foamVtkSurfaceWriter.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2018-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "foamVtkSurfaceWriter.H"
#include "foamVtkOutput.H"
#include "globalIndex.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
void Foam::vtk::surfaceWriter::beginPiece()
{
    // Basic sizes
    nLocalPoints_ = points_.get().size();
    nLocalFaces_  = faces_.get().size();
    nLocalVerts_  = 0;
 
    for (const face& f : faces_.get())
    {
        nLocalVerts_ += f.size();
    }
 
    numberOfPoints_ = nLocalPoints_;
    numberOfCells_  = nLocalFaces_;
 
    if (parallel_)
    {
        reduce(numberOfPoints_, sumOp<label>());
        reduce(numberOfCells_,  sumOp<label>());
    }
 
 
    // Nothing else to do for legacy
    if (legacy()) return;
 
    if (format_)
    {
        format().tag
        (
            vtk::fileTag::PIECE,
            vtk::fileAttr::NUMBER_OF_POINTS, numberOfPoints_,
            vtk::fileAttr::NUMBER_OF_POLYS,  numberOfCells_
        );
    }
}
 
 
void Foam::vtk::surfaceWriter::writePoints()
{
    if (format_)
    {
        if (legacy())
        {
            legacy::beginPoints(os_, numberOfPoints_);
        }
        else
        {
            const uint64_t payLoad = vtk::sizeofData<float, 3>(numberOfPoints_);
 
            format()
                .tag(vtk::fileTag::POINTS)
                .beginDataArray<float,3>(vtk::dataArrayAttr::POINTS);
 
            format().writeSize(payLoad);
        }
    }
 
 
    if (parallel_ ? Pstream::master() : true)
    {
        {
            vtk::writeList(format(), points_.get());
        }
    }
 
 
    if (parallel_)
    {
        if (Pstream::master())
        {
            pointField recv;
 
            // Receive each point field and write
            for (const int slave : Pstream::subProcs())
            {
                IPstream fromSlave(Pstream::commsTypes::blocking, slave);
 
                {
                    fromSlave >> recv;
 
                    vtk::writeList(format(), recv);
                }
            }
        }
        else
        {
            // Send to master
            OPstream toMaster
            (
                Pstream::commsTypes::blocking,
                Pstream::masterNo()
            );
 
            {
                toMaster << points_.get();
            }
        }
    }
 
 
    if (format_)
    {
        format().flush();
        format().endDataArray();
 
        if (!legacy())
        {
            format()
                .endTag(vtk::fileTag::POINTS);
        }
    }
}
 
 
void Foam::vtk::surfaceWriter::writePolysLegacy(const label pointOffset)
{
    // Connectivity count without additional storage (done internally)
 
    label nFaces = nLocalFaces_;
    label nVerts = nLocalVerts_;
 
    if (parallel_)
    {
        reduce(nFaces, sumOp<label>());
        reduce(nVerts, sumOp<label>());
    }
 
    if (nFaces != numberOfCells_)
    {
        FatalErrorInFunction
            << "Expecting " << numberOfCells_
            << " faces, but found " << nFaces
            << exit(FatalError);
    }
 
    legacy::beginPolys(os_, nFaces, nVerts);
 
    labelList vertLabels(nLocalFaces_ + nLocalVerts_);
 
    {
        // Legacy: size + connectivity together
        // [nPts, id1, id2, ..., nPts, id1, id2, ...]
 
        auto iter = vertLabels.begin();
 
        label off = pointOffset;
 
        {
            for (const face& f : faces_.get())
            {
                *iter = f.size();       // The size prefix
                ++iter;
 
                for (const label pfi : f)
                {
                    *iter = pfi + off;  // Face vertex label
                    ++iter;
                }
            }
            // off += points_.get().size();
        }
    }
 
 
    if (parallel_)
    {
        vtk::writeListParallel(format_.ref(), vertLabels);
    }
    else
    {
        vtk::writeList(format(), vertLabels);
    }
 
    if (format_)
    {
        format().flush();
    }
}
 
 
void Foam::vtk::surfaceWriter::writePolys(const label pointOffset)
{
    if (format_)
    {
        format().tag(vtk::fileTag::POLYS);
    }
 
    //
    // 'connectivity'
    //
    {
        labelList vertLabels(nLocalVerts_);
 
        label nVerts = nLocalVerts_;
 
        if (parallel_)
        {
            reduce(nVerts, sumOp<label>());
        }
 
        if (format_)
        {
            const uint64_t payLoad = vtk::sizeofData<label>(nVerts);
 
            format().beginDataArray<label>(vtk::dataArrayAttr::CONNECTIVITY);
            format().writeSize(payLoad * sizeof(label));
        }
 
