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tamaas/src/surface/surface_generator_filter.cpp
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surface_generator_filter.cpp
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/**
* @file
* @section LICENSE
*
* Copyright (©) 2016-19 EPFL (École Polytechnique Fédérale de Lausanne),
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
/* -------------------------------------------------------------------------- */
#include "surface_generator_filter.hh"
#include "fft_plan_manager.hh"
#include "fftransform.hh"
#include <iostream>
/* -------------------------------------------------------------------------- */
namespace tamaas {
/* -------------------------------------------------------------------------- */
template <UInt dim>
void SurfaceGeneratorFilter<dim>::applyFilterOnSource() {
GridHermitian<Real, dim> fft_white_noise(this->filter_coefficients.sizes(),
1);
FFTransform<Real, dim>& wn_plan =
FFTPlanManager::get().createPlan(this->white_noise, fft_white_noise);
wn_plan.forwardTransform();
fft_white_noise *= filter_coefficients;
FFTransform<Real, dim>& surface_plan =
FFTPlanManager::get().createPlan(this->grid, fft_white_noise);
surface_plan.backwardTransform();
FFTPlanManager::get().destroyPlan(this->white_noise, fft_white_noise);
FFTPlanManager::get().destroyPlan(this->grid, fft_white_noise);
}
/* -------------------------------------------------------------------------- */
template <UInt dim>
Grid<Real, dim>& SurfaceGeneratorFilter<dim>::buildSurface() {
if (this->grid.dataSize() == 0)
TAMAAS_EXCEPTION("the size of the grid is zero, did you call setSizes() ?");
if (this->filter == nullptr)
TAMAAS_EXCEPTION("filter is null, did you call setFilter() ?");
// Resizing arrays
this->white_noise.resize(this->grid.sizes());
auto hermitian_dim =
GridHermitian<Real, dim>::hermitianDimensions(this->grid.sizes());
this->filter_coefficients.resize(hermitian_dim);
/// Generating white noise with gaussian distribution
this->generateWhiteNoise<normal_distribution<Real>>();
/// Applying filters
filter->computeFilter(this->filter_coefficients);
this->applyFilterOnSource();
/// Normalizing surface for hrms independent of number of points
this->grid *= std::sqrt(this->grid.dataSize());
return this->grid;
}
/* -------------------------------------------------------------------------- */
template class SurfaceGeneratorFilter<1>;
template class SurfaceGeneratorFilter<2>;
/* -------------------------------------------------------------------------- */
} // namespace tamaas
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