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
|
// MIT License
// Copyright (c) 2019 Erin Catto
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "box2d/b2_timer.h"
#if defined(_WIN32)
double b2Timer::s_invFrequency = 0.0;
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
b2Timer::b2Timer()
{
LARGE_INTEGER largeInteger;
if (s_invFrequency == 0.0)
{
QueryPerformanceFrequency(&largeInteger);
s_invFrequency = double(largeInteger.QuadPart);
if (s_invFrequency > 0.0)
{
s_invFrequency = 1000.0 / s_invFrequency;
}
}
QueryPerformanceCounter(&largeInteger);
m_start = double(largeInteger.QuadPart);
}
void b2Timer::Reset()
{
LARGE_INTEGER largeInteger;
QueryPerformanceCounter(&largeInteger);
m_start = double(largeInteger.QuadPart);
}
float b2Timer::GetMilliseconds() const
{
LARGE_INTEGER largeInteger;
QueryPerformanceCounter(&largeInteger);
double count = double(largeInteger.QuadPart);
float ms = float(s_invFrequency * (count - m_start));
return ms;
}
#elif defined(__linux__) || defined (__APPLE__)
#include <sys/time.h>
b2Timer::b2Timer()
{
Reset();
}
void b2Timer::Reset()
{
timeval t;
gettimeofday(&t, 0);
m_start_sec = t.tv_sec;
m_start_usec = t.tv_usec;
}
float b2Timer::GetMilliseconds() const
{
timeval t;
gettimeofday(&t, 0);
time_t start_sec = m_start_sec;
suseconds_t start_usec = m_start_usec;
// http://www.gnu.org/software/libc/manual/html_node/Elapsed-Time.html
if (t.tv_usec < start_usec)
{
int nsec = (start_usec - t.tv_usec) / 1000000 + 1;
start_usec -= 1000000 * nsec;
start_sec += nsec;
}
if (t.tv_usec - start_usec > 1000000)
{
int nsec = (t.tv_usec - start_usec) / 1000000;
start_usec += 1000000 * nsec;
start_sec -= nsec;
}
return 1000.0f * (t.tv_sec - start_sec) + 0.001f * (t.tv_usec - start_usec);
}
#else
b2Timer::b2Timer()
{
}
void b2Timer::Reset()
{
}
float b2Timer::GetMilliseconds() const
{
return 0.0f;
}
#endif
|
