AugmentMergeTrees_InitNewJoinSplitIDAndSuperparents.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.
//
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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_contourtree_maker_inc_augment_merge_tree_init_new_join_splot_id_and_superparents_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_augment_merge_tree_init_new_join_splot_id_and_superparents_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 for computing the sort indices from the sort order
class AugmentMergeTrees_InitNewJoinSplitIDAndSuperparents : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(
    FieldIn contourTreeSupernodes,      // (input) supernodes from the contour tree
    WholeArrayIn joinTreeSuperparents,  // (input)
    WholeArrayIn splitTreeSuperparents, // (input)
    WholeArrayIn joinTreeSupernodes,    // (input)
    WholeArrayIn splitTreeSupernodes,   // (input)
    WholeArrayOut joinSuperparent,      // (output)
    WholeArrayOut splitSuperparent,     // (output)
    WholeArrayOut newJoinID,            // (output)
    WholeArrayOut newSplitID);          // (output)
  typedef void ExecutionSignature(_1, InputIndex, _2, _3, _4, _5, _6, _7, _8, _9);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  AugmentMergeTrees_InitNewJoinSplitIDAndSuperparents() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& nodeID,
                            const vtkm::Id supernode,
                            const InFieldPortalType& joinTreeSuperparentsPortal,
                            const InFieldPortalType& splitTreeSuperparentsPortal,
                            const InFieldPortalType& joinTreeSupernodesPortal,
                            const InFieldPortalType& splitTreeSupernodesPortal,
                            const OutFieldPortalType& joinSuperparentPortal,
                            const OutFieldPortalType& splitSuperparentPortal,
                            const OutFieldPortalType& newJoinIDPortal,
                            const OutFieldPortalType& newSplitIDPortal) const
  {
    // Transfer the join information
    // look up the join superparent in the join tree
    vtkm::Id joinSuperparent = joinTreeSuperparentsPortal.Get(nodeID);
    // save the join superparent
    joinSuperparentPortal.Set(supernode, joinSuperparent);
    // now, if the join superparent's mesh ID is the node itself, we're at a join supernode
    if (joinTreeSupernodesPortal.Get(joinSuperparent) == nodeID)
      newJoinIDPortal.Set(joinSuperparent, supernode);
 
    // Transfer the split information
    // look up the split superparent in the split tree
    vtkm::Id splitSuperparent = splitTreeSuperparentsPortal.Get(nodeID);
    // save the split superparent
    splitSuperparentPortal.Set(supernode, splitSuperparent);
    // now, if the split superparent's mesh ID is the node, we're at a split supernode
    if (splitTreeSupernodesPortal.Get(splitSuperparent) == nodeID)
      newSplitIDPortal.Set(splitSuperparent, supernode);
 
    // In serial this worklet implements the following operation
    /*
      for (vtkm::Id supernode = 0; supernode < nSupernodes; supernode++)
        { // per supernode
 
          // find the regular ID for the supernode
          vtkm::Id nodeID = contourTree.Supernodes[supernode];
 
          // Transfer the join information
          // look up the join superparent in the join tree
          vtkm::Id joinSuperparent = joinTree.superparents[nodeID];
          // save the join superparent
          joinSuperparents[supernode] = joinSuperparent;
          // now, if the join superparent's mesh ID is the node itself, we're at a join supernode
          if (joinTree.Supernodes[joinSuperparent] == nodeID)
                  newJoinID[joinSuperparent] = supernode;
 
          // Transfer the split information
          // look up the split superparent in the split tree
          vtkm::Id splitSuperparent = splitTree.superparents[nodeID];
          // save the split superparent
          splitSuperparents[supernode] = splitSuperparent;
          // now, if the split superparent's mesh ID is the node, we're at a split supernode
          if (splitTree.Supernodes[splitSuperparent] == nodeID)
                  newSplitID[splitSuperparent] = supernode;
 
        } // per supernode
      */
  }
 
}; // AugmentMergeTrees_InitNewJoinSplitIDAndSuperparents.h
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif