Add QClock to Qt3DAnimation

Clocks are to be used the animation aspect to allow an application to
vary animation clip playback rates.

[ChangeLog][Qt3DAnimation][General] Introduce the QClock frontend and
backend nodes.

Change-Id: Ib73e76800deda07c2fd793d2e3eb3f8a6ee5becb
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

1 files changed, 71 insertions, 0 deletions

diff --git a/src/animation/backend/clock.cpp b/src/animation/backend/clock.cpp
new file mode 100644
index 000000000..870c79078
--- /dev/null
+++ b/src/animation/backend/clock.cpp
@@ -0,0 +1,71 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** 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 "clock_p.h"
+#include <Qt3DAnimation/qclock.h>
+#include <Qt3DAnimation/private/qclock_p.h>
+#include <Qt3DCore/qpropertyupdatedchange.h>
+#include <Qt3DCore/private/qpropertyupdatedchangebase_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3DAnimation {
+namespace Animation {
+
+Clock::Clock()
+    : BackendNode(ReadOnly)
+    , m_startGlobalTime(0)
+    , m_playbackRate(1.f)
+{
+}
+
+void Clock::initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change)
+{
+    const auto typedChange = qSharedPointerCast<Qt3DCore::QNodeCreatedChange<QClockData>>(change);
+    const auto &data = typedChange->data;
+    m_playbackRate = data.playbackRate;
+}
+
+void Clock::cleanup()
+{
+    m_startGlobalTime = 0;
+    m_playbackRate = 1.f;
+}
+
+} // namespace Animation
+} // namespace Qt3DAnimation
+
+QT_END_NAMESPACE