mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
129 lines
4.6 KiB
C++
129 lines
4.6 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_worklet_TetrahedralizeStructured_h
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#define vtk_m_worklet_TetrahedralizeStructured_h
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleGroupVec.h>
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#include <vtkm/cont/CellSetSingleType.h>
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#include <vtkm/cont/CellSetStructured.h>
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#include <vtkm/cont/DataSet.h>
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#include <vtkm/cont/DeviceAdapter.h>
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#include <vtkm/cont/DynamicArrayHandle.h>
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#include <vtkm/cont/ErrorBadValue.h>
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#include <vtkm/cont/Field.h>
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#include <vtkm/worklet/DispatcherMapTopology.h>
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#include <vtkm/worklet/ScatterUniform.h>
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#include <vtkm/worklet/WorkletMapTopology.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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namespace detail
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{
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VTKM_EXEC_CONSTANT
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const static vtkm::IdComponent StructuredTetrahedronIndices[2][5][4] = {
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{ { 0, 1, 3, 4 }, { 1, 4, 5, 6 }, { 1, 4, 6, 3 }, { 1, 3, 6, 2 }, { 3, 6, 7, 4 } },
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{ { 2, 1, 5, 0 }, { 0, 2, 3, 7 }, { 2, 5, 6, 7 }, { 0, 7, 4, 5 }, { 0, 2, 7, 5 } }
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};
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} // namespace detail
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/// \brief Compute the tetrahedralize cells for a uniform grid data set
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template <typename DeviceAdapter>
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class TetrahedralizeStructured
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{
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public:
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TetrahedralizeStructured() {}
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//
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// Worklet to turn hexahedra into tetrahedra
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// Vertices remain the same and each cell is processed with needing topology
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//
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class TetrahedralizeCell : public vtkm::worklet::WorkletMapPointToCell
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{
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public:
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typedef void ControlSignature(CellSetIn cellset, FieldOutCell<> connectivityOut);
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typedef void ExecutionSignature(PointIndices, _2, ThreadIndices);
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typedef _1 InputDomain;
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typedef vtkm::worklet::ScatterUniform ScatterType;
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VTKM_CONT
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ScatterType GetScatter() const { return ScatterType(5); }
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VTKM_CONT
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TetrahedralizeCell() {}
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// Each hexahedron cell produces five tetrahedron cells
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template <typename ConnectivityInVec, typename ConnectivityOutVec, typename ThreadIndicesType>
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VTKM_EXEC void operator()(const ConnectivityInVec& connectivityIn,
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ConnectivityOutVec& connectivityOut,
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const ThreadIndicesType threadIndices) const
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{
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vtkm::Id3 inputIndex = threadIndices.GetInputIndex3D();
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// Calculate the type of tetrahedron generated because it alternates
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vtkm::Id indexType = (inputIndex[0] + inputIndex[1] + inputIndex[2]) % 2;
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vtkm::IdComponent visitIndex = threadIndices.GetVisitIndex();
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connectivityOut[0] =
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connectivityIn[detail::StructuredTetrahedronIndices[indexType][visitIndex][0]];
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connectivityOut[1] =
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connectivityIn[detail::StructuredTetrahedronIndices[indexType][visitIndex][1]];
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connectivityOut[2] =
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connectivityIn[detail::StructuredTetrahedronIndices[indexType][visitIndex][2]];
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connectivityOut[3] =
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connectivityIn[detail::StructuredTetrahedronIndices[indexType][visitIndex][3]];
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}
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};
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template <typename CellSetType>
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vtkm::cont::CellSetSingleType<> Run(const CellSetType& cellSet,
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vtkm::cont::ArrayHandle<vtkm::IdComponent>& outCellsPerCell)
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{
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typedef vtkm::cont::DeviceAdapterAlgorithm<DeviceAdapter> DeviceAlgorithm;
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vtkm::cont::CellSetSingleType<> outCellSet(cellSet.GetName());
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vtkm::cont::ArrayHandle<vtkm::Id> connectivity;
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vtkm::worklet::DispatcherMapTopology<TetrahedralizeCell, DeviceAdapter> dispatcher;
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dispatcher.Invoke(cellSet, vtkm::cont::make_ArrayHandleGroupVec<4>(connectivity));
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// Fill in array of output cells per input cell
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DeviceAlgorithm::Copy(
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vtkm::cont::ArrayHandleConstant<vtkm::IdComponent>(5, cellSet.GetNumberOfCells()),
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outCellsPerCell);
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// Add cells to output cellset
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outCellSet.Fill(cellSet.GetNumberOfPoints(), vtkm::CellShapeTagTetra::Id, 4, connectivity);
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return outCellSet;
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}
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_TetrahedralizeStructured_h
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