UpdateOutbound.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_update_outbound_h
#define vtkm_worklet_contourtree_update_outbound_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 UpdateOutbound : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn superID,           // input
                                WholeArrayInOut outbound); // i/o
  using ExecutionSignature = void(_1, _2);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  UpdateOutbound() {}
 
  template <typename InOutPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& superID, const InOutPortalType& outbound) const
  {
    vtkm::Id outNeighbour = outbound.Get(superID);
 
    // ignore if it has no out neighbour
    if (outNeighbour == NO_VERTEX_ASSIGNED)
      return;
 
    // if it's out neighbour has none itself, it's a critical point & we stop
    vtkm::Id doubleOut = outbound.Get(outNeighbour);
    if (doubleOut == NO_VERTEX_ASSIGNED)
      return;
 
    // otherwise, we update
    outbound.Set(superID, doubleOut);
  }
}; // UpdateOutbound
}
}
}
 
#endif