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/**
* @file llframetimer.h
* @brief A lightweight timer that measures seconds and is only
* updated once per frame.
*
* $LicenseInfo:firstyear=2002&license=viewergpl$
*
* 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.
* $/LicenseInfo$
*/
#ifndef LL_LLFRAMETIMER_H
#define LL_LLFRAMETIMER_H
/**
* *NOTE: Because of limitations on linux which we do not really have
* time to explore, the total time is derived from the frame time
* and is recsynchronized on every frame.
*/
#include "lltimer.h"
#include "timing.h"
class LLFrameTimer
{
public:
LLFrameTimer() : mStartTime( sFrameTime ), mExpiry(0), mStarted(TRUE) {}
// Return the number of seconds since the start of this
// application instance.
static F64 getElapsedSeconds()
{
// Loses msec precision after ~4.5 hours...
return sFrameTime;
}
// Return a low precision usec since epoch
static U64 getTotalTime()
{
return sTotalTime ? sTotalTime : totalTime();
}
// Return a low precision seconds since epoch
static F64 getTotalSeconds()
{
return sTotalSeconds;
}
// Call this method once per frame to update the current frame time. This is actually called
// at some other times as well
static void updateFrameTime();
// Call this method once, and only once, per frame to update the current frame count.
static void updateFrameCount() { sFrameCount++; }
static U32 getFrameCount() { return sFrameCount; }
static F32 getFrameDeltaTimeF32();
// Return seconds since the current frame started
static F32 getCurrentFrameTime();
// MANIPULATORS
void start();
void stop();
void reset();
void resetWithExpiry(F32 expiration);
void pause();
void unpause();
void setTimerExpirySec(F32 expiration);
void setExpiryAt(F64 seconds_since_epoch);
BOOL checkExpirationAndReset(F32 expiration);
F32 getElapsedTimeAndResetF32() { F32 t = F32(sFrameTime - mStartTime); reset(); return t; }
void setAge(const F64 age) { mStartTime = sFrameTime - age; }
// ACCESSORS
BOOL hasExpired() const { return (sFrameTime >= mExpiry); }
F32 getTimeToExpireF32() const { return (F32)(mExpiry - sFrameTime); }
F32 getElapsedTimeF32() const { return mStarted ? (F32)(sFrameTime - mStartTime) : (F32)mStartTime; }
BOOL getStarted() const { return mStarted; }
// return the seconds since epoch when this timer will expire.
F64 expiresAt() const;
protected:
// A single, high resolution timer that drives all LLFrameTimers
// *NOTE: no longer used.
//static LLTimer sInternalTimer;
//
// Aplication constants
//
// Start time of opp in usec since epoch
static U64 sStartTotalTime;
//
// Data updated per frame
//
// Seconds since application start
static F64 sFrameTime;
// Time that has elapsed since last call to updateFrameTime()
static U64 sFrameDeltaTime;
// Total microseconds since epoch.
static U64 sTotalTime;
// Seconds since epoch.
static F64 sTotalSeconds;
// Total number of frames elapsed in application
static S32 sFrameCount;
//
// Member data
//
// Number of seconds after application start when this timer was
// started. Set equal to sFrameTime when reset.
F64 mStartTime;
// Timer expires this many seconds after application start time.
F64 mExpiry;
// Useful bit of state usually associated with timers, but does
// not affect actual functionality
BOOL mStarted;
};
// Glue code for Havok (or anything else that doesn't want the full .h files)
extern F32 getCurrentFrameTime();
#endif // LL_LLFRAMETIMER_H
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