Basic Vulkan enablers

For Android, Windows and xcb. Verified on Win10 with NVIDIA, Win10
with AMD, Android with Tegra K1, Android aarch64 with Tegra X1, and
Linux aarch64 with Tegra X1 (Jetson TX1, L4T).

Introduce QPA-based Vulkan library loader, core function resolver, and
instance creation support. In addition to creating a new VkInstance,
adopting an existing one from an external engine is supported as well.

The WSI specifics are hidden in the platform plugins. Vulkan-capable
windows use the new surface type VulkanSurface and are associated with
a QVulkanInstance.

On Windows VULKAN_SDK is picked up automatically so finding vulkan.h
needs no additional manual steps once the LunarG SDK is installed.

[ChangeLog][QtGui] Added support for rendering to QWindow via the Vulkan
graphics API.

Task-number: QTBUG-55981
Change-Id: I50fa92d313fa440e0cc73939c6d7510ca317fbc9
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

9 files changed, 311 insertions, 13 deletions

diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index 316f93e3ac..6614c76a53 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -606,4 +606,11 @@ void QWindowsIntegration::beep() const
     MessageBeep(MB_OK);  // For QApplication
 }
 
+#if QT_CONFIG(vulkan)
+QPlatformVulkanInstance *QWindowsIntegration::createPlatformVulkanInstance(QVulkanInstance *instance) const
+{
+    return new QWindowsVulkanInstance(instance);
+}
+#endif
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowsintegration.h b/src/plugins/platforms/windows/qwindowsintegration.h
index 607203829f..fbdb341dab 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.h
+++ b/src/plugins/platforms/windows/qwindowsintegration.h
@@ -113,6 +113,10 @@ public:
     QPlatformSessionManager *createPlatformSessionManager(const QString &id, const QString &key) const override;
 #endif
 
+#if QT_CONFIG(vulkan)
+    QPlatformVulkanInstance *createPlatformVulkanInstance(QVulkanInstance *instance) const override;
+#endif
+
 protected:
     virtual QWindowsWindow *createPlatformWindowHelper(QWindow *window, const QWindowsWindowData &) const;
 
diff --git a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
index d750eef19d..8bc2e1b441 100644
--- a/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
+++ b/src/plugins/platforms/windows/qwindowsnativeinterface.cpp
@@ -64,7 +64,8 @@ enum ResourceType {
     HandleType,
     GlHandleType,
     GetDCType,
-    ReleaseDCType
+    ReleaseDCType,
+    VkSurface
 };
 
