TransferLeafChains_InitInAndOutbound.h

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//============================================================================
// 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.
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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_contourtree_maker_inc_transfer_leaf_chains_init_in_and_outbound_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_transfer_leaf_chains_init_in_and_outbound_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace contourtree_maker_inc
{
 
// Worklet to loop through each active node to copy join/split to outbound and inbound arrays
class TransferLeafChains_InitInAndOutbound : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn activeSupernodes, // (input)
                                WholeArrayIn inwards,     // (input)
                                WholeArrayIn outdegree,   // (input)
                                WholeArrayIn indegree,    // (input)
                                WholeArrayOut outbound,   // (output)
                                WholeArrayOut inbound     // (output)
  );
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4, _5, _6);
  using InputDomain = _1;
 
 
  // Default Constructor
  VTKM_EXEC_CONT
  TransferLeafChains_InitInAndOutbound() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID,
                            const vtkm::Id /*activeID*/, // FIXME: Remove unused parameter?
                            const InFieldPortalType& inwardsPortal,
                            const InFieldPortalType& outdegreePortal,
                            const InFieldPortalType& indegreePortal,
                            const OutFieldPortalType& outboundPortal,
                            const OutFieldPortalType& inboundPortal) const
  {
    vtkm::Id inNeighbour = inwardsPortal.Get(superID);
 
    // if the vertex is a leaf, set it's inbound links
    if ((outdegreePortal.Get(superID) == 0) && (indegreePortal.Get(superID) == 1))
    { // outer leaf
      outboundPortal.Set(superID, superID | TERMINAL_ELEMENT);
      inboundPortal.Set(superID, inNeighbour);
    } // outer leaf
    else if ((outdegreePortal.Get(superID) != 1) || (indegreePortal.Get(superID) != 1))
    { // other critical node
      outboundPortal.Set(superID, superID | TERMINAL_ELEMENT);
      inboundPortal.Set(superID, superID | TERMINAL_ELEMENT);
    } // other critical node
    else
    { // non-critical node
      // copy the inwards link (which is guaranteed not to be the infinite root)
      inboundPortal.Set(superID, inNeighbour);
    } // non-critical node
 
    // if the inbound neighbour is regular, we want to set its outbound link
    // check whether it's the root in the tree (points to infinite root)
    if (!NoSuchElement(inNeighbour))
    { // inwards exists
      // if the inwards neighbour is regular, set the reverse link
      if ((outdegreePortal.Get(inNeighbour) == 1) && (indegreePortal.Get(inNeighbour) == 1))
      {
        outboundPortal.Set(inNeighbour, superID);
      }
    } // inwards exists
 
 
 
    // In serial this worklet implements the following operation
    /*
      for (vtkm::Id activeID = 0; activeID < activeSupernodes.size(); activeID++)
        { // for each active node
          vtkm::Id superID = activeSupernodes[activeID];
          vtkm::Id inNeighbour = inwards[superID];
 
          // if the vertex is a leaf, set it's inbound links
          if ((outdegree[superID] == 0) && (indegree[superID] == 1))
            { // outer leaf
              outbound[superID] = superID | TERMINAL_ELEMENT;
              inbound[superID] = inNeighbour;
            } // outer leaf
          else if ((outdegree[superID] != 1) || (indegree[superID] != 1))
            { // other critical node
              outbound[superID] = superID | TERMINAL_ELEMENT;
              inbound[superID] = superID | TERMINAL_ELEMENT;
            } // other critical node
          else
            { // non-critical node
              // copy the inwards link (which is guaranteed not to be the infinite root)
              inbound[superID] = inNeighbour;
            } // non-critical node
 
          // if the inbound neighbour is regular, we want to set its outbound link
          // check whether it's the root in the tree (points to infinite root)
          if (!NoSuchElement(inNeighbour))
            { // inwards exists
              // if the inwards neighbour is regular, set the reverse link
              if ((outdegree[inNeighbour] == 1) && (indegree[inNeighbour] == 1))
                {
                  outbound[inNeighbour] = superID;
                }
            } // inwards exists
        } // for each active node
 
      */
  }
 
}; // TransferLeafChains_InitInAndOutound
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif