blob: 909155d86809a142cc2cd4858e77a4ffc51a93df (
plain)
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
|
//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// OSXTimer.cpp: Implementation of a high precision timer class on OSX
#include "osx/OSXTimer.h"
#include <CoreServices/CoreServices.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
OSXTimer::OSXTimer()
: mRunning(false)
{
}
void OSXTimer::start()
{
mStartTime = mach_absolute_time();
mRunning = true;
}
void OSXTimer::stop()
{
mStopTime = mach_absolute_time();
mRunning = false;
}
double OSXTimer::getElapsedTime() const
{
// If this is the first time we've run, get the timebase.
// We can use denom == 0 to indicate that sTimebaseInfo is
// uninitialised because it makes no sense to have a zero
// denominator in a fraction.
static mach_timebase_info_data_t timebaseInfo;
static double secondCoeff;
if ( timebaseInfo.denom == 0 )
{
mach_timebase_info(&timebaseInfo);
secondCoeff = timebaseInfo.numer * (1.0 / 1000000000) / timebaseInfo.denom;
}
if (mRunning)
{
return secondCoeff * (mach_absolute_time() - mStartTime);
}
else
{
return secondCoeff * (mStopTime - mStartTime);
}
}
Timer *CreateTimer()
{
return new OSXTimer();
}
|
