mirror of https://github.com/minetest/minetest.git
150 lines
3.6 KiB
C++
150 lines
3.6 KiB
C++
/*
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Minetest-c55
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Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef NOISE_HEADER
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#define NOISE_HEADER
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#include "debug.h"
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class PseudoRandom
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{
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public:
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PseudoRandom(): m_next(0)
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{
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}
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PseudoRandom(int seed): m_next(seed)
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{
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}
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void seed(int seed)
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{
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m_next = seed;
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}
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// Returns 0...32767
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int next()
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{
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m_next = m_next * 1103515245 + 12345;
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return((unsigned)(m_next/65536) % 32768);
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}
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int range(int min, int max)
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{
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if(max-min > 32768/10)
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{
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//dstream<<"WARNING: PseudoRandom::range: max > 32767"<<std::endl;
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assert(0);
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}
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if(min > max)
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{
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assert(0);
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return max;
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}
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return (next()%(max-min+1))+min;
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}
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private:
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int m_next;
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};
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double easeCurve(double t);
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// Return value: -1 ... 1
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double noise2d(int x, int y, int seed);
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double noise3d(int x, int y, int z, int seed);
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double noise2d_gradient(double x, double y, int seed);
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double noise3d_gradient(double x, double y, double z, int seed);
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double noise2d_perlin(double x, double y, int seed,
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int octaves, double persistence);
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double noise2d_perlin_abs(double x, double y, int seed,
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int octaves, double persistence);
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double noise3d_perlin(double x, double y, double z, int seed,
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int octaves, double persistence);
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double noise3d_perlin_abs(double x, double y, double z, int seed,
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int octaves, double persistence);
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enum NoiseType
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{
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NOISE_CONSTANT_ONE,
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NOISE_PERLIN,
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NOISE_PERLIN_ABS,
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NOISE_PERLIN_CONTOUR,
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NOISE_PERLIN_CONTOUR_FLIP_YZ,
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};
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struct NoiseParams
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{
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NoiseType type;
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int seed;
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int octaves;
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double persistence;
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double pos_scale;
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double noise_scale; // Useful for contour noises
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NoiseParams(NoiseType type_=NOISE_PERLIN, int seed_=0,
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int octaves_=3, double persistence_=0.5,
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double pos_scale_=100.0, double noise_scale_=1.0):
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type(type_),
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seed(seed_),
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octaves(octaves_),
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persistence(persistence_),
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pos_scale(pos_scale_),
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noise_scale(noise_scale_)
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{
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}
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};
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double noise3d_param(const NoiseParams ¶m, double x, double y, double z);
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class NoiseBuffer
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{
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public:
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NoiseBuffer();
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~NoiseBuffer();
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void clear();
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void create(const NoiseParams ¶m,
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double first_x, double first_y, double first_z,
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double last_x, double last_y, double last_z,
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double samplelength_x, double samplelength_y, double samplelength_z);
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void multiply(const NoiseParams ¶m);
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// Deprecated
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void create(int seed, int octaves, double persistence,
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bool abs,
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double first_x, double first_y, double first_z,
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double last_x, double last_y, double last_z,
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double samplelength_x, double samplelength_y, double samplelength_z);
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void intSet(int x, int y, int z, double d);
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void intMultiply(int x, int y, int z, double d);
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double intGet(int x, int y, int z);
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double get(double x, double y, double z);
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//bool contains(double x, double y, double z);
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private:
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double *m_data;
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double m_start_x, m_start_y, m_start_z;
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double m_samplelength_x, m_samplelength_y, m_samplelength_z;
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int m_size_x, m_size_y, m_size_z;
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};
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#endif
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