FindNecessaryInteriorSupernodesFindNodesWorklet.h

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//============================================================================
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//
//  This software is distributed WITHOUT ANY WARRANTY; without even
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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 SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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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_bract_maker_find_necessary_interior_supernodes_find_nodes_worklet_h
#define vtk_m_worklet_contourtree_distributed_bract_maker_find_necessary_interior_supernodes_find_nodes_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 bract_maker
{
 
class FindNecessaryInteriorSupernodesFindNodesWorklet : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn superarc,                       // (input) superarcs
                                FieldIn superarcDependentBoundaryCount, // (input)
                                WholeArrayOut isNecessary               // (output)
  );
  using ExecutionSignature = void(_1, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  FindNecessaryInteriorSupernodesFindNodesWorklet(vtkm::Id numBoundary)
    : NumBoundary(numBoundary)
  {
  }
 
  template <typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superarc,
                            const vtkm::Id& dependentWeight,
                            const OutFieldPortalType& isNecessaryPortal) const
  {
    // skip the stub superarc at the root
    if (vtkm::worklet::contourtree_augmented::NoSuchElement(superarc))
    {
      return;
    }
    // skip vertices with 0 / ALL
    if ((dependentWeight != 0) && (dependentWeight != this->NumBoundary))
    { // mark target
      isNecessaryPortal.Set(vtkm::worklet::contourtree_augmented::MaskedIndex(superarc), true);
    } // mark target
    // In serial this worklet implements the following operation
    /*
    for (indexType supernode = 0; supernode < contourTree->supernodes.size(); supernode++)
      { // per supernode
      // skip the stub superarc at the root
      if (noSuchElement(contourTree->superarcs[supernode]))
        continue;
      indexType dependentWeight = superarcDependentBoundaryCount[supernode];
 
      // skip vertices with 0 / ALL
      if ((dependentWeight != 0) && (dependentWeight != nBoundary))
        // mark the target
        { // mark target
        isNecessary[maskedIndex(contourTree->superarcs[supernode])] = true;
        } // mark target
      } // per supernode
    */
  }
 
private:
  vtkm::Id NumBoundary;
 
}; // FindNecessaryInteriorSupernodesFindNodesWorklet
 
 
} // namespace bract_maker
} // namespace contourtree_distributed
} // namespace worklet
} // namespace vtkm
 
#endif