vendor

egui/examples/puffin_profiler/src/main.rs

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+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
+
+use eframe::egui;
+
+fn main() -> Result<(), eframe::Error> {
+    start_puffin_server(); // NOTE: you may only want to call this if the users specifies some flag or clicks a button!
+
+    let options = eframe::NativeOptions::default();
+    eframe::run_native(
+        "My egui App",
+        options,
+        Box::new(|_cc| Box::new(MyApp::default())),
+    )
+}
+
+#[derive(Default)]
+struct MyApp {}
+
+impl eframe::App for MyApp {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading("Example of how to use the puffin profiler with egui");
+            ui.separator();
+
+            let cmd = "cargo install puffin_viewer && puffin_viewer --url 127.0.0.1:8585";
+
+            ui.label("To connect, run this:");
+            ui.horizontal(|ui| {
+                ui.monospace(cmd);
+                if ui.small_button("📋").clicked() {
+                    ui.output_mut(|o| o.copied_text = cmd.into());
+                }
+            });
+
+            ui.separator();
+
+            ui.label("Note that this app runs in 'reactive' mode, so you must interact with the app for new profile events to be sent. Waving the mouse over this window is enough.");
+
+            if ui
+                .button(
+                    "Click to sleep a bit. That should be visible as a spike in the profiler view!",
+                )
+                .clicked()
+            {
+                puffin::profile_scope!("sleep");
+                std::thread::sleep(std::time::Duration::from_millis(50));
+            }
+        });
+    }
+}
+
+fn start_puffin_server() {
+    puffin::set_scopes_on(true); // tell puffin to collect data
+
+    match puffin_http::Server::new("0.0.0.0:8585") {
+        Ok(puffin_server) => {
+            eprintln!("Run:  cargo install puffin_viewer && puffin_viewer --url 127.0.0.1:8585");
+
+            // We can store the server if we want, but in this case we just want
+            // it to keep running. Dropping it closes the server, so let's not drop it!
+            #[allow(clippy::mem_forget)]
+            std::mem::forget(puffin_server);
+        }
+        Err(err) => {
+            eprintln!("Failed to start puffin server: {}", err);
+        }
+    };
+}