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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 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 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QMEEGOFENCESYNC_H
#define QMEEGOFENCESYNC_H
#include <QWidget>
class QMeeGoFenceSyncPrivate;
//! A synchronization helper for GL pipeline.
/*!
Fence syncs provide a mechanism for synchronizing access to certain GL primitives
and make it possible for the application developer to be sure that a certain point
in the GL processing pipeline has been already executed before continuing operation.
Currently fence syncs are only useful in conjunction with QMeeGoLivePixmaps.
\code
...
// In your paint/expose event:
QImage *image = livePixmap->lock(&someGlobalFenceSync);
// Modify the image...
livePixmap->release(image);
painter->drawPixmap(0, 0, *livePixmap);
someGlobalFenceSync.setSyncPoint();
...
\endcode
Assuming the paint/expose events come repeatedly, the lock operation
will block till the previous event completed painting the livePixmap.
*/
class Q_DECL_EXPORT QMeeGoFenceSync : public QObject
{
public:
//! Constructs a new fence sync.
/*!
The fence sync is created without a sync point. You need to set the sync point manually.
*/
QMeeGoFenceSync(QWidget *parent = 0);
//! Destructor for the fence sync.
virtual ~QMeeGoFenceSync();
//! Sets the fence sync.
/*!
The fence sync synchronization point should be set after all drawing has been scheduled.
Setting a synchronization point always overrides the previous point -- whetver is was
used (waited upon) or not.
*/
void setSyncPoint();
private:
Q_DISABLE_COPY(QMeeGoFenceSync)
Q_DECLARE_PRIVATE(QMeeGoFenceSync)
protected:
QScopedPointer<QMeeGoFenceSyncPrivate> d_ptr; //! Private bits.
friend class QMeeGoLivePixmap;
};
#endif
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