SkipVertex.h

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//  This code is based on 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.
 
#ifndef vtkm_worklet_contourtree_skip_vertex_h
#define vtkm_worklet_contourtree_skip_vertex_h
 
#include <vtkm/filter/scalar_topology/worklet/contourtree/Types.h>
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace contourtree
{
 
// Worklet for doing regular to candidate
class SkipVertex : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn superID,            // (input) index into supernodes
                                WholeArrayIn superarcs,     // (input)
                                WholeArrayInOut joinArcs,   // (i/o)
                                WholeArrayInOut splitArcs); // (i/o)
  using ExecutionSignature = void(_1, _2, _3, _4);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  SkipVertex() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID,
                            const InFieldPortalType& superarcs,
                            const OutFieldPortalType& joinArcs,
                            const OutFieldPortalType& splitArcs) const
  {
    //  retrieve it's join neighbour j
    vtkm::Id joinNeighbour = joinArcs.Get(superID);
 
    // if v has a join neighbour (i.e. j == -1) and j has a contour arc
    if ((joinNeighbour != NO_VERTEX_ASSIGNED) &&
        (superarcs.Get(joinNeighbour) != NO_VERTEX_ASSIGNED))
      // reset the vertex' join neighbour
      joinArcs.Set(superID, joinArcs.Get(joinNeighbour));
 
    // retrieve it's split neighbour s
    vtkm::Id splitNeighbour = splitArcs.Get(superID);
 
    // if v has a split neighbour (i.e. s == -1) and s has a contour arc
    if ((splitNeighbour != NO_VERTEX_ASSIGNED) &&
        (superarcs.Get(splitNeighbour) != NO_VERTEX_ASSIGNED))
      // reset the vertex' split neighbour
      splitArcs.Set(superID, splitArcs.Get(splitNeighbour));
  }
}; // SkipVertex
}
}
}
 
#endif