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

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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::asprintf("Number of physical devices: %d\n", m_window->availablePhysicalDevices().count());

    QVulkanFunctions *f = inst->functions();
    VkPhysicalDeviceProperties props;
    f->vkGetPhysicalDeviceProperties(m_window->physicalDevice(), &props);
    info += QString::asprintf("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::asprintf("    %s v%u\n", layer.name.constData(), layer.version);
    info += QStringLiteral("Enabled instance layers:\n");
    for (const QByteArray &layer : inst->layers())
        info += QString::asprintf("    %s\n", layer.constData());

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

    info += QString::asprintf("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);
}