/*
* Copyright (C) 2021 Christopher J. Howard
*
* This file is part of Antkeeper source code.
*
* Antkeeper source code 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 3 of the License, or
* (at your option) any later version.
*
* Antkeeper source code 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 Antkeeper source code. If not, see .
*/
#ifndef ANTKEEPER_MATH_NOISE_FBM_HPP
#define ANTKEEPER_MATH_NOISE_FBM_HPP
#include "math/vector.hpp"
#include
namespace math {
namespace noise {
/**
* Fractional Brownian motion (fBm).
*
* @tparam T Real type.
* @tparam N Number of dimensions.
*
* @param x n-dimensional input value.
* @param octaves Number of octaves.
* @param lacunarity Frequency multiplier.
* @param gain Amplitude multiplier.
* @param noise Noise function.
* @param hash Hash function.
*
*/
template
T fbm
(
vector x,
std::size_t octaves,
T lacunarity,
T gain,
T (*noise)(const vector&, std::uint32_t (*)(const vector&)),
std::uint32_t (*hash)(const vector&)
)
{
T amplitude{1};
T value{0};
while (octaves--)
{
value += noise(x, hash) * amplitude;
x *= lacunarity;
amplitude *= gain;
}
return value;
}
} // namespace noise
} // namespace math
#endif // ANTKEEPER_MATH_NOISE_FBM_HPP