mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
d879188de0
Rather than force all dispatchers to be templated on a device adapter, instead use a TryExecute internally within the invoke to select a device adapter. Because this removes the need to declare a device when invoking a worklet, this commit also removes the need to declare a device in several other areas of the code.
280 lines
11 KiB
C++
280 lines
11 KiB
C++
//=============================================================================
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//
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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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// Copyright 2016 National Technology & Engineering Solutions of Sandia, LLC (NTESS).
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// Copyright 2016 UT-Battelle, LLC.
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// Copyright 2016 Los Alamos National Security.
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//
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// Under the terms of Contract DE-NA0003525 with NTESS,
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// the U.S. Government retains certain rights in this software.
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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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//=============================================================================
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#ifndef vtk_m_worklet_RemoveUnusedPoints_h
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#define vtk_m_worklet_RemoveUnusedPoints_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleConstant.h>
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#include <vtkm/cont/ArrayHandlePermutation.h>
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#include <vtkm/cont/CellSetExplicit.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <vtkm/worklet/ScatterCounting.h>
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#include <vtkm/worklet/WorkletMapField.h>
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namespace vtkm
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{
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namespace worklet
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{
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/// A collection of worklets used to identify which points are used by at least
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/// one cell and then remove the points that are not used by any cells. The
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/// class containing these worklets can be used to manage running these
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/// worklets, building new cell sets, and redefine field arrays.
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///
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class RemoveUnusedPoints
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{
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public:
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/// A worklet that creates a mask of used points (the first step in removing
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/// unused points). Given an array of point indices (taken from the
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/// connectivity of a CellSetExplicit) and an array mask initialized to 0,
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/// writes a 1 at the index of every point referenced by a cell.
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///
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struct GeneratePointMask : public vtkm::worklet::WorkletMapField
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{
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using ControlSignature = void(FieldIn<> pointIndices, WholeArrayInOut<> pointMask);
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using ExecutionSignature = void(_1, _2);
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template <typename PointMaskPortalType>
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VTKM_EXEC void operator()(vtkm::Id pointIndex, const PointMaskPortalType& pointMask) const
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{
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pointMask.Set(pointIndex, 1);
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}
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};
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/// A worklet that takes an array of point indices (taken from the
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/// connectivity of a CellSetExplicit) and an array that functions as a map
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/// from the original indices to new indices, creates a new array with the
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/// new mapped indices.
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///
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struct TransformPointIndices : public vtkm::worklet::WorkletMapField
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{
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using ControlSignature = void(FieldIn<IdType> pointIndex,
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WholeArrayIn<IdType> indexMap,
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FieldOut<IdType> mappedPoints);
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using ExecutionSignature = _3(_1, _2);
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template <typename IndexMapPortalType>
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VTKM_EXEC vtkm::Id operator()(vtkm::Id pointIndex, const IndexMapPortalType& indexPortal) const
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{
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return indexPortal.Get(pointIndex);
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}
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};
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public:
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VTKM_CONT
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RemoveUnusedPoints() {}
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template <typename ShapeStorage,
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typename NumIndicesStorage,
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typename ConnectivityStorage,
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typename OffsetsStorage,
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typename Device>
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VTKM_CONT RemoveUnusedPoints(const vtkm::cont::CellSetExplicit<ShapeStorage,
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NumIndicesStorage,
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ConnectivityStorage,
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OffsetsStorage>& inCellSet,
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Device)
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{
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this->FindPointsStart(Device());
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this->FindPoints(inCellSet, Device());
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this->FindPointsEnd(Device());
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}
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/// Get this class ready for identifying the points used by cell sets.
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///
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template <typename Device>
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VTKM_CONT void FindPointsStart(Device)
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{
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this->MaskArray.ReleaseResources();
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}
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/// Analyze the given cell set to find all points that are used. Unused
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/// points are those that are not found in any cell sets passed to this
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/// method.
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///
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template <typename ShapeStorage,
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typename NumIndicesStorage,
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typename ConnectivityStorage,
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typename OffsetsStorage,
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typename Device>
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VTKM_CONT void FindPoints(const vtkm::cont::CellSetExplicit<ShapeStorage,
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NumIndicesStorage,
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ConnectivityStorage,
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OffsetsStorage>& inCellSet,
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Device)
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{
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using Algorithm = vtkm::cont::DeviceAdapterAlgorithm<Device>;
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if (this->MaskArray.GetNumberOfValues() < 1)
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{
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// Initialize mask array to 0.
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Algorithm::Copy(
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vtkm::cont::ArrayHandleConstant<vtkm::IdComponent>(0, inCellSet.GetNumberOfPoints()),
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this->MaskArray);
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}
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VTKM_ASSERT(this->MaskArray.GetNumberOfValues() == inCellSet.GetNumberOfPoints());
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vtkm::worklet::DispatcherMapField<GeneratePointMask> dispatcher;
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dispatcher.SetDevice(Device());
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dispatcher.Invoke(inCellSet.GetConnectivityArray(vtkm::TopologyElementTagPoint(),
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vtkm::TopologyElementTagCell()),
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this->MaskArray);
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}
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/// Compile the information collected from calls to \c FindPointsInCellSet to
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/// ready this class for mapping cell sets and fields.
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///
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template <typename Device>
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VTKM_CONT void FindPointsEnd(Device)
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{
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this->PointScatter.reset(new vtkm::worklet::ScatterCounting(this->MaskArray, Device(), true));
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this->MaskArray.ReleaseResources();
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}
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/// \brief Map cell indices
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///
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/// Given a cell set (typically the same one passed to the constructor) and
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/// returns a new cell set with cell points transformed to use the indices of
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/// the new reduced point arrays.
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///
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template <typename ShapeStorage,
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typename NumIndicesStorage,
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typename ConnectivityStorage,
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typename OffsetsStorage,
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typename Device>
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VTKM_CONT vtkm::cont::CellSetExplicit<ShapeStorage,
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NumIndicesStorage,
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VTKM_DEFAULT_CONNECTIVITY_STORAGE_TAG,
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OffsetsStorage>
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MapCellSet(const vtkm::cont::CellSetExplicit<ShapeStorage,
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NumIndicesStorage,
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ConnectivityStorage,
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OffsetsStorage>& inCellSet,
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Device) const
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{
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using FromTopology = vtkm::TopologyElementTagPoint;
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using ToTopology = vtkm::TopologyElementTagCell;
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using NewConnectivityStorage = VTKM_DEFAULT_CONNECTIVITY_STORAGE_TAG;
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VTKM_ASSERT(this->PointScatter);
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vtkm::cont::ArrayHandle<vtkm::Id, NewConnectivityStorage> newConnectivityArray;
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vtkm::worklet::DispatcherMapField<TransformPointIndices> dispatcher;
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dispatcher.SetDevice(Device());
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dispatcher.Invoke(inCellSet.GetConnectivityArray(FromTopology(), ToTopology()),
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this->PointScatter->GetInputToOutputMap(),
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newConnectivityArray);
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vtkm::Id numberOfPoints = this->PointScatter->GetOutputToInputMap().GetNumberOfValues();
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vtkm::cont::
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CellSetExplicit<ShapeStorage, NumIndicesStorage, NewConnectivityStorage, OffsetsStorage>
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outCellSet(inCellSet.GetName());
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outCellSet.Fill(numberOfPoints,
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inCellSet.GetShapesArray(FromTopology(), ToTopology()),
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inCellSet.GetNumIndicesArray(FromTopology(), ToTopology()),
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newConnectivityArray,
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inCellSet.GetIndexOffsetArray(FromTopology(), ToTopology()));
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return outCellSet;
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}
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/// \brief Maps a point field from the original points to the new reduced points
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///
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/// Given an array handle that holds the values for a point field of the
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/// original data set, returns a new array handle containing field values
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/// rearranged to the new indices of the reduced point set.
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///
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/// This version of point mapping performs a shallow copy by using a
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/// permutation array.
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///
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template <typename InArrayHandle>
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VTKM_CONT vtkm::cont::ArrayHandlePermutation<vtkm::cont::ArrayHandle<vtkm::Id>, InArrayHandle>
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MapPointFieldShallow(const InArrayHandle& inArray) const
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{
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VTKM_ASSERT(this->PointScatter);
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return vtkm::cont::make_ArrayHandlePermutation(this->PointScatter->GetOutputToInputMap(),
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inArray);
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}
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/// \brief Maps a point field from the original points to the new reduced points
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///
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/// Given an array handle that holds the values for a point field of the
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/// original data set, returns a new array handle containing field values
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/// rearranged to the new indices of the reduced point set.
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///
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/// This version of point mapping performs a deep copy into the destination
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/// array provided.
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///
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template <typename InArrayHandle, typename OutArrayHandle, typename Device>
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VTKM_CONT void MapPointFieldDeep(const InArrayHandle& inArray,
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OutArrayHandle& outArray,
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Device) const
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{
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VTKM_IS_ARRAY_HANDLE(InArrayHandle);
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VTKM_IS_ARRAY_HANDLE(OutArrayHandle);
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VTKM_IS_DEVICE_ADAPTER_TAG(Device);
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using Algorithm = vtkm::cont::DeviceAdapterAlgorithm<Device>;
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Algorithm::Copy(this->MapPointFieldShallow(inArray), outArray);
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}
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/// \brief Maps a point field from the original points to the new reduced points
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///
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/// Given an array handle that holds the values for a point field of the
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/// original data set, returns a new array handle containing field values
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/// rearranged to the new indices of the reduced point set.
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///
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/// This version of point mapping performs a deep copy into an array that is
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/// returned.
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///
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template <typename InArrayHandle, typename Device>
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vtkm::cont::ArrayHandle<typename InArrayHandle::ValueType> MapPointFieldDeep(
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const InArrayHandle& inArray,
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Device) const
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{
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VTKM_IS_ARRAY_HANDLE(InArrayHandle);
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VTKM_IS_DEVICE_ADAPTER_TAG(Device);
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vtkm::cont::ArrayHandle<typename InArrayHandle::ValueType> outArray;
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this->MapPointFieldDeep(inArray, outArray, Device());
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return outArray;
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}
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private:
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vtkm::cont::ArrayHandle<vtkm::IdComponent> MaskArray;
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/// Manages how the original point indices map to the new point indices.
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///
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std::shared_ptr<vtkm::worklet::ScatterCounting> PointScatter;
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};
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}
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} // namespace vtkm::worklet
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#endif //vtk_m_worklet_RemoveUnusedPoints_h
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