notedeck

One damus client to rule them all
git clone git://jb55.com/notedeck
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frame_history.rs (1410B)

      1 /*
      2 use egui::util::History;
      3 
      4 pub struct FrameHistory {
      5     frame_times: History<f32>,
      6 }
      7 
      8 impl Default for FrameHistory {
      9     fn default() -> Self {
     10         let max_age: f32 = 1.0;
     11         let max_len = (max_age * 300.0).round() as usize;
     12         Self {
     13             frame_times: History::new(0..max_len, max_age),
     14         }
     15     }
     16 }
     17 
     18 impl FrameHistory {
     19     // Called first
     20     pub fn on_new_frame(&mut self, now: f64, previous_frame_time: Option<f32>) {
     21         let previous_frame_time = previous_frame_time.unwrap_or_default();
     22         if let Some(latest) = self.frame_times.latest_mut() {
     23             *latest = previous_frame_time; // rewrite history now that we know
     24         }
     25         self.frame_times.add(now, previous_frame_time); // projected
     26     }
     27 
     28     #[allow(unused)]
     29     pub fn mean_frame_time(&self) -> f32 {
     30         self.frame_times.average().unwrap_or_default()
     31     }
     32 
     33     #[allow(unused)]
     34     pub fn fps(&self) -> f32 {
     35         1.0 / self.frame_times.mean_time_interval().unwrap_or_default()
     36     }
     37 
     38     pub fn _ui(&mut self, ui: &mut egui::Ui) {
     39         ui.label(format!(
     40             "Mean CPU usage: {:.2} ms / frame",
     41             1e3 * self.mean_frame_time()
     42         ))
     43         .on_hover_text(
     44             "Includes egui layout and tessellation time.\n\
     45             Does not include GPU usage, nor overhead for sending data to GPU.",
     46         );
     47         egui::warn_if_debug_build(ui);
     48     }
     49 }
     50 */