Add exclusive fullscreen mode (#925)

* Add exclusive fullscreen mode

* Add `WindowExtMacOS::set_fullscreen_presentation_options`

* Capture display for exclusive fullscreen on macOS

* Fix applying video mode on macOS after a fullscreen cycle

* Fix compilation on iOS

* Set monitor appropriately for fullscreen on macOS

* Fix exclusive to borderless fullscreen transitions on macOS

* Fix borderless to exclusive fullscreen transition on macOS

* Sort video modes on Windows

* Fix fullscreen issues on Windows

* Fix video mode changes during exclusive fullscreen on Windows

* Add video mode sorting for macOS and iOS

* Fix monitor `ns_screen` returning `None` after video mode change

* Fix "multithreaded" example on macOS

* Restore video mode upon closing an exclusive fullscreen window

* Fix "multithreaded" example closing multiple windows at once

* Fix compilation on Linux

* Update FEATURES.md

* Don't care about logical monitor groups on X11

* Add exclusive fullscreen for X11

* Update FEATURES.md

* Fix transitions between exclusive and borderless fullscreen on X11

* Update CHANGELOG.md

* Document that Wayland doesn't support exclusive fullscreen

* Replace core-graphics display mode bindings on macOS

* Use `panic!()` instead of `unreachable!()` in "fullscreen" example

* Fix fullscreen "always on top" flag on Windows

* Track current monitor for fullscreen in "multithreaded" example

* Fix exclusive fullscreen sometimes not positioning window properly

* Format

* More formatting and fix CI issues

* Fix formatting

* Fix changelog formatting

CHANGELOG.md

@@ -1,10 +1,16 @@
 # Unreleased
+
 - On macOS, drop the run closure on exit.
 - On Windows, location of `WindowEvent::Touch` are window client coordinates instead of screen coordinates.
 - On X11, fix delayed events after window redraw.
 - On macOS, add `WindowBuilderExt::with_disallow_hidpi` to have the option to turn off best resolution openGL surface.
 - On Windows, screen saver won't start if the window is in fullscreen mode.
 - Change all occurrences of the `new_user_event` method to `with_user_event`.
+- On macOS, the dock and the menu bar are now hidden in fullscreen mode.
+- `Window::set_fullscreen` now takes `Option<Fullscreen>` where `Fullscreen`
+  consists of `Fullscreen::Exclusive(VideoMode)` and
+  `Fullscreen::Borderless(MonitorHandle)` variants.
+    - Adds support for exclusive fullscreen mode.
 
 # 0.20.0 Alpha 2 (2019-07-09)
 

FEATURES.md

@@ -84,6 +84,9 @@ If your PR makes notable changes to Winit's features, please update this section
 - **Fullscreen**: The windows created by winit can be put into fullscreen mode.
 - **Fullscreen toggle**: The windows created by winit can be switched to and from fullscreen after
   creation.
+- **Exclusive fullscreen**: Winit allows changing the video mode of the monitor
+  for fullscreen windows, and if applicable, captures the monitor for exclusive
+  use by this application.
 - **HiDPI support**: Winit assists developers in appropriately scaling HiDPI content.
 - **Popup / modal windows**: Windows can be created relative to the client area of other windows, and parent
   windows can be disabled in favor of popup windows. This feature also guarantees that popup windows
@@ -157,6 +160,7 @@ Legend:
 |Window maximization toggle       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|**N/A**   |
 |Fullscreen                       |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|❌        |
 |Fullscreen toggle                |✔️     |✔️     |✔️         |✔️             |**N/A**|**N/A**|❌        |
+|Exclusive fullscreen             |✔️     |✔️     |✔️         |**N/A**         |❌    |❌     |❌        |
 |HiDPI support                    |✔️     |✔️     |✔️         |✔️             |▢[#721]|✔️    |✔️         |
 |Popup windows                    |❌     |❌     |❌         |❌             |❌    |❌     |❌        |
 

examples/fullscreen.rs

@@ -1,56 +1,35 @@
-use std::io::{self, Write};
+use std::io::{stdin, stdout, Write};
-use winit::{
+use winit::event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent};
-    event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
+use winit::event_loop::{ControlFlow, EventLoop};
-    event_loop::{ControlFlow, EventLoop},
+use winit::monitor::{MonitorHandle, VideoMode};
-    monitor::MonitorHandle,
+use winit::window::{Fullscreen, WindowBuilder};
-    window::WindowBuilder,
-};
 
 fn main() {
     let event_loop = EventLoop::new();
 
-    #[cfg(target_os = "macos")]
+    print!("Please choose the fullscreen mode: (1) exclusive, (2) borderless: ");
-    let mut macos_use_simple_fullscreen = false;
+    stdout().flush().unwrap();
-
-    let monitor = {
-        // On macOS there are two fullscreen modes "native" and "simple"
-        #[cfg(target_os = "macos")]
-        {
-            print!("Please choose the fullscreen mode: (1) native, (2) simple: ");
-            io::stdout().flush().unwrap();
 
     let mut num = String::new();
-            io::stdin().read_line(&mut num).unwrap();
+    stdin().read_line(&mut num).unwrap();
     let num = num.trim().parse().ok().expect("Please enter a number");
-            match num {
-                2 => macos_use_simple_fullscreen = true,
-                _ => {}
-            }
 
-            // Prompt for monitor when using native fullscreen
+    let fullscreen = Some(match num {
-            if !macos_use_simple_fullscreen {
+        1 => Fullscreen::Exclusive(prompt_for_video_mode(&prompt_for_monitor(&event_loop))),
-                Some(prompt_for_monitor(&event_loop))
+        2 => Fullscreen::Borderless(prompt_for_monitor(&event_loop)),
-            } else {
+        _ => panic!("Please enter a valid number"),
-                None
+    });
-            }
-        }
 
-        #[cfg(not(target_os = "macos"))]
-        Some(prompt_for_monitor(&event_loop))
-    };
-
-    let mut is_fullscreen = monitor.is_some();
     let mut is_maximized = false;
     let mut decorations = true;
 
     let window = WindowBuilder::new()
         .with_title("Hello world!")
-        .with_fullscreen(monitor)
+        .with_fullscreen(fullscreen.clone())
         .build(&event_loop)
         .unwrap();
 
     event_loop.run(move |event, _, control_flow| {
-        println!("{:?}", event);
         *control_flow = ControlFlow::Wait;
 
         match event {
@@ -67,35 +46,14 @@ fn main() {
                 } => match (virtual_code, state) {
                     (VirtualKeyCode::Escape, _) => *control_flow = ControlFlow::Exit,
                     (VirtualKeyCode::F, ElementState::Pressed) => {
-                        #[cfg(target_os = "macos")]
+                        if window.fullscreen().is_some() {
-                        {
-                            if macos_use_simple_fullscreen {
-                                use winit::platform::macos::WindowExtMacOS;
-                                if WindowExtMacOS::set_simple_fullscreen(&window, !is_fullscreen) {
-                                    is_fullscreen = !is_fullscreen;
-                                }
-                                return;
-                            }
-                        }
-
-                        is_fullscreen = !is_fullscreen;
-                        if !is_fullscreen {
                             window.set_fullscreen(None);
                         } else {
-                            window.set_fullscreen(Some(window.current_monitor()));
+                            window.set_fullscreen(fullscreen.clone());
                         }
                     }
                     (VirtualKeyCode::S, ElementState::Pressed) => {
                         println!("window.fullscreen {:?}", window.fullscreen());
-
-                        #[cfg(target_os = "macos")]
-                        {
-                            use winit::platform::macos::WindowExtMacOS;
-                            println!(
-                                "window.simple_fullscreen {:?}",
-                                WindowExtMacOS::simple_fullscreen(&window)
-                            );
-                        }
                     }
                     (VirtualKeyCode::M, ElementState::Pressed) => {
                         is_maximized = !is_maximized;
@@ -121,10 +79,10 @@ fn prompt_for_monitor(event_loop: &EventLoop<()>) -> MonitorHandle {
     }
 
     print!("Please write the number of the monitor to use: ");
-    io::stdout().flush().unwrap();
+    stdout().flush().unwrap();
 
     let mut num = String::new();
-    io::stdin().read_line(&mut num).unwrap();
+    stdin().read_line(&mut num).unwrap();
     let num = num.trim().parse().ok().expect("Please enter a number");
     let monitor = event_loop
         .available_monitors()
@@ -135,3 +93,24 @@ fn prompt_for_monitor(event_loop: &EventLoop<()>) -> MonitorHandle {
 
     monitor
 }
+
+fn prompt_for_video_mode(monitor: &MonitorHandle) -> VideoMode {
+    for (i, video_mode) in monitor.video_modes().enumerate() {
+        println!("Video mode #{}: {}", i, video_mode);
+    }
+
+    print!("Please write the number of the video mode to use: ");
+    stdout().flush().unwrap();
+
+    let mut num = String::new();
+    stdin().read_line(&mut num).unwrap();
+    let num = num.trim().parse().ok().expect("Please enter a number");
+    let video_mode = monitor
+        .video_modes()
+        .nth(num)
+        .expect("Please enter a valid ID");
+
+    println!("Using {}", video_mode);
+
+    video_mode
+}

examples/multithreaded.rs

@@ -4,7 +4,7 @@ use std::{collections::HashMap, sync::mpsc, thread, time::Duration};
 use winit::{
     event::{ElementState, Event, KeyboardInput, VirtualKeyCode, WindowEvent},
     event_loop::{ControlFlow, EventLoop},
-    window::{CursorIcon, WindowBuilder},
+    window::{CursorIcon, Fullscreen, WindowBuilder},
 };
 
 const WINDOW_COUNT: usize = 3;
@@ -19,11 +19,34 @@ fn main() {
             .with_inner_size(WINDOW_SIZE.into())
             .build(&event_loop)
             .unwrap();
+
+        let mut video_modes: Vec<_> = window.current_monitor().video_modes().collect();
+        let mut video_mode_id = 0usize;
+
         let (tx, rx) = mpsc::channel();
         window_senders.insert(window.id(), tx);
         thread::spawn(move || {
             while let Ok(event) = rx.recv() {
                 match event {
+                    WindowEvent::Moved { .. } => {
+                        // We need to update our chosen video mode if the window
+                        // was moved to an another monitor, so that the window
+                        // appears on this monitor instead when we go fullscreen
+                        let previous_video_mode = video_modes.iter().cloned().nth(video_mode_id);
+                        video_modes = window.current_monitor().video_modes().collect();
+                        video_mode_id = video_mode_id.min(video_modes.len());
+                        let video_mode = video_modes.iter().nth(video_mode_id);
+
+                        // Different monitors may support different video modes,
+                        // and the index we chose previously may now point to a
+                        // completely different video mode, so notify the user
+                        if video_mode != previous_video_mode.as_ref() {
+                            println!(
+                                "Window moved to another monitor, picked video mode: {}",
+                                video_modes.iter().nth(video_mode_id).unwrap()
+                            );
+                        }
+                    }
                     WindowEvent::KeyboardInput {
                         input:
                             KeyboardInput {
@@ -44,9 +67,26 @@ fn main() {
                                 false => CursorIcon::Default,
                             }),
                             D => window.set_decorations(!state),
-                            F => window.set_fullscreen(match state {
+                            // Cycle through video modes
-                                true => Some(window.current_monitor()),
+                            Right | Left => {
-                                false => None,
+                                video_mode_id = match key {
+                                    Left => video_mode_id.saturating_sub(1),
+                                    Right => (video_modes.len() - 1).min(video_mode_id + 1),
+                                    _ => unreachable!(),
+                                };
+                                println!(
+                                    "Picking video mode: {}",
+                                    video_modes.iter().nth(video_mode_id).unwrap()
+                                );
+                            }
+                            F => window.set_fullscreen(match (state, modifiers.alt) {
+                                (true, false) => {
+                                    Some(Fullscreen::Borderless(window.current_monitor()))
+                                }
+                                (true, true) => Some(Fullscreen::Exclusive(
+                                    video_modes.iter().nth(video_mode_id).unwrap().clone(),
+                                )),
+                                (false, _) => None,
                             }),
                             G => window.set_cursor_grab(state).unwrap(),
                             H => window.set_cursor_visible(!state),
@@ -56,6 +96,7 @@ fn main() {
                                 println!("-> inner_position : {:?}", window.inner_position());
                                 println!("-> outer_size     : {:?}", window.outer_size());
                                 println!("-> inner_size     : {:?}", window.inner_size());
+                                println!("-> fullscreen     : {:?}", window.fullscreen());
                             }
                             L => window.set_min_inner_size(match state {
                                 true => Some(WINDOW_SIZE.into()),
@@ -108,6 +149,7 @@ fn main() {
                 | WindowEvent::KeyboardInput {
                     input:
                         KeyboardInput {
+                            state: ElementState::Released,
                             virtual_keycode: Some(VirtualKeyCode::Escape),
                             ..
                         },

examples/video_modes.rs

@@ -7,6 +7,6 @@ fn main() {
     println!("Listing available video modes:");
 
     for mode in monitor.video_modes() {
-        println!("{:?}", mode);
+        println!("{}", mode);
     }
 }

src/lib.rs

@@ -121,7 +121,6 @@ extern crate log;
 #[macro_use]
 extern crate serde;
 #[macro_use]
-#[cfg(target_os = "windows")]
 extern crate derivative;
 #[macro_use]
 #[cfg(target_os = "windows")]

src/monitor.rs

@@ -52,17 +52,41 @@ impl Iterator for AvailableMonitorsIter {
 /// - [`MonitorHandle::video_modes`][monitor_get].
 ///
 /// [monitor_get]: ../monitor/struct.MonitorHandle.html#method.video_modes
-#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Derivative)]
+#[derivative(Clone, Debug = "transparent", PartialEq, Eq, Hash)]
 pub struct VideoMode {
-    pub(crate) size: (u32, u32),
+    pub(crate) video_mode: platform_impl::VideoMode,
-    pub(crate) bit_depth: u16,
+}
-    pub(crate) refresh_rate: u16,
+
+impl PartialOrd for VideoMode {
+    fn partial_cmp(&self, other: &VideoMode) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for VideoMode {
+    fn cmp(&self, other: &VideoMode) -> std::cmp::Ordering {
+        // TODO: we can impl `Ord` for `PhysicalSize` once we switch from `f32`
+        // to `u32` there
+        let size: (u32, u32) = self.size().into();
+        let other_size: (u32, u32) = other.size().into();
+        self.monitor().cmp(&other.monitor()).then(
+            size.cmp(&other_size)
+                .then(
+                    self.refresh_rate()
+                        .cmp(&other.refresh_rate())
+                        .then(self.bit_depth().cmp(&other.bit_depth())),
+                )
+                .reverse(),
+        )
+    }
 }
 
 impl VideoMode {
     /// Returns the resolution of this video mode.
+    #[inline]
     pub fn size(&self) -> PhysicalSize {
-        self.size.into()
+        self.video_mode.size()
     }
 