 static int resourceType(const QByteArray &key)
@@ -77,7 +78,8 @@ static int resourceType(const QByteArray &key)
         "handle",
         "glhandle",
         "getdc",
-        "releasedc"
+        "releasedc",
+        "vkSurface"
     };
     const char ** const end = names + sizeof(names) / sizeof(names[0]);
     const char **result = std::find(names, end, key);
@@ -112,6 +114,12 @@ void *QWindowsNativeInterface::nativeResourceForWindow(const QByteArray &resourc
     case QWindow::OpenGLSurface:
     case QWindow::OpenVGSurface:
         break;
+#if QT_CONFIG(vulkan)
+    case QWindow::VulkanSurface:
+        if (type == VkSurface)
+            return bw->surface(nullptr, nullptr); // returns the address of the VkSurfaceKHR, not the value, as expected
+        break;
+#endif
     }
     qWarning("%s: Invalid key '%s' requested.", __FUNCTION__, resource.constData());
     return 0;
diff --git a/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp b/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp
new file mode 100644
index 0000000000..d81ee8ba29
--- /dev/null
+++ b/src/plugins/platforms/windows/qwindowsvulkaninstance.cpp
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of plugins 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwindowsvulkaninstance.h"
+
+QT_BEGIN_NAMESPACE
+
+QWindowsVulkanInstance::QWindowsVulkanInstance(QVulkanInstance *instance)
+    : m_instance(instance),
+      m_getPhysDevPresSupport(nullptr),
+      m_createSurface(nullptr),
+      m_destroySurface(nullptr)
+{
+    if (qEnvironmentVariableIsSet("QT_VULKAN_LIB"))
+        m_lib.setFileName(QString::fromUtf8(qgetenv("QT_VULKAN_LIB")));
+    else
+        m_lib.setFileName(QStringLiteral("vulkan-1"));
+
+    if (!m_lib.load()) {
+        qWarning("Failed to load %s: %s", qPrintable(m_lib.fileName()), qPrintable(m_lib.errorString()));
+        return;
+    }
+
+    init(&m_lib);
+}
+
+void QWindowsVulkanInstance::createOrAdoptInstance()
+{
+    initInstance(m_instance, QByteArrayList() << QByteArrayLiteral("VK_KHR_win32_surface"));
+
+    if (!m_vkInst)
+        return;
+
+    m_getPhysDevPresSupport = reinterpret_cast<PFN_vkGetPhysicalDeviceWin32PresentationSupportKHR>(
+                m_vkGetInstanceProcAddr(m_vkInst, "vkGetPhysicalDeviceWin32PresentationSupportKHR"));
+    if (!m_getPhysDevPresSupport)
+        qWarning("Failed to find vkGetPhysicalDeviceWin32PresentationSupportKHR");
+}
+
+QWindowsVulkanInstance::~QWindowsVulkanInstance()
+{
+}
+
+bool QWindowsVulkanInstance::supportsPresent(VkPhysicalDevice physicalDevice,
+                                             uint32_t queueFamilyIndex,
+                                             QWindow *window)
+{
+    if (!m_getPhysDevPresSupport || !m_getPhysDevSurfaceSupport)
+        return true;
+
+    bool ok = m_getPhysDevPresSupport(physicalDevice, queueFamilyIndex);
+
+    VkSurfaceKHR surface = QVulkanInstance::surfaceForWindow(window);
+    VkBool32 supported = false;
+    m_getPhysDevSurfaceSupport(physicalDevice, queueFamilyIndex, surface, &supported);
+    ok &= bool(supported);
+
+    return ok;
+}
+
+VkSurfaceKHR QWindowsVulkanInstance::createSurface(HWND win)
+{
+    VkSurfaceKHR surface = 0;
+
+    if (!m_createSurface) {
+        m_createSurface = reinterpret_cast<PFN_vkCreateWin32SurfaceKHR>(
+                    m_vkGetInstanceProcAddr(m_vkInst, "vkCreateWin32SurfaceKHR"));
+    }
+    if (!m_createSurface) {
+        qWarning("Failed to find vkCreateWin32SurfaceKHR");
+        return surface;
+    }
+    if (!m_destroySurface) {
+        m_destroySurface = reinterpret_cast<PFN_vkDestroySurfaceKHR>(
+                    m_vkGetInstanceProcAddr(m_vkInst, "vkDestroySurfaceKHR"));
+    }
+    if (!m_destroySurface) {
+        qWarning("Failed to find vkDestroySurfaceKHR");
+        return surface;
+    }
+
+    VkWin32SurfaceCreateInfoKHR surfaceInfo;
+    memset(&surfaceInfo, 0, sizeof(surfaceInfo));
+    surfaceInfo.sType = VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR;
+    surfaceInfo.hinstance = GetModuleHandle(nullptr);
+    surfaceInfo.hwnd = win;
+    VkResult err = m_createSurface(m_vkInst, &surfaceInfo, nullptr, &surface);
+    if (err != VK_SUCCESS)
+        qWarning("Failed to create Vulkan surface: %d", err);
+
+    return surface;
+}
+
+void QWindowsVulkanInstance::destroySurface(VkSurfaceKHR surface)
+{
+    if (m_destroySurface && surface)
+        m_destroySurface(m_vkInst, surface, nullptr);
+}
+
+QT_END_NAMESPACE
diff --git a/src/plugins/platforms/windows/qwindowsvulkaninstance.h b/src/plugins/platforms/windows/qwindowsvulkaninstance.h
new file mode 100644
index 0000000000..ca60ab7627
--- /dev/null
+++ b/src/plugins/platforms/windows/qwindowsvulkaninstance.h
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of plugins 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 QWINDOWSVULKANINSTANCE_H
+#define QWINDOWSVULKANINSTANCE_H
+
+#if defined(VULKAN_H_) && !defined(VK_USE_PLATFORM_WIN32_KHR)
+#error "vulkan.h included without Win32 WSI"
+#endif
+
+#define VK_USE_PLATFORM_WIN32_KHR
+
+#include <QtVulkanSupport/private/qbasicvulkanplatforminstance_p.h>
+#include <QLibrary>
+
+QT_BEGIN_NAMESPACE
+
+class QWindowsVulkanInstance : public QBasicPlatformVulkanInstance
+{
+public:
+    QWindowsVulkanInstance(QVulkanInstance *instance);
+    ~QWindowsVulkanInstance();
+
+    void createOrAdoptInstance() override;
+    bool supportsPresent(VkPhysicalDevice physicalDevice, uint32_t queueFamilyIndex, QWindow *window) override;
+
+    VkSurfaceKHR createSurface(HWND win);
+    void destroySurface(VkSurfaceKHR surface);
+
+private:
+    QVulkanInstance *m_instance;
+    QLibrary m_lib;
+    PFN_vkGetPhysicalDeviceWin32PresentationSupportKHR m_getPhysDevPresSupport;
+    PFN_vkCreateWin32SurfaceKHR m_createSurface;
+    PFN_vkDestroySurfaceKHR m_destroySurface;
+};
+
+QT_END_NAMESPACE
+
+#endif // QWINDOWSVULKANINSTANCE_H
diff --git a/src/plugins/platforms/windows/qwindowswindow.cpp b/src/plugins/platforms/windows/qwindowswindow.cpp
index 8950ec3bfc..25f7e11c60 100644
--- a/src/plugins/platforms/windows/qwindowswindow.cpp
+++ b/src/plugins/platforms/windows/qwindowswindow.cpp
@@ -67,6 +67,10 @@
 
 #include <dwmapi.h>
 
+#if QT_CONFIG(vulkan)
+#include "qwindowsvulkaninstance.h"
+#endif
+
 QT_BEGIN_NAMESPACE
 
 enum {
@@ -308,13 +312,15 @@ static QWindow::Visibility windowVisibility_sys(HWND hwnd)
     return QWindow::Windowed;
 }
 
-static inline bool windowIsOpenGL(const QWindow *w)
+static inline bool windowIsAccelerated(const QWindow *w)
 {
     switch (w->surfaceType()) {
     case QSurface::OpenGLSurface:
         return true;
     case QSurface::RasterGLSurface:
         return qt_window_private(const_cast<QWindow *>(w))->compositing;
+    case QSurface::VulkanSurface:
+        return true;
     default:
         return false;
     }
@@ -375,11 +381,11 @@ bool QWindowsWindow::setWindowLayered(HWND hwnd, Qt::WindowFlags flags, bool has
     return needsLayered;
 }
 
-static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, bool openGL, qreal level)
+static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, bool accelerated, qreal level)
 {
     if (QWindowsWindow::setWindowLayered(hwnd, flags, hasAlpha, level)) {
         const BYTE alpha = BYTE(qRound(255.0 * level));
-        if (hasAlpha && !openGL && (flags & Qt::FramelessWindowHint)) {
+        if (hasAlpha && !accelerated && (flags & Qt::FramelessWindowHint)) {
             // Non-GL windows with alpha: Use blend function to update.
             BLENDFUNCTION blend = {AC_SRC_OVER, 0, alpha, AC_SRC_ALPHA};
             UpdateLayeredWindow(hwnd, NULL, NULL, NULL, NULL, NULL, 0, &blend, ULW_ALPHA);
@@ -393,13 +399,13 @@ static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, bo
 
 static inline void updateGLWindowSettings(const QWindow *w, HWND hwnd, Qt::WindowFlags flags, qreal opacity)
 {
-    const bool isGL = windowIsOpenGL(w);
+    const bool isAccelerated = windowIsAccelerated(w);
     const bool hasAlpha = w->format().hasAlpha();
 
-    if (isGL && hasAlpha)
+    if (isAccelerated && hasAlpha)
         applyBlurBehindWindow(hwnd);
 
-    setWindowOpacity(hwnd, flags, hasAlpha, isGL, opacity);
+    setWindowOpacity(hwnd, flags, hasAlpha, isAccelerated, opacity);
 }
 
 /*!
@@ -1053,6 +1059,9 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const QWindowsWindowData &data)
     m_data(data),
     m_cursor(new CursorHandle),
     m_format(aWindow->requestedFormat())
+#if QT_CONFIG(vulkan)
+  , m_vkSurface(0)
+#endif
 {
     // Clear the creation context as the window can be found in QWindowsContext's map.
     QWindowsContext::instance()->setWindowCreationContext(QSharedPointer<QWindowCreationContext>());
@@ -1068,6 +1077,10 @@ QWindowsWindow::QWindowsWindow(QWindow *aWindow, const QWindowsWindowData &data)
             setFlag(OpenGL_ES2);
     }
 #endif // QT_NO_OPENGL
+#if QT_CONFIG(vulkan)
+    if (aWindow->surfaceType() == QSurface::VulkanSurface)
+        setFlag(VulkanSurface);
+#endif
     updateDropSite(window()->isTopLevel());
 
     registerTouchWindow();
@@ -1121,6 +1134,14 @@ void QWindowsWindow::destroyWindow()
         if (hasMouseCapture())
             setMouseGrabEnabled(false);
         setDropSiteEnabled(false);
+#if QT_CONFIG(vulkan)
+        if (m_vkSurface) {
+            QVulkanInstance *inst = window()->vulkanInstance();
+            if (inst)
+                static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
+            m_vkSurface = 0;
+        }
+#endif
 #ifndef QT_NO_OPENGL
         if (m_surface) {
             if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
@@ -1470,8 +1491,10 @@ void QWindowsWindow::handleHidden()
 void QWindowsWindow::handleCompositionSettingsChanged()
 {
     const QWindow *w = window();
-    if (w->surfaceType() == QWindow::OpenGLSurface && w->format().hasAlpha())
+    if ((w->surfaceType() == QWindow::OpenGLSurface || w->surfaceType() == QWindow::VulkanSurface)
+            && w->format().hasAlpha()) {
         applyBlurBehindWindow(handle());
+    }
 }
 
 static QRect normalFrameGeometry(HWND hwnd)
@@ -1693,8 +1716,11 @@ bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
     BeginPaint(hwnd, &ps);
 
     // Observed painting problems with Aero style disabled (QTBUG-7865).
-    if (Q_UNLIKELY(testFlag(OpenGLSurface) && testFlag(OpenGLDoubleBuffered) && !dwmIsCompositionEnabled()))
+    if (Q_UNLIKELY(!dwmIsCompositionEnabled())
+            && ((testFlag(OpenGLSurface) && testFlag(OpenGLDoubleBuffered)) || testFlag(VulkanSurface)))
+    {
         SelectClipRgn(ps.hdc, NULL);
+    }
 
     // If the a window is obscured by another window (such as a child window)
     // we still need to send isExposed=true, for compatibility.
@@ -2030,7 +2056,7 @@ void QWindowsWindow::setOpacity(qreal level)
         m_opacity = level;
         if (m_data.hwnd)
             setWindowOpacity(m_data.hwnd, m_data.flags,
-                             window()->format().hasAlpha(), testFlag(OpenGLSurface),
+                             window()->format().hasAlpha(), testFlag(OpenGLSurface) || testFlag(VulkanSurface),
                              level);
     }
 }
@@ -2448,11 +2474,27 @@ void QWindowsWindow::setCustomMargins(const QMargins &newCustomMargins)
 
