show average fps on console

src/main.rs

@@ -111,6 +111,9 @@ async fn main() {
     let mut last_tap = std::time::Instant::now();
     let mut z = 0;
 
+    let mut frame_count = 0;
+    let mut fps_sum_window = std::time::Instant::now();
+
     let mut active = false;
 
     for i in 0..5 {
@@ -119,9 +122,18 @@ async fn main() {
 
     event_loop.run(move |event, elwt| {
         let tcur = std::time::Instant::now();
+        if (tcur - fps_sum_window).as_millis() > 5000 {
+            let avg_fps = (1000.0 * frame_count as f32) / ((tcur - fps_sum_window).as_millis() as f32);
+            eprintln!("avg fps: {}", avg_fps);
+            fps_sum_window = tcur;
+            frame_count = 0;
+        } else {
+            frame_count += 1;
+        }
+
         elwt.set_control_flow(ControlFlow::
                               WaitUntil(
-            tcur + Duration::from_millis(100)
+            tcur + Duration::from_millis(25)
         ));
         inputs.write().unwrap().t = tcur - tbegin;
         inputs.write().unwrap().transition_time = tcur - transition_begin;
@@ -237,12 +249,12 @@ async fn main() {
                             eprintln!("--------------");
                             }
                         }
-                        _ => {}
+                            _ => {}
+                        }
                     }
                 }
-            }
 
-            _ => {}
+                _ => {}
         }
 
         let (width, height) = *dim.lock().unwrap();