Introduce QVulkanWindow

A convenience subclass of QWindow that provides a Vulkan-capable
window with a double-buffered FIFO swapchain.

While advanced use cases are better served by a custom QWindow
subclass, many applications can benefit from having a convenient
helper that makes getting started easier.

Add also three examples of increasing complexity, and a variant that
shows embeddeding into widgets via QWindowContainer.

[ChangeLog][QtGui] Added QVulkanWindow, a convenience subclass of
QWindow.

Task-number: QTBUG-55981
Change-Id: I6cdc9ff1390ac6258e278377233fd369a0bfeddc
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

examples/examples.pro

@@ -15,7 +15,10 @@ SUBDIRS = \
     widgets \
     xml
 
-qtHaveModule(gui):qtConfig(opengl): SUBDIRS += opengl
+qtHaveModule(gui) {
+    qtConfig(opengl): SUBDIRS += opengl
+    qtConfig(vulkan): SUBDIRS += vulkan
+}
 
 aggregate.files = aggregate/examples.pro
 aggregate.path = $$[QT_INSTALL_EXAMPLES]

examples/vulkan/doc/src/hellovulkantexture.qdoc

@@ -0,0 +1,41 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example hellovulkantexture
+    \ingroup examples-vulkan
+    \title Hello Vulkan Texture Vulkan Example
+    \brief Shows the basics of rendering with textures in a QVulkanWindow
+
+    The \e{Hello Vulkan Texture Example} builds on \l hellovulkantriangle. Here
+    instead of drawing a single triangle, a triangle strip is drawn in order to
+    get a quad on the screen. This is then textured using a QImage loaded from
+    a .png image file.
+
+    \image hellovulkantexture.png
+    \include examples-run.qdocinc
+*/

examples/vulkan/doc/src/hellovulkantriangle.qdoc

@@ -0,0 +1,49 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example hellovulkantriangle
+    \ingroup examples-vulkan
+    \title Hello Vulkan Triangle Example
+    \brief Shows the basics of rendering with QVulkanWindow and the Vulkan API
+
+    The \e{Hello Vulkan Triangle Example} builds on \l hellovulkanwindow. This
+    time a full graphics pipeline is created, including a vertex and fragment
+    shader. This pipeline is then used to render a triangle.
+
+    \image hellovulkantriangle.png
+
+    The example also demonstrates multisample antialiasing. Based on the
+    supported sample counts reported by QVulkanWindow::supportedSampleCounts()
+    the example chooses between 8x, 4x, or no multisampling. Once configured
+    via QVulkanWindow::setSamples(), QVulkanWindow takes care of the rest: the
+    additional multisample color buffers are created automatically, and
+    resolving into the swapchain buffers is performed at the end of the default
+    render pass for each frame.
+
+    \include examples-run.qdocinc
+*/

examples/vulkan/doc/src/hellovulkanwidget.qdoc

@@ -0,0 +1,49 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example hellovulkanwidget
+    \ingroup examples-vulkan
+    \title Hello Vulkan Widget Example
+    \brief Shows the usage of QVulkanWindow in QWidget applications
+
+    The \e{Hello Vulkan Widget Example} is a variant of \l hellovulkantriangle
+    that embeds the QVulkanWindow into a QWidget-based user interface using
+    QWidget::createWindowContainer().
+
+    \image hellovulkanwidget.png
+
+    The code to set up the Vulkan pipeline and render the triangle is the same
+    as in \l hellovulkantriangle. In addition, this example demonstrates
+    another feature of QVulkanWindow: reading the image content back from the
+    color buffer into a QImage. By clicking the Grab button, the example
+    renders the next frame and follows it up with a transfer operation in order
+    to get the swapchain color buffer content copied into host accessible
+    memory. The image is then saved to disk via QImage::save().
+
+    \include examples-run.qdocinc
+*/

examples/vulkan/doc/src/hellovulkanwindow.qdoc

@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:FDL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Free Documentation License Usage
+** Alternatively, this file may be used under the terms of the GNU Free
+** Documentation License version 1.3 as published by the Free Software
+** Foundation and appearing in the file included in the packaging of
+** this file. Please review the following information to ensure
+** the GNU Free Documentation License version 1.3 requirements
+** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*!
+    \example hellovulkanwindow
+    \title Hello Vulkan Window Example
+    \ingroup examples-vulkan
+    \brief Shows the basics of using QVulkanWindow
+
+    The \e{Hello Vulkan Window Example} shows the basics of using QVulkanWindow
+    in order to display rendering with the Vulkan graphics API on systems that
+    support this.
+
+    \image hellovulkanwindow.png
+
+    In this example there will be no actual rendering: it simply begins and
+    ends a render pass, which results in clearing the buffers to a fixed value.
+    The color buffer clear value changes on every frame.
+
+    \section1 Startup
+
+    Each Qt application using Vulkan will have to have a \c{Vulkan instance}
+    which encapsulates application-level state and initializes a Vulkan library.
+
+    A QVulkanWindow must always be associated with a QVulkanInstance and hence
+    the example performs instance creation before the window. The
+    QVulkanInstance object must also outlive the window.
+
+    \snippet hellovulkanwindow/main.cpp 0
+
+    The example enables validation layers, when supported. When the requested
+    layers are not present, the request will be ignored. Additional layers and
+    extensions can be enabled in a similar manner.
+
+    \snippet hellovulkanwindow/main.cpp 1
+
+    Once the instance is ready, it is time to create a window. Note that \c w
+    lives on the stack and is declared after \c inst.
+
+    \section1 The QVulkanWindow Subclass
+
+    To add custom functionality to a QVulkanWindow, subclassing is used. This
+    follows the existing patterns from QOpenGLWindow and QOpenGLWidget.
+    However, QVulkanWindow utilizes a separate QVulkanWindowRenderer object.
+    This resembles QQuickFramebufferObject, and allows better separation of the
+    functions that are supposed to be reimplemented.
+
+    \snippet hellovulkanwindow/hellovulkanwindow.h 0
+
+    The QVulkanWindow subclass reimplements the factory function
+    QVulkanWindow::createRenderer(). This simply returns a new instance of the
+    QVulkanWindowRenderer subclass. In order to be able to access various
+    Vulkan resources via the window object, a pointer to the window is passed
+    and stored via the constructor.
+
+    \snippet hellovulkanwindow/hellovulkanwindow.cpp 0
+
+    Graphics resource creation and destruction is typically done in one of the
+    init - resource functions.
+
+    \snippet hellovulkanwindow/hellovulkanwindow.cpp 1
+
+    \section1 The Actual Rendering
+
+    QVulkanWindow subclasses queue their draw calls in their reimplementation
+    of QVulkanWindowRenderer::startNextFrame(). Once done, they are required to
+    call back QVulkanWindow::frameReady(). The example has no asynchronous
+    command generation, so the frameReady() call is made directly from
+    startNextFrame().
+
+    \snippet hellovulkanwindow/hellovulkanwindow.cpp 2
+
+    To get continuous updates, the example simply invokes
+    QWindow::requestUpdate() in order to schedule a repaint.
+
+    \include examples-run.qdocinc
+*/

examples/vulkan/hellovulkantexture/hellovulkantexture.cpp

@@ -0,0 +1,828 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "hellovulkantexture.h"
+#include <QVulkanFunctions>
+#include <QCoreApplication>
+#include <QFile>
+
+// Use a triangle strip to get a quad.
+//
+// Note that the vertex data and the projection matrix assume OpenGL. With
+// Vulkan Y is negated in clip space and the near/far plane is at 0/1 instead
+// of -1/1. These will be corrected for by an extra transformation when
+// calculating the modelview-projection matrix.
+static float vertexData[] = {
+    // x, y, z, u, v
+    -1, -1, 0, 0, 1,
+    -1,  1, 0, 0, 0,
+     1, -1, 0, 1, 1,
+     1,  1, 0, 1, 0
+};
+
+static const int UNIFORM_DATA_SIZE = 16 * sizeof(float);
+
+static inline VkDeviceSize aligned(VkDeviceSize v, VkDeviceSize byteAlign)
+{
+    return (v + byteAlign - 1) & ~(byteAlign - 1);
+}
+
+QVulkanWindowRenderer *VulkanWindow::createRenderer()
+{
+    return new VulkanRenderer(this);
+}
+
+VulkanRenderer::VulkanRenderer(QVulkanWindow *w)
+    : m_window(w)
+{
+}
+
+VkShaderModule VulkanRenderer::createShader(const QString &name)
+{
+    QFile file(name);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning("Failed to read shader %s", qPrintable(name));
+        return VK_NULL_HANDLE;
+    }
+    QByteArray blob = file.readAll();
+    file.close();
+
+    VkShaderModuleCreateInfo shaderInfo;
+    memset(&shaderInfo, 0, sizeof(shaderInfo));
+    shaderInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
+    shaderInfo.codeSize = blob.size();
+    shaderInfo.pCode = reinterpret_cast<const uint32_t *>(blob.constData());
+    VkShaderModule shaderModule;
+    VkResult err = m_devFuncs->vkCreateShaderModule(m_window->device(), &shaderInfo, nullptr, &shaderModule);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to create shader module: %d", err);
+        return VK_NULL_HANDLE;
+    }
+
+    return shaderModule;
+}
+
+bool VulkanRenderer::createTexture(const QString &name)
+{
+    QImage img(name);
+    if (img.isNull()) {
+        qWarning("Failed to load image %s", qPrintable(name));
+        return false;
+    }
+
+    // Convert to byte ordered RGBA8. Use premultiplied alpha, see pColorBlendState in the pipeline.
+    img = img.convertToFormat(QImage::Format_RGBA8888_Premultiplied);
+
+    QVulkanFunctions *f = m_window->vulkanInstance()->functions();
+    VkDevice dev = m_window->device();
+
+    const bool srgb = QCoreApplication::arguments().contains(QStringLiteral("--srgb"));
+    if (srgb)
+        qDebug("sRGB swapchain was requested, making texture sRGB too");
+
+    m_texFormat = srgb ? VK_FORMAT_R8G8B8A8_SRGB : VK_FORMAT_R8G8B8A8_UNORM;
+
+    // Now we can either map and copy the image data directly, or have to go
+    // through a staging buffer to copy and convert into the internal optimal
+    // tiling format.
+    VkFormatProperties props;
+    f->vkGetPhysicalDeviceFormatProperties(m_window->physicalDevice(), m_texFormat, &props);
+    const bool canSampleLinear = (props.linearTilingFeatures & VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT);
+    const bool canSampleOptimal = (props.optimalTilingFeatures & VK_FORMAT_FEATURE_SAMPLED_IMAGE_BIT);
+    if (!canSampleLinear && !canSampleOptimal) {
+        qWarning("Neither linear nor optimal image sampling is supported for RGBA8");
+        return false;
+    }
+
+    static bool alwaysStage = qEnvironmentVariableIntValue("QT_VK_FORCE_STAGE_TEX");
+
+    if (canSampleLinear && !alwaysStage) {
+        if (!createTextureImage(img.size(), &m_texImage, &m_texMem,
+                                VK_IMAGE_TILING_LINEAR, VK_IMAGE_USAGE_SAMPLED_BIT,
+                                m_window->hostVisibleMemoryIndex()))
+            return false;
+
+        if (!writeLinearImage(img, m_texImage, m_texMem))
+            return false;
+
+        m_texLayoutPending = true;
+    } else {
+        if (!createTextureImage(img.size(), &m_texStaging, &m_texStagingMem,
+                                VK_IMAGE_TILING_LINEAR, VK_IMAGE_USAGE_TRANSFER_SRC_BIT,
+                                m_window->hostVisibleMemoryIndex()))
+            return false;
+
+        if (!createTextureImage(img.size(), &m_texImage, &m_texMem,
+                                VK_IMAGE_TILING_OPTIMAL, VK_IMAGE_USAGE_TRANSFER_DST_BIT | VK_IMAGE_USAGE_SAMPLED_BIT,
+                                m_window->deviceLocalMemoryIndex()))
+            return false;
+
+        if (!writeLinearImage(img, m_texStaging, m_texStagingMem))
+            return false;
+
+        m_texStagingPending = true;
+    }
+
+    VkImageViewCreateInfo viewInfo;
+    memset(&viewInfo, 0, sizeof(viewInfo));
+    viewInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
+    viewInfo.image = m_texImage;
+    viewInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
+    viewInfo.format = m_texFormat;
+    viewInfo.components.r = VK_COMPONENT_SWIZZLE_R;
+    viewInfo.components.g = VK_COMPONENT_SWIZZLE_G;
+    viewInfo.components.b = VK_COMPONENT_SWIZZLE_B;
+    viewInfo.components.a = VK_COMPONENT_SWIZZLE_A;
+    viewInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+    viewInfo.subresourceRange.levelCount = viewInfo.subresourceRange.layerCount = 1;
+
+    VkResult err = m_devFuncs->vkCreateImageView(dev, &viewInfo, nullptr, &m_texView);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to create image view for texture: %d", err);
+        return false;
+    }
+
+    m_texSize = img.size();
+
+    return true;
+}
+
+bool VulkanRenderer::createTextureImage(const QSize &size, VkImage *image, VkDeviceMemory *mem,
+                                        VkImageTiling tiling, VkImageUsageFlags usage, uint32_t memIndex)
+{
+    VkDevice dev = m_window->device();
+
+    VkImageCreateInfo imageInfo;
+    memset(&imageInfo, 0, sizeof(imageInfo));
+    imageInfo.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
+    imageInfo.imageType = VK_IMAGE_TYPE_2D;
+    imageInfo.format = m_texFormat;
+    imageInfo.extent.width = size.width();
+    imageInfo.extent.height = size.height();
+    imageInfo.extent.depth = 1;
+    imageInfo.mipLevels = 1;
+    imageInfo.arrayLayers = 1;
+    imageInfo.samples = VK_SAMPLE_COUNT_1_BIT;
+    imageInfo.tiling = tiling;
+    imageInfo.usage = usage;
+    imageInfo.initialLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
+
+    VkResult err = m_devFuncs->vkCreateImage(dev, &imageInfo, nullptr, image);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to create linear image for texture: %d", err);
+        return false;
+    }
+
+    VkMemoryRequirements memReq;
+    m_devFuncs->vkGetImageMemoryRequirements(dev, *image, &memReq);
+
+    VkMemoryAllocateInfo allocInfo = {
+        VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+        nullptr,
+        memReq.size,
+        memIndex
+    };
+    qDebug("allocating %u bytes for texture image", uint32_t(memReq.size));
+
+    err = m_devFuncs->vkAllocateMemory(dev, &allocInfo, nullptr, mem);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to allocate memory for linear image: %d", err);
+        return false;
+    }
+
+    err = m_devFuncs->vkBindImageMemory(dev, *image, *mem, 0);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to bind linear image memory: %d", err);
+        return false;
+    }
+
+    return true;
+}
+
+bool VulkanRenderer::writeLinearImage(const QImage &img, VkImage image, VkDeviceMemory memory)
+{
+    VkDevice dev = m_window->device();
+
+    VkImageSubresource subres = {
+        VK_IMAGE_ASPECT_COLOR_BIT,
+        0, // mip level
+        0
+    };
+    VkSubresourceLayout layout;
+    m_devFuncs->vkGetImageSubresourceLayout(dev, image, &subres, &layout);
+
+    uchar *p;
+    VkResult err = m_devFuncs->vkMapMemory(dev, memory, layout.offset, layout.size, 0, reinterpret_cast<void **>(&p));
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to map memory for linear image: %d", err);
+        return false;
+    }
+
+    for (int y = 0; y < img.height(); ++y) {
+        const uchar *line = img.constScanLine(y);
+        memcpy(p, line, img.width() * 4);
+        p += layout.rowPitch;
+    }
+
+    m_devFuncs->vkUnmapMemory(dev, memory);
+    return true;
+}
+
+void VulkanRenderer::ensureTexture()
+{
+    if (!m_texLayoutPending && !m_texStagingPending)
+        return;
+
+    Q_ASSERT(m_texLayoutPending != m_texStagingPending);
+    VkCommandBuffer cb = m_window->currentCommandBuffer();
+
+    VkImageMemoryBarrier barrier;
+    memset(&barrier, 0, sizeof(barrier));
+    barrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
+    barrier.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+    barrier.subresourceRange.levelCount = barrier.subresourceRange.layerCount = 1;
+
+    if (m_texLayoutPending) {
+        m_texLayoutPending = false;
+
+        barrier.oldLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
+        barrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+        barrier.srcAccessMask = VK_ACCESS_HOST_WRITE_BIT;
+        barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
+        barrier.image = m_texImage;
+
+        m_devFuncs->vkCmdPipelineBarrier(cb,
+                                VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+                                VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
+                                0, 0, nullptr, 0, nullptr,
+                                1, &barrier);
+    } else {
+        m_texStagingPending = false;
+
+        barrier.oldLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
+        barrier.newLayout = VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL;
+        barrier.srcAccessMask = VK_ACCESS_HOST_WRITE_BIT;
+        barrier.dstAccessMask = VK_ACCESS_TRANSFER_READ_BIT;
+        barrier.image = m_texStaging;
+        m_devFuncs->vkCmdPipelineBarrier(cb,
+                                VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+                                VK_PIPELINE_STAGE_TRANSFER_BIT,
+                                0, 0, nullptr, 0, nullptr,
+                                1, &barrier);
+
+        barrier.oldLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
+        barrier.newLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
+        barrier.srcAccessMask = 0;
+        barrier.dstAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
+        barrier.image = m_texImage;
+        m_devFuncs->vkCmdPipelineBarrier(cb,
+                                VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+                                VK_PIPELINE_STAGE_TRANSFER_BIT,
+                                0, 0, nullptr, 0, nullptr,
+                                1, &barrier);
+
+        VkImageCopy copyInfo;
+        memset(&copyInfo, 0, sizeof(copyInfo));
+        copyInfo.srcSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+        copyInfo.srcSubresource.layerCount = 1;
+        copyInfo.dstSubresource.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
+        copyInfo.dstSubresource.layerCount = 1;
+        copyInfo.extent.width = m_texSize.width();
+        copyInfo.extent.height = m_texSize.height();
+        copyInfo.extent.depth = 1;
+        m_devFuncs->vkCmdCopyImage(cb, m_texStaging, VK_IMAGE_LAYOUT_TRANSFER_SRC_OPTIMAL,
+                          m_texImage, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &copyInfo);
+
+        barrier.oldLayout = VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL;
+        barrier.newLayout = VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL;
+        barrier.srcAccessMask = VK_ACCESS_TRANSFER_WRITE_BIT;
+        barrier.dstAccessMask = VK_ACCESS_SHADER_READ_BIT;
+        barrier.image = m_texImage;
+        m_devFuncs->vkCmdPipelineBarrier(cb,
+                                VK_PIPELINE_STAGE_TRANSFER_BIT,
+                                VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT,
+                                0, 0, nullptr, 0, nullptr,
+                                1, &barrier);
+    }
+}
+
+void VulkanRenderer::initResources()
+{
+    qDebug("initResources");
+
+    VkDevice dev = m_window->device();
+    m_devFuncs = m_window->vulkanInstance()->deviceFunctions(dev);
+
+    // The setup is similar to hellovulkantriangle. The difference is the
+    // presence of a second vertex attribute (texcoord), a sampler, and that we
+    // need blending.
+
+    const int concurrentFrameCount = m_window->concurrentFrameCount();
+    const VkPhysicalDeviceLimits *pdevLimits = &m_window->physicalDeviceProperties()->limits;
+    const VkDeviceSize uniAlign = pdevLimits->minUniformBufferOffsetAlignment;
+    qDebug("uniform buffer offset alignment is %u", (uint) uniAlign);
+    VkBufferCreateInfo bufInfo;
+    memset(&bufInfo, 0, sizeof(bufInfo));
+    bufInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
+    // Our internal layout is vertex, uniform, uniform, ... with each uniform buffer start offset aligned to uniAlign.
+    const VkDeviceSize vertexAllocSize = aligned(sizeof(vertexData), uniAlign);
+    const VkDeviceSize uniformAllocSize = aligned(UNIFORM_DATA_SIZE, uniAlign);
+    bufInfo.size = vertexAllocSize + concurrentFrameCount * uniformAllocSize;
+    bufInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT;
+
+    VkResult err = m_devFuncs->vkCreateBuffer(dev, &bufInfo, nullptr, &m_buf);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create buffer: %d", err);
+
+    VkMemoryRequirements memReq;
+    m_devFuncs->vkGetBufferMemoryRequirements(dev, m_buf, &memReq);
+
+    VkMemoryAllocateInfo memAllocInfo = {
+        VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+        nullptr,
+        memReq.size,
+        m_window->hostVisibleMemoryIndex()
+    };
+
+    err = m_devFuncs->vkAllocateMemory(dev, &memAllocInfo, nullptr, &m_bufMem);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to allocate memory: %d", err);
+
+    err = m_devFuncs->vkBindBufferMemory(dev, m_buf, m_bufMem, 0);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to bind buffer memory: %d", err);
+
+    quint8 *p;
+    err = m_devFuncs->vkMapMemory(dev, m_bufMem, 0, memReq.size, 0, reinterpret_cast<void **>(&p));
+    if (err != VK_SUCCESS)
+        qFatal("Failed to map memory: %d", err);
+    memcpy(p, vertexData, sizeof(vertexData));
+    QMatrix4x4 ident;
+    memset(m_uniformBufInfo, 0, sizeof(m_uniformBufInfo));
+    for (int i = 0; i < concurrentFrameCount; ++i) {
+        const VkDeviceSize offset = vertexAllocSize + i * uniformAllocSize;
+        memcpy(p + offset, ident.constData(), 16 * sizeof(float));
+        m_uniformBufInfo[i].buffer = m_buf;
+        m_uniformBufInfo[i].offset = offset;
+        m_uniformBufInfo[i].range = uniformAllocSize;
+    }
+    m_devFuncs->vkUnmapMemory(dev, m_bufMem);
+
+    VkVertexInputBindingDescription vertexBindingDesc = {
+        0, // binding
+        5 * sizeof(float),
+        VK_VERTEX_INPUT_RATE_VERTEX
+    };
+    VkVertexInputAttributeDescription vertexAttrDesc[] = {
+        { // position
+            0, // location
+            0, // binding
+            VK_FORMAT_R32G32B32_SFLOAT,
