mirror of
https://gitlab.kitware.com/vtk/vtk-m
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75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_exec_arg_FromCount_h
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#define vtk_m_exec_arg_FromCount_h
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#include <vtkm/exec/arg/ExecutionSignatureTagBase.h>
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#include <vtkm/exec/arg/Fetch.h>
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#include <vtkm/exec/arg/ThreadIndicesTopologyMap.h>
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namespace vtkm
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{
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namespace exec
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{
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namespace arg
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{
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/// \brief Aspect tag to use for getting the from count.
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///
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/// The \c AspectTagFromCount aspect tag causes the \c Fetch class to obtain
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/// the number of indices that map to the current topology element.
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///
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struct AspectTagFromCount
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{
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};
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/// \brief The \c ExecutionSignature tag to get the number of from elements.
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///
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/// In a topology map, there are \em from and \em to topology elements
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/// specified. The scheduling occurs on the \em to elements, and for each \em
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/// to element there is some number of incident \em from elements that are
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/// accessible. This \c ExecutionSignature tag provides the number of these \em
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/// from elements that are accessible.
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///
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struct FromCount : vtkm::exec::arg::ExecutionSignatureTagBase
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{
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static constexpr vtkm::IdComponent INDEX = 1;
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using AspectTag = vtkm::exec::arg::AspectTagFromCount;
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};
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template <typename FetchTag, typename ConnectivityType, typename ExecObjectType>
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struct Fetch<FetchTag,
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vtkm::exec::arg::AspectTagFromCount,
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vtkm::exec::arg::ThreadIndicesTopologyMap<ConnectivityType>,
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ExecObjectType>
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{
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using ThreadIndicesType = vtkm::exec::arg::ThreadIndicesTopologyMap<ConnectivityType>;
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using ValueType = vtkm::IdComponent;
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VTKM_SUPPRESS_EXEC_WARNINGS
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VTKM_EXEC
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ValueType Load(const ThreadIndicesType& indices, const ExecObjectType&) const
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{
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return indices.GetIndicesFrom().GetNumberOfComponents();
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}
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VTKM_EXEC
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void Store(const ThreadIndicesType&, const ExecObjectType&, const ValueType&) const
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{
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// Store is a no-op.
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}
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};
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}
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}
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} // namespace vtkm::exec::arg
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#endif //vtk_m_exec_arg_FromCount_h
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