can change window settings at runtime

Cargo.toml

@@ -274,6 +274,10 @@ path = "examples/window/multiple_windows.rs"
 name = "window_settings"
 path = "examples/window/window_settings.rs"
 
+[[example]]
+name = "change_window_settings"
+path = "examples/window/change_window_settings.rs"
+
 [[example]]
 name = "hello_wasm"
 path = "examples/wasm/hello_wasm.rs"

crates/bevy_render/src/camera/camera.rs

@@ -74,8 +74,8 @@ pub fn camera_system<T: CameraProjection + Component>(
     }
     for (entity, mut camera, mut camera_projection) in &mut query.iter() {
         if let Some(window) = windows.get(camera.window) {
-            if changed_window_ids.contains(&window.id) || added_cameras.contains(&entity) {
-                camera_projection.update(window.width as usize, window.height as usize);
+            if changed_window_ids.contains(&window.id()) || added_cameras.contains(&entity) {
+                camera_projection.update(window.width() as usize, window.height() as usize);
                 camera.projection_matrix = camera_projection.get_projection_matrix();
                 camera.depth_calculation = camera_projection.depth_calculation();
             }

crates/bevy_render/src/render_graph/nodes/window_swapchain_node.rs

@@ -56,11 +56,11 @@ impl Node for WindowSwapChainNode {
         // create window swapchain when window is resized or created
         if self
             .window_created_event_reader
-            .find_latest(&window_created_events, |e| e.id == window.id)
+            .find_latest(&window_created_events, |e| e.id == window.id())
             .is_some()
             || self
                 .window_resized_event_reader
-                .find_latest(&window_resized_events, |e| e.id == window.id)
+                .find_latest(&window_resized_events, |e| e.id == window.id())
                 .is_some()
         {
             render_resource_context.create_swap_chain(window);

crates/bevy_render/src/render_graph/nodes/window_texture_node.rs

@@ -56,20 +56,20 @@ impl Node for WindowTextureNode {
 
         if self
             .window_created_event_reader
-            .find_latest(&window_created_events, |e| e.id == window.id)
+            .find_latest(&window_created_events, |e| e.id == window.id())
             .is_some()
             || self
                 .window_resized_event_reader
-                .find_latest(&window_resized_events, |e| e.id == window.id)
+                .find_latest(&window_resized_events, |e| e.id == window.id())
                 .is_some()
         {
             let render_resource_context = render_context.resources_mut();
             if let Some(RenderResourceId::Texture(old_texture)) = output.get(WINDOW_TEXTURE) {
                 render_resource_context.remove_texture(old_texture);
             }
 
-            self.descriptor.size.width = window.width;
-            self.descriptor.size.height = window.height;
+            self.descriptor.size.width = window.width();
+            self.descriptor.size.height = window.height();
             let texture_resource = render_resource_context.create_texture(self.descriptor);
             output.set(WINDOW_TEXTURE, RenderResourceId::Texture(texture_resource));
         }

crates/bevy_ui/src/flex/mod.rs

@@ -95,7 +95,7 @@ impl FlexSurface {
 
     pub fn update_window(&mut self, window: &Window) {
         let stretch = &mut self.stretch;
-        let node = self.window_nodes.entry(window.id).or_insert_with(|| {
+        let node = self.window_nodes.entry(window.id()).or_insert_with(|| {
             stretch
                 .new_node(stretch::style::Style::default(), Vec::new())
                 .unwrap()
@@ -106,8 +106,8 @@ impl FlexSurface {
                 *node,
                 stretch::style::Style {
                     size: stretch::geometry::Size {
-                        width: stretch::style::Dimension::Points(window.width as f32),
-                        height: stretch::style::Dimension::Points(window.height as f32),
+                        width: stretch::style::Dimension::Points(window.width() as f32),
+                        height: stretch::style::Dimension::Points(window.height() as f32),
                     },
                     ..Default::default()
                 },
@@ -179,7 +179,7 @@ pub fn flex_node_system(
 
     // update window children (for now assuming all Nodes live in the primary window)
     if let Some(primary_window) = windows.get_primary() {
-        flex_surface.set_window_children(primary_window.id, root_node_query.iter().iter());
+        flex_surface.set_window_children(primary_window.id(), root_node_query.iter().iter());
     }
 
     // update children

crates/bevy_wgpu/src/renderer/wgpu_render_resource_context.rs

@@ -274,22 +274,25 @@ impl RenderResourceContext for WgpuRenderResourceContext {
 
         let swap_chain_descriptor: wgpu::SwapChainDescriptor = window.wgpu_into();
         let surface = surfaces
-            .get(&window.id)
+            .get(&window.id())
             .expect("No surface found for window");
         let swap_chain = self
             .device
             .create_swap_chain(surface, &swap_chain_descriptor);
 
-        window_swap_chains.insert(window.id, swap_chain);
+        window_swap_chains.insert(window.id(), swap_chain);
     }
 
     fn next_swap_chain_texture(&self, window: &bevy_window::Window) -> TextureId {
-        if let Some(texture_id) = self.try_next_swap_chain_texture(window.id) {
+        if let Some(texture_id) = self.try_next_swap_chain_texture(window.id()) {
             texture_id
         } else {
-            self.resources.window_swap_chains.write().remove(&window.id);
+            self.resources
+                .window_swap_chains
+                .write()
+                .remove(&window.id());
             self.create_swap_chain(window);
-            self.try_next_swap_chain_texture(window.id)
+            self.try_next_swap_chain_texture(window.id())
                 .expect("Failed to acquire next swap chain texture!")
         }
     }

crates/bevy_wgpu/src/wgpu_renderer.rs

@@ -73,9 +73,9 @@ impl WgpuRenderer {
             #[cfg(feature = "bevy_winit")]
             {
                 let winit_windows = resources.get::<bevy_winit::WinitWindows>().unwrap();
-                let winit_window = winit_windows.get_window(window.id).unwrap();
+                let winit_window = winit_windows.get_window(window.id()).unwrap();
                 let surface = unsafe { self.instance.create_surface(winit_window.deref()) };
-                render_resource_context.set_window_surface(window.id, surface);
+                render_resource_context.set_window_surface(window.id(), surface);
             }
         }
     }

crates/bevy_wgpu/src/wgpu_type_converter.rs

@@ -563,9 +563,9 @@ impl WgpuFrom<&Window> for wgpu::SwapChainDescriptor {
         wgpu::SwapChainDescriptor {
             usage: wgpu::TextureUsage::OUTPUT_ATTACHMENT,
             format: wgpu::TextureFormat::Bgra8UnormSrgb,
-            width: window.width,
-            height: window.height,
-            present_mode: if window.vsync {
+            width: window.width(),
+            height: window.height(),
+            present_mode: if window.vsync() {
                 wgpu::PresentMode::Fifo
             } else {
                 wgpu::PresentMode::Immediate

crates/bevy_window/Cargo.toml

@@ -21,6 +21,7 @@ bevy_utils = { path = "../bevy_utils", version = "0.2.1" }
 
 # other
 uuid = { version = "0.8", features = ["v4", "serde"] }
+smallvec = { version = "1.4", features = ["serde"] }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 uuid = { version = "0.8", features = ["wasm-bindgen"] }

crates/bevy_window/src/window.rs

@@ -1,3 +1,4 @@
+use smallvec::SmallVec;
 use uuid::Uuid;
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
@@ -33,16 +34,28 @@ impl Default for WindowId {
 
