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Timer.cpp
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Timer.cpp
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//--------------------------------------------------------------------------------------
// Timer class - works like a stopwatch
//--------------------------------------------------------------------------------------
#include "Timer.h"
#pragma comment( lib, "winmm.lib" )
// Constructor //
Timer::Timer()
{
// Try to initialise performance timer, will use low-resolution timer on failure
mHighRes = (QueryPerformanceFrequency( &mHighResFreq ) != 0);
// Reset and start the timer
Reset();
mRunning = true;
}
// Timer control //
// Start the timer running
void Timer::Start()
{
if (!mRunning)
{
mRunning = true;
// Get restart time - add time passed since stop time to the start and lap times
// Select high or low-resolution timer
if (mHighRes)
{
LARGE_INTEGER newHighResTime;
QueryPerformanceCounter( &newHighResTime );
mHighResStart.QuadPart += (newHighResTime.QuadPart - mHighResStop.QuadPart);
mHighResLap.QuadPart += (newHighResTime.QuadPart - mHighResStop.QuadPart);
}
else
{
DWORD newLowResTime;
newLowResTime = timeGetTime();
mLowResStart += (newLowResTime - mLowResStop);
mLowResLap += (newLowResTime - mLowResStop);
}
}
}
// Stop the timer running
void Timer::Stop()
{
mRunning = false;
// Get stop time
// Select high or low-resolution timer
if (mHighRes)
{
QueryPerformanceCounter( &mHighResStop );
}
else
{
mLowResStop = timeGetTime();
}
}
// Reset the timer to zero
void Timer::Reset()
{
// Reset start, lap and stop times to current time
// Select high or low-resolution timer
if (mHighRes)
{
QueryPerformanceCounter( &mHighResStart );
mHighResLap = mHighResStart;
mHighResStop = mHighResStart;
}
else
{
mLowResStart = timeGetTime();
mLowResLap = mLowResStart;
mLowResStop = mLowResStart;
}
}
// Timing //
// Get frequency of the timer being used (in counts per second)
float Timer::GetFrequency()
{
// Select high or low-resolution timer
if (mHighRes)
{
return static_cast<float>(mHighResFreq.QuadPart);
}
else
{
return 1000.0f;
}
}
// Get time passed (seconds) since since timer was started or last reset
float Timer::GetTime()
{
float fTime;
if (mHighRes)
{
LARGE_INTEGER newHighResTime;
if (mRunning)
{
QueryPerformanceCounter( &newHighResTime );
}
else
{
newHighResTime = mHighResStop;
}
double dTime = static_cast<double>(newHighResTime.QuadPart - mHighResStart.QuadPart) /
static_cast<double>(mHighResFreq.QuadPart);
fTime = static_cast<float>(dTime);
}
else
{
DWORD newLowResTime;
if (mRunning)
{
newLowResTime = timeGetTime();
}
else
{
newLowResTime = mLowResStop;
}
fTime = static_cast<float>(newLowResTime - mLowResStart) / 1000.0f;
}
return fTime;
}
// Get time passed (seconds) since last call to this function. If this is the first call, then
// the time since timer was started or the last reset is returned
float Timer::GetLapTime()
{
float fTime;
if (mHighRes)
{
LARGE_INTEGER newHighResTime;
if (mRunning)
{
QueryPerformanceCounter( &newHighResTime );
}
else
{
newHighResTime = mHighResStop;
}
double dTime = static_cast<double>(newHighResTime.QuadPart - mHighResLap.QuadPart) /
static_cast<double>(mHighResFreq.QuadPart);
fTime = static_cast<float>(dTime);
mHighResLap = newHighResTime;
}
else
{
DWORD newLowResTime;
if (mRunning)
{
newLowResTime = timeGetTime();
}
else
{
newLowResTime = mLowResStop;
}
fTime = static_cast<float>(newLowResTime - mLowResLap) / 1000.0f;
mLowResLap = newLowResTime;
}
return fTime;
}