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https://gitlab.kitware.com/vtk/vtk-m
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104 lines
3.7 KiB
C++
104 lines
3.7 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_ConnectivityExplicit_h
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#define vtk_m_exec_ConnectivityExplicit_h
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#include <vtkm/CellShape.h>
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#include <vtkm/Types.h>
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#include <vtkm/VecFromPortal.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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/// @brief A class holding information about topology connections.
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///
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/// An object of `ConnectivityExplicit` is provided to a worklet when the
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/// `ControlSignature` argument is `WholeCellSetIn` and the `vtkm::cont::CellSet`
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/// provided is a `vtkm::cont::CellSetExplicit`.
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template <typename ShapesPortalType, typename ConnectivityPortalType, typename OffsetsPortalType>
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class ConnectivityExplicit
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{
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public:
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using SchedulingRangeType = vtkm::Id;
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ConnectivityExplicit() {}
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ConnectivityExplicit(const ShapesPortalType& shapesPortal,
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const ConnectivityPortalType& connPortal,
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const OffsetsPortalType& offsetsPortal)
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: Shapes(shapesPortal)
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, Connectivity(connPortal)
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, Offsets(offsetsPortal)
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{
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}
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/// @brief Provides the number of elements in the topology.
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///
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/// This number of elements is associated with the "visit" type of topology element,
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/// which is the first template argument to `WholeCellSetIn`. The number of elements
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/// defines the valid indices for the other methods of this class.
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VTKM_EXEC
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SchedulingRangeType GetNumberOfElements() const { return this->Shapes.GetNumberOfValues(); }
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/// @brief The tag representing the cell shape of the visited elements.
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///
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/// The tag type is allways `vtkm::CellShapeTagGeneric` and its id is filled with the
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/// identifier for the appropriate shape.
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using CellShapeTag = vtkm::CellShapeTagGeneric;
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/// @brief Returns a tagfor the cell shape associated with the element at the given index.
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///
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/// The tag type is allways `vtkm::CellShapeTagGeneric` and its id is filled with the
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/// identifier for the appropriate shape.
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VTKM_EXEC
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CellShapeTag GetCellShape(vtkm::Id index) const { return CellShapeTag(this->Shapes.Get(index)); }
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/// Given the index of a visited element, returns the number of incident elements
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/// touching it.
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VTKM_EXEC
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vtkm::IdComponent GetNumberOfIndices(vtkm::Id index) const
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{
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return static_cast<vtkm::IdComponent>(this->Offsets.Get(index + 1) - this->Offsets.Get(index));
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}
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/// @brief Type of variable that lists of incident indices will be put into.
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using IndicesType = vtkm::VecFromPortal<ConnectivityPortalType>;
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/// Provides the indices of all elements incident to the visit element of the provided
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/// index.
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/// Returns a Vec-like object containing the indices for the given index.
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/// The object returned is not an actual array, but rather an object that
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/// loads the indices lazily out of the connectivity array. This prevents
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/// us from having to know the number of indices at compile time.
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///
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VTKM_EXEC
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IndicesType GetIndices(vtkm::Id index) const
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{
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const vtkm::Id offset = this->Offsets.Get(index);
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const vtkm::Id endOffset = this->Offsets.Get(index + 1);
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const auto length = static_cast<vtkm::IdComponent>(endOffset - offset);
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return IndicesType(this->Connectivity, length, offset);
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}
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private:
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ShapesPortalType Shapes;
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ConnectivityPortalType Connectivity;
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OffsetsPortalType Offsets;
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};
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} // namespace exec
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} // namespace vtkm
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#endif // vtk_m_exec_ConnectivityExplicit_h
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