worklet/Triangulate.h

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//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt for details.
//
//  This software is distributed WITHOUT ANY WARRANTY; without even
//  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
//  PURPOSE.  See the above copyright notice for more information.
//============================================================================
#ifndef vtkm_m_worklet_Triangulate_h
#define vtkm_m_worklet_Triangulate_h
 
#include <vtkm/filter/geometry_refinement/worklet/triangulate/TriangulateExplicit.h>
#include <vtkm/filter/geometry_refinement/worklet/triangulate/TriangulateStructured.h>
 
namespace vtkm
{
namespace worklet
{
 
class Triangulate
{
public:
  //
  // Distribute multiple copies of cell data depending on cells create from original
  //
  struct DistributeCellData : public vtkm::worklet::WorkletMapField
  {
    using ControlSignature = void(FieldIn inIndices, FieldOut outIndices);
 
    using ScatterType = vtkm::worklet::ScatterCounting;
 
    template <typename CountArrayType>
    VTKM_CONT static ScatterType MakeScatter(const CountArrayType& countArray)
    {
      return ScatterType(countArray);
    }
 
    template <typename T>
    VTKM_EXEC void operator()(T inputIndex, T& outputIndex) const
    {
      outputIndex = inputIndex;
    }
  };
 
  Triangulate()
    : OutCellScatter(vtkm::cont::ArrayHandle<vtkm::IdComponent>{})
  {
  }
 
  // Triangulate explicit data set, save number of triangulated cells per input
  template <typename CellSetType>
  vtkm::cont::CellSetSingleType<> Run(const CellSetType& cellSet)
  {
    TriangulateExplicit worklet;
    vtkm::cont::ArrayHandle<vtkm::IdComponent> outCellsPerCell;
    vtkm::cont::CellSetSingleType<> result = worklet.Run(cellSet, outCellsPerCell);
    this->OutCellScatter = DistributeCellData::MakeScatter(outCellsPerCell);
    return result;
  }
 
  // Triangulate structured data set, save number of triangulated cells per input
  vtkm::cont::CellSetSingleType<> Run(const vtkm::cont::CellSetStructured<2>& cellSet)
  {
    TriangulateStructured worklet;
    vtkm::cont::ArrayHandle<vtkm::IdComponent> outCellsPerCell;
    vtkm::cont::CellSetSingleType<> result = worklet.Run(cellSet, outCellsPerCell);
    this->OutCellScatter = DistributeCellData::MakeScatter(outCellsPerCell);
    return result;
  }
 
  vtkm::cont::CellSetSingleType<> Run(const vtkm::cont::CellSetStructured<3>&)
  {
    throw vtkm::cont::ErrorBadType("CellSetStructured<3> can't be triangulated");
  }
 
  vtkm::cont::CellSetSingleType<> Run(const vtkm::cont::CellSetStructured<1>&)
  {
    throw vtkm::cont::ErrorBadType("CellSetStructured<1> can't be tetrahedralized");
  }
 
  DistributeCellData::ScatterType GetOutCellScatter() const { return this->OutCellScatter; }
 
private:
  DistributeCellData::ScatterType OutCellScatter;
};
}
} // namespace vtkm::worklet
 
#endif // vtkm_m_worklet_Triangulate_h