CopyJoinSplit.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_copy_join_split_h
#define vtkm_worklet_contourtree_copy_join_split_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 CopyJoinSplit : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn superID,         // (input) index into super nodes
                                WholeArrayIn inbound,    // (input) join or split arcs
                                WholeArrayIn indegree,   // (input)
                                WholeArrayIn outdegree,  // (input)
                                WholeArrayOut outbound); // (output) join or split arcs
  using ExecutionSignature = void(_1, _2, _3, _4, _5);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  CopyJoinSplit() {}
 
  template <typename InFieldPortalType, typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID,
                            const InFieldPortalType& inbound,
                            const InFieldPortalType& indegree,
                            const InFieldPortalType& outdegree,
                            const OutFieldPortalType& outbound) const
  {
    // if the vertex is critical, set it to -1
    if ((outdegree.Get(superID) != 1) || (indegree.Get(superID) != 1))
      outbound.Set(superID, NO_VERTEX_ASSIGNED);
 
    // check the inbound neighbour
    // if regular, set it to point outwards
    vtkm::Id inNeighbour = inbound.Get(superID);
    if (inNeighbour != NO_VERTEX_ASSIGNED)
    { // inbound exists
      if ((outdegree.Get(inNeighbour) == 1) && (indegree.Get(inNeighbour) == 1))
        outbound.Set(inNeighbour, superID);
    } // inbound exists
  }
}; // CopyJoinSplit
}
}
}
 
#endif