How to Implement an FPS Counter
2 days ago
- #game development
- #real-time systems
- #performance monitoring
- Maintain a rolling window of frames within the last second to calculate FPS, avoiding methods based on single frames or a fixed number of frames for better accuracy.
- Use precise timers like SDL_GetPerformanceCounter or std::chrono::high_resolution_clock to ensure accurate time measurements for frame processing.
- Implement methods such as a queue of frame timestamps or processing times to aggregate data over a fixed duration, providing a smoothed and consistent FPS display.
- Avoid common pitfalls like using a variable history size dependent on frame rate, which can lead to misleading graphs and inconsistent measurements.
- Consider trade-offs in window length for real-time monitoring: shorter windows track rapid changes, while longer windows show long-term trends.
- Optionally, update the FPS display at a lower frequency (e.g., twice per second) to improve readability without altering the rolling window calculation.
- Use circular buffers or limited-capacity queues to manage memory efficiently and handle edge cases where the buffer may fill up.