InitalizeSuperchildrenWorklet.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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//     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_distributed_hierarchical_contour_tree_initialize_superchildren_worklet_h
#define vtk_m_worklet_contourtree_distributed_hierarchical_contour_tree_initialize_superchildren_worklet_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_distributed
{
 
class InitalizeSuperchildrenWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn hyperarcs,       // input
                                WholeArrayIn hypernodes, // input
                                FieldOut superchildren   // output
  );
  using ExecutionSignature = _3(InputIndex, _1, _2);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  InitalizeSuperchildrenWorklet() {}
 
  template <typename InFieldPortalType>
  VTKM_EXEC vtkm::Id operator()(const vtkm::Id& hyperarc,
                                const vtkm::Id& hyperarcVal,
                                const InFieldPortalType& hypernodesPortal) const
  {
    // per hyperarc
    // test for root element
    if (vtkm::worklet::contourtree_augmented::NoSuchElement(hyperarcVal))
    {
      // root has one superchild: the root supernode
      return static_cast<vtkm::Id>(1);
    }
    else
    {
      // otherwise, compute a delta
      return hypernodesPortal.Get(hyperarc + 1) - hypernodesPortal.Get(hyperarc);
    }
 
    // In serial this worklet implements the following operation
    /*
     for (indexType hyperarc = 0; hyperarc < hyperarcs.size(); hyperarc++)
      { // per hyperarc
      // test for root element
      if (noSuchElement(hyperarcs[hyperarc]))
        // root has one superchild: the root supernode
        superchildren[hyperarc] = 1;
      else
        // otherwise, compute a delta
        superchildren[hyperarc] = hypernodes[hyperarc+1] - hypernodes[hyperarc];
      } // per hyperarc
    */
  } // operator()()
 
}; // InitalizeSuperchildrenWorklet
 
 
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif