TransferLeafChains_CollapsePastRegular.h

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//============================================================================
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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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//     this list of conditions and the following disclaimer in the documentation
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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_transfer_leaf_chains_collapse_past_regular_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_transfer_leaf_chains_collapse_past_regular_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 collapse past regular vertices by updating inbound and outbound as part
// loop to find the now-regular vertices and collapse past them without altering
// the existing join & split arcs
class TransferLeafChains_CollapsePastRegular : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn activeSupernodes, // (input)
                                WholeArrayInOut outbound, // (output)
                                WholeArrayInOut inbound   // (output)
  );
  typedef void ExecutionSignature(_1, InputIndex, _2, _3);
  using InputDomain = _1;
 
 
  // Default Constructor
  VTKM_EXEC_CONT
  TransferLeafChains_CollapsePastRegular() {}
 
  template <typename InOutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID,
                            const vtkm::Id /*activeID*/, // FIXME: Remove unused parameter?
                            const InOutFieldPortalType& outboundPortal,
                            const InOutFieldPortalType& inboundPortal) const
  {
    vtkm::Id outNeighbour = outboundPortal.Get(superID);
    vtkm::Id inNeighbour = inboundPortal.Get(superID);
 
    // if the outbound is terminal, we're done, otherwise update
    if (!IsTerminalElement(outNeighbour))
      outboundPortal.Set(superID, outboundPortal.Get(outNeighbour));
 
    // if the inNeighbour is not terminal, update
    if (!IsTerminalElement(inNeighbour))
      inboundPortal.Set(superID, inboundPortal.Get(inNeighbour));
 
    // In serial this worklet implements the following operation
    /*
        for (vtkm::Id activeID = 0; activeID < activeSupernodes.GetNumberOfValues(); activeID++)
          { // per active vertex
            vtkm::Id superID = activeSupernodes[activeID];
            vtkm::Id outNeighbour = outbound[superID];
            vtkm::Id inNeighbour = inbound[superID];
 
            // if the outbound is terminal, we're done, otherwise update
            if (!IsTerminalElement(outNeighbour))
                    outbound[superID] = outbound[outNeighbour];
 
            // if the inNeighbour is not terminal, update
            if (!IsTerminalElement(inNeighbour))
                    inbound[superID] = inbound[inNeighbour];
          } // per active vertex
 
      */
  }
 
}; // TransferLeafChains_CollapsePastRegular
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif