ocelot-desktop/src/main/scala/ocelot/desktop/util/FPSCalculator.scala

package ocelot.desktop.util

class FPSCalculator {
  private var prevTime = System.currentTimeMillis()
  private var numFrames = 0

  private[this] var _fps: Float = 0

  def fps: Float = _fps

  def tick(): Unit = {
    val currentTime = System.currentTimeMillis()

    numFrames += 1

    if (currentTime - prevTime > 1000) {
      val delta = currentTime - prevTime
      prevTime = currentTime
      numFrames = 0
      _fps = numFrames.asInstanceOf[Float] / delta * 1000f
    }
  }
}