+            0
+        },
+        { // texcoord
+            1,
+            0,
+            VK_FORMAT_R32G32_SFLOAT,
+            3 * sizeof(float)
+        }
+    };
+
+    VkPipelineVertexInputStateCreateInfo vertexInputInfo;
+    vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
+    vertexInputInfo.pNext = nullptr;
+    vertexInputInfo.flags = 0;
+    vertexInputInfo.vertexBindingDescriptionCount = 1;
+    vertexInputInfo.pVertexBindingDescriptions = &vertexBindingDesc;
+    vertexInputInfo.vertexAttributeDescriptionCount = 2;
+    vertexInputInfo.pVertexAttributeDescriptions = vertexAttrDesc;
+
+    // Sampler.
+    VkSamplerCreateInfo samplerInfo;
+    memset(&samplerInfo, 0, sizeof(samplerInfo));
+    samplerInfo.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
+    samplerInfo.magFilter = VK_FILTER_NEAREST;
+    samplerInfo.minFilter = VK_FILTER_NEAREST;
+    samplerInfo.addressModeU = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    samplerInfo.addressModeV = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    samplerInfo.addressModeW = VK_SAMPLER_ADDRESS_MODE_CLAMP_TO_EDGE;
+    err = m_devFuncs->vkCreateSampler(dev, &samplerInfo, nullptr, &m_sampler);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create sampler: %d", err);
+
+    // Texture.
+    if (!createTexture(QStringLiteral(":/qt256.png")))
+        qFatal("Failed to create texture");
+
+    // Set up descriptor set and its layout.
+    VkDescriptorPoolSize descPoolSizes[2] = {
+        { VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, uint32_t(concurrentFrameCount) },
+        { VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER, uint32_t(concurrentFrameCount) }
+    };
+    VkDescriptorPoolCreateInfo descPoolInfo;
+    memset(&descPoolInfo, 0, sizeof(descPoolInfo));
+    descPoolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+    descPoolInfo.maxSets = concurrentFrameCount;
+    descPoolInfo.poolSizeCount = 2;
+    descPoolInfo.pPoolSizes = descPoolSizes;
+    err = m_devFuncs->vkCreateDescriptorPool(dev, &descPoolInfo, nullptr, &m_descPool);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create descriptor pool: %d", err);
+
+    VkDescriptorSetLayoutBinding layoutBinding[2] =
+    {
+        {
+            0, // binding
+            VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+            1, // descriptorCount
+            VK_SHADER_STAGE_VERTEX_BIT,
+            nullptr
+        },
+        {
+            1, // binding
+            VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER,
+            1, // descriptorCount
+            VK_SHADER_STAGE_FRAGMENT_BIT,
+            nullptr
+        }
+    };
+    VkDescriptorSetLayoutCreateInfo descLayoutInfo = {
+        VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
+        nullptr,
+        0,
+        2, // bindingCount
+        layoutBinding
+    };
+    err = m_devFuncs->vkCreateDescriptorSetLayout(dev, &descLayoutInfo, nullptr, &m_descSetLayout);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create descriptor set layout: %d", err);
+
+    for (int i = 0; i < concurrentFrameCount; ++i) {
+        VkDescriptorSetAllocateInfo descSetAllocInfo = {
+            VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
+            nullptr,
+            m_descPool,
+            1,
+            &m_descSetLayout
+        };
+        err = m_devFuncs->vkAllocateDescriptorSets(dev, &descSetAllocInfo, &m_descSet[i]);
+        if (err != VK_SUCCESS)
+            qFatal("Failed to allocate descriptor set: %d", err);
+
+        VkWriteDescriptorSet descWrite[2];
+        memset(descWrite, 0, sizeof(descWrite));
+        descWrite[0].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+        descWrite[0].dstSet = m_descSet[i];
+        descWrite[0].dstBinding = 0;
+        descWrite[0].descriptorCount = 1;
+        descWrite[0].descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+        descWrite[0].pBufferInfo = &m_uniformBufInfo[i];
+
+        VkDescriptorImageInfo descImageInfo = {
+            m_sampler,
+            m_texView,
+            VK_IMAGE_LAYOUT_GENERAL
+        };
+
+        descWrite[1].sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+        descWrite[1].dstSet = m_descSet[i];
+        descWrite[1].dstBinding = 1;
+        descWrite[1].descriptorCount = 1;
+        descWrite[1].descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
+        descWrite[1].pImageInfo = &descImageInfo;
+
+        m_devFuncs->vkUpdateDescriptorSets(dev, 2, descWrite, 0, nullptr);
+    }
+
+    // Pipeline cache
+    VkPipelineCacheCreateInfo pipelineCacheInfo;
+    memset(&pipelineCacheInfo, 0, sizeof(pipelineCacheInfo));
+    pipelineCacheInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_CACHE_CREATE_INFO;
+    err = m_devFuncs->vkCreatePipelineCache(dev, &pipelineCacheInfo, nullptr, &m_pipelineCache);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create pipeline cache: %d", err);
+
+    // Pipeline layout
+    VkPipelineLayoutCreateInfo pipelineLayoutInfo;
+    memset(&pipelineLayoutInfo, 0, sizeof(pipelineLayoutInfo));
+    pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
+    pipelineLayoutInfo.setLayoutCount = 1;
+    pipelineLayoutInfo.pSetLayouts = &m_descSetLayout;
+    err = m_devFuncs->vkCreatePipelineLayout(dev, &pipelineLayoutInfo, nullptr, &m_pipelineLayout);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create pipeline layout: %d", err);
+
+    // Shaders
+    VkShaderModule vertShaderModule = createShader(QStringLiteral(":/texture_vert.spv"));
+    VkShaderModule fragShaderModule = createShader(QStringLiteral(":/texture_frag.spv"));
+
+    // Graphics pipeline
+    VkGraphicsPipelineCreateInfo pipelineInfo;
+    memset(&pipelineInfo, 0, sizeof(pipelineInfo));
+    pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
+
+    VkPipelineShaderStageCreateInfo shaderStages[2] = {
+        {
+            VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            nullptr,
+            0,
+            VK_SHADER_STAGE_VERTEX_BIT,
+            vertShaderModule,
+            "main",
+            nullptr
+        },
+        {
+            VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            nullptr,
+            0,
+            VK_SHADER_STAGE_FRAGMENT_BIT,
+            fragShaderModule,
+            "main",
+            nullptr
+        }
+    };
+    pipelineInfo.stageCount = 2;
+    pipelineInfo.pStages = shaderStages;
+
+    pipelineInfo.pVertexInputState = &vertexInputInfo;
+
+    VkPipelineInputAssemblyStateCreateInfo ia;
+    memset(&ia, 0, sizeof(ia));
+    ia.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
+    ia.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_STRIP;
+    pipelineInfo.pInputAssemblyState = &ia;
+
+    // The viewport and scissor will be set dynamically via vkCmdSetViewport/Scissor.
+    // This way the pipeline does not need to be touched when resizing the window.
+    VkPipelineViewportStateCreateInfo vp;
+    memset(&vp, 0, sizeof(vp));
+    vp.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
+    vp.viewportCount = 1;
+    vp.scissorCount = 1;
+    pipelineInfo.pViewportState = &vp;
+
+    VkPipelineRasterizationStateCreateInfo rs;
+    memset(&rs, 0, sizeof(rs));
+    rs.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
+    rs.polygonMode = VK_POLYGON_MODE_FILL;
+    rs.cullMode = VK_CULL_MODE_NONE; // we want the back face as well
+    rs.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
+    rs.lineWidth = 1.0f;
+    pipelineInfo.pRasterizationState = &rs;
+
+    VkPipelineMultisampleStateCreateInfo ms;
+    memset(&ms, 0, sizeof(ms));
+    ms.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
+    ms.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
+    pipelineInfo.pMultisampleState = &ms;
+
+    VkPipelineDepthStencilStateCreateInfo ds;
+    memset(&ds, 0, sizeof(ds));
+    ds.sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
+    ds.depthTestEnable = VK_TRUE;
+    ds.depthWriteEnable = VK_TRUE;
+    ds.depthCompareOp = VK_COMPARE_OP_LESS_OR_EQUAL;
+    pipelineInfo.pDepthStencilState = &ds;
+
+    VkPipelineColorBlendStateCreateInfo cb;
+    memset(&cb, 0, sizeof(cb));
+    cb.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
+    // assume pre-multiplied alpha, blend, write out all of rgba
+    VkPipelineColorBlendAttachmentState att;
+    memset(&att, 0, sizeof(att));
+    att.colorWriteMask = 0xF;
+    att.blendEnable = VK_TRUE;
+    att.srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+    att.dstColorBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
+    att.colorBlendOp = VK_BLEND_OP_ADD;
+    att.srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE;
+    att.dstAlphaBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_ALPHA;
+    att.alphaBlendOp = VK_BLEND_OP_ADD;
+    cb.attachmentCount = 1;
+    cb.pAttachments = &att;
+    pipelineInfo.pColorBlendState = &cb;
+
+    VkDynamicState dynEnable[] = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
+    VkPipelineDynamicStateCreateInfo dyn;
+    memset(&dyn, 0, sizeof(dyn));
+    dyn.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
+    dyn.dynamicStateCount = sizeof(dynEnable) / sizeof(VkDynamicState);
+    dyn.pDynamicStates = dynEnable;
+    pipelineInfo.pDynamicState = &dyn;
+
+    pipelineInfo.layout = m_pipelineLayout;
+    pipelineInfo.renderPass = m_window->defaultRenderPass();
+
+    err = m_devFuncs->vkCreateGraphicsPipelines(dev, m_pipelineCache, 1, &pipelineInfo, nullptr, &m_pipeline);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create graphics pipeline: %d", err);
+
+    if (vertShaderModule)
+        m_devFuncs->vkDestroyShaderModule(dev, vertShaderModule, nullptr);
+    if (fragShaderModule)
+        m_devFuncs->vkDestroyShaderModule(dev, fragShaderModule, nullptr);
+}
+
+void VulkanRenderer::initSwapChainResources()
+{
+    qDebug("initSwapChainResources");
+
+    // Projection matrix
+    m_proj = *m_window->clipCorrectionMatrix(); // adjust for Vulkan-OpenGL clip space differences
+    const QSize sz = m_window->swapChainImageSize();
+    m_proj.perspective(45.0f, sz.width() / (float) sz.height(), 0.01f, 100.0f);
+    m_proj.translate(0, 0, -4);
+}
+
+void VulkanRenderer::releaseSwapChainResources()
+{
+    qDebug("releaseSwapChainResources");
+}
+
+void VulkanRenderer::releaseResources()
+{
+    qDebug("releaseResources");
+
+    VkDevice dev = m_window->device();
+
+    if (m_sampler) {
+        m_devFuncs->vkDestroySampler(dev, m_sampler, nullptr);
+        m_sampler = VK_NULL_HANDLE;
+    }
+
+    if (m_texStaging) {
+        m_devFuncs->vkDestroyImage(dev, m_texStaging, nullptr);
+        m_texStaging = VK_NULL_HANDLE;
+    }
+
+    if (m_texStagingMem) {
+        m_devFuncs->vkFreeMemory(dev, m_texStagingMem, nullptr);
+        m_texStagingMem = VK_NULL_HANDLE;
+    }
+
+    if (m_texView) {
+        m_devFuncs->vkDestroyImageView(dev, m_texView, nullptr);
+        m_texView = VK_NULL_HANDLE;
+    }
+
+    if (m_texImage) {
+        m_devFuncs->vkDestroyImage(dev, m_texImage, nullptr);
+        m_texImage = VK_NULL_HANDLE;
+    }
+
+    if (m_texMem) {
+        m_devFuncs->vkFreeMemory(dev, m_texMem, nullptr);
+        m_texMem = VK_NULL_HANDLE;
+    }
+
+    if (m_pipeline) {
+        m_devFuncs->vkDestroyPipeline(dev, m_pipeline, nullptr);
+        m_pipeline = VK_NULL_HANDLE;
+    }
+
+    if (m_pipelineLayout) {
+        m_devFuncs->vkDestroyPipelineLayout(dev, m_pipelineLayout, nullptr);
+        m_pipelineLayout = VK_NULL_HANDLE;
+    }
+
+    if (m_pipelineCache) {
+        m_devFuncs->vkDestroyPipelineCache(dev, m_pipelineCache, nullptr);
+        m_pipelineCache = VK_NULL_HANDLE;
+    }
+
+    if (m_descSetLayout) {
+        m_devFuncs->vkDestroyDescriptorSetLayout(dev, m_descSetLayout, nullptr);
+        m_descSetLayout = VK_NULL_HANDLE;
+    }
+
+    if (m_descPool) {
+        m_devFuncs->vkDestroyDescriptorPool(dev, m_descPool, nullptr);
+        m_descPool = VK_NULL_HANDLE;
+    }
+
+    if (m_buf) {
+        m_devFuncs->vkDestroyBuffer(dev, m_buf, nullptr);
+        m_buf = VK_NULL_HANDLE;
+    }
+
+    if (m_bufMem) {
+        m_devFuncs->vkFreeMemory(dev, m_bufMem, nullptr);
+        m_bufMem = VK_NULL_HANDLE;
+    }
+}
+
+void VulkanRenderer::startNextFrame()
+{
+    VkDevice dev = m_window->device();
+    VkCommandBuffer cb = m_window->currentCommandBuffer();
+    const QSize sz = m_window->swapChainImageSize();
+
+    // Add the necessary barriers and do the host-linear -> device-optimal copy, if not yet done.
+    ensureTexture();
+
+    VkClearColorValue clearColor = { 0, 0, 0, 1 };
+    VkClearDepthStencilValue clearDS = { 1, 0 };
+    VkClearValue clearValues[2];
+    memset(clearValues, 0, sizeof(clearValues));
+    clearValues[0].color = clearColor;
+    clearValues[1].depthStencil = clearDS;
+
+    VkRenderPassBeginInfo rpBeginInfo;
+    memset(&rpBeginInfo, 0, sizeof(rpBeginInfo));
+    rpBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+    rpBeginInfo.renderPass = m_window->defaultRenderPass();
+    rpBeginInfo.framebuffer = m_window->currentFramebuffer();
+    rpBeginInfo.renderArea.extent.width = sz.width();
+    rpBeginInfo.renderArea.extent.height = sz.height();
+    rpBeginInfo.clearValueCount = 2;
+    rpBeginInfo.pClearValues = clearValues;
+    VkCommandBuffer cmdBuf = m_window->currentCommandBuffer();
+    m_devFuncs->vkCmdBeginRenderPass(cmdBuf, &rpBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+    quint8 *p;
+    VkResult err = m_devFuncs->vkMapMemory(dev, m_bufMem, m_uniformBufInfo[m_window->currentFrame()].offset,
+            UNIFORM_DATA_SIZE, 0, reinterpret_cast<void **>(&p));
+    if (err != VK_SUCCESS)
+        qFatal("Failed to map memory: %d", err);
+    QMatrix4x4 m = m_proj;
+    m.rotate(m_rotation, 0, 0, 1);
+    memcpy(p, m.constData(), 16 * sizeof(float));
+    m_devFuncs->vkUnmapMemory(dev, m_bufMem);
+
+    // Not exactly a real animation system, just advance on every frame for now.
+    m_rotation += 1.0f;
+
+    m_devFuncs->vkCmdBindPipeline(cb, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipeline);
+    m_devFuncs->vkCmdBindDescriptorSets(cb, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipelineLayout, 0, 1,
+                               &m_descSet[m_window->currentFrame()], 0, nullptr);
+    VkDeviceSize vbOffset = 0;
+    m_devFuncs->vkCmdBindVertexBuffers(cb, 0, 1, &m_buf, &vbOffset);
+
+    VkViewport viewport;
+    viewport.x = viewport.y = 0;
+    viewport.width = sz.width();
+    viewport.height = sz.height();
+    viewport.minDepth = 0;
+    viewport.maxDepth = 1;
+    m_devFuncs->vkCmdSetViewport(cb, 0, 1, &viewport);
+
+    VkRect2D scissor;
+    scissor.offset.x = scissor.offset.y = 0;
+    scissor.extent.width = viewport.width;
+    scissor.extent.height = viewport.height;
+    m_devFuncs->vkCmdSetScissor(cb, 0, 1, &scissor);
+
+    m_devFuncs->vkCmdDraw(cb, 4, 1, 0, 0);
+
+    m_devFuncs->vkCmdEndRenderPass(cmdBuf);
+
+    m_window->frameReady();
+    m_window->requestUpdate(); // render continuously, throttled by the presentation rate
+}

