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diff --git a/src/declarative/scenegraph/util/qsgengine.cpp b/src/declarative/scenegraph/util/qsgengine.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qsgengine.h"
+
+#include <private/qsgtexture_p.h>
+#include <private/qsgrenderer_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class QSGEnginePrivate : public QObjectPrivate
+{
+public:
+    QSGEnginePrivate()
+        : context(0)
+        , clearBeforeRender(true)
+    {
+    }
+
+    QSGContext *context;
+
+    bool clearBeforeRender;
+};
+
+
+/*!
+    \class QSGEngine
+    \brief The QSGEngine class serves as a generic entry point into scene graph specific APIs.
+
+    The QSGEngine class provides factory functions for creating textures. Though the user
+    can implement any type of texture using the abstract QSGTexture class, the QSGEngine
+    class provides some convenience for the default usecases. This also allows the scene
+    graph to apply hardware specific optimzations.
+
+ */
+
+
+
+/*!
+    Constructs a new QSGengine
+ */
+QSGEngine::QSGEngine(QObject *parent) :
+    QObject(*(new QSGEnginePrivate), parent)
+{
+}
+
+
+QSGEngine::~QSGEngine()
+{
+}
+
+/*!
+    \enum TextureOption
+
+    The TextureOption enums are used to customize a texture is wrapped.
+
+    \value TextureHasAlphaChannel The texture has an alpha channel and should
+    be drawn using blending.
+
+    \value TextureHasMipmaps The texture has mipmaps and can be drawn with
+    mipmapping enabled.
+
+    \value TextureOwnsGLTexture The texture object owns the texture id and
+    will delete the GL texture when the texture object is deleted.
+
+ */
+
+/*!
+    \fn void QSGEngine::beforeRendering()
+
+    This signal is emitted before the scene starts rendering.
+
+    Combined with the modes for clearing the background, this option
+    can be used to paint using raw GL under QML content.
+
+    The GL context used for rendering the scene graph will be bound
+    at this point.
+*/
+
+/*!
+    \fn void QSGEngine::afterRendering()
+
+    This signal is emitted after the scene has completed rendering, before swapbuffers is called.
+
+    This signal can be used to paint using raw GL on top of QML content,
+    or to do screen scraping of the current frame buffer.
+
+    The GL context used for rendering the scene graph will be bound at this point.
+ */
+
+
+
+/*!
+    Sets weither the scene graph rendering of QML should clear the color buffer
+    before it starts rendering to \a enbled.
+
+    By disabling clearing of the color buffer, it is possible to do GL painting
+    under the scene graph.
+
+    The color buffer is cleared by default.
+ */
+
+void QSGEngine::setClearBeforeRendering(bool enabled)
+{
+    Q_D(QSGEngine);
+    d->clearBeforeRender = enabled;
+    if (d->clearBeforeRender) {
+        d->context->renderer()->setClearMode(QSGRenderer::ClearDepthBuffer
+                                             | QSGRenderer::ClearColorBuffer);
+    } else {
+        d->context->renderer()->setClearMode(QSGRenderer::ClearDepthBuffer);
+    }
+}
+
+
+
+/*!
+    Returns weither clearing of the color buffer is done before rendering or not.
+ */
+
+bool QSGEngine::clearBeforeRendering() const
+{
+    Q_D(const QSGEngine);
+    return d->clearBeforeRender;
+}
+
+
+
+/*!
+    Creates a new QSGTexture from the supplied \a image. If the image has an
+    alpha channel, the corresponding texture will have an alpha channel.
+
+    The caller of the function is responsible for deleting the returned texture.
+
+    The actual GL texture will be deleted when the texture object is deleted.
+ */
+
+QSGTexture *QSGEngine::createTextureFromImage(const QImage &image) const
+{
+    Q_D(const QSGEngine);
+    return d->context->createTexture(image);
+}
+
+
+
+/*!
+    Creates a new QSGTexture object from an existing GL texture \a id.
+
+    The caller of the function is responsible for deleting the returned texture.
+
+    Use \a options to customize the texture attributes.
+ */
+QSGTexture *QSGEngine::createTextureFromId(uint id, const QSize &size, TextureOptions options) const
+{
+    QSGPlainTexture *texture = new QSGPlainTexture();
+    texture->setTextureId(id);
+    texture->setHasAlphaChannel(options & TextureHasAlphaChannel);
+    texture->setHasMipmaps(options & TextureHasMipmaps);
+    texture->setOwnsTexture(options & TextureOwnsGLTexture);
+    texture->setTextureSize(size);
+    return texture;
+}
+
+
+
+/*!
+    \internal
+
+    Sets the scene graph context of this engine to context.
+
+    The context will be set by the QSGcontext::initialize() function,
+    as part of constructing the engine object.
+ */
+
+void QSGEngine::setContext(QSGContext *context)
+{
+    Q_D(QSGEngine);
+    d->context = context;
+}
+
+
+
+/*!
+    Sets the background color of the scene graph to \a color.
+
+    Changing the clear color has no effect when clearing before rendering is
+    disabled.
+ */
+
+void QSGEngine::setClearColor(const QColor &color)
+{
+    d_func()->context->renderer()->setClearColor(color);
+}
+
+
+
+/*!
+    Returns the background color of the scene graph
+ */
+
+QColor QSGEngine::clearColor() const
+{
+    return d_func()->context->renderer()->clearColor();
+}
+
+QT_END_NAMESPACE