performance counters

src/game/components.rs

@@ -1,4 +1,4 @@
-use crate::{input::InputState, text::update_text, vulkan::{VulkanRenderer, gameobject::{GameObject, GameObjectHandle, Updatable}}};
+use crate::{input::InputState, text::update_text, vulkan::{PERF_COUNTER_SIZE, VulkanRenderer, gameobject::{GameObject, GameObjectHandle, Updatable}}};
 
 use super::GameState;
 
@@ -7,8 +7,12 @@ pub struct FpsCounter {
 }
 
 impl Updatable for FpsCounter {
-    fn update(&mut self, delta_time: f32, _input: &InputState, game_state: &mut GameState, game_objects: &mut Vec<GameObject>, renderer: &mut VulkanRenderer) {
-        let text = format!("{}ms\n{}fps", delta_time * 1000., 1. / delta_time);
+    fn update(&mut self, _delta_time: f32, _input: &InputState, game_state: &mut GameState, game_objects: &mut Vec<GameObject>, renderer: &mut VulkanRenderer) {
+        let update_duration = renderer.game_data.update_perf_counters.iter().sum::<u128>() / PERF_COUNTER_SIZE as u128;
+        let render_duration = renderer.game_data.render_perf_counters.iter().sum::<u128>() / PERF_COUNTER_SIZE as u128;
+        let other_duration = renderer.game_data.other_perf_counters.iter().sum::<u128>() / PERF_COUNTER_SIZE as u128;
+        let other_variance = renderer.game_data.other_perf_counters.iter().fold(0, |acc, b| acc + (*b as i128 - other_duration as i128) * (*b as i128 - other_duration as i128)) / PERF_COUNTER_SIZE as i128;
+        let text = format!("Update: {:.0}ms\nRender: {:.0}ms\nTotal: {:.0}ms (±{:.1})\nDelta: {:.0}ms", update_duration as f64 / 1000., render_duration as f64 / 1000., other_duration as f64 / 1000., f64::sqrt(other_variance as f64) / 1000., _delta_time * 1000.);
         update_text(self.game_object, &text, 30., renderer, &mut game_state.brush, game_objects)
     }
 }