InitializeNeighbourhoodMasksAndOutDegrees.h

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//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
// Copyright (c) 2018, The Regents of the University of California, through
// Lawrence Berkeley National Laboratory (subject to receipt of any required approvals
// from the U.S. Dept. of Energy).  All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
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// (1) Redistributions of source code must retain the above copyright notice, this
//     list of conditions and the following disclaimer.
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// (3) Neither the name of the University of California, Lawrence Berkeley National
//     Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
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//=============================================================================
//
//  This code is an extension of the algorithm presented in the paper:
//  Parallel Peak Pruning for Scalable SMP Contour Tree Computation.
//  Hamish Carr, Gunther Weber, Christopher Sewell, and James Ahrens.
//  Proceedings of the IEEE Symposium on Large Data Analysis and Visualization
//  (LDAV), October 2016, Baltimore, Maryland.
//
//  The PPP2 algorithm and software were jointly developed by
//  Hamish Carr (University of Leeds), Gunther H. Weber (LBNL), and
//  Oliver Ruebel (LBNL)
//==============================================================================
 
#ifndef vtk_m_worklet_contourtree_augmented_active_graph_initialize_neighbourhood_masks_and_out_degrees_h
#define vtk_m_worklet_contourtree_augmented_active_graph_initialize_neighbourhood_masks_and_out_degrees_h
 
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace active_graph_inc
{
 
 
// Worklet for computing the sort indices from the sort order
class InitializeNeighbourhoodMasksAndOutDegrees : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    FieldIn sortIndex,                // (input) sort index
    ExecObject meshStructure,         // (input) execution object with the mesh structure
    WholeArrayOut neighbourhoodMasks, // (output) neighbourhoodMask for each vertex
    WholeArrayOut outDegrees);        // (outpur) outDegress for each vertex
  typedef void ExecutionSignature(_1, _2, _3, _4);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  InitializeNeighbourhoodMasksAndOutDegrees()
    : IsJoinGraph(true)
  {
  }
 
  // Constructor
  VTKM_EXEC_CONT
  InitializeNeighbourhoodMasksAndOutDegrees(const bool joinGraph)
    : IsJoinGraph(joinGraph)
  {
  }
 
  template <typename MeshStructureType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& sortIndex,
                            const MeshStructureType& meshStructure,
                            const OutFieldPortalType& neighbourhoodMasksPortal,
                            const OutFieldPortalType& outDegreesPortal) const
  {
    const vtkm::Pair<vtkm::Id, vtkm::Id>& maskAndDegree =
      meshStructure.GetNeighbourComponentsMaskAndDegree(sortIndex, this->IsJoinGraph);
    neighbourhoodMasksPortal.Set(sortIndex, maskAndDegree.first);
    outDegreesPortal.Set(sortIndex, maskAndDegree.second);
 
    // In serial this worklet implements the following operation
    // for (indexType sortIndex = 0; sortIndex < mesh.GetNumberOfVertices(); ++sortIndex)
    //    {
    //       std::tie(neighbourhoodMasks[sortIndex], outDegrees[sortIndex]) = mesh.GetNeighbourComponentsMaskAndDegree(sortIndex, this->IisJoinGraph);
    //    }
  }
 
private:
  bool IsJoinGraph;
 
}; // Mesh2D_DEM_VertexStarter
 
 
} // namespace mesh_dem_triangulation_worklets
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif