libcruft-util/noise/fractal/base.ipp

203 lines
5.1 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,
* WITHOUvalue_t 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 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifdef __UTIL_NOISE_FRACTAL_BASE_IPP
#error
#endif
#define __UTIL_NOISE_FRACTAL_BASE_IPP
#include <cmath>
namespace util { namespace noise { namespace fractal {
///////////////////////////////////////////////////////////////////////////
template <class B>
base<B>::base (seed_t _seed,
unsigned _octaves,
value_t _H,
value_t _frequency,
value_t _lacunarity,
value_t _amplitude,
value_t _gain):
// literals
m_octaves (_octaves),
m_H (_H),
m_frequency (_frequency),
m_lacunarity (_lacunarity),
m_amplitude (_amplitude),
m_gain (_gain),
// compound
m_basis (_seed),
// calculated
m_invAH (std::pow (_amplitude, -_H)),
m_invGH (std::pow (_gain, _H))
{
CHECK_NEQ (m_octaves, 0);
CHECK_NEQ (m_frequency, 0);
CHECK_NEQ (m_amplitude, 0);
}
///////////////////////////////////////////////////////////////////////////
template <class B>
unsigned
base<B>::octaves (unsigned _octaves)
{
return m_octaves = _octaves;
}
//-------------------------------------------------------------------------
template <class B>
constexpr unsigned
base<B>::octaves (void) const
{
return m_octaves;
}
//-------------------------------------------------------------------------
template <class B>
typename base<B>::value_t
base<B>::H (value_t _h)
{
m_H = _h;
m_invAH = std::pow (m_amplitude, -m_H);
m_invGH = std::pow (m_gain, m_H);
return m_H;
}
//-------------------------------------------------------------------------
template <class B>
constexpr typename base<B>::value_t
base<B>::H (void) const
{
return m_H;
}
//-------------------------------------------------------------------------
template <class B>
typename base<B>::value_t
base<B>::frequency (value_t _frequency)
{
return m_frequency = _frequency;
}
//-------------------------------------------------------------------------
template <class B>
constexpr typename base<B>::value_t
base<B>::frequency (void) const
{
return m_frequency;
}
//-------------------------------------------------------------------------
template <class B>
typename base<B>::value_t
base<B>::lacunarity (value_t _lacunarity)
{
return m_lacunarity = _lacunarity;
}
//-------------------------------------------------------------------------
template <class B>
constexpr typename base<B>::value_t
base<B>::lacunarity (void) const
{
return m_lacunarity;
}
//-------------------------------------------------------------------------
template <class B>
constexpr typename base<B>::value_t
base<B>::amplitude (void) const
{
return m_amplitude;
}
//-------------------------------------------------------------------------
template <class B>
typename base<B>::value_t
base<B>::amplitude (value_t _amplitude)
{
m_amplitude = _amplitude;
m_invAH = std::pow (m_amplitude, -m_H);
return m_amplitude;
}
//-------------------------------------------------------------------------
template <class B>
constexpr typename base<B>::value_t
base<B>::gain (void) const
{
return m_gain;
}
//-------------------------------------------------------------------------
template <class B>
typename base<B>::value_t
base<B>::gain (value_t _gain)
{
m_gain = _gain;
m_invGH = std::pow (_gain, m_H);
return m_gain;
}
//-------------------------------------------------------------------------
template <class B>
seed_t
base<B>::seed (seed_t _seed)
{
return m_basis.seed (_seed);
}
//-------------------------------------------------------------------------
template <class B>
seed_t
base<B>::seed (void) const
{
return m_basis.seed ();
}
//-------------------------------------------------------------------------
template <class B>
const B&
base<B>::basis (void) const
{
return m_basis;
}
//-------------------------------------------------------------------------
template <class B>
B&
base<B>::basis (void)
{
return m_basis;
}
} } }