     /// Returns the bit depth of this video mode, as in how many bits you have
@@ -73,15 +97,37 @@ impl VideoMode {
     ///
     /// - **Wayland:** Always returns 32.
     /// - **iOS:** Always returns 32.
+    #[inline]
     pub fn bit_depth(&self) -> u16 {
-        self.bit_depth
+        self.video_mode.bit_depth()
     }
 
     /// Returns the refresh rate of this video mode. **Note**: the returned
     /// refresh rate is an integer approximation, and you shouldn't rely on this
     /// value to be exact.
+    #[inline]
     pub fn refresh_rate(&self) -> u16 {
-        self.refresh_rate
+        self.video_mode.refresh_rate()
+    }
+
+    /// Returns the monitor that this video mode is valid for. Each monitor has
+    /// a separate set of valid video modes.
+    #[inline]
+    pub fn monitor(&self) -> MonitorHandle {
+        self.video_mode.monitor()
+    }
+}
+
+impl std::fmt::Display for VideoMode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}x{} @ {} Hz ({} bpp)",
+            self.size().width,
+            self.size().height,
+            self.refresh_rate(),
+            self.bit_depth()
+        )
     }
 }
 
@@ -90,7 +136,7 @@ impl VideoMode {
 /// Allows you to retrieve information about a given monitor and can be used in [`Window`] creation.
 ///
 /// [`Window`]: ../window/struct.Window.html
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub struct MonitorHandle {
     pub(crate) inner: platform_impl::MonitorHandle,
 }

src/platform_impl/ios/mod.rs

@@ -79,7 +79,7 @@ use std::fmt;
 
 pub use self::{
     event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget},
-    monitor::MonitorHandle,
+    monitor::{MonitorHandle, VideoMode},
     window::{PlatformSpecificWindowBuilderAttributes, Window, WindowId},
 };
 

src/platform_impl/ios/monitor.rs

@@ -1,18 +1,44 @@
 use std::{
-    collections::{HashSet, VecDeque},
+    collections::{BTreeSet, VecDeque},
     fmt,
     ops::{Deref, DerefMut},
 };
 
 use crate::{
     dpi::{PhysicalPosition, PhysicalSize},
-    monitor::VideoMode,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
+    platform_impl::platform::ffi::{id, nil, CGFloat, CGRect, CGSize, NSInteger, NSUInteger},
 };
 
-use crate::platform_impl::platform::ffi::{
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
-    id, nil, CGFloat, CGRect, CGSize, NSInteger, NSUInteger,
+pub struct VideoMode {
-};
+    pub(crate) size: (u32, u32),
+    pub(crate) bit_depth: u16,
+    pub(crate) refresh_rate: u16,
+    pub(crate) monitor: MonitorHandle,
+}
 
+impl VideoMode {
+    pub fn size(&self) -> PhysicalSize {
+        self.size.into()
+    }
+
+    pub fn bit_depth(&self) -> u16 {
+        self.bit_depth
+    }
+
+    pub fn refresh_rate(&self) -> u16 {
+        self.refresh_rate
+    }
+
+    pub fn monitor(&self) -> RootMonitorHandle {
+        RootMonitorHandle {
+            inner: self.monitor.clone(),
+        }
+    }
+}
+
+#[derive(PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct Inner {
     uiscreen: id,
 }
@@ -25,6 +51,7 @@ impl Drop for Inner {
     }
 }
 
+#[derive(PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub struct MonitorHandle {
     inner: Inner,
 }
@@ -140,21 +167,24 @@ impl Inner {
         }
     }
 
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+    pub fn video_modes(&self) -> impl Iterator<Item = RootVideoMode> {
         let refresh_rate: NSInteger = unsafe { msg_send![self.uiscreen, maximumFramesPerSecond] };
 
         let available_modes: id = unsafe { msg_send![self.uiscreen, availableModes] };
         let available_mode_count: NSUInteger = unsafe { msg_send![available_modes, count] };
 
-        let mut modes = HashSet::with_capacity(available_mode_count);
+        let mut modes = BTreeSet::new();
 
         for i in 0..available_mode_count {
             let mode: id = unsafe { msg_send![available_modes, objectAtIndex: i] };
             let size: CGSize = unsafe { msg_send![mode, size] };
-            modes.insert(VideoMode {
+            modes.insert(RootVideoMode {
+                video_mode: VideoMode {
                     size: (size.width as u32, size.height as u32),
                     bit_depth: 32,
                     refresh_rate: refresh_rate as u16,
+                    monitor: MonitorHandle::retained_new(self.uiscreen),
+                },
             });
         }
 

src/platform_impl/ios/view.rs

@@ -8,15 +8,14 @@ use objc::{
 use crate::{
     event::{DeviceId as RootDeviceId, Event, Touch, TouchPhase, WindowEvent},
     platform::ios::MonitorHandleExtIOS,
-    window::{WindowAttributes, WindowId as RootWindowId},
+    platform_impl::platform::{
-};
-
-use crate::platform_impl::platform::{
         app_state::AppState,
         event_loop,
         ffi::{id, nil, CGFloat, CGPoint, CGRect, UIInterfaceOrientationMask, UITouchPhase},
         window::PlatformSpecificWindowBuilderAttributes,
         DeviceId,
+    },
+    window::{Fullscreen, WindowAttributes, WindowId as RootWindowId},
 };
 
 // requires main thread
@@ -366,8 +365,12 @@ pub unsafe fn create_window(
     if let Some(hidpi_factor) = platform_attributes.hidpi_factor {
         let () = msg_send![window, setContentScaleFactor: hidpi_factor as CGFloat];
     }
-    if let &Some(ref monitor) = &window_attributes.fullscreen {
+    match window_attributes.fullscreen {
-        let () = msg_send![window, setScreen:monitor.ui_screen()];
+        Some(Fullscreen::Exclusive(_)) => unimplemented!(),
+        Some(Fullscreen::Borderless(ref monitor)) => {
+            msg_send![window, setScreen:monitor.ui_screen()]
+        }
+        None => (),
     }
 
     window

src/platform_impl/ios/window.rs

@@ -17,7 +17,7 @@ use crate::{
         ffi::{id, CGFloat, CGPoint, CGRect, CGSize, UIEdgeInsets, UIInterfaceOrientationMask},
         monitor, view, EventLoopWindowTarget, MonitorHandle,
     },
-    window::{CursorIcon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, WindowAttributes},
 };
 
 pub struct Inner {
@@ -157,10 +157,11 @@ impl Inner {
         warn!("`Window::set_maximized` is ignored on iOS")
     }
 
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
+    pub fn set_fullscreen(&self, monitor: Option<Fullscreen>) {
         unsafe {
             match monitor {
-                Some(monitor) => {
+                Some(Fullscreen::Exclusive(_)) => unimplemented!("exclusive fullscreen on iOS"), // TODO
+                Some(Fullscreen::Borderless(monitor)) => {
                     let uiscreen = monitor.ui_screen() as id;
                     let current: id = msg_send![self.window, screen];
                     let bounds: CGRect = msg_send![uiscreen, bounds];
@@ -176,7 +177,7 @@ impl Inner {
         }
     }
 
-    pub fn fullscreen(&self) -> Option<RootMonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         unsafe {
             let monitor = self.current_monitor();
             let uiscreen = monitor.inner.ui_screen();
@@ -189,7 +190,7 @@ impl Inner {
                 && screen_space_bounds.size.width == screen_bounds.size.width
                 && screen_space_bounds.size.height == screen_bounds.size.height
             {
-                Some(monitor)
+                Some(Fullscreen::Borderless(monitor))
             } else {
                 None
             }
@@ -293,11 +294,12 @@ impl Window {
         // TODO: transparency, visible
 
         unsafe {
-            let screen = window_attributes
+            let screen = match window_attributes.fullscreen {
-                .fullscreen
+                Some(Fullscreen::Exclusive(_)) => unimplemented!("exclusive fullscreen on iOS"), // TODO: do we set the frame to video mode bounds instead of screen bounds?
-                .as_ref()
+                Some(Fullscreen::Borderless(ref monitor)) => monitor.ui_screen() as id,
-                .map(|screen| screen.ui_screen() as _)
+                None => monitor::main_uiscreen().ui_screen(),
-                .unwrap_or_else(|| monitor::main_uiscreen().ui_screen());
+            };
+
             let screen_bounds: CGRect = msg_send![screen, bounds];
 
             let frame = match window_attributes.inner_size {

src/platform_impl/linux/mod.rs

@@ -13,8 +13,8 @@ use crate::{
     event::Event,
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
     icon::Icon,
-    monitor::{MonitorHandle as RootMonitorHandle, VideoMode},
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
-    window::{CursorIcon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, WindowAttributes},
 };
 
 mod dlopen;
@@ -92,7 +92,7 @@ impl DeviceId {
     }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
 pub enum MonitorHandle {
     X(x11::MonitorHandle),
     Wayland(wayland::MonitorHandle),
@@ -140,7 +140,7 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn video_modes(&self) -> Box<dyn Iterator<Item = VideoMode>> {
+    pub fn video_modes(&self) -> Box<dyn Iterator<Item = RootVideoMode>> {
         match self {
             MonitorHandle::X(m) => Box::new(m.video_modes()),
             MonitorHandle::Wayland(m) => Box::new(m.video_modes()),
@@ -148,6 +148,46 @@ impl MonitorHandle {
     }
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum VideoMode {
+    X(x11::VideoMode),
+    Wayland(wayland::VideoMode),
+}
+
+impl VideoMode {
+    #[inline]
+    pub fn size(&self) -> PhysicalSize {
+        match self {
+            &VideoMode::X(ref m) => m.size(),
+            &VideoMode::Wayland(ref m) => m.size(),
+        }
+    }
+
+    #[inline]
+    pub fn bit_depth(&self) -> u16 {
+        match self {
+            &VideoMode::X(ref m) => m.bit_depth(),
+            &VideoMode::Wayland(ref m) => m.bit_depth(),
+        }
+    }
+
+    #[inline]
+    pub fn refresh_rate(&self) -> u16 {
+        match self {
+            &VideoMode::X(ref m) => m.refresh_rate(),
+            &VideoMode::Wayland(ref m) => m.refresh_rate(),
+        }
+    }
+
+    #[inline]
+    pub fn monitor(&self) -> RootMonitorHandle {
+        match self {
+            &VideoMode::X(ref m) => m.monitor(),
+            &VideoMode::Wayland(ref m) => m.monitor(),
+        }
+    }
+}
+
 impl Window {
     #[inline]
     pub fn new<T>(
@@ -310,17 +350,15 @@ impl Window {
     }
 
     #[inline]
-    pub fn fullscreen(&self) -> Option<RootMonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         match self {
             &Window::X(ref w) => w.fullscreen(),
-            &Window::Wayland(ref w) => w.fullscreen().map(|monitor_id| RootMonitorHandle {
+            &Window::Wayland(ref w) => w.fullscreen(),
-                inner: MonitorHandle::Wayland(monitor_id),
-            }),
         }
     }
 
     #[inline]
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
+    pub fn set_fullscreen(&self, monitor: Option<Fullscreen>) {
         match self {
             &Window::X(ref w) => w.set_fullscreen(monitor),
             &Window::Wayland(ref w) => w.set_fullscreen(monitor),

src/platform_impl/linux/wayland/event_loop.rs

@@ -16,8 +16,11 @@ use crate::{
     dpi::{PhysicalPosition, PhysicalSize},
     event::ModifiersState,
     event_loop::{ControlFlow, EventLoopClosed, EventLoopWindowTarget as RootELW},
-    monitor::VideoMode,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
-    platform_impl::platform::sticky_exit_callback,
+    platform_impl::platform::{
+        sticky_exit_callback, MonitorHandle as PlatformMonitorHandle,
+        VideoMode as PlatformVideoMode,
+    },
 };
 
 use super::{window::WindowStore, DeviceId, WindowId};
@@ -603,17 +606,67 @@ impl<T> Drop for SeatData<T> {
  * Monitor stuff
  */
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct VideoMode {
+    pub(crate) size: (u32, u32),
+    pub(crate) bit_depth: u16,
+    pub(crate) refresh_rate: u16,
+    pub(crate) monitor: MonitorHandle,
+}
+
+impl VideoMode {
+    #[inline]
+    pub fn size(&self) -> PhysicalSize {
+        self.size.into()
+    }
+
+    #[inline]
+    pub fn bit_depth(&self) -> u16 {
+        self.bit_depth
+    }
+
+    #[inline]
+    pub fn refresh_rate(&self) -> u16 {
+        self.refresh_rate
+    }
+
+    #[inline]
+    pub fn monitor(&self) -> RootMonitorHandle {
+        RootMonitorHandle {
+            inner: PlatformMonitorHandle::Wayland(self.monitor.clone()),
+        }
+    }
+}
+
+#[derive(Clone)]
 pub struct MonitorHandle {
     pub(crate) proxy: wl_output::WlOutput,
     pub(crate) mgr: OutputMgr,
 }
 
-impl Clone for MonitorHandle {
+impl PartialEq for MonitorHandle {
-    fn clone(&self) -> MonitorHandle {
+    fn eq(&self, other: &Self) -> bool {
-        MonitorHandle {
+        self.native_identifier() == other.native_identifier()
-            proxy: self.proxy.clone(),
-            mgr: self.mgr.clone(),
     }
+}
+
+impl Eq for MonitorHandle {}
+
+impl PartialOrd for MonitorHandle {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(&other))
+    }
+}
+
+impl Ord for MonitorHandle {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.native_identifier().cmp(&other.native_identifier())
+    }
+}
+
+impl std::hash::Hash for MonitorHandle {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.native_identifier().hash(state);
     }
 }
 
@@ -680,15 +733,20 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+    pub fn video_modes(&self) -> impl Iterator<Item = RootVideoMode> {
+        let monitor = self.clone();
+
         self.mgr
             .with_info(&self.proxy, |_, info| info.modes.clone())
             .unwrap_or(vec![])
             .into_iter()
-            .map(|x| VideoMode {
+            .map(move |x| RootVideoMode {
+                video_mode: PlatformVideoMode::Wayland(VideoMode {
                     size: (x.dimensions.0 as u32, x.dimensions.1 as u32),
                     refresh_rate: (x.refresh_rate as f32 / 1000.0).round() as u16,
                     bit_depth: 32,
+                    monitor: monitor.clone(),
+                }),
             })
     }
 }

src/platform_impl/linux/wayland/mod.rs

@@ -3,7 +3,8 @@
 
 pub use self::{
     event_loop::{
-        EventLoop, EventLoopProxy, EventLoopWindowTarget, MonitorHandle, WindowEventsSink,
+        EventLoop, EventLoopProxy, EventLoopWindowTarget, MonitorHandle, VideoMode,
+        WindowEventsSink,
     },
     window::Window,
 };

src/platform_impl/linux/wayland/window.rs

@@ -8,10 +8,11 @@ use crate::{
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
     monitor::MonitorHandle as RootMonitorHandle,
     platform_impl::{
+        platform::wayland::event_loop::{available_monitors, primary_monitor},
         MonitorHandle as PlatformMonitorHandle,
         PlatformSpecificWindowBuilderAttributes as PlAttributes,
     },
-    window::{CursorIcon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, WindowAttributes},
 };
 
 use smithay_client_toolkit::{
@@ -25,7 +26,6 @@ use smithay_client_toolkit::{
 };
 
 use super::{make_wid, EventLoopWindowTarget, MonitorHandle, WindowId};
-use crate::platform_impl::platform::wayland::event_loop::{available_monitors, primary_monitor};
 
 pub struct Window {
     surface: wl_surface::WlSurface,
@@ -108,14 +108,20 @@ impl Window {
         }
 
