FindDegrees_ResetUpAndDowndegree.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,
// 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
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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_find_degrees_reset_up_and_downdegree_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_find_degrees_reset_up_and_downdegree_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 find the RHE of each segment. This worklet is used for both the join and split tree.
// In the case of the join tre we should use the updegree as input and for the split tree the downdegree
class FindDegrees_ResetUpAndDowndegree : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn activeSupernodes,  // (input)
                                WholeArrayOut updegree,    // (output)
                                WholeArrayOut downdegree); // (output)
  typedef void ExecutionSignature(_1, _2, _3);
  using InputDomain = _1;
 
 
  // Default Constructor
  VTKM_EXEC_CONT
  FindDegrees_ResetUpAndDowndegree() {}
 
  template <typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& supernode,
                            const OutFieldPortalType& updegreePortal,
                            const OutFieldPortalType& downdegreePortal) const
  {
    updegreePortal.Set(supernode, 0);
    downdegreePortal.Set(supernode, 0);
 
    // In serial this worklet implements the following operation
    /*
      for (indexType activeSupernode = 0; activeSupernode < nActiveSupernodes; activeSupernode++)
                { // per active supernode
                indexType supernode = activeSupernodes[activeSupernode];
                updegree[supernode] = downdegree[supernode] = 0;
                } // per active supernode
      */
  }
 
}; // FindDegrees_ResetUpAndDowndegree
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif