Add resizable flag and windowmode option to window creation

crates/bevy_window/src/window.rs

@@ -34,6 +34,20 @@ pub struct Window {
     pub height: u32,
     pub title: String,
     pub vsync: bool,
+    pub resizable: bool,
+    pub mode: WindowMode,
+}
+
+/// Defines the way a window is displayed
+/// The use_size option that is used in the Fullscreen variant
+/// defines whether a videomode is chosen that best fits the width and height
+/// in the Window structure, or if these are ignored.
+/// E.g. when use_size is set to false the best video mode possible is chosen.
+#[derive(Debug, Clone, Copy)]
+pub enum WindowMode {
+    Windowed,
+    BorderlessFullscreen,
+    Fullscreen { use_size: bool },
 }
 
 impl Window {
@@ -44,6 +58,8 @@ impl Window {
             width: window_descriptor.width,
             title: window_descriptor.title.clone(),
             vsync: window_descriptor.vsync,
+            resizable: window_descriptor.resizable,
+            mode: window_descriptor.mode,
         }
     }
 }
@@ -54,6 +70,8 @@ pub struct WindowDescriptor {
     pub height: u32,
     pub title: String,
     pub vsync: bool,
+    pub resizable: bool,
+    pub mode: WindowMode,
 }
 
 impl Default for WindowDescriptor {
@@ -63,6 +81,8 @@ impl Default for WindowDescriptor {
             width: 1280,
             height: 720,
             vsync: true,
+            resizable: true,
+            mode: WindowMode::Windowed,
         }
     }
 }

crates/bevy_winit/src/winit_windows.rs

@@ -1,4 +1,4 @@
-use bevy_window::{Window, WindowId};
+use bevy_window::{Window, WindowId, WindowMode};
 use std::collections::HashMap;
 
 #[derive(Default)]
@@ -15,18 +15,31 @@ impl WinitWindows {
         window: &Window,
     ) {
         #[cfg(target_os = "windows")]
-        let winit_window_builder = {
+        let mut winit_window_builder = {
             use winit::platform::windows::WindowBuilderExtWindows;
-            winit::window::WindowBuilder::new()
-                .with_drag_and_drop(false)
+            winit::window::WindowBuilder::new().with_drag_and_drop(false)
         };
 
         #[cfg(not(target_os = "windows"))]
-        let winit_window_builder = winit::window::WindowBuilder::new();
+        let mut winit_window_builder = winit::window::WindowBuilder::new();
+
+        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(), &window),
+                    false => get_best_videomode(&event_loop.primary_monitor()),
+                }),
+            )),
+            _ => winit_window_builder
+                .with_inner_size(winit::dpi::PhysicalSize::new(window.width, window.height))
+                .with_resizable(window.resizable),
+        };
 
         let winit_window = winit_window_builder
             .with_title(&window.title)
-            .with_inner_size(winit::dpi::PhysicalSize::new(window.width, window.height))
             .build(&event_loop)
             .unwrap();
 
@@ -46,3 +59,49 @@ impl WinitWindows {
         self.winit_to_window_id.get(&id).cloned()
     }
 }
+fn get_fitting_videomode(
+    monitor: &winit::monitor::MonitorHandle,
+    window: &Window,
+) -> winit::monitor::VideoMode {
+    let mut modes = monitor.video_modes().collect::<Vec<_>>();
+
+    fn abs_diff(a: u32, b: u32) -> u32 {
+        if a > b {
+            return a - b;
+        }
+        b - a
+    }
+
+    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)) {
+            Equal => {
+                match abs_diff(a.size().height, window.height)
+                    .cmp(&abs_diff(b.size().height, window.height))
+                {
+                    Equal => b.refresh_rate().cmp(&a.refresh_rate()),
+                    default => default,
+                }
+            }
+            default => default,
+        }
+    });
+
+    modes.first().unwrap().clone()
+}
+
+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::*;
+        match b.size().width.cmp(&a.size().width) {
+            Equal => match b.size().height.cmp(&a.size().height) {
+                Equal => b.refresh_rate().cmp(&a.refresh_rate()),
+                default => default,
+            },
+            default => default,
+        }
+    });
+
+    modes.first().unwrap().clone()
+}

examples/window/multiple_windows.rs

@@ -39,6 +39,7 @@ fn setup(
             height: 600,
             vsync: false,
             title: "second window".to_string(),
+            ..Default::default()
         },
     });
 

examples/window/window_settings.rs

@@ -1,4 +1,5 @@
 use bevy::prelude::*;
+use bevy_window::WindowMode;
 
 /// This example illustrates how to customize the default window settings
 fn main() {
@@ -8,6 +9,9 @@ fn main() {
             width: 300,
             height: 300,
             vsync: true,
+            resizable: false,
+            mode: WindowMode::Fullscreen { use_size: false },
+            ..Default::default()
         })
         .add_default_plugins()
         .run();