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diff --git a/src/gui/vulkan/qplatformvulkaninstance.h b/src/gui/vulkan/qplatformvulkaninstance.h
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+++ b/src/gui/vulkan/qplatformvulkaninstance.h
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+/****************************************************************************
+**
+** 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 QPLATFORMVULKANINSTANCE_H
+#define QPLATFORMVULKANINSTANCE_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is part of the QPA API and is not meant to be used
+// in applications. Usage of this API may make your code
+// source and binary incompatible with future versions of Qt.
+//
+
+#include <QtGui/qtguiglobal.h>
+
+#if QT_CONFIG(vulkan) || defined(Q_CLANG_QDOC)
+
+#include <qvulkaninstance.h>
+
+QT_BEGIN_NAMESPACE
+
+class QPlatformVulkanInstancePrivate;
+
+class Q_GUI_EXPORT QPlatformVulkanInstance
+{
+    Q_DECLARE_PRIVATE(QPlatformVulkanInstance)
+
+public:
+    QPlatformVulkanInstance();
+    virtual ~QPlatformVulkanInstance();
+
+    virtual QVulkanInfoVector<QVulkanLayer> supportedLayers() const = 0;
+    virtual QVulkanInfoVector<QVulkanExtension> supportedExtensions() const = 0;
+    virtual void createOrAdoptInstance() = 0;
+    virtual bool isValid() const = 0;
+    virtual VkResult errorCode() const = 0;
+    virtual VkInstance vkInstance() const = 0;
+    virtual QByteArrayList enabledLayers() const = 0;
+    virtual QByteArrayList enabledExtensions() const = 0;
+    virtual PFN_vkVoidFunction getInstanceProcAddr(const char *name) = 0;
+    virtual bool supportsPresent(VkPhysicalDevice physicalDevice, uint32_t queueFamilyIndex, QWindow *window) = 0;
+    virtual void presentQueued(QWindow *window);
+
+private:
+    QScopedPointer<QPlatformVulkanInstancePrivate> d_ptr;
+    Q_DISABLE_COPY(QPlatformVulkanInstance)
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(vulkan)
+
+#if defined(Q_CLANG_QDOC)
+/*
+  The following include file did not exist for clang-qdoc running
+  in macOS, but the classes are documented in qvulkanfunctions.cpp.
+  clang-qdoc must parse the class declarations in an include file,
+  or else it can't find a place to put the documentation for the
+  classes. Apparently these classes are created at build time if
+  Vulkan is present.
+ */
+#ifndef QVULKANFUNCTIONS_H
+#define QVULKANFUNCTIONS_H
+
+#include <QtGui/qtguiglobal.h>
+
+#if QT_CONFIG(vulkan) || defined(Q_CLANG_QDOC)
+
+#ifndef VK_NO_PROTOTYPES
+#define VK_NO_PROTOTYPES
+#endif
+#include <vulkan/vulkan.h>
+
+#include <QtCore/qscopedpointer.h>
+
+QT_BEGIN_NAMESPACE
+
+class QVulkanInstance;
+class QVulkanFunctionsPrivate;
+class QVulkanDeviceFunctionsPrivate;
+
+class Q_GUI_EXPORT QVulkanFunctions
+{
+public:
+    ~QVulkanFunctions();
+
+private:
+    Q_DISABLE_COPY(QVulkanFunctions)
+    QVulkanFunctions(QVulkanInstance *inst);
+
+    QScopedPointer<QVulkanFunctionsPrivate> d_ptr;
+    friend class QVulkanInstance;
+};
+
+class Q_GUI_EXPORT QVulkanDeviceFunctions
+{
+public:
+    ~QVulkanDeviceFunctions();
+
+private:
+    Q_DISABLE_COPY(QVulkanDeviceFunctions)
+    QVulkanDeviceFunctions(QVulkanInstance *inst, VkDevice device);
+
+    QScopedPointer<QVulkanDeviceFunctionsPrivate> d_ptr;
+    friend class QVulkanInstance;
+};
+
+QT_END_NAMESPACE
+
+#endif // QT_CONFIG(vulkan) || defined(Q_CLANG_QDOC)
+#endif // QVULKANFUNCTIONS_H;
+#endif // Q_CLANG_QDOC
+
+#endif // QPLATFORMVULKANINSTANCE_H