anvil: reorganize platform-specific values

Cargo.toml

@@ -12,7 +12,7 @@ members = [ "anvil" ]
 
 [dependencies]
 bitflags = "1"
-calloop = {version = "0.8.0" }
+calloop = "0.8.0"
 cgmath = "0.18.0"
 dbus = { version = "0.9.0", optional = true }
 drm-fourcc = "^2.1.1"

anvil/src/input_handler.rs

@@ -1,9 +1,7 @@
 use std::{process::Command, sync::atomic::Ordering};
 
-use crate::AnvilState;
+use crate::{udev::UdevData, winit::WinitData, AnvilState};
 
-#[cfg(feature = "udev")]
-use smithay::backend::session::Session;
 use smithay::{
     backend::input::{
         self, Event, InputBackend, InputEvent, KeyState, KeyboardKeyEvent, PointerAxisEvent,
@@ -17,20 +15,7 @@ use smithay::{
 };
 
 impl<Backend> AnvilState<Backend> {
-    pub fn process_input_event<B: InputBackend>(&mut self, event: InputEvent<B>) {
+    fn keyboard_key_to_action<B: InputBackend>(&mut self, evt: B::KeyboardKeyEvent) -> KeyAction {
-        match event {
-            InputEvent::Keyboard { event, .. } => self.on_keyboard_key::<B>(event),
-            InputEvent::PointerMotion { event, .. } => self.on_pointer_move::<B>(event),
-            InputEvent::PointerMotionAbsolute { event, .. } => self.on_pointer_move_absolute::<B>(event),
-            InputEvent::PointerButton { event, .. } => self.on_pointer_button::<B>(event),
-            InputEvent::PointerAxis { event, .. } => self.on_pointer_axis::<B>(event),
-            _ => {
-                // other events are not handled in anvil (yet)
-            }
-        }
-    }
-
-    fn on_keyboard_key<B: InputBackend>(&mut self, evt: B::KeyboardKeyEvent) {
         let keycode = evt.key_code();
         let state = evt.state();
         debug!(self.log, "key"; "keycode" => keycode, "state" => format!("{:?}", state));
@@ -52,8 +37,10 @@ impl<Backend> AnvilState<Backend> {
             });
         if let KeyState::Released = state {
             // only process special actions on key press, not release
-            return;
+            return KeyAction::None;
         }
+        return action;
+        /*
         match action {
             KeyAction::Quit => {
                 info!(self.log, "Quitting.");
@@ -94,113 +81,7 @@ impl<Backend> AnvilState<Backend> {
             }
             _ => (),
         }
-    }
+        */
-
-    fn on_pointer_move<B: InputBackend>(&mut self, evt: B::PointerMotionEvent) {
-        let (x, y) = (evt.delta_x(), evt.delta_y());
-        let serial = SCOUNTER.next_serial();
-        let mut location = self.pointer_location.borrow_mut();
-        location.0 += x as f64;
-        location.1 += y as f64;
-
-        #[cfg(feature = "udev")]
-        {
-            // clamp to screen limits
-            // this event is never generated by winit
-            *location = self.clamp_coords(*location);
-        }
-
-        let under = self
-            .window_map
-            .borrow()
-            .get_surface_under((location.0, location.1));
-        self.pointer.motion(*location, under, serial, evt.time());
-    }
-
-    fn on_pointer_move_absolute<B: InputBackend>(&mut self, evt: B::PointerMotionAbsoluteEvent) {
-        // different cases depending on the context:
-        let (x, y) = {
-            #[cfg(feature = "udev")]
-            {
-                if self.session.is_some() {
-                    // we are started on a tty
-                    let x = self.pointer_location.borrow().0;
-                    let screen_size = self.current_output_size(x);
-                    // monitor coordinates
-                    let (ux, uy) = evt.position_transformed(screen_size);
-                    (ux + self.current_output_offset(x) as f64, uy as f64)
-                } else {
-                    // we are started in winit
-                    evt.position()
-                }
-            }
-            #[cfg(not(feature = "udev"))]
-            {
-                evt.position()
-            }
-        };
-        *self.pointer_location.borrow_mut() = (x, y);
-        let serial = SCOUNTER.next_serial();
-        let under = self.window_map.borrow().get_surface_under((x as f64, y as f64));
-        self.pointer.motion((x, y), under, serial, evt.time());
-    }
-
-    #[cfg(feature = "udev")]
-    fn clamp_coords(&self, pos: (f64, f64)) -> (f64, f64) {
-        let output_map = self.output_map.as_ref().unwrap();
-        let outputs = output_map.borrow();
-
-        if outputs.len() == 0 {
-            return pos;
-        }
-
-        let (mut x, mut y) = pos;
-        // max_x is the sum of the width of all outputs
-        let max_x = outputs.iter().fold(0u32, |acc, output| acc + output.size.0);
-        x = x.max(0.0).min(max_x as f64);
-
-        // max y depends on the current output
-        let max_y = self.current_output_size(x).1;
-        y = y.max(0.0).min(max_y as f64);
-
-        (x, y)
-    }
-
-    #[cfg(feature = "udev")]
-    fn current_output_idx(&self, x: f64) -> usize {
-        let output_map = self.output_map.as_ref().unwrap();
-        let outputs = output_map.borrow();
-
-        outputs
-            .iter()
-            // map each output to their x position
-            .scan(0u32, |acc, output| {
-                let curr_x = *acc;
-                *acc += output.size.0;
-                Some(curr_x)
-            })
-            // get an index
-            .enumerate()
-            // find the first one with a greater x
-            .find(|(_idx, x_pos)| *x_pos as f64 > x)
-            // the previous output is the one we are on
-            .map(|(idx, _)| idx - 1)
-            .unwrap_or(outputs.len() - 1)
-    }
-    #[cfg(feature = "udev")]
-    fn current_output_size(&self, x: f64) -> (u32, u32) {
-        let output_map = self.output_map.as_ref().unwrap();
-        let outputs = output_map.borrow();
-        outputs[self.current_output_idx(x)].size
-    }
-    #[cfg(feature = "udev")]
-    fn current_output_offset(&self, x: f64) -> u32 {
-        let output_map = self.output_map.as_ref().unwrap();
-        let outputs = output_map.borrow();
-        outputs
-            .iter()
-            .take(self.current_output_idx(x))
-            .fold(0u32, |acc, output| acc + output.size.0)
     }
 