         // Check for fullscreen requirements
-        if let Some(RootMonitorHandle {
+        match attributes.fullscreen {
+            Some(Fullscreen::Exclusive(_)) => {
+                panic!("Wayland doesn't support exclusive fullscreen")
+            }
+            Some(Fullscreen::Borderless(RootMonitorHandle {
                 inner: PlatformMonitorHandle::Wayland(ref monitor_id),
-        }) = attributes.fullscreen
+            })) => frame.set_fullscreen(Some(&monitor_id.proxy)),
-        {
+            Some(Fullscreen::Borderless(_)) => unreachable!(),
-            frame.set_fullscreen(Some(&monitor_id.proxy));
+            None => {
-        } else if attributes.maximized {
+                if attributes.maximized {
                     frame.set_maximized();
                 }
+            }
+        }
 
         frame.set_resizable(attributes.resizable);
 
@@ -252,25 +258,31 @@ impl Window {
         }
     }
 
-    pub fn fullscreen(&self) -> Option<MonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         if *(self.fullscreen.lock().unwrap()) {
-            Some(self.current_monitor())
+            Some(Fullscreen::Borderless(RootMonitorHandle {
+                inner: PlatformMonitorHandle::Wayland(self.current_monitor()),
+            }))
         } else {
             None
         }
     }
 
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
+    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
-        if let Some(RootMonitorHandle {
+        match fullscreen {
+            Some(Fullscreen::Exclusive(_)) => {
+                panic!("Wayland doesn't support exclusive fullscreen")
+            }
+            Some(Fullscreen::Borderless(RootMonitorHandle {
                 inner: PlatformMonitorHandle::Wayland(ref monitor_id),
-        }) = monitor
+            })) => {
-        {
                 self.frame
                     .lock()
                     .unwrap()
                     .set_fullscreen(Some(&monitor_id.proxy));
-        } else {
+            }
-            self.frame.lock().unwrap().unset_fullscreen();
+            Some(Fullscreen::Borderless(_)) => unreachable!(),
+            None => self.frame.lock().unwrap().unset_fullscreen(),
         }
     }
 

src/platform_impl/linux/x11/mod.rs

@@ -11,7 +11,7 @@ mod window;
 mod xdisplay;
 
 pub use self::{
-    monitor::MonitorHandle,
+    monitor::{MonitorHandle, VideoMode},
     window::UnownedWindow,
     xdisplay::{XConnection, XError, XNotSupported},
 };

src/platform_impl/linux/x11/monitor.rs

@@ -4,47 +4,66 @@ use parking_lot::Mutex;
 
 use super::{
     ffi::{
-        RRCrtcChangeNotifyMask, RROutputPropertyNotifyMask, RRScreenChangeNotifyMask, True, Window,
+        RRCrtc, RRCrtcChangeNotifyMask, RRMode, RROutputPropertyNotifyMask,
-        XRRScreenResources,
+        RRScreenChangeNotifyMask, True, Window, XRRCrtcInfo, XRRScreenResources,
     },
     util, XConnection, XError,
 };
 use crate::{
     dpi::{PhysicalPosition, PhysicalSize},
-    monitor::VideoMode,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
+    platform_impl::{MonitorHandle as PlatformMonitorHandle, VideoMode as PlatformVideoMode},
 };
 
-// Used to test XRandR < 1.5 code path. This should always be committed as false.
+// Used for testing. This should always be committed as false.
-const FORCE_RANDR_COMPAT: bool = false;
-// Also used for testing. This should always be committed as false.
 const DISABLE_MONITOR_LIST_CACHING: bool = false;
 
 lazy_static! {
-    static ref XRANDR_VERSION: Mutex<Option<(c_int, c_int)>> = Mutex::default();
     static ref MONITORS: Mutex<Option<Vec<MonitorHandle>>> = Mutex::default();
 }
 
-fn version_is_at_least(major: c_int, minor: c_int) -> bool {
-    if let Some((avail_major, avail_minor)) = *XRANDR_VERSION.lock() {
-        if avail_major == major {
-            avail_minor >= minor
-        } else {
-            avail_major > major
-        }
-    } else {
-        unreachable!();
-    }
-}
-
 pub fn invalidate_cached_monitor_list() -> Option<Vec<MonitorHandle>> {
     // We update this lazily.
     (*MONITORS.lock()).take()
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct VideoMode {
+    pub(crate) size: (u32, u32),
+    pub(crate) bit_depth: u16,
+    pub(crate) refresh_rate: u16,
+    pub(crate) native_mode: RRMode,
+    pub(crate) monitor: Option<MonitorHandle>,
+}
+
+impl VideoMode {
+    #[inline]
+    pub fn size(&self) -> PhysicalSize {
+        self.size.into()
+    }
+
+    #[inline]
+    pub fn bit_depth(&self) -> u16 {
+        self.bit_depth
+    }
+
+    #[inline]
+    pub fn refresh_rate(&self) -> u16 {
+        self.refresh_rate
+    }
+
+    #[inline]
+    pub fn monitor(&self) -> RootMonitorHandle {
+        RootMonitorHandle {
+            inner: PlatformMonitorHandle::X(self.monitor.clone().unwrap()),
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct MonitorHandle {
     /// The actual id
-    id: u32,
+    pub(crate) id: RRCrtc,
     /// The name of the monitor
     pub(crate) name: String,
     /// The size of the monitor
@@ -61,16 +80,43 @@ pub struct MonitorHandle {
     video_modes: Vec<VideoMode>,
 }
 
+impl PartialEq for MonitorHandle {
+    fn eq(&self, other: &Self) -> bool {
+        self.id == other.id
+    }
+}
+
+impl Eq for MonitorHandle {}
+
+impl PartialOrd for MonitorHandle {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(&other))
+    }
+}
+
+impl Ord for MonitorHandle {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.id.cmp(&other.id)
+    }
+}
+
+impl std::hash::Hash for MonitorHandle {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.id.hash(state);
+    }
+}
+
 impl MonitorHandle {
-    fn from_repr(
+    fn new(
         xconn: &XConnection,
         resources: *mut XRRScreenResources,
-        id: u32,
+        id: RRCrtc,
-        repr: util::MonitorRepr,
+        crtc: *mut XRRCrtcInfo,
         primary: bool,
     ) -> Option<Self> {
-        let (name, hidpi_factor, video_modes) = unsafe { xconn.get_output_info(resources, &repr)? };
+        let (name, hidpi_factor, video_modes) = unsafe { xconn.get_output_info(resources, crtc)? };
-        let (dimensions, position) = unsafe { (repr.size(), repr.position()) };
+        let dimensions = unsafe { ((*crtc).width as u32, (*crtc).height as u32) };
+        let position = unsafe { ((*crtc).x as i32, (*crtc).y as i32) };
         let rect = util::AaRect::new(position, dimensions);
         Some(MonitorHandle {
             id,
@@ -107,8 +153,14 @@ impl MonitorHandle {
     }
 
     #[inline]
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+    pub fn video_modes(&self) -> impl Iterator<Item = RootVideoMode> {
-        self.video_modes.clone().into_iter()
+        let monitor = self.clone();
+        self.video_modes.clone().into_iter().map(move |mut x| {
+            x.monitor = Some(monitor.clone());
+            RootVideoMode {
+                video_mode: PlatformVideoMode::X(x),
+            }
+        })
     }
 }
 
@@ -139,8 +191,12 @@ impl XConnection {
 
     fn query_monitor_list(&self) -> Vec<MonitorHandle> {
         unsafe {
+            let mut major = 0;
+            let mut minor = 0;
+            (self.xrandr.XRRQueryVersion)(self.display, &mut major, &mut minor);
+
             let root = (self.xlib.XDefaultRootWindow)(self.display);
-            let resources = if version_is_at_least(1, 3) {
+            let resources = if (major == 1 && minor >= 3) || major > 1 {
                 (self.xrandr.XRRGetScreenResourcesCurrent)(self.display, root)
             } else {
                 // WARNING: this function is supposedly very slow, on the order of hundreds of ms.
@@ -155,33 +211,6 @@ impl XConnection {
             let mut available;
             let mut has_primary = false;
 
-            if self.xrandr_1_5.is_some() && version_is_at_least(1, 5) && !FORCE_RANDR_COMPAT {
-                // We're in XRandR >= 1.5, enumerate monitors. This supports things like MST and
-                // videowalls.
-                let xrandr_1_5 = self.xrandr_1_5.as_ref().unwrap();
-                let mut monitor_count = 0;
-                let monitors =
-                    (xrandr_1_5.XRRGetMonitors)(self.display, root, 1, &mut monitor_count);
-                assert!(monitor_count >= 0);
-                available = Vec::with_capacity(monitor_count as usize);
-                for monitor_index in 0..monitor_count {
-                    let monitor = monitors.offset(monitor_index as isize);
-                    let is_primary = (*monitor).primary != 0;
-                    has_primary |= is_primary;
-                    MonitorHandle::from_repr(
-                        self,
-                        resources,
-                        monitor_index as u32,
-                        monitor.into(),
-                        is_primary,
-                    )
-                    .map(|monitor_id| available.push(monitor_id));
-                }
-                (xrandr_1_5.XRRFreeMonitors)(monitors);
-            } else {
-                // We're in XRandR < 1.5, enumerate CRTCs. Everything will work except MST and
-                // videowall setups will also show monitors that aren't in the logical groups the user
-                // cares about.
             let primary = (self.xrandr.XRRGetOutputPrimary)(self.display, root);
             available = Vec::with_capacity((*resources).ncrtc as usize);
             for crtc_index in 0..(*resources).ncrtc {
@@ -189,15 +218,13 @@ impl XConnection {
                 let crtc = (self.xrandr.XRRGetCrtcInfo)(self.display, resources, crtc_id);
                 let is_active = (*crtc).width > 0 && (*crtc).height > 0 && (*crtc).noutput > 0;
                 if is_active {
-                        let crtc = util::MonitorRepr::from(crtc);
+                    let is_primary = *(*crtc).outputs.offset(0) == primary;
-                        let is_primary = crtc.get_output() == primary;
                     has_primary |= is_primary;
-                        MonitorHandle::from_repr(self, resources, crtc_id as u32, crtc, is_primary)
+                    MonitorHandle::new(self, resources, crtc_id, crtc, is_primary)
                         .map(|monitor_id| available.push(monitor_id));
                 }
                 (self.xrandr.XRRFreeCrtcInfo)(crtc);
             }
-            }
 
             // If no monitors were detected as being primary, we just pick one ourselves!
             if !has_primary {
@@ -236,19 +263,15 @@ impl XConnection {
     }
 
     pub fn select_xrandr_input(&self, root: Window) -> Result<c_int, XError> {
-        {
+        let has_xrandr = unsafe {
-            let mut version_lock = XRANDR_VERSION.lock();
-            if version_lock.is_none() {
             let mut major = 0;
             let mut minor = 0;
-                let has_extension =
+            (self.xrandr.XRRQueryVersion)(self.display, &mut major, &mut minor)
-                    unsafe { (self.xrandr.XRRQueryVersion)(self.display, &mut major, &mut minor) };
+        };
-                if has_extension != True {
+        assert!(
-                    panic!("[winit] XRandR extension not available.");
+            has_xrandr == True,
-                }
+            "[winit] XRandR extension not available."
-                *version_lock = Some((major, minor));
+        );
-            }
-        }
 
         let mut event_offset = 0;
         let mut error_offset = 0;

src/platform_impl/linux/x11/util/randr.rs

@@ -1,7 +1,10 @@
 use std::{env, slice, str::FromStr};
 
-use super::*;
+use super::{
-use crate::{dpi::validate_hidpi_factor, monitor::VideoMode};
+    ffi::{CurrentTime, RRCrtc, RRMode, Success, XRRCrtcInfo, XRRScreenResources},
+    *,
+};
+use crate::{dpi::validate_hidpi_factor, platform_impl::platform::x11::VideoMode};
 
 pub fn calc_dpi_factor(
     (width_px, height_px): (u32, u32),
@@ -34,47 +37,6 @@ pub fn calc_dpi_factor(
     dpi_factor
 }
 
-pub enum MonitorRepr {
-    Monitor(*mut ffi::XRRMonitorInfo),
-    Crtc(*mut ffi::XRRCrtcInfo),
-}
-
-impl MonitorRepr {
-    pub unsafe fn get_output(&self) -> ffi::RROutput {
-        match *self {
-            // Same member names, but different locations within the struct...
-            MonitorRepr::Monitor(monitor) => *((*monitor).outputs.offset(0)),
-            MonitorRepr::Crtc(crtc) => *((*crtc).outputs.offset(0)),
-        }
-    }
-
-    pub unsafe fn size(&self) -> (u32, u32) {
-        match *self {
-            MonitorRepr::Monitor(monitor) => ((*monitor).width as u32, (*monitor).height as u32),
-            MonitorRepr::Crtc(crtc) => ((*crtc).width as u32, (*crtc).height as u32),
-        }
-    }
-
-    pub unsafe fn position(&self) -> (i32, i32) {
-        match *self {
-            MonitorRepr::Monitor(monitor) => ((*monitor).x as i32, (*monitor).y as i32),
-            MonitorRepr::Crtc(crtc) => ((*crtc).x as i32, (*crtc).y as i32),
-        }
-    }
-}
-
-impl From<*mut ffi::XRRMonitorInfo> for MonitorRepr {
-    fn from(monitor: *mut ffi::XRRMonitorInfo) -> Self {
-        MonitorRepr::Monitor(monitor)
-    }
-}
-
-impl From<*mut ffi::XRRCrtcInfo> for MonitorRepr {
-    fn from(crtc: *mut ffi::XRRCrtcInfo) -> Self {
-        MonitorRepr::Crtc(crtc)
-    }
-}
-
 impl XConnection {
     // Retrieve DPI from Xft.dpi property
     pub unsafe fn get_xft_dpi(&self) -> Option<f64> {
@@ -96,11 +58,11 @@ impl XConnection {
     }
     pub unsafe fn get_output_info(
         &self,
-        resources: *mut ffi::XRRScreenResources,
+        resources: *mut XRRScreenResources,
-        repr: &MonitorRepr,
+        crtc: *mut XRRCrtcInfo,
     ) -> Option<(String, f64, Vec<VideoMode>)> {
         let output_info =
-            (self.xrandr.XRRGetOutputInfo)(self.display, resources, repr.get_output());
+            (self.xrandr.XRRGetOutputInfo)(self.display, resources, *(*crtc).outputs.offset(0));
         if output_info.is_null() {
             // When calling `XRRGetOutputInfo` on a virtual monitor (versus a physical display)
             // it's possible for it to return null.
@@ -132,6 +94,10 @@ impl XConnection {
                     size: (x.width, x.height),
                     refresh_rate: (refresh_rate as f32 / 1000.0).round() as u16,
                     bit_depth: bit_depth as u16,
+                    native_mode: x.id,
+                    // This is populated in `MonitorHandle::video_modes` as the
+                    // video mode is returned to the user
+                    monitor: None,
                 }
             });
 
@@ -144,7 +110,7 @@ impl XConnection {
             dpi / 96.
         } else {
             calc_dpi_factor(
-                repr.size(),
+                ((*crtc).width as u32, (*crtc).height as u32),
                 (
                     (*output_info).mm_width as u64,
                     (*output_info).mm_height as u64,
@@ -155,4 +121,61 @@ impl XConnection {
         (self.xrandr.XRRFreeOutputInfo)(output_info);
         Some((name, hidpi_factor, modes.collect()))
     }
+    pub fn set_crtc_config(&self, crtc_id: RRCrtc, mode_id: RRMode) -> Result<(), ()> {
+        unsafe {
+            let mut major = 0;
+            let mut minor = 0;
+            (self.xrandr.XRRQueryVersion)(self.display, &mut major, &mut minor);
+
+            let root = (self.xlib.XDefaultRootWindow)(self.display);
+            let resources = if (major == 1 && minor >= 3) || major > 1 {
+                (self.xrandr.XRRGetScreenResourcesCurrent)(self.display, root)
+            } else {
+                (self.xrandr.XRRGetScreenResources)(self.display, root)
+            };
+
+            let crtc = (self.xrandr.XRRGetCrtcInfo)(self.display, resources, crtc_id);
+            let status = (self.xrandr.XRRSetCrtcConfig)(
+                self.display,
+                resources,
+                crtc_id,
+                CurrentTime,
+                (*crtc).x,
+                (*crtc).y,
+                mode_id,
+                (*crtc).rotation,
+                (*crtc).outputs.offset(0),
+                1,
+            );
+
+            (self.xrandr.XRRFreeCrtcInfo)(crtc);
+            (self.xrandr.XRRFreeScreenResources)(resources);
+
+            if status == Success as i32 {
+                Ok(())
+            } else {
+                Err(())
+            }
+        }
+    }
+    pub fn get_crtc_mode(&self, crtc_id: RRCrtc) -> RRMode {
+        unsafe {
+            let mut major = 0;
+            let mut minor = 0;
+            (self.xrandr.XRRQueryVersion)(self.display, &mut major, &mut minor);
+
+            let root = (self.xlib.XDefaultRootWindow)(self.display);
+            let resources = if (major == 1 && minor >= 3) || major > 1 {
+                (self.xrandr.XRRGetScreenResourcesCurrent)(self.display, root)
+            } else {
+                (self.xrandr.XRRGetScreenResources)(self.display, root)
+            };
+
+            let crtc = (self.xrandr.XRRGetCrtcInfo)(self.display, resources, crtc_id);
+            let mode = (*crtc).mode;
+            (self.xrandr.XRRFreeCrtcInfo)(crtc);
+            (self.xrandr.XRRFreeScreenResources)(resources);
+            mode
+        }
+    }
 }

src/platform_impl/linux/x11/window.rs

@@ -16,12 +16,13 @@ use parking_lot::Mutex;
 use crate::{
     dpi::{LogicalPosition, LogicalSize},
     error::{ExternalError, NotSupportedError, OsError as RootOsError},
-    monitor::MonitorHandle as RootMonitorHandle,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
     platform_impl::{
         x11::{ime::ImeContextCreationError, MonitorHandle as X11MonitorHandle},
         MonitorHandle as PlatformMonitorHandle, OsError, PlatformSpecificWindowBuilderAttributes,
+        VideoMode as PlatformVideoMode,
     },
-    window::{CursorIcon, Icon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, Icon, WindowAttributes},
 };
 
 use super::{ffi, util, EventLoopWindowTarget, ImeSender, WindowId, XConnection, XError};
@@ -46,9 +47,11 @@ pub struct SharedState {
     pub guessed_dpi: Option<f64>,
     pub last_monitor: Option<X11MonitorHandle>,
     pub dpi_adjusted: Option<(f64, f64)>,
-    pub fullscreen: Option<RootMonitorHandle>,
+    pub fullscreen: Option<Fullscreen>,
-    // Used to restore position after exiting fullscreen.
+    // Used to restore position after exiting fullscreen
     pub restore_position: Option<(i32, i32)>,
+    // Used to restore video mode after exiting fullscreen
+    pub desktop_video_mode: Option<(ffi::RRCrtc, ffi::RRMode)>,
     pub frame_extents: Option<util::FrameExtentsHeuristic>,
     pub min_inner_size: Option<LogicalSize>,
     pub max_inner_size: Option<LogicalSize>,
@@ -408,6 +411,7 @@ impl UnownedWindow {
             if window_attrs.fullscreen.is_some() {
                 window
                     .set_fullscreen_inner(window_attrs.fullscreen.clone())
+                    .unwrap()
                     .queue();
             }
             if window_attrs.always_on_top {
@@ -564,42 +568,123 @@ impl UnownedWindow {
         self.set_netwm(fullscreen.into(), (fullscreen_atom as c_long, 0, 0, 0))
     }
 
-    fn set_fullscreen_inner(&self, monitor: Option<RootMonitorHandle>) -> util::Flusher<'_> {
+    fn set_fullscreen_inner(&self, fullscreen: Option<Fullscreen>) -> Option<util::Flusher<'_>> {
-        match monitor {
+        let mut shared_state_lock = self.shared_state.lock();
+        let old_fullscreen = shared_state_lock.fullscreen.clone();
+        if old_fullscreen == fullscreen {
+            return None;
+        }
+        shared_state_lock.fullscreen = fullscreen.clone();
+
+        match (&old_fullscreen, &fullscreen) {
+            // Store the desktop video mode before entering exclusive
+            // fullscreen, so we can restore it upon exit, as XRandR does not
+            // provide a mechanism to set this per app-session or restore this
+            // to the desktop video mode as macOS and Windows do
+            (
+                &None,
+                &Some(Fullscreen::Exclusive(RootVideoMode {
+                    video_mode: PlatformVideoMode::X(ref video_mode),
+                })),
+            )
+            | (
+                &Some(Fullscreen::Borderless(_)),
+                &Some(Fullscreen::Exclusive(RootVideoMode {
+                    video_mode: PlatformVideoMode::X(ref video_mode),
+                })),
+            ) => {
+                let monitor = video_mode.monitor.as_ref().unwrap();
+                shared_state_lock.desktop_video_mode =
+                    Some((monitor.id, self.xconn.get_crtc_mode(monitor.id)));
+            }
+            // Restore desktop video mode upon exiting exclusive fullscreen
+            (&Some(Fullscreen::Exclusive(_)), &None)
+            | (&Some(Fullscreen::Exclusive(_)), &Some(Fullscreen::Borderless(_))) => {
+                let (monitor_id, mode_id) = shared_state_lock.desktop_video_mode.take().unwrap();
+                self.xconn
+                    .set_crtc_config(monitor_id, mode_id)
+                    .expect("failed to restore desktop video mode");
+            }
+            _ => (),
+        }
+
+        drop(shared_state_lock);
+
+        match fullscreen {
             None => {
                 let flusher = self.set_fullscreen_hint(false);
-                if let Some(position) = self.shared_state.lock().restore_position.take() {
+                let mut shared_state_lock = self.shared_state.lock();
+                if let Some(position) = shared_state_lock.restore_position.take() {
                     self.set_position_inner(position.0, position.1).queue();
                 }
-                flusher
+                Some(flusher)
             }
-            Some(RootMonitorHandle {
+            Some(fullscreen) => {
-                inner: PlatformMonitorHandle::X(monitor),
+                let (video_mode, monitor) = match fullscreen {
-            }) => {
+                    Fullscreen::Exclusive(RootVideoMode {
+                        video_mode: PlatformVideoMode::X(ref video_mode),
+                    }) => (Some(video_mode), video_mode.monitor.as_ref().unwrap()),
+                    Fullscreen::Borderless(RootMonitorHandle {
+                        inner: PlatformMonitorHandle::X(ref monitor),
+                    }) => (None, monitor),
+                    _ => unreachable!(),
+                };
+
+                if let Some(video_mode) = video_mode {
+                    // FIXME: this is actually not correct if we're setting the
+                    // video mode to a resolution higher than the current
+                    // desktop resolution, because XRandR does not automatically
+                    // reposition the monitors to the right and below this
+                    // monitor.
+                    //
+                    // What ends up happening is we will get the fullscreen
+                    // window showing up on those monitors as well, because
+                    // their virtual position now overlaps with the monitor that
+                    // we just made larger..
+                    //
+                    // It'd be quite a bit of work to handle this correctly (and
+                    // nobody else seems to bother doing this correctly either),
+                    // so we're just leaving this broken. Fixing this would
+                    // involve storing all CRTCs upon entering fullscreen,
+                    // restoring them upon exit, and after entering fullscreen,
+                    // repositioning displays to the right and below this
+                    // display. I think there would still be edge cases that are
+                    // difficult or impossible to handle correctly, e.g. what if
+                    // a new monitor was plugged in while in fullscreen?
+                    //
+                    // I think we might just want to disallow setting the video
+                    // mode higher than the current desktop video mode (I'm sure
+                    // this will make someone unhappy, but it's very unusual for
+                    // games to want to do this anyway).
+                    self.xconn
+                        .set_crtc_config(monitor.id, video_mode.native_mode)
+                        .expect("failed to set video mode");
+                }
+
                 let window_position = self.outer_position_physical();
                 self.shared_state.lock().restore_position = Some(window_position);
                 let monitor_origin: (i32, i32) = monitor.position().into();
                 self.set_position_inner(monitor_origin.0, monitor_origin.1)
                     .queue();
-                self.set_fullscreen_hint(true)
+                Some(self.set_fullscreen_hint(true))
             }
-            _ => unreachable!(),
         }
     }
 
     #[inline]
-    pub fn fullscreen(&self) -> Option<RootMonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         self.shared_state.lock().fullscreen.clone()
     }
 
     #[inline]
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
+    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
-        self.shared_state.lock().fullscreen = monitor.clone();
+        if let Some(flusher) = self.set_fullscreen_inner(fullscreen) {
-        self.set_fullscreen_inner(monitor)
+            flusher
                 .flush()
                 .expect("Failed to change window fullscreen state");
             self.invalidate_cached_frame_extents();
         }
+    }
 
     fn get_rect(&self) -> util::AaRect {
         // TODO: This might round-trip more times than needed.

src/platform_impl/macos/ffi.rs

@@ -6,6 +6,13 @@ use cocoa::{
     base::id,
     foundation::{NSInteger, NSUInteger},
 };
+use core_foundation::{
+    array::CFArrayRef, dictionary::CFDictionaryRef, string::CFStringRef, uuid::CFUUIDRef,
+};
+use core_graphics::{
+    base::CGError,
+    display::{CGDirectDisplayID, CGDisplayConfigRef},
+};
 use objc;
 
 pub const NSNotFound: NSInteger = NSInteger::max_value();
@@ -108,3 +115,95 @@ pub enum NSWindowLevel {
     NSPopUpMenuWindowLevel = kCGPopUpMenuWindowLevelKey as _,
     NSScreenSaverWindowLevel = kCGScreenSaverWindowLevelKey as _,
 }
+
+pub type CGDisplayFadeInterval = f32;
+pub type CGDisplayReservationInterval = f32;
+pub type CGDisplayBlendFraction = f32;
+
+pub const kCGDisplayBlendNormal: f32 = 0.0;
+pub const kCGDisplayBlendSolidColor: f32 = 1.0;
+
+pub type CGDisplayFadeReservationToken = u32;
+pub const kCGDisplayFadeReservationInvalidToken: CGDisplayFadeReservationToken = 0;
+
+pub type Boolean = u8;
+pub const FALSE: Boolean = 0;
+pub const TRUE: Boolean = 1;
+
+pub const kCGErrorSuccess: i32 = 0;
+pub const kCGErrorFailure: i32 = 1000;
+pub const kCGErrorIllegalArgument: i32 = 1001;
+pub const kCGErrorInvalidConnection: i32 = 1002;
+pub const kCGErrorInvalidContext: i32 = 1003;
+pub const kCGErrorCannotComplete: i32 = 1004;
+pub const kCGErrorNotImplemented: i32 = 1006;
+pub const kCGErrorRangeCheck: i32 = 1007;
+pub const kCGErrorTypeCheck: i32 = 1008;
+pub const kCGErrorInvalidOperation: i32 = 1010;
+pub const kCGErrorNoneAvailable: i32 = 1011;
+
+pub const IO1BitIndexedPixels: &str = "P";
+pub const IO2BitIndexedPixels: &str = "PP";
+pub const IO4BitIndexedPixels: &str = "PPPP";
+pub const IO8BitIndexedPixels: &str = "PPPPPPPP";
+pub const IO16BitDirectPixels: &str = "-RRRRRGGGGGBBBBB";
+pub const IO32BitDirectPixels: &str = "--------RRRRRRRRGGGGGGGGBBBBBBBB";
+
+pub const kIO30BitDirectPixels: &str = "--RRRRRRRRRRGGGGGGGGGGBBBBBBBBBB";
+pub const kIO64BitDirectPixels: &str = "-16R16G16B16";
+
+pub const kIO16BitFloatPixels: &str = "-16FR16FG16FB16";
+pub const kIO32BitFloatPixels: &str = "-32FR32FG32FB32";
+
+pub const IOYUV422Pixels: &str = "Y4U2V2";
+pub const IO8BitOverlayPixels: &str = "O8";
+
+pub type CGWindowLevel = i32;
+pub type CGDisplayModeRef = *mut libc::c_void;
+
+#[link(name = "CoreGraphics", kind = "framework")]
+extern "C" {
+    pub fn CGRestorePermanentDisplayConfiguration();
+    pub fn CGDisplayCapture(display: CGDirectDisplayID) -> CGError;
+    pub fn CGDisplayRelease(display: CGDirectDisplayID) -> CGError;
+    pub fn CGConfigureDisplayFadeEffect(
+        config: CGDisplayConfigRef,
+        fadeOutSeconds: CGDisplayFadeInterval,
+        fadeInSeconds: CGDisplayFadeInterval,
+        fadeRed: f32,
+        fadeGreen: f32,
+        fadeBlue: f32,
+    ) -> CGError;
+    pub fn CGAcquireDisplayFadeReservation(
+        seconds: CGDisplayReservationInterval,
+        token: *mut CGDisplayFadeReservationToken,
+    ) -> CGError;
+    pub fn CGDisplayFade(
+        token: CGDisplayFadeReservationToken,
+        duration: CGDisplayFadeInterval,
+        startBlend: CGDisplayBlendFraction,
+        endBlend: CGDisplayBlendFraction,
+        redBlend: f32,
+        greenBlend: f32,
+        blueBlend: f32,
+        synchronous: Boolean,
+    ) -> CGError;
+    pub fn CGReleaseDisplayFadeReservation(token: CGDisplayFadeReservationToken) -> CGError;
+    pub fn CGDisplayCreateUUIDFromDisplayID(display: CGDirectDisplayID) -> CFUUIDRef;
+    pub fn CGShieldingWindowLevel() -> CGWindowLevel;
+    pub fn CGDisplaySetDisplayMode(
+        display: CGDirectDisplayID,
+        mode: CGDisplayModeRef,
+        options: CFDictionaryRef,
+    ) -> CGError;
+    pub fn CGDisplayCopyAllDisplayModes(
+        display: CGDirectDisplayID,
+        options: CFDictionaryRef,
+    ) -> CFArrayRef;
+    pub fn CGDisplayModeGetPixelWidth(mode: CGDisplayModeRef) -> usize;
+    pub fn CGDisplayModeGetPixelHeight(mode: CGDisplayModeRef) -> usize;
+    pub fn CGDisplayModeGetRefreshRate(mode: CGDisplayModeRef) -> f64;
+    pub fn CGDisplayModeCopyPixelEncoding(mode: CGDisplayModeRef) -> CFStringRef;
+    pub fn CGDisplayModeRetain(mode: CGDisplayModeRef);
+    pub fn CGDisplayModeRelease(mode: CGDisplayModeRef);
+}

src/platform_impl/macos/mod.rs

@@ -17,7 +17,7 @@ use std::{fmt, ops::Deref, sync::Arc};
 
 pub use self::{
     event_loop::{EventLoop, EventLoopWindowTarget, Proxy as EventLoopProxy},
-    monitor::MonitorHandle,
+    monitor::{MonitorHandle, VideoMode},
     window::{Id as WindowId, PlatformSpecificWindowBuilderAttributes, UnownedWindow},
 };
 use crate::{

src/platform_impl/macos/monitor.rs

@@ -1,25 +1,119 @@
 use std::{collections::VecDeque, fmt};
 
+use super::ffi;
+use crate::{
+    dpi::{PhysicalPosition, PhysicalSize},
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
+    platform_impl::platform::util::IdRef,
+};
 use cocoa::{
     appkit::NSScreen,
     base::{id, nil},
     foundation::{NSString, NSUInteger},
 };
-use core_graphics::display::{CGDirectDisplayID, CGDisplay, CGDisplayBounds, CGDisplayMode};
+use core_foundation::{
+    array::{CFArrayGetCount, CFArrayGetValueAtIndex},
+    base::{CFRelease, TCFType},
+    string::CFString,
+};
+use core_graphics::display::{CGDirectDisplayID, CGDisplay, CGDisplayBounds};
 use core_video_sys::{
     kCVReturnSuccess, kCVTimeIsIndefinite, CVDisplayLinkCreateWithCGDisplay,
     CVDisplayLinkGetNominalOutputVideoRefreshPeriod, CVDisplayLinkRelease,
 };
 
-use crate::{
+#[derive(Derivative)]
-    dpi::{PhysicalPosition, PhysicalSize},
+#[derivative(Debug, Clone, PartialEq, Hash)]
-    monitor::VideoMode,
+pub struct VideoMode {
-    platform_impl::platform::util::IdRef,
+    pub(crate) size: (u32, u32),
-};
+    pub(crate) bit_depth: u16,
+    pub(crate) refresh_rate: u16,
+    pub(crate) monitor: MonitorHandle,
+    #[derivative(Debug = "ignore", PartialEq = "ignore", Hash = "ignore")]
+    pub(crate) native_mode: NativeDisplayMode,
+}
 
-#[derive(Clone, PartialEq)]
+pub struct NativeDisplayMode(pub ffi::CGDisplayModeRef);
+
+unsafe impl Send for NativeDisplayMode {}
+
+impl Drop for NativeDisplayMode {
+    fn drop(&mut self) {
+        unsafe {
+            ffi::CGDisplayModeRelease(self.0);
+        }
+    }
+}
+
+impl Clone for NativeDisplayMode {
+    fn clone(&self) -> Self {
+        unsafe {
+            ffi::CGDisplayModeRetain(self.0);
+        }
+        NativeDisplayMode(self.0)
+    }
+}
+
+impl VideoMode {
+    pub fn size(&self) -> PhysicalSize {
+        self.size.into()
+    }
+
+    pub fn bit_depth(&self) -> u16 {
+        self.bit_depth
+    }
+
+    pub fn refresh_rate(&self) -> u16 {
+        self.refresh_rate
+    }
+
+    pub fn monitor(&self) -> RootMonitorHandle {
+        RootMonitorHandle {
+            inner: self.monitor.clone(),
+        }
+    }
+}
+
+#[derive(Clone)]
 pub struct MonitorHandle(CGDirectDisplayID);
 
+// `CGDirectDisplayID` changes on video mode change, so we cannot rely on that
+// for comparisons, but we can use `CGDisplayCreateUUIDFromDisplayID` to get an
+// unique identifier that persists even across system reboots
+impl PartialEq for MonitorHandle {
+    fn eq(&self, other: &Self) -> bool {
+        unsafe {
+            ffi::CGDisplayCreateUUIDFromDisplayID(self.0)
+                == ffi::CGDisplayCreateUUIDFromDisplayID(other.0)
+        }
+    }
+}
+
+impl Eq for MonitorHandle {}
+
+impl PartialOrd for MonitorHandle {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(&other))
+    }
+}
+
+impl Ord for MonitorHandle {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        unsafe {
+            ffi::CGDisplayCreateUUIDFromDisplayID(self.0)
+                .cmp(&ffi::CGDisplayCreateUUIDFromDisplayID(other.0))
+        }
+    }
+}
+
+impl std::hash::Hash for MonitorHandle {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        unsafe {
+            ffi::CGDisplayCreateUUIDFromDisplayID(self.0).hash(state);
+        }
+    }
+}
+
 pub fn available_monitors() -> VecDeque<MonitorHandle> {
     if let Ok(displays) = CGDisplay::active_displays() {
         let mut monitors = VecDeque::with_capacity(displays.len());
@@ -101,7 +195,7 @@ impl MonitorHandle {
         unsafe { NSScreen::backingScaleFactor(screen) as f64 }
     }
 
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+    pub fn video_modes(&self) -> impl Iterator<Item = RootVideoMode> {
         let cv_refresh_rate = unsafe {
             let mut display_link = std::ptr::null_mut();
             assert_eq!(
@@ -117,11 +211,27 @@ impl MonitorHandle {
             time.timeScale as i64 / time.timeValue
         };
 
-        CGDisplayMode::all_display_modes(self.0, std::ptr::null())
+        let monitor = self.clone();
-            .expect("failed to obtain list of display modes")
+
+        unsafe {
+            let modes = {
+                let array = ffi::CGDisplayCopyAllDisplayModes(self.0, std::ptr::null());
+                assert!(!array.is_null(), "failed to get list of display modes");
+                let array_count = CFArrayGetCount(array);
+                let modes: Vec<_> = (0..array_count)
                     .into_iter()
-            .map(move |mode| {
+                    .map(move |i| {
-                let cg_refresh_rate = mode.refresh_rate().round() as i64;
+                        let mode = CFArrayGetValueAtIndex(array, i) as *mut _;
+                        ffi::CGDisplayModeRetain(mode);
+                        mode
+                    })
+                    .collect();
+                CFRelease(array as *const _);
+                modes
+            };
+
+            modes.into_iter().map(move |mode| {
+                let cg_refresh_rate = ffi::CGDisplayModeGetRefreshRate(mode).round() as i64;
 
                 // CGDisplayModeGetRefreshRate returns 0.0 for any display that
                 // isn't a CRT
@@ -131,34 +241,55 @@ impl MonitorHandle {
                     cv_refresh_rate
                 };
 
-                VideoMode {
+                let pixel_encoding =
-                    size: (mode.width() as u32, mode.height() as u32),
+                    CFString::wrap_under_create_rule(ffi::CGDisplayModeCopyPixelEncoding(mode))
+                        .to_string();
+                let bit_depth = if pixel_encoding.eq_ignore_ascii_case(ffi::IO32BitDirectPixels) {
+                    32
+                } else if pixel_encoding.eq_ignore_ascii_case(ffi::IO16BitDirectPixels) {
+                    16
+                } else if pixel_encoding.eq_ignore_ascii_case(ffi::kIO30BitDirectPixels) {
+                    30
+                } else {
+                    unimplemented!()
+                };
+
+                let video_mode = VideoMode {
+                    size: (
+                        ffi::CGDisplayModeGetPixelWidth(mode) as u32,
+                        ffi::CGDisplayModeGetPixelHeight(mode) as u32,
+                    ),
                     refresh_rate: refresh_rate as u16,
-                    bit_depth: mode.bit_depth() as u16,
+                    bit_depth,
-                }
+                    monitor: monitor.clone(),
+                    native_mode: NativeDisplayMode(mode),
+                };
+
+                RootVideoMode { video_mode }
             })
         }
+    }
 
     pub(crate) fn ns_screen(&self) -> Option<id> {
         unsafe {
-            let native_id = self.native_identifier();
+            let uuid = ffi::CGDisplayCreateUUIDFromDisplayID(self.0);
             let screens = NSScreen::screens(nil);
             let count: NSUInteger = msg_send![screens, count];
             let key = IdRef::new(NSString::alloc(nil).init_str("NSScreenNumber"));
-            let mut matching_screen: Option<id> = None;
             for i in 0..count {
                 let screen = msg_send![screens, objectAtIndex: i as NSUInteger];
                 let device_description = NSScreen::deviceDescription(screen);
                 let value: id = msg_send![device_description, objectForKey:*key];
                 if value != nil {
-                    let screen_number: NSUInteger = msg_send![value, unsignedIntegerValue];
+                    let other_native_id: NSUInteger = msg_send![value, unsignedIntegerValue];
-                    if screen_number as u32 == native_id {
+                    let other_uuid =
-                        matching_screen = Some(screen);
+                        ffi::CGDisplayCreateUUIDFromDisplayID(other_native_id as CGDirectDisplayID);
-                        break;
+                    if uuid == other_uuid {
+                        return Some(screen);
                     }
                 }
             }
-            matching_screen
+            None
         }
     }
 }

src/platform_impl/macos/observer.rs

@@ -1,6 +1,6 @@
 use std::{self, os::raw::*, ptr, time::Instant};
 
-use crate::platform_impl::platform::app_state::AppState;
+use crate::platform_impl::platform::{app_state::AppState, ffi};
 
 #[link(name = "CoreFoundation", kind = "framework")]
 extern "C" {
@@ -13,7 +13,7 @@ extern "C" {
     pub fn CFRunLoopObserverCreate(
         allocator: CFAllocatorRef,
         activities: CFOptionFlags,
-        repeats: Boolean,
+        repeats: ffi::Boolean,
         order: CFIndex,
         callout: CFRunLoopObserverCallBack,
         context: *mut CFRunLoopObserverContext,
@@ -51,11 +51,6 @@ extern "C" {
     pub fn CFRelease(cftype: *const c_void);
 }
 
-pub type Boolean = u8;
-#[allow(dead_code)]
-const FALSE: Boolean = 0;
-const TRUE: Boolean = 1;
-
 pub enum CFAllocator {}
 pub type CFAllocatorRef = *mut CFAllocator;
 pub enum CFRunLoop {}
@@ -102,7 +97,7 @@ pub struct CFRunLoopSourceContext {
     pub retain: extern "C" fn(*const c_void) -> *const c_void,
     pub release: extern "C" fn(*const c_void),
     pub copyDescription: extern "C" fn(*const c_void) -> CFStringRef,
-    pub equal: extern "C" fn(*const c_void, *const c_void) -> Boolean,
+    pub equal: extern "C" fn(*const c_void, *const c_void) -> ffi::Boolean,
     pub hash: extern "C" fn(*const c_void) -> CFHashCode,
     pub schedule: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
     pub cancel: extern "C" fn(*mut c_void, CFRunLoopRef, CFRunLoopMode),
@@ -162,7 +157,7 @@ impl RunLoop {
         let observer = CFRunLoopObserverCreate(
             ptr::null_mut(),
             flags,
-            TRUE,     // Indicates we want this to run repeatedly
+            ffi::TRUE, // Indicates we want this to run repeatedly
             priority,  // The lower the value, the sooner this will run
             handler,
             ptr::null_mut(),

src/platform_impl/macos/util/async.rs

@@ -206,7 +206,10 @@ extern "C" fn toggle_full_screen_callback(context: *mut c_void) {
                     }
                 }
             }
-
+            // Window level must be restored from `CGShieldingWindowLevel()
+            // + 1` back to normal in order for `toggleFullScreen` to do
+            // anything
+            context.ns_window.setLevel_(0);
             context.ns_window.toggleFullScreen_(nil);
         }
         Box::from_raw(context_ptr);

src/platform_impl/macos/window.rs

@@ -8,6 +8,23 @@ use std::{
     },
 };
 
+use crate::{
+    dpi::{LogicalPosition, LogicalSize},
+    error::{ExternalError, NotSupportedError, OsError as RootOsError},
+    icon::Icon,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
+    platform::macos::{ActivationPolicy, RequestUserAttentionType, WindowExtMacOS},
+    platform_impl::platform::{
+        app_state::AppState,
+        ffi,
+        monitor::{self, MonitorHandle, VideoMode},
+        util::{self, IdRef},
+        view::{self, new_view},
+        window_delegate::new_delegate,
+        OsError,
+    },
+    window::{CursorIcon, Fullscreen, WindowAttributes, WindowId as RootWindowId},
+};
 use cocoa::{
     appkit::{
         self, CGFloat, NSApp, NSApplication, NSApplicationActivationPolicy,
@@ -17,30 +34,12 @@ use cocoa::{
     base::{id, nil},
     foundation::{NSAutoreleasePool, NSDictionary, NSPoint, NSRect, NSSize, NSString},
 };
-use core_graphics::display::CGDisplay;
+use core_graphics::display::{CGDisplay, CGDisplayMode};
 use objc::{
     declare::ClassDecl,
     runtime::{Class, Object, Sel, BOOL, NO, YES},
 };
 
-use crate::{
-    dpi::{LogicalPosition, LogicalSize},
-    error::{ExternalError, NotSupportedError, OsError as RootOsError},
-    icon::Icon,
-    monitor::MonitorHandle as RootMonitorHandle,
-    platform::macos::{ActivationPolicy, RequestUserAttentionType, WindowExtMacOS},
-    platform_impl::platform::{
-        app_state::AppState,
-        ffi,
-        monitor::{self, MonitorHandle},
-        util::{self, IdRef},
-        view::{self, new_view},
-        window_delegate::new_delegate,
-        OsError,
-    },
-    window::{CursorIcon, WindowAttributes, WindowId as RootWindowId},
-};
-
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Id(pub usize);
 
