Long live QtQuickCL!

Change-Id: I16954f50c631441189dd450980da2c3266a68c71
Reviewed-by: Andy Nichols <andy.nichols@theqtcompany.com>

38 files changed, 3850 insertions, 0 deletions

diff --git a/.qmake.conf b/.qmake.conf
new file mode 100644
index 0000000..ed2d45e
--- /dev/null
+++ b/.qmake.conf
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+load(qt_build_config)
+
+MODULE_VERSION = 5.5.0
+
+CMAKE_MODULE_TESTS = -
diff --git a/LICENSE.GPL b/LICENSE.GPL
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE.GPL
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/LICENSE.LGPLv3 b/LICENSE.LGPLv3
new file mode 100644
index 0000000..8fbb743
--- /dev/null
+++ b/LICENSE.LGPLv3
@@ -0,0 +1,173 @@
+            GNU LESSER GENERAL PUBLIC LICENSE
+
+ The Qt Toolkit is Copyright (C) 2015 The Qt Company Ltd.
+ Contact: http://www.qt.io/licensing/
+
+ You may use, distribute and copy the Qt GUI Toolkit under the terms of
+ GNU Lesser General Public License version 3, which is displayed below.
+
+-------------------------------------------------------------------------
+
+            GNU LESSER GENERAL PUBLIC LICENSE
+                Version 3, 29 June 2007
+
+ Copyright © 2007 Free Software Foundation, Inc. <http://fsf.org/>
+Everyone is permitted to copy and distribute verbatim copies of this
+licensedocument, but changing it is not allowed.
+
+This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+0. Additional Definitions.
+
+ As used herein, “this License” refers to version 3 of the GNU Lesser
+General Public License, and the “GNU GPL” refers to version 3 of the
+GNU General Public License.
+
+ “The Library” refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+ An “Application” is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+ A “Combined Work” is a work produced by combining or linking an
+Application with the Library. The particular version of the Library
+with which the Combined Work was made is also called the “Linked
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+ The “Minimal Corresponding Source” for a Combined Work means the
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+ The “Corresponding Application Code” for a Combined Work means the
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+Application, but excluding the System Libraries of the Combined Work.
+
+1. Exception to Section 3 of the GNU GPL.
+
+ You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+2. Conveying Modified Versions.
+
+ If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+    a) under this License, provided that you make a good faith effort
+    to ensure that, in the event an Application does not supply the
+    function or data, the facility still operates, and performs
+    whatever part of its purpose remains meaningful, or
+
+    b) under the GNU GPL, with none of the additional permissions of
+    this License applicable to that copy.
+
+3. Object Code Incorporating Material from Library Header Files.
+
+ The object code form of an Application may incorporate material from
+a header file that is part of the Library. You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+    a) Give prominent notice with each copy of the object code that
+    the Library is used in it and that the Library and its use are
+    covered by this License.
+
+    b) Accompany the object code with a copy of the GNU GPL and this
+    license document.
+
+4. Combined Works.
+
+ You may convey a Combined Work under terms of your choice that, taken
+together, effectively do not restrict modification of the portions of
+the Library contained in the Combined Work and reverse engineering for
+debugging such modifications, if you also do each of the following:
+
+    a) Give prominent notice with each copy of the Combined Work that
+    the Library is used in it and that the Library and its use are
+    covered by this License.
+
+    b) Accompany the Combined Work with a copy of the GNU GPL and this
+    license document.
+
+    c) For a Combined Work that displays copyright notices during
+    execution, include the copyright notice for the Library among
+    these notices, as well as a reference directing the user to the
+    copies of the GNU GPL and this license document.
+
+    d) Do one of the following:
+
+        0) Convey the Minimal Corresponding Source under the terms of
+        this License, and the Corresponding Application Code in a form
+        suitable for, and under terms that permit, the user to
+        recombine or relink the Application with a modified version of
+        the Linked Version to produce a modified Combined Work, in the
+        manner specified by section 6 of the GNU GPL for conveying
+        Corresponding Source.
+
+        1) Use a suitable shared library mechanism for linking with
+        the Library. A suitable mechanism is one that (a) uses at run
+        time a copy of the Library already present on the user's
+        computer system, and (b) will operate properly with a modified
+        version of the Library that is interface-compatible with the
+        Linked Version.
+
+    e) Provide Installation Information, but only if you would
+    otherwise be required to provide such information under section 6
+    of the GNU GPL, and only to the extent that such information is
+    necessary to install and execute a modified version of the
+    Combined Work produced by recombining or relinking the Application
+    with a modified version of the Linked Version. (If you use option
+    4d0, the Installation Information must accompany the Minimal
+    Corresponding Source and Corresponding Application Code. If you
+    use option 4d1, you must provide the Installation Information in
+    the manner specified by section 6 of the GNU GPL for conveying
+    Corresponding Source.)
+
+5. Combined Libraries.
+
+ You may place library facilities that are a work based on the Library
+side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+    a) Accompany the combined library with a copy of the same work
+    based on the Library, uncombined with any other library
+    facilities, conveyed under the terms of this License.
+
+    b) Give prominent notice with the combined library that part of
+    it is a work based on the Library, and explaining where to find
+    the accompanying uncombined form of the same work.
+
+6. Revised Versions of the GNU Lesser General Public License.
+
+ The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Library
+as you received it specifies that a certain numbered version of the
+GNU Lesser General Public License “or any later version” applies to
+it, you have the option of following the terms and conditions either
+of that published version or of any later version published by the
+Free Software Foundation. If the Library as you received it does not
+specify a version number of the GNU Lesser General Public License,
+you may choose any version of the GNU Lesser General Public License
+ever published by the Free Software Foundation.
+
+If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the Library.
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5cca20d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,77 @@
+QtQuickCL - Write kernels, not boilerplate
+
+QtQuickCL is a research module for Qt 5 that enables easily creating Qt Quick
+items that execute OpenCL kernels and use OpenGL resources as their input or
+output. The functionality is minimal but powerful.
+
+For example, a Qt Quick item executing an OpenCL kernel on a texture provider,
+meaning an Image element or even an entire sub-tree of the Qt Quick scene, and
+rendering the resulting OpenGL texture gets reduced to the following:
+
+    static const char *openclSrc =
+            "__kernel void Kernel(__read_only image2d_t imgIn, __write_only image2d_t imgOut) {\n"
+            ...
+
+    class CLRunnable : public QQuickCLImageRunnable
+    {
+    public:
+        CLRunnable(QQuickCLItem *item)
+            : QQuickCLImageRunnable(item)
+        {
+            m_clProgram = item->buildProgram(openclSrc);
+            m_clKernel = clCreateKernel(m_clProgram, "Kernel", 0);
+        }
+
+        ~CLRunnable() {
+            clReleaseKernel(m_clKernel);
+            clReleaseProgram(m_clProgram);
+        }
+
+        void runKernel(cl_mem inImage, cl_mem outImage, const QSize &size) Q_DECL_OVERRIDE {
+            clSetKernelArg(m_clKernel, 0, sizeof(cl_mem), &inImage);
+            clSetKernelArg(m_clKernel, 1, sizeof(cl_mem), &outImage);
+            const size_t workSize[] = { size_t(size.width()), size_t(size.height()) };
+            clEnqueueNDRangeKernel(commandQueue(), m_clKernel, 2, 0, workSize, 0, 0, 0, 0);
+        }
+
+    private:
+        cl_program m_clProgram;
+        cl_kernel m_clKernel;
+    };
+
+    class CLItem : public QQuickCLItem
+    {
+        Q_OBJECT
+        Q_PROPERTY(QQuickItem *source READ source WRITE setSource)
+
+    public:
+        CLItem() : m_source(0) { }
+
+        QQuickCLRunnable *createCL() Q_DECL_OVERRIDE { return new CLRunnable(this); }
+
+        QQuickItem *source() const { return m_source; }
+        void setSource(QQuickItem *source) { m_source = source; update(); }
+
+    private:
+        QQuickItem *m_source;
+    };
+
+All the CL-GL interop, including the selection of the correct CL platform and
+device, is taken care of by the module. The QQuickCLItem - QQuickCLRunnable
+split ensures easy and safe CL and GL resource management even when threaded
+rendering is in use.
+
+Besides the minimal and lightweight framework, examples are provided for the
+following common use cases:
+
+   * GL texture -> GL texture (image processing, i.e. ShaderEffect but with CL)
+
+   * GL texture -> arbitrary data that gets visualized through Qt Quick
+     (f.ex. histogram)
+
+   * Non-GL data -> GL buffer with vertex data which is used in OpenGL rendering
+     without any additional readbacks or copies (e.g. particle simulation)
+
+The intention for these is not merely to test and demo the classes, but to serve
+as a reference for integrating Qt Quick and OpenCL and to help getting started
+with CL development.
diff --git a/config.tests/opencl/main.cpp b/config.tests/opencl/main.cpp
new file mode 100644
index 0000000..25bf33c
--- /dev/null
+++ b/config.tests/opencl/main.cpp
@@ -0,0 +1,54 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifdef Q_OS_OSX
+#include <OpenCL/opencl.h>
+#else
+#include <CL/opencl.h>
+#endif
+
+int main(int argc, char** argv)
+{
+    cl_uint size;
+    clGetPlatformIDs(0, 0, &size);
+    clCreateImage2D(0, CL_MEM_READ_WRITE, 0, 640, 480, 0, 0, 0);
+
+    cl_gl_object_type objectType = CL_GL_OBJECT_BUFFER;
+    clGetGLObjectInfo(0, &objectType, 0);
+    clEnqueueAcquireGLObjects(0, 0, 0, 0, 0, 0);
+
+    return 0;
+}
diff --git a/config.tests/opencl/opencl.pro b/config.tests/opencl/opencl.pro
new file mode 100644
index 0000000..3a6e9d4
--- /dev/null
+++ b/config.tests/opencl/opencl.pro
@@ -0,0 +1,12 @@
+SOURCES += main.cpp
+CONFIG -= qt
+CONFIG += console
+
+osx {
+    LIBS += -framework OpenCL
+    DEFINES += Q_OS_OSX
+}
+
+unix: !osx: LIBS += -lOpenCL
+
+win32:!winrt:!wince*: LIBS += -lopengl32 -lOpenCL
diff --git a/examples/examples.pro b/examples/examples.pro
new file mode 100644
index 0000000..8ec7ac4
--- /dev/null
+++ b/examples/examples.pro
@@ -0,0 +1,2 @@
+TEMPLATE = subdirs
+SUBDIRS += quickcl
diff --git a/examples/quickcl/histogram/histogram.cl b/examples/quickcl/histogram/histogram.cl
new file mode 100644
index 0000000..de97c2d
--- /dev/null
+++ b/examples/quickcl/histogram/histogram.cl
@@ -0,0 +1,57 @@
+// Based on https://code.google.com/p/opencl-book-samples/source/browse/trunk/src/Chapter_14/histogram
+
+#pragma OPENCL EXTENSION cl_khr_local_int32_base_atomics : enable
+
+constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST;
+
+kernel void histogram(image2d_t img, int num_pixels_per_workitem, global uint *buf)
+{
+    int local_size = get_local_size(0) * get_local_size(1);
+    int item_offset = get_local_id(0) + get_local_id(1) * get_local_size(0);
+    local uint tmp[256];
+
+    int i = 0, j = 256;
+    do {
+        if (item_offset < j)
+            tmp[item_offset + i] = 0;
+        j -= local_size;
+        i += local_size;
+    } while (j > 0);
+
+    barrier(CLK_LOCAL_MEM_FENCE);
+
+    int x, image_width = get_image_width(img), image_height = get_image_height(img);
+    for (i = 0, x = get_global_id(0); i < num_pixels_per_workitem; ++i, x += get_global_size(0)) {
+        if (x < image_width && get_global_id(1) < image_height) {
+            float4 clr = read_imagef(img, sampler, (int2)(x, get_global_id(1)));
+            if (clr.w > 0.99f) {
+                float v = (clr.x + clr.y + clr.z) / 3.0f;
+                atom_inc(&tmp[convert_ushort_sat(min(v, 1.0f) * 255.0f)]);
+            }
+        }
+    }
+
+    barrier(CLK_LOCAL_MEM_FENCE);
+
+    int group_offset = (get_group_id(0) + get_group_id(1) * get_num_groups(0)) * 256;
+    i = 0;
+    j = 256;
+    do {
+        if (item_offset < j)
+            buf[group_offset + item_offset + i] = tmp[item_offset + i];
+        j -= local_size;
+        i += local_size;
+    } while (j > 0);
+}
+
+kernel void sum_histogram(global uint *buf, int num_groups, global uint *result)
+{
+    int idx = get_global_id(0) + get_group_id(0);
+    uint v = 0;
+    int group_offset = 0, n = num_groups;
+    while (--n >= 0) {
+        v += buf[group_offset + idx];
+        group_offset += 256;
+    }
+    result[idx] = v;
+}
diff --git a/examples/quickcl/histogram/histogram.cpp b/examples/quickcl/histogram/histogram.cpp
new file mode 100644
index 0000000..6ba0b65
--- /dev/null
+++ b/examples/quickcl/histogram/histogram.cpp
@@ -0,0 +1,318 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Demonstrates the texture-to-data use case where the results of the
+// computation are exposed to QML and visualized using Qt Quick items.
