127 lines
4.0 KiB
C++
127 lines
4.0 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_TriangulateStructured_h
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#define vtk_m_worklet_TriangulateStructured_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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namespace worklet {
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namespace detail {
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VTKM_EXEC_CONSTANT
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const static vtkm::IdComponent StructuredTriangleIndices[2][3] = {
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{ 0, 1, 2 },
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{ 0, 2, 3 }
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};
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} // namespace detail
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/// \brief Compute the triangulate cells for a uniform grid data set
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template <typename DeviceAdapter>
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class TriangulateStructured
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{
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public:
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TriangulateStructured() {}
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//
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// Worklet to turn quads into triangles
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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 TriangulateCell : public vtkm::worklet::WorkletMapPointToCell
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{
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public:
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typedef void ControlSignature(CellSetIn cellset,
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FieldOutCell<> connectivityOut);
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typedef void ExecutionSignature(PointIndices, _2, VisitIndex);
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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
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{
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return ScatterType(2);
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}
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VTKM_CONT
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TriangulateCell()
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{ }
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// Each quad cell produces 2 triangle cells
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template<typename ConnectivityInVec, typename ConnectivityOutVec>
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VTKM_EXEC
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void operator()(const ConnectivityInVec &connectivityIn,
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ConnectivityOutVec &connectivityOut,
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vtkm::IdComponent visitIndex) const
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{
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connectivityOut[0] = connectivityIn[detail::StructuredTriangleIndices[visitIndex][0]];
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connectivityOut[1] = connectivityIn[detail::StructuredTriangleIndices[visitIndex][1]];
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connectivityOut[2] = connectivityIn[detail::StructuredTriangleIndices[visitIndex][2]];
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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<TriangulateCell,DeviceAdapter> dispatcher;
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dispatcher.Invoke(cellSet,
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vtkm::cont::make_ArrayHandleGroupVec<3>(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>(2, cellSet.GetNumberOfCells()),
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outCellsPerCell);
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// Add cells to output cellset
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outCellSet.Fill(
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cellSet.GetNumberOfPoints(),
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vtkm::CellShapeTagTriangle::Id,
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3,
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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_TriangulateStructured_h
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