 #[derive(Debug)]
 pub struct Window {
-    pub id: WindowId,
-    pub width: u32,
-    pub height: u32,
-    pub title: String,
-    pub vsync: bool,
-    pub resizable: bool,
-    pub decorations: bool,
-    pub mode: WindowMode,
+    id: WindowId,
+    width: u32,
+    height: u32,
+    title: String,
+    vsync: bool,
+    resizable: bool,
+    decorations: bool,
+    mode: WindowMode,
     #[cfg(target_arch = "wasm32")]
     pub canvas: Option<String>,
+    #[doc(hidden)]
+    pub command_queue: SmallVec<[WindowCommand; 4]>,
+}
+
+#[derive(Debug)]
+pub enum WindowCommand {
+    SetWindowMode { mode: WindowMode },
+    SetTitle { title: String },
+    SetResolution { width: u32, height: u32 },
+    SetVsync { vsync: bool },
+    SetResizable { resizable: bool },
+    SetDecorations { decorations: bool },
 }
 
 /// Defines the way a window is displayed
@@ -70,8 +83,85 @@ impl Window {
             mode: window_descriptor.mode,
             #[cfg(target_arch = "wasm32")]
             canvas: window_descriptor.canvas.clone(),
+            command_queue: SmallVec::new(),
         }
     }
+
+    #[inline]
+    pub fn id(&self) -> WindowId {
+        self.id
+    }
+
+    #[inline]
+    pub fn width(&self) -> u32 {
+        self.width
+    }
+
+    #[inline]
+    pub fn height(&self) -> u32 {
+        self.height
+    }
+
+    pub fn set_resolution(&mut self, width: u32, height: u32) {
+        self.width = width;
+        self.height = height;
+        self.command_queue
+            .push(WindowCommand::SetResolution { width, height });
+    }
+
+    #[doc(hidden)]
+    pub fn update_resolution_from_backend(&mut self, width: u32, height: u32) {
+        self.width = width;
+        self.height = height;
+    }
+
+    pub fn title(&'_ self) -> &'_ str {
+        &self.title
+    }
+
+    pub fn set_title(&mut self, title: String) {
+        self.title = title.to_string();
+        self.command_queue.push(WindowCommand::SetTitle { title });
+    }
+
+    pub fn vsync(&self) -> bool {
+        self.vsync
+    }
+
+    pub fn set_vsync(&mut self, vsync: bool) {
+        self.vsync = vsync;
+        self.command_queue.push(WindowCommand::SetVsync { vsync });
+    }
+
+    pub fn resizable(&self) -> bool {
+        self.resizable
+    }
+
+    pub fn set_resizable(&mut self, resizable: bool) {
+        self.resizable = resizable;
+        self.command_queue
+            .push(WindowCommand::SetResizable { resizable });
+    }
+
+    pub fn decorations(&self) -> bool {
+        self.decorations
+    }
+
+    pub fn set_decorations(&mut self, decorations: bool) {
+        self.decorations = decorations;
+        self.command_queue
+            .push(WindowCommand::SetDecorations { decorations });
+    }
+
+    pub fn mode(&self) -> WindowMode {
+        self.mode
+    }
+
+    pub fn set_mode(&mut self, mode: WindowMode) {
+        self.mode = mode;
+        self.command_queue
+            .push(WindowCommand::SetWindowMode { mode });
+    }
 }
 
 #[derive(Debug, Clone)]

crates/bevy_window/src/windows.rs

@@ -8,7 +8,7 @@ pub struct Windows {
 
 impl Windows {
     pub fn add(&mut self, window: Window) {
-        self.windows.insert(window.id, window);
+        self.windows.insert(window.id(), window);
     }
 
     pub fn get(&self, id: WindowId) -> Option<&Window> {
@@ -23,7 +23,15 @@ impl Windows {
         self.get(WindowId::primary())
     }
 
+    pub fn get_primary_mut(&mut self) -> Option<&mut Window> {
+        self.get_mut(WindowId::primary())
+    }
+
     pub fn iter(&self) -> impl Iterator<Item = &Window> {
         self.windows.values()
     }
+
+    pub fn iter_mut(&mut self) -> impl Iterator<Item = &mut Window> {
+        self.windows.values_mut()
+    }
 }