blob: 74b60b06fef442dd42e489d309143942166e269e (
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
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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/************************************************************************************
Filename : OVR_Timer.cpp
Content : Provides static functions for precise timing
Created : September 19, 2012
Notes :
Copyright : Copyright 2013 Oculus VR, Inc. All Rights reserved.
Licensed under the Oculus VR SDK License Version 2.0 (the "License");
you may not use the Oculus VR SDK except in compliance with the License,
which is provided at the time of installation or download, or which
otherwise accompanies this software in either electronic or hard copy form.
You may obtain a copy of the License at
http://www.oculusvr.com/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, the Oculus VR SDK
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
************************************************************************************/
#include "OVR_Timer.h"
#include "OVR_Log.h"
#if defined (OVR_OS_WIN32)
#include <windows.h>
#elif defined(OVR_OS_ANDROID)
#include <time.h>
#include <android/log.h>
#else
#include <sys/time.h>
#endif
namespace OVR {
//------------------------------------------------------------------------
// *** Timer - Platform Independent functions
double ovr_GetTimeInSeconds()
{
return Timer::GetSeconds();
}
UInt64 Timer::GetProfileTicks()
{
return (GetRawTicks() * MksPerSecond) / GetRawFrequency();
}
double Timer::GetProfileSeconds()
{
static UInt64 StartTime = GetProfileTicks();
return TicksToSeconds(GetProfileTicks()-StartTime);
}
#ifndef OVR_OS_ANDROID
double Timer::GetSeconds()
{
return (double)Timer::GetRawTicks() / (double) GetRawFrequency();
}
#endif
//------------------------------------------------------------------------
// *** Android Specific Timer
#if defined(OVR_OS_ANDROID)
// Returns global high-resolution application timer in seconds.
double Timer::GetSeconds()
{
return double(Timer::GetRawTicks()) * 0.000000001;
}
UInt64 Timer::GetRawTicks()
{
// Choreographer vsync timestamp is based on.
struct timespec tp;
const int status = clock_gettime(CLOCK_MONOTONIC, &tp);
if (status != 0)
{
OVR_DEBUG_LOG(("clock_gettime status=%i", status ));
}
const UInt64 result = (UInt64)tp.tv_sec * (UInt64)(1000 * 1000 * 1000) + UInt64(tp.tv_nsec);
return result;
}
UInt64 Timer::GetRawFrequency()
{
return MksPerSecond * 1000;
}
#endif
//------------------------------------------------------------------------
// *** Win32 Specific Timer
#if defined (OVR_OS_WIN32)
CRITICAL_SECTION WinAPI_GetTimeCS;
volatile UInt32 WinAPI_OldTime = 0;
volatile UInt32 WinAPI_WrapCounter = 0;
UInt32 Timer::GetTicksMs()
{
return timeGetTime();
}
UInt64 Timer::GetTicks()
{
DWORD ticks = timeGetTime();
UInt64 result;
// On Win32 QueryPerformanceFrequency is unreliable due to SMP and
// performance levels, so use this logic to detect wrapping and track
// high bits.
::EnterCriticalSection(&WinAPI_GetTimeCS);
if (WinAPI_OldTime > ticks)
WinAPI_WrapCounter++;
WinAPI_OldTime = ticks;
result = (UInt64(WinAPI_WrapCounter) << 32) | ticks;
::LeaveCriticalSection(&WinAPI_GetTimeCS);
return result * MksPerMs;
}
UInt64 Timer::GetRawTicks()
{
LARGE_INTEGER li;
QueryPerformanceCounter(&li);
return li.QuadPart;
}
UInt64 Timer::GetRawFrequency()
{
static UInt64 perfFreq = 0;
if (perfFreq == 0)
{
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
perfFreq = freq.QuadPart;
}
return perfFreq;
}
void Timer::initializeTimerSystem()
{
timeBeginPeriod(1);
InitializeCriticalSection(&WinAPI_GetTimeCS);
}
void Timer::shutdownTimerSystem()
{
DeleteCriticalSection(&WinAPI_GetTimeCS);
timeEndPeriod(1);
}
#else // !OVR_OS_WIN32
//------------------------------------------------------------------------
// *** Standard OS Timer
UInt32 Timer::GetTicksMs()
{
return (UInt32)(GetProfileTicks() / 1000);
}
// The profile ticks implementation is just fine for a normal timer.
UInt64 Timer::GetTicks()
{
return GetProfileTicks();
}
void Timer::initializeTimerSystem()
{
}
void Timer::shutdownTimerSystem()
{
}
#if !defined(OVR_OS_ANDROID)
UInt64 Timer::GetRawTicks()
{
// TODO: prefer rdtsc when available?
UInt64 result;
// Return microseconds.
struct timeval tv;
gettimeofday(&tv, 0);
result = (UInt64)tv.tv_sec * 1000000;
result += tv.tv_usec;
return result;
}
UInt64 Timer::GetRawFrequency()
{
return MksPerSecond;
}
#endif // !OVR_OS_ANDROID
#endif // !OVR_OS_WIN32
} // OVR
|