+
+#include <QGuiApplication>
+#include <QQuickView>
+#include <QQmlEngine>
+#include <QQuickCLItem>
+#include <QQuickCLImageRunnable>
+#include <QAbstractListModel>
+
+static bool profile = false;
+
+class HistogramModel : public QAbstractListModel
+{
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE uint get(int idx) const { return h[idx]; }
+
+    void setHistogram(const QVector<uint> &histogram) {
+        emit beginResetModel();
+        h = histogram;
+        emit endResetModel();
+    }
+
+    int rowCount(const QModelIndex &) const Q_DECL_OVERRIDE {
+        return h.count();
+    }
+
+    QVariant data(const QModelIndex &index, int role) const Q_DECL_OVERRIDE {
+        if (index.isValid() && index.row() < h.count() && role == Qt::UserRole + 1)
+            return h[index.row()];
+        return QVariant();
+    }
+
+    QHash<int, QByteArray> roleNames() const Q_DECL_OVERRIDE {
+        QHash<int, QByteArray> roles;
+        roles[Qt::UserRole + 1] = "value";
+        return roles;
+    }
+
+private:
+    QVector<uint> h;
+};
+
+class CLRunnable;
+
+class CLItem : public QQuickCLItem
+{
+    Q_OBJECT
+    Q_PROPERTY(QQuickItem *source READ source WRITE setSource NOTIFY sourceChanged)
+    Q_PROPERTY(QAbstractItemModel *result READ result NOTIFY resultChanged)
+
+public:
+    CLItem() : m_source(0), m_result(new HistogramModel) { }
+    ~CLItem() { delete m_result; }
+
+    QQuickCLRunnable *createCL() Q_DECL_OVERRIDE;
+    void eventCompleted(cl_event event) Q_DECL_OVERRIDE;
+
+    QQuickItem *source() const { return m_source; }
+    void setSource(QQuickItem *source) {
+        if (m_source != source) {
+            m_source = source;
+            emit sourceChanged();
+            update();
+        }
+    }
+
+    QAbstractItemModel *result() const { return m_result; }
+    void updateResult(const QByteArray &histogram) {
+        const cl_uint *p = (const cl_uint *) histogram.constData();
+        QVector<uint> v(256);
+        for (int i = 0; i < v.count(); ++i)
+            v[i] = p[i];
+        m_result->setHistogram(v);
+        emit newResultsAvailable();
+    }
+
+signals:
+    void sourceChanged();
+    void resultChanged(); // not used as there is a single HistogramModel instance
+    void newResultsAvailable();
+
+private:
+    QQuickItem *m_source;
+    HistogramModel *m_result;
+    CLRunnable *m_runnable;
+};
+
+class CLRunnable : public QQuickCLImageRunnable
+{
+public:
+    CLRunnable(CLItem *item);
+    ~CLRunnable();
+    void runKernel(cl_mem inImage, cl_mem outImage, const QSize &size) Q_DECL_OVERRIDE;
+    QByteArray rawResult() const { return m_result; }
+    void resetPending() { m_resultPending.testAndSetOrdered(1, 0); }
+
+private:
+    CLItem *m_item;
+    cl_program m_program;
+    cl_kernel m_kernel;
+    cl_kernel m_sumKernel;
+    cl_mem m_resultBuf;
+    cl_mem m_sharedBuf;
+    cl_event m_doneEvent;
+    QByteArray m_result;
+    QAtomicInt m_resultPending;
+};
+
+CLRunnable::CLRunnable(CLItem *item)
+    : QQuickCLImageRunnable(item, NoOutputImage | (profile ? Profile : Flag(0))), // note the NoOutputImage flag
+      m_item(item),
+      m_program(0),
+      m_kernel(0),
+      m_sumKernel(0),
+      m_resultBuf(0),
+      m_sharedBuf(0),
+      m_doneEvent(0)
+{
+    QByteArray platform = m_item->platformName();
+    qDebug("Using platform %s", platform.constData());
+    m_program = m_item->buildProgramFromFile(QStringLiteral(":/histogram.cl"));
+    if (!m_program)
+        return;
+    cl_int err;
+    m_kernel = clCreateKernel(m_program, "histogram", &err);
+    if (!m_kernel) {
+        qWarning("Failed to create histogram OpenCL kernel: %d", err);
+        return;
+    }
+    m_sumKernel = clCreateKernel(m_program, "sum_histogram", &err);
+    if (!m_sumKernel) {
+        qWarning("Failed to create sum histogram OpenCL kernel: %d", err);
+        return;
+    }
+    m_resultBuf = clCreateBuffer(m_item->context(), CL_MEM_WRITE_ONLY, 256 * sizeof(cl_uint), 0, &err);
+    if (!m_resultBuf) {
+        qWarning("Failed to create OpenCL buffer: %d", err);
+        return;
+    }
+    m_result.resize(256 * sizeof(cl_uint));
+}
+
+CLRunnable::~CLRunnable()
+{
+    if (m_sharedBuf)
+        clReleaseMemObject(m_sharedBuf);
+    if (m_resultBuf)
+        clReleaseMemObject(m_resultBuf);
+    if (m_kernel)
+        clReleaseKernel(m_kernel);
+    if (m_sumKernel)
+        clReleaseKernel(m_sumKernel);
+    if (m_program)
+        clReleaseProgram(m_program);
+}
+
+class PendingGuard
+{
+public:
+    PendingGuard(CLRunnable *r) : r(r) { }
+    ~PendingGuard() { if (r) r->resetPending(); }
+    void take() { r = 0; }
+private:
+    CLRunnable *r;
+};
+
+#define DIV(a, b) ((a + b - 1) / b)
+
+void CLRunnable::runKernel(cl_mem inImage, cl_mem, const QSize &size)
+{
+    if (!m_program || !m_kernel || !m_sumKernel || !m_resultBuf)
+        return;
+
+    if (!m_resultPending.testAndSetOrdered(0, 1))
+        return;
+    PendingGuard pg(this);
+
+    if (profile)
+        qDebug("CL time: %f ms", elapsed());
+
+    const size_t group_size_x = 16;
+    const size_t group_size_y = 8;
+    const cl_int num_pixels_per_item = 32;
+    const size_t num_items_per_row = DIV(size.width(), num_pixels_per_item);
+    const size_t num_groups_x = DIV(num_items_per_row, group_size_x);
+    const size_t num_groups_y = DIV(size.height(), group_size_y);
+    const cl_int num_groups = cl_int(num_groups_x * num_groups_y);
+
+    const size_t localWorkSize[2] = { group_size_x, group_size_y };
+    const size_t globalWorkSize[2] = { localWorkSize[0] * num_groups_x, localWorkSize[1] * num_groups_y };
+
+    cl_int err;
+    if (!m_sharedBuf) {
+        const size_t sharedBufSize = num_groups * 256 * sizeof(cl_uint);
+        m_sharedBuf = clCreateBuffer(m_item->context(), CL_MEM_READ_WRITE, sharedBufSize, 0, &err);
+        if (!m_sharedBuf) {
+            qWarning("Failed to create shared buffer: %d", err);
+            return;
+        }
+    }
+
+    clSetKernelArg(m_kernel, 0, sizeof(cl_mem), &inImage);
+    clSetKernelArg(m_kernel, 1, sizeof(cl_int), &num_pixels_per_item);
+    clSetKernelArg(m_kernel, 2, sizeof(cl_mem), &m_sharedBuf);
+    err = clEnqueueNDRangeKernel(commandQueue(), m_kernel, 2, 0, globalWorkSize, localWorkSize, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to enqueue kernel: %d", err);
+        return;
+    }
+
+    clSetKernelArg(m_sumKernel, 0, sizeof(cl_mem), &m_sharedBuf);
+    clSetKernelArg(m_sumKernel, 1, sizeof(cl_int), &num_groups);
+    clSetKernelArg(m_sumKernel, 2, sizeof(cl_mem), &m_resultBuf);
+    const size_t sumLocalWorkSize = 256;
+    const size_t sumGlobalWorkSize = 256;
+    err = clEnqueueNDRangeKernel(commandQueue(), m_sumKernel, 1, 0, &sumGlobalWorkSize, &sumLocalWorkSize, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to enqueue sum kernel: %d", err);
+        return;
+    }
+
+    err = clEnqueueReadBuffer(commandQueue(), m_resultBuf, CL_FALSE, 0, m_result.size(), m_result.data(), 0, 0, &m_doneEvent);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to enqueue read buffer: %d", err);
+        return;
+    }
+
+    pg.take();
+    m_item->watchEvent(m_doneEvent);
+}
+
+QQuickCLRunnable *CLItem::createCL()
+{
+    m_runnable = new CLRunnable(this);
+    return m_runnable;
+}
+
+void CLItem::eventCompleted(cl_event event)
+{
+    // We are on the gui thread here.
+    updateResult(m_runnable->rawResult());
+
+    clReleaseEvent(event);
+    m_runnable->resetPending();
+
+    // Request an update, which will eventually also lead to issuing the next
+    // round of computation.
+    scheduleUpdate();
+}
+
+int main(int argc, char **argv)
+{
+#ifdef Q_OS_WIN
+    QCoreApplication::setAttribute(Qt::AA_UseDesktopOpenGL);
+#endif
+    QGuiApplication app(argc, argv);
+
+    if (app.arguments().contains(QStringLiteral("--profile")))
+        profile = true;
+
+    QQuickView view;
+    QObject::connect(view.engine(), SIGNAL(quit()), &app, SLOT(quit()));
+
+    qmlRegisterType<CLItem>("quickcl.qt.io", 1, 0, "CLItem");
+
+    view.setSource(QUrl("qrc:///qml/histogram.qml"));
+    view.setResizeMode(QQuickView::SizeRootObjectToView);
+
+    view.resize(1200, 600);
+    view.show();
+
+    return app.exec();
+}
+
+#include "histogram.moc"
diff --git a/examples/quickcl/histogram/histogram.pro b/examples/quickcl/histogram/histogram.pro
new file mode 100644
index 0000000..f759f6a
--- /dev/null
+++ b/examples/quickcl/histogram/histogram.pro
@@ -0,0 +1,15 @@
+TEMPLATE = app
+
+QT += qml quick quickcl
+
+SOURCES = histogram.cpp
+
+RESOURCES = histogram.qrc
+
+OTHER_FILES = $$PWD/qml/histogram.qml
+
+osx {
+    LIBS += -framework OpenCL
+} else {
+    LIBS += -lOpenCL
+}
diff --git a/examples/quickcl/histogram/histogram.qrc b/examples/quickcl/histogram/histogram.qrc
new file mode 100644
index 0000000..8061a8e
--- /dev/null
+++ b/examples/quickcl/histogram/histogram.qrc
@@ -0,0 +1,8 @@
+<RCC>
+    <qresource prefix="/">
+        <file>qml/histogram.qml</file>
+        <file>qml/image.png</file>
+        <file>qml/qt.png</file>
+        <file>histogram.cl</file>
+    </qresource>
+</RCC>
diff --git a/examples/quickcl/histogram/qml/histogram.qml b/examples/quickcl/histogram/qml/histogram.qml
new file mode 100644
index 0000000..f0fade9
--- /dev/null
+++ b/examples/quickcl/histogram/qml/histogram.qml
@@ -0,0 +1,140 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 1.0
+import quickcl.qt.io 1.0
+
+Item {
+    Rectangle {
+        id: orig
+        width: parent.width / 2 - 4
+        height: parent.height
+        border.color: "magenta"
+        border.width: 4
+
+        Item {
+            id: src
+            anchors.fill: parent
+            layer.enabled: true
+            Image {
+                anchors.fill: parent
+                anchors.margins: 4
+                source: "image.png"
+            }
+            Image {
+                source: "qt.png"
+                width: 100
+                height: 100
+                smooth: true
+                SequentialAnimation on scale {
+                    loops: Animation.Infinite
+                    NumberAnimation { from: 1; to: 8; duration: 2000; easing.type: Easing.OutBounce }
+                    PauseAnimation { duration: 2000 }
+                    NumberAnimation { from: 8; to: 1; duration: 2000; easing.type: Easing.OutBounce }
+                    PauseAnimation { duration: 2000 }
+                }
+                NumberAnimation on rotation { from: 0; to: 360; duration: 2000; loops: Animation.Infinite }
+                anchors.centerIn: parent
+            }
+        }
+    }
+
+    Rectangle {
+        width: parent.width / 2 - 4
+        height: parent.height
+        anchors.left: orig.right
+        anchors.leftMargin: 4
+        border.color: "magenta"
+        border.width: 4
+
+        CLItem {
+            id: clItem
+            source: src
+            anchors.fill: parent
+            anchors.margins: 4
+            onNewResultsAvailable: {
+                var maxValue = rectRoot.height - topText.y - topText.height;
+                for (var i = 0; i < 256; ++i)
+                    rep.itemAt(i).height = Math.max(1, Math.min(result.get(i) / scaleFactor.value, maxValue))
+            }
+            Item {
+                anchors.fill: parent
+                Row {
+                    anchors.fill: parent
+                    id: rectRoot
+                    Repeater {
+                        id: rep
+                        // It might be tempting to use clItem.result as the
+                        // model. This would however result in a serious
+                        // slowdown due to dropping and adding 256 new
+                        // rectangles on every update.
+                        model: 256
+                        Rectangle {
+                            width: parent ? parent.width / rep.count : 0
+                            height: 0
+                            y: parent ? parent.height - height : 0
+                            color: "black"
+                        }
+                    }
+                }
+            }
+        }
+        Text {
+            id: topText
+            font.pointSize: 16
+            text: "Histogram calculated on the GPU with OpenCL (scale: " + Math.round(scaleFactor.value) + ")"
+            color: "green"
+            x: 10
+            y: 10
+        }
+        Slider {
+            id: scaleFactor
+            x: 10
+            anchors.top: topText.bottom
+            anchors.bottom: parent.bottom
+            anchors.margins: 10
+            minimumValue: 1
+            maximumValue: 1024
+            value: 8
+            orientation: Qt.Vertical
+        }
+    }
+}
diff --git a/examples/quickcl/histogram/qml/image.png b/examples/quickcl/histogram/qml/image.png
new file mode 100644
index 0000000..8339210
--- /dev/null
+++ b/examples/quickcl/histogram/qml/image.png
diff --git a/examples/quickcl/histogram/qml/qt.png b/examples/quickcl/histogram/qml/qt.png
new file mode 100644
index 0000000..7d3e97e
--- /dev/null
+++ b/examples/quickcl/histogram/qml/qt.png
diff --git a/examples/quickcl/imageprocess/imageprocess.cpp b/examples/quickcl/imageprocess/imageprocess.cpp
new file mode 100644
index 0000000..9738ea4
--- /dev/null
+++ b/examples/quickcl/imageprocess/imageprocess.cpp
@@ -0,0 +1,187 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Demonstrates the texture-to-texture use case. This is basically an
+// OpenCL-based equivalent to ShaderEffect items.
+
+#include <QGuiApplication>
+#include <QQuickView>
+#include <QQmlEngine>
+#include <QQuickCLItem>
+#include <QQuickCLImageRunnable>
+
+static bool profile = false;
+
+class CLItem : public QQuickCLItem
+{
+    Q_OBJECT
+    Q_PROPERTY(QQuickItem *source READ source WRITE setSource NOTIFY sourceChanged)
+    Q_PROPERTY(qreal factor READ factor WRITE setFactor NOTIFY factorChanged)
+
+public:
+    CLItem() : m_source(0), m_factor(1) { }
+
+    QQuickCLRunnable *createCL() Q_DECL_OVERRIDE;
+
+    QQuickItem *source() const { return m_source; }
+    void setSource(QQuickItem *source) {
+        if (m_source != source) {
+            m_source = source;
+            emit sourceChanged();
+            update();
+        }
+    }
+
+    qreal factor() const { return m_factor; }
+    void setFactor(qreal v) {
+        if (m_factor != v) {
+            m_factor = v;
+            emit factorChanged();
+            update();
+        }
+    }
+
+signals:
+    void sourceChanged();
+    void factorChanged();
+
+private:
+    QQuickItem *m_source;
+    qreal m_factor;
+};
+
+class CLRunnable : public QQuickCLImageRunnable
+{
+public:
+    CLRunnable(CLItem *item);
+    ~CLRunnable();
+    void runKernel(cl_mem inImage, cl_mem outImage, const QSize &size) Q_DECL_OVERRIDE;
+
+private:
+    CLItem *m_item;
+    cl_program m_clProgram;
+    cl_kernel m_clKernel;
+};
+
+QQuickCLRunnable *CLItem::createCL()
+{
+    return new CLRunnable(this);
+}
+
+static const char *openclSrc =
+        "__constant sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE | CLK_ADDRESS_CLAMP_TO_EDGE | CLK_FILTER_NEAREST;\n"
+        "__kernel void Emboss(__read_only image2d_t imgIn, __write_only image2d_t imgOut, float factor) {\n"
+        "    const int2 pos = { get_global_id(0), get_global_id(1) };\n"
+        "    float4 diff = read_imagef(imgIn, sampler, pos + (int2)(1,1)) - read_imagef(imgIn, sampler, pos - (int2)(1,1));\n"
+        "    float color = (diff.x + diff.y + diff.z) / factor + 0.5f;\n"
+        "    write_imagef(imgOut, pos, (float4)(color, color, color, 1.0f));\n"
+        "}\n";
+
+CLRunnable::CLRunnable(CLItem *item)
+    : QQuickCLImageRunnable(item, profile ? Profile : Flag(0)),
+      m_item(item),
+      m_clProgram(0),
+      m_clKernel(0)
+{
+    QByteArray platform = m_item->platformName();
+    qDebug("Using platform %s", platform.constData());
+    m_clProgram = m_item->buildProgram(openclSrc);
+    if (!m_clProgram)
+        return;
+    cl_int err;
+    m_clKernel = clCreateKernel(m_clProgram, "Emboss", &err);
+    if (!m_clKernel) {
+        qWarning("Failed to create emboss OpenCL kernel: %d", err);
+        return;
+    }
+}
+
+CLRunnable::~CLRunnable()
+{
+    if (m_clKernel)
+        clReleaseKernel(m_clKernel);
+    if (m_clProgram)
+        clReleaseProgram(m_clProgram);
+}
+
+void CLRunnable::runKernel(cl_mem inImage, cl_mem outImage, const QSize &size)
+{
+    if (!m_clProgram)
+        return;
+
+    if (profile)
+        qDebug("CL time: %f", elapsed());
+
+    clSetKernelArg(m_clKernel, 0, sizeof(cl_mem), &inImage);
+    clSetKernelArg(m_clKernel, 1, sizeof(cl_mem), &outImage);
+    const cl_float factor = m_item->factor();
+    clSetKernelArg(m_clKernel, 2, sizeof(cl_float), &factor);
+
+    const size_t workSize[] = { size_t(size.width()), size_t(size.height()) };
+    cl_int err = clEnqueueNDRangeKernel(commandQueue(), m_clKernel, 2, 0, workSize, 0, 0, 0, 0);
+    if (err != CL_SUCCESS)
+        qWarning("Failed to enqueue kernel: %d", err);
+}
+
+int main(int argc, char **argv)
+{
+#ifdef Q_OS_WIN
+    QCoreApplication::setAttribute(Qt::AA_UseDesktopOpenGL);
+#endif
+    QGuiApplication app(argc, argv);
+
+    if (app.arguments().contains(QStringLiteral("--profile")))
+        profile = true;
+
+    QQuickView view;
+    QObject::connect(view.engine(), SIGNAL(quit()), &app, SLOT(quit()));
+
+    qmlRegisterType<CLItem>("quickcl.qt.io", 1, 0, "CLItem");
+
+    view.setSource(QUrl("qrc:///qml/imageprocess.qml"));
+    view.setResizeMode(QQuickView::SizeRootObjectToView);
+
+    view.resize(1200, 600);
+    view.show();
+
+    return app.exec();
+}
+
+#include "imageprocess.moc"
diff --git a/examples/quickcl/imageprocess/imageprocess.pro b/examples/quickcl/imageprocess/imageprocess.pro
new file mode 100644
index 0000000..c7825a2
--- /dev/null
+++ b/examples/quickcl/imageprocess/imageprocess.pro
@@ -0,0 +1,15 @@
+TEMPLATE = app
+
+QT += qml quick quickcl
+
+SOURCES = imageprocess.cpp
+
+RESOURCES = imageprocess.qrc
+
+OTHER_FILES = $$PWD/qml/imageprocess.qml
+
+osx {
+    LIBS += -framework OpenCL
+} else {
+    LIBS += -lOpenCL
+}
diff --git a/examples/quickcl/imageprocess/imageprocess.qrc b/examples/quickcl/imageprocess/imageprocess.qrc
new file mode 100644
index 0000000..ecf25e7
--- /dev/null
+++ b/examples/quickcl/imageprocess/imageprocess.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>qml/imageprocess.qml</file>
+        <file>qml/image.png</file>
+    </qresource>
+</RCC>
diff --git a/examples/quickcl/imageprocess/qml/image.png b/examples/quickcl/imageprocess/qml/image.png
new file mode 100644
index 0000000..f8ff553
--- /dev/null
+++ b/examples/quickcl/imageprocess/qml/image.png
diff --git a/examples/quickcl/imageprocess/qml/imageprocess.qml b/examples/quickcl/imageprocess/qml/imageprocess.qml
new file mode 100644
index 0000000..99526ee
--- /dev/null
+++ b/examples/quickcl/imageprocess/qml/imageprocess.qml
@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 1.0
+import quickcl.qt.io 1.0
+
+Item {
+    Rectangle {
+        id: orig
+        width: parent.width / 2 - 4
+        height: parent.height
+        border.color: "magenta"
+        border.width: 4
+
+        Item {
+            id: srcSubTree
+            anchors.fill: parent
+            layer.enabled: true
+            visible: !cbHide.checked
+            Image {
+                id: srcImage
+                anchors.fill: parent
+                anchors.margins: 4
+                source: "image.png"
+            }
+            Rectangle {
+                width: 100
+                height: 100
+                color: "red"
+                NumberAnimation on rotation { from: 0; to: 360; duration: 2000; loops: Animation.Infinite; }
+                anchors.right: parent.right
+                anchors.bottom: parent.bottom
+                anchors.margins: 20
+            }
+            Column {
+                spacing: 10
+                anchors.centerIn: parent
+                CheckBox {
+                    id: cbLayer
+                    text: "Apply to entire sub-tree (FBO)"
+                    checked: false
+                    onCheckedChanged: clItem.source = checked ? srcSubTree : srcImage
+                }
+                CheckBox {
+                    id: cbHide
+                    text: "Hide source"
+                    checked: false
+                    enabled: cbLayer.checked
+                }
+            }
+        }
+        Button {
+            text: "Make visible"
+            visible: cbHide.checked
+            onClicked: cbHide.checked = false
+            anchors.centerIn: parent
+        }
+    }
+
+    Rectangle {
+        width: parent.width / 2 - 4
+        height: parent.height
+        anchors.left: orig.right
+        anchors.leftMargin: 4
+        border.color: "magenta"
+        border.width: 4
+
+        CLItem {
+            id: clItem
+            anchors.fill: parent
+            anchors.margins: 4
+            source: srcImage
+            factor: 1
+            NumberAnimation on factor {
+                from: 1
+                to: 20
+                duration: 8000
+                loops: Animation.Infinite
+            }
+        }
+
+        Text {
+            x: 10
+            y: 10
+            text: "Emboss factor: " + Math.round(clItem.factor) + "\nSource is "
+                  + (clItem.source === srcImage ? "image" : "layered sub-tree")
+            font.pointSize: 16
+            color: "green"
+        }
+    }
+}
diff --git a/examples/quickcl/particles/particles.cl b/examples/quickcl/particles/particles.cl
new file mode 100644
index 0000000..47a8013
--- /dev/null
+++ b/examples/quickcl/particles/particles.cl
@@ -0,0 +1,13 @@
+kernel void updateParticles(global float *buf, float t, float dt, global float *info)
+{
+    int idx = get_global_id(0) * 2;
+    if (t < 0.000001f) {
+        buf[idx] = -1.0f;
+        buf[idx + 1] = -1.0f;
+    } else {
+        float2 dir = (float2)(info[idx], info[idx + 1]);
+        float2 speed = (float2)(info[idx + 2], info[idx + 3]);
+        buf[idx] += dir.x * dt * speed.x;
+        buf[idx + 1] += dir.y * dt * speed.y;
+    }
+}
diff --git a/examples/quickcl/particles/particles.cpp b/examples/quickcl/particles/particles.cpp
new file mode 100644
index 0000000..917baeb
--- /dev/null
+++ b/examples/quickcl/particles/particles.cpp
@@ -0,0 +1,448 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Demonstrates generating vertex data (GL buffer) from OpenCL.
+
+#include <QGuiApplication>
+#include <QQuickView>
+#include <QQmlEngine>
+#include <QSGSimpleTextureNode>
+#include <QOpenGLFramebufferObject>
+#include <QOpenGLFunctions>
+#include <QOpenGLShaderProgram>
+#include <QQuickCLItem>
+#include <QQuickCLRunnable>
+#include <time.h>
+
+const int PARTICLE_COUNT = 1024;
+
+class CLItem;
+
+// CLNode visualizes the results of CLRunnable. This is done by rendering via a
+// FBO since we will have the data (the output from the CL kernel) on the GPU
+// already so QSGGeometryNode and friends are not suitable for us.
+//
+// If mixing with other Quick items is not needed, this can be simplified to
+// render straight to the window in a slot connected directly to the
+// beforeRendering() or afterRendering() signals of the QQuickWindow.
+//
+class CLNode : public QObject, public QSGSimpleTextureNode
+{
+    Q_OBJECT
+
+public:
+    CLNode(CLItem *item) : m_item(item), m_fbo(0), m_buf(0), m_clBuf(0), m_program(0) { }
+
+    ~CLNode() {
+        delete m_program;
+        delete m_fbo;
+        if (m_clBuf)
+            clReleaseMemObject(m_clBuf);
+        QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+        if (m_buf)
+            f->glDeleteBuffers(1, &m_buf);
+    }
+
+public slots:
+    void render();
+
+public:
+    CLItem *m_item;
+    QOpenGLFramebufferObject *m_fbo;
+    GLuint m_buf;
+    cl_mem m_clBuf;
+    QAtomicInt m_renderPending;
+    QOpenGLShaderProgram *m_program;
+    int m_tUniformLoc;
+};
+
+// The CLRunnable lives on the render thread, like the CLNode.
+class CLRunnable : public QObject, public QQuickCLRunnable
+{
+    Q_OBJECT
+
+public:
+    CLRunnable(CLItem *item);
+    ~CLRunnable();
+    QSGNode *update(QSGNode *node) Q_DECL_OVERRIDE;
+    CLNode *node() const { return m_node; }
+    void resetComputeInProgress() { m_computeInProgress.testAndSetOrdered(1, 0); }
+
+public slots:
+    void handleScreenChange();
+
+private:
+    static void CL_CALLBACK computeDoneCallback(cl_event event, cl_int event_command_exec_status, void *user_data);
+    void computeDone();
+    QSize itemSize() const;
+    void createBuffer();
+    void createFbo();
+
+    CLItem *m_item;
+    CLNode *m_node;
+    bool m_recreateFbo;
+    cl_command_queue m_queue;
+    cl_program m_program;
+    cl_kernel m_kernel;
+    cl_event m_computeDoneEvent;
+    QSize m_itemSize;
+    bool m_needsExplicitSync;
+    QAtomicInt m_computeInProgress;
+    qreal m_lastT;
+    cl_mem m_clBufParticleInfo;
+};
+
+class CLItem : public QQuickCLItem
+{
+    Q_OBJECT
+    Q_PROPERTY(qreal t READ t WRITE setT NOTIFY tChanged)
+
+public:
+    CLItem() : m_t(0) { }
+
+    QQuickCLRunnable *createCL() Q_DECL_OVERRIDE;
+    void eventCompleted(cl_event event) Q_DECL_OVERRIDE;
+
+    qreal t() const { return m_t; }
+    void setT(qreal v) {
+        if (m_t != v) {
+            m_t = v;
+            emit tChanged();
+            update();
+        }
+    }
+
+signals:
+    void tChanged();
+
+private:
+    qreal m_t;
+    CLRunnable *m_runnable;
+};
+
+static const char *vertexShaderSource =
+    "attribute vec2 vertex;\n"
+    "void main() {\n"
+    "   gl_PointSize = 4.0;\n"
+    "   gl_Position = vec4(vertex.xy, 0.0, 1.0);\n"
+    "}\n";
+
+static const char *fragmentShaderSource =
+    "uniform highp float t;\n"
+    "void main() {\n"
+    "   gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0 - t);\n"
+    "}\n";
+
+void CLNode::render()
+{
+    if (!m_renderPending.testAndSetOrdered(1, 0))
+        return;
+
+    m_fbo->bind();
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+    QOpenGLFunctions *f = ctx->functions();
+
+    if (!m_program) {
+        m_program = new QOpenGLShaderProgram;
+        m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource);
+        m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource);
+        m_program->link();
+        m_tUniformLoc = m_program->uniformLocation("t");
+
+#ifndef QT_OPENGL_ES_2
+        if (!ctx->isOpenGLES()) {
+            f->glEnable(GL_POINT_SPRITE);
+            f->glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
+        }
+#endif
+    }
+
+    f->glEnable(GL_BLEND);
+    f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+    f->glViewport(0, 0, m_fbo->width(), m_fbo->height());
+    f->glClearColor(0, 0, 0.25f, 1);
+    f->glClear(GL_COLOR_BUFFER_BIT);
+
+    m_program->bind();
+    m_program->setUniformValue(m_tUniformLoc, GLfloat(m_item->t()));
+
+    f->glBindBuffer(GL_ARRAY_BUFFER, m_buf);
+    f->glEnableVertexAttribArray(0);
+    f->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
+
+    f->glDrawArrays(GL_POINTS, 0, PARTICLE_COUNT);
+}
+
+CLRunnable::CLRunnable(CLItem *item)
+    : m_item(item),
+      m_node(0),
+      m_recreateFbo(false),
+      m_program(0),
+      m_kernel(0),
+      m_computeDoneEvent(0),
+      m_lastT(-1),
+      m_clBufParticleInfo(0)
+{
+    qDebug() << "Platform" << m_item->platformName() << "Device extensions" << m_item->deviceExtensions();
+    cl_int err;
+
+    m_queue = clCreateCommandQueue(m_item->context(), m_item->device(), 0, &err);
+    if (!m_queue) {
+        qWarning("Failed to create OpenCL command queue: %d", err);
+        return;
+    }
+
+    m_program = m_item->buildProgramFromFile(QStringLiteral(":/particles.cl"));
+    if (!m_program)
+        return;
+    m_kernel = clCreateKernel(m_program, "updateParticles", &err);
+    if (!m_kernel) {
+        qWarning("Failed to create particles OpenCL kernel: %d", err);
+        return;
+    }
+
+    m_needsExplicitSync = !m_item->deviceExtensions().contains(QByteArrayLiteral("cl_khr_gl_event"));
+
+    // m_clBufParticleInfo is an ordinary OpenCL buffer.
+    size_t velBufSize = PARTICLE_COUNT * sizeof(cl_float) * 4;
+    m_clBufParticleInfo = clCreateBuffer(m_item->context(), CL_MEM_READ_ONLY | CL_MEM_ALLOC_HOST_PTR, velBufSize, 0, &err);
+    if (!m_clBufParticleInfo) {
+        qWarning("Failed to create CL buffer: %d", err);
+        return;
+    }
+    cl_float *ptr = (cl_float *) clEnqueueMapBuffer(m_queue, m_clBufParticleInfo, CL_TRUE, CL_MAP_WRITE, 0, velBufSize, 0, 0, 0, &err);
+    if (!ptr) {
+        qWarning("Failed to map CL buffer: %d", err);
+        return;
+    }
+    cl_float *p = ptr;
+    for (int i = 0; i < PARTICLE_COUNT; ++i) {
+        // Direction
+        *p++ = ((qrand() % 1000) + 1) / 1000.0f;
+        *p++ = ((qrand() % 1000) + 1) / 1000.0f;
+        // Speed
+        *p++ = ((qrand() % 1000) + 1) / 100.0f;
+        *p++ = ((qrand() % 1000) + 1) / 100.0f;
+    }
+    clEnqueueUnmapMemObject(m_queue, m_clBufParticleInfo, ptr, 0, 0, 0);
+}
+
+CLRunnable::~CLRunnable()
+{
+    if (m_clBufParticleInfo)
+        clReleaseMemObject(m_clBufParticleInfo);
+    if (m_kernel)
+        clReleaseKernel(m_kernel);
+    if (m_program)
+        clReleaseProgram(m_program);
+    if (m_queue)
+        clReleaseCommandQueue(m_queue);
+}
+
+void CLRunnable::createBuffer()
+{
+    QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+
+    // m_buf is an OpenGL buffer that is read/written from OpenCL and then used
+    // as the input to the OpenGL vertex shader.
+    GLuint buf;
+    f->glGenBuffers(1, &buf);
+    f->glBindBuffer(GL_ARRAY_BUFFER, buf);
+    f->glBufferData(GL_ARRAY_BUFFER, PARTICLE_COUNT * sizeof(GLfloat) * 2, 0, GL_DYNAMIC_DRAW);
+    if (m_node->m_buf)
+        f->glDeleteBuffers(1, &m_node->m_buf);
+    m_node->m_buf = buf;
+
+    if (m_node->m_clBuf)
+        clReleaseMemObject(m_node->m_clBuf);
+    cl_int err;
+    m_node->m_clBuf = clCreateFromGLBuffer(m_item->context(), CL_MEM_READ_WRITE, buf, &err);
+    if (!m_node->m_clBuf)
+        qWarning("Failed to create OpenCL object for OpenGL buffer: %d", err);
+}
+
+QSize CLRunnable::itemSize() const
+{
+    QSize size(m_item->width(), m_item->height());
+    size *= m_item->window()->effectiveDevicePixelRatio();
+    return size;
+}
+
+void CLRunnable::createFbo()
+{
+    QOpenGLFramebufferObject *fbo = new QOpenGLFramebufferObject(itemSize());
+    m_node->setTexture(m_item->window()->createTextureFromId(fbo->texture(), fbo->size(),
+                                                             QQuickWindow::TextureHasAlphaChannel));
+    delete m_node->m_fbo;
+    m_node->m_fbo = fbo;
+    m_node->m_renderPending.testAndSetOrdered(0, 1);
+}
+
+void CLRunnable::handleScreenChange()
+{
+    // We could have been moved from a high to low dpi screen or vice versa.
+    m_recreateFbo = true;
+    m_item->scheduleUpdate();
+}
+
+class StateGuard
+{
+public:
+    StateGuard(CLRunnable *r) : r(r) { }
+    ~StateGuard() { if (r) r->resetComputeInProgress(); }
+    void release() { r = 0; }
+private:
+    CLRunnable *r;
+};
+
+QSGNode *CLRunnable::update(QSGNode *node)
+{
+    if (!m_queue || !m_program || !m_kernel || !m_clBufParticleInfo)
+        return 0;
+
+    if (!node) {
+        m_node = new CLNode(m_item);
+        m_node->setFiltering(QSGTexture::Linear);
+        QObject::connect(m_item->window(), SIGNAL(beforeRendering()), m_node, SLOT(render()));
+        QObject::connect(m_item->window(), SIGNAL(screenChanged(QScreen*)), this, SLOT(handleScreenChange()));
+        node = m_node;
+        createBuffer();
+    }
+    if (m_itemSize != itemSize()) {
+        m_itemSize = itemSize();
+        m_recreateFbo = true;
+    }
+    if (m_recreateFbo) {
+        m_recreateFbo = false;
+        createFbo();
+    }
+    m_node->setRect(0, 0, m_item->width(), m_item->height());
+    if (m_node->m_renderPending)
+        m_node->markDirty(QSGNode::DirtyMaterial);
+
+    // Animation is based on the time property. No need to enqueue anything if
+    // the value has not yet changed.
+    if (m_lastT == m_item->t())
+        return node;
+
+    if (!m_computeInProgress.testAndSetOrdered(0, 1))
+        return node;
+
+    StateGuard sg(this);
+
+    cl_float dt = m_item->t() - m_lastT;
+    m_lastT = m_item->t();
+
+    if (m_needsExplicitSync)
+        QOpenGLContext::currentContext()->functions()->glFinish();
+
+    cl_int err = clEnqueueAcquireGLObjects(m_queue, 1, &m_node->m_clBuf, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to queue acquiring the GL buffer: %d", err);
+        return node;
+    }
+
+    clSetKernelArg(m_kernel, 0, sizeof(cl_mem), &m_node->m_clBuf);
+    cl_float t = m_item->t();
+    clSetKernelArg(m_kernel, 1, sizeof(cl_float), &t);
+    clSetKernelArg(m_kernel, 2, sizeof(cl_float), &dt);
+    clSetKernelArg(m_kernel, 3, sizeof(cl_mem), &m_clBufParticleInfo);
+    size_t globalWorkSize = PARTICLE_COUNT;
+    err = clEnqueueNDRangeKernel(m_queue, m_kernel, 1, 0, &globalWorkSize, 0, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to enqueue kernel: %d", err);
+        return node;
+    }
+
+    err = clEnqueueReleaseGLObjects(m_queue, 1, &m_node->m_clBuf, 0, 0, &m_computeDoneEvent);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to queue releasing the GL buffer: %d", err);
+        return node;
+    }
+
+    sg.release();
+    m_item->watchEvent(m_computeDoneEvent);
+
+    if (m_needsExplicitSync)
+        clFinish(m_queue);
+
+    return node;
+}
+
+void CLItem::eventCompleted(cl_event event)
+{
+    clReleaseEvent(event);
+    m_runnable->resetComputeInProgress();
+    // Tell the node that the FBO's contents is stale and needs updating.
+    m_runnable->node()->m_renderPending.testAndSetOrdered(0, 1);
+    scheduleUpdate();
+}
+
+QQuickCLRunnable *CLItem::createCL()
+{
+    m_runnable = new CLRunnable(this);
+    return m_runnable;
+}
+
+int main(int argc, char **argv)
+{
+#ifdef Q_OS_WIN
+    QCoreApplication::setAttribute(Qt::AA_UseDesktopOpenGL);
+#endif
+    QGuiApplication app(argc, argv);
+
+    qsrand(time(0));
+
+    QQuickView view;
+    QObject::connect(view.engine(), SIGNAL(quit()), &app, SLOT(quit()));
+
+    qmlRegisterType<CLItem>("quickcl.qt.io", 1, 0, "CLItem");
+
+    view.setSource(QUrl("qrc:///qml/particles.qml"));
+    view.setResizeMode(QQuickView::SizeRootObjectToView);
+
+    view.resize(1200, 600);
+    view.show();
+
+    return app.exec();
+}
+
+#include "particles.moc"
diff --git a/examples/quickcl/particles/particles.pro b/examples/quickcl/particles/particles.pro
new file mode 100644
index 0000000..74050e1
--- /dev/null
+++ b/examples/quickcl/particles/particles.pro
@@ -0,0 +1,15 @@
+TEMPLATE = app
+
+QT += qml quick quickcl
+
+SOURCES = particles.cpp
+
+RESOURCES = particles.qrc
+
+OTHER_FILES = $$PWD/qml/particles.qml
+
+osx {
+    LIBS += -framework OpenCL
+} else {
+    LIBS += -lOpenCL
+}
diff --git a/examples/quickcl/particles/particles.qrc b/examples/quickcl/particles/particles.qrc
new file mode 100644
index 0000000..630169c
--- /dev/null
+++ b/examples/quickcl/particles/particles.qrc
@@ -0,0 +1,6 @@
+<RCC>
+    <qresource prefix="/">
+        <file>qml/particles.qml</file>
+        <file>particles.cl</file>
+    </qresource>
+</RCC>
diff --git a/examples/quickcl/particles/qml/particles.qml b/examples/quickcl/particles/qml/particles.qml
new file mode 100644
index 0000000..9e872e5
--- /dev/null
+++ b/examples/quickcl/particles/qml/particles.qml
@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.0
+import QtQuick.Controls 1.0
+import quickcl.qt.io 1.0
+
+Rectangle {
+    gradient: Gradient {
+        GradientStop { position: 0; color: "steelblue" }
+        GradientStop { position: 1; color: "black" }
+    }
+    Text {
+        text: "Yes, it's a QQuickItem"
+        x: 10
+        y: 10
+        color: "yellow"
+    }
+    CLItem {
+        id: clItem
+        anchors.fill: parent
+        NumberAnimation on t {
+            from: 0.0
+            to: 1.0
+            duration: 10000
+            id: particleAnim
+            running: false
+        }
+        transform: [
+            Rotation { id: rotation; axis.x: 0; axis.z: 0; axis.y: 1; angle: 0; origin.x: width / 2; origin.y: height / 2; },
+            Translate { id: txOut; x: -width / 2; y: -height / 2 },
+            Scale { id: scale; },
+            Translate { id: txIn; x: width / 2; y: height / 2 }
+        ]
+        // animation borrowed from textureinsgnode
+        SequentialAnimation {
+            PauseAnimation { duration: 2000 }
+            ParallelAnimation {
+                NumberAnimation { target: scale; property: "xScale"; to: 0.6; duration: 1000; easing.type: Easing.InOutBack }
+                NumberAnimation { target: scale; property: "yScale"; to: 0.6; duration: 1000; easing.type: Easing.InOutBack }
+            }
+            NumberAnimation { target: rotation; property: "angle"; to: 80; duration: 1000; easing.type: Easing.InOutCubic }
+            NumberAnimation { target: rotation; property: "angle"; to: -80; duration: 1000; easing.type: Easing.InOutCubic }
+            NumberAnimation { target: rotation; property: "angle"; to: 0; duration: 1000; easing.type: Easing.InOutCubic }
+            PauseAnimation { duration: 1000 }
+            ParallelAnimation {
+                NumberAnimation { target: scale; property: "xScale"; to: 1; duration: 1000; easing.type: Easing.InOutBack }
+                NumberAnimation { target: scale; property: "yScale"; to: 1; duration: 1000; easing.type: Easing.InOutBack }
+            }
+            running: true
+            onStarted: particleAnim.restart()
+            onStopped: { particleAnim.restart(); restart() }
+        }
+    }
+    Text {
+        text: "VBO generated from OpenCL"
+        color: "yellow"
+        x: 10
+        y: 10
+        font.pointSize: 16
+        anchors.right: parent.right
+        anchors.margins: 10
+    }
+}
diff --git a/examples/quickcl/quickcl.pro b/examples/quickcl/quickcl.pro
new file mode 100644
index 0000000..f4f79c3
--- /dev/null
+++ b/examples/quickcl/quickcl.pro
@@ -0,0 +1,2 @@
+TEMPLATE = subdirs
+SUBDIRS += imageprocess histogram particles
diff --git a/qtquickcl.pro b/qtquickcl.pro
new file mode 100644
index 0000000..dc54c16
--- /dev/null
+++ b/qtquickcl.pro
@@ -0,0 +1,10 @@
+load(configure)
+
+qtCompileTest(opencl)
+
+load(qt_parts)
+
+!config_opencl {
+    warning("OpenCL not found")
+    SUBDIRS =
+}
diff --git a/src/quickcl/doc/qtquickcl.qdocconf b/src/quickcl/doc/qtquickcl.qdocconf
new file mode 100644
index 0000000..583111c
--- /dev/null
+++ b/src/quickcl/doc/qtquickcl.qdocconf
@@ -0,0 +1,65 @@
+include($QT_INSTALL_DOCS/global/macros.qdocconf)
+include($QT_INSTALL_DOCS/global/qt-cpp-defines.qdocconf)
+include($QT_INSTALL_DOCS/global/compat.qdocconf)
+include($QT_INSTALL_DOCS/global/fileextensions.qdocconf)
+include($QT_INSTALL_DOCS/global/qt-html-templates-offline.qdocconf)
+
+project                                            = QtQuickCL
+description                                        = Qt Quick CL Reference Documentation
+url                                                = http://doc.qt.io/QtQuickCL/
+version                                            = 1.0
+
+qhp.projects                                       = QtQuickCL
+
+qhp.QtQuickCL.file                              = qtquickcl.qhp
+qhp.QtQuickCL.namespace                         = com.qt.quickcl.1.0
+qhp.QtQuickCL.virtualFolder                     = qtquickcl
+qhp.QtQuickCL.indexTitle                        = Qt Quick CL
+qhp.QtQuickCL.indexRoot                         =
+qhp.QtQuickCL.filterAttributes                  = qtquickcl 1.0 qtrefdoc
+qhp.QtQuickCL.customFilters.Qt.name             = QtQuickCL 1.0
+qhp.QtQuickCL.customFilters.Qt.filterAttributes = qtquickcl 1.0
+
+qhp.QtQuickCL.subprojects                       = qmltypes classes examples
+qhp.QtQuickCL.subprojects.qmltypes.title        = QML Types
+qhp.QtQuickCL.subprojects.qmltypes.indexTitle   = Qt Quick CL QML Types
+qhp.QtQuickCL.subprojects.qmltypes.selectors    = fake:qmlclass
+qhp.QtQuickCL.subprojects.qmltypes.sortPages    = true
+qhp.QtQuickCL.subprojects.classes.title         = C++ Classes
+qhp.QtQuickCL.subprojects.classes.indexTitle    = Qt Quick CL C++ Classes
+qhp.QtQuickCL.subprojects.classes.selectors     = class fake:headerfile
+qhp.QtQuickCL.subprojects.classes.sortPages     = true
+qhp.QtQuickCL.subprojects.examples.title        = Examples
+qhp.QtQuickCL.subprojects.examples.indexTitle   = Qt Quick CL Examples
+qhp.QtQuickCL.subprojects.examples.selectors    = fake:example
+
+HTML.footer = \
+    "<div class=\"footer\">\n" \
+    "    <p>\n" \
+    "      <acronym title=\"Copyright\">&copy;</acronym> 2014 Digia. Qt and Qt logos are\n" \
+    "      trademarks of of Digia Corporation in Finland and/or other countries worldwide.\n" \
+    "    </p>\n" \
+    "      All other trademarks are property of their respective owners.\n" \
+    "    <br />\n" \
+    "    <p>\n" \
+    "      Licensees holding valid Qt Enterprise licenses may use this document in accordance\n" \
+    "      with the Qt Enterprise License Agreement provided with the Software or,\n" \
+    "      alternatively, in accordance with the terms contained in a written agreement\n" \
+    "      between you and Digia.\n" \
+    "    </p>\n" \
+    "</div>\n"
+
+indexes +=  $QT_INSTALL_DOCS/qtqml/qtqml.index \
+            $QT_INSTALL_DOCS/qtquick/qtquick.index \
+            $QT_INSTALL_DOCS/qtdoc/qtdoc.index \
+            $QT_INSTALL_DOCS/qtquickcontrols/qtquickcontrols.index
+
+headerdirs += ../
+sourcedirs += ../
+exampledirs += ../../../examples/
+imagedirs  += images
+
+navigation.landingpage    = "Qt Quick CL"
+navigation.qmltypespage   = "Qt Quick CL QML Types"
+navigation.cppclassespage = "Qt Quick CL C++ Classes"
+buildversion              = "Qt Quick CL 1.0"
diff --git a/src/quickcl/qquickclcontext.cpp b/src/quickcl/qquickclcontext.cpp
new file mode 100644
index 0000000..4c07593
--- /dev/null
+++ b/src/quickcl/qquickclcontext.cpp
@@ -0,0 +1,199 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickclcontext_p.h"
+
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLFunctions>
+#include <QtCore/QLoggingCategory>
+#include <qpa/qplatformnativeinterface.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(logCL, "qt.quickcl")
+
+QQuickCLContext::QQuickCLContext()
+    : m_platform(0),
+      m_device(0),
+      m_context(0)
+{
+}
+
+QQuickCLContext::~QQuickCLContext()
+{
+    destroy();
+}
+
+bool QQuickCLContext::create()
+{
+    destroy();
+    qCDebug(logCL, "Creating new OpenCL context");
+
+    QOpenGLContext *ctx = QOpenGLContext::currentContext();
+    if (!ctx) {
+        qWarning("Attempted CL-GL interop without a current OpenGL context");
+        return false;
+    }
+    QOpenGLFunctions *f = ctx->functions();
+
+    cl_uint n;
+    cl_int err = clGetPlatformIDs(0, 0, &n);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to get platform ID count (error %d)", err);
+        if (err == -1001) {
+            qWarning("Could not find OpenCL implementation. ICD missing?"
+#ifdef Q_OS_LINUX
+                     " Check /etc/OpenCL/vendors."
+#endif
+                    );
+        }
+        return false;
+    }
+    if (n == 0) {
+        qWarning("No OpenCL platform found");
+        return false;
+    }
+    QVector<cl_platform_id> platformIds;
+    platformIds.resize(n);
+    if (clGetPlatformIDs(n, platformIds.data(), 0) != CL_SUCCESS) {
+        qWarning("Failed to get platform IDs");
+        return false;
+    }
+    m_platform = platformIds[0];
+    const char *vendor = (const char *) f->glGetString(GL_VENDOR);
+    qCDebug(logCL, "GL_VENDOR: %s", vendor);
+    const bool isNV = vendor && strstr(vendor, "NVIDIA");
+    const bool isIntel = vendor && strstr(vendor, "Intel");
+    const bool isAMD = vendor && strstr(vendor, "ATI");
+    qCDebug(logCL, "Found %u OpenCL platforms:", n);
+    for (cl_uint i = 0; i < n; ++i) {
+        QByteArray name;
+        name.resize(1024);
+        clGetPlatformInfo(platformIds[i], CL_PLATFORM_NAME, name.size(), name.data(), 0);
+        qCDebug(logCL, "Platform %p: %s", platformIds[i], name.constData());
+        if (isNV && name.contains(QByteArrayLiteral("NVIDIA")))
+            m_platform = platformIds[i];
+        else if (isIntel && name.contains(QByteArrayLiteral("Intel")))
+            m_platform = platformIds[i];
+        else if (isAMD && name.contains(QByteArrayLiteral("AMD")))
+            m_platform = platformIds[i];
+    }
+    qCDebug(logCL, "Using platform %p", m_platform);
+
+#if defined (Q_OS_OSX)
+    cl_context_properties contextProps[] = { CL_CONTEXT_PROPERTY_USE_CGL_SHAREGROUP_APPLE,
+                                             (cl_context_properties) CGLGetShareGroup(CGLGetCurrentContext()),
+                                             0 };
+#elif defined(Q_OS_WIN)
+    if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGLES) {
+        // We don't do D3D-CL interop.
+        qWarning("ANGLE is not supported");
+        return false;
+    }
+    cl_context_properties contextProps[] = { CL_CONTEXT_PLATFORM, (cl_context_properties) m_platform,
+                                             CL_GL_CONTEXT_KHR, (cl_context_properties) wglGetCurrentContext(),
+                                             CL_WGL_HDC_KHR, (cl_context_properties) wglGetCurrentDC(),
+                                             0 };
+#elif defined(Q_OS_LINUX)
+    cl_context_properties contextProps[] = { CL_CONTEXT_PLATFORM, (cl_context_properties) m_platform,
+                                             CL_GL_CONTEXT_KHR, 0,
+                                             0, 0,
+                                             0 };
+    QPlatformNativeInterface *nativeIf = qGuiApp->platformNativeInterface();
+    void *dpy = nativeIf->nativeResourceForIntegration(QByteArrayLiteral("egldisplay")); // EGLDisplay
+    if (dpy) {
+        void *nativeContext = nativeIf->nativeResourceForContext("eglcontext", ctx);
+        if (!nativeContext)
+            qWarning("Failed to get the underlying EGL context from the current QOpenGLContext");
+        contextProps[3] = (cl_context_properties) nativeContext;
+        contextProps[4] = CL_EGL_DISPLAY_KHR;
+        contextProps[5] = (cl_context_properties) dpy;
+    } else {
+        dpy = nativeIf->nativeResourceForIntegration(QByteArrayLiteral("display")); // Display *
+        void *nativeContext = nativeIf->nativeResourceForContext("glxcontext", ctx);
+        if (!nativeContext)
+            qWarning("Failed to get the underlying GLX context from the current QOpenGLContext");
+        contextProps[3] = (cl_context_properties) nativeContext;
+        contextProps[4] = CL_GLX_DISPLAY_KHR;
+        contextProps[5] = (cl_context_properties) dpy;
+    }
+#endif
+
+    m_context = clCreateContextFromType(contextProps, CL_DEVICE_TYPE_GPU, 0, 0, &err);
+    if (!m_context) {
+        qWarning("Failed to create OpenCL context: %d", err);
+        return false;
+    }
+    qCDebug(logCL, "Using context %p", m_context);
+
+#if defined(Q_OS_OSX)
+    err = clGetGLContextInfoAPPLE(m_context, CGLGetCurrentContext(),
+                                  CL_CGL_DEVICE_FOR_CURRENT_VIRTUAL_SCREEN_APPLE,
+                                  sizeof(cl_device_id), &m_device, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to get OpenCL device for current screen: %d", err);
+        destroy();
+        return false;
+    }
+#else
+    clGetGLContextInfoKHR_fn getGLContextInfo = (clGetGLContextInfoKHR_fn) clGetExtensionFunctionAddress("clGetGLContextInfoKHR");
+    if (!getGLContextInfo || getGLContextInfo(contextProps, CL_CURRENT_DEVICE_FOR_GL_CONTEXT_KHR,
+                                              sizeof(cl_device_id), &m_device, 0) != CL_SUCCESS) {
+        err = clGetDeviceIDs(m_platform, CL_DEVICE_TYPE_GPU, 1, &m_device, 0);
+        if (err != CL_SUCCESS) {
+            qWarning("Failed to get OpenCL device: %d", err);
+            destroy();
+            return false;
+        }
+    }
+#endif
+    qCDebug(logCL, "Using device %p", m_device);
+
+    return true;
+}
+
+void QQuickCLContext::destroy()
+{
+    if (m_context) {
+        qCDebug(logCL, "Releasing OpenCL context %p", m_context);
+        clReleaseContext(m_context);
+        m_context = 0;
+    }
+    m_device = 0;
+    m_platform = 0;
+}
+
+QT_END_NAMESPACE
diff --git a/src/quickcl/qquickclcontext_p.h b/src/quickcl/qquickclcontext_p.h
new file mode 100644
index 0000000..10bf70d
--- /dev/null
+++ b/src/quickcl/qquickclcontext_p.h
@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKCLCONTEXT_P_H
+#define QQUICKCLCONTEXT_P_H
+
+#include <QtQuickCL/qtquickclglobal.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickCLContext
+{
+public:
+    QQuickCLContext();
+    ~QQuickCLContext();
+
+    bool create();
+    void destroy();
+
+    bool isValid() const { return m_context != 0; }
+
+    cl_platform_id platform() const { return m_platform; }
+    cl_device_id device() const { return m_device; }
+    cl_context context() const { return m_context; }
+
+private:
+    cl_platform_id m_platform;
+    cl_device_id m_device;
+    cl_context m_context;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/quickcl/qquickclimagerunnable.cpp b/src/quickcl/qquickclimagerunnable.cpp
new file mode 100644
index 0000000..01a7be1
--- /dev/null
+++ b/src/quickcl/qquickclimagerunnable.cpp
@@ -0,0 +1,340 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickclimagerunnable.h"
+#include "qquickclitem.h"
+#include <QSGSimpleTextureNode>
+#include <QSGTextureProvider>
+#include <QOpenGLTexture>
+#include <QOpenGLFunctions>
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QQuickCLImageRunnable
+    \brief A QQuickCLItem backend specialized for operating on a single texture from the scenegraph.
+
+    Specialized QQuickCLRunnable for applications wishing to perform
+    OpenCL operations on an OpenCL image object wrapping an OpenGL texture of
+    an Image element - or any other texture provider in the Qt Quick scene -
+    and show the result in the scene.
+
+    The class provides an OpenCL command queue and a simple texture node for
+    the scenegraph. The item providing the texture is read from the associated
+    QQuickCLItem's \c source property by default. This can be overridden by
+    calling setSourcePropertyName().
+
+    By using this specialized class instead of the more generic base
+    QQuickCLRunnable, applications can focus on the kernels and there is no
+    need to manually manage OpenCL image objects, textures, and scenegraph nodes.
+
+    For example, assuming a QQuickCLItem subclass named CLItem, running OpenCL
+    kernels on an image, producing a new output image rendered by CLItem in an
+    accelerated manner without any CPU side readbacks, becomes as simple as the
+    following:
+
+    \badcode
+        Image {
+            id: srcImage
+            source: "image.png"
+        }
+        ...
+        CLItem {
+            source: srcImage
+        }
+    \endcode
+
+    The source can be any texture provider. By enabling layering, the OpenCL
+    kernels can operate on the rendering of an entire sub-tree instead of just
+    a single Image item. In addition, this approach also allows hiding the
+    source sub-tree:
+
+    \badcode
+        Item {
+            id: srcItem
+            layer.enabled: true
+            visible: false
+            ...
+        }
+        CLItem {
+            source: srcItem
+        }
+    \endcode
+
+    Besides image processing scenarios it is also possible to use
+    QQuickCLImageRunnable for computations that produce arbitrary data from an
+    image (for example histogram calculation). Passing the flag NoImageOutput to
+    the constructor will avoid generating an OpenGL texture and corresponding
+    OpenCL image object for the output. Instead, it is up to the runKernel()
+    implementation to emit a signal on the associated QQuickCLItem and pass an
+    object exposing the results of the computation to QML. The visualization is
+    then done by child items since the QQuickCLItem itself does not render
+    anything in the Qt Quick scenegraph in this case, although it is still
+    present as an item having contents.
+ */
+
+/*!
+    \fn void QQuickCLImageRunnable::runKernel(cl_mem inImage, cl_mem outImage, const QSize &size)
+
+    Called when the OpenCL kernel(s) performing the image processing need to be
+    run. \a inImage and \a outImage are ready to be used as input and output
+    \c image2d_t parameters to a kernel. \a size specifies the size of the images.
+
+    \note For QQuickCLImageRunnable instances created with the NoImageOutput
+    flag \a outImage is always \c 0.
+
+    \note QQuickCLImageRunnable is aware of \c cl_khr_gl_event and will invoke
+    glFinish() and clFinish() as necessary in case the extension is not
+    supported. Both will be omitted when the extension is present. However,
+    clFinish() is still invoked regardless of the presence of the extension when
+    either the \c ForceCLFinish or \c Profile flags are set.
+ */
+
+class QQuickCLImageRunnablePrivate
+{
+public:
+    QQuickCLImageRunnablePrivate(QQuickCLItem *item, QQuickCLImageRunnable::Flags flags)
+        : item(item),
+          flags(flags),
+          queue(0),
+          inputTexture(0),
+          outputTexture(0),
+          elapsed(0)
+    {
+        image[0] = image[1] = 0;
+        profEv[0] = profEv[1] = 0;
+        sourcePropertyName = QByteArrayLiteral("source");
+    }
+
+    ~QQuickCLImageRunnablePrivate() {
+        if (image[0])
+            clReleaseMemObject(image[0]);
+        if (image[1])
+            clReleaseMemObject(image[1]);
+        if (queue)
+            clReleaseCommandQueue(queue);
+        delete outputTexture;
+    }
+
+    QQuickCLItem *item;
+    QQuickCLImageRunnable::Flags flags;
+    cl_command_queue queue;
+    cl_mem image[2];
+    QSize textureSize;
+    uint inputTexture;
+    QOpenGLTexture *outputTexture;
+    QByteArray sourcePropertyName;
+    cl_event profEv[2];
+    double elapsed;
+    bool needsExplicitSync;
+};
+
+/*!
+    Constructs a new QQuickCLImageRunnable instance associated with \a item.
+    Special behavior, for example computations producing arbitrary non-image
+    output, can be enabled via \a flags.
+ */
+QQuickCLImageRunnable::QQuickCLImageRunnable(QQuickCLItem *item, Flags flags)
+    : d_ptr(new QQuickCLImageRunnablePrivate(item, flags))
+{
+    Q_D(QQuickCLImageRunnable);
+    cl_int err;
+    cl_command_queue_properties queueProps = flags.testFlag(Profile) ? CL_QUEUE_PROFILING_ENABLE : 0;
+    d->queue = clCreateCommandQueue(item->context(), item->device(), queueProps, &err);
+    if (!d->queue) {
+        qWarning("Failed to create OpenCL command queue: %d", err);
+        return;
+    }
+    d->needsExplicitSync = !item->deviceExtensions().contains(QByteArrayLiteral("cl_khr_gl_event"));
+}
+
+QQuickCLImageRunnable::~QQuickCLImageRunnable()
+{
+    delete d_ptr;
+}
+
+/*!
+    \return the OpenCL command queue.
+ */
+cl_command_queue QQuickCLImageRunnable::commandQueue() const
+{
+    Q_D(const QQuickCLImageRunnable);
+    return d->queue;
+}
+
+/*!
+    Sets the name of the property that is queried from the item that was passed
+    to the constructor. The default value is \c source.
+ */
+void QQuickCLImageRunnable::setSourcePropertyName(const QByteArray &name)
+{
+    Q_D(QQuickCLImageRunnable);
+    d->sourcePropertyName = name;
+}
+
+QSGNode *QQuickCLImageRunnable::update(QSGNode *node)
+{
+    Q_D(QQuickCLImageRunnable);
+    QSGTextureProvider *textureProvider;
+    QSGTexture *texture;
+    QQuickItem *source = d->item->property(d->sourcePropertyName.constData()).value<QQuickItem *>();
+    if (!source
+            || !source->isTextureProvider()
+            || !(textureProvider = source->textureProvider())
+            || !(texture = textureProvider->texture())) {
+        delete node;
+        return 0;
+    }
+
+    QSGDynamicTexture *dtex = qobject_cast<QSGDynamicTexture *>(texture);
+    if (dtex)
+        dtex->updateTexture();
+
+    if (!texture->textureId()) { // the texture provider may not be ready yet, try again later
+        d->item->scheduleUpdate();
+        return node;
+    }
+
+    if (d->inputTexture != uint(texture->textureId())
+            || d->textureSize != texture->textureSize()
+            || (!d->flags.testFlag(NoOutputImage) && !d->outputTexture)) {
+        if (d->image[0])
+            clReleaseMemObject(d->image[0]);
+        d->image[0] = 0;
+        if (d->image[1])
+            clReleaseMemObject(d->image[1]);
+        d->image[1] = 0;
+        delete d->outputTexture;
+        d->outputTexture = 0;
+        delete node;
+        node = 0;
+    }
+
+    cl_int err = 0;
+    if (!d->image[0])
+        d->image[0] = clCreateFromGLTexture2D(d->item->context(), CL_MEM_READ_ONLY, GL_TEXTURE_2D, 0,
+                                              texture->textureId(), &err);
+    if (!d->image[0]) {
+        if (err == CL_INVALID_GL_OBJECT) // the texture provider may not be ready yet, try again later
+            d->item->scheduleUpdate();
+        else
+            qWarning("Failed to create OpenCL image object from input OpenGL texture: %d", err);
+        return node;
+    }
+
+    d->inputTexture = texture->textureId();
+    d->textureSize = texture->textureSize();
+
+    const int imageCount = d->flags.testFlag(NoOutputImage) ? 1 : 2;
+    if (imageCount == 2) {
+        if (!d->outputTexture)
+            d->outputTexture = new QOpenGLTexture(QImage(d->textureSize, QImage::Format_RGB32));
+
+        if (!d->image[1])
+            d->image[1] = clCreateFromGLTexture2D(d->item->context(), CL_MEM_WRITE_ONLY, GL_TEXTURE_2D, 0,
+                                                  d->outputTexture->textureId(), &err);
+        if (!d->image[1]) {
+            qWarning("Failed to create OpenCL image object for output OpenGL texture: %d", err);
+            return node;
+        }
+    }
+
+    if (d->needsExplicitSync)
+        QOpenGLContext::currentContext()->functions()->glFinish();
+
+    err = clEnqueueAcquireGLObjects(d->queue, imageCount, d->image, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to queue acquiring the GL textures: %d", err);
+        return node;
+    }
+
+    if (d->flags.testFlag(Profile))
+        if (clEnqueueMarker(d->queue, &d->profEv[0]) != CL_SUCCESS)
+            qWarning("Failed to enqueue profiling marker (start)");
+
+    runKernel(d->image[0], d->image[1], d->textureSize);
+
+    if (d->flags.testFlag(Profile))
+        if (clEnqueueMarker(d->queue, &d->profEv[1]) != CL_SUCCESS)
+            qWarning("Failed to enqueue profiling marker (end)");
+
+    clEnqueueReleaseGLObjects(d->queue, imageCount, d->image, 0, 0, 0);
+
+    if (d->flags.testFlag(ForceCLFinish) || d->needsExplicitSync || d->flags.testFlag(Profile))
+        clFinish(d->queue);
+
+    if (d->flags.testFlag(Profile)) {
+        cl_ulong start = 0, end = 0;
+        err = clGetEventProfilingInfo(d->profEv[0], CL_PROFILING_COMMAND_QUEUED, sizeof(cl_ulong), &start, 0);
+        if (err != CL_SUCCESS)
+            qWarning("Failed to get profiling info for start event: %d", err);
+        err = clGetEventProfilingInfo(d->profEv[1], CL_PROFILING_COMMAND_END, sizeof(cl_ulong), &end, 0);
+        if (err != CL_SUCCESS)
+            qWarning("Failed to get profiling info for end event: %d", err);
+        d->elapsed = double(end - start) / 1000000.0;
+        clReleaseEvent(d->profEv[0]);
+        clReleaseEvent(d->profEv[1]);
+    }
+
+    if (imageCount == 1)
+        return 0;
+
+    QSGSimpleTextureNode *tnode = static_cast<QSGSimpleTextureNode *>(node);
+    if (!tnode) {
+        tnode = new QSGSimpleTextureNode;
+        tnode->setFiltering(QSGTexture::Linear);
+        tnode->setTexture(d->item->window()->createTextureFromId(d->outputTexture->textureId(), d->textureSize));
+    }
+    tnode->setRect(d->item->boundingRect());
+    tnode->markDirty(QSGNode::DirtyMaterial);
+
+    return tnode;
+}
+
+/*!
+    Returns the number of milliseconds spent on OpenCL operations during the
+    last finished invocation of runKernel().
+
+    \note OpenCL command queue profiling must be enabled by passing the \c Profile
+    flag to the constructor.
+ */
+double QQuickCLImageRunnable::elapsed() const
+{
+    Q_D(const QQuickCLImageRunnable);
+    return d->elapsed;
+}
+
+QT_END_NAMESPACE
diff --git a/src/quickcl/qquickclimagerunnable.h b/src/quickcl/qquickclimagerunnable.h
new file mode 100644
index 0000000..8ca32b0
--- /dev/null
+++ b/src/quickcl/qquickclimagerunnable.h
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKCLIMAGERUNNABLE_H
+#define QQUICKCLIMAGERUNNABLE_H
+
+#include <QtQuickCL/qtquickclglobal.h>
+#include <QtQuickCL/qquickclrunnable.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickCLImageRunnablePrivate;
+class QQuickCLItem;
+
+class Q_QUICKCL_EXPORT QQuickCLImageRunnable : public QQuickCLRunnable
+{
+    Q_DECLARE_PRIVATE(QQuickCLImageRunnable)
+
+public:
+    enum Flag {
+        NoOutputImage = 0x01,
+        Profile = 0x02,
+        ForceCLFinish = 0x04
+    };
+    Q_DECLARE_FLAGS(Flags, Flag)
+
+    QQuickCLImageRunnable(QQuickCLItem *item, Flags flags = 0);
+    ~QQuickCLImageRunnable();
+
+    cl_command_queue commandQueue() const;
+
+    void setSourcePropertyName(const QByteArray &name);
+
+    double elapsed() const;
+
+protected:
+    virtual void runKernel(cl_mem inImage, cl_mem outImage, const QSize &size) = 0;
+
+private:
+    QSGNode *update(QSGNode *node) Q_DECL_OVERRIDE;
+
+    QQuickCLImageRunnablePrivate *d_ptr;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QQuickCLImageRunnable::Flags)
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/quickcl/qquickclitem.cpp b/src/quickcl/qquickclitem.cpp
new file mode 100644
index 0000000..fa5933c
--- /dev/null
+++ b/src/quickcl/qquickclitem.cpp
@@ -0,0 +1,385 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qquickclitem.h"
+#include "qquickclcontext_p.h"
+#include <QtCore/QAtomicInt>
+#include <QtCore/QHash>
+#include <QtCore/QFile>
+#include <QtCore/QLoggingCategory>
+#include <QtQuick/private/qquickitem_p.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(logCL)
+
+/*!
+    \class QQuickCLItem
+
+    \brief QQuickCLItem is a QQuickItem that automatically gets an OpenCL
+    context with the proper platform and device chosen for CL-GL interop.
+
+    Each instance of QQuickCLItem is backed by a corresponding QQuickCLRunnable.
+
+     \note When animating properties that are used in OpenCL kernels, call the
+     \l{QQuickItem::update()}{update()} function (from the gui thread) to
+     trigger updates.
+ */
+
+/*!
+    \class QQuickCLRunnable
+
+    \brief QQuickCLRunnable instances live on the scenegraph's render thread
+    encapsulating OpenCL and related OpenGL resources.
+
+    The constructor, destructor and update() are always invoked on the render
+    thread with the OpenGL context bound and the OpenCL context ready. This
+    allows easy usage of OpenCL and especially OpenGL resources without
+    worrying about lifetime and threading. They can simply be created in the
+    constructor and released in the destructor.
+ */
+
+/*!
+    \fn QSGNode *QQuickCLRunnable::update(QSGNode *node)
+
+    Called on the render thread every time the QQuickCLItem is updated.
+    Semantically equivalent to
+    \l{QQuickItem::updatePaintNode()}{updatePaintNode()}.
+
+    It is up to the implementation to decide what to do here: it can launch
+    OpenCL operations, wait for them to finish, and return a scenegraph node,
+    for example a QSGSimpleTextureNode wrapping the resulting texture.
+
+    Alternatively, it can also launch a longer running CL operation and return
+    \c null or a node providing some temporary content. Then, when the CL
+    operation is finished, \l{QQuickCLItem::scheduleUpdate()}{scheduleUpdate()}
+    is called from an OpenCL event callback to schedule an update for the Quick
+    item, which means eventually invoking this function again. This function
+    can then provide a new node with the results of the computation.
+
+    \note When necessary, future updates for the QQuickCLItem can also be
+    scheduled from this function. However, this requires calling
+    QQuickCLItem::scheduleUpdate() instead of QQuickItem::update().
+ */
+
+/*!
+    \fn QQuickCLRunnable *QQuickCLItem::createCL()
+
+    Factory function invoked on the render thread after initializing OpenCL.
+ */
+
+class QQuickCLItemPrivate : public QQuickItemPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickCLItem)
+
+public:
+    QQuickCLItemPrivate() : clctx(0), clnode(0) { }
+
+    static void CL_CALLBACK eventCallback(cl_event event, cl_int status, void *user_data);
+
+    QQuickCLContext *clctx;
+    QQuickCLRunnable *clnode;
+};
+
+QQuickCLItem::QQuickCLItem(QQuickItem *parent)
+    : QQuickItem(*new QQuickCLItemPrivate, parent)
+{
+    setFlag(ItemHasContents);
+}
+
+/*!
+  \return the selected OpenCL platform. Matches the OpenGL context in use.
+
+  \note The value is only available after the item is first rendered. It is
+  always safe to call this function from QQuickCLRunnable's constructor,
+  destructor and \l{QQuickCLRunnable::update()}{update()} function.
+ */
+cl_platform_id QQuickCLItem::platform() const
+{
+    Q_D(const QQuickCLItem);
+    return d->clctx ? d->clctx->platform() : 0;
+}
+
+/*!
+  \return the selected OpenCL device. Matches the OpenGL context in use.
+
+  \note The value is only available after the item is first rendered. It is
+  always safe to call this function from QQuickCLRunnable's constructor,
+  destructor and \l{QQuickCLRunnable::update()}{update()} function.
+ */
+cl_device_id QQuickCLItem::device() const
+{
+    Q_D(const QQuickCLItem);
+    return d->clctx ? d->clctx->device() : 0;
+}
+
+/*!
+  \return the OpenCL context.
+
+  \note The value is only available after the item is first rendered. It is
+  always safe to call this function from QQuickCLRunnable's constructor,
+  destructor and \l{QQuickCLRunnable::update()}{update()} function.
+ */
+cl_context QQuickCLItem::context() const
+{
+    Q_D(const QQuickCLItem);
+    return d->clctx ? d->clctx->context() : 0;
+}
+
+QSGNode *QQuickCLItem::updatePaintNode(QSGNode *node, UpdatePaintNodeData *)
+{
+    Q_D(QQuickCLItem);
+
+    if (width() <= 0 || height() <= 0) {
+        delete node;
+        return 0;
+    }
+
+    // render thread, initialize CL if not yet done
+    if (!d->clctx) {
+        d->clctx = new QQuickCLContext;
+        if (!d->clctx->create()) {
+            qWarning("Failed to create OpenCL context");
+            delete d->clctx;
+            d->clctx = 0;
+        }
+    }
+
+    if (!d->clctx)
+        return 0;
+
+    if (!d->clnode)
+        d->clnode = createCL();
+
+    return d->clnode ? d->clnode->update(node) : 0;
+}
+
+class ReleaseRunnable : public QRunnable
+{
+public:
+    ReleaseRunnable(QQuickCLContext *clctx, QQuickCLRunnable *clnode) : clctx(clctx), clnode(clnode) { }
+    void run() Q_DECL_OVERRIDE {
+        delete clnode;
+        delete clctx;
+    }
+private:
+    QQuickCLContext *clctx;
+    QQuickCLRunnable *clnode;
+};
+
+void QQuickCLItem::releaseResources()
+{
+    // gui thread, just schedule. NB this and d may be dead by the time the runnable is run
+    Q_D(QQuickCLItem);
+    window()->scheduleRenderJob(new ReleaseRunnable(d->clctx, d->clnode), QQuickWindow::BeforeSynchronizingStage);
+    d->clnode = 0;
+    d->clctx = 0;
+}
+
+void QQuickCLItem::invalidateSceneGraph()
+{
+    // render thread
+    Q_D(QQuickCLItem);
+    delete d->clnode;
+    d->clnode = 0;
+    delete d->clctx;
+    d->clctx = 0;
+}
+
+static const int EV_UPDATE = QEvent::User + 128;
+static const int EV_EVENT = QEvent::User + 129;
+
+class EventCompleteEvent : public QEvent
+{
+public:
+    EventCompleteEvent(cl_event event) : QEvent(QEvent::Type(EV_EVENT)), event(event) { }
+    cl_event event;
+};
+
+bool QQuickCLItem::event(QEvent *e)
+{
+    if (e->type() == EV_UPDATE) {
+        update();
+        return true;
+    } else if (e->type() == EV_EVENT) {
+        EventCompleteEvent *ev = static_cast<EventCompleteEvent *>(e);
+        eventCompleted(ev->event);
+        return true;
+    }
+    return QQuickItem::event(e);
+}
+
+/*!
+    Schedules an update for the item. Unlike \l{QQuickItem::update()}{the base
+    class' update()}, this is safe to be called on any thread, hence it is safe
+    for use from CL event callbacks.
+ */
+void QQuickCLItem::scheduleUpdate()
+{
+    QCoreApplication::postEvent(this, new QEvent(QEvent::Type(EV_UPDATE)));
+}
+
+/*!
+    \return the name of the current platform in use.
+
+    \note This function can only be called from a QQuickCLRunnable's
+    constructor, destructor and \l{QQuickCLRunnable::update()}{update()}
+    function, or after the item has been rendered at least once.
+ */
+QByteArray QQuickCLItem::platformName() const
+{
+    QByteArray name(1024, '\0');
+    clGetPlatformInfo(platform(), CL_PLATFORM_NAME, name.size(), name.data(), 0);
+    name.resize(int(strlen(name.constData())));
+    return name;
+}
+
+/*!
+    \return the list of device extensions.
+
+    \note This function can only be called from a QQuickCLRunnable's
+    constructor, destructor and \l{QQuickCLRunnable::update()}{update()}
+    function, or after the item has been rendered at least once.
+ */
+QByteArray QQuickCLItem::deviceExtensions() const
+{
+    QByteArray ext(8192, '\0');
+    clGetDeviceInfo(device(), CL_DEVICE_EXTENSIONS, ext.size(), ext.data(), 0);
+    ext.resize(int(strlen(ext.constData())));
+    return ext;
+}
+
+/*!
+    Creates and builds an OpenCL program from the source code in \a src.
+
+    \return the cl_program or \c 0 when failed. Errors and build logs are
+    printed to the warning output.
+
+    \note This function can only be called from a QQuickCLRunnable's
+    constructor, destructor and \l{QQuickCLRunnable::update()}{update()}
+    function, or after the item has been rendered at least once.
+ */
+cl_program QQuickCLItem::buildProgram(const QByteArray &src)
+{
+    cl_int err;
+    const char *str = src.constData();
+    cl_program prog = clCreateProgramWithSource(context(), 1, &str, 0, &err);
+    if (!prog) {
+        qWarning("Failed to create OpenCL program: %d", err);
+        qWarning("Source was:\n%s", str);
+        return 0;
+    }
+    cl_device_id dev = device();
+    err = clBuildProgram(prog, 1, &dev, 0, 0, 0);
+    if (err != CL_SUCCESS) {
+        qWarning("Failed to build OpenCL program: %d", err);
+        qWarning("Source was:\n%s", str);
+        QByteArray log;
+        log.resize(8192);
+        clGetProgramBuildInfo(prog, dev, CL_PROGRAM_BUILD_LOG, log.size(), log.data(), 0);
+        qWarning("Build log:\n%s", log.constData());
+        return 0;
+    }
+    return prog;
+}
+
+/*!
+    Creates and builds an OpenCL program from the source file \a filename.
+
+    \sa buildProgram()
+ */
+cl_program QQuickCLItem::buildProgramFromFile(const QString &filename)
+{
+    QFile f(filename);
+    if (!f.open(QIODevice::ReadOnly | QIODevice::Text)) {
+        qWarning("Failed to open OpenCL program source file %s", qPrintable(filename));
+        return 0;
+    }
+    return buildProgram(f.readAll());
+}
+
+struct EventCallbackParam
+{
+    EventCallbackParam(QQuickCLItem *item) : item(item) { }
+    QPointer<QQuickCLItem> item;
+};
+
+/*!
+    Registers an event callback for \a event. The virtual function
+    eventCompleted() will get invoked on the gui/main thread when the event
+    completes.
+
+    This allows easy and safe asynchronous computations because the results can
+    directly be exposed to QML from eventCompleted() due to it running on the
+    gui/main thread. In addition it is guaranteed that eventCompleted() is
+    never called directly from the OpenCL callback function. Special cases like
+    destroying the QQuickCLItem before completing the event are also handled
+    gracefully.
+
+    \note \a event is not released.
+ */
+void QQuickCLItem::watchEvent(cl_event event)
+{
+    EventCallbackParam *param = new EventCallbackParam(this);
+    cl_int err = clSetEventCallback(event, CL_COMPLETE, QQuickCLItemPrivate::eventCallback, param);
+    if (err != CL_SUCCESS)
+        qWarning("Failed to set event callback: %d", err);
+}
+
+/*!
+    Called on the gui/main thread when the \a event watched via watchEvent()
+    completes. The default implementation does nothing.
+ */
+void QQuickCLItem::eventCompleted(cl_event event)
+{
+    Q_UNUSED(event);
+}
+
+void CL_CALLBACK QQuickCLItemPrivate::eventCallback(cl_event event, cl_int status, void *user_data)
+{
+    if (status != CL_COMPLETE)
+        return;
+    EventCallbackParam *param = static_cast<EventCallbackParam *>(user_data);
+    if (!param->item.isNull())
+        QCoreApplication::postEvent(param->item, new EventCompleteEvent(event));
+    delete param;
+}
+
+QQuickCLRunnable::~QQuickCLRunnable()
+{
+}
+
+QT_END_NAMESPACE
diff --git a/src/quickcl/qquickclitem.h b/src/quickcl/qquickclitem.h
new file mode 100644
index 0000000..98ce7fc
--- /dev/null
+++ b/src/quickcl/qquickclitem.h
@@ -0,0 +1,84 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKCLITEM_H
+#define QQUICKCLITEM_H
+
+#include <QtQuickCL/qtquickclglobal.h>
+#include <QtQuickCL/qquickclrunnable.h>
+#include <QtQuick/qquickitem.h>
+
+QT_BEGIN_NAMESPACE
+
+class QQuickCLItemPrivate;
+
+class Q_QUICKCL_EXPORT QQuickCLItem : public QQuickItem
+{
+    Q_OBJECT
+    Q_DECLARE_PRIVATE(QQuickCLItem)
+
+public:
+    QQuickCLItem(QQuickItem *parent = 0);
+
+    cl_platform_id platform() const;
+    cl_device_id device() const;
+    cl_context context() const;
+
+    void scheduleUpdate();
+
+    QByteArray platformName() const;
+    QByteArray deviceExtensions() const;
+    cl_program buildProgram(const QByteArray &src);
+    cl_program buildProgramFromFile(const QString &filename);
+
+    void watchEvent(cl_event event);
+    virtual void eventCompleted(cl_event event);
+
+protected:
+    virtual QQuickCLRunnable *createCL() = 0;
+
+private slots:
+    void invalidateSceneGraph(); // called by QQuickWindow, must be a slot
+
+private:
+    QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *) Q_DECL_OVERRIDE;
+    void releaseResources() Q_DECL_OVERRIDE;
+    bool event(QEvent *) Q_DECL_OVERRIDE;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/quickcl/qquickclrunnable.h b/src/quickcl/qquickclrunnable.h
new file mode 100644
index 0000000..3086afd
--- /dev/null
+++ b/src/quickcl/qquickclrunnable.h
@@ -0,0 +1,54 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QQUICKCLRUNNABLE_H
+#define QQUICKCLRUNNABLE_H
+
+#include <QtQuickCL/qtquickclglobal.h>
+#include <QtQuick/qsgnode.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_QUICKCL_EXPORT QQuickCLRunnable
+{
+public:
+    virtual ~QQuickCLRunnable();
+    virtual QSGNode *update(QSGNode *node) = 0;
+};
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/quickcl/qtquickclglobal.h b/src/quickcl/qtquickclglobal.h
new file mode 100644
index 0000000..1e459eb
--- /dev/null
+++ b/src/quickcl/qtquickclglobal.h
@@ -0,0 +1,65 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick CL module
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** 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 http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://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.LGPLv3 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.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 later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QTQUICKCLGLOBAL_H
+#define QTQUICKCLGLOBAL_H
+
+#include <QtCore/qglobal.h>
+
+#ifdef Q_OS_OSX
+#include <OpenCL/opencl.h>
+#include <OpenGL/OpenGL.h>
+#else
+#include <CL/opencl.h>
+#endif
+
+QT_BEGIN_NAMESPACE
+
+#ifndef Q_QUICKCL_EXPORT
+#  ifndef QT_STATIC
+#    if defined(QT_BUILD_QUICKCL_LIB)
+#      define Q_QUICKCL_EXPORT Q_DECL_EXPORT
+#    else
+#      define Q_QUICKCL_EXPORT Q_DECL_IMPORT
+#    endif
+#  else
+#    define Q_QUICKCL_EXPORT
+#  endif
+#endif
+
+QT_END_NAMESPACE
+
+#endif
diff --git a/src/quickcl/quickcl.pro b/src/quickcl/quickcl.pro
new file mode 100644
index 0000000..2a28924
--- /dev/null
+++ b/src/quickcl/quickcl.pro
@@ -0,0 +1,24 @@
+TARGET     = QtQuickCL
+QT         = core core-private gui gui-private qml-private quick quick-private
+
+load(qt_module)
+
+DEFINES += QT_BUILD_QUICKCL_LIB
+
+HEADERS = \
+    qtquickclglobal.h \
+    qquickclcontext_p.h \
+    qquickclitem.h \
+    qquickclrunnable.h \
+    qquickclimagerunnable.h
+
+SOURCES = \
+    qquickclcontext.cpp \
+    qquickclitem.cpp \
+    qquickclimagerunnable.cpp
+
+QMAKE_DOCS = $$PWD/doc/qtquickcl.qdocconf
+
+osx: LIBS += -framework OpenCL
+unix: !osx: LIBS += -lOpenCL
+win32: !winrt: !wince*: LIBS += -lopengl32 -lOpenCL
diff --git a/src/src.pro b/src/src.pro
new file mode 100644
index 0000000..108b2c0
--- /dev/null
+++ b/src/src.pro
@@ -0,0 +1,3 @@
+TEMPLATE = subdirs
+SUBDIRS += \
+    quickcl
diff --git a/sync.profile b/sync.profile
new file mode 100644
index 0000000..92710c9
--- /dev/null
+++ b/sync.profile
@@ -0,0 +1,15 @@
+%modules = ( # path to module name map
+    "QtQuickCL" => "$basedir/src/quickcl",
+);
+%moduleheaders = ( # restrict the module headers to those found in relative path
+);
+# Module dependencies.
+# Every module that is required to build this module should have one entry.
+# Each of the module version specifiers can take one of the following values:
+#   - A specific Git revision.
+#   - any git symbolic ref resolvable from the module's repository (e.g. "refs/heads/master" to track master branch)
+#
+%dependencies = (
+    "qtbase" => "refs/heads/master",
+    "qtdeclarative" => "refs/heads/master",
+);