mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
88 lines
2.4 KiB
C++
88 lines
2.4 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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#include <vtkm/io/VTKUnstructuredGridReader.h>
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#include <vtkm/io/internal/VTKDataSetCells.h>
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namespace vtkm
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{
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namespace io
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{
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VTKUnstructuredGridReader::VTKUnstructuredGridReader(const char* fileName)
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: VTKDataSetReaderBase(fileName)
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{
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}
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VTKUnstructuredGridReader::VTKUnstructuredGridReader(const std::string& fileName)
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: VTKDataSetReaderBase(fileName)
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{
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}
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void VTKUnstructuredGridReader::Read()
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{
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if (this->DataFile->Structure != vtkm::io::internal::DATASET_UNSTRUCTURED_GRID)
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{
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throw vtkm::io::ErrorIO("Incorrect DataSet type");
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}
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//We need to be able to handle VisIt files which dump Field data
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//at the top of a VTK file
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std::string tag;
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this->DataFile->Stream >> tag;
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if (tag == "FIELD")
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{
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this->ReadGlobalFields();
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this->DataFile->Stream >> tag;
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}
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// Read the points
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internal::parseAssert(tag == "POINTS");
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this->ReadPoints();
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vtkm::Id numPoints = this->DataSet.GetNumberOfPoints();
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// Read the cellset
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vtkm::cont::ArrayHandle<vtkm::Id> connectivity;
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vtkm::cont::ArrayHandle<vtkm::IdComponent> numIndices;
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vtkm::cont::ArrayHandle<vtkm::UInt8> shapes;
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this->DataFile->Stream >> tag;
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internal::parseAssert(tag == "CELLS");
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this->ReadCells(connectivity, numIndices);
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this->ReadShapes(shapes);
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vtkm::cont::ArrayHandle<vtkm::Id> permutation;
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vtkm::io::internal::FixupCellSet(connectivity, numIndices, shapes, permutation);
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this->SetCellsPermutation(permutation);
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if (vtkm::io::internal::IsSingleShape(shapes))
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{
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vtkm::cont::CellSetSingleType<> cellSet;
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cellSet.Fill(
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numPoints, shapes.ReadPortal().Get(0), numIndices.ReadPortal().Get(0), connectivity);
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this->DataSet.SetCellSet(cellSet);
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}
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else
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{
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auto offsets = vtkm::cont::ConvertNumIndicesToOffsets(numIndices);
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vtkm::cont::CellSetExplicit<> cellSet;
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cellSet.Fill(numPoints, shapes, connectivity, offsets);
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this->DataSet.SetCellSet(cellSet);
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}
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// Read points and cell attributes
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this->ReadAttributes();
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}
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}
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}
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