ValidHalo.h

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#ifndef vtkm_worklet_cosmotools_valid_halo_h
#define vtkm_worklet_cosmotools_valid_halo_h
 
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace cosmotools
{
 
// Return 1 for every unique halo meeting minimum size
class ValidHalo : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn index,
                                FieldIn partPerHalo,
                                WholeArrayIn haloId,
                                FieldOut isValidHalo);
  using ExecutionSignature = _4(_1, _2, _3);
  using InputDomain = _1;
 
  vtkm::Id pmin;
 
  // Constructor
  VTKM_EXEC_CONT
  ValidHalo(vtkm::Id minimumHalo)
    : pmin(minimumHalo)
  {
  }
 
  template <typename InPortalType>
  VTKM_EXEC vtkm::Id operator()(const vtkm::Id& i,
                                const vtkm::Id& partPerHalo,
                                const InPortalType& haloId) const
  {
    // Boundary condition
    if ((i == 0) && (partPerHalo >= pmin))
      return 1;
    // Return valid if it is the first particle in halo of correct size
    if ((haloId.Get(i) != haloId.Get(i - 1)) && (partPerHalo >= pmin))
      return 1;
    return 0;
  }
}; // ValidHalo
}
}
}
 
#endif