1/****************************************************************************
2**
3** Copyright (C) 2016 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 <QApplication>
52#include <QMainWindow>
53#include <QScreen>
54#include <QSurfaceFormat>
55#include <QOpenGLContext>
56#include <QCommandLineParser>
57#include <QCommandLineOption>
58#include "mainwindow.h"
59#include "glwidget.h"
60
61#include <memory>
62
63static QString getGlString(QOpenGLFunctions *functions, GLenum name)
64{
65 if (const GLubyte *p = functions->glGetString(name))
66 return QString::fromLatin1(reinterpret_cast<const char *>(p));
67 return QString();
68}
69
70int main( int argc, char ** argv )
71{
72 QApplication a( argc, argv );
73
74 QCoreApplication::setApplicationName("Qt Threaded QOpenGLWidget Example");
75 QCoreApplication::setOrganizationName("QtProject");
76 QCoreApplication::setApplicationVersion(QT_VERSION_STR);
77 QCommandLineParser parser;
78 parser.setApplicationDescription(QCoreApplication::applicationName());
79 parser.addHelpOption();
80 parser.addVersionOption();
81 QCommandLineOption singleOption("single", "Single thread");
82 parser.addOption(singleOption);
83 parser.process(a);
84
85 QSurfaceFormat format;
86 format.setDepthBufferSize(16);
87 QSurfaceFormat::setDefaultFormat(format);
88
89 // Two top-level windows with two QOpenGLWidget children in each.
90 // The rendering for the four QOpenGLWidgets happens on four separate threads.
91
92 GLWidget topLevelGlWidget;
93 QPoint pos = topLevelGlWidget.screen()->availableGeometry().topLeft() + QPoint(200, 200);
94 topLevelGlWidget.setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example top level"));
95 topLevelGlWidget.resize(200, 200);
96 topLevelGlWidget.move(pos);
97 topLevelGlWidget.show();
98
99 const QString glInfo = getGlString(topLevelGlWidget.context()->functions(), GL_VENDOR)
100 + QLatin1Char('/') + getGlString(topLevelGlWidget.context()->functions(), GL_RENDERER);
101
102 const bool supportsThreading = !glInfo.contains(QLatin1String("nouveau"), Qt::CaseInsensitive)
103 && !glInfo.contains(QLatin1String("ANGLE"), Qt::CaseInsensitive)
104 && !glInfo.contains(QLatin1String("llvmpipe"), Qt::CaseInsensitive);
105
106 const QString toolTip = supportsThreading ? glInfo : glInfo + QStringLiteral("\ndoes not support threaded OpenGL.");
107 topLevelGlWidget.setToolTip(toolTip);
108
109 std::unique_ptr<MainWindow> mw1;
110 std::unique_ptr<MainWindow> mw2;
111 if (!parser.isSet(singleOption)) {
112 if (supportsThreading) {
113 pos += QPoint(100, 100);
114 mw1.reset(new MainWindow);
115 mw1->setToolTip(toolTip);
116 mw1->move(pos);
117 mw1->setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example #1"));
118 mw1->show();
119 pos += QPoint(100, 100);
120 mw2.reset(new MainWindow);
121 mw2->setToolTip(toolTip);
122 mw2->move(pos);
123 mw2->setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example #2"));
124 mw2->show();
125 } else {
126 qWarning() << toolTip;
127 }
128 }
129
130 return a.exec();
131}
132