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/*
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
#include "debug.h"
class PseudoRandom
{
public:
PseudoRandom(): m_next(0)
{
}
PseudoRandom(int seed): m_next(seed)
{
}
void seed(int seed)
{
m_next = seed;
}
// Returns 0...32767
int next()
{
m_next = m_next * 1103515245 + 12345;
return((unsigned)(m_next/65536) % 32768);
}
int range(int min, int max)
{
if(max-min > 32768/10)
{
//dstream<<"WARNING: PseudoRandom::range: max > 32767"<<std::endl;
assert(0);
}
if(min > max)
{
assert(0);
return max;
}
return (next()%(max-min+1))+min;
}
private:
int m_next;
};
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);
//bool contains(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
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