Timer.cpp

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#include "Timer.h"

void Timer::init() {
        __int64 rate;

        QueryPerformanceFrequency((LARGE_INTEGER*)&rate);

        frequency = 1.0/(double)rate;

        QueryPerformanceCounter((LARGE_INTEGER*)&startClock);

        frameTime       = 0.0f;
        frameStart      = (float)getTime();
        frameEnd        = 0.0f;
        fpsLimiter      = 0.0f;
        fps                     = 0;
        frameCount      = 0;
}

void Timer::update() {
        static float t_fps[15];
        static int currPos = 0;

        do {
                frameEnd = (float)getTime();
        } while (frameEnd == frameStart);

        frameTime = frameEnd - frameStart;
        frameStart = frameEnd;

        ++frameCount;

        fpsLimiter += frameTime;
        if (fpsLimiter > 1.0f) {
                fps = frameCount;
                fpsLimiter = 0.0f;
                frameCount = 0;
        }
}

double Timer::getTime() {
        __int64 endClock;
        QueryPerformanceCounter((LARGE_INTEGER*)&endClock);
        return (double)(endClock-startClock)*frequency;
}

float Timer::getFrameTime() {
        return frameTime;
}

int Timer::getFPS() {
        return fps;
}

double Timer::getFrequency() {
        return frequency;
}

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