libcruft-util/noise/fractal/fbm.ipp
2015-06-02 16:17:44 +10:00

77 lines
2.2 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2012-2015 Danny Robson <danny@nerdcruft.net>
*/
#ifdef __UTIL_NOISE_FRACTAL_FBM_IPP
#error
#endif
#define __UTIL_NOISE_FRACTAL_FBM_IPP
#include "../../debug.hpp"
namespace util { namespace noise { namespace fractal {
///////////////////////////////////////////////////////////////////////////
template <typename T, typename B>
fbm<T,B>::fbm (seed_t _seed,
unsigned _octaves,
T _H,
T _frequency,
T _lacunarity,
T _amplitude,
T _gain):
base<T,B> (_seed,
_octaves,
_H,
_frequency,
_lacunarity,
_amplitude,
_gain)
{ ; }
//-------------------------------------------------------------------------
template <typename T, typename B>
fbm<T,B>::fbm (seed_t _seed):
fbm<T,B> (_seed,
DEFAULT_OCTAVES,
DEFAULT_H,
DEFAULT_FREQUENCY,
DEFAULT_LACUNARITY,
DEFAULT_AMPLITUDE,
DEFAULT_GAIN)
{ ; }
///////////////////////////////////////////////////////////////////////////
template <typename T, typename B>
constexpr T
fbm<T,B>::operator() (util::point<2,T> p) const
{
T total = 0;
T scale = this->m_invAH;
p *= this->m_frequency;
for (size_t i = 0; i < this->m_octaves; ++i) {
total += this->m_basis (p) * scale;
p *= this->m_lacunarity;
scale *= this->m_invGH;
}
return total;
}
} } }