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muSpectre/tests/test_fftw_engine.cc
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/**
* file test_fftw_engine.cc
*
* @author Till Junge <till.junge@epfl.ch>
*
* @date 05 Dec 2017
*
* @brief tests for the fftw fft engine implementation
*
* @section LICENCE
*
* Copyright © 2017 Till Junge
*
* µSpectre is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3, or (at
* your option) any later version.
*
* µSpectre 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Emacs; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <boost/mpl/list.hpp>
#include "tests.hh"
#include "fft/fftw_engine.hh"
#include "common/ccoord_operations.hh"
#include "common/field_collection.hh"
#include "common/field_map.hh"
#include "common/iterators.hh"
namespace muSpectre {
BOOST_AUTO_TEST_SUITE(fftw_engine);
/* ---------------------------------------------------------------------- */
template <Dim_t DimS, Dim_t DimM>
struct FFTW_fixture {
constexpr static Dim_t box_resolution{3};
constexpr static Real box_length{4.5};
constexpr static Dim_t sdim{DimS};
constexpr static Dim_t mdim{DimM};
FFTW_fixture() :engine(CcoordOps::get_cube<DimS>(box_resolution),
CcoordOps::get_cube<DimS>(box_length)){}
FFTW_Engine<DimS, DimM> engine;
};
using fixlist = boost::mpl::list<FFTW_fixture<twoD, twoD>,
FFTW_fixture<twoD, threeD>,
FFTW_fixture<threeD, threeD>>;
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(Constructor_test, Fix, fixlist, Fix) {
BOOST_CHECK_NO_THROW(Fix::engine.initialise(FFT_PlanFlags::estimate));
BOOST_CHECK_EQUAL(Fix::engine.size(), ipow(Fix::box_resolution, Fix::sdim));
}
/* ---------------------------------------------------------------------- */
BOOST_FIXTURE_TEST_CASE_TEMPLATE(fft_test, Fix, fixlist, Fix) {
Fix::engine.initialise(FFT_PlanFlags::estimate);
constexpr Dim_t order{2};
using FC_t = FieldCollection<Fix::sdim, Fix::mdim>;
FC_t fc;
auto & input{make_field<TensorField<FC_t, Real, order, Fix::mdim>>("input", fc)};
auto & ref {make_field<TensorField<FC_t, Real, order, Fix::mdim>>("reference", fc)};
auto & result{make_field<TensorField<FC_t, Real, order, Fix::mdim>>("result", fc)};
fc.initialise(CcoordOps::get_cube<Fix::sdim>(Fix::box_resolution));
using map_t = MatrixFieldMap<FC_t, Real, Fix::mdim, Fix::mdim>;
map_t inmap{input};
auto refmap{map_t{ref}};
auto resultmap{map_t{result}};
size_t cntr{0};
for (auto tup: akantu::zip(inmap, refmap)) {
cntr++;
auto & in_{std::get<0>(tup)};
auto & ref_{std::get<1>(tup)};
in_.setRandom();
ref_ = in_;
}
auto & complex_field = Fix::engine.fft(input);
using cmap_t = MatrixFieldMap<FieldCollection<Fix::sdim, Fix::mdim, false>, Complex, Fix::mdim, Fix::mdim>;
cmap_t complex_map(complex_field);
Real error = complex_map[0].imag().norm();
BOOST_CHECK_LT(error, tol);
/* make sure, the engine has not modified input (which is
unfortunately const-casted internally, hence this test) */
for (auto && tup: akantu::zip(inmap, refmap)) {
Real error{(std::get<0>(tup) - std::get<1>(tup)).norm()};
BOOST_CHECK_LT(error, tol);
}
/* make sure that the ifft of fft returns the original*/
Fix::engine.ifft(result);
for (auto && tup: akantu::zip(resultmap, refmap)) {
Real error{(std::get<0>(tup)*Fix::engine.normalisation() - std::get<1>(tup)).norm()};
BOOST_CHECK_LT(error, tol);
if (error > tol) {
std::cout << std::get<0>(tup).array()/std::get<1>(tup).array() << std::endl << std::endl;
}
}
}
BOOST_AUTO_TEST_SUITE_END();
} // muSpectre
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