        {
            // XML: connectivity only
            // [id1, id2, ..., id1, id2, ...]
 
            auto iter = vertLabels.begin();
 
            label off = pointOffset;
 
            {
                for (const face& f : faces_.get())
                {
                    for (const label pfi : f)
                    {
                        *iter = pfi + off;  // Face vertex label
                        ++iter;
                    }
                }
                // off += points_.get().size();
            }
        }
 
 
        if (parallel_)
        {
            vtk::writeListParallel(format_.ref(), vertLabels);
        }
        else
        {
            vtk::writeList(format(), vertLabels);
        }
 
        if (format_)
        {
            format().flush();
            format().endDataArray();
        }
    }
 
 
    //
    // 'offsets'  (connectivity offsets)
    //
    {
        labelList vertOffsets(nLocalFaces_);
        label nOffs = vertOffsets.size();
 
        if (parallel_)
        {
            reduce(nOffs, sumOp<label>());
        }
 
        if (format_)
        {
            const uint64_t payLoad = vtk::sizeofData<label>(nOffs);
 
            format().beginDataArray<label>(vtk::dataArrayAttr::OFFSETS);
            format().writeSize(payLoad);
        }
 
 
        // processor-local connectivity offsets
        label off =
        (
            parallel_ ? globalIndex(nLocalVerts_).localStart() : 0
        );
 
 
        auto iter = vertOffsets.begin();
 
        {
            for (const face& f : faces_.get())
            {
                off += f.size();   // End offset
                *iter = off;
                ++iter;
            }
        }
 
 
        if (parallel_)
        {
            vtk::writeListParallel(format_.ref(), vertOffsets);
        }
        else
        {
            vtk::writeList(format_.ref(), vertOffsets);
        }
 
 
        if (format_)
        {
            format().flush();
            format().endDataArray();
        }
    }
 
    if (format_)
    {
        format().endTag(vtk::fileTag::POLYS);
    }
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
Foam::vtk::surfaceWriter::surfaceWriter
(
    const pointField& points,
    const faceList& faces,
    const vtk::outputOptions opts
)
:
    vtk::fileWriter(vtk::fileTag::POLY_DATA, opts),
    points_(std::cref<pointField>(points)),
    faces_(std::cref<faceList>(faces)),
    numberOfPoints_(0),
    numberOfCells_(0),
    nLocalPoints_(0),
    nLocalFaces_(0),
    nLocalVerts_(0),
    instant_()
{
    // We do not currently support append mode
    opts_.append(false);
}
 
 
Foam::vtk::surfaceWriter::surfaceWriter
(
    const pointField& points,
    const faceList& faces,
    const fileName& file,
    bool parallel
)
:
    surfaceWriter(points, faces)
{
    open(file, parallel);
}
 
 
Foam::vtk::surfaceWriter::surfaceWriter
(
    const pointField& points,
    const faceList& faces,
    const vtk::outputOptions opts,
    const fileName& file,
    bool parallel
)
:
    surfaceWriter(points, faces, opts)
{
    open(file, parallel);
}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
void Foam::vtk::surfaceWriter::setTime(const instant& inst)
{
    instant_ = inst;
}
 
 
bool Foam::vtk::surfaceWriter::beginFile(std::string title)
{
    if (title.size())
    {
        return vtk::fileWriter::beginFile(title);
    }
 
    if (instant_.name().size())
    {
        return vtk::fileWriter::beginFile
        (
            "time='" + instant_.name() + "'"
        );
    }
 
    // Provide default title
    return vtk::fileWriter::beginFile("surface");
}
 
 
bool Foam::vtk::surfaceWriter::writeGeometry()
{
    enter_Piece();
 
    beginPiece();
 
    writePoints();
 
    const label pointOffset =
    (
        parallel_ ? globalIndex(nLocalPoints_).localStart() : 0
    );
 
    if (legacy())
    {
        writePolysLegacy(pointOffset);
    }
    else
    {
        writePolys(pointOffset);
    }
 
    return true;
}
 
 
bool Foam::vtk::surfaceWriter::beginCellData(label nFields)
{
    return enter_CellData(numberOfCells_, nFields);
}
 
 
bool Foam::vtk::surfaceWriter::beginPointData(label nFields)
{
    return enter_PointData(numberOfPoints_, nFields);
}
 
 
void Foam::vtk::surfaceWriter::writeTimeValue()
{
    if (instant_.name().size())
    {
        vtk::fileWriter::writeTimeValue(instant_.value());
    }
}
 
 
void Foam::vtk::surfaceWriter::piece
(
    const pointField& points,
    const faceList& faces
)
{
    endPiece();
 
    points_ = std::cref<pointField>(points);
    faces_ = std::cref<faceList>(faces);
}
 
 
// ************************************************************************* //