116 lines
3.7 KiB
C
116 lines
3.7 KiB
C
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
//
|
||
|
|
// Copyright (c) 2006, Industrial Light & Magic, a division of Lucas
|
||
|
|
// Digital Ltd. LLC
|
||
|
|
//
|
||
|
|
// All rights reserved.
|
||
|
|
//
|
||
|
|
// Redistribution and use in source and binary forms, with or without
|
||
|
|
// modification, are permitted provided that the following conditions are
|
||
|
|
// met:
|
||
|
|
// * Redistributions of source code must retain the above copyright
|
||
|
|
// notice, this list of conditions and the following disclaimer.
|
||
|
|
// * Redistributions in binary form must reproduce the above
|
||
|
|
// copyright notice, this list of conditions and the following disclaimer
|
||
|
|
// in the documentation and/or other materials provided with the
|
||
|
|
// distribution.
|
||
|
|
// * Neither the name of Industrial Light & Magic nor the names of
|
||
|
|
// its contributors may be used to endorse or promote products derived
|
||
|
|
// from this software without specific prior written permission.
|
||
|
|
//
|
||
|
|
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||
|
|
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||
|
|
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
|
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
//
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
#ifndef INCLUDED_TIMER_H
|
||
|
|
#define INCLUDED_TIMER_H
|
||
|
|
|
||
|
|
//----------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Timing control for the display thread of the playExr prgram
|
||
|
|
//
|
||
|
|
//----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
#ifdef _WIN32
|
||
|
|
#include <windows.h>
|
||
|
|
#else
|
||
|
|
#include <sys/time.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
enum PlayState
|
||
|
|
{
|
||
|
|
PREPARE_TO_RUN,
|
||
|
|
RUNNING,
|
||
|
|
PREPARE_TO_PAUSE,
|
||
|
|
PAUSE,
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
class Timer
|
||
|
|
{
|
||
|
|
public:
|
||
|
|
|
||
|
|
//------------
|
||
|
|
// Constructor
|
||
|
|
//------------
|
||
|
|
|
||
|
|
Timer ();
|
||
|
|
|
||
|
|
|
||
|
|
//--------------------------------------------------------
|
||
|
|
// Timing control to maintain the desired frame rate:
|
||
|
|
// the redrawWindow() function in the display thread calls
|
||
|
|
// waitUntilNextFrameIsDue() before displaying each frame.
|
||
|
|
//
|
||
|
|
// If playState == RUNNING, then waitUntilNextFrameIsDue()
|
||
|
|
// sleeps until the apropriate amount of time has elapsed
|
||
|
|
// since the last call to waitUntilNextFrameIsDue().
|
||
|
|
// If playState != RUNNING, then waitUntilNextFrameIsDue()
|
||
|
|
// returns immediately.
|
||
|
|
//--------------------------------------------------------
|
||
|
|
|
||
|
|
void waitUntilNextFrameIsDue ();
|
||
|
|
|
||
|
|
|
||
|
|
//-------------------------------------------------
|
||
|
|
// Set and get the frame rate, in frames per second
|
||
|
|
//-------------------------------------------------
|
||
|
|
|
||
|
|
void setDesiredFrameRate (float fps);
|
||
|
|
float actualFrameRate ();
|
||
|
|
|
||
|
|
|
||
|
|
//-------------------
|
||
|
|
// Current play state
|
||
|
|
//-------------------
|
||
|
|
|
||
|
|
PlayState playState;
|
||
|
|
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
float _spf; // desired frame rate,
|
||
|
|
// in seconds per frame
|
||
|
|
|
||
|
|
timeval _lastFrameTime; // time when we displayed the
|
||
|
|
// last frame
|
||
|
|
|
||
|
|
float _timingError; // cumulative timing error
|
||
|
|
|
||
|
|
timeval _lastFpsFrameTime; // state to keep track of the
|
||
|
|
int _framesSinceLastFpsFrame; // actual frame trate, averaged
|
||
|
|
float _actualFrameRate; // over several frames
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|