SetSuperArcsSetTreeHyperparents.h

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//
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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
//     used to endorse or promote products derived from this software without
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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_set_super_arcs_set_tree_hyperparents_h
#define vtk_m_worklet_contourtree_augmented_active_graph_set_super_arcs_set_tree_hyperparents_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.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 SetSuperArcsSetTreeHyperparents : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    FieldIn treeSupernodes,          // (input) supernodes of the tree
    WholeArrayIn hyperarcs,          // (input) hyperarcs
    WholeArrayOut treeHyperparents); // (output) hyperparents from the tree
  typedef void ExecutionSignature(_1, InputIndex, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  SetSuperArcsSetTreeHyperparents() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& graphVertex,
                            const vtkm::Id supernode,
                            const InFieldPortalType& hyperarcsPortal,
                            const OutFieldPortalType& treeHyperparentsPortal) const
  {
    // retrieve the ID stored in the hyperarcs array
    vtkm::Id graphTarget = hyperarcsPortal.Get(graphVertex);
 
    // hypernodes use themselves
    if (IsHypernode(graphTarget))
      treeHyperparentsPortal.Set(supernode, graphVertex);
    // otherwise the hyperarc shows the hyperparent
    else
      // store the superarc's hyperparent
      treeHyperparentsPortal.Set(supernode, MaskedIndex(graphTarget));
 
    // In serial this worklet implements the following operation
    /*
      for (indexType supernode = 0; supernode < nSupernodes; supernode++)
        { // per graph vertex
          // retrieve the graph index
          indexType graphVertex = tree.Supernodes[supernode];
 
          // retrieve the ID stored in the hyperarcs array
          indexType graphTarget = hyperarcs[graphVertex];
 
          // hypernodes use themselves
          if (IsHypernode(graphTarget))
                  tree.hyperparents[supernode] = graphVertex;
          // otherwise the hyperarc shows the hyperparent
          else
                  // store the superarc's hyperparent
                  tree.hyperparents[supernode] = MaskedIndex(graphTarget);
        } // per graph vertex
      */
  }
 
}; // SetSuperArcsSetTreeHyperparents
 
} // namespace active_graph_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif