Timer.cpp

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#include "Timer.hpp"

namespace Spidar
{
namespace Win32
{
void Timer::initialize(double frequency)
{
    deltaTime_ = 0;
    avgDeltaTime_ = 0;
    maxDeltaTime_ = 0;
    minDeltaTime_ = 10;

    ::QueryPerformanceFrequency(&systemFrequency_);

    cycle_ = static_cast<LONGLONG>(systemFrequency_.QuadPart / frequency);

    ::QueryPerformanceCounter(&countPrev_);
}

void Timer::wait(void)
{
    LONGLONG delta = 0;

    while (delta < cycle_)
    {
        ::QueryPerformanceCounter(&countCurr_);

        delta = countCurr_.QuadPart - countPrev_.QuadPart;
    }
    countPrev_ = countCurr_;

    deltaTime_ = static_cast<double>(delta) / systemFrequency_.QuadPart;

    avgDeltaTime_ = avgDeltaTime_ * 0.99 + deltaTime_ * 0.01;

    if (maxDeltaTime_ < deltaTime_)     maxDeltaTime_ = deltaTime_;
    if (minDeltaTime_ > deltaTime_)     minDeltaTime_ = deltaTime_;
}

} // end of namespace Win32.
} // end of namespace Spidar.

// end of file.