[692] | 1 | /*
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| 2 | -----------------------------------------------------------------------------
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| 3 | This source file is part of OGRE
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| 4 | (Object-oriented Graphics Rendering Engine)
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| 5 | For the latest info, see http://www.ogre3d.org/
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| 6 |
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| 7 | Copyright (c) 2000-2005 The OGRE Team
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| 8 | Also see acknowledgements in Readme.html
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| 9 |
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| 10 | This program is free software; you can redistribute it and/or modify it under
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software
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| 12 | Foundation; either version 2 of the License, or (at your option) any later
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| 13 | version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with
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| 20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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| 22 | http://www.gnu.org/copyleft/lesser.txt.
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| 23 | -----------------------------------------------------------------------------
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| 24 | */
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| 25 | #include "OgreWin32Timer.h"
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| 26 |
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| 27 | namespace Ogre {
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| 28 | //-------------------------------------------------------------------------
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| 29 | void Win32Timer::reset()
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| 30 | {
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| 31 | Timer::reset();
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| 32 | QueryPerformanceFrequency(&mFrequency);
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| 33 | QueryPerformanceCounter(&mStartTime);
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| 34 | mStartTick = GetTickCount();
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| 35 | mLastTime = 0;
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| 36 | mQueryCount = 0;
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| 37 |
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| 38 | // Save the current process
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| 39 | HANDLE mProc = GetCurrentProcess();
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| 40 |
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| 41 | // Get the current Affinity
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| 42 | GetProcessAffinityMask(mProc, &mProcMask, &mSysMask);
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| 43 |
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| 44 | mThread = GetCurrentThread();
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| 45 | }
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| 46 | //-------------------------------------------------------------------------
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| 47 | unsigned long Win32Timer::getMilliseconds()
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| 48 | {
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| 49 | LARGE_INTEGER curTime;
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| 50 |
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| 51 | // Set affinity to the first core
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| 52 | SetThreadAffinityMask(mThread, 1);
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| 53 |
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| 54 | // Query the timer
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| 55 | QueryPerformanceCounter(&curTime);
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| 56 |
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| 57 | // Reset affinity
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| 58 | SetThreadAffinityMask(mThread, mProcMask);
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| 59 |
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| 60 | // Resample the frequency
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| 61 | mQueryCount++;
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| 62 | if(mQueryCount == FREQUENCY_RESAMPLE_RATE)
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| 63 | {
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| 64 | mQueryCount = 0;
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| 65 | QueryPerformanceFrequency(&mFrequency);
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| 66 | }
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| 67 |
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| 68 | LONGLONG newTime = curTime.QuadPart - mStartTime.QuadPart;
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| 69 |
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| 70 | // scale by 1000 for milliseconds
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| 71 | unsigned long newTicks = (unsigned long) (1000 * newTime / mFrequency.QuadPart);
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| 72 |
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| 73 | // detect and compensate for performance counter leaps
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| 74 | // (surprisingly common, see Microsoft KB: Q274323)
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| 75 | unsigned long check = GetTickCount() - mStartTick;
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| 76 | signed long msecOff = (signed long)(newTicks - check);
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| 77 | if (msecOff < -100 || msecOff > 100)
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| 78 | {
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| 79 | // We must keep the timer running forward :)
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| 80 | LONGLONG adjust = (std::min)(msecOff * mFrequency.QuadPart / 1000, newTime - mLastTime);
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| 81 | mStartTime.QuadPart += adjust;
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| 82 | newTime -= adjust;
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| 83 |
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| 84 | // Re-calculate milliseconds
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| 85 | newTicks = (unsigned long) (1000 * newTime / mFrequency.QuadPart);
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| 86 | }
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| 87 |
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| 88 | // Record last time for adjust
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| 89 | mLastTime = newTime;
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| 90 |
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| 91 | return newTicks;
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| 92 | }
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| 93 | //-------------------------------------------------------------------------
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| 94 | unsigned long Win32Timer::getMicroseconds()
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| 95 | {
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| 96 | LARGE_INTEGER curTime;
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| 97 | QueryPerformanceCounter(&curTime);
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| 98 | LONGLONG newTime = curTime.QuadPart - mStartTime.QuadPart;
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| 99 |
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| 100 | // get milliseconds to check against GetTickCount
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| 101 | unsigned long newTicks = (unsigned long) (1000 * newTime / mFrequency.QuadPart);
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| 102 |
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| 103 | // detect and compensate for performance counter leaps
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| 104 | // (surprisingly common, see Microsoft KB: Q274323)
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| 105 | unsigned long check = GetTickCount() - mStartTick;
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| 106 | signed long msecOff = (signed long)(newTicks - check);
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| 107 | if (msecOff < -100 || msecOff > 100)
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| 108 | {
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| 109 | // We must keep the timer running forward :)
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| 110 | LONGLONG adjust = (std::min)(msecOff * mFrequency.QuadPart / 1000, newTime - mLastTime);
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| 111 | mStartTime.QuadPart += adjust;
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| 112 | newTime -= adjust;
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| 113 | }
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| 114 |
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| 115 | // Record last time for adjust
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| 116 | mLastTime = newTime;
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| 117 |
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| 118 | // scale by 1000000 for microseconds
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| 119 | unsigned long newMicro = (unsigned long) (1000000 * newTime / mFrequency.QuadPart);
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| 120 |
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| 121 | return newMicro;
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| 122 | }
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| 123 |
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| 124 | }
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