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Make integrals a host function (#620)
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| // Copyright (C) The DDC development team, see COPYRIGHT.md file | ||
| // | ||
| // SPDX-License-Identifier: MIT | ||
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| #pragma once | ||
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| #include <ddc/ddc.hpp> | ||
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| #include "bsplines_non_uniform.hpp" | ||
| #include "bsplines_uniform.hpp" | ||
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| namespace ddc { | ||
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| namespace detail { | ||
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| /** @brief Compute the integrals of the uniform B-splines. | ||
| * | ||
| * The integral of each of the B-splines over their support within the domain on which this basis was defined. | ||
| * | ||
| * @param[in] execution_space a Kokkos execution space where the loop will be executed on | ||
| * @param[out] int_vals The values of the integrals. It has to be a 1D Chunkspan of size (nbasis). | ||
| */ | ||
| template <class ExecSpace, class DDim, class Layout, class MemorySpace> | ||
| void uniform_bsplines_integrals( | ||
| ExecSpace const& execution_space, | ||
| ddc::ChunkSpan<double, ddc::DiscreteDomain<DDim>, Layout, MemorySpace> int_vals) | ||
| { | ||
| static_assert(is_uniform_bsplines_v<DDim>); | ||
| static_assert( | ||
| Kokkos::SpaceAccessibility<ExecSpace, MemorySpace>::accessible, | ||
| "MemorySpace has to be accessible for ExecutionSpace."); | ||
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| if constexpr (DDim::is_periodic()) { | ||
| assert(int_vals.size() == ddc::discrete_space<DDim>().nbasis() | ||
| || int_vals.size() == ddc::discrete_space<DDim>().size()); | ||
| } else { | ||
| assert(int_vals.size() == ddc::discrete_space<DDim>().nbasis()); | ||
| } | ||
| ddc::DiscreteDomain<DDim> const full_dom_splines(ddc::discrete_space<DDim>().full_domain()); | ||
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| if constexpr (DDim::is_periodic()) { | ||
| ddc::DiscreteDomain<DDim> const dom_bsplines(full_dom_splines.take_first( | ||
| ddc::DiscreteVector<DDim> {ddc::discrete_space<DDim>().nbasis()})); | ||
| ddc::parallel_fill( | ||
| execution_space, | ||
| int_vals[dom_bsplines], | ||
| ddc::step<UniformBsplinesKnots<DDim>>()); | ||
| if (int_vals.size() == ddc::discrete_space<DDim>().size()) { | ||
| ddc::DiscreteDomain<DDim> const dom_bsplines_repeated( | ||
| full_dom_splines.take_last(ddc::DiscreteVector<DDim> {DDim::degree()})); | ||
| ddc::parallel_fill(execution_space, int_vals[dom_bsplines_repeated], 0); | ||
| } | ||
| } else { | ||
| ddc::DiscreteDomain<DDim> const dom_bspline_entirely_in_domain | ||
| = full_dom_splines | ||
| .remove(ddc::DiscreteVector<DDim>(DDim::degree()), | ||
| ddc::DiscreteVector<DDim>(DDim::degree())); | ||
| ddc::parallel_fill( | ||
| execution_space, | ||
| int_vals[dom_bspline_entirely_in_domain], | ||
| ddc::step<UniformBsplinesKnots<DDim>>()); | ||
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| ddc::DiscreteElement<DDim> const first_bspline = full_dom_splines.front(); | ||
| ddc::DiscreteElement<DDim> const last_bspline = full_dom_splines.back(); | ||
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| Kokkos::parallel_for( | ||
| Kokkos::RangePolicy< | ||
| ExecSpace, | ||
| Kokkos::IndexType<std::size_t>>(execution_space, 0, DDim::degree()), | ||
| KOKKOS_LAMBDA(std::size_t i) { | ||
| std::array<double, DDim::degree() + 2> edge_vals_ptr; | ||
| std::experimental::mdspan< | ||
| double, | ||
| std::experimental::extents<std::size_t, DDim::degree() + 2>> const | ||
| edge_vals(edge_vals_ptr.data()); | ||
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| ddc::discrete_space<DDim>().eval_basis( | ||
| edge_vals, | ||
| ddc::discrete_space<DDim>().rmin(), | ||
| DDim::degree() + 1); | ||
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| double const d_eval = ddc::detail::sum(edge_vals); | ||
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| double const c_eval = ddc::detail::sum(edge_vals, 0, DDim::degree() - i); | ||
