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/**
* @file llframetimer.h
* @brief A lightweight timer that measures seconds and is only
* updated once per frame.
*
* Copyright (c) 2002-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#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.
static void updateFrameTime();
static S32 getFrameCount() { return sFrameCount; }
static F32 getFrameDeltaTimeF32();
// MANIPULATORS
void start() { reset(); mStarted = TRUE; }
void stop() { mStarted = FALSE; }
void reset() { mStartTime = sFrameTime; mExpiry = sFrameTime; }
void setTimerExpirySec(F32 expiration) { mExpiry = expiration + mStartTime; }
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 (F32)(sFrameTime - 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;
};
#endif // LL_LLFRAMETIMER_H
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