can change window settings at runtime (#644)

can change window settings at runtime

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

@@ -56,11 +56,11 @@ 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();
@@ -68,8 +68,8 @@ impl Node for WindowTextureNode {
                 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

@@ -105,7 +105,7 @@ 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()
@@ -116,8 +116,8 @@ 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()
                 },
@@ -189,7 +189,7 @@ 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

@@ -74,9 +74,9 @@ 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/src/window.rs

@@ -33,16 +33,41 @@ 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>,
+    command_queue: Vec<WindowCommand>,
+}
+
+#[derive(Debug)]
+pub enum WindowCommand {
+    SetWindowMode {
+        mode: WindowMode,
+        resolution: (u32, u32),
+    },
+    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 +95,91 @@ impl Window {
             mode: window_descriptor.mode,
             #[cfg(target_arch = "wasm32")]
             canvas: window_descriptor.canvas.clone(),
+            command_queue: Vec::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,
+            resolution: (self.width, self.height),
+        });
+    }
+
+    pub fn drain_commands<'a>(&'a mut self) -> impl Iterator<Item = WindowCommand> + 'a {
+        self.command_queue.drain(..)
+    }
 }
 
 #[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()
+    }
 }

crates/bevy_winit/src/lib.rs

@@ -9,7 +9,7 @@ pub use winit_config::*;
 pub use winit_windows::*;
 
 use bevy_app::{prelude::*, AppExit};
-use bevy_ecs::Resources;
+use bevy_ecs::{IntoThreadLocalSystem, Resources, World};
 use bevy_math::Vec2;
 use bevy_window::{
     CreateWindow, CursorMoved, Window, WindowCloseRequested, WindowCreated, WindowResized, Windows,
@@ -29,7 +29,60 @@ impl Plugin for WinitPlugin {
             // stopping us. there are plans to remove the lifetime: https://github.com/rust-windowing/winit/pull/1456
             // .add_event::<winit::event::WindowEvent>()
             .init_resource::<WinitWindows>()
-            .set_runner(winit_runner);
+            .set_runner(winit_runner)
+            .add_system(change_window.thread_local_system());
+    }
+}
+
+fn change_window(_: &mut World, resources: &mut Resources) {
+    let winit_windows = resources.get::<WinitWindows>().unwrap();
+    let mut windows = resources.get_mut::<Windows>().unwrap();
+
+    for bevy_window in windows.iter_mut() {
+        let id = bevy_window.id();
+        for command in bevy_window.drain_commands() {
+            match command {
+                bevy_window::WindowCommand::SetWindowMode {
+                    mode,
+                    resolution: (width, height),
+                } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    match mode {
+                        bevy_window::WindowMode::BorderlessFullscreen => {
+                            window.set_fullscreen(Some(winit::window::Fullscreen::Borderless(None)))
+                        }
+                        bevy_window::WindowMode::Fullscreen { use_size } => window.set_fullscreen(
+                            Some(winit::window::Fullscreen::Exclusive(match use_size {
+                                true => get_fitting_videomode(
+                                    &window.current_monitor().unwrap(),
+                                    width,
+                                    height,
+                                ),
+                                false => get_best_videomode(&window.current_monitor().unwrap()),
+                            })),
+                        ),
+                        bevy_window::WindowMode::Windowed => window.set_fullscreen(None),
+                    }
+                }
+                bevy_window::WindowCommand::SetTitle { title } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    window.set_title(&title);
+                }
+                bevy_window::WindowCommand::SetResolution { width, height } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    window.set_inner_size(winit::dpi::PhysicalSize::new(width, height));
+                }
+                bevy_window::WindowCommand::SetVsync { .. } => (),
+                bevy_window::WindowCommand::SetResizable { resizable } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    window.set_resizable(resizable);
+                }
+                bevy_window::WindowCommand::SetDecorations { decorations } => {
+                    let window = winit_windows.get_window(id).unwrap();
+                    window.set_decorations(decorations);
+                }
+            }
+        }
     }
 }
 
@@ -118,15 +171,14 @@ pub fn winit_runner(mut app: App) {
                 let winit_windows = app.resources.get_mut::<WinitWindows>().unwrap();
                 let mut windows = app.resources.get_mut::<Windows>().unwrap();
                 let window_id = winit_windows.get_window_id(winit_window_id).unwrap();
-                let mut window = windows.get_mut(window_id).unwrap();
-                window.width = size.width;
-                window.height = size.height;
+                let window = windows.get_mut(window_id).unwrap();
+                window.update_resolution_from_backend(size.width, size.height);
 
                 let mut resize_events = app.resources.get_mut::<Events<WindowResized>>().unwrap();
                 resize_events.send(WindowResized {
                     id: window_id,
-                    height: window.height as usize,
-                    width: window.width as usize,
+                    height: window.height() as usize,
+                    width: window.width() as usize,
                 });
             }
             event::Event::WindowEvent {
@@ -231,7 +283,7 @@ fn handle_create_window_events(
     for create_window_event in create_window_event_reader.iter(&create_window_events) {
         let window = Window::new(create_window_event.id, &create_window_event.descriptor);
         winit_windows.create_window(event_loop, &window);
-        let window_id = window.id;
+        let window_id = window.id();
         windows.add(window);
         window_created_events.send(WindowCreated { id: window_id });
     }

crates/bevy_winit/src/winit_windows.rs

@@ -23,24 +23,31 @@ impl WinitWindows {
         #[cfg(not(target_os = "windows"))]
         let mut winit_window_builder = winit::window::WindowBuilder::new();
 
-        winit_window_builder = match window.mode {
+        winit_window_builder = match window.mode() {
             WindowMode::BorderlessFullscreen => winit_window_builder.with_fullscreen(Some(
                 winit::window::Fullscreen::Borderless(event_loop.primary_monitor()),
             )),
             WindowMode::Fullscreen { use_size } => winit_window_builder.with_fullscreen(Some(
                 winit::window::Fullscreen::Exclusive(match use_size {
-                    true => get_fitting_videomode(&event_loop.primary_monitor().unwrap(), &window),
+                    true => get_fitting_videomode(
+                        &event_loop.primary_monitor().unwrap(),
+                        window.width(),
+                        window.height(),
+                    ),
                     false => get_best_videomode(&event_loop.primary_monitor().unwrap()),
                 }),
             )),
             _ => winit_window_builder
-                .with_inner_size(winit::dpi::PhysicalSize::new(window.width, window.height))
-                .with_resizable(window.resizable)
-                .with_decorations(window.decorations),
+                .with_inner_size(winit::dpi::PhysicalSize::new(
+                    window.width(),
+                    window.height(),
+                ))
+                .with_resizable(window.resizable())
+                .with_decorations(window.decorations()),
         };
 
         #[allow(unused_mut)]
-        let mut winit_window_builder = winit_window_builder.with_title(&window.title);
+        let mut winit_window_builder = winit_window_builder.with_title(window.title());
 
         #[cfg(target_arch = "wasm32")]
         {
@@ -64,8 +71,10 @@ impl WinitWindows {
 
         let winit_window = winit_window_builder.build(&event_loop).unwrap();
 
-        self.window_id_to_winit.insert(window.id, winit_window.id());
-        self.winit_to_window_id.insert(winit_window.id(), window.id);
+        self.window_id_to_winit
+            .insert(window.id(), winit_window.id());
+        self.winit_to_window_id
+            .insert(winit_window.id(), window.id());
 
         #[cfg(target_arch = "wasm32")]
         {
@@ -96,9 +105,10 @@ impl WinitWindows {
         self.winit_to_window_id.get(&id).cloned()
     }
 }
-fn get_fitting_videomode(
+pub fn get_fitting_videomode(
     monitor: &winit::monitor::MonitorHandle,
-    window: &Window,
+    width: u32,
+    height: u32,
 ) -> winit::monitor::VideoMode {
     let mut modes = monitor.video_modes().collect::<Vec<_>>();
 
@@ -111,11 +121,9 @@ fn get_fitting_videomode(
 
     modes.sort_by(|a, b| {
         use std::cmp::Ordering::*;
-        match abs_diff(a.size().width, window.width).cmp(&abs_diff(b.size().width, window.width)) {
+        match abs_diff(a.size().width, width).cmp(&abs_diff(b.size().width, width)) {
             Equal => {
-                match abs_diff(a.size().height, window.height)
-                    .cmp(&abs_diff(b.size().height, window.height))
-                {
+                match abs_diff(a.size().height, height).cmp(&abs_diff(b.size().height, height)) {
                     Equal => b.refresh_rate().cmp(&a.refresh_rate()),
                     default => default,
                 }
@@ -127,7 +135,7 @@ fn get_fitting_videomode(
     modes.first().unwrap().clone()
 }
 
-fn get_best_videomode(monitor: &winit::monitor::MonitorHandle) -> winit::monitor::VideoMode {
+pub fn get_best_videomode(monitor: &winit::monitor::MonitorHandle) -> winit::monitor::VideoMode {
     let mut modes = monitor.video_modes().collect::<Vec<_>>();
     modes.sort_by(|a, b| {
         use std::cmp::Ordering::*;

examples/ecs/parallel_query.rs

@@ -48,11 +48,13 @@ fn bounce_system(
     windows: Res<Windows>,
     mut sprites: Query<(&Transform, &mut Velocity)>,
 ) {
-    let Window { width, height, .. } = windows.get_primary().expect("No primary window");
-    let left = *width as f32 / -2.0;
-    let right = *width as f32 / 2.0;
-    let bottom = *height as f32 / -2.0;
-    let top = *height as f32 / 2.0;
+    let window = windows.get_primary().expect("No primary window");
+    let width = window.width();
+    let height = window.height();
+    let left = width as f32 / -2.0;
+    let right = width as f32 / 2.0;
+    let bottom = height as f32 / -2.0;
+    let top = height as f32 / 2.0;
     sprites
         .iter()
         // Batch size of 32 is chosen to limit the overhead of

examples/window/window_settings.rs

@@ -5,12 +5,22 @@ fn main() {
     App::build()
         .add_resource(WindowDescriptor {
             title: "I am a window!".to_string(),
-            width: 300,
+            width: 500,
             height: 300,
             vsync: true,
             resizable: false,
             ..Default::default()
         })
         .add_default_plugins()
+        .add_system(change_title.system())
         .run();
 }
+
+/// This system will then change the title during execution
+fn change_title(time: Res<Time>, mut windows: ResMut<Windows>) {
+    let window = windows.get_primary_mut().unwrap();
+    window.set_title(format!(
+        "Seconds since startup: {}",
+        time.seconds_since_startup.round()
+    ));
+}