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diff --git a/src/runtimerender/Qt3DSOffscreenRenderKey.h b/src/runtimerender/Qt3DSOffscreenRenderKey.h
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+++ b/src/runtimerender/Qt3DSOffscreenRenderKey.h
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+/****************************************************************************
+**
+** Copyright (C) 2008-2012 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** 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 General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) 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.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-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#pragma once
+#ifndef QT3DS_OFFSCREEN_RENDER_KEY_H
+#define QT3DS_OFFSCREEN_RENDER_KEY_H
+#include "Qt3DSRender.h"
+#include "foundation/StringTable.h"
+#include "foundation/Qt3DSDiscriminatedUnion.h"
+
+namespace qt3ds {
+namespace foundation {
+
+    template <>
+    struct DestructTraits<CRegisteredString>
+    {
+        void destruct(CRegisteredString &) {}
+    };
+}
+}
+
+namespace qt3ds {
+namespace render {
+    struct OffscreenRendererKeyTypes
+    {
+        enum Enum {
+            NoOffscreenRendererKey = 0,
+            RegisteredString,
+            VoidPtr,
+        };
+    };
+
+    template <typename TDType>
+    struct SOffscreenRendererKeyTypeMap
+    {
+    };
+    template <>
+    struct SOffscreenRendererKeyTypeMap<CRegisteredString>
+    {
+        enum { KeyType = OffscreenRendererKeyTypes::RegisteredString };
+    };
+    template <>
+    struct SOffscreenRendererKeyTypeMap<void *>
+    {
+        enum { KeyType = OffscreenRendererKeyTypes::VoidPtr };
+    };
+
+    struct SOffscreenRendererKeyUnionTraits
+    {
+        typedef OffscreenRendererKeyTypes::Enum TIdType;
+        enum {
+            TBufferSize = sizeof(CRegisteredString),
+        };
+
+        static TIdType getNoDataId() { return OffscreenRendererKeyTypes::NoOffscreenRendererKey; }
+
+        template <typename TDataType>
+        static TIdType getType()
+        {
+            return (TIdType)SOffscreenRendererKeyTypeMap<TDataType>::KeyType;
+        }
+
+        template <typename TRetType, typename TVisitorType>
+        static TRetType visit(char *inData, TIdType inType, TVisitorType inVisitor)
+        {
+            switch (inType) {
+            case OffscreenRendererKeyTypes::RegisteredString:
+                return inVisitor(*NVUnionCast<CRegisteredString *>(inData));
+            case OffscreenRendererKeyTypes::VoidPtr:
+                return inVisitor(*NVUnionCast<void **>(inData));
+            default:
+                QT3DS_ASSERT(false);
+            case OffscreenRendererKeyTypes::NoOffscreenRendererKey:
+                return inVisitor();
+            }
+        }
+
+        template <typename TRetType, typename TVisitorType>
+        static TRetType visit(const char *inData, TIdType inType, TVisitorType inVisitor)
+        {
+            switch (inType) {
+            case OffscreenRendererKeyTypes::RegisteredString:
+                return inVisitor(*NVUnionCast<const CRegisteredString *>(inData));
+            case OffscreenRendererKeyTypes::VoidPtr:
+                return inVisitor(*NVUnionCast<const void **>(inData));
+            default:
+                QT3DS_ASSERT(false);
+            case OffscreenRendererKeyTypes::NoOffscreenRendererKey:
+                return inVisitor();
+            }
+        }
+    };
+
+    typedef qt3ds::foundation::
+        DiscriminatedUnion<qt3ds::foundation::
+                               DiscriminatedUnionGenericBase<SOffscreenRendererKeyUnionTraits,
+                                                             SOffscreenRendererKeyUnionTraits::
+                                                                 TBufferSize>,
+                           SOffscreenRendererKeyUnionTraits::TBufferSize>
+            TOffscreenRendererKeyUnionType;
+
+    struct SOffscreenRendererKey : public TOffscreenRendererKeyUnionType
+    {
+        typedef TOffscreenRendererKeyUnionType TBase;
+        SOffscreenRendererKey() {}
+        SOffscreenRendererKey(const CRegisteredString &str)
+            : TBase(str)
+        {
+        }
+        SOffscreenRendererKey(void *key)
+            : TBase(key)
+        {
+        }
+        SOffscreenRendererKey(const SOffscreenRendererKey &other)
+            : TBase(static_cast<const TBase &>(other))
+        {
+        }
+        SOffscreenRendererKey &operator=(const SOffscreenRendererKey &other)
+        {
+            TBase::operator=(other);
+            return *this;
+        }
+    };
+}
+}
+
+#endif