SetSupernodeInward.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_set_supernode_inward_h
#define vtkm_worklet_contourtree_set_supernode_inward_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 SetSupernodeInward : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn superID,            // (input) index into supernodes
                                WholeArrayIn inbound,       // (input) join or split arc
                                WholeArrayIn outbound,      // (input) join or split arc
                                WholeArrayIn indegree,      // (input)
                                WholeArrayIn outdegree,     // (input)
                                WholeArrayInOut superarcs); // (in out)
  using ExecutionSignature = void(_1, _2, _3, _4, _5, _6);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  SetSupernodeInward() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID,
                            const InFieldPortalType& inbound,
                            const InFieldPortalType& outbound,
                            const InFieldPortalType& indegree,
                            const InFieldPortalType& outdegree,
                            const OutFieldPortalType& superarcs) const
  {
    // test for criticality
    vtkm::Id outNeighbour = outbound.Get(superID);
    vtkm::Id inNeighbour = inbound.Get(superID);
    if (outNeighbour == NO_VERTEX_ASSIGNED)
      return;
 
    // test for leaf-ness
    if ((outdegree.Get(outNeighbour) != 0) || (indegree.Get(outNeighbour) != 1))
      return;
 
    // skip if the superarc is already set
    if (superarcs.Get(superID) != NO_VERTEX_ASSIGNED)
      return;
 
    // we've passed the tests - set the supernode to point inwards
    superarcs.Set(superID, inNeighbour);
  }
}; // SetSupernodeInward
}
}
}
 
#endif