77 lines
2.3 KiB
C++
77 lines
2.3 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>
|
||
|
*/
|
||
|
|
||
|
#include "hetero.hpp"
|
||
|
|
||
|
#include "../basis/constant.hpp"
|
||
|
#include "../basis/perlin.hpp"
|
||
|
#include "../basis/value.hpp"
|
||
|
#include "../basis/worley.hpp"
|
||
|
#include "../lerp.hpp"
|
||
|
|
||
|
using util::noise::fractal::hetero;
|
||
|
|
||
|
|
||
|
//-----------------------------------------------------------------------------
|
||
|
template <typename T, typename B>
|
||
|
hetero<T,B>::hetero():
|
||
|
H (0.75f),
|
||
|
octaves (6),
|
||
|
frequency (0.1f),
|
||
|
lacunarity (2),
|
||
|
offset (0.7f),
|
||
|
amplitude (1),
|
||
|
gain (1)
|
||
|
{ ; }
|
||
|
|
||
|
|
||
|
//-----------------------------------------------------------------------------
|
||
|
template <typename T, typename B>
|
||
|
T
|
||
|
hetero<T,B>::operator() (util::point<2,T> p) const
|
||
|
{
|
||
|
T exponents[octaves];
|
||
|
for (size_t i = 0; i < octaves; ++i)
|
||
|
exponents[i] = std::pow (std::pow (lacunarity, float (i)), -H);
|
||
|
|
||
|
T result = 0;
|
||
|
T increment = 0;
|
||
|
|
||
|
p *= frequency;
|
||
|
result = basis (p) + offset;
|
||
|
p *= lacunarity;
|
||
|
|
||
|
for (size_t i = 0; i < octaves; ++i) {
|
||
|
increment = basis (p) + offset;
|
||
|
increment *= exponents[i];
|
||
|
increment *= result;
|
||
|
|
||
|
result += increment;
|
||
|
|
||
|
p *= lacunarity;
|
||
|
}
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
|
||
|
//-----------------------------------------------------------------------------
|
||
|
template struct util::noise::fractal::hetero<float, util::noise::basis::worley<float>>;
|
||
|
template struct util::noise::fractal::hetero<float, util::noise::basis::perlin<float,util::lerp::linear>>;
|
||
|
template struct util::noise::fractal::hetero<float, util::noise::basis::perlin<float,util::lerp::quintic>>;
|
||
|
template struct util::noise::fractal::hetero<float, util::noise::basis::value<float,util::lerp::linear>>;
|
||
|
template struct util::noise::fractal::hetero<float, util::noise::basis::value<float,util::lerp::quintic>>;
|