MyGUI  3.2.0
MyGUI_Timer.cpp
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1 
6 /*
7  This file is part of MyGUI.
8 
9  MyGUI is free software: you can redistribute it and/or modify
10  it under the terms of the GNU Lesser General Public License as published by
11  the Free Software Foundation, either version 3 of the License, or
12  (at your option) any later version.
13 
14  MyGUI is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  GNU Lesser General Public License for more details.
18 
19  You should have received a copy of the GNU Lesser General Public License
20  along with MyGUI. If not, see <http://www.gnu.org/licenses/>.
21 */
22 #include "MyGUI_Precompiled.h"
23 #include "MyGUI_Timer.h"
24 
25 #if MYGUI_COMPILER == MYGUI_COMPILER_MSVC
26 # include <windows.h>
27 # pragma comment(lib, "winmm.lib")
28 #else
29 # include <sys/time.h>
30 #endif
31 
32 namespace MyGUI
33 {
34 
36  mTimeStart(0)
37  {
38  }
39 
40  void Timer::reset()
41  {
42  mTimeStart = getCurrentMilliseconds();
43  }
44 
45  unsigned long Timer::getMilliseconds()
46  {
47  return getCurrentMilliseconds() - mTimeStart;
48  }
49 
50  unsigned long Timer::getCurrentMilliseconds()
51  {
52 #if MYGUI_COMPILER == MYGUI_COMPILER_MSVC
53  /*
54  We do this because clock() is not affected by timeBeginPeriod on Win32.
55  QueryPerformanceCounter is a little overkill for the amount of precision that
56  I consider acceptable. If someone submits a patch that replaces this code
57  with QueryPerformanceCounter, I wouldn't complain. Until then, timeGetTime
58  gets the results I'm after. -EMS
59 
60  See: http://www.geisswerks.com/ryan/FAQS/timing.html
61  And: http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323&
62  */
63  return timeGetTime();
64 #else
65  struct timeval now;
66  gettimeofday(&now, NULL);
67  return (now.tv_sec) * 1000 + (now.tv_usec) / 1000;
68  //return ( unsigned long )(( double )( clock() ) / (( double )CLOCKS_PER_SEC / 1000.0 ) );
69 #endif
70  }
71 
72 } // namespace MyGUI