hellovulkanwidget.cpp Example File

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 #include "hellovulkanwidget.h"
 #include <QVulkanFunctions>
 #include <QApplication>
 #include <QVBoxLayout>
 #include <QPlainTextEdit>
 #include <QPushButton>
 #include <QLCDNumber>
 #include <QFileDialog>
 #include <QMessageBox>
 #include <QTabWidget>

 MainWindow::MainWindow(VulkanWindow *w, QPlainTextEdit *logWidget)
     : m_window(w)
 {
     QWidget *wrapper = QWidget::createWindowContainer(w);

     m_info = new QPlainTextEdit;
     m_info->setReadOnly(true);

     m_number = new QLCDNumber(3);
     m_number->setSegmentStyle(QLCDNumber::Filled);

     QPushButton *grabButton = new QPushButton(tr("&Grab"));
     grabButton->setFocusPolicy(Qt::NoFocus);

     connect(grabButton, &QPushButton::clicked, this, &MainWindow::onGrabRequested);

     QPushButton *quitButton = new QPushButton(tr("&Quit"));
     quitButton->setFocusPolicy(Qt::NoFocus);

     connect(quitButton, &QPushButton::clicked, qApp, &QCoreApplication::quit);

     QVBoxLayout *layout = new QVBoxLayout;
     m_infoTab = new QTabWidget(this);
     m_infoTab->addTab(m_info, tr("Vulkan Info"));
     m_infoTab->addTab(logWidget, tr("Debug Log"));
     layout->addWidget(m_infoTab, 2);
     layout->addWidget(m_number, 1);
     layout->addWidget(wrapper, 5);
     layout->addWidget(grabButton, 1);
     layout->addWidget(quitButton, 1);
     setLayout(layout);
 }

 void MainWindow::onVulkanInfoReceived(const QString &text)
 {
     m_info->setPlainText(text);
 }

 void MainWindow::onFrameQueued(int colorValue)
 {
     m_number->display(colorValue);
 }

 void MainWindow::onGrabRequested()
 {
     if (!m_window->supportsGrab()) {
         QMessageBox::warning(this, tr("Cannot grab"), tr("This swapchain does not support readbacks."));
         return;
     }

     QImage img = m_window->grab();

     // Our startNextFrame() implementation is synchronous so img is ready to be
     // used right here.

     QFileDialog fd(this);
     fd.setAcceptMode(QFileDialog::AcceptSave);
     fd.setDefaultSuffix("png");
     fd.selectFile("test.png");
     if (fd.exec() == QDialog::Accepted)
         img.save(fd.selectedFiles().first());
 }

 QVulkanWindowRenderer *VulkanWindow::createRenderer()
 {
     return new VulkanRenderer(this);
 }

 VulkanRenderer::VulkanRenderer(VulkanWindow *w)
     : TriangleRenderer(w)
 {
 }

 void VulkanRenderer::initResources()
 {
     TriangleRenderer::initResources();

     QVulkanInstance *inst = m_window->vulkanInstance();
     m_devFuncs = inst->deviceFunctions(m_window->device());

     QString info;
     info += QString().sprintf("Number of physical devices: %d\n", m_window->availablePhysicalDevices().count());

     QVulkanFunctions *f = inst->functions();
     VkPhysicalDeviceProperties props;
     f->vkGetPhysicalDeviceProperties(m_window->physicalDevice(), &props);
     info += QString().sprintf("Active physical device name: '%s' version %d.%d.%d\nAPI version %d.%d.%d\n",
                               props.deviceName,
                               VK_VERSION_MAJOR(props.driverVersion), VK_VERSION_MINOR(props.driverVersion),
                               VK_VERSION_PATCH(props.driverVersion),
                               VK_VERSION_MAJOR(props.apiVersion), VK_VERSION_MINOR(props.apiVersion),
                               VK_VERSION_PATCH(props.apiVersion));

     info += QStringLiteral("Supported instance layers:\n");
     for (const QVulkanLayer &layer : inst->supportedLayers())
         info += QString().sprintf("    %s v%u\n", layer.name.constData(), layer.version);
     info += QStringLiteral("Enabled instance layers:\n");
     for (const QByteArray &layer : inst->layers())
         info += QString().sprintf("    %s\n", layer.constData());

     info += QStringLiteral("Supported instance extensions:\n");
     for (const QVulkanExtension &ext : inst->supportedExtensions())
         info += QString().sprintf("    %s v%u\n", ext.name.constData(), ext.version);
     info += QStringLiteral("Enabled instance extensions:\n");
     for (const QByteArray &ext : inst->extensions())
         info += QString().sprintf("    %s\n", ext.constData());

     info += QString().sprintf("Color format: %u\nDepth-stencil format: %u\n",
                               m_window->colorFormat(), m_window->depthStencilFormat());

     info += QStringLiteral("Supported sample counts:");
     const QVector<int> sampleCounts = m_window->supportedSampleCounts();
     for (int count : sampleCounts)
         info += QLatin1Char(' ') + QString::number(count);
     info += QLatin1Char('\n');

     emit static_cast<VulkanWindow *>(m_window)->vulkanInfoReceived(info);
 }

 void VulkanRenderer::startNextFrame()
 {
     TriangleRenderer::startNextFrame();
     emit static_cast<VulkanWindow *>(m_window)->frameQueued(int(m_rotation) % 360);
 }