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      1 //
      2 // Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
      3 // Use of this source code is governed by a BSD-style license that can be
      4 // found in the LICENSE file.
      5 //
      6 
      7 #include "win32/Win32Timer.h"
      8 
      9 Win32Timer::Win32Timer()
     10     : mRunning(0),
     11       mStartTime(0),
     12       mStopTime(0)
     13 {
     14 }
     15 
     16 void Win32Timer::start()
     17 {
     18     LARGE_INTEGER frequency;
     19     QueryPerformanceFrequency(&frequency);
     20     mFrequency = frequency.QuadPart;
     21 
     22     LARGE_INTEGER curTime;
     23     QueryPerformanceCounter(&curTime);
     24     mStartTime = curTime.QuadPart;
     25 
     26     mRunning = true;
     27 }
     28 
     29 void Win32Timer::stop()
     30 {
     31     LARGE_INTEGER curTime;
     32     QueryPerformanceCounter(&curTime);
     33     mStopTime = curTime.QuadPart;
     34 
     35     mRunning = false;
     36 }
     37 
     38 double Win32Timer::getElapsedTime() const
     39 {
     40     LONGLONG endTime;
     41     if (mRunning)
     42     {
     43         LARGE_INTEGER curTime;
     44         QueryPerformanceCounter(&curTime);
     45         endTime = curTime.QuadPart;
     46     }
     47     else
     48     {
     49         endTime = mStopTime;
     50     }
     51 
     52     return static_cast<double>(endTime - mStartTime) / mFrequency;
     53 }
     54 
     55 Timer *CreateTimer()
     56 {
     57     return new Win32Timer();
     58 }
     59