 void *QWindowsWindow::surface(void *nativeConfig, int *err)
 {
-#ifdef QT_NO_OPENGL
+#if QT_CONFIG(vulkan)
+    Q_UNUSED(nativeConfig);
+    Q_UNUSED(err);
+    if (window()->surfaceType() == QSurface::VulkanSurface) {
+        if (!m_vkSurface) {
+            QVulkanInstance *inst = window()->vulkanInstance();
+            if (inst)
+                m_vkSurface = static_cast<QWindowsVulkanInstance *>(inst->handle())->createSurface(handle());
+            else
+                qWarning("Attempted to create Vulkan surface without an instance; was QWindow::setVulkanInstance() called?");
+        }
+        // Different semantics for VkSurfaces: the return value is the address,
+        // not the value, given that this is a 64-bit handle even on x86.
+        return &m_vkSurface;
+    }
+#elif defined(QT_NO_OPENGL)
     Q_UNUSED(err)
     Q_UNUSED(nativeConfig)
     return 0;
-#else
+#endif
+#ifndef QT_NO_OPENGL
     if (!m_surface) {
         if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
             m_surface = staticOpenGLContext->createWindowSurface(m_data.hwnd, nativeConfig, err);
@@ -2464,6 +2506,14 @@ void *QWindowsWindow::surface(void *nativeConfig, int *err)
 
 void QWindowsWindow::invalidateSurface()
 {
+#if QT_CONFIG(vulkan)
+    if (m_vkSurface) {
+        QVulkanInstance *inst = window()->vulkanInstance();
+        if (inst)
+            static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
+        m_vkSurface = 0;
+    }
+#endif
 #ifndef QT_NO_OPENGL
     if (m_surface) {
         if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
diff --git a/src/plugins/platforms/windows/qwindowswindow.h b/src/plugins/platforms/windows/qwindowswindow.h
index b55529588c..46236c10b5 100644
--- a/src/plugins/platforms/windows/qwindowswindow.h
+++ b/src/plugins/platforms/windows/qwindowswindow.h
@@ -46,6 +46,10 @@
 #include <qpa/qplatformwindow.h>
 #include <QtPlatformHeaders/qwindowswindowfunctions.h>
 
+#if QT_CONFIG(vulkan)
+#include "qwindowsvulkaninstance.h"
+#endif
+
 QT_BEGIN_NAMESPACE
 
 class QWindowsOleDropTarget;
@@ -209,6 +213,7 @@ public:
         Compositing = 0x200000,
         HasBorderInFullScreen = 0x400000,
         WithinDpiChanged = 0x800000,
+        VulkanSurface = 0x1000000
     };
 
     QWindowsWindow(QWindow *window, const QWindowsWindowData &data);
@@ -351,6 +356,11 @@ private:
     HICON m_iconSmall = 0;
     HICON m_iconBig = 0;
     void *m_surface = nullptr;
+
+#if QT_CONFIG(vulkan)
+    // note: intentionally not using void * in order to avoid breaking x86
+    VkSurfaceKHR m_vkSurface = 0;
+#endif
 };
 
 #ifndef QT_NO_DEBUG_STREAM
diff --git a/src/plugins/platforms/windows/windows.pri b/src/plugins/platforms/windows/windows.pri
index 1a80526aab..7694824d20 100644
--- a/src/plugins/platforms/windows/windows.pri
+++ b/src/plugins/platforms/windows/windows.pri
@@ -68,6 +68,11 @@ qtConfig(dynamicgl) {
     HEADERS += $$PWD/qwindowseglcontext.h
 }
 
+qtConfig(vulkan) {
+    SOURCES += $$PWD/qwindowsvulkaninstance.cpp
+    HEADERS += $$PWD/qwindowsvulkaninstance.h
+}
+
 !contains( DEFINES, QT_NO_CLIPBOARD ) {
     SOURCES += $$PWD/qwindowsclipboard.cpp
     HEADERS += $$PWD/qwindowsclipboard.h
diff --git a/src/plugins/platforms/windows/windows.pro b/src/plugins/platforms/windows/windows.pro
index 23168c10dc..4d788d91f8 100644
--- a/src/plugins/platforms/windows/windows.pro
+++ b/src/plugins/platforms/windows/windows.pro
@@ -5,6 +5,8 @@ QT += \
     eventdispatcher_support-private accessibility_support-private \
     fontdatabase_support-private theme_support-private
 
+qtConfig(vulkan): QT += vulkan_support-private
+
 LIBS += -lgdi32 -ldwmapi
 
 include(windows.pri)