Introduce QAbstractFrameAdvanceService and QTickClockService

This is a first step toward having aspects such as the Renderer aspect provide
a service to drive the QChangeArbiter. This is a step toward having the
QChangeArbiter synched with the vertical refresh rate

Change-Id: Ie4a98e3591e1a9ebb392e1ac4fd3dd1d213538c7
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 86 insertions, 0 deletions

diff --git a/src/core/services/qtickclockservice.cpp b/src/core/services/qtickclockservice.cpp
new file mode 100644
index 000000000..c23c33cb5
--- /dev/null
+++ b/src/core/services/qtickclockservice.cpp
@@ -0,0 +1,86 @@
+/****************************************************************************
+**
+** 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 "qtickclockservice.h"
+#include "qtickclock_p.h"
+#include "qabstractframeadvanceservice_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3D {
+/*!
+    \class Qt3D::QTickClockServicePrivate
+    \internal
+*/
+
+class QTickClockServicePrivate : public QAbstractFrameAdvanceServicePrivate
+{
+public:
+    QTickClockServicePrivate()
+        : QAbstractFrameAdvanceServicePrivate(QStringLiteral("Default Frame Advance Service implementation"))
+    {
+        m_clock.setTickFrequency(60);
+        m_clock.start();
+    }
+
+    QTickClock m_clock;
+};
+
+/*!
+    \class Qt3D::QTickClockService
+    \inmodule Qt3DCore
+    \brief Default Qt3D::QAbstractFrameAdvanceService implementation.
+
+    This default Qt3D::QAbstractFrameAdvanceService implementation has a frequency of 60 Hz.
+*/
+QTickClockService::QTickClockService()
+    : QAbstractFrameAdvanceService(*new QTickClockServicePrivate())
+{
+}
+
+QTickClockService::~QTickClockService()
+{
+}
+
+qint64 QTickClockService::waitForNextFrame()
+{
+    Q_D(QTickClockService);
+    return d->m_clock.waitForNextTick();
+}
+
+} // Qt3D
+
+QT_END_NAMESPACE