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/****************************************************************************
**
** 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>
#include <QQuickCLContext>
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)
{
QQuickCLContext *clctx = m_item->context();
QByteArray platform = clctx->platformName();
qDebug("Using platform %s", platform.constData());
m_clProgram = clctx->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"
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