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| double const edge_value | ||
| = ddc::step<UniformBsplinesKnots<DDim>>() * (d_eval - c_eval); | ||
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| int_vals(first_bspline + i) = edge_value; | ||
| int_vals(last_bspline - i) = edge_value; | ||
| }); | ||
| } | ||
| } | ||
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| /** @brief Compute the integrals of the non uniform B-splines. | ||
| * | ||
| * The integral of each of the B-splines over their support within the domain on which this basis was defined. | ||
| * | ||
| * @param[in] execution_space a Kokkos execution space where the loop will be executed on | ||
| * @param[out] int_vals The values of the integrals. It has to be a 1D Chunkspan of size (nbasis). | ||
| */ | ||
| template <class ExecSpace, class DDim, class Layout, class MemorySpace> | ||
| void non_uniform_bsplines_integrals( | ||
| ExecSpace const& execution_space, | ||
| ddc::ChunkSpan<double, ddc::DiscreteDomain<DDim>, Layout, MemorySpace> int_vals) | ||
| { | ||
| static_assert(is_non_uniform_bsplines_v<DDim>); | ||
| static_assert( | ||
| Kokkos::SpaceAccessibility<ExecSpace, MemorySpace>::accessible, | ||
| "MemorySpace has to be accessible for ExecutionSpace."); | ||
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| if constexpr (DDim::is_periodic()) { | ||
| assert(int_vals.size() == ddc::discrete_space<DDim>().nbasis() | ||
| || int_vals.size() == ddc::discrete_space<DDim>().size()); | ||
| } else { | ||
| assert(int_vals.size() == ddc::discrete_space<DDim>().nbasis()); | ||
| } | ||
| ddc::DiscreteDomain<DDim> const full_dom_splines(ddc::discrete_space<DDim>().full_domain()); | ||
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| double const inv_deg = 1.0 / (DDim::degree() + 1); | ||
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| ddc::DiscreteDomain<DDim> const dom_bsplines(full_dom_splines.take_first( | ||
| ddc::DiscreteVector<DDim> {ddc::discrete_space<DDim>().nbasis()})); | ||
| ddc::parallel_for_each( | ||
| execution_space, | ||
| dom_bsplines, | ||
| KOKKOS_LAMBDA(ddc::DiscreteElement<DDim> ix) { | ||
| int_vals(ix) | ||
| = (ddc::coordinate(ddc::discrete_space<DDim>().get_last_support_knot(ix)) | ||
| - ddc::coordinate( | ||
| ddc::discrete_space<DDim>().get_first_support_knot(ix))) | ||
| * inv_deg; | ||
| }); | ||
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| if constexpr (DDim::is_periodic()) { | ||
| if (int_vals.size() == ddc::discrete_space<DDim>().size()) { | ||
| ddc::DiscreteDomain<DDim> const dom_bsplines_wrap( | ||
| full_dom_splines.take_last(ddc::DiscreteVector<DDim> {DDim::degree()})); | ||
| ddc::parallel_fill(execution_space, int_vals[dom_bsplines_wrap], 0); | ||
| } | ||
| } | ||
| } | ||
|
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| } // namespace detail | ||
|
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| /** @brief Compute the integrals of the B-splines. | ||
| * | ||
| * The integral of each of the B-splines over their support within the domain on which this basis was defined. | ||
| * | ||
| * @param[in] execution_space a Kokkos execution space where the loop will be executed on | ||
| * @param[out] int_vals The values of the integrals. It has to be a 1D Chunkspan of size (nbasis). | ||
| * @return The values of the integrals. | ||
| */ | ||
| template <class ExecSpace, class DDim, class Layout, class MemorySpace> | ||
| ddc::ChunkSpan<double, ddc::DiscreteDomain<DDim>, Layout, MemorySpace> integrals( | ||
| ExecSpace const& execution_space, | ||
| ddc::ChunkSpan<double, ddc::DiscreteDomain<DDim>, Layout, MemorySpace> int_vals) | ||
| { | ||
| static_assert(is_uniform_bsplines_v<DDim> || is_non_uniform_bsplines_v<DDim>); | ||
| if constexpr (is_uniform_bsplines_v<DDim>) { | ||
| uniform_bsplines_integrals(execution_space, int_vals); | ||
| } else if constexpr (is_non_uniform_bsplines_v<DDim>) { | ||
| non_uniform_bsplines_integrals(execution_space, int_vals); | ||
| } | ||
| return int_vals; | ||
| } | ||
|
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| } // namespace ddc |
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