load.h

/*****************************************************************************
 * VCLib                                                                     *
 * Visual Computing Library                                                  *
 *                                                                           *
 * Copyright(C) 2021-2025                                                    *
 * Visual Computing Lab                                                      *
 * ISTI - Italian National Research Council                                  *
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 * All rights reserved.                                                      *
 *                                                                           *
 * This program is free software; you can redistribute it and/or modify      *
 * it under the terms of the Mozilla Public License Version 2.0 as published *
 * by the Mozilla Foundation; either version 2 of the License, or            *
 * (at your option) any later version.                                       *
 *                                                                           *
 * This program 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              *
 * Mozilla Public License Version 2.0                                        *
 * (https://www.mozilla.org/en-US/MPL/2.0/) for more details.                *
 ****************************************************************************/
 
#ifndef VCL_IO_MESH_PLY_LOAD_H
#define VCL_IO_MESH_PLY_LOAD_H
 
#include "detail/edge.h"
#include "detail/extra.h"
#include "detail/face.h"
#include "detail/tristrip.h"
#include "detail/vertex.h"
 
#include <vclib/io/mesh/settings.h>
 
#include <vclib/space/complex.h>
 
namespace vcl {
 
namespace detail {
 
template<MeshConcept MeshType, LoggerConcept LogType = NullLogger>
void loadPly(
    MeshType&           m,
    std::istream&       file,
    const std::string&  filename,
    MeshInfo&           loadedInfo,
    const LoadSettings& settings = LoadSettings(),
    LogType&            log      = nullLogger)
{
    PlyHeader header(file, filename);
    if (header.errorWhileLoading())
        throw MalformedFileException("Header not valid: " + filename);
 
    m.clear();
 
    loadedInfo = header.getInfo();
 
    if (settings.enableOptionalComponents)
        enableOptionalComponentsFromInfo(loadedInfo, m);
 
    if constexpr (HasName<MeshType>) {
        m.name() = FileInfo::fileNameWithoutExtension(filename);
    }
    if constexpr (HasTexturePaths<MeshType>) {
        m.meshBasePath() = FileInfo::pathWithoutFileName(filename);
    }
 
    // for logging
    std::vector<uint> eln;
    uint              sum = 0;
    for (const PlyElement& el : header) {
        eln.push_back(el.numberElements);
        sum += el.numberElements;
    }
 
    try {
        uint currElems = 0;
        uint i         = 0;
        for (const PlyElement& el : header) {
            double beginPerc = double(currElems) / sum * 100.0;
            double endPerc   = double(currElems + eln[i]) / sum * 100.0;
 
            switch (el.type) {
            case ply::VERTEX:
                log.startNewTask(beginPerc, endPerc, "Reading vertices");
                readPlyVertices(file, header, m, log);
                log.endTask("Reading vertices");
                break;
            case ply::FACE:
                log.startNewTask(beginPerc, endPerc, "Reading faces");
                if constexpr (HasFaces<MeshType>)
                    readPlyFaces(file, header, m, loadedInfo, log);
                else
                    readPlyUnknownElement(file, header, el, log);
                log.endTask("Reading faces");
                break;
            case ply::TRISTRIP:
                log.startNewTask(beginPerc, endPerc, "Reading tristrips");
                if constexpr (HasFaces<MeshType>) {
                    loadedInfo.setTriangleMesh();
                    readPlyTriStrips(file, header, m, log);
                }
                else
                    readPlyUnknownElement(file, header, el, log);
                log.endTask("Reading tristrips");
                break;
            case ply::EDGE:
                log.startNewTask(beginPerc, endPerc, "Reading edges");
                if constexpr (HasEdges<MeshType>)
                    readPlyEdges(file, header, m, log);
                else
                    readPlyUnknownElement(file, header, el, log);
                log.endTask("Reading edges");
                break;
            default:
                log.startNewTask(
                    beginPerc, endPerc, "Reading unknown elements");
                readPlyUnknownElement(file, header, el, log);
                log.endTask("Reading unknown elements");
                break;
            }
            currElems += eln[i];
            ++i;
        }
        readPlyTextures(header, m, log, settings);
    }
    catch (const std::runtime_error& err) {
        m.clear();
        throw err;
    }
}
 
} // namespace detail
 
template<MeshConcept MeshType, LoggerConcept LogType = NullLogger>
void loadPly(
    MeshType&           m,
    std::istream&       inputPlyStream,
    MeshInfo&           loadedInfo,
    const LoadSettings& settings = LoadSettings(),
    LogType&            log      = nullLogger)
{
    detail::loadPly(m, inputPlyStream, "", loadedInfo, settings, log);
}
 
template<MeshConcept MeshType, LoggerConcept LogType = NullLogger>
void loadPly(
    MeshType&           m,
    const std::string&  filename,
    MeshInfo&           loadedInfo,
    const LoadSettings& settings = LoadSettings(),
    LogType&            log      = nullLogger)
{
    std::ifstream file = openInputFileStream(filename);
 
    detail::loadPly(m, file, filename, loadedInfo, settings, log);
}
 
} // namespace vcl
 
#endif // VCL_IO_MESH_PLY_LOAD_H