ComputeHyperAndSuperStructure_SetFirstSupernodePerIterationWorklet.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.
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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_compute_hyper_and_super_structure_set_first_supernode_per_iteration_worklet_h
#define vtk_m_worklet_contourtree_augmented_contourtree_maker_inc_compute_hyper_and_super_structure_set_first_supernode_per_iteration_worklet_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 for settubg the super/hyperarcs fromm the permuted super/hyperarcs vector
class ComputeHyperAndSuperStructure_SetFirstSupernodePerIterationWorklet
  : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn supernodeIndex,       // (input) active super/hyperarcs
                                WholeArrayIn whenTransferred, // (input)
                                WholeArrayOut firstSupernodePerIteration); // (output)
  typedef void ExecutionSignature(_1, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  ComputeHyperAndSuperStructure_SetFirstSupernodePerIterationWorklet() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& supernode,
                            const InFieldPortalType& whenTransferredPortal,
                            const OutFieldPortalType& firstSupernodePerIterationPortal) const
  {
    // per supernode
    vtkm::Id when =
      vtkm::worklet::contourtree_augmented::MaskedIndex(whenTransferredPortal.Get(supernode));
    if (supernode == 0)
    { // zeroth supernode
      firstSupernodePerIterationPortal.Set(when, supernode);
    } // zeroth supernode
    else
    {
      vtkm::Id prevWhen =
        vtkm::worklet::contourtree_augmented::MaskedIndex(whenTransferredPortal.Get(supernode - 1));
      if (when != prevWhen)
      { // non-matching supernode
        firstSupernodePerIterationPortal.Set(when, supernode);
      } // non-matching supernode
    }
    // In serial this worklet implements the following operation
    /*
     for (indexType supernode = 0; supernode < contourTree.supernodes.size(); supernode++)
     { // per supernode
       indexType when = maskedIndex(contourTree.whenTransferred[supernode]);
       if (supernode == 0)
       { // zeroth supernode
         contourTree.firstSupernodePerIteration[when] = supernode;
       } // zeroth supernode
       else if (when != maskedIndex(contourTree.whenTransferred[supernode-1]))
       { // non-matching supernode
         contourTree.firstSupernodePerIteration[when] = supernode;
       } // non-matching supernode
    } // per supernode
    */
  }
 
}; // ComputeHyperAndSuperStructure_SetFirstSupernodePerIterationWorklet
 
} // namespace contourtree_maker_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif