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/**
* @file llframetimer.h
* @brief A lightweight timer that measures seconds and is only
* updated once per frame.
*
* $LicenseInfo:firstyear=2002&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library 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;
* version 2.1 of the License only.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#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"
class LL_COMMON_API 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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