Profiling support (#743)

src_testbed/ui.rs

@@ -21,6 +21,41 @@ pub fn update_ui(
     harness: &mut Harness,
     debug_render: &mut DebugRenderPipelineResource,
 ) {
+    #[cfg(feature = "profiling")]
+    {
+        let window = egui::Window::new("Profiling");
+        let window = window.default_open(false);
+
+        #[cfg(feature = "unstable-puffin-pr-235")]
+        {
+            use std::sync::Once;
+            static START: Once = Once::new();
+
+            fn set_default_rapier_filter() {
+                let mut profile_ui = puffin_egui::PROFILE_UI.lock();
+                profile_ui
+                    .profiler_ui
+                    .flamegraph_options
+                    .scope_name_filter
+                    .set_filter("Harness::step_with_graphics".to_string());
+            }
+            START.call_once(|| {
+                set_default_rapier_filter();
+            });
+            window.show(ui_context.ctx_mut(), |ui| {
+                if ui.button("🔍 Rapier filter").clicked() {
+                    set_default_rapier_filter();
+                }
+                puffin_egui::profiler_ui(ui);
+            });
+        }
+
+        #[cfg(not(feature = "unstable-puffin-pr-235"))]
+        window.show(ui_context.ctx_mut(), |ui| {
+            puffin_egui::profiler_ui(ui);
+        });
+    }
+
     egui::Window::new("Parameters").show(ui_context.ctx_mut(), |ui| {
         if state.backend_names.len() > 1 && !state.example_names.is_empty() {
             let mut changed = false;