mesh.cpp Example File | Qt GUI 5.12.8

- Qt 5.12
- Qt GUI
- Hello Vulkan Cubes Example
- mesh.cpp Example File
- Qt 5.12.8 Reference Documentation

# mesh.cpp Example File

hellovulkancubes/mesh.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2017 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see https://www.qt.io/terms-conditions. For further
     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** BSD License Usage
     ** Alternatively, you may use this file under the terms of the BSD license
     ** as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include "mesh.h"
     #include <QtConcurrentRun>
     #include <QFile>

     void Mesh::load(const QString &fn)
     {
         reset();
         m_maybeRunning = true;
         m_future = QtConcurrent::run([fn]() {
             MeshData md;
             QFile f(fn);
             if (!f.open(QIODevice::ReadOnly)) {
                 qWarning("Failed to open %s", qPrintable(fn));
                 return md;
             }
             QByteArray buf = f.readAll();
             const char *p = buf.constData();
             quint32 format;
             memcpy(&format, p, 4);
             if (format != 1) {
                 qWarning("Invalid format in %s", qPrintable(fn));
                 return md;
             }
             int ofs = 4;
             memcpy(&md.vertexCount, p + ofs, 4);
             ofs += 4;
             memcpy(md.aabb, p + ofs, 6 * 4);
             ofs += 6 * 4;
             const int byteCount = md.vertexCount * 8 * 4;
             md.geom.resize(byteCount);
             memcpy(md.geom.data(), p + ofs, byteCount);
             return md;
         });
     }

     MeshData *Mesh::data()
     {
         if (m_maybeRunning && !m_data.isValid())
             m_data = m_future.result();

         return &m_data;
     }

     void Mesh::reset()
     {
         *data() = MeshData();
         m_maybeRunning = false;
     }