mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
90 lines
3.2 KiB
C++
90 lines
3.2 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_worklet_TriangulateStructured_h
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#define vtk_m_worklet_TriangulateStructured_h
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#include <vtkm/cont/ArrayCopy.h>
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#include <vtkm/cont/ArrayHandle.h>
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#include <vtkm/cont/ArrayHandleGroupVec.h>
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#include <vtkm/cont/CellSetSingleType.h>
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#include <vtkm/cont/CellSetStructured.h>
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#include <vtkm/cont/DataSet.h>
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#include <vtkm/cont/ErrorBadValue.h>
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#include <vtkm/cont/Field.h>
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#include <vtkm/worklet/DispatcherMapTopology.h>
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#include <vtkm/worklet/ScatterUniform.h>
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#include <vtkm/worklet/WorkletMapTopology.h>
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namespace vtkm
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{
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namespace worklet
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{
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namespace triangulate
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{
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//
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// Worklet to turn quads into triangles
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// Vertices remain the same and each cell is processed with needing topology
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//
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class TriangulateCell : public vtkm::worklet::WorkletVisitCellsWithPoints
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{
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public:
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using ControlSignature = void(CellSetIn cellset, FieldOutCell connectivityOut);
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using ExecutionSignature = void(PointIndices, _2, VisitIndex);
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using InputDomain = _1;
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using ScatterType = vtkm::worklet::ScatterUniform<2>;
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// Each quad cell produces 2 triangle cells
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template <typename ConnectivityInVec, typename ConnectivityOutVec>
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VTKM_EXEC void operator()(const ConnectivityInVec& connectivityIn,
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ConnectivityOutVec& connectivityOut,
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vtkm::IdComponent visitIndex) const
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{
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VTKM_STATIC_CONSTEXPR_ARRAY vtkm::IdComponent StructuredTriangleIndices[2][3] = { { 0, 1, 2 },
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{ 0, 2, 3 } };
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connectivityOut[0] = connectivityIn[StructuredTriangleIndices[visitIndex][0]];
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connectivityOut[1] = connectivityIn[StructuredTriangleIndices[visitIndex][1]];
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connectivityOut[2] = connectivityIn[StructuredTriangleIndices[visitIndex][2]];
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}
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};
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}
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/// \brief Compute the triangulate cells for a uniform grid data set
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class TriangulateStructured
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{
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public:
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template <typename CellSetType>
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vtkm::cont::CellSetSingleType<> Run(const CellSetType& cellSet,
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vtkm::cont::ArrayHandle<vtkm::IdComponent>& outCellsPerCell)
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{
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vtkm::cont::CellSetSingleType<> outCellSet;
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vtkm::cont::ArrayHandle<vtkm::Id> connectivity;
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vtkm::worklet::DispatcherMapTopology<triangulate::TriangulateCell> dispatcher;
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dispatcher.Invoke(cellSet, vtkm::cont::make_ArrayHandleGroupVec<3>(connectivity));
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// Fill in array of output cells per input cell
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vtkm::cont::ArrayCopy(
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vtkm::cont::ArrayHandleConstant<vtkm::IdComponent>(2, cellSet.GetNumberOfCells()),
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outCellsPerCell);
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// Add cells to output cellset
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outCellSet.Fill(cellSet.GetNumberOfPoints(), vtkm::CellShapeTagTriangle::Id, 3, connectivity);
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return outCellSet;
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}
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};
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}
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} // namespace vtkm::worklet
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#endif // vtk_m_worklet_TriangulateStructured_h
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