start in full screen with mouse grabbed

src/main.rs

@@ -1,5 +1,10 @@
 use bevy::{
     asset::LoadState,
+    window::{
+        Window,
+        WindowMode,
+        PrimaryWindow,
+    },
     core_pipeline::Skybox,
     prelude::*,
     render::{
@@ -35,8 +40,17 @@ const CUBEMAPS: &[(&str, CompressedImageFormats)] = &[
     ),
 ];
 
-fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
+fn setup(
+    mut commands: Commands,
+    asset_server: Res<AssetServer>,
+    mut windows: Query<&mut Window, With<PrimaryWindow>>
+) {
     let skybox_handle = asset_server.load(CUBEMAPS[0].0);
+    for mut window in &mut windows {
+        window.cursor.grab_mode = CursorGrabMode::Locked;
+        window.cursor.visible = false;
+        window.mode = WindowMode::Fullscreen;
+    }
     // camera
     commands.spawn((
         Camera3dBundle {
@@ -233,6 +247,7 @@ fn run_camera_controller(
             controller.yaw = yaw;
             controller.pitch = pitch;
             controller.initialized = true;
+            *toggle_cursor_grab = true;
             info!("{}", *controller);
         }
         if !controller.enabled {