Fps counter

examples/cube.rs

@@ -1,34 +1,74 @@
 pub mod components;
 
+use std::sync::{Arc, Mutex};
+
 use osmium::{renderer::Point, terminal};
 
 fn main() {
     let engine = osmium::init();
 
-    engine.entity(|r| {
-        r.draw_vertex(
-            0,
-            0,
-            &[
-                Point { x: 0, y: 0 },
-                Point { x: 30, y: 0 },
-                Point { x: 15, y: 8 },
-            ],
-            0x0000ff,
-        );
+    let last_frame = Arc::new(Mutex::new(std::time::Instant::now()));
+    let peak: Arc<Mutex<u32>> = Arc::new(Mutex::new(0));
+    let low: Arc<Mutex<u32>> = Arc::new(Mutex::new(1000));
 
-        r.draw_vertex_outline(
-            0,
-            0,
-            &[
-                Point { x: 0, y: 0 },
-                Point { x: 30, y: 0 },
-                Point { x: 15, y: 8 },
-            ],
-            0xff0000,
-        );
+    engine.entity(move |r| {
+        let current_frame = std::time::Instant::now();
+        let since = current_frame
+            .duration_since(last_frame.lock().unwrap().clone())
+            .as_millis();
+
+        if since > 0 {
+            let fps: u32 = 1000 / since as u32;
+
+            r.draw_text(
+                0,
+                0,
+                format!("{fps}\n{}\n{}", peak.lock().unwrap(), low.lock().unwrap()),
+            );
+
+            {
+                let mut peak = peak.lock().unwrap();
+                let mut low = low.lock().unwrap();
+
+                if fps > *peak {
+                    *peak = fps;
+                }
+
+                if fps < *low {
+                    *low = fps;
+                }
+            }
+        }
+
+        *last_frame.lock().unwrap() = current_frame;
     });
 
+    engine
+        .entity(|r| {
+            r.draw_vertex(
+                0,
+                0,
+                &[
+                    Point { x: 0, y: 0 },
+                    Point { x: 30, y: 0 },
+                    Point { x: 15, y: 8 },
+                ],
+                0x0000ff,
+            );
+
+            r.draw_vertex_outline(
+                0,
+                0,
+                &[
+                    Point { x: 0, y: 0 },
+                    Point { x: 30, y: 0 },
+                    Point { x: 15, y: 8 },
+                ],
+                0xff0000,
+            );
+        })
+        .set_position(20, 0);
+
     terminal::hide_cursor().unwrap();
 
     engine.start();

src/lib.rs

@@ -99,7 +99,7 @@ impl Engine {
 
         loop {
             self.render();
-            sleep(160);
+            sleep(16);
         }
     }
 }

src/renderer.rs

@@ -19,6 +19,16 @@ impl Renderer {
         }
     }
 
+    pub fn draw_text<T: std::fmt::Display>(&mut self, x: u16, y: u16, text: T) {
+        write_liner(
+            &mut self.buf,
+            self.pos.x + x,
+            self.pos.y + y,
+            "",
+            &text.to_string(),
+        );
+    }
+
     pub fn draw_rect(&mut self, x: u16, y: u16, width: u16, height: u16, color: u32) {
         let rl = " ".repeat(width as usize) + "\x1b[0m";
         let rect = (rl + "\n").repeat(height as usize);