TransferSaddleStartsResetEdgeFar.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_active_graph_transfer_saddle_starts_reset_edge_far_h
#define vtk_m_worklet_contourtree_augmented_active_graph_transfer_saddle_starts_reset_edge_far_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree_augmented/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
 
namespace vtkm
{
namespace worklet
{
namespace contourtree_augmented
{
namespace active_graph_inc
{
 
 
// Worklet to update all of the edges so that the far end resets to the result of the ascent in the previous step
class TransferSaddleStartsResetEdgeFar : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn activeEdges,      // (input) active edges
                                WholeArrayIn hyperarcs,   // (input) hyperarcs
                                WholeArrayInOut edgeFar); // (output) edge far
  typedef void ExecutionSignature(_1, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  TransferSaddleStartsResetEdgeFar() {}
 
  template <typename InOutFieldPortalType, typename InFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& edgeId,
                            const InFieldPortalType& hyperarcsPortal,
                            const InOutFieldPortalType& edgeFarPortal) const
  {
    edgeFarPortal.Set(edgeId, MaskedIndex(hyperarcsPortal.Get(edgeFarPortal.Get(edgeId))));
 
    // In serial this worklet implements the following operation
    //for (vtkm::Id edge = 0; edge < activeEdges.size(); edge++)
    //    { // per edge
    //    indexType edgeID = activeEdges[edge];
    //    edgeFar[edgeID] = MaskedIndex(hyperarcs[edgeFar[edgeID]]);
    //    } // per edge
  }
 
 
}; //  TransferSaddleStartsResetEdgeFar
 
 
} // namespace active_graph_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif