FrameRateHandler.cpp

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#include "Headers/FrameRateHandler.h"
 
namespace Divide::Time {
 
 
void FrameRateHandler::tick(const U64 deltaTimeUS) noexcept {
    const F32 elapsedSeconds = Time::MicrosecondsToSeconds<F32>(deltaTimeUS);
    const F32 deltaSeconds = elapsedSeconds - _previousElapsedSeconds;
    _framerateSecPerFrameAccum += deltaSeconds - _framerateSecPerFrame[_framerateSecPerFrameIdx];
    _framerateSecPerFrame[_framerateSecPerFrameIdx] = deltaSeconds;
    _framerateSecPerFrameIdx = (_framerateSecPerFrameIdx + 1) % FRAME_ARRAY_SIZE;
    _framerate = 1.0f / (_framerateSecPerFrameAccum / to_F32(FRAME_ARRAY_SIZE));
    _previousElapsedSeconds = elapsedSeconds;
 
    _averageFPS += _framerate;
 
    if (_frameCount > FRAME_AVG_DELAY_COUNT) {
        _maxFPS = std::max(_framerate, _maxFPS);
        _minFPS = std::min(_framerate, _minFPS);
    }
 
    // Min/max frame rate
    if (++_frameCount > FRAME_AVG_RESET_COUNT) {
        _averageFPS = 0.0f;
        _frameCount = 0;
        _minFPS = F32_MAX;
        _maxFPS = F32_LOWEST;
    }
}
 
} //namespace Divide::Time