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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 vtk_m_filter_ContourTreeUniform_h
#define vtk_m_filter_ContourTreeUniform_h

#include <vtkm/filter/FilterField.h>

namespace vtkm
{
namespace filter
{

/// \brief Construct the ContourTree for a 2D Mesh
///
/// Output field "saddlePeak" which is pairs of vertex ids indicating saddle and
/// peak of contour
/// Based on the algorithm presented in the paper:
//  “Parallel Peak Pruning for Scalable SMP Contour Tree Computation.”
class ContourTreeMesh2D : public vtkm::filter::FilterField<ContourTreeMesh2D>
{
public:
  VTKM_CONT
  ContourTreeMesh2D();

  /// Output field
  template <typename T, typename StorageType, typename DerivedPolicy, typename DeviceAdapter>
  VTKM_CONT vtkm::filter::Result DoExecute(const vtkm::cont::DataSet& input,
                                           const vtkm::cont::ArrayHandle<T, StorageType>& field,
                                           const vtkm::filter::FieldMetadata& fieldMeta,
                                           const vtkm::filter::PolicyBase<DerivedPolicy>& policy,
                                           const DeviceAdapter& tag);
};

template <>
class FilterTraits<ContourTreeMesh2D>
{
public:
  typedef TypeListTagScalarAll InputFieldTypeList;
};

/// \brief Construct the ContourTree for a 3D Mesh
///
/// Output field "saddlePeak" which is pairs of vertex ids indicating saddle and
/// peak of contour
/// Based on the algorithm presented in the paper:
//  “Parallel Peak Pruning for Scalable SMP Contour Tree Computation.”
class ContourTreeMesh3D : public vtkm::filter::FilterField<ContourTreeMesh3D>
{
public:
  VTKM_CONT
  ContourTreeMesh3D();

  /// Output field "saddlePeak" which is pairs of vertex ids indicating saddle and peak of contour
  template <typename T, typename StorageType, typename DerivedPolicy, typename DeviceAdapter>
  VTKM_CONT vtkm::filter::Result DoExecute(const vtkm::cont::DataSet& input,
                                           const vtkm::cont::ArrayHandle<T, StorageType>& field,
                                           const vtkm::filter::FieldMetadata& fieldMeta,
                                           const vtkm::filter::PolicyBase<DerivedPolicy>& policy,
                                           const DeviceAdapter& tag);
};

template <>
class FilterTraits<ContourTreeMesh3D>
{
public:
  typedef TypeListTagScalarAll InputFieldTypeList;
};
}
} // namespace vtkm::filter

#include <vtkm/filter/ContourTreeUniform.hxx>

#endif // vtk_m_filter_ContourTreeUniform_h
