ConnectivityExplicit.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 vtk_m_exec_ConnectivityExplicit_h
#define vtk_m_exec_ConnectivityExplicit_h
 
#include <vtkm/CellShape.h>
#include <vtkm/Types.h>
 
#include <vtkm/VecFromPortal.h>
 
namespace vtkm
{
namespace exec
{
 
template <typename ShapesPortalType, typename ConnectivityPortalType, typename OffsetsPortalType>
class ConnectivityExplicit
{
public:
  using SchedulingRangeType = vtkm::Id;
 
  ConnectivityExplicit() {}
 
  ConnectivityExplicit(const ShapesPortalType& shapesPortal,
                       const ConnectivityPortalType& connPortal,
                       const OffsetsPortalType& offsetsPortal)
    : Shapes(shapesPortal)
    , Connectivity(connPortal)
    , Offsets(offsetsPortal)
  {
  }
 
  VTKM_EXEC
  SchedulingRangeType GetNumberOfElements() const { return this->Shapes.GetNumberOfValues(); }
 
  using CellShapeTag = vtkm::CellShapeTagGeneric;
 
  VTKM_EXEC
  CellShapeTag GetCellShape(vtkm::Id index) const { return CellShapeTag(this->Shapes.Get(index)); }
 
  VTKM_EXEC
  vtkm::IdComponent GetNumberOfIndices(vtkm::Id index) const
  {
    return static_cast<vtkm::IdComponent>(this->Offsets.Get(index + 1) - this->Offsets.Get(index));
  }
 
  using IndicesType = vtkm::VecFromPortal<ConnectivityPortalType>;
 
  VTKM_EXEC
  IndicesType GetIndices(vtkm::Id index) const
  {
    const vtkm::Id offset = this->Offsets.Get(index);
    const vtkm::Id endOffset = this->Offsets.Get(index + 1);
    const auto length = static_cast<vtkm::IdComponent>(endOffset - offset);
 
    return IndicesType(this->Connectivity, length, offset);
  }
 
private:
  ShapesPortalType Shapes;
  ConnectivityPortalType Connectivity;
  OffsetsPortalType Offsets;
};
 
} // namespace exec
} // namespace vtkm
 
#endif //  vtk_m_exec_ConnectivityExplicit_h