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cs440-acg/ext/openexr/OpenEXR_Viewers/playexr/Timer.cpp

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+///////////////////////////////////////////////////////////////////////////
+//
+// 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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+//----------------------------------------------------------------------------
+//
+//	Timing control for the display thread of the playExr prgram
+//
+//----------------------------------------------------------------------------
+
+#include "Timer.h"
+#include <time.h>
+
+#ifdef _WIN32
+
+    #include <windows.h>
+
+    static int
+    gettimeofday (struct timeval *tv, void *tz)
+    {
+	union
+	{
+	    ULONGLONG ns100;  // time since 1 Jan 1601 in 100ns units
+	    FILETIME ft;
+	} now;
+    
+	GetSystemTimeAsFileTime (&now.ft);
+	tv->tv_usec = long ((now.ns100 / 10LL) % 1000000LL);
+	tv->tv_sec = long ((now.ns100 - 116444736000000000LL) / 10000000LL);
+
+	return 0;
+    } 
+
+#endif
+
+
+Timer::Timer ():
+    playState (RUNNING),
+    _spf (1 / 24.0),
+    _timingError (0),
+    _framesSinceLastFpsFrame (0),
+    _actualFrameRate (0)
+{
+    gettimeofday (&_lastFrameTime, 0);
+    _lastFpsFrameTime = _lastFrameTime;
+}
+
+
+void
+Timer::waitUntilNextFrameIsDue ()
+{
+    if (playState != RUNNING)
+    {
+	//
+	// If we are not running, reset all timing state
+	// variables and return without waiting.
+	//
+
+	gettimeofday (&_lastFrameTime, 0);
+	_timingError = 0;
+	_lastFpsFrameTime = _lastFrameTime;
+	_framesSinceLastFpsFrame = 0;
+	return;
+    }
+
+    //
+    // If less than _spf seconds have passed since the last frame
+    // was displayed, sleep until exactly _spf seconds have gone by.
+    //
+
+    timeval now;
+    gettimeofday (&now, 0);
+
+    float timeSinceLastFrame =  now.tv_sec  - _lastFrameTime.tv_sec +
+			       (now.tv_usec - _lastFrameTime.tv_usec) * 1e-6f;
+
+    float timeToSleep = _spf - timeSinceLastFrame - _timingError;
+
+    #ifdef _WIN32
+
+	if (timeToSleep > 0)
+	    Sleep (int (timeToSleep * 1000.0f));
+
+    #else
+
+	if (timeToSleep > 0)
+	{
+	    timespec ts;
+	    ts.tv_sec = (time_t) timeToSleep;
+	    ts.tv_nsec = (long) ((timeToSleep - ts.tv_sec) * 1e9f);
+	    nanosleep (&ts, 0);
+	}
+
+    #endif
+
+    //
+    // If we slept, it is possible that we woke up a little too early
+    // or a little too late.  Keep track of the difference between
+    // now and the exact time when we wanted to wake up; next time
+    // we'll try sleep that much longer or shorter.  This should
+    // keep our average frame rate close to one fame every _spf seconds.
+    //
+
+    gettimeofday (&now, 0);
+
+    timeSinceLastFrame =  now.tv_sec  - _lastFrameTime.tv_sec +
+		         (now.tv_usec - _lastFrameTime.tv_usec) * 1e-6f;
+
+    _timingError += timeSinceLastFrame - _spf;
+
+    if (_timingError < -2 * _spf)
+	_timingError = -2 * _spf;
+
+    if (_timingError >  2 * _spf)
+	_timingError =  2 * _spf;
+
+    _lastFrameTime = now;
+
+    //
+    // Calculate our actual frame rate, averaged over several frames.
+    //
+
+    if (_framesSinceLastFpsFrame >= 24)
+    {
+	float t =  now.tv_sec  - _lastFpsFrameTime.tv_sec +
+		  (now.tv_usec - _lastFpsFrameTime.tv_usec) * 1e-6f;
+
+	if (t > 0)
+	    _actualFrameRate = _framesSinceLastFpsFrame / t;
+
+	_framesSinceLastFpsFrame = 0;
+    }
+
+    if (_framesSinceLastFpsFrame == 0)
+	_lastFpsFrameTime = now;
+
+    _framesSinceLastFpsFrame += 1;
+}
+
+
+void
+Timer::setDesiredFrameRate (float fps)
+{
+    _spf = 1 / fps;
+}
+
+
+float
+Timer::actualFrameRate ()
+{
+    return _actualFrameRate;
+}