@@ -119,11 +118,14 @@ fn create_window(
     unsafe {
         let pool = NSAutoreleasePool::new(nil);
         let screen = match attrs.fullscreen {
-            Some(ref monitor_id) => {
+            Some(Fullscreen::Borderless(RootMonitorHandle { inner: ref monitor }))
-                let monitor_screen = monitor_id.inner.ns_screen();
+            | Some(Fullscreen::Exclusive(RootVideoMode {
+                video_mode: VideoMode { ref monitor, .. },
+            })) => {
+                let monitor_screen = monitor.ns_screen();
                 Some(monitor_screen.unwrap_or(appkit::NSScreen::mainScreen(nil)))
             }
-            _ => None,
+            None => None,
         };
         let frame = match screen {
             Some(screen) => appkit::NSScreen::frame(screen),
@@ -239,12 +241,15 @@ lazy_static! {
 #[derive(Default)]
 pub struct SharedState {
     pub resizable: bool,
-    pub fullscreen: Option<RootMonitorHandle>,
+    pub fullscreen: Option<Fullscreen>,
     pub maximized: bool,
     pub standard_frame: Option<NSRect>,
     is_simple_fullscreen: bool,
     pub saved_style: Option<NSWindowStyleMask>,
+    /// Presentation options saved before entering `set_simple_fullscreen`, and
+    /// restored upon exiting it
     save_presentation_opts: Option<NSApplicationPresentationOptions>,
+    pub saved_desktop_display_mode: Option<(CGDisplay, CGDisplayMode)>,
 }
 
 impl SharedState {
@@ -362,16 +367,7 @@ impl UnownedWindow {
         let delegate = new_delegate(&window, fullscreen.is_some());
 
         // Set fullscreen mode after we setup everything
-        if let Some(monitor) = fullscreen {
+        window.set_fullscreen(fullscreen);
-            if monitor.inner != window.current_monitor().inner {
-                // To do this with native fullscreen, we probably need to
-                // warp the window... while we could use
-                // `enterFullScreenMode`, they're idiomatically different
-                // fullscreen modes, so we'd have to support both anyway.
-                unimplemented!();
-            }
-            window.set_fullscreen(Some(monitor));
-        }
 
         // Setting the window as key has to happen *after* we set the fullscreen
         // state, since otherwise we'll briefly see the window at normal size
@@ -601,22 +597,44 @@ impl UnownedWindow {
         }
     }
 
+    /// This is called when the window is exiting fullscreen, whether by the
+    /// user clicking on the green fullscreen button or programmatically by
+    /// `toggleFullScreen:`
     pub(crate) fn restore_state_from_fullscreen(&self) {
-        let maximized = {
         trace!("Locked shared state in `restore_state_from_fullscreen`");
         let mut shared_state_lock = self.shared_state.lock().unwrap();
 
         shared_state_lock.fullscreen = None;
 
+        let maximized = shared_state_lock.maximized;
         let mask = self.saved_style(&mut *shared_state_lock);
 
-            self.set_style_mask_async(mask);
+        drop(shared_state_lock);
-            shared_state_lock.maximized
-        };
         trace!("Unocked shared state in `restore_state_from_fullscreen`");
+
+        self.set_style_mask_async(mask);
         self.set_maximized(maximized);
     }
 
+    fn restore_display_mode(&self) {
+        trace!("Locked shared state in `restore_display_mode`");
+        let shared_state_lock = self.shared_state.lock().unwrap();
+
+        if let Some(Fullscreen::Exclusive(RootVideoMode { ref video_mode })) =
+            shared_state_lock.fullscreen
+        {
+            unsafe {
+                ffi::CGRestorePermanentDisplayConfiguration();
+                assert_eq!(
+                    ffi::CGDisplayRelease(video_mode.monitor().inner.native_identifier()),
+                    ffi::kCGErrorSuccess
+                );
+            }
+        }
+
+        trace!("Unlocked shared state in `restore_display_mode`");
+    }
+
     #[inline]
     pub fn set_maximized(&self, maximized: bool) {
         let is_zoomed = self.is_zoomed();
@@ -634,44 +652,159 @@ impl UnownedWindow {
     }
 
     #[inline]
-    pub fn fullscreen(&self) -> Option<RootMonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         let shared_state_lock = self.shared_state.lock().unwrap();
         shared_state_lock.fullscreen.clone()
     }
 
     #[inline]
-    /// TODO: Right now set_fullscreen do not work on switching monitors
+    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
-    /// in fullscreen mode
+        trace!("Locked shared state in `set_fullscreen`");
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
         let shared_state_lock = self.shared_state.lock().unwrap();
         if shared_state_lock.is_simple_fullscreen {
+            trace!("Unlocked shared state in `set_fullscreen`");
             return;
         }
-
+        let old_fullscreen = shared_state_lock.fullscreen.clone();
-        let not_fullscreen = {
+        if fullscreen == old_fullscreen {
-            trace!("Locked shared state in `set_fullscreen`");
+            trace!("Unlocked shared state in `set_fullscreen`");
-            let current = &shared_state_lock.fullscreen;
+            return;
-            match (current, monitor) {
-                (&Some(ref a), Some(ref b)) if a.inner != b.inner => {
-                    // Our best bet is probably to move to the origin of the
-                    // target monitor.
-                    unimplemented!()
-                }
-                (&None, None) | (&Some(_), Some(_)) => return,
-                _ => (),
         }
         trace!("Unlocked shared state in `set_fullscreen`");
-            current.is_none()
+        drop(shared_state_lock);
-        };
+
+        // If the fullscreen is on a different monitor, we must move the window
+        // to that monitor before we toggle fullscreen (as `toggleFullScreen`
+        // does not take a screen parameter, but uses the current screen)
+        if let Some(ref fullscreen) = fullscreen {
+            let new_screen = match fullscreen {
+                Fullscreen::Borderless(RootMonitorHandle { inner: ref monitor }) => monitor,
+                Fullscreen::Exclusive(RootVideoMode {
+                    video_mode: VideoMode { ref monitor, .. },
+                }) => monitor,
+            }
+            .ns_screen()
+            .unwrap();
 
             unsafe {
+                let old_screen = NSWindow::screen(*self.ns_window);
+                if old_screen != new_screen {
+                    let mut screen_frame: NSRect = msg_send![new_screen, frame];
+                    // The coordinate system here has its origin at bottom-left
+                    // and Y goes up
+                    screen_frame.origin.y += screen_frame.size.height;
+                    util::set_frame_top_left_point_async(*self.ns_window, screen_frame.origin);
+                }
+            }
+        }
+
+        if let Some(Fullscreen::Exclusive(ref video_mode)) = fullscreen {
+            // Note: `enterFullScreenMode:withOptions:` seems to do the exact
+            // same thing as we're doing here (captures the display, sets the
+            // video mode, and hides the menu bar and dock), with the exception
+            // of that I couldn't figure out how to set the display mode with
+            // it. I think `enterFullScreenMode:withOptions:` is still using the
+            // older display mode API where display modes were of the type
+            // `CFDictionary`, but this has changed, so we can't obtain the
+            // correct parameter for this any longer. Apple's code samples for
+            // this function seem to just pass in "YES" for the display mode
+            // parameter, which is not consistent with the docs saying that it
+            // takes a `NSDictionary`..
+
+            let display_id = video_mode.monitor().inner.native_identifier();
+
+            let mut fade_token = ffi::kCGDisplayFadeReservationInvalidToken;
+
+            unsafe {
+                // Fade to black (and wait for the fade to complete) to hide the
+                // flicker from capturing the display and switching display mode
+                if ffi::CGAcquireDisplayFadeReservation(5.0, &mut fade_token)
+                    == ffi::kCGErrorSuccess
+                {
+                    ffi::CGDisplayFade(
+                        fade_token,
+                        0.3,
+                        ffi::kCGDisplayBlendNormal,
+                        ffi::kCGDisplayBlendSolidColor,
+                        0.0,
+                        0.0,
+                        0.0,
+                        ffi::TRUE,
+                    );
+                }
+
+                assert_eq!(ffi::CGDisplayCapture(display_id), ffi::kCGErrorSuccess);
+            }
+
+            unsafe {
+                let result = ffi::CGDisplaySetDisplayMode(
+                    display_id,
+                    video_mode.video_mode.native_mode.0,
+                    std::ptr::null(),
+                );
+                assert!(result == ffi::kCGErrorSuccess, "failed to set video mode");
+
+                // After the display has been configured, fade back in
+                // asynchronously
+                if fade_token != ffi::kCGDisplayFadeReservationInvalidToken {
+                    ffi::CGDisplayFade(
+                        fade_token,
+                        0.6,
+                        ffi::kCGDisplayBlendSolidColor,
+                        ffi::kCGDisplayBlendNormal,
+                        0.0,
+                        0.0,
+                        0.0,
+                        ffi::FALSE,
+                    );
+                    ffi::CGReleaseDisplayFadeReservation(fade_token);
+                }
+            }
+        }
+
+        match (&old_fullscreen, &fullscreen) {
+            (&Some(Fullscreen::Borderless(_)), &Some(Fullscreen::Exclusive(_))) => unsafe {
+                // If we're already in fullscreen mode, calling
+                // `CGDisplayCapture` will place the shielding window on top of
+                // our window, which results in a black display and is not what
+                // we want. So, we must place our window on top of the shielding
+                // window. Unfortunately, this also makes our window be on top
+                // of the menu bar, and this looks broken, so we must make sure
+                // that the menu bar is disabled. This is done in the window
+                // delegate in `window:willUseFullScreenPresentationOptions:`.
+                msg_send![*self.ns_window, setLevel: ffi::CGShieldingWindowLevel() + 1];
+            },
+            (&Some(Fullscreen::Exclusive(_)), &None) => unsafe {
+                self.restore_display_mode();
+
                 util::toggle_full_screen_async(
                     *self.ns_window,
                     *self.ns_view,
-                not_fullscreen,
+                    old_fullscreen.is_none(),
                     Arc::downgrade(&self.shared_state),
-            )
+                );
-        };
+            },
+            (&Some(Fullscreen::Exclusive(_)), &Some(Fullscreen::Borderless(_))) => {
+                self.restore_display_mode();
+            }
+            (&None, &Some(Fullscreen::Exclusive(_)))
+            | (&None, &Some(Fullscreen::Borderless(_)))
+            | (&Some(Fullscreen::Borderless(_)), &None) => unsafe {
+                // Wish it were this simple for all cases
+                util::toggle_full_screen_async(
+                    *self.ns_window,
+                    *self.ns_view,
+                    old_fullscreen.is_none(),
+                    Arc::downgrade(&self.shared_state),
+                );
+            },
+            _ => (),
+        }
+
+        trace!("Locked shared state in `set_fullscreen`");
+        let mut shared_state_lock = self.shared_state.lock().unwrap();
+        shared_state_lock.fullscreen = fullscreen.clone();
+        trace!("Unlocked shared state in `set_fullscreen`");
     }
 
     #[inline]

src/platform_impl/macos/window_delegate.rs

@@ -5,9 +5,9 @@ use std::{
 };
 
 use cocoa::{
-    appkit::{self, NSView, NSWindow},
+    appkit::{self, NSApplicationPresentationOptions, NSView, NSWindow},
     base::{id, nil},
-    foundation::NSAutoreleasePool,
+    foundation::{NSAutoreleasePool, NSUInteger},
 };
 use objc::{
     declare::ClassDecl,
@@ -22,7 +22,7 @@ use crate::{
         util::{self, IdRef},
         window::{get_window_id, UnownedWindow},
     },
-    window::WindowId,
+    window::{Fullscreen, WindowId},
 };
 
 pub struct WindowDelegateState {
@@ -182,6 +182,11 @@ lazy_static! {
             dragging_exited as extern "C" fn(&Object, Sel, id),
         );
 
+        decl.add_method(
+            sel!(window:willUseFullScreenPresentationOptions:),
+            window_will_use_fullscreen_presentation_options
+                as extern "C" fn(&Object, Sel, id, NSUInteger) -> NSUInteger,
+        );
         decl.add_method(
             sel!(windowDidEnterFullScreen:),
             window_did_enter_fullscreen as extern "C" fn(&Object, Sel, id),
@@ -408,6 +413,26 @@ extern "C" fn window_will_enter_fullscreen(this: &Object, _: Sel, _: id) {
     trace!("Completed `windowWillEnterFullscreen:`");
 }
 
+extern "C" fn window_will_use_fullscreen_presentation_options(
+    _this: &Object,
+    _: Sel,
+    _: id,
+    _proposed_options: NSUInteger,
+) -> NSUInteger {
+    // Generally, games will want to disable the menu bar and the dock. Ideally,
+    // this would be configurable by the user. Unfortunately because of our
+    // `CGShieldingWindowLevel() + 1` hack (see `set_fullscreen`), our window is
+    // placed on top of the menu bar in exclusive fullscreen mode. This looks
+    // broken so we always disable the menu bar in exclusive fullscreen. We may
+    // still want to make this configurable for borderless fullscreen. Right now
+    // we don't, for consistency. If we do, it should be documented that the
+    // user-provided options are ignored in exclusive fullscreen.
+    (NSApplicationPresentationOptions::NSApplicationPresentationFullScreen
+        | NSApplicationPresentationOptions::NSApplicationPresentationHideDock
+        | NSApplicationPresentationOptions::NSApplicationPresentationHideMenuBar)
+        .bits()
+}
+
 /// Invoked when entered fullscreen
 extern "C" fn window_did_enter_fullscreen(this: &Object, _: Sel, _: id) {
     trace!("Triggered `windowDidEnterFullscreen:`");
@@ -415,8 +440,21 @@ extern "C" fn window_did_enter_fullscreen(this: &Object, _: Sel, _: id) {
         state.with_window(|window| {
             let monitor = window.current_monitor();
             trace!("Locked shared state in `window_did_enter_fullscreen`");
-            window.shared_state.lock().unwrap().fullscreen = Some(monitor);
+            let mut shared_state = window.shared_state.lock().unwrap();
-            trace!("Unlocked shared state in `window_will_enter_fullscreen`");
+            match shared_state.fullscreen {
+                // Exclusive mode sets the state in `set_fullscreen` as the user
+                // can't enter exclusive mode by other means (like the
+                // fullscreen button on the window decorations)
+                Some(Fullscreen::Exclusive(_)) => (),
+                // `window_did_enter_fullscreen` was triggered and we're already
+                // in fullscreen, so we must've reached here by `set_fullscreen`
+                // as it updates the state
+                Some(Fullscreen::Borderless(_)) => (),
+                // Otherwise, we must've reached fullscreen by the user clicking
+                // on the green fullscreen button. Update state!
+                None => shared_state.fullscreen = Some(Fullscreen::Borderless(monitor)),
+            }
+            trace!("Unlocked shared state in `window_did_enter_fullscreen`");
         });
         state.initial_fullscreen = false;
     });

src/platform_impl/windows/mod.rs

@@ -4,7 +4,7 @@ use winapi::{self, shared::windef::HWND};
 
 pub use self::{
     event_loop::{EventLoop, EventLoopProxy, EventLoopWindowTarget},
-    monitor::MonitorHandle,
+    monitor::{MonitorHandle, VideoMode},
     window::Window,
 };
 

src/platform_impl/windows/monitor.rs

@@ -3,54 +3,64 @@ use winapi::{
         minwindef::{BOOL, DWORD, LPARAM, TRUE, WORD},
         windef::{HDC, HMONITOR, HWND, LPRECT, POINT},
     },
-    um::{wingdi, winnt::LONG, winuser},
+    um::{wingdi, winuser},
 };
 
 use std::{
-    collections::{HashSet, VecDeque},
+    collections::{BTreeSet, VecDeque},
     io, mem, ptr,
 };
 
 use super::{util, EventLoop};
 use crate::{
     dpi::{PhysicalPosition, PhysicalSize},
-    monitor::VideoMode,
+    monitor::{MonitorHandle as RootMonitorHandle, VideoMode as RootVideoMode},
     platform_impl::platform::{
         dpi::{dpi_to_scale_factor, get_monitor_dpi},
         window::Window,
     },
 };
 
