1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
/**
* @file llframetimer.h
* @brief A lightweight timer that measures seconds and is only
* updated once per frame.
*
* Copyright (c) 2002-2007, Linden Research, Inc.
*
* 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://secondlife.com/developers/opensource/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://secondlife.com/developers/opensource/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.
*/
#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
|
