SetArcsSetSuperAndHypernodeArcs.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_arcs_set_super_and_hypernode_arcs_h
#define vtk_m_worklet_contourtree_augmented_active_graph_set_arcs_set_super_and_hypernode_arcs_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 SetArcsSetSuperAndHypernodeArcs : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    WholeArrayIn graphGlobalIndex,   // (input) global index from the graph
    WholeArrayIn graphHyperarcs,     // (input) hyperarcs from the portal
    WholeArrayIn graphHyperID,       // (input) active graph hyperID
    WholeArrayOut treeArcs,          // (output) arcs of the tree
    WholeArrayOut treeSuperparents); // (output) superparents of the tree
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4, _5);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  SetArcsSetSuperAndHypernodeArcs() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const InFieldPortalType& graphGlobalIndexPortal,
                            const vtkm::Id graphVertex,
                            const InFieldPortalType& graphHyperarcsPortal,
                            const InFieldPortalType& graphHyperIDPortal,
                            const OutFieldPortalType& treeArcsPortal,
                            const OutFieldPortalType& treeSuperparentsPortal) const
  {
    vtkm::Id graphTarget = graphHyperarcsPortal.Get(graphVertex);
    // ignore all regular points
    if (!IsSupernode(graphTarget))
      return;
 
    // copy the target to the arcs array
    vtkm::Id nodeID = graphGlobalIndexPortal.Get(graphVertex);
    if (NoSuchElement(graphTarget))
    { // trunk hypernode
      treeArcsPortal.Set(nodeID, ((vtkm::Id)NO_SUCH_ELEMENT) | IS_HYPERNODE | IS_SUPERNODE);
      treeSuperparentsPortal.Set(nodeID, graphHyperIDPortal.Get(graphVertex));
    } // trunk hypernode
    else if (IsHypernode(graphTarget))
    { // hypernode
      treeArcsPortal.Set(
        nodeID, graphGlobalIndexPortal.Get(MaskedIndex(graphTarget)) | IS_HYPERNODE | IS_SUPERNODE);
      treeSuperparentsPortal.Set(nodeID, graphHyperIDPortal.Get(graphVertex));
    } // hypernode
    else
    { // supernode
      treeArcsPortal.Set(nodeID,
                         graphGlobalIndexPortal.Get(MaskedIndex(graphTarget)) | IS_SUPERNODE);
    } // supernode
 
    // In serial this worklet implements the following operation
    /*
      for (indexType graphVertex = 0; graphVertex < globalIndex.size(); graphVertex++)
        { // per graph vertex
          // retrieve the ID stored in the hyperarcs array
          indexType graphTarget = hyperarcs[graphVertex];
 
          // ignore all regular points
          if (!IsSupernode(graphTarget))
            continue;
 
          // copy the target to the arcs array
          indexType nodeID = globalIndex[graphVertex];
          if (NoSuchElement(graphTarget))
            { // trunk hypernode
              tree.Arcs[nodeID] = NO_SUCH_ELEMENT | IS_HYPERNODE | IS_SUPERNODE;
              tree.Superparents[nodeID] = hyperID[graphVertex];
            } // trunk hypernode
          else if (IsHypernode(graphTarget))
            { // hypernode
              tree.Arcs[nodeID] = globalIndex[MaskedIndex(graphTarget)] | IS_HYPERNODE | IS_SUPERNODE;
              tree.Superparents[nodeID] = hyperID[graphVertex];
            } // hypernode
          else
            { // supernode
              tree.Arcs[nodeID] = globalIndex[MaskedIndex(graphTarget)] | IS_SUPERNODE;
            } // supernode
 
        } // per graph vertex
      */
  }
 
}; // SetArcsSetSuperAndHypernodeArcs
 
} // namespace active_graph_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif