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/****************************************************************************
**
** Copyright (C) 2015 Paul Lemire
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL3$
** 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 "vsyncframeadvanceservice_p.h"
#include <Qt3DRenderer/private/renderlogging_p.h>
#include <Qt3DCore/private/qabstractframeadvanceservice_p.h>
#include <QSemaphore>
#include <QElapsedTimer>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Render {
class VSyncFrameAdvanceServicePrivate Q_DECL_FINAL : public Qt3DCore::QAbstractFrameAdvanceServicePrivate
{
public:
VSyncFrameAdvanceServicePrivate()
: QAbstractFrameAdvanceServicePrivate(QStringLiteral("Renderer Aspect Frame Advance Service - aligned with vsync"))
, m_semaphore(0)
, m_elapsedTimeSincePreviousFrame(0)
{
}
QSemaphore m_semaphore;
QElapsedTimer m_elapsed;
quint64 m_elapsedTimeSincePreviousFrame;
};
VSyncFrameAdvanceService::VSyncFrameAdvanceService()
: QAbstractFrameAdvanceService(*new VSyncFrameAdvanceServicePrivate())
{
}
VSyncFrameAdvanceService::~VSyncFrameAdvanceService()
{
}
// Aspect Thread
qint64 VSyncFrameAdvanceService::waitForNextFrame()
{
Q_D(VSyncFrameAdvanceService);
d->m_semaphore.acquire(1);
const quint64 currentTime = d->m_elapsed.nsecsElapsed();
qCDebug(VSyncAdvanceService) << "Elapsed nsecs since last call " << currentTime - d->m_elapsedTimeSincePreviousFrame;
d->m_elapsedTimeSincePreviousFrame = currentTime;
return currentTime;
}
void VSyncFrameAdvanceService::start()
{
Q_D(VSyncFrameAdvanceService);
d->m_elapsed.start();
}
/*!
\internal
Stops the VSyncFrameAdvanceService, releases the semaphore to allow the
renderer to cleanup without having to call waitForNextFrame.
*/
void VSyncFrameAdvanceService::stop()
{
Q_D(VSyncFrameAdvanceService);
if (d->m_semaphore.available() == 0)
d->m_semaphore.release(1);
qCDebug(VSyncAdvanceService) << "Terminating VSyncFrameAdvanceService";
}
// Render Thread
void VSyncFrameAdvanceService::proceedToNextFrame()
{
Q_D(VSyncFrameAdvanceService);
d->m_semaphore.release(1);
}
} // namespace Render
} // namespace Qt3DRender
QT_END_NAMESPACE
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