CalculateAttachementCounterWorklet.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_distributed_tree_grafter_calculate_attachement_counter_worklet_h
#define vtk_m_worklet_contourtree_distributed_tree_grafter_calculate_attachement_counter_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.GraftInteriorForests to compute attachmentCounter to
// check whether additional attachement points need to be transferred
class CalculateAttachementCounterWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn supernodeType,       // input
                                FieldIn hierarchicalSuperId, // input
                                FieldOut attachmentCounter   // output
 
  );
 
  using ExecutionSignature = _3(_1, _2);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  CalculateAttachementCounterWorklet() {}
 
  VTKM_EXEC vtkm::Id operator()(const vtkm::Id& supernodeType,
                                const vtkm::Id& hierarchicalSuperId) const
  { // operator ()
    return (supernodeType == vtkm::worklet::contourtree_augmented::IS_ATTACHMENT) &&
      vtkm::worklet::contourtree_augmented::NoSuchElement(hierarchicalSuperId);
    // In serial this worklet implements the following operation
    /*
    for (indexType supernode = 0; supernode < contourTree->supernodes.size(); supernode++)
      attachmentCounter[supernode] = (supernodeType[supernode] == IS_ATTACHMENT) && noSuchElement(hierarchicalSuperID[supernode]);
    */
  } // operator ()
 
}; // CalculateAttachementCounterWorklet
 
} // namespace tree_grafter
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif