game_toolkit_core/
time.rs

1use std::time::Duration;
2
3// `std::time::Instant::now` panics on wasm32-unknown-unknown; web-time re-exports std's
4// `Instant` on native and uses `performance.now()` in the browser.
5use web_time::Instant;
6
7pub struct Time {
8    pub elapsed: Duration,
9    pub delta: Duration,
10    pub frame: u64,
11    pub fps: f32,
12    start: Instant,
13    last_frame: Instant,
14    fps_accum: f32,
15}
16
17impl Time {
18    pub fn new() -> Self {
19        let now = Instant::now();
20        Self {
21            elapsed: Duration::ZERO,
22            delta: Duration::ZERO,
23            frame: 0,
24            fps: 0.0,
25            start: now,
26            last_frame: now,
27            fps_accum: 0.0,
28        }
29    }
30
31    pub fn tick(&mut self) {
32        let now = Instant::now();
33        self.delta = now - self.last_frame;
34        self.elapsed = now - self.start;
35        self.last_frame = now;
36        self.frame += 1;
37        let inst = 1.0 / self.delta.as_secs_f32().max(1e-6);
38        self.fps_accum = self.fps_accum * 0.95 + inst * 0.05;
39        self.fps = self.fps_accum;
40    }
41}
42
43impl Default for Time {
44    fn default() -> Self {
45        Self::new()
46    }
47}
game_toolkit_core/time.rs

game_toolkit_core/
time.rs
