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use std::{
ops::{Add, Div, Mul},
time::{Duration, Instant},
};
/// How often to update the fps interval on screen
const FPS_INTERVAL: Duration = Duration::from_millis(250);
/// How much to smooth he `delta_avg` amount (`AVG_RATIO`:1)
const AVG_RATIO: u32 = 10;
/// Keeps track of frame intervals and FPS
pub struct Timer {
/// Last time updated
previous: Instant,
/// Current time
now: Instant,
/// Rolling delta time average
delta_avg: Duration,
/// Computed fps
fps: f64,
/// Last time the fps was updated
fps_time: Instant,
/// Frame count
count: u32,
}
impl Timer {
pub fn new() -> Self {
let now = Instant::now();
Self {
previous: now,
now,
delta_avg: Duration::ZERO,
fps: 0.0,
fps_time: now,
count: 0,
}
}
pub fn update(&mut self) {
self.previous = self.now;
self.now = Instant::now();
self.delta_avg = self
.delta_avg
.mul(AVG_RATIO)
.add(self.delta_time())
.div(AVG_RATIO + 1);
if (self.now - self.fps_time) > FPS_INTERVAL {
self.fps = 1.0 / self.delta_avg.as_secs_f64();
self.fps_time = self.now;
}
self.count += 1;
}
pub fn get_frame(&self) -> u32 {
self.count
}
#[expect(clippy::cast_possible_truncation)]
pub fn get_fps(&self) -> u32 {
self.fps.ceil() as u32
}
pub fn delta_time(&self) -> Duration {
self.now - self.previous
}
}
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