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diff --git a/src/quick/scenegraph/qsgrhisupport_p.h b/src/quick/scenegraph/qsgrhisupport_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQuick 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 QSGRHISUPPORT_P_H
+#define QSGRHISUPPORT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qsgrenderloop_p.h"
+#include "qsgrendererinterface.h"
+
+#include <QtGui/private/qrhi_p.h>
+
+#include <QtGui/private/qrhinull_p.h>
+
+#if QT_CONFIG(opengl)
+#include <QtGui/private/qrhigles2_p.h>
+#endif
+
+#if QT_CONFIG(vulkan)
+#include <QtGui/private/qrhivulkan_p.h>
+#endif
+
+#ifdef Q_OS_WIN
+#include <QtGui/private/qrhid3d11_p.h>
+#endif
+
+#ifdef Q_OS_DARWIN
+#include <QtGui/private/qrhimetal_p.h>
+#endif
+
+#if QT_CONFIG(qml_network)
+#define RHI_REMOTE_PROFILER
+#include <QtCore/qelapsedtimer.h>
+#include <QtCore/qscopedpointer.h>
+#include <QtNetwork/qtcpsocket.h>
+#include <QtGui/private/qrhiprofiler_p.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QSGDefaultRenderContext;
+class QVulkanInstance;
+class QOffscreenSurface;
+
+// Opting in/out of QRhi and choosing the default/requested backend is managed
+// by this singleton. This is because this information may be needed before
+// creating a render loop. A well-written render loop sets up its QRhi and
+// related machinery based on the settings queriable from here.
+//
+// cleanup() must be called to perform global (not per thread) cleanup, such
+// as, destroying the QVulkanInstance (if one was created in vulkanInstance()).
+//
+// In addition, the class provides handy conversion and query stuff for the
+// renderloop and the QSGRendererInterface implementations.
+//
+class QSGRhiSupport
+{
+public:
+    static void configure(QSGRendererInterface::GraphicsApi api);
+    static QSGRhiSupport *instance();
+    static QVulkanInstance *vulkanInstance();
+    void cleanup();
+
+    bool isRhiEnabled() const { return m_enableRhi; }
+    QRhi::Implementation rhiBackend() const { return m_rhiBackend; }
+    QSGRendererInterface::GraphicsApi graphicsApi() const;
+
+    bool isDebugLayerRequested() const { return m_debugLayer; }
+    bool isProfilingRequested() const { return m_profile; }
+    bool isShaderEffectDebuggingRequested() const { return m_shaderEffectDebug; }
+    bool isSoftwareRendererRequested() const { return m_preferSoftwareRenderer; }
+
+    QSurface::SurfaceType windowSurfaceType() const;
+
+    const void *rifResource(QSGRendererInterface::Resource res, const QSGDefaultRenderContext *rc);
+
+    int chooseSampleCountForWindowWithRhi(QWindow *window, QRhi *rhi);
+
+    QOffscreenSurface *maybeCreateOffscreenSurface(QWindow *window);
+    QRhi *createRhi(QWindow *window, QOffscreenSurface *offscreenSurface);
+
+    QImage grabAndBlockInCurrentFrame(QRhi *rhi, QRhiSwapChain *swapchain);
+
+    static void checkEnvQSgInfo();
+
+private:
+    QSGRhiSupport();
+    void applySettings();
+    static QSGRhiSupport *staticInst();
+    struct {
+        bool valid = false;
+        QSGRendererInterface::GraphicsApi api;
+        uint rhi : 1;
+    } m_requested;
+    QRhi::Implementation m_rhiBackend = QRhi::Null;
+    int m_killDeviceFrameCount;
+    uint m_set : 1;
+    uint m_enableRhi : 1;
+    uint m_debugLayer : 1;
+    uint m_profile : 1;
+    uint m_shaderEffectDebug : 1;
+    uint m_preferSoftwareRenderer : 1;
+};
+
+// Sends QRhi resource statistics over a QTcpSocket. To be initialized by the
+// renderloop when QSGRhiSupport::isProfilingRequested() is true. Will not do
+// anything unless extra env vars (QSG_RHI_PROFILE_HOST) are set.
+class QSGRhiProfileConnection
+{
+public:
+    static QSGRhiProfileConnection *instance();
+    void initialize(QRhi *rhi);
+    void cleanup();
+    void send(QRhi *rhi);
+
+private:
+#ifdef RHI_REMOTE_PROFILER
+    QScopedPointer<QTcpSocket> m_profConn;
+    QElapsedTimer m_lastMemStatWrite;
+#endif
+};
+
+QT_END_NAMESPACE
+
+#endif // QSGRHISUPPORT_P_H