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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*
*/
#ifndef ZVISION_CLOCK_H
#define ZVISION_CLOCK_H
#include "common/types.h"
class OSystem;
namespace ZVision {
/* Class for handling frame to frame deltaTime while keeping track of time pauses/un-pauses */
class Clock {
public:
Clock(OSystem *system);
private:
OSystem *_system;
uint32 _lastTime;
int32 _deltaTime;
uint32 _pausedTime;
bool _paused;
public:
/**
* Updates _deltaTime with the difference between the current time and
* when the last update() was called.
*/
void update();
/**
* Get the delta time since the last frame. (The time between update() calls)
*
* @return Delta time since the last frame (in milliseconds)
*/
uint32 getDeltaTime() const { return _deltaTime; }
/**
* Get the time from the program starting to the last update() call
*
* @return Time from program start to last update() call (in milliseconds)
*/
uint32 getLastMeasuredTime() { return _lastTime; }
/**
* Pause the clock. Any future delta times will take this pause into account.
* Has no effect if the clock is already paused.
*/
void start();
/**
* Un-pause the clock.
* Has no effect if the clock is already un-paused.
*/
void stop();
};
} // End of namespace ZVision
#endif
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