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/**
* @file llframetimer.cpp
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* Copyright (c) 2002-2008, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "u64.h"
#include "llframetimer.h"
// Static members
//LLTimer LLFrameTimer::sInternalTimer;
U64 LLFrameTimer::sStartTotalTime = totalTime();
F64 LLFrameTimer::sFrameTime = 0.0;
U64 LLFrameTimer::sTotalTime = 0;
F64 LLFrameTimer::sTotalSeconds = 0.0;
S32 LLFrameTimer::sFrameCount = 0;
U64 LLFrameTimer::sFrameDeltaTime = 0;
const F64 USEC_PER_SECOND = 1000000.0;
const F64 USEC_TO_SEC_F64 = 0.000001;
// static
void LLFrameTimer::updateFrameTime()
{
U64 total_time = totalTime();
sFrameDeltaTime = total_time - sTotalTime;
sTotalTime = total_time;
sTotalSeconds = U64_to_F64(sTotalTime) * USEC_TO_SEC_F64;
sFrameTime = U64_to_F64(sTotalTime - sStartTotalTime) * USEC_TO_SEC_F64;
sFrameCount++;
}
void LLFrameTimer::start()
{
reset();
mStarted = TRUE;
}
void LLFrameTimer::stop()
{
mStarted = FALSE;
}
void LLFrameTimer::reset()
{
mStartTime = sFrameTime;
mExpiry = sFrameTime;
}
void LLFrameTimer::resetWithExpiry(F32 expiration)
{
reset();
setTimerExpirySec(expiration);
}
// Don't combine pause/unpause with start/stop
// Useage:
// LLFrameTime foo; // starts automatically
// foo.unpause(); // noop but safe
// foo.pause(); // pauses timer
// foo.unpause() // unpauses
// F32 elapsed = foo.getElapsedTimeF32() // does not include time between pause() and unpause()
// Note: elapsed would also be valid with no unpause() call (= time run until pause() called)
void LLFrameTimer::pause()
{
if (mStarted)
mStartTime = sFrameTime - mStartTime; // save dtime
mStarted = FALSE;
}
void LLFrameTimer::unpause()
{
if (!mStarted)
mStartTime = sFrameTime - mStartTime; // restore dtime
mStarted = TRUE;
}
void LLFrameTimer::setTimerExpirySec(F32 expiration)
{
mExpiry = expiration + mStartTime;
}
void LLFrameTimer::setExpiryAt(F64 seconds_since_epoch)
{
mStartTime = sFrameTime;
mExpiry = seconds_since_epoch - (USEC_TO_SEC_F64 * sStartTotalTime);
}
F64 LLFrameTimer::expiresAt() const
{
F64 expires_at = U64_to_F64(sStartTotalTime) * USEC_TO_SEC_F64;
expires_at += mExpiry;
return expires_at;
}
BOOL LLFrameTimer::checkExpirationAndReset(F32 expiration)
{
//llinfos << "LLFrameTimer::checkExpirationAndReset()" << llendl;
//llinfos << " mStartTime:" << mStartTime << llendl;
//llinfos << " sFrameTime:" << sFrameTime << llendl;
//llinfos << " mExpiry: " << mExpiry << llendl;
if(hasExpired())
{
reset();
setTimerExpirySec(expiration);
return TRUE;
}
return FALSE;
}
// static
F32 LLFrameTimer::getFrameDeltaTimeF32()
{
return (F32)(U64_to_F64(sFrameDeltaTime) * USEC_TO_SEC_F64);
}
// static
// Return seconds since the current frame started
F32 LLFrameTimer::getCurrentFrameTime()
{
U64 frame_time = totalTime() - sTotalTime;
return (F32)(U64_to_F64(frame_time) * USEC_TO_SEC_F64);
}
// Glue code to avoid full class .h file #includes
F32 getCurrentFrameTime()
{
return (F32)(LLFrameTimer::getCurrentFrameTime());
}
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