feat(topola-egui): Add checkbox to toggle fixing of step rate

crates/topola-egui/src/actions.rs

@@ -373,6 +373,7 @@ pub struct DebugActions {
     pub show_topo_navmesh: Switch,
     pub show_bboxes: Switch,
     pub show_primitive_indices: Switch,
+    pub fix_update_timestep: Switch,
 }
 
 impl DebugActions {
@@ -402,6 +403,8 @@ impl DebugActions {
                 tr.text("tr-menu-debug-show-primitive-indices"),
             )
             .into_switch(),
+            fix_update_timestep: Action::new_keyless(tr.text("tr-menu-debug-fix-step-rate"))
+                .into_switch(),
         }
     }
 
@@ -422,6 +425,11 @@ impl DebugActions {
         self.show_bboxes.checkbox(ui, &mut menu_bar.show_bboxes);
         self.show_primitive_indices
             .checkbox(ui, &mut menu_bar.show_primitive_indices);
+
+        ui.separator();
+
+        self.fix_update_timestep
+            .checkbox(ui, &mut menu_bar.fix_step_rate);
     }
 }
 

crates/topola-egui/src/menu_bar.rs

@@ -40,6 +40,7 @@ pub struct MenuBar {
     pub show_origin_destination: bool,
     pub show_primitive_indices: bool,
     pub show_appearance_panel: bool,
+    pub fix_step_rate: bool,
     pub update_timestep: f32,
 }
 
@@ -74,7 +75,8 @@ impl MenuBar {
             show_origin_destination: false,
             show_primitive_indices: false,
             show_appearance_panel: true,
-            update_timestep: 0.1,
+            fix_step_rate: false,
+            update_timestep: 0.25,
         }
     }
 
@@ -167,21 +169,14 @@ impl MenuBar {
                     ui.menu_button(tr.text("tr-menu-debug"), |ui| {
                         actions.debug.render_menu(ctx, ui, self);
 
-                        ui.separator();
-
-                        ui.label(tr.text("tr-menu-debug-frame-timestep"));
+                        ui.add_enabled_ui(self.fix_step_rate, |ui| {
+                            ui.label(tr.text("tr-menu-debug-update-timestep"));
                             ui.add(
-                            // NOTE: Frame timestep slider's minimal value
-                            // should not go down to zero seconds because this
-                            // will leave no time for the GUI to update until
-                            // the currently performed action finishes, which
-                            // may leave the GUI unresponsive during that time,
-                            // or even freeze the application if the action
-                            // fails to end in reasonable time.
-                            egui::widgets::Slider::new(&mut self.update_timestep, 0.001..=3.0)
+                                egui::widgets::Slider::new(&mut self.update_timestep, 0.01..=3.0)
                                     .suffix(" s"),
                             );
                         });
+                    });
 
                     ui.menu_button(tr.text("tr-menu-help"), |ui| {
                         actions.help.render_menu(ctx, ui, online_documentation_url)

crates/topola-egui/src/viewport.rs

@@ -69,7 +69,7 @@ impl Viewport {
                         workspace.advance_state_by_dt(
                             tr,
                             error_dialog,
-                            menu_bar.update_timestep,
+                            menu_bar.fix_step_rate.then_some(menu_bar.update_timestep),
                             &interactive_input,
                         );
 

crates/topola-egui/src/workspace.rs

@@ -76,14 +76,21 @@ impl Workspace {
         &mut self,
         tr: &Translator,
         error_dialog: &mut ErrorDialog,
-        frame_timestep: f32,
+        maybe_update_timestep: Option<f32>,
         interactive_input: &InteractiveInput,
     ) -> bool {
         let instant = Instant::now();
 
+        if maybe_update_timestep.is_some() {
             self.update_counter += interactive_input.dt;
-        while self.update_counter >= frame_timestep {
-            self.update_counter -= frame_timestep;
+        }
+
+        while maybe_update_timestep
+            .is_none_or(|update_timestep| self.update_counter >= update_timestep)
+        {
+            if let Some(update_timestep) = maybe_update_timestep {
+                self.update_counter -= update_timestep;
+            }
 
             if let ControlFlow::Break(()) = self.update_state(tr, error_dialog, interactive_input) {
                 return true;

locales/en-US/main.ftl

@@ -46,6 +46,7 @@ tr-menu-debug-show-pathfinding-scores = Show Pathfinding Scores
 tr-menu-debug-show-topo-navmesh = Show Topological Navmesh
 tr-menu-debug-show-bboxes = Show BBoxes
 tr-menu-debug-show-primitive-indices = Show Primitive Indices
+tr-menu-debug-fix-step-rate = Fix Step Rate
 tr-menu-debug-update-timestep = Update Timestep
 
 tr-menu-help = Help