disable mesh shading

src/main.rs

@@ -207,6 +207,7 @@ struct RenderContext {
     previous_frame_end: Option<Box<dyn GpuFuture>>,
     gui:                Gui,
     render_start:       Instant,
+    new_object_start:   Option<Instant>,
 }
 
 fn app_version() -> Version {
@@ -305,7 +306,7 @@ impl App {
 
         let mut device_extensions = DeviceExtensions {
             khr_swapchain: true,
-            ext_mesh_shader: true,
+            ext_mesh_shader: false,
             khr_fragment_shading_rate: true,
             ..DeviceExtensions::empty()
         };
@@ -762,6 +763,7 @@ impl ApplicationHandler for App {
             previous_frame_end,
             gui,
             render_start: Instant::now(),
+            new_object_start: None,
         });
     }
 
@@ -847,7 +849,8 @@ impl ApplicationHandler for App {
                             rot:   Vec3::ZERO,
                             scale: Vec3::ONE,
                         };
-                        self.rcx.as_mut().unwrap().recreate_shaders = true;
+                        let rcx = self.rcx.as_mut().unwrap();
+                        rcx.recreate_shaders = true;
                     },
                     _ => {},
                 },
@@ -912,6 +915,7 @@ impl App {
         }
 
         if rcx.recreate_shaders {
+            rcx.new_object_start = Some(Instant::now());
             let new_module = self.gstate.csg[0]
                 .parts
                 .compile_to_spirv(Some(self.base_module.clone()));
@@ -953,6 +957,14 @@ impl App {
                 },
             );
             rcx.recreate_pipelines = false;
+            if (rcx.new_object_start.is_some()) {
+                let end = Instant::now();
+                info!(
+                    "Object recreation took {} milliseconds",
+                    (end - rcx.new_object_start.unwrap()).as_secs_f64() * 1000.0
+                );
+                rcx.new_object_start = None;
+            }
         }
 
         let (mut push_constants, cam_set) = {