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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_regular_to_critical_up_h
#define vtkm_worklet_contourtree_regular_to_critical_up_h

#include <vtkm/worklet/WorkletMapField.h>

namespace vtkm
{
namespace worklet
{
namespace contourtree
{

// Worklet for doing regular to critical
class RegularToCriticalUp : public vtkm::worklet::WorkletMapField
{
public:
  typedef void ControlSignature(FieldIn<IdType> candIndex,       // (input) index into candidates
                                FieldIn<IdType> candidate,       // (input) candidate index
                                WholeArrayOut<IdType> critical); // (output)
  typedef void ExecutionSignature(_1, _2, _3);
  typedef _1 InputDomain;

  // Constructor
  VTKM_EXEC_CONT
  RegularToCriticalUp() {}

  template <typename OutFieldPortalType>
  VTKM_EXEC void operator()(const vtkm::Id& index,
                            const vtkm::Id& candidate,
                            const OutFieldPortalType& critical) const
  {
    critical.Set(candidate, index);
  }
}; // RegularToCriticalUp
}
}
}

#endif
