1/****************************************************************************
2**
3** Copyright (C) 2017 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "mesh.h"
52#include <QtConcurrentRun>
53#include <QFile>
54
55void Mesh::load(const QString &fn)
56{
57 reset();
58 m_maybeRunning = true;
59 m_future = QtConcurrent::run([fn]() {
60 MeshData md;
61 QFile f(fn);
62 if (!f.open(QIODevice::ReadOnly)) {
63 qWarning("Failed to open %s", qPrintable(fn));
64 return md;
65 }
66 QByteArray buf = f.readAll();
67 const char *p = buf.constData();
68 quint32 format;
69 memcpy(&format, p, 4);
70 if (format != 1) {
71 qWarning("Invalid format in %s", qPrintable(fn));
72 return md;
73 }
74 int ofs = 4;
75 memcpy(&md.vertexCount, p + ofs, 4);
76 ofs += 4;
77 memcpy(md.aabb, p + ofs, 6 * 4);
78 ofs += 6 * 4;
79 const int byteCount = md.vertexCount * 8 * 4;
80 md.geom.resize(byteCount);
81 memcpy(md.geom.data(), p + ofs, byteCount);
82 return md;
83 });
84}
85
86MeshData *Mesh::data()
87{
88 if (m_maybeRunning && !m_data.isValid())
89 m_data = m_future.result();
90
91 return &m_data;
92}
93
94void Mesh::reset()
95{
96 *data() = MeshData();
97 m_maybeRunning = false;
98}
99