale; // Useful for contour noises + + NoiseParams(NoiseType type_=NOISE_PERLIN, int seed_=0, + int octaves_=3, double persistence_=0.5, + double pos_scale_=100.0, double noise_scale_=1.0): + type(type_), + seed(seed_), + octaves(octaves_), + persistence(persistence_), + pos_scale(pos_scale_), + noise_scale(noise_scale_) + { + } +}; + +double noise3d_param(const NoiseParams ¶m, double x, double y, double z); + +class NoiseBuffer +{ +public: + NoiseBuffer(); + ~NoiseBuffer(); + + void clear(); + void create(const NoiseParams ¶m, + double first_x, double first_y, double first_z, + double last_x, double last_y, double last_z, + double samplelength_x, double samplelength_y, double samplelength_z); + void multiply(const NoiseParams ¶m); + // Deprecated + void create(int seed, int octaves, double persistence, + bool abs, + double first_x, double first_y, double first_z, + double last_x, double last_y, double last_z, + double samplelength_x, double samplelength_y, double samplelength_z); + + void intSet(int x, int y, int z, double d); + void intMultiply(int x, int y, int z, double d); + double intGet(int x, int y, int z); + double get(double x, double y, double z); + +private: + double *m_data; + double m_start_x, m_start_y, m_start_z; + double m_samplelength_x, m_samplelength_y, m_samplelength_z; + int m_size_x, m_size_y, m_size_z; +}; + +#endif + |