mirror of
https://gitlab.kitware.com/vtk/vtk-m
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124 lines
4.7 KiB
C++
124 lines
4.7 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#ifndef vtk_m_CellTraits_h
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#define vtk_m_CellTraits_h
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#include <vtkm/CellShape.h>
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namespace vtkm
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{
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/// \c vtkm::CellTraits::TopologyDimensionType is typedef to this with the
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/// template parameter set to \c TOPOLOGICAL_DIMENSIONS. See \c
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/// vtkm::CellTraits for more information.
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///
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template <vtkm::IdComponent dimension>
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struct CellTopologicalDimensionsTag
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{
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};
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/// \brief Tag for cell shapes with a fixed number of points.
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///
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struct CellTraitsTagSizeFixed
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{
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};
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/// \brief Tag for cell shapes that can have a variable number of points.
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///
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struct CellTraitsTagSizeVariable
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{
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};
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/// \brief Information about a cell based on its tag.
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///
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/// The templated CellTraits struct provides the basic high level information
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/// about cells (like the number of vertices in the cell or its
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/// dimensionality).
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///
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template <class CellTag>
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struct CellTraits
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#ifdef VTKM_DOXYGEN_ONLY
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{
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/// This defines the topological dimensions of the cell type. 3 for
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/// polyhedra, 2 for polygons, 1 for lines, 0 for points.
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///
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static const vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = 3;
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/// This tag is typedef'ed to
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/// `vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>`. This provides
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/// a convenient way to overload a function based on topological dimensions
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/// (which is usually more efficient than conditionals).
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///
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using TopologicalDimensionsTag = vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>;
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/// @brief A tag specifying whether the number of points is fixed.
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///
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/// If set to `vtkm::CellTraitsTagSizeFixed`, then `NUM_POINTS` is set. If set to
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/// `vtkm::CellTraitsTagSizeVariable`, then the number of points is not known at
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/// compile time.
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///
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using IsSizeFixed = vtkm::CellTraitsTagSizeFixed;
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/// @brief Number of points in the cell.
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///
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/// This is only defined for cell shapes of a fixed number of points (i.e.,
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/// `IsSizedFixed` is set to `vtkm::CellTraitsTagSizeFixed`).
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///
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static constexpr vtkm::IdComponent NUM_POINTS = 3;
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};
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#else // VTKM_DOXYGEN_ONLY
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;
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#endif // VTKM_DOXYGEN_ONLY
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//-----------------------------------------------------------------------------
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// Define traits for every cell type.
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#define VTKM_DEFINE_CELL_TRAITS(name, dimensions, numPoints) \
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template <> \
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struct CellTraits<vtkm::CellShapeTag##name> \
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{ \
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static constexpr vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = dimensions; \
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using TopologicalDimensionsTag = vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>; \
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using IsSizeFixed = vtkm::CellTraitsTagSizeFixed; \
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static constexpr vtkm::IdComponent NUM_POINTS = numPoints; \
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}
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#define VTKM_DEFINE_CELL_TRAITS_VARIABLE(name, dimensions) \
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template <> \
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struct CellTraits<vtkm::CellShapeTag##name> \
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{ \
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static constexpr vtkm::IdComponent TOPOLOGICAL_DIMENSIONS = dimensions; \
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using TopologicalDimensionsTag = vtkm::CellTopologicalDimensionsTag<TOPOLOGICAL_DIMENSIONS>; \
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using IsSizeFixed = vtkm::CellTraitsTagSizeVariable; \
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}
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VTKM_DEFINE_CELL_TRAITS(Empty, 0, 0);
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VTKM_DEFINE_CELL_TRAITS(Vertex, 0, 1);
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//VTKM_DEFINE_CELL_TRAITS_VARIABLE(PolyVertex, 0);
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VTKM_DEFINE_CELL_TRAITS(Line, 1, 2);
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VTKM_DEFINE_CELL_TRAITS_VARIABLE(PolyLine, 1);
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VTKM_DEFINE_CELL_TRAITS(Triangle, 2, 3);
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//VTKM_DEFINE_CELL_TRAITS_VARIABLE(TriangleStrip, 2);
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VTKM_DEFINE_CELL_TRAITS_VARIABLE(Polygon, 2);
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//VTKM_DEFINE_CELL_TRAITS(Pixel, 2, 4);
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VTKM_DEFINE_CELL_TRAITS(Quad, 2, 4);
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VTKM_DEFINE_CELL_TRAITS(Tetra, 3, 4);
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//VTKM_DEFINE_CELL_TRAITS(Voxel, 3, 8);
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VTKM_DEFINE_CELL_TRAITS(Hexahedron, 3, 8);
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VTKM_DEFINE_CELL_TRAITS(Wedge, 3, 6);
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VTKM_DEFINE_CELL_TRAITS(Pyramid, 3, 5);
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#undef VTKM_DEFINE_CELL_TRAITS
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} // namespace vtkm
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#endif //vtk_m_CellTraits_h
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