examples/vulkan/hellovulkantexture/hellovulkantexture.h

@@ -0,0 +1,108 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QVulkanWindow>
+#include <QImage>
+
+class VulkanRenderer : public QVulkanWindowRenderer
+{
+public:
+    VulkanRenderer(QVulkanWindow *w);
+
+    void initResources() override;
+    void initSwapChainResources() override;
+    void releaseSwapChainResources() override;
+    void releaseResources() override;
+
+    void startNextFrame() override;
+
+private:
+    VkShaderModule createShader(const QString &name);
+    bool createTexture(const QString &name);
+    bool createTextureImage(const QSize &size, VkImage *image, VkDeviceMemory *mem,
+                            VkImageTiling tiling, VkImageUsageFlags usage, uint32_t memIndex);
+    bool writeLinearImage(const QImage &img, VkImage image, VkDeviceMemory memory);
+    void ensureTexture();
+
+    QVulkanWindow *m_window;
+    QVulkanDeviceFunctions *m_devFuncs;
+
+    VkDeviceMemory m_bufMem = VK_NULL_HANDLE;
+    VkBuffer m_buf = VK_NULL_HANDLE;
+    VkDescriptorBufferInfo m_uniformBufInfo[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkDescriptorPool m_descPool = VK_NULL_HANDLE;
+    VkDescriptorSetLayout m_descSetLayout = VK_NULL_HANDLE;
+    VkDescriptorSet m_descSet[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkPipelineCache m_pipelineCache = VK_NULL_HANDLE;
+    VkPipelineLayout m_pipelineLayout = VK_NULL_HANDLE;
+    VkPipeline m_pipeline = VK_NULL_HANDLE;
+
+    VkSampler m_sampler = VK_NULL_HANDLE;
+    VkImage m_texImage = VK_NULL_HANDLE;
+    VkDeviceMemory m_texMem = VK_NULL_HANDLE;
+    bool m_texLayoutPending = false;
+    VkImageView m_texView = VK_NULL_HANDLE;
+    VkImage m_texStaging = VK_NULL_HANDLE;
+    VkDeviceMemory m_texStagingMem = VK_NULL_HANDLE;
+    bool m_texStagingPending = false;
+    QSize m_texSize;
+    VkFormat m_texFormat;
+
+    QMatrix4x4 m_proj;
+    float m_rotation = 0.0f;
+};
+
+class VulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+};

examples/vulkan/hellovulkantexture/hellovulkantexture.pro

@@ -0,0 +1,7 @@
+HEADERS += hellovulkantexture.h
+SOURCES += hellovulkantexture.cpp main.cpp
+RESOURCES += hellovulkantexture.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/vulkan/hellovulkantexture
+INSTALLS += target

examples/vulkan/hellovulkantexture/hellovulkantexture.qrc

@@ -0,0 +1,7 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file>texture_vert.spv</file>
+    <file>texture_frag.spv</file>
+    <file>qt256.png</file>
+</qresource>
+</RCC>

examples/vulkan/hellovulkantexture/main.cpp

@@ -0,0 +1,91 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <QVulkanInstance>
+#include <QLoggingCategory>
+#include "hellovulkantexture.h"
+
+Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    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 w;
+    w.setVulkanInstance(&inst);
+    if (QCoreApplication::arguments().contains(QStringLiteral("--srgb")))
+        w.setPreferredColorFormats(QVector<VkFormat>() << VK_FORMAT_B8G8R8A8_SRGB);
+
+    w.resize(1024, 768);
+    w.show();
+
+    return app.exec();
+}

examples/vulkan/hellovulkantexture/texture.frag

@@ -0,0 +1,12 @@
+#version 440
+
+layout(location = 0) in vec2 v_texcoord;
+
+layout(location = 0) out vec4 fragColor;
+
+layout(binding = 1) uniform sampler2D tex;
+
+void main()
+{
+    fragColor = texture(tex, v_texcoord);
+}

examples/vulkan/hellovulkantexture/texture.vert

@@ -0,0 +1,18 @@
+#version 440
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec2 texcoord;
+
+layout(location = 0) out vec2 v_texcoord;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 mvp;
+} ubuf;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+void main()
+{
+    v_texcoord = texcoord;
+    gl_Position = ubuf.mvp * position;
+}

examples/vulkan/hellovulkantriangle/hellovulkantriangle.pro

@@ -0,0 +1,12 @@
+HEADERS += \
+    ../shared/trianglerenderer.h
+
+SOURCES += \
+    main.cpp \
+    ../shared/trianglerenderer.cpp
+
+RESOURCES += hellovulkantriangle.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/vulkan/hellovulkantriangle
+INSTALLS += target

examples/vulkan/hellovulkantriangle/hellovulkantriangle.qrc

@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="color_vert.spv">../shared/color_vert.spv</file>
+    <file alias="color_frag.spv">../shared/color_frag.spv</file>
+</qresource>
+</RCC>

examples/vulkan/hellovulkantriangle/main.cpp

@@ -0,0 +1,100 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <QVulkanInstance>
+#include <QLoggingCategory>
+#include "../shared/trianglerenderer.h"
+
+Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
+
+class VulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+};
+
+QVulkanWindowRenderer *VulkanWindow::createRenderer()
+{
+    return new TriangleRenderer(this, true); // try MSAA, when available
+}
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    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 w;
+    w.setVulkanInstance(&inst);
+
+    w.resize(1024, 768);
+    w.show();
+
+    return app.exec();
+}

examples/vulkan/hellovulkanwidget/hellovulkanwidget.cpp

@@ -0,0 +1,182 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "hellovulkanwidget.h"
+#include <QVulkanFunctions>
+#include <QApplication>
+#include <QVBoxLayout>
+#include <QTextEdit>
+#include <QPushButton>
+#include <QLCDNumber>
+#include <QFileDialog>
+#include <QMessageBox>
+
+MainWindow::MainWindow(VulkanWindow *w)
+    : m_window(w)
+{
+    QWidget *wrapper = QWidget::createWindowContainer(w);
+
+    m_info = new QTextEdit;
+    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;
+    layout->addWidget(m_info, 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->setText(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:");
+    QList<int> sampleCounts = m_window->supportedSampleCounts().toList();
+    std::sort(sampleCounts.begin(), sampleCounts.end());
+    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);
+}

examples/vulkan/hellovulkanwidget/hellovulkanwidget.h

@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "../shared/trianglerenderer.h"
+#include <QWidget>
+
+class VulkanWindow;
+
+QT_BEGIN_NAMESPACE
+class QTextEdit;
+class QLCDNumber;
+QT_END_NAMESPACE
+
+class MainWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    MainWindow(VulkanWindow *w);
+
+public slots:
+    void onVulkanInfoReceived(const QString &text);
+    void onFrameQueued(int colorValue);
+    void onGrabRequested();
+
+private:
+    VulkanWindow *m_window;
+    QTextEdit *m_info;
+    QLCDNumber *m_number;
+};
+
+class VulkanRenderer : public TriangleRenderer
+{
+public:
+    VulkanRenderer(VulkanWindow *w);
+
+    void initResources() override;
+    void startNextFrame() override;
+};
+
+class VulkanWindow : public QVulkanWindow
+{
+    Q_OBJECT
+
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+
+signals:
+    void vulkanInfoReceived(const QString &text);
+    void frameQueued(int colorValue);
+};

examples/vulkan/hellovulkanwidget/hellovulkanwidget.pro

@@ -0,0 +1,16 @@
+QT += widgets
+
+HEADERS += \
+    hellovulkanwidget.h \
+    ../shared/trianglerenderer.h
+
+SOURCES += \
+    hellovulkanwidget.cpp \
+    main.cpp \
+    ../shared/trianglerenderer.cpp
+
+RESOURCES += hellovulkanwidget.qrc
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/vulkan/hellovulkanwidget
+INSTALLS += target

examples/vulkan/hellovulkanwidget/hellovulkanwidget.qrc

@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="color_vert.spv">../shared/color_vert.spv</file>
+    <file alias="color_frag.spv">../shared/color_frag.spv</file>
+</qresource>
+</RCC>

examples/vulkan/hellovulkanwidget/main.cpp

@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+#include <QVulkanInstance>
+#include <QLoggingCategory>
+#include "hellovulkanwidget.h"
+
+Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+
+    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);
+    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();
+}

examples/vulkan/hellovulkanwindow/hellovulkanwindow.cpp

@@ -0,0 +1,128 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "hellovulkanwindow.h"
+#include <QVulkanFunctions>
+
+//! [0]
+QVulkanWindowRenderer *VulkanWindow::createRenderer()
+{
+    return new VulkanRenderer(this);
+}
+
+VulkanRenderer::VulkanRenderer(QVulkanWindow *w)
+    : m_window(w)
+{
+}
+//! [0]
+
+//! [1]
+void VulkanRenderer::initResources()
+{
+    qDebug("initResources");
+
+    m_devFuncs = m_window->vulkanInstance()->deviceFunctions(m_window->device());
+}
+//! [1]
+
+void VulkanRenderer::initSwapChainResources()
+{
+    qDebug("initSwapChainResources");
+}
+
+void VulkanRenderer::releaseSwapChainResources()
+{
+    qDebug("releaseSwapChainResources");
+}
+
+void VulkanRenderer::releaseResources()
+{
+    qDebug("releaseResources");
+}
+
+//! [2]
+void VulkanRenderer::startNextFrame()
+{
+    m_green += 0.005f;
+    if (m_green > 1.0f)
+        m_green = 0.0f;
+
+    VkClearColorValue clearColor = { 0.0f, m_green, 0.0f, 1.0f };
+    VkClearDepthStencilValue clearDS = { 1.0f, 0 };
+    VkClearValue clearValues[2];
+    memset(clearValues, 0, sizeof(clearValues));
+    clearValues[0].color = clearColor;
+    clearValues[1].depthStencil = clearDS;
+
+    VkRenderPassBeginInfo rpBeginInfo;
+    memset(&rpBeginInfo, 0, sizeof(rpBeginInfo));
+    rpBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+    rpBeginInfo.renderPass = m_window->defaultRenderPass();
+    rpBeginInfo.framebuffer = m_window->currentFramebuffer();
+    const QSize sz = m_window->swapChainImageSize();
+    rpBeginInfo.renderArea.extent.width = sz.width();
+    rpBeginInfo.renderArea.extent.height = sz.height();
+    rpBeginInfo.clearValueCount = 2;
+    rpBeginInfo.pClearValues = clearValues;
+    VkCommandBuffer cmdBuf = m_window->currentCommandBuffer();
+    m_devFuncs->vkCmdBeginRenderPass(cmdBuf, &rpBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+    // Do nothing else. We will just clear to green, changing the component on
+    // every invocation. This also helps verifying the rate to which the thread
+    // is throttled to. (The elapsed time between startNextFrame calls should
+    // typically be around 16 ms. Note that rendering is 2 frames ahead of what
+    // is displayed.)
+
+    m_devFuncs->vkCmdEndRenderPass(cmdBuf);
+
+    m_window->frameReady();
+    m_window->requestUpdate(); // render continuously, throttled by the presentation rate
+}
+//! [2]

examples/vulkan/hellovulkanwindow/hellovulkanwindow.h

@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QVulkanWindow>
+
+//! [0]
+class VulkanRenderer : public QVulkanWindowRenderer
+{
+public:
+    VulkanRenderer(QVulkanWindow *w);
+
+    void initResources() override;
+    void initSwapChainResources() override;
+    void releaseSwapChainResources() override;
+    void releaseResources() override;
+
+    void startNextFrame() override;
+
+private:
+    QVulkanWindow *m_window;
+    QVulkanDeviceFunctions *m_devFuncs;
+    float m_green = 0;
+};
+
+class VulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+};
+//! [0]

examples/vulkan/hellovulkanwindow/hellovulkanwindow.pro

@@ -0,0 +1,6 @@
+HEADERS += hellovulkanwindow.h
+SOURCES += hellovulkanwindow.cpp main.cpp
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/vulkan/hellovulkanwindow
+INSTALLS += target

examples/vulkan/hellovulkanwindow/main.cpp

@@ -0,0 +1,93 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QGuiApplication>
+#include <QVulkanInstance>
+#include <QLoggingCategory>
+#include "hellovulkanwindow.h"
+
+Q_LOGGING_CATEGORY(lcVk, "qt.vulkan")
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication app(argc, argv);
+
+    QLoggingCategory::setFilterRules(QStringLiteral("qt.vulkan=true"));
+
+//! [0]
+    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());
+//! [0]
+
+//! [1]
+    VulkanWindow w;
+    w.setVulkanInstance(&inst);
+
+    w.resize(1024, 768);
+    w.show();
+//! [1]
+
+    return app.exec();
+}

examples/vulkan/shared/color.frag

@@ -0,0 +1,10 @@
+#version 440
+
+layout(location = 0) in vec3 v_color;
+
+layout(location = 0) out vec4 fragColor;
+
+void main()
+{
+    fragColor = vec4(v_color, 1.0);
+}

examples/vulkan/shared/color.vert

@@ -0,0 +1,18 @@
+#version 440
+
+layout(location = 0) in vec4 position;
+layout(location = 1) in vec3 color;
+
+layout(location = 0) out vec3 v_color;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 mvp;
+} ubuf;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+void main()
+{
+    v_color = color;
+    gl_Position = ubuf.mvp * position;
+}

examples/vulkan/shared/trianglerenderer.cpp

@@ -0,0 +1,513 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "trianglerenderer.h"
+#include <QVulkanFunctions>
+#include <QFile>
+
+// Note that the vertex data and the projection matrix assume OpenGL. With
+// Vulkan Y is negated in clip space and the near/far plane is at 0/1 instead
+// of -1/1. These will be corrected for by an extra transformation when
+// calculating the modelview-projection matrix.
+static float vertexData[] = {
+     0.0f,   0.5f,   1.0f, 0.0f, 0.0f,
+    -0.5f,  -0.5f,   0.0f, 1.0f, 0.0f,
+     0.5f,  -0.5f,   0.0f, 0.0f, 1.0f
+};
+
+static const int UNIFORM_DATA_SIZE = 16 * sizeof(float);
+
+static inline VkDeviceSize aligned(VkDeviceSize v, VkDeviceSize byteAlign)
+{
+    return (v + byteAlign - 1) & ~(byteAlign - 1);
+}
+
+TriangleRenderer::TriangleRenderer(QVulkanWindow *w, bool msaa)
+    : m_window(w)
+{
+    if (msaa) {
+        QSet<int> counts = w->supportedSampleCounts();
+        qDebug() << "Supported sample counts:" << counts;
+        for (int s = 16; s >= 4; s /= 2) {
+            if (counts.contains(s)) {
+                qDebug("Requesting sample count %d", s);
+                m_window->setSampleCount(s);
+                break;
+            }
+        }
+    }
+}
+
+VkShaderModule TriangleRenderer::createShader(const QString &name)
+{
+    QFile file(name);
+    if (!file.open(QIODevice::ReadOnly)) {
+        qWarning("Failed to read shader %s", qPrintable(name));
+        return VK_NULL_HANDLE;
+    }
+    QByteArray blob = file.readAll();
+    file.close();
+
+    VkShaderModuleCreateInfo shaderInfo;
+    memset(&shaderInfo, 0, sizeof(shaderInfo));
+    shaderInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
+    shaderInfo.codeSize = blob.size();
+    shaderInfo.pCode = reinterpret_cast<const uint32_t *>(blob.constData());
+    VkShaderModule shaderModule;
+    VkResult err = m_devFuncs->vkCreateShaderModule(m_window->device(), &shaderInfo, nullptr, &shaderModule);
+    if (err != VK_SUCCESS) {
+        qWarning("Failed to create shader module: %d", err);
+        return VK_NULL_HANDLE;
+    }
+
+    return shaderModule;
+}
+
+void TriangleRenderer::initResources()
+{
+    qDebug("initResources");
+
+    VkDevice dev = m_window->device();
+    m_devFuncs = m_window->vulkanInstance()->deviceFunctions(dev);
+
+    // Prepare the vertex and uniform data. The vertex data will never
+    // change so one buffer is sufficient regardless of the value of
+    // QVulkanWindow::CONCURRENT_FRAME_COUNT. Uniform data is changing per
+    // frame however so active frames have to have a dedicated copy.
+
+    // Use just one memory allocation and one buffer. We will then specify the
+    // appropriate offsets for uniform buffers in the VkDescriptorBufferInfo.
+    // Have to watch out for
+    // VkPhysicalDeviceLimits::minUniformBufferOffsetAlignment, though.
+
+    // The uniform buffer is not strictly required in this example, we could
+    // have used push constants as well since our single matrix (64 bytes) fits
+    // into the spec mandated minimum limit of 128 bytes. However, once that
+    // limit is not sufficient, the per-frame buffers, as shown below, will
+    // become necessary.
+
+    const int concurrentFrameCount = m_window->concurrentFrameCount();
+    const VkPhysicalDeviceLimits *pdevLimits = &m_window->physicalDeviceProperties()->limits;
+    const VkDeviceSize uniAlign = pdevLimits->minUniformBufferOffsetAlignment;
+    qDebug("uniform buffer offset alignment is %u", (uint) uniAlign);
+    VkBufferCreateInfo bufInfo;
+    memset(&bufInfo, 0, sizeof(bufInfo));
+    bufInfo.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
+    // Our internal layout is vertex, uniform, uniform, ... with each uniform buffer start offset aligned to uniAlign.
+    const VkDeviceSize vertexAllocSize = aligned(sizeof(vertexData), uniAlign);
+    const VkDeviceSize uniformAllocSize = aligned(UNIFORM_DATA_SIZE, uniAlign);
+    bufInfo.size = vertexAllocSize + concurrentFrameCount * uniformAllocSize;
+    bufInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT;
+
+    VkResult err = m_devFuncs->vkCreateBuffer(dev, &bufInfo, nullptr, &m_buf);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create buffer: %d", err);
+
+    VkMemoryRequirements memReq;
+    m_devFuncs->vkGetBufferMemoryRequirements(dev, m_buf, &memReq);
+
+    VkMemoryAllocateInfo memAllocInfo = {
+        VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO,
+        nullptr,
+        memReq.size,
+        m_window->hostVisibleMemoryIndex()
+    };
+
+    err = m_devFuncs->vkAllocateMemory(dev, &memAllocInfo, nullptr, &m_bufMem);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to allocate memory: %d", err);
+
+    err = m_devFuncs->vkBindBufferMemory(dev, m_buf, m_bufMem, 0);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to bind buffer memory: %d", err);
+
+    quint8 *p;
+    err = m_devFuncs->vkMapMemory(dev, m_bufMem, 0, memReq.size, 0, reinterpret_cast<void **>(&p));
+    if (err != VK_SUCCESS)
+        qFatal("Failed to map memory: %d", err);
+    memcpy(p, vertexData, sizeof(vertexData));
+    QMatrix4x4 ident;
+    memset(m_uniformBufInfo, 0, sizeof(m_uniformBufInfo));
+    for (int i = 0; i < concurrentFrameCount; ++i) {
+        const VkDeviceSize offset = vertexAllocSize + i * uniformAllocSize;
+        memcpy(p + offset, ident.constData(), 16 * sizeof(float));
+        m_uniformBufInfo[i].buffer = m_buf;
+        m_uniformBufInfo[i].offset = offset;
+        m_uniformBufInfo[i].range = uniformAllocSize;
+    }
+    m_devFuncs->vkUnmapMemory(dev, m_bufMem);
+
+    VkVertexInputBindingDescription vertexBindingDesc = {
+        0, // binding
+        5 * sizeof(float),
+        VK_VERTEX_INPUT_RATE_VERTEX
+    };
+    VkVertexInputAttributeDescription vertexAttrDesc[] = {
+        { // position
+            0, // location
+            0, // binding
+            VK_FORMAT_R32G32_SFLOAT,
+            0
+        },
+        { // color
+            1,
+            0,
+            VK_FORMAT_R32G32B32_SFLOAT,
+            2 * sizeof(float)
+        }
+    };
+
+    VkPipelineVertexInputStateCreateInfo vertexInputInfo;
+    vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
+    vertexInputInfo.pNext = nullptr;
+    vertexInputInfo.flags = 0;
+    vertexInputInfo.vertexBindingDescriptionCount = 1;
+    vertexInputInfo.pVertexBindingDescriptions = &vertexBindingDesc;
+    vertexInputInfo.vertexAttributeDescriptionCount = 2;
+    vertexInputInfo.pVertexAttributeDescriptions = vertexAttrDesc;
+
+    // Set up descriptor set and its layout.
+    VkDescriptorPoolSize descPoolSizes = { VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, uint32_t(concurrentFrameCount) };
+    VkDescriptorPoolCreateInfo descPoolInfo;
+    memset(&descPoolInfo, 0, sizeof(descPoolInfo));
+    descPoolInfo.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_POOL_CREATE_INFO;
+    descPoolInfo.maxSets = concurrentFrameCount;
+    descPoolInfo.poolSizeCount = 1;
+    descPoolInfo.pPoolSizes = &descPoolSizes;
+    err = m_devFuncs->vkCreateDescriptorPool(dev, &descPoolInfo, nullptr, &m_descPool);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create descriptor pool: %d", err);
+
+    VkDescriptorSetLayoutBinding layoutBinding = {
+        0, // binding
+        VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER,
+        1,
+        VK_SHADER_STAGE_VERTEX_BIT,
+        nullptr
+    };
+    VkDescriptorSetLayoutCreateInfo descLayoutInfo = {
+        VK_STRUCTURE_TYPE_DESCRIPTOR_SET_LAYOUT_CREATE_INFO,
+        nullptr,
+        0,
+        1,
+        &layoutBinding
+    };
+    err = m_devFuncs->vkCreateDescriptorSetLayout(dev, &descLayoutInfo, nullptr, &m_descSetLayout);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create descriptor set layout: %d", err);
+
+    for (int i = 0; i < concurrentFrameCount; ++i) {
+        VkDescriptorSetAllocateInfo descSetAllocInfo = {
+            VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO,
+            nullptr,
+            m_descPool,
+            1,
+            &m_descSetLayout
+        };
+        err = m_devFuncs->vkAllocateDescriptorSets(dev, &descSetAllocInfo, &m_descSet[i]);
+        if (err != VK_SUCCESS)
+            qFatal("Failed to allocate descriptor set: %d", err);
+
+        VkWriteDescriptorSet descWrite;
+        memset(&descWrite, 0, sizeof(descWrite));
+        descWrite.sType = VK_STRUCTURE_TYPE_WRITE_DESCRIPTOR_SET;
+        descWrite.dstSet = m_descSet[i];
+        descWrite.descriptorCount = 1;
+        descWrite.descriptorType = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
+        descWrite.pBufferInfo = &m_uniformBufInfo[i];
+        m_devFuncs->vkUpdateDescriptorSets(dev, 1, &descWrite, 0, nullptr);
+    }
+
+    // Pipeline cache
+    VkPipelineCacheCreateInfo pipelineCacheInfo;
+    memset(&pipelineCacheInfo, 0, sizeof(pipelineCacheInfo));
+    pipelineCacheInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_CACHE_CREATE_INFO;
+    err = m_devFuncs->vkCreatePipelineCache(dev, &pipelineCacheInfo, nullptr, &m_pipelineCache);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create pipeline cache: %d", err);
+
+    // Pipeline layout
+    VkPipelineLayoutCreateInfo pipelineLayoutInfo;
+    memset(&pipelineLayoutInfo, 0, sizeof(pipelineLayoutInfo));
+    pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
+    pipelineLayoutInfo.setLayoutCount = 1;
+    pipelineLayoutInfo.pSetLayouts = &m_descSetLayout;
+    err = m_devFuncs->vkCreatePipelineLayout(dev, &pipelineLayoutInfo, nullptr, &m_pipelineLayout);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create pipeline layout: %d", err);
+
+    // Shaders
+    VkShaderModule vertShaderModule = createShader(QStringLiteral(":/color_vert.spv"));
+    VkShaderModule fragShaderModule = createShader(QStringLiteral(":/color_frag.spv"));
+
+    // Graphics pipeline
+    VkGraphicsPipelineCreateInfo pipelineInfo;
+    memset(&pipelineInfo, 0, sizeof(pipelineInfo));
+    pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;
+
+    VkPipelineShaderStageCreateInfo shaderStages[2] = {
+        {
+            VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            nullptr,
+            0,
+            VK_SHADER_STAGE_VERTEX_BIT,
+            vertShaderModule,
+            "main",
+            nullptr
+        },
+        {
+            VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO,
+            nullptr,
+            0,
+            VK_SHADER_STAGE_FRAGMENT_BIT,
+            fragShaderModule,
+            "main",
+            nullptr
+        }
+    };
+    pipelineInfo.stageCount = 2;
+    pipelineInfo.pStages = shaderStages;
+
+    pipelineInfo.pVertexInputState = &vertexInputInfo;
+
+    VkPipelineInputAssemblyStateCreateInfo ia;
+    memset(&ia, 0, sizeof(ia));
+    ia.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;
+    ia.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;
+    pipelineInfo.pInputAssemblyState = &ia;
+
+    // The viewport and scissor will be set dynamically via vkCmdSetViewport/Scissor.
+    // This way the pipeline does not need to be touched when resizing the window.
+    VkPipelineViewportStateCreateInfo vp;
+    memset(&vp, 0, sizeof(vp));
+    vp.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;
+    vp.viewportCount = 1;
+    vp.scissorCount = 1;
+    pipelineInfo.pViewportState = &vp;
+
+    VkPipelineRasterizationStateCreateInfo rs;
+    memset(&rs, 0, sizeof(rs));
+    rs.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;
+    rs.polygonMode = VK_POLYGON_MODE_FILL;
+    rs.cullMode = VK_CULL_MODE_NONE; // we want the back face as well
+    rs.frontFace = VK_FRONT_FACE_COUNTER_CLOCKWISE;
+    rs.lineWidth = 1.0f;
+    pipelineInfo.pRasterizationState = &rs;
+
+    VkPipelineMultisampleStateCreateInfo ms;
+    memset(&ms, 0, sizeof(ms));
+    ms.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
+    // Enable multisampling.
+    ms.rasterizationSamples = m_window->sampleCountFlagBits();
+    pipelineInfo.pMultisampleState = &ms;
+
+    VkPipelineDepthStencilStateCreateInfo ds;
+    memset(&ds, 0, sizeof(ds));
+    ds.sType = VK_STRUCTURE_TYPE_PIPELINE_DEPTH_STENCIL_STATE_CREATE_INFO;
+    ds.depthTestEnable = VK_TRUE;
+    ds.depthWriteEnable = VK_TRUE;
+    ds.depthCompareOp = VK_COMPARE_OP_LESS_OR_EQUAL;
+    pipelineInfo.pDepthStencilState = &ds;
+
+    VkPipelineColorBlendStateCreateInfo cb;
+    memset(&cb, 0, sizeof(cb));
+    cb.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;
+    // no blend, write out all of rgba
+    VkPipelineColorBlendAttachmentState att;
+    memset(&att, 0, sizeof(att));
+    att.colorWriteMask = 0xF;
+    cb.attachmentCount = 1;
+    cb.pAttachments = &att;
+    pipelineInfo.pColorBlendState = &cb;
+
+    VkDynamicState dynEnable[] = { VK_DYNAMIC_STATE_VIEWPORT, VK_DYNAMIC_STATE_SCISSOR };
+    VkPipelineDynamicStateCreateInfo dyn;
+    memset(&dyn, 0, sizeof(dyn));
+    dyn.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;
+    dyn.dynamicStateCount = sizeof(dynEnable) / sizeof(VkDynamicState);
+    dyn.pDynamicStates = dynEnable;
+    pipelineInfo.pDynamicState = &dyn;
+
+    pipelineInfo.layout = m_pipelineLayout;
+    pipelineInfo.renderPass = m_window->defaultRenderPass();
+
+    err = m_devFuncs->vkCreateGraphicsPipelines(dev, m_pipelineCache, 1, &pipelineInfo, nullptr, &m_pipeline);
+    if (err != VK_SUCCESS)
+        qFatal("Failed to create graphics pipeline: %d", err);
+
+    if (vertShaderModule)
+        m_devFuncs->vkDestroyShaderModule(dev, vertShaderModule, nullptr);
+    if (fragShaderModule)
+        m_devFuncs->vkDestroyShaderModule(dev, fragShaderModule, nullptr);
+}
+
+void TriangleRenderer::initSwapChainResources()
+{
+    qDebug("initSwapChainResources");
+
+    // Projection matrix
+    m_proj = *m_window->clipCorrectionMatrix(); // adjust for Vulkan-OpenGL clip space differences
+    const QSize sz = m_window->swapChainImageSize();
+    m_proj.perspective(45.0f, sz.width() / (float) sz.height(), 0.01f, 100.0f);
+    m_proj.translate(0, 0, -4);
+}
+
+void TriangleRenderer::releaseSwapChainResources()
+{
+    qDebug("releaseSwapChainResources");
+}
+
+void TriangleRenderer::releaseResources()
+{
+    qDebug("releaseResources");
+
+    VkDevice dev = m_window->device();
+
+    if (m_pipeline) {
+        m_devFuncs->vkDestroyPipeline(dev, m_pipeline, nullptr);
+        m_pipeline = VK_NULL_HANDLE;
+    }
+
+    if (m_pipelineLayout) {
+        m_devFuncs->vkDestroyPipelineLayout(dev, m_pipelineLayout, nullptr);
+        m_pipelineLayout = VK_NULL_HANDLE;
+    }
+
+    if (m_pipelineCache) {
+        m_devFuncs->vkDestroyPipelineCache(dev, m_pipelineCache, nullptr);
+        m_pipelineCache = VK_NULL_HANDLE;
+    }
+
+    if (m_descSetLayout) {
+        m_devFuncs->vkDestroyDescriptorSetLayout(dev, m_descSetLayout, nullptr);
+        m_descSetLayout = VK_NULL_HANDLE;
+    }
+
+    if (m_descPool) {
+        m_devFuncs->vkDestroyDescriptorPool(dev, m_descPool, nullptr);
+        m_descPool = VK_NULL_HANDLE;
+    }
+
+    if (m_buf) {
+        m_devFuncs->vkDestroyBuffer(dev, m_buf, nullptr);
+        m_buf = VK_NULL_HANDLE;
+    }
+
+    if (m_bufMem) {
+        m_devFuncs->vkFreeMemory(dev, m_bufMem, nullptr);
+        m_bufMem = VK_NULL_HANDLE;
+    }
+}
+
+void TriangleRenderer::startNextFrame()
+{
+    VkDevice dev = m_window->device();
+    VkCommandBuffer cb = m_window->currentCommandBuffer();
+    const QSize sz = m_window->swapChainImageSize();
+
+    VkClearColorValue clearColor = { 0, 0, 0, 1 };
+    VkClearDepthStencilValue clearDS = { 1, 0 };
+    VkClearValue clearValues[3];
+    memset(clearValues, 0, sizeof(clearValues));
+    clearValues[0].color = clearValues[2].color = clearColor;
+    clearValues[1].depthStencil = clearDS;
+
+    VkRenderPassBeginInfo rpBeginInfo;
+    memset(&rpBeginInfo, 0, sizeof(rpBeginInfo));
+    rpBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+    rpBeginInfo.renderPass = m_window->defaultRenderPass();
+    rpBeginInfo.framebuffer = m_window->currentFramebuffer();
+    rpBeginInfo.renderArea.extent.width = sz.width();
+    rpBeginInfo.renderArea.extent.height = sz.height();
+    rpBeginInfo.clearValueCount = m_window->sampleCountFlagBits() > VK_SAMPLE_COUNT_1_BIT ? 3 : 2;
+    rpBeginInfo.pClearValues = clearValues;
+    VkCommandBuffer cmdBuf = m_window->currentCommandBuffer();
+    m_devFuncs->vkCmdBeginRenderPass(cmdBuf, &rpBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+    quint8 *p;
+    VkResult err = m_devFuncs->vkMapMemory(dev, m_bufMem, m_uniformBufInfo[m_window->currentFrame()].offset,
+            UNIFORM_DATA_SIZE, 0, reinterpret_cast<void **>(&p));
+    if (err != VK_SUCCESS)
+        qFatal("Failed to map memory: %d", err);
+    QMatrix4x4 m = m_proj;
+    m.rotate(m_rotation, 0, 1, 0);
+    memcpy(p, m.constData(), 16 * sizeof(float));
+    m_devFuncs->vkUnmapMemory(dev, m_bufMem);
+
+    // Not exactly a real animation system, just advance on every frame for now.
+    m_rotation += 1.0f;
+
+    m_devFuncs->vkCmdBindPipeline(cb, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipeline);
+    m_devFuncs->vkCmdBindDescriptorSets(cb, VK_PIPELINE_BIND_POINT_GRAPHICS, m_pipelineLayout, 0, 1,
+                               &m_descSet[m_window->currentFrame()], 0, nullptr);
+    VkDeviceSize vbOffset = 0;
+    m_devFuncs->vkCmdBindVertexBuffers(cb, 0, 1, &m_buf, &vbOffset);
+
+    VkViewport viewport;
+    viewport.x = viewport.y = 0;
+    viewport.width = sz.width();
+    viewport.height = sz.height();
+    viewport.minDepth = 0;
+    viewport.maxDepth = 1;
+    m_devFuncs->vkCmdSetViewport(cb, 0, 1, &viewport);
+
+    VkRect2D scissor;
+    scissor.offset.x = scissor.offset.y = 0;
+    scissor.extent.width = viewport.width;
+    scissor.extent.height = viewport.height;
+    m_devFuncs->vkCmdSetScissor(cb, 0, 1, &scissor);
+
+    m_devFuncs->vkCmdDraw(cb, 3, 1, 0, 0);
+
+    m_devFuncs->vkCmdEndRenderPass(cmdBuf);
+
+    m_window->frameReady();
+    m_window->requestUpdate(); // render continuously, throttled by the presentation rate
+}

