46 lines
1.5 KiB
C++
46 lines
1.5 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_BASIS_EXPGRAD_IPP
|
|
#error
|
|
#endif
|
|
#define __UTIL_NOISE_BASIS_EXPGRAD_IPP
|
|
|
|
#include "../rand.hpp"
|
|
|
|
|
|
namespace util { namespace noise { namespace basis {
|
|
///////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T, util::noise::lerp_t<T> L
|
|
>
|
|
expgrad<S,T,L>::expgrad (seed_t _seed, T _base, T _exponent):
|
|
gradient<S,T,L> (_seed),
|
|
m_base (_base),
|
|
m_exponent (_exponent)
|
|
{ ; }
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
template <size_t S, typename T, util::noise::lerp_t<T> L>
|
|
vector<S,T>
|
|
expgrad<S,T,L>::generate (pointi<S> p) const
|
|
{
|
|
auto t = (noise::rand<float> (this->seed (), p) + 1) / 2;
|
|
auto factor = std::pow (m_base, -t * m_exponent);
|
|
return factor * gradient<S,T,L>::generate (p);
|
|
}
|
|
} } }
|