qtbase-opensource-src/examples/vulkan/hellovulkanwidget/main.cpp

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#include <QApplication>
#include <QPlainTextEdit>
#include <QVulkanInstance>
#include <QLibraryInfo>
#include <QLoggingCategory>
#include <QPointer>
#include "hellovulkanwidget.h"

Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")

static QPointer<QPlainTextEdit> messageLogWidget;
static QtMessageHandler oldMessageHandler = nullptr;

static void messageHandler(QtMsgType msgType, const QMessageLogContext &logContext, const QString &text)
{
    if (!messageLogWidget.isNull())
        messageLogWidget->appendPlainText(text);
    if (oldMessageHandler)
        oldMessageHandler(msgType, logContext, text);
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    messageLogWidget = new QPlainTextEdit(QLatin1String(QLibraryInfo::build()) + QLatin1Char('\n'));
    messageLogWidget->setReadOnly(true);

    oldMessageHandler = qInstallMessageHandler(messageHandler);

    QLoggingCategory::setFilterRules(QStringLiteral("qt.vulkan=true"));

    QVulkanInstance inst;

#ifndef Q_OS_ANDROID
    inst.setLayers(QByteArrayList() << "VK_LAYER_LUNARG_standard_validation");
#else
    inst.setLayers(QByteArrayList()
                   << "VK_LAYER_GOOGLE_threading"
                   << "VK_LAYER_LUNARG_parameter_validation"
                   << "VK_LAYER_LUNARG_object_tracker"
                   << "VK_LAYER_LUNARG_core_validation"
                   << "VK_LAYER_LUNARG_image"
                   << "VK_LAYER_LUNARG_swapchain"
                   << "VK_LAYER_GOOGLE_unique_objects");
#endif

    if (!inst.create())
        qFatal("Failed to create Vulkan instance: %d", inst.errorCode());

    VulkanWindow *vulkanWindow = new VulkanWindow;
    vulkanWindow->setVulkanInstance(&inst);

    MainWindow mainWindow(vulkanWindow, messageLogWidget.data());
    QObject::connect(vulkanWindow, &VulkanWindow::vulkanInfoReceived, &mainWindow, &MainWindow::onVulkanInfoReceived);
    QObject::connect(vulkanWindow, &VulkanWindow::frameQueued, &mainWindow, &MainWindow::onFrameQueued);

    mainWindow.resize(1024, 768);
    mainWindow.show();

    return app.exec();
}