examples/vulkan/shared/trianglerenderer.h

@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QVulkanWindow>
+
+class TriangleRenderer : public QVulkanWindowRenderer
+{
+public:
+    TriangleRenderer(QVulkanWindow *w, bool msaa = false);
+
+    void initResources() override;
+    void initSwapChainResources() override;
+    void releaseSwapChainResources() override;
+    void releaseResources() override;
+
+    void startNextFrame() override;
+
+protected:
+    VkShaderModule createShader(const QString &name);
+
+    QVulkanWindow *m_window;
+    QVulkanDeviceFunctions *m_devFuncs;
+
+    VkDeviceMemory m_bufMem = VK_NULL_HANDLE;
+    VkBuffer m_buf = VK_NULL_HANDLE;
+    VkDescriptorBufferInfo m_uniformBufInfo[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkDescriptorPool m_descPool = VK_NULL_HANDLE;
+    VkDescriptorSetLayout m_descSetLayout = VK_NULL_HANDLE;
+    VkDescriptorSet m_descSet[QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT];
+
+    VkPipelineCache m_pipelineCache = VK_NULL_HANDLE;
+    VkPipelineLayout m_pipelineLayout = VK_NULL_HANDLE;
+    VkPipeline m_pipeline = VK_NULL_HANDLE;
+
+    QMatrix4x4 m_proj;
+    float m_rotation = 0.0f;
+};

examples/vulkan/vulkan.pro

@@ -0,0 +1,7 @@
+TEMPLATE = subdirs
+
+SUBDIRS = hellovulkanwindow \
+          hellovulkantriangle \
+          hellovulkantexture
+
+qtHaveModule(widgets): SUBDIRS += hellovulkanwidget

src/gui/vulkan/qvulkanwindow.h

@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QVULKANWINDOW_H
+#define QVULKANWINDOW_H
+
+#include <QtGui/qtguiglobal.h>
+
+#if QT_CONFIG(vulkan)
+
+#include <QtGui/qvulkaninstance.h>
+#include <QtGui/qwindow.h>
+#include <QtGui/qimage.h>
+#include <QtGui/qmatrix4x4.h>
+#include <QtCore/qset.h>
+
+QT_BEGIN_NAMESPACE
+
+class QVulkanWindowPrivate;
+
+class Q_GUI_EXPORT QVulkanWindowRenderer
+{
+public:
+    virtual ~QVulkanWindowRenderer();
+
+    virtual void preInitResources();
+    virtual void initResources();
+    virtual void initSwapChainResources();
+    virtual void releaseSwapChainResources();
+    virtual void releaseResources();
+
+    virtual void startNextFrame() = 0;
+
+    virtual void physicalDeviceLost();
+    virtual void logicalDeviceLost();
+};
+
+class Q_GUI_EXPORT QVulkanWindow : public QWindow
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QVulkanWindow)
+
+public:
+    enum Flag {
+        PersistentResources = 0x01
+    };
+    Q_DECLARE_FLAGS(Flags, Flag)
+
+    explicit QVulkanWindow(QWindow *parent = nullptr);
+    ~QVulkanWindow();
+
+    void setFlags(Flags flags);
+    Flags flags() const;
+
+    QVector<VkPhysicalDeviceProperties> availablePhysicalDevices();
+    void setPhysicalDeviceIndex(int idx);
+
+    QVulkanInfoVector<QVulkanExtension> supportedDeviceExtensions();
+    void setDeviceExtensions(const QByteArrayList &extensions);
+
+    void setPreferredColorFormats(const QVector<VkFormat> &formats);
+
+    QSet<int> supportedSampleCounts();
+    void setSampleCount(int sampleCount);
+
+    bool isValid() const;
+
+    virtual QVulkanWindowRenderer *createRenderer();
+    void frameReady();
+
+    VkPhysicalDevice physicalDevice() const;
+    const VkPhysicalDeviceProperties *physicalDeviceProperties() const;
+    VkDevice device() const;
+    VkQueue graphicsQueue() const;
+    VkCommandPool graphicsCommandPool() const;
+    uint32_t hostVisibleMemoryIndex() const;
+    uint32_t deviceLocalMemoryIndex() const;
+    VkRenderPass defaultRenderPass() const;
+
+    VkFormat colorFormat() const;
+    VkFormat depthStencilFormat() const;
+    QSize swapChainImageSize() const;
+
+    VkCommandBuffer currentCommandBuffer() const;
+    VkFramebuffer currentFramebuffer() const;
+    int currentFrame() const;
+
+    static const int MAX_CONCURRENT_FRAME_COUNT = 3;
+    int concurrentFrameCount() const;
+
+    int swapChainImageCount() const;
+    int currentSwapChainImageIndex() const;
+    VkImage swapChainImage(int idx) const;
+    VkImageView swapChainImageView(int idx) const;
+    VkImage depthStencilImage() const;
+    VkImageView depthStencilImageView() const;
+
+    VkSampleCountFlagBits sampleCountFlagBits() const;
+    VkImage msaaColorImage(int idx) const;
+    VkImageView msaaColorImageView(int idx) const;
+
+    bool supportsGrab() const;
+    QImage grab();
+
+    const QMatrix4x4 *clipCorrectionMatrix();
+
+Q_SIGNALS:
+    void frameGrabbed(const QImage &image);
+
+protected:
+    void exposeEvent(QExposeEvent *) override;
+    void resizeEvent(QResizeEvent *) override;
+    bool event(QEvent *) override;
+
+private:
+    Q_DISABLE_COPY(QVulkanWindow)
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QVulkanWindow::Flags)
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(vulkan)
+
+#endif

src/gui/vulkan/qvulkanwindow_p.h

@@ -0,0 +1,188 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QVULKANWINDOW_P_H
+#define QVULKANWINDOW_P_H
+
+#include <QtGui/private/qtguiglobal_p.h>
+
+#if QT_CONFIG(vulkan)
+
+#include "qvulkanwindow.h"
+#include <QtCore/QHash>
+#include <private/qwindow_p.h>
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of a number of Qt sources files.  This header file may change from
+// version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+QT_BEGIN_NAMESPACE
+
+class QVulkanWindowPrivate : public QWindowPrivate
+{
+    Q_DECLARE_PUBLIC(QVulkanWindow)
+
+public:
+    ~QVulkanWindowPrivate();
+
+    void ensureStarted();
+    void init();
+    void reset();
+    bool createDefaultRenderPass();
+    void recreateSwapChain();
+    uint32_t chooseTransientImageMemType(VkImage img, uint32_t startIndex);
+    bool createTransientImage(VkFormat format, VkImageUsageFlags usage, VkImageAspectFlags aspectMask,
+                              VkImage *images, VkDeviceMemory *mem, VkImageView *views, int count);
+    void releaseSwapChain();
+    void beginFrame();
+    void endFrame();
+    bool checkDeviceLost(VkResult err);
+    void addReadback();
+    void finishBlockingReadback();
+
+    enum Status {
+        StatusUninitialized,
+        StatusFail,
+        StatusFailRetry,
+        StatusDeviceReady,
+        StatusReady
+    };
+    Status status = StatusUninitialized;
+    QVulkanWindowRenderer *renderer = nullptr;
+    QVulkanInstance *inst = nullptr;
+    VkSurfaceKHR surface = VK_NULL_HANDLE;
+    int physDevIndex = 0;
+    QVector<VkPhysicalDevice> physDevs;
+    QVector<VkPhysicalDeviceProperties> physDevProps;
+    QVulkanWindow::Flags flags = 0;
+    QByteArrayList requestedDevExtensions;
+    QHash<VkPhysicalDevice, QVulkanInfoVector<QVulkanExtension> > supportedDevExtensions;
+    QVector<VkFormat> requestedColorFormats;
+    VkSampleCountFlagBits sampleCount = VK_SAMPLE_COUNT_1_BIT;
+
+    VkDevice dev = VK_NULL_HANDLE;
+    QVulkanDeviceFunctions *devFuncs;
+    uint32_t gfxQueueFamilyIdx;
+    uint32_t presQueueFamilyIdx;
+    VkQueue gfxQueue;
+    VkQueue presQueue;
+    VkCommandPool cmdPool = VK_NULL_HANDLE;
+    VkCommandPool presCmdPool = VK_NULL_HANDLE;
+    uint32_t hostVisibleMemIndex;
+    uint32_t deviceLocalMemIndex;
+    VkFormat colorFormat;
+    VkColorSpaceKHR colorSpace;
+    VkFormat dsFormat = VK_FORMAT_D24_UNORM_S8_UINT;
+
+    PFN_vkCreateSwapchainKHR vkCreateSwapchainKHR = nullptr;
+    PFN_vkDestroySwapchainKHR vkDestroySwapchainKHR;
+    PFN_vkGetSwapchainImagesKHR vkGetSwapchainImagesKHR;
+    PFN_vkAcquireNextImageKHR vkAcquireNextImageKHR;
+    PFN_vkQueuePresentKHR vkQueuePresentKHR;
+    PFN_vkGetPhysicalDeviceSurfaceCapabilitiesKHR vkGetPhysicalDeviceSurfaceCapabilitiesKHR = nullptr;
+    PFN_vkGetPhysicalDeviceSurfaceFormatsKHR vkGetPhysicalDeviceSurfaceFormatsKHR;
+
+    static const int MAX_SWAPCHAIN_BUFFER_COUNT = 3;
+    static const int MAX_FRAME_LAG = QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT;
+    // QVulkanWindow only supports the always available FIFO mode. The
+    // rendering thread will get throttled to the presentation rate (vsync).
+    // This is in effect Example 5 from the VK_KHR_swapchain spec.
+    VkPresentModeKHR presentMode = VK_PRESENT_MODE_FIFO_KHR;
+    int swapChainBufferCount = 2;
+    int frameLag = 2;
+
+    QSize swapChainImageSize;
+    VkSwapchainKHR swapChain = VK_NULL_HANDLE;
+    bool swapChainSupportsReadBack = false;
+
+    struct ImageResources {
+        VkImage image = VK_NULL_HANDLE;
+        VkImageView imageView = VK_NULL_HANDLE;
+        VkCommandBuffer cmdBuf = VK_NULL_HANDLE;
+        VkFence cmdFence = VK_NULL_HANDLE;
+        bool cmdFenceWaitable = false;
+        VkFramebuffer fb = VK_NULL_HANDLE;
+        VkCommandBuffer presTransCmdBuf = VK_NULL_HANDLE;
+        VkImage msaaImage = VK_NULL_HANDLE;
+        VkImageView msaaImageView = VK_NULL_HANDLE;
+    } imageRes[MAX_SWAPCHAIN_BUFFER_COUNT];
+
+    VkDeviceMemory msaaImageMem = VK_NULL_HANDLE;
+
+    uint32_t currentImage;
+
+    struct FrameResources {
+        VkFence fence = VK_NULL_HANDLE;
+        bool fenceWaitable = false;
+        VkSemaphore imageSem = VK_NULL_HANDLE;
+        VkSemaphore drawSem = VK_NULL_HANDLE;
+        VkSemaphore presTransSem = VK_NULL_HANDLE;
+        bool imageAcquired = false;
+        bool imageSemWaitable = false;
+    } frameRes[MAX_FRAME_LAG];
+
+    uint32_t currentFrame;
+
+    VkRenderPass defaultRenderPass = VK_NULL_HANDLE;
+
+    VkDeviceMemory dsMem = VK_NULL_HANDLE;
+    VkImage dsImage = VK_NULL_HANDLE;
+    VkImageView dsView = VK_NULL_HANDLE;
+
+    bool framePending = false;
+    bool frameGrabbing = false;
+    QImage frameGrabTargetImage;
+    VkImage frameGrabImage = VK_NULL_HANDLE;
+    VkDeviceMemory frameGrabImageMem = VK_NULL_HANDLE;
+
+    QMatrix4x4 m_clipCorrect;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(vulkan)
+
+#endif

src/gui/vulkan/vulkan.pri

@@ -1,12 +1,15 @@
 qtConfig(vulkan) {
     HEADERS += \
         vulkan/qvulkaninstance.h \
-        vulkan/qplatformvulkaninstance.h
+        vulkan/qplatformvulkaninstance.h \
+        vulkan/qvulkanwindow.h \
+        vulkan/qvulkanwindow_p.h
 
