68 lines
2.1 KiB
Plaintext
68 lines
2.1 KiB
Plaintext
|
/* -*-c++-*- */
|
||
|
|
/* osgEarth - Geospatial SDK for OpenSceneGraph
|
||
|
|
* Copyright 2008-2014 Pelican Mapping
|
||
|
|
* http://osgearth.org
|
||
|
|
*
|
||
|
|
* osgEarth is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>
|
||
|
|
*/
|
||
|
|
#ifndef OSGEARTH_FRAME_CLOCK
|
||
|
|
#define OSGEARTH_FRAME_CLOCK 1
|
||
|
|
|
||
|
|
#include "Common"
|
||
|
|
#include <chrono>
|
||
|
|
#include <atomic>
|
||
|
|
|
||
|
|
namespace osgEarth
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* Frame clock to keep track of time/frames independently of OSG
|
||
|
|
*/
|
||
|
|
class OSGEARTH_EXPORT FrameClock
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
//! New frame clock
|
||
|
|
FrameClock();
|
||
|
|
|
||
|
|
//! Seconds since creation of this object
|
||
|
|
double getTime() const;
|
||
|
|
|
||
|
|
//! Current frame number. This will increment each time a
|
||
|
|
//! cull() and update() pair are called in succession.
|
||
|
|
unsigned getFrame() const;
|
||
|
|
|
||
|
|
//! Register a cull traversal.
|
||
|
|
void cull();
|
||
|
|
|
||
|
|
//! Register an update traversal. If cull() was called before
|
||
|
|
//! the last call to update(), this will increment the frame
|
||
|
|
//! number and return true. Otherwise it returns false, which
|
||
|
|
//! means that update() was already called for this frame and
|
||
|
|
//! the frame number was not incremented.
|
||
|
|
//! (i.e., multiple calls to update in one frame will only
|
||
|
|
//! result in the frame number incrementing once.)
|
||
|
|
bool update();
|
||
|
|
|
||
|
|
private:
|
||
|
|
using Time = std::chrono::time_point<std::chrono::steady_clock>;
|
||
|
|
Time _zero;
|
||
|
|
Time _tick;
|
||
|
|
unsigned _frame;
|
||
|
|
std::atomic_bool _newframe;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace osgEarth
|
||
|
|
|
||
|
|
|
||
|
|
#endif // OSGEARTH_FRAME_CLOCK
|