qt5base-lts/examples/opengl/hellowindow/main.cpp

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#include <QGuiApplication>
#include <qpa/qplatformintegration.h>
#include <private/qguiapplication_p.h>
#include <QScreen>
#include <QThread>

#include "hellowindow.h"

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);

    const bool multipleWindows =
        QGuiApplicationPrivate::platformIntegration()->hasCapability(QPlatformIntegration::ThreadedOpenGL)
        && !QGuiApplication::arguments().contains(QLatin1String("--single"));

    QScreen *screen = QGuiApplication::primaryScreen();

    QRect screenGeometry = screen->availableGeometry();

    QSurfaceFormat format;
    format.setDepthBufferSize(16);
    format.setSamples(4);

    QPoint center = QPoint(screenGeometry.center().x(), screenGeometry.top() + 80);
    QSize windowSize(400, 320);
    int delta = 40;

    Renderer *rendererA = new Renderer(format);
    HelloWindow *windowA = new HelloWindow(rendererA);
    windowA->setGeometry(QRect(center, windowSize).translated(-windowSize.width() - delta / 2, 0));
    windowA->setWindowTitle(QLatin1String("Thread A - Context A"));
    windowA->setVisible(true);

    QList<QThread *> renderThreads;
    if (multipleWindows) {
        Renderer *rendererB = new Renderer(format, rendererA);

        QThread *renderThread = new QThread;
        rendererB->moveToThread(renderThread);
        renderThreads << renderThread;

        HelloWindow *windowB = new HelloWindow(rendererA);
        windowB->setGeometry(QRect(center, windowSize).translated(delta / 2, 0));
        windowB->setWindowTitle(QLatin1String("Thread A - Context A"));
        windowB->setVisible(true);

        HelloWindow *windowC = new HelloWindow(rendererB);
        windowC->setGeometry(QRect(center, windowSize).translated(-windowSize.width() / 2, windowSize.height() + delta));
        windowC->setWindowTitle(QLatin1String("Thread B - Context B"));
        windowC->setVisible(true);

        for (int i = 1; i < QGuiApplication::screens().size(); ++i) {
            QScreen *screen = QGuiApplication::screens().at(i);
            Renderer *renderer = new Renderer(format, rendererA, screen);

            renderThread = new QThread;
            renderer->moveToThread(renderThread);
            renderThreads << renderThread;

            QRect screenGeometry = screen->availableGeometry();
            QPoint center = screenGeometry.center();

            QSize windowSize = screenGeometry.size() * 0.8;

            HelloWindow *window = new HelloWindow(renderer);
            window->setScreen(screen);
            window->setGeometry(QRect(center, windowSize).translated(-windowSize.width() / 2, -windowSize.height() / 2));

            QChar id = QChar('B' + i);
            window->setWindowTitle(QLatin1String("Thread ") + id + QLatin1String(" - Context ") + id);
            window->setVisible(true);
        }
    }

    for (int i = 0; i < renderThreads.size(); ++i) {
        QObject::connect(qGuiApp, SIGNAL(lastWindowClosed()), renderThreads.at(i), SLOT(quit()));
        renderThreads.at(i)->start();
    }

    app.exec();

    for (int i = 0; i < renderThreads.size(); ++i)
        renderThreads.at(i)->wait();
}