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/****************************************************************************
**
** Copyright (C) 1993-2009 NVIDIA Corporation.
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** 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 https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#pragma once
//==============================================================================
// Includes
//==============================================================================
#include "Qt3DSITimer.h"
//==============================================================================
// Namespace
//==============================================================================
namespace Q3DStudio {
//==============================================================================
// Forwards
//==============================================================================
//==============================================================================
/**
* Time provider interface abstracting time from the usage of time.
*/
class ITimeProvider
{
protected:
virtual ~ITimeProvider() {}
public:
virtual INT64 GetCurrentTimeMicroSeconds() = 0;
};
// Pause in a way that is completely transparent to the underlying system.
class CPausingTimeProvider : public ITimeProvider
{
ITimeProvider &m_Provider;
INT64 m_PauseOffset;
INT64 m_Offset;
bool m_Paused;
public:
CPausingTimeProvider(ITimeProvider &inProvider)
: m_Provider(inProvider)
, m_PauseOffset(0)
, m_Offset(0)
, m_Paused(false)
{
}
INT64 GetCurrentTimeMicroSeconds() override
{
INT64 currentTime = 0;
if (m_Paused)
currentTime = m_PauseOffset;
else
currentTime = m_Provider.GetCurrentTimeMicroSeconds();
return currentTime - m_Offset;
}
void Pause()
{
if (!m_Paused) {
m_Paused = true;
m_PauseOffset = m_Provider.GetCurrentTimeMicroSeconds();
}
}
void UnPause()
{
if (m_Paused) {
m_Paused = false;
INT64 timePaused = m_Provider.GetCurrentTimeMicroSeconds() - m_PauseOffset;
m_Offset += timePaused;
}
}
bool IsPaused() { return m_Paused; }
void Reset() { m_PauseOffset = m_Offset = 0; }
};
//==============================================================================
/**
* @class CTimer
* @brief A very simple platform optimized utility class to return lapsed time
*
* Gets current time based on the time lapsed from the point where timer is started.
*/
class CTimer : public ITimer
{
//==============================================================================
// Fields
//==============================================================================
protected:
ITimeProvider &m_TimeProvider;
INT64 m_StartTime;
BOOL m_IsRunning; // Whether this timer is running or stopped
//==============================================================================
// Methods
//==============================================================================
public: // Construction
CTimer(ITimeProvider &inProvider);
public: // Operation
void Start() override;
void Stop() override;
void Reset() override;
TTimeUnit GetTimeMilliSecs() override;
TMicroSeconds GetTimeMicroSecs() override;
};
} // namespace Q3DStudio
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