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https://gitlab.kitware.com/vtk/vtk-m
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99ce66c6fe
Previously, all Fetch objects received an Invocation object in their Load and Store methods. The point of this was that it allowed the Fetch to get data from any of the execution objects. However, every Fetch either just got data directly from its associated execution object or else used a secondary execution object (the input domain) to get indices into their own execution object. This left two potential areas for improvement. First, pulling data out of the Invocation object was unnecessarily complicated. It would be much nicer to get data directly from the associated execution object. Second, when getting index information from the input domain, it was often the case that extra computations were necessary (particularly on structured cell sets). There was no way to share the index information among Fetches, and therefore the computations were replicated. This change removes the Invocation from the Fetch Load and Store. Instead, it passes the associated execution object and a new object type called the ThreadIndices. The ThreadIndices are customized for the input domain and therefore have all the information needed for a redirected lookup. It is also a thread-local object so it can cache computed indices and save on computation time.
102 lines
3.1 KiB
C++
102 lines
3.1 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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// 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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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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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/exec/internal/VecFromPortal.h>
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namespace vtkm {
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namespace exec {
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template<typename ShapePortalType,
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typename NumIndicesPortalType,
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typename ConnectivityPortalType,
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typename IndexOffsetPortalType
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>
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class ConnectivityExplicit
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{
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public:
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ConnectivityExplicit() {}
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ConnectivityExplicit(const ShapePortalType& shapePortal,
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const NumIndicesPortalType& numIndicesPortal,
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const ConnectivityPortalType& connPortal,
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const IndexOffsetPortalType& indexOffsetPortal
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)
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: Shapes(shapePortal),
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NumIndices(numIndicesPortal),
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Connectivity(connPortal),
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IndexOffset(indexOffsetPortal)
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{
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}
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VTKM_EXEC_EXPORT
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vtkm::Id GetNumberOfElements() const
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{
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return this->Shapes.GetNumberOfValues();
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}
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VTKM_EXEC_EXPORT
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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->NumIndices.Get(index));
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}
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typedef vtkm::CellShapeTagGeneric CellShapeTag;
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VTKM_EXEC_EXPORT
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CellShapeTag GetCellShape(vtkm::Id index) const
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{
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// Likewise, should Shapes be vtkm::Id or something smaller?
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return CellShapeTag(static_cast<vtkm::IdComponent>(this->Shapes.Get(index)));
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}
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typedef vtkm::exec::internal::VecFromPortal<ConnectivityPortalType>
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IndicesType;
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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_EXPORT
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IndicesType GetIndices(vtkm::Id index) const
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{
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vtkm::Id offset = this->IndexOffset.Get(index);
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vtkm::IdComponent length = this->GetNumberOfIndices(index);
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return IndicesType(this->Connectivity, length, offset);
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}
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private:
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ShapePortalType Shapes;
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NumIndicesPortalType NumIndices;
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ConnectivityPortalType Connectivity;
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IndexOffsetPortalType IndexOffset;
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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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