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
142
143
144
145
146
147
148
149
150
151
|
/**
* @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 F64SecondsImplicit getElapsedSeconds()
{
// Loses msec precision after ~4.5 hours...
return sFrameTime;
}
// Return a low precision usec since epoch
static U64 getTotalTime()
{
return sTotalTime ? U64MicrosecondsImplicit(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
|
