OpenMW/mscripts/fpsticker.mn

// Small script that prints the FPS to screen with regular intervals.
class FPSTicker;

import frames;

// Set the FPS widget text
native setText(char[][] args...);

run()
{
  // Sleep one frame. This makes sure that we won't start running until
  // the rendering begins. Not critically important, but it prevents the
  // first printed value from being 'nan'.
  fsleep(1);

  setText("hello!");

  // counter and totalTime (in the 'frames' module) are updated
  // automatically by the system.
  ulong lastFrame  = counter;
  float lastTime   = totalTime;

  float delay = 1.5;

  while(true)
    {
      sleep(delay);

      // Calculate differences since last frame
      ulong fdiff = counter-lastFrame;
      float tdiff = totalTime-lastTime;

      setText("fps: ", fdiff / tdiff);

      lastFrame = counter;
      lastTime = totalTime;
    }
}