IsStar.h

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#ifndef vtkm_worklet_cosmotools_is_star_h
#define vtkm_worklet_cosmotools_is_star_h
 
#include <vtkm/worklet/WorkletMapField.h>
 
namespace vtkm
{
namespace worklet
{
namespace cosmotools
{
 
// Examine halo ids from current pass and last pass to see if particles
// are rooted in an existing halo
class IsStar : public vtkm::worklet::WorkletMapField
{
public:
  using ControlSignature = void(FieldIn index,
                                WholeArrayInOut haloIdCurrent,
                                WholeArrayInOut haloIdLast,
                                WholeArrayInOut rootedStar);
  using ExecutionSignature = void(_1, _2, _3, _4);
  using InputDomain = _1;
 
  // Constructor
  VTKM_EXEC_CONT
  IsStar() {}
 
  template <typename InPortalType, typename InPortalType2>
  VTKM_EXEC void operator()(const vtkm::Id& i,
                            const InPortalType& haloIdCurrent,
                            const InPortalType& haloIdLast,
                            InPortalType2& rootedStar) const
  {
    vtkm::Id dValue = haloIdLast.Get(i);
    vtkm::Id ddValue = haloIdCurrent.Get(dValue);
    if (dValue != ddValue)
    {
      rootedStar.Set(dValue, false);
      rootedStar.Set(ddValue, false);
    }
  }
}; // IsStar
}
}
}
 
#endif