-/// Win32 implementation of the main `MonitorHandle` object.
 #[derive(Derivative)]
-#[derivative(Debug, Clone)]
+#[derivative(Debug, Clone, Eq, PartialEq, Hash)]
-pub struct MonitorHandle {
+pub struct VideoMode {
-    /// Monitor handle.
+    pub(crate) size: (u32, u32),
-    hmonitor: HMonitor,
+    pub(crate) bit_depth: u16,
-    #[derivative(Debug = "ignore")]
+    pub(crate) refresh_rate: u16,
-    monitor_info: winuser::MONITORINFOEXW,
+    pub(crate) monitor: MonitorHandle,
-    /// The system name of the monitor.
+    #[derivative(Debug = "ignore", PartialEq = "ignore", Hash = "ignore")]
-    monitor_name: String,
+    pub(crate) native_video_mode: wingdi::DEVMODEW,
-    /// True if this is the primary monitor.
-    primary: bool,
-    /// The position of the monitor in pixels on the desktop.
-    ///
-    /// A window that is positioned at these coordinates will overlap the monitor.
-    position: (i32, i32),
-    /// The current resolution in pixels on the monitor.
-    dimensions: (u32, u32),
-    /// DPI scale factor.
-    hidpi_factor: f64,
 }
 
+impl VideoMode {
+    pub fn size(&self) -> PhysicalSize {
+        self.size.into()
+    }
+
+    pub fn bit_depth(&self) -> u16 {
+        self.bit_depth
+    }
+
+    pub fn refresh_rate(&self) -> u16 {
+        self.refresh_rate
+    }
+
+    pub fn monitor(&self) -> RootMonitorHandle {
+        RootMonitorHandle {
+            inner: self.monitor.clone(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
+pub struct MonitorHandle(HMONITOR);
+
 // Send is not implemented for HMONITOR, we have to wrap it and implement it manually.
 // For more info see:
 // https://github.com/retep998/winapi-rs/issues/360
 // https://github.com/retep998/winapi-rs/issues/396
-#[derive(Debug, Clone)]
-struct HMonitor(HMONITOR);
 
-unsafe impl Send for HMonitor {}
+unsafe impl Send for MonitorHandle {}
 
 unsafe extern "system" fn monitor_enum_proc(
     hmonitor: HMONITOR,
@@ -59,7 +69,7 @@ unsafe extern "system" fn monitor_enum_proc(
     data: LPARAM,
 ) -> BOOL {
     let monitors = data as *mut VecDeque<MonitorHandle>;
-    (*monitors).push_back(MonitorHandle::from_hmonitor(hmonitor));
+    (*monitors).push_back(MonitorHandle::new(hmonitor));
     TRUE // continue enumeration
 }
 
@@ -79,12 +89,12 @@ pub fn available_monitors() -> VecDeque<MonitorHandle> {
 pub fn primary_monitor() -> MonitorHandle {
     const ORIGIN: POINT = POINT { x: 0, y: 0 };
     let hmonitor = unsafe { winuser::MonitorFromPoint(ORIGIN, winuser::MONITOR_DEFAULTTOPRIMARY) };
-    MonitorHandle::from_hmonitor(hmonitor)
+    MonitorHandle::new(hmonitor)
 }
 
 pub fn current_monitor(hwnd: HWND) -> MonitorHandle {
     let hmonitor = unsafe { winuser::MonitorFromWindow(hwnd, winuser::MONITOR_DEFAULTTONEAREST) };
-    MonitorHandle::from_hmonitor(hmonitor)
+    MonitorHandle::new(hmonitor)
 }
 
 impl<T> EventLoop<T> {
@@ -125,73 +135,69 @@ pub(crate) fn get_monitor_info(hmonitor: HMONITOR) -> Result<winuser::MONITORINF
 }
 
 impl MonitorHandle {
-    pub(crate) fn from_hmonitor(hmonitor: HMONITOR) -> Self {
+    pub(crate) fn new(hmonitor: HMONITOR) -> Self {
-        let monitor_info = get_monitor_info(hmonitor).expect("`GetMonitorInfoW` failed");
+        MonitorHandle(hmonitor)
-        let place = monitor_info.rcMonitor;
-        let dimensions = (
-            (place.right - place.left) as u32,
-            (place.bottom - place.top) as u32,
-        );
-        MonitorHandle {
-            hmonitor: HMonitor(hmonitor),
-            monitor_name: util::wchar_ptr_to_string(monitor_info.szDevice.as_ptr()),
-            primary: util::has_flag(monitor_info.dwFlags, winuser::MONITORINFOF_PRIMARY),
-            position: (place.left as i32, place.top as i32),
-            dimensions,
-            hidpi_factor: dpi_to_scale_factor(get_monitor_dpi(hmonitor).unwrap_or(96)),
-            monitor_info,
-        }
     }
 
     pub(crate) fn contains_point(&self, point: &POINT) -> bool {
-        let left = self.position.0 as LONG;
+        let monitor_info = get_monitor_info(self.0).unwrap();
-        let right = left + self.dimensions.0 as LONG;
+        point.x >= monitor_info.rcMonitor.left
-        let top = self.position.1 as LONG;
+            && point.x <= monitor_info.rcMonitor.right
-        let bottom = top + self.dimensions.1 as LONG;
+            && point.y >= monitor_info.rcMonitor.top
-        point.x >= left && point.x <= right && point.y >= top && point.y <= bottom
+            && point.y <= monitor_info.rcMonitor.bottom
     }
 
     #[inline]
     pub fn name(&self) -> Option<String> {
-        Some(self.monitor_name.clone())
+        let monitor_info = get_monitor_info(self.0).unwrap();
+        Some(util::wchar_ptr_to_string(monitor_info.szDevice.as_ptr()))
     }
 
     #[inline]
     pub fn native_identifier(&self) -> String {
-        self.monitor_name.clone()
+        self.name().unwrap()
     }
 
     #[inline]
     pub fn hmonitor(&self) -> HMONITOR {
-        self.hmonitor.0
+        self.0
     }
 
     #[inline]
     pub fn size(&self) -> PhysicalSize {
-        self.dimensions.into()
+        let monitor_info = get_monitor_info(self.0).unwrap();
+        PhysicalSize {
+            width: (monitor_info.rcMonitor.right - monitor_info.rcMonitor.left) as f64,
+            height: (monitor_info.rcMonitor.bottom - monitor_info.rcMonitor.top) as f64,
+        }
     }
 
     #[inline]
     pub fn position(&self) -> PhysicalPosition {
-        self.position.into()
+        let monitor_info = get_monitor_info(self.0).unwrap();
+        PhysicalPosition {
+            x: monitor_info.rcMonitor.left as f64,
+            y: monitor_info.rcMonitor.top as f64,
+        }
     }
 
     #[inline]
     pub fn hidpi_factor(&self) -> f64 {
-        self.hidpi_factor
+        dpi_to_scale_factor(get_monitor_dpi(self.0).unwrap_or(96))
     }
 
     #[inline]
-    pub fn video_modes(&self) -> impl Iterator<Item = VideoMode> {
+    pub fn video_modes(&self) -> impl Iterator<Item = RootVideoMode> {
         // EnumDisplaySettingsExW can return duplicate values (or some of the
         // fields are probably changing, but we aren't looking at those fields
-        // anyway), so we're using a HashSet deduplicate
+        // anyway), so we're using a BTreeSet deduplicate
-        let mut modes = HashSet::new();
+        let mut modes = BTreeSet::new();
         let mut i = 0;
 
         loop {
             unsafe {
-                let device_name = self.monitor_info.szDevice.as_ptr();
+                let monitor_info = get_monitor_info(self.0).unwrap();
+                let device_name = monitor_info.szDevice.as_ptr();
                 let mut mode: wingdi::DEVMODEW = mem::zeroed();
                 mode.dmSize = mem::size_of_val(&mode) as WORD;
                 if winuser::EnumDisplaySettingsExW(device_name, i, &mut mode, 0) == 0 {
@@ -205,10 +211,14 @@ impl MonitorHandle {
                     | wingdi::DM_DISPLAYFREQUENCY;
                 assert!(mode.dmFields & REQUIRED_FIELDS == REQUIRED_FIELDS);
 
-                modes.insert(VideoMode {
+                modes.insert(RootVideoMode {
+                    video_mode: VideoMode {
                         size: (mode.dmPelsWidth, mode.dmPelsHeight),
                         bit_depth: mode.dmBitsPerPel as u16,
                         refresh_rate: mode.dmDisplayFrequency as u16,
+                        monitor: self.clone(),
+                        native_video_mode: mode,
+                    },
                 });
             }
         }

src/platform_impl/windows/window.rs

@@ -46,7 +46,7 @@ use crate::{
         window_state::{CursorFlags, SavedWindow, WindowFlags, WindowState},
         PlatformSpecificWindowBuilderAttributes, WindowId,
     },
-    window::{CursorIcon, Icon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, Icon, WindowAttributes},
 };
 
 /// The Win32 implementation of the main `Window` object.
@@ -327,7 +327,7 @@ impl Window {
         let window_state = Arc::clone(&self.window_state);
 
         self.thread_executor.execute_in_thread(move || {
-            WindowState::set_window_flags(window_state.lock(), window.0, None, |f| {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
                 f.set(WindowFlags::RESIZABLE, resizable)
             });
         });
@@ -421,81 +421,178 @@ impl Window {
         let window_state = Arc::clone(&self.window_state);
 
         self.thread_executor.execute_in_thread(move || {
-            WindowState::set_window_flags(window_state.lock(), window.0, None, |f| {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
                 f.set(WindowFlags::MAXIMIZED, maximized)
             });
         });
     }
 
     #[inline]
-    pub fn fullscreen(&self) -> Option<RootMonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         let window_state = self.window_state.lock();
         window_state.fullscreen.clone()
     }
 
     #[inline]
-    pub fn set_fullscreen(&self, monitor: Option<RootMonitorHandle>) {
+    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
-        unsafe {
         let window = self.window.clone();
         let window_state = Arc::clone(&self.window_state);
 
-            match &monitor {
+        let mut window_state_lock = window_state.lock();
-                &Some(RootMonitorHandle { ref inner }) => {
+        let old_fullscreen = window_state_lock.fullscreen.clone();
-                    let (x, y): (i32, i32) = inner.position().into();
+        if window_state_lock.fullscreen == fullscreen {
-                    let (width, height): (u32, u32) = inner.size().into();
+            return;
+        }
+        window_state_lock.fullscreen = fullscreen.clone();
+        drop(window_state_lock);
 
-                    let mut monitor = monitor.clone();
         self.thread_executor.execute_in_thread(move || {
             let mut window_state_lock = window_state.lock();
 
-                        let client_rect =
+            // Save window bounds before entering fullscreen
-                            util::get_client_rect(window.0).expect("get client rect failed!");
+            match (&old_fullscreen, &fullscreen) {
+                (&None, &Some(_)) => {
+                    let client_rect = util::get_client_rect(window.0).unwrap();
                     window_state_lock.saved_window = Some(SavedWindow {
                         client_rect,
                         dpi_factor: window_state_lock.dpi_factor,
                     });
-
-                        window_state_lock.fullscreen = monitor.take();
-                        WindowState::refresh_window_state(
-                            window_state_lock,
-                            window.0,
-                            Some(RECT {
-                                left: x,
-                                top: y,
-                                right: x + width as c_int,
-                                bottom: y + height as c_int,
-                            }),
-                        );
-
-                        mark_fullscreen(window.0, true);
-                    });
                 }
-                &None => {
+                _ => (),
-                    self.thread_executor.execute_in_thread(move || {
+            }
-                        let mut window_state_lock = window_state.lock();
-                        window_state_lock.fullscreen = None;
 
+            // Change video mode if we're transitioning to or from exclusive
+            // fullscreen
+            match (&old_fullscreen, &fullscreen) {
+                (&None, &Some(Fullscreen::Exclusive(ref video_mode)))
+                | (
+                    &Some(Fullscreen::Borderless(_)),
+                    &Some(Fullscreen::Exclusive(ref video_mode)),
+                )
+                | (&Some(Fullscreen::Exclusive(_)), &Some(Fullscreen::Exclusive(ref video_mode))) =>
+                {
+                    let monitor = video_mode.monitor();
+
+                    let mut display_name = OsStr::new(&monitor.inner.native_identifier())
+                        .encode_wide()
+                        .collect::<Vec<_>>();
+                    // `encode_wide` does not add a null-terminator but
+                    // `ChangeDisplaySettingsExW` requires a null-terminated
+                    // string, so add it
+                    display_name.push(0);
+
+                    let mut native_video_mode = video_mode.video_mode.native_video_mode.clone();
+
+                    let res = unsafe {
+                        winuser::ChangeDisplaySettingsExW(
+                            display_name.as_ptr(),
+                            &mut native_video_mode,
+                            std::ptr::null_mut(),
+                            winuser::CDS_FULLSCREEN,
+                            std::ptr::null_mut(),
+                        )
+                    };
+
+                    debug_assert!(res != winuser::DISP_CHANGE_BADFLAGS);
+                    debug_assert!(res != winuser::DISP_CHANGE_BADMODE);
+                    debug_assert!(res != winuser::DISP_CHANGE_BADPARAM);
+                    debug_assert!(res != winuser::DISP_CHANGE_FAILED);
+                    assert_eq!(res, winuser::DISP_CHANGE_SUCCESSFUL);
+                }
+                (&Some(Fullscreen::Exclusive(_)), &None)
+                | (&Some(Fullscreen::Exclusive(_)), &Some(Fullscreen::Borderless(_))) => {
+                    let res = unsafe {
+                        winuser::ChangeDisplaySettingsExW(
+                            std::ptr::null_mut(),
+                            std::ptr::null_mut(),
+                            std::ptr::null_mut(),
+                            winuser::CDS_FULLSCREEN,
+                            std::ptr::null_mut(),
+                        )
+                    };
+
+                    debug_assert!(res != winuser::DISP_CHANGE_BADFLAGS);
+                    debug_assert!(res != winuser::DISP_CHANGE_BADMODE);
+                    debug_assert!(res != winuser::DISP_CHANGE_BADPARAM);
+                    debug_assert!(res != winuser::DISP_CHANGE_FAILED);
+                    assert_eq!(res, winuser::DISP_CHANGE_SUCCESSFUL);
+                }
+                _ => (),
+            }
+
+            unsafe {
+                // There are some scenarios where calling `ChangeDisplaySettingsExW` takes long
+                // enough to execute that the DWM thinks our program has frozen and takes over
+                // our program's window. When that happens, the `SetWindowPos` call below gets
+                // eaten and the window doesn't get set to the proper fullscreen position.
+                //
+                // Calling `PeekMessageW` here notifies Windows that our process is still running
+                // fine, taking control back from the DWM and ensuring that the `SetWindowPos` call
+                // below goes through.
+                let mut msg = mem::zeroed();
+                winuser::PeekMessageW(&mut msg, ptr::null_mut(), 0, 0, 0);
+            }
+
+            // Update window style
+            WindowState::set_window_flags(window_state_lock, window.0, |f| {
+                f.set(WindowFlags::MARKER_FULLSCREEN, fullscreen.is_some())
+            });
+
+            // Update window bounds
+            match &fullscreen {
+                Some(fullscreen) => {
+                    let monitor = match fullscreen {
+                        Fullscreen::Exclusive(ref video_mode) => video_mode.monitor(),
+                        Fullscreen::Borderless(ref monitor) => monitor.clone(),
+                    };
+
+                    let position: (i32, i32) = monitor.position().into();
+                    let size: (u32, u32) = monitor.size().into();
+
+                    unsafe {
+                        winuser::SetWindowPos(
+                            window.0,
+                            ptr::null_mut(),
+                            position.0,
+                            position.1,
+                            size.0 as i32,
+                            size.1 as i32,
+                            winuser::SWP_ASYNCWINDOWPOS | winuser::SWP_NOZORDER,
+                        );
+                        winuser::UpdateWindow(window.0);
+                    }
+                }
+                None => {
+                    let mut window_state_lock = window_state.lock();
                     if let Some(SavedWindow {
                         client_rect,
                         dpi_factor,
-                        }) = window_state_lock.saved_window
+                    }) = window_state_lock.saved_window.take()
                     {
                         window_state_lock.dpi_factor = dpi_factor;
-                            window_state_lock.saved_window = None;
+                        drop(window_state_lock);
 
-                            WindowState::refresh_window_state(
+                        unsafe {
-                                window_state_lock,
+                            winuser::SetWindowPos(
                                 window.0,
-                                Some(client_rect),
+                                ptr::null_mut(),
+                                client_rect.left,
+                                client_rect.top,
+                                client_rect.right - client_rect.left,
+                                client_rect.bottom - client_rect.top,
+                                winuser::SWP_ASYNCWINDOWPOS | winuser::SWP_NOZORDER,
                             );
+                            winuser::UpdateWindow(window.0);
+                        }
+                    }
+                }
             }
 
-                        mark_fullscreen(window.0, false);
+            unsafe {
+                taskbar_mark_fullscreen(window.0, fullscreen.is_some());
+            }
         });
     }
-            }
-        }
-    }
 
     #[inline]
     pub fn set_decorations(&self, decorations: bool) {
@@ -503,8 +600,7 @@ impl Window {
         let window_state = Arc::clone(&self.window_state);
 
         self.thread_executor.execute_in_thread(move || {
-            let client_rect = util::get_client_rect(window.0).expect("get client rect failed!");
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
-            WindowState::set_window_flags(window_state.lock(), window.0, Some(client_rect), |f| {
                 f.set(WindowFlags::DECORATIONS, decorations)
             });
         });
@@ -516,7 +612,7 @@ impl Window {
         let window_state = Arc::clone(&self.window_state);
 
         self.thread_executor.execute_in_thread(move || {
-            WindowState::set_window_flags(window_state.lock(), window.0, None, |f| {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
                 f.set(WindowFlags::ALWAYS_ON_TOP, always_on_top)
             });
         });
@@ -769,9 +865,7 @@ unsafe fn init<T: 'static>(
     let window_state = {
         let window_state = WindowState::new(&attributes, window_icon, taskbar_icon, dpi_factor);
         let window_state = Arc::new(Mutex::new(window_state));
-        WindowState::set_window_flags(window_state.lock(), real_window.0, None, |f| {
+        WindowState::set_window_flags(window_state.lock(), real_window.0, |f| *f = window_flags);
-            *f = window_flags
-        });
         window_state
     };
 
@@ -865,7 +959,7 @@ pub fn com_initialized() {
 // is activated. If the window is not fullscreen, the Shell falls back to
 // heuristics to determine how the window should be treated, which means
 // that it could still consider the window as fullscreen. :(
-unsafe fn mark_fullscreen(handle: HWND, fullscreen: bool) {
+unsafe fn taskbar_mark_fullscreen(handle: HWND, fullscreen: bool) {
     com_initialized();
 
     TASKBAR_LIST.with(|task_bar_list_ptr| {

src/platform_impl/windows/window_state.rs

@@ -1,8 +1,7 @@
 use crate::{
     dpi::LogicalSize,
-    monitor::MonitorHandle,
     platform_impl::platform::{event_loop, icon::WinIcon, util},
-    window::{CursorIcon, WindowAttributes},
+    window::{CursorIcon, Fullscreen, WindowAttributes},
 };
 use parking_lot::MutexGuard;
 use std::{io, ptr};
@@ -29,7 +28,7 @@ pub struct WindowState {
     pub saved_window: Option<SavedWindow>,
     pub dpi_factor: f64,
 
-    pub fullscreen: Option<MonitorHandle>,
+    pub fullscreen: Option<Fullscreen>,
     /// Used to supress duplicate redraw attempts when calling `request_redraw` multiple
     /// times in `EventsCleared`.
     pub queued_out_of_band_redraw: bool,
@@ -84,6 +83,7 @@ bitflags! {
             WindowFlags::RESIZABLE.bits |
             WindowFlags::MAXIMIZED.bits
         );
+        const FULLSCREEN_OR_MASK = WindowFlags::ALWAYS_ON_TOP.bits;
         const NO_DECORATIONS_AND_MASK = !WindowFlags::RESIZABLE.bits;
         const INVISIBLE_AND_MASK = !WindowFlags::MAXIMIZED.bits;
     }
@@ -122,32 +122,16 @@ impl WindowState {
         self.window_flags
     }
 
-    pub fn set_window_flags<F>(
+    pub fn set_window_flags<F>(mut this: MutexGuard<'_, Self>, window: HWND, f: F)
-        mut this: MutexGuard<'_, Self>,
+    where
-        window: HWND,
-        set_client_rect: Option<RECT>,
-        f: F,
-    ) where
         F: FnOnce(&mut WindowFlags),
     {
         let old_flags = this.window_flags;
         f(&mut this.window_flags);
-
-        let is_fullscreen = this.fullscreen.is_some();
-        this.window_flags
-            .set(WindowFlags::MARKER_FULLSCREEN, is_fullscreen);
         let new_flags = this.window_flags;
 
         drop(this);
-        old_flags.apply_diff(window, new_flags, set_client_rect);
+        old_flags.apply_diff(window, new_flags);
-    }
-
-    pub fn refresh_window_state(
-        this: MutexGuard<'_, Self>,
-        window: HWND,
-        set_client_rect: Option<RECT>,
-    ) {
-        Self::set_window_flags(this, window, set_client_rect, |_| ());
     }
 
     pub fn set_window_flags_in_place<F>(&mut self, f: F)
@@ -185,6 +169,7 @@ impl WindowFlags {
     fn mask(mut self) -> WindowFlags {
         if self.contains(WindowFlags::MARKER_FULLSCREEN) {
             self &= WindowFlags::FULLSCREEN_AND_MASK;
+            self |= WindowFlags::FULLSCREEN_OR_MASK;
         }
         if !self.contains(WindowFlags::VISIBLE) {
             self &= WindowFlags::INVISIBLE_AND_MASK;
@@ -236,7 +221,7 @@ impl WindowFlags {
     }
 
     /// Adjust the window client rectangle to the return value, if present.
-    fn apply_diff(mut self, window: HWND, mut new: WindowFlags, set_client_rect: Option<RECT>) {
+    fn apply_diff(mut self, window: HWND, mut new: WindowFlags) {
         self = self.mask();
         new = new.mask();
 
@@ -295,45 +280,20 @@ impl WindowFlags {
                 winuser::SetWindowLongW(window, winuser::GWL_STYLE, style as _);
                 winuser::SetWindowLongW(window, winuser::GWL_EXSTYLE, style_ex as _);
 
-                match set_client_rect
+                let mut flags = winuser::SWP_NOZORDER
-                    .and_then(|r| util::adjust_window_rect_with_styles(window, style, style_ex, r))
-                {
-                    Some(client_rect) => {
-                        let (x, y, w, h) = (
-                            client_rect.left,
-                            client_rect.top,
-                            client_rect.right - client_rect.left,
-                            client_rect.bottom - client_rect.top,
-                        );
-                        winuser::SetWindowPos(
-                            window,
-                            ptr::null_mut(),
-                            x,
-                            y,
-                            w,
-                            h,
-                            winuser::SWP_NOZORDER
-                                | winuser::SWP_FRAMECHANGED
-                                | winuser::SWP_NOACTIVATE,
-                        );
-                    }
-                    None => {
-                        // Refresh the window frame.
-                        winuser::SetWindowPos(
-                            window,
-                            ptr::null_mut(),
-                            0,
-                            0,
-                            0,
-                            0,
-                            winuser::SWP_NOZORDER
                     | winuser::SWP_NOMOVE
                     | winuser::SWP_NOSIZE
-                                | winuser::SWP_FRAMECHANGED
+                    | winuser::SWP_FRAMECHANGED;
-                                | winuser::SWP_NOACTIVATE,
+
-                        );
+                // We generally don't want style changes here to affect window
-                    }
+                // focus, but for fullscreen windows they must be activated
+                // (i.e. focused) so that they appear on top of the taskbar
+                if !new.contains(WindowFlags::MARKER_FULLSCREEN) {
+                    flags |= winuser::SWP_NOACTIVATE;
                 }
+
+                // Refresh the window frame
+                winuser::SetWindowPos(window, ptr::null_mut(), 0, 0, 0, 0, flags);
                 winuser::SendMessageW(window, *event_loop::SET_RETAIN_STATE_ON_SIZE_MSG_ID, 0, 0);
             }
         }

src/window.rs

@@ -5,7 +5,7 @@ use crate::{
     dpi::{LogicalPosition, LogicalSize},
     error::{ExternalError, NotSupportedError, OsError},
     event_loop::EventLoopWindowTarget,
-    monitor::{AvailableMonitorsIter, MonitorHandle},
+    monitor::{AvailableMonitorsIter, MonitorHandle, VideoMode},
     platform_impl,
 };
 
@@ -45,6 +45,18 @@ impl fmt::Debug for Window {
     }
 }
 
+impl Drop for Window {
+    fn drop(&mut self) {
+        // If the window is in exclusive fullscreen, we must restore the desktop
+        // video mode (generally this would be done on application exit, but
+        // closing the window doesn't necessarily always mean application exit,
+        // such as when there are multiple windows)
+        if let Some(Fullscreen::Exclusive(_)) = self.fullscreen() {
+            self.set_fullscreen(None);
+        }
+    }
+}
+
 /// Identifier of a window. Unique for each window.
 ///
 /// Can be obtained with `window.id()`.
@@ -110,7 +122,7 @@ pub struct WindowAttributes {
     /// Whether the window should be set as fullscreen upon creation.
     ///
     /// The default is `None`.
-    pub fullscreen: Option<MonitorHandle>,
+    pub fullscreen: Option<Fullscreen>,
 
     /// The title of the window in the title bar.
     ///
@@ -222,14 +234,14 @@ impl WindowBuilder {
         self
     }
 
-    /// Sets the window fullscreen state. None means a normal window, Some(MonitorHandle)
+    /// Sets the window fullscreen state. None means a normal window, Some(Fullscreen)
     /// means a fullscreen window on that specific monitor
     ///
     /// ## Platform-specific
     ///
     /// - **Windows:** Screen saver is disabled in fullscreen mode.
     #[inline]
-    pub fn with_fullscreen(mut self, monitor: Option<MonitorHandle>) -> WindowBuilder {
+    pub fn with_fullscreen(mut self, monitor: Option<Fullscreen>) -> WindowBuilder {
         self.window.fullscreen = monitor;
         self
     }
@@ -295,7 +307,6 @@ impl WindowBuilder {
         self,
         window_target: &EventLoopWindowTarget<T>,
     ) -> Result<Window, OsError> {
-        // building
         platform_impl::Window::new(&window_target.p, self.window, self.platform_specific)
             .map(|window| Window { window })
     }
@@ -537,11 +548,27 @@ impl Window {
     ///
     /// ## Platform-specific
     ///
+    /// - **macOS:** `Fullscreen::Exclusive` provides true exclusive mode with a
+    ///   video mode change. *Caveat!* macOS doesn't provide task switching (or
+    ///   spaces!) while in exclusive fullscreen mode. This mode should be used
+    ///   when a video mode change is desired, but for a better user experience,
+    ///   borderless fullscreen might be preferred.
+    ///
+    ///   `Fullscreen::Borderless` provides a borderless fullscreen window on a
+    ///   separate space. This is the idiomatic way for fullscreen games to work
+    ///   on macOS. See [`WindowExtMacOs::set_simple_fullscreen`][simple] if
+    ///   separate spaces are not preferred.
+    ///
+    ///   The dock and the menu bar are always disabled in fullscreen mode.
     /// - **iOS:** Can only be called on the main thread.
+    /// - **Wayland:** Does not support exclusive fullscreen mode.
     /// - **Windows:** Screen saver is disabled in fullscreen mode.
+    ///
+    /// [simple]:
+    /// ../platform/macos/trait.WindowExtMacOS.html#tymethod.set_simple_fullscreen
     #[inline]
-    pub fn set_fullscreen(&self, monitor: Option<MonitorHandle>) {
+    pub fn set_fullscreen(&self, fullscreen: Option<Fullscreen>) {
-        self.window.set_fullscreen(monitor)
+        self.window.set_fullscreen(fullscreen)
     }
 
     /// Gets the window's current fullscreen state.
@@ -550,7 +577,7 @@ impl Window {
     ///
     /// - **iOS:** Can only be called on the main thread.
     #[inline]
-    pub fn fullscreen(&self) -> Option<MonitorHandle> {
+    pub fn fullscreen(&self) -> Option<Fullscreen> {
         self.window.fullscreen()
     }
 
@@ -759,3 +786,9 @@ impl Default for CursorIcon {
         CursorIcon::Default
     }
 }
+
+#[derive(Clone, Debug, PartialEq)]
+pub enum Fullscreen {
+    Exclusive(VideoMode),
+    Borderless(MonitorHandle),
+}