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/* Copyright (C) 2013 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* 2D and 3D seamless Perlin noise
*/
// Based on http://www.cs.cmu.edu/~mzucker/code/perlin-noise-math-faq.html
// and http://mrl.nyu.edu/~perlin/paper445.pdf.
// Not optimized for speed yet.
#ifndef INCLUDED_NOISE
#define INCLUDED_NOISE
#include "Vector2D.h"
#include "Vector3D.h"
#include "MathUtil.h"
class Noise2D
{
NONCOPYABLE(Noise2D);
/// Frequency in X and Y
int freq;
/// freq*freq random gradient vectors in the unit cube
CVector2D** grads;
public:
Noise2D(int freq);
~Noise2D();
/// Evaluate the noise function at a given point
float operator() (float x, float y);
};
class Noise3D
{
NONCOPYABLE(Noise3D);
/// Frequency in X and Y
int freq;
/// Frequency in Z (vertical frequency)
int vfreq;
/// freq*freq*vfreq random gradient vectors in the unit cube
CVector3D*** grads;
public:
Noise3D(int freq, int vfreq);
~Noise3D();
/// Evaluate the noise function at a given point
float operator() (float x, float y, float z);
};
#endif
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