InitActiceSuperarcIdWorklet.h

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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,
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//     Laboratory, U.S. Dept. of Energy nor the names of its contributors may be
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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_distributed_tree_grafter_init_active_superarc_id_worklet_h
#define vtk_m_worklet_contourtree_distributed_tree_grafter_init_active_superarc_id_worklet_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
namespace tree_grafter
{
 
// In TreeGrafter.InitializeActiveSuperarcs set the temporary variable activeSuperarcId
class InitActiceSuperarcIdWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(
    FieldIn
      superarcIndex, // input iteration index. loop to one less than ContourTree->Supernodes.GetNumberOfValues()
    WholeArrayIn contourtreeSuperarcs,      // input
    WholeArrayIn interiorForestIsNecessary, // input
    FieldOut activeSuperarcId               // output
  );
 
  using ExecutionSignature = _4(_1, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  InitActiceSuperarcIdWorklet() {}
 
  template <typename InFieldPortalType>
  VTKM_EXEC vtkm::Id operator()(const vtkm::Id& superarcIndex,
                                const InFieldPortalType& contourtreeSuperarcPortal,
                                const InFieldPortalType& isNecessaryPortal) const
  { // operator ()
    // retrieve the target
    vtkm::Id superarcTo = vtkm::worklet::contourtree_augmented::MaskedIndex(
      contourtreeSuperarcPortal.Get(superarcIndex));
    // now set the flag for which ones are needed
    return (!isNecessaryPortal.Get(superarcIndex) || !isNecessaryPortal.Get(superarcTo));
 
    // In serial this worklet implements the following operation
    /*
      // loop to one less, i.e. excluding null superarc from root
      for (indexType superarc = 0; superarc < contourTree->supernodes.size() - 1; superarc++)
        { // per superarc
        // retrieve the target
        indexType superarcTo = maskedIndex(contourTree->superarcs[superarc]);
 
        // now set the flag for which ones are needed
        activeSuperarcID[superarc] = !residue->isNecessary[superarc] || !residue->isNecessary[superarcTo];
        } // per superarc
    */
  } // operator ()
 
}; // BoundaryVerticiesPerSuperArcStepOneWorklet
 
} // namespace tree_grafter
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif