48 lines
1.5 KiB
Rust
48 lines
1.5 KiB
Rust
#[allow(unused)]
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use log::{debug, warn};
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use std::thread;
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use std::time::{Duration, Instant};
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/// Converts helios Geometry to Helios
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#[allow(dead_code)]
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#[derive(Debug, Clone, Copy)]
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pub struct Framerate {
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start: Instant,
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prev_trace_time: Instant,
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framerate: u8,
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}
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#[allow(dead_code)]
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impl Framerate {
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pub fn new(framerate: u8) -> Result<Self, Box<dyn std::error::Error>> {
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Ok(Framerate {
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start: Instant::now(),
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prev_trace_time: Instant::now(),
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framerate,
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})
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}
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pub fn handle_time(&mut self) -> Result<f64, Box<dyn std::error::Error>> {
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let frame_time = 1000000000 / self.framerate as u128;
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let now = Instant::now();
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// How long since last loop ?
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let nanotime_spent = self.prev_trace_time.elapsed().as_nanos();
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// Diw it go too fast? If so : sleep a bit
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if frame_time > nanotime_spent {
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let nanotime_towait = frame_time - nanotime_spent;
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let dur = Duration::new(0, (nanotime_towait as f32 * 0.9) as u32);
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//debug!( "{:?} - {:?} : {:?}", nanotime_towait, self.prev_trace_time, now);
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thread::sleep(dur);
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//debug!("Framerate OK");
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} else {
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//warn!(
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// "Frame slower than expected {:?} > {:?}",
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// nanotime_spent, frame_time,
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//);
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}
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let time_from_begin = self.start.elapsed().as_nanos() as f64 / 1000000000.;
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self.prev_trace_time = now;
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Ok(time_from_begin)
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}
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}
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