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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(str: 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(commandLineOption: singleOption);
83 parser.process(app: 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(w: 200, h: 200);
96 topLevelGlWidget.move(pos);
97 topLevelGlWidget.show();
98
99 const QString glInfo = getGlString(functions: topLevelGlWidget.context()->functions(), GL_VENDOR)
100 + QLatin1Char('/') + getGlString(functions: topLevelGlWidget.context()->functions(), GL_RENDERER);
101
102 const bool supportsThreading = !glInfo.contains(s: QLatin1String("nouveau"), cs: Qt::CaseInsensitive)
103 && !glInfo.contains(s: QLatin1String("ANGLE"), cs: Qt::CaseInsensitive)
104 && !glInfo.contains(s: QLatin1String("llvmpipe"), cs: 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(option: singleOption)) {
112 if (supportsThreading) {
113 pos += QPoint(100, 100);
114 mw1.reset(p: 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(p: 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

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