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50
51#include <QApplication>
52#include <QDesktopWidget>
53#include <QSurfaceFormat>
54#include <QCommandLineParser>
55#include <QCommandLineOption>
56
57#include "glwidget.h"
58#include "mainwindow.h"
59
60int main(int argc, char *argv[])
61{
62 QApplication app(argc, argv);
63
64 QCoreApplication::setApplicationName("Qt Hello GL 2 Example");
65 QCoreApplication::setOrganizationName("QtProject");
66 QCoreApplication::setApplicationVersion(QT_VERSION_STR);
67 QCommandLineParser parser;
68 parser.setApplicationDescription(QCoreApplication::applicationName());
69 parser.addHelpOption();
70 parser.addVersionOption();
71 QCommandLineOption multipleSampleOption("multisample", "Multisampling");
72 parser.addOption(commandLineOption: multipleSampleOption);
73 QCommandLineOption coreProfileOption("coreprofile", "Use core profile");
74 parser.addOption(commandLineOption: coreProfileOption);
75 QCommandLineOption transparentOption("transparent", "Transparent window");
76 parser.addOption(commandLineOption: transparentOption);
77
78 parser.process(app);
79
80 QSurfaceFormat fmt;
81 fmt.setDepthBufferSize(24);
82 if (parser.isSet(option: multipleSampleOption))
83 fmt.setSamples(4);
84 if (parser.isSet(option: coreProfileOption)) {
85 fmt.setVersion(major: 3, minor: 2);
86 fmt.setProfile(QSurfaceFormat::CoreProfile);
87 }
88 QSurfaceFormat::setDefaultFormat(fmt);
89
90 MainWindow mainWindow;
91
92 GLWidget::setTransparent(parser.isSet(option: transparentOption));
93 if (GLWidget::isTransparent()) {
94 mainWindow.setAttribute(Qt::WA_TranslucentBackground);
95 mainWindow.setAttribute(Qt::WA_NoSystemBackground, on: false);
96 }
97 mainWindow.resize(mainWindow.sizeHint());
98 int desktopArea = QApplication::desktop()->width() *
99 QApplication::desktop()->height();
100 int widgetArea = mainWindow.width() * mainWindow.height();
101 if (((float)widgetArea / (float)desktopArea) < 0.75f)
102 mainWindow.show();
103 else
104 mainWindow.showMaximized();
105 return app.exec();
106}
107

source code of qtbase/examples/opengl/hellogl2/main.cpp