     SOURCES += \
         vulkan/qvulkaninstance.cpp \
         vulkan/qplatformvulkaninstance.cpp \
-        vulkan/qvulkanfunctions.cpp
+        vulkan/qvulkanfunctions.cpp \
+        vulkan/qvulkanwindow.cpp
 
     # Applications must inherit the Vulkan header include path.
     QMAKE_USE += vulkan/nolink

tests/auto/gui/qvulkan/tst_qvulkan.cpp

@@ -28,7 +28,7 @@
 
 #include <QtGui/QVulkanInstance>
 #include <QtGui/QVulkanFunctions>
-#include <QtGui/QWindow>
+#include <QtGui/QVulkanWindow>
 
 #include <QtTest/QtTest>
 
@@ -41,8 +41,11 @@ class tst_QVulkan : public QObject
 private slots:
     void vulkanInstance();
     void vulkanCheckSupported();
-    void vulkanWindow();
+    void vulkanPlainWindow();
     void vulkanVersionRequest();
+    void vulkanWindow();
+    void vulkanWindowRenderer();
+    void vulkanWindowGrab();
 };
 
 void tst_QVulkan::vulkanInstance()
@@ -102,7 +105,7 @@ void tst_QVulkan::vulkanCheckSupported()
     }
 }
 
-void tst_QVulkan::vulkanWindow()
+void tst_QVulkan::vulkanPlainWindow()
 {
     QVulkanInstance inst;
     if (!inst.create())
@@ -154,6 +157,279 @@ void tst_QVulkan::vulkanVersionRequest()
     QCOMPARE(inst.errorCode(), VK_ERROR_INCOMPATIBLE_DRIVER);
 }
 
+static void waitForUnexposed(QWindow *w)
+{
+    QElapsedTimer timer;
+    timer.start();
+    while (w->isExposed()) {
+        int remaining = 5000 - int(timer.elapsed());
+        if (remaining <= 0)
+            break;
+        QCoreApplication::processEvents(QEventLoop::AllEvents, remaining);
+        QCoreApplication::sendPostedEvents(Q_NULLPTR, QEvent::DeferredDelete);
+        QTest::qSleep(10);
+    }
+}
+
+void tst_QVulkan::vulkanWindow()
+{
+    QVulkanInstance inst;
+    if (!inst.create())
+        QSKIP("Vulkan init failed; skip");
+
+    // First let's forget to set the instance.
+    QVulkanWindow w;
+    QVERIFY(!w.isValid());
+    w.resize(1024, 768);
+    w.show();
+    QTest::qWaitForWindowExposed(&w);
+    QVERIFY(!w.isValid());
+
+    // Now set it. A simple hide - show should be enough to correct, this, no
+    // need for a full destroy - create.
+    w.hide();
+    waitForUnexposed(&w);
+    w.setVulkanInstance(&inst);
+    QVector<VkPhysicalDeviceProperties> pdevs = w.availablePhysicalDevices();
+    if (pdevs.isEmpty())
+        QSKIP("No Vulkan physical devices; skip");
+    w.show();
+    QTest::qWaitForWindowExposed(&w);
+    QVERIFY(w.isValid());
+    QCOMPARE(w.vulkanInstance(), &inst);
+    QVulkanInfoVector<QVulkanExtension> exts = w.supportedDeviceExtensions();
+
+    // Now destroy and recreate.
+    w.destroy();
+    waitForUnexposed(&w);
+    QVERIFY(!w.isValid());
+    // check that flags can be set between a destroy() - show()
+    w.setFlags(QVulkanWindow::PersistentResources);
+    // supported lists can be queried before expose too
+    QVERIFY(w.supportedDeviceExtensions() == exts);
+    w.show();
+    QTest::qWaitForWindowExposed(&w);
+    QVERIFY(w.isValid());
+    QVERIFY(w.flags().testFlag(QVulkanWindow::PersistentResources));
+
+    QVERIFY(w.physicalDevice() != VK_NULL_HANDLE);
+    QVERIFY(w.physicalDeviceProperties() != nullptr);
+    QVERIFY(w.device() != VK_NULL_HANDLE);
+    QVERIFY(w.graphicsQueue() != VK_NULL_HANDLE);
+    QVERIFY(w.graphicsCommandPool() != VK_NULL_HANDLE);
+    QVERIFY(w.defaultRenderPass() != VK_NULL_HANDLE);
+
+    QVERIFY(w.concurrentFrameCount() > 0);
+    QVERIFY(w.concurrentFrameCount() <= QVulkanWindow::MAX_CONCURRENT_FRAME_COUNT);
+}
+
+class TestVulkanRenderer;
+
+class TestVulkanWindow : public QVulkanWindow
+{
+public:
+    QVulkanWindowRenderer *createRenderer() override;
+
+private:
+    TestVulkanRenderer *m_renderer = nullptr;
+};
+
+struct TestVulkan {
+    int preInitResCount = 0;
+    int initResCount = 0;
+    int initSwcResCount = 0;
+    int releaseResCount = 0;
+    int releaseSwcResCount = 0;
+    int startNextFrameCount = 0;
+} testVulkan;
+
+class TestVulkanRenderer : public QVulkanWindowRenderer
+{
+public:
+    TestVulkanRenderer(QVulkanWindow *w) : m_window(w) { }
+
+    void preInitResources() override;
+    void initResources() override;
+    void initSwapChainResources() override;
+    void releaseSwapChainResources() override;
+    void releaseResources() override;
+
+    void startNextFrame() override;
+
+private:
+    QVulkanWindow *m_window;
+    QVulkanDeviceFunctions *m_devFuncs;
+};
+
+void TestVulkanRenderer::preInitResources()
+{
+    if (testVulkan.initResCount) {
+        qWarning("initResources called before preInitResources?!");
+        testVulkan.preInitResCount = -1;
+        return;
+    }
+
+    // Ensure the physical device and the surface are available at this stage.
+    VkPhysicalDevice physDev = m_window->physicalDevice();
+    if (physDev == VK_NULL_HANDLE) {
+        qWarning("No physical device in preInitResources");
+        testVulkan.preInitResCount = -1;
+        return;
+    }
+    VkSurfaceKHR surface = m_window->vulkanInstance()->surfaceForWindow(m_window);
+    if (surface == VK_NULL_HANDLE) {
+        qWarning("No surface in preInitResources");
+        testVulkan.preInitResCount = -1;
+        return;
+    }
+
+    ++testVulkan.preInitResCount;
+}
+
+void TestVulkanRenderer::initResources()
+{
+    m_devFuncs = m_window->vulkanInstance()->deviceFunctions(m_window->device());
+    ++testVulkan.initResCount;
+}
+
+void TestVulkanRenderer::initSwapChainResources()
+{
+    ++testVulkan.initSwcResCount;
+}
+
+void TestVulkanRenderer::releaseSwapChainResources()
+{
+    ++testVulkan.releaseSwcResCount;
+}
+
+void TestVulkanRenderer::releaseResources()
+{
+    ++testVulkan.releaseResCount;
+}
+
+void TestVulkanRenderer::startNextFrame()
+{
+    ++testVulkan.startNextFrameCount;
+
+    VkClearColorValue clearColor = { 0, 1, 0, 1 };
+    VkClearDepthStencilValue clearDS = { 1, 0 };
+    VkClearValue clearValues[2];
+    memset(clearValues, 0, sizeof(clearValues));
+    clearValues[0].color = clearColor;
+    clearValues[1].depthStencil = clearDS;
+
+    VkRenderPassBeginInfo rpBeginInfo;
+    memset(&rpBeginInfo, 0, sizeof(rpBeginInfo));
+    rpBeginInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_BEGIN_INFO;
+    rpBeginInfo.renderPass = m_window->defaultRenderPass();
+    rpBeginInfo.framebuffer = m_window->currentFramebuffer();
+    const QSize sz = m_window->swapChainImageSize();
+    rpBeginInfo.renderArea.extent.width = sz.width();
+    rpBeginInfo.renderArea.extent.height = sz.height();
+    rpBeginInfo.clearValueCount = 2;
+    rpBeginInfo.pClearValues = clearValues;
+    VkCommandBuffer cmdBuf = m_window->currentCommandBuffer();
+    m_devFuncs->vkCmdBeginRenderPass(cmdBuf, &rpBeginInfo, VK_SUBPASS_CONTENTS_INLINE);
+
+    m_devFuncs->vkCmdEndRenderPass(cmdBuf);
+
+    m_window->frameReady();
+}
+
+QVulkanWindowRenderer *TestVulkanWindow::createRenderer()
+{
+    Q_ASSERT(!m_renderer);
+    m_renderer = new TestVulkanRenderer(this);
+    return m_renderer;
+}
+
+void tst_QVulkan::vulkanWindowRenderer()
+{
+    QVulkanInstance inst;
+    if (!inst.create())
+        QSKIP("Vulkan init failed; skip");
+
+    testVulkan = TestVulkan();
+
+    TestVulkanWindow w;
+    w.setVulkanInstance(&inst);
+    w.resize(1024, 768);
+    w.show();
+    QTest::qWaitForWindowExposed(&w);
+
+    if (w.availablePhysicalDevices().isEmpty())
+        QSKIP("No Vulkan physical devices; skip");
+
+    QVERIFY(testVulkan.preInitResCount == 1);
+    QVERIFY(testVulkan.initResCount == 1);
+    QVERIFY(testVulkan.initSwcResCount == 1);
+    // this has to be QTRY due to the async update in QVulkanWindowPrivate::ensureStarted()
+    QTRY_VERIFY(testVulkan.startNextFrameCount >= 1);
+
+    QVERIFY(!w.swapChainImageSize().isEmpty());
+    QVERIFY(w.colorFormat() != VK_FORMAT_UNDEFINED);
+    QVERIFY(w.depthStencilFormat() != VK_FORMAT_UNDEFINED);
+
+    w.destroy();
+    waitForUnexposed(&w);
+    QVERIFY(testVulkan.releaseSwcResCount == 1);
+    QVERIFY(testVulkan.releaseResCount == 1);
+}
+
+void tst_QVulkan::vulkanWindowGrab()
+{
+    QVulkanInstance inst;
+    inst.setLayers(QByteArrayList() << "VK_LAYER_LUNARG_standard_validation");
+    if (!inst.create())
+        QSKIP("Vulkan init failed; skip");
+
+    testVulkan = TestVulkan();
+
+    TestVulkanWindow w;
+    w.setVulkanInstance(&inst);
+    w.resize(1024, 768);
+    w.show();
+    QTest::qWaitForWindowExposed(&w);
+
+    if (w.availablePhysicalDevices().isEmpty())
+        QSKIP("No Vulkan physical devices; skip");
+
+    if (!w.supportsGrab())
+        QSKIP("No grab support; skip");
+
+    QVERIFY(!w.swapChainImageSize().isEmpty());
+
+    QImage img1 = w.grab();
+    QImage img2 = w.grab();
+    QImage img3 = w.grab();
+
+    QVERIFY(!img1.isNull());
+    QVERIFY(!img2.isNull());
+    QVERIFY(!img3.isNull());
+
+    QCOMPARE(img1.size(), w.swapChainImageSize());
+    QCOMPARE(img2.size(), w.swapChainImageSize());
+    QCOMPARE(img3.size(), w.swapChainImageSize());
+
+    QRgb a = img1.pixel(10, 20);
+    QRgb b = img2.pixel(5, 5);
+    QRgb c = img3.pixel(50, 30);
+
+    QCOMPARE(a, b);
+    QCOMPARE(b, c);
+    QRgb refPixel = qRgb(0, 255, 0);
+
+    int redFuzz = qAbs(qRed(a) - qRed(refPixel));
+    int greenFuzz = qAbs(qGreen(a) - qGreen(refPixel));
+    int blueFuzz = qAbs(qBlue(a) - qBlue(refPixel));
+
+    QVERIFY(redFuzz <= 1);
+    QVERIFY(blueFuzz <= 1);
+    QVERIFY(greenFuzz <= 1);
+
+    w.destroy();
+}
+
 QTEST_MAIN(tst_QVulkan)
 
 #include "tst_qvulkan.moc"