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
|
#include "Clock.h"
#if defined(DEATH_TARGET_WINDOWS)
# include <winsync.h>
# include <profileapi.h>
#elif defined(DEATH_TARGET_APPLE)
# include <Availability.h>
# if __MAC_10_12
# include <time.h>
# else
# include <mach/mach_time.h>
# endif
#else
# include <time.h> // for clock_gettime()
# include <sys/time.h> // for gettimeofday()
#endif
namespace nCine
{
Clock& clock()
{
static Clock instance;
return instance;
}
Clock::Clock()
: _frequency(0UL)
{
#if defined(DEATH_TARGET_WINDOWS)
LARGE_INTEGER li;
if (::QueryPerformanceFrequency(&li)) {
_frequency = li.LowPart;
_hasPerfCounter = true;
} else {
_frequency = 1000L;
_hasPerfCounter = false;
}
#elif defined(DEATH_TARGET_APPLE)
# if __MAC_10_12
_frequency = 1.0e9L;
# else
mach_timebase_info_data_t info;
mach_timebase_info(&info);
_frequency = (info.denom * 1.0e9L) / info.numer;
# endif
#else
struct timespec resolution;
if (clock_getres(CLOCK_MONOTONIC, &resolution) == 0) {
_frequency = 1.0e9L;
_hasMonotonicClock = true;
} else {
_frequency = 1.0e6L;
_hasMonotonicClock = false;
}
#endif
}
std::uint64_t Clock::counter() const
{
#if defined(DEATH_TARGET_WINDOWS)
if (_hasPerfCounter) {
LARGE_INTEGER li;
::QueryPerformanceCounter(&li);
return li.QuadPart;
} else {
return ::GetTickCount64();
}
#elif defined(DEATH_TARGET_APPLE)
# if __MAC_10_12
return clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW);
# else
return mach_absolute_time();
# endif
#else
if (_hasMonotonicClock) {
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
return static_cast<std::uint64_t>(now.tv_sec) * _frequency + static_cast<std::uint64_t>(now.tv_nsec);
} else {
struct timeval now;
gettimeofday(&now, nullptr);
return static_cast<std::uint64_t>(now.tv_sec) * _frequency + static_cast<std::uint64_t>(now.tv_usec);
}
#endif
}
}
|
