InitializeEdgeFarFromActiveIndices.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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//     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_active_graph_initialize_edge_far_from_active_indices_h
#define vtk_m_worklet_contourtree_augmented_active_graph_initialize_edge_far_from_active_indices_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 for computing the sort indices from the sort order
class InitializeEdgeFarFromActiveIndices : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(WholeArrayInOut edgeFar,     // (input/output) edge far
                                WholeArrayIn extrema,        // (input) extremum
                                WholeArrayIn activeIndices); // (input) activeIndices
  typedef void ExecutionSignature(_1, InputIndex, _2, _3);
  using InputDomain = _1;
 
  // Default Constructor
  VTKM_EXEC_CONT
  InitializeEdgeFarFromActiveIndices() {}
 
  template <typename InOutFieldPortalType, typename InFieldPortalType>
  VTKM_EXEC void operator()(const InOutFieldPortalType& edgeFarPortal,
                            const vtkm::Id edge,
                            const InFieldPortalType& extremaPortal,
                            const InFieldPortalType& activeIndicesPortal) const
  {
    // first we retrieve the ID of the far end
    vtkm::Id currEdgeFar = edgeFarPortal.Get(edge);
    // next we follow up to an extremum
    currEdgeFar = vtkm::worklet::contourtree_augmented::MaskedIndex(extremaPortal.Get(currEdgeFar));
    // now we reverse lookup to get the new ID
    edgeFarPortal.Set(edge, activeIndicesPortal.Get(currEdgeFar));
 
    // In serial this worklet implements the following operation
    // for (indexType edge = 0; edge < edgeNear.size(); edge++)
    // { // per edge
    //   // first we retrieve the ID of the far end
    //   indexType currEdgeFar = edgeFar[edge];
    //   // next we follow up to an extremum
    //   currEdgeFar = MaskedIndex(extrema[currEdgeFar]);
    //   // now we reverse lookup to get the new ID
    //   edgeFar[edge] = activeIndices[currEdgeFar];
    // } per edge
  }
 
 
}; //  InitializeEdgeFarFromActiveIndices
 
 
} // namespace active_graph_inc
} // namespace contourtree_augmented
} // namespace worklet
} // namespace vtkm
 
#endif