camera: update cameras when windows are created

crates/bevy_render/src/camera/camera.rs

@@ -1,7 +1,7 @@
 use crate::CameraProjection;
 use bevy_app::{EventReader, Events};
 use bevy_property::Properties;
-use bevy_window::WindowResized;
+use bevy_window::{WindowCreated, WindowResized, Windows};
 use glam::Mat4;
 use legion::{prelude::*, storage::Component};
 
@@ -15,11 +15,27 @@ pub fn camera_system<T: CameraProjection + Component>(
     _resources: &mut Resources,
 ) -> Box<dyn Schedulable> {
     let mut window_resized_event_reader = EventReader::<WindowResized>::default();
+    let mut window_created_event_reader = EventReader::<WindowCreated>::default();
     (move |world: &mut SubWorld,
            window_resized_events: Res<Events<WindowResized>>,
+           window_created_events: Res<Events<WindowCreated>>,
+           windows: Res<Windows>,
            query: &mut Query<(Write<Camera>, Write<T>)>| {
         let primary_window_resized_event = window_resized_event_reader
             .find_latest(&window_resized_events, |event| event.is_primary);
+
+        for event in window_created_event_reader.iter(&window_created_events) {
+            if !event.is_primary {
+                continue;
+            }
+            if let Some(window) = windows.get(event.id) {
+                for (mut camera, mut camera_projection) in query.iter_mut(world) {
+                    camera_projection.update(window.width as usize, window.height as usize);
+                    camera.view_matrix = camera_projection.get_view_matrix();
+                }
+            }
+        }
+
         if let Some(primary_window_resized_event) = primary_window_resized_event {
             for (mut camera, mut camera_projection) in query.iter_mut(world) {
                 camera_projection.update(

crates/bevy_window/src/window.rs

@@ -14,6 +14,7 @@ impl WindowId {
     }
 }
 
+#[derive(Debug)]
 pub struct Window {
     pub id: WindowId,
     pub width: u32,