feat(engine): add scale factor to Window struct

2 files changed, 44 insertions, 2 deletions

diff --git a/engine/src/windowing.rs b/engine/src/windowing.rs
index 69adae9..2bfdb31 100644
--- a/engine/src/windowing.rs
+++ b/engine/src/windowing.rs
@@ -195,6 +195,29 @@ fn update_stuff(
 
                 actions.remove_comps::<(Window,)>(*window_ent_id);
             }
+            MessageFromApp::WindowScaleFactorChanged(window_id, scale_factor) => {
+                let Some(window_ent_id) =
+                    windows.get(&window_id).map(|(_, ent_id)| ent_id)
+                else {
+                    tracing::error!(
+                        wid = ?window_id,
+                        "Window does not exist in windowing context"
+                    );
+                    continue;
+                };
+
+                let Some(window_ent) = entity_obtainer.get_entity(*window_ent_id) else {
+                    continue;
+                };
+
+                let Some(mut window) = window_ent.get_mut::<Window>() else {
+                    continue;
+                };
+
+                window.set_scale_factor(scale_factor);
+
+                window.set_changed();
+            }
             MessageFromApp::KeyboardKeyStateChanged(key, key_state) => {
                 keyboard.set_key_state(key, key_state);
             }
@@ -405,6 +428,7 @@ enum MessageFromApp
     WindowCreated(Uid, Arc<WinitWindow>, WindowCreationAttributes),
     WindowResized(WindowId, Dimens<u32>),
     WindowCloseRequested(WindowId),
+    WindowScaleFactorChanged(WindowId, f64),
     KeyboardKeyStateChanged(Key, KeyState),
     MouseMoved
     {
@@ -605,6 +629,12 @@ impl ApplicationHandler for App
                     self.focused_window_id = None;
                 }
             }
+            WindowEvent::ScaleFactorChanged { scale_factor, inner_size_writer: _ } => {
+                self.send_message(MessageFromApp::WindowScaleFactorChanged(
+                    WindowId::from_inner(window_id),
+                    scale_factor,
+                ));
+            }
             _ => {}
         }
     }
diff --git a/engine/src/windowing/window.rs b/engine/src/windowing/window.rs
index 79b2102..627bdec 100644
--- a/engine/src/windowing/window.rs
+++ b/engine/src/windowing/window.rs
@@ -87,11 +87,12 @@ pub struct CreationReady;
 #[non_exhaustive]
 pub struct Window
 {
-    wid: Id,
     pub title: Cow<'static, str>,
     pub cursor_visible: bool,
     pub cursor_grab_mode: CursorGrabMode,
+    wid: Id,
     inner_size: Dimens<u32>,
+    scale_factor: f64,
 }
 
 impl Window
@@ -106,17 +107,23 @@ impl Window
         &self.inner_size
     }
 
+    pub fn scale_factor(&self) -> f64
+    {
+        self.scale_factor
+    }
+
     pub(crate) fn new(
         winit_window: &winit::window::Window,
         creation_attrs: &CreationAttributes,
     ) -> Self
     {
         Self {
-            wid: Id::from_inner(winit_window.id()),
             title: creation_attrs.title().to_string().into(),
             cursor_visible: true,
             cursor_grab_mode: CursorGrabMode::None,
+            wid: Id::from_inner(winit_window.id()),
             inner_size: winit_window.inner_size().into(),
+            scale_factor: winit_window.scale_factor(),
         }
     }
 
@@ -130,6 +137,11 @@ impl Window
     {
         self.inner_size = inner_size;
     }
+
+    pub(crate) fn set_scale_factor(&mut self, scale_factor: f64)
+    {
+        self.scale_factor = scale_factor;
+    }
 }
 
 #[derive(Debug, Component)]