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);
  }