     fn on_pointer_button<B: InputBackend>(&mut self, evt: B::PointerButtonEvent) {
@@ -267,7 +148,147 @@ impl<Backend> AnvilState<Backend> {
     }
 }
 
+#[cfg(feature = "winit")]
+impl AnvilState<WinitData> {
+    pub fn process_input_event<B: InputBackend>(&mut self, event: InputEvent<B>) {
+        match event {
+            InputEvent::Keyboard { event, .. } => match self.keyboard_key_to_action::<B>(event) {
+                KeyAction::None => {}
+                KeyAction::Quit => {
+                    info!(self.log, "Quitting.");
+                    self.running.store(false, Ordering::SeqCst);
+                }
+                KeyAction::Run(cmd) => {
+                    info!(self.log, "Starting program"; "cmd" => cmd.clone());
+                    if let Err(e) = Command::new(&cmd).spawn() {
+                        error!(self.log,
+                            "Failed to start program";
+                            "cmd" => cmd,
+                            "err" => format!("{:?}", e)
+                        );
+                    }
+                }
+                action => {
+                    warn!(self.log, "Key action {:?} unsupported on winit backend.", action);
+                }
+            },
+            InputEvent::PointerMotionAbsolute { event, .. } => self.on_pointer_move_absolute::<B>(event),
+            InputEvent::PointerButton { event, .. } => self.on_pointer_button::<B>(event),
+            InputEvent::PointerAxis { event, .. } => self.on_pointer_axis::<B>(event),
+            _ => {
+                // other events are not handled in anvil (yet)
+            }
+        }
+    }
+
+    fn on_pointer_move_absolute<B: InputBackend>(&mut self, evt: B::PointerMotionAbsoluteEvent) {
+        // different cases depending on the context:
+        let (x, y) = evt.position();
+        *self.pointer_location.borrow_mut() = (x, y);
+        let serial = SCOUNTER.next_serial();
+        let under = self.window_map.borrow().get_surface_under((x as f64, y as f64));
+        self.pointer.motion((x, y), under, serial, evt.time());
+    }
+}
+
+#[cfg(feature = "udev")]
+impl AnvilState<UdevData> {
+    pub fn process_input_event<B: InputBackend>(&mut self, event: InputEvent<B>) {
+        match event {
+            InputEvent::Keyboard { event, .. } => match self.keyboard_key_to_action::<B>(event) {
+                KeyAction::None => {}
+                KeyAction::Quit => {
+                    info!(self.log, "Quitting.");
+                    self.running.store(false, Ordering::SeqCst);
+                }
+                KeyAction::Run(cmd) => {
+                    info!(self.log, "Starting program"; "cmd" => cmd.clone());
+                    if let Err(e) = Command::new(&cmd).spawn() {
+                        error!(self.log,
+                            "Failed to start program";
+                            "cmd" => cmd,
+                            "err" => format!("{:?}", e)
+                        );
+                    }
+                }
+                action => {
+                    warn!(self.log, "Key action {:?} unsupported on winit backend.", action);
+                }
+            },
+            InputEvent::PointerMotion { event, .. } => self.on_pointer_move::<B>(event),
+            InputEvent::PointerButton { event, .. } => self.on_pointer_button::<B>(event),
+            InputEvent::PointerAxis { event, .. } => self.on_pointer_axis::<B>(event),
+            _ => {
+                // other events are not handled in anvil (yet)
+            }
+        }
+    }
+
+    fn on_pointer_move<B: InputBackend>(&mut self, evt: B::PointerMotionEvent) {
+        let (x, y) = (evt.delta_x(), evt.delta_y());
+        let serial = SCOUNTER.next_serial();
+        let mut location = self.pointer_location.borrow_mut();
+        location.0 += x as f64;
+        location.1 += y as f64;
+
+        // clamp to screen limits
+        // this event is never generated by winit
+        *location = self.clamp_coords(*location);
+
+        let under = self
+            .window_map
+            .borrow()
+            .get_surface_under((location.0, location.1));
+        self.pointer.motion(*location, under, serial, evt.time());
+    }
+
+    fn clamp_coords(&self, pos: (f64, f64)) -> (f64, f64) {
+        let outputs = self.backend_data.output_map.borrow();
+
+        if outputs.len() == 0 {
+            return pos;
+        }
+
+        let (mut x, mut y) = pos;
+        // max_x is the sum of the width of all outputs
+        let max_x = outputs.iter().fold(0u32, |acc, output| acc + output.size.0);
+        x = x.max(0.0).min(max_x as f64);
+
+        // max y depends on the current output
+        let max_y = self.current_output_size(x).1;
+        y = y.max(0.0).min(max_y as f64);
+
+        (x, y)
+    }
+
+    fn current_output_idx(&self, x: f64) -> usize {
+        let outputs = self.backend_data.output_map.borrow();
+
+        outputs
+            .iter()
+            // map each output to their x position
+            .scan(0u32, |acc, output| {
+                let curr_x = *acc;
+                *acc += output.size.0;
+                Some(curr_x)
+            })
+            // get an index
+            .enumerate()
+            // find the first one with a greater x
+            .find(|(_idx, x_pos)| *x_pos as f64 > x)
+            // the previous output is the one we are on
+            .map(|(idx, _)| idx - 1)
+            .unwrap_or(outputs.len() - 1)
+    }
+
+    fn current_output_size(&self, x: f64) -> (u32, u32) {
+        let outputs = self.backend_data.output_map.borrow();
+        outputs[self.current_output_idx(x)].size
+    }
+}
+
 /// Possible results of a keyboard action
+#[derive(Debug)]
 enum KeyAction {
     /// Quit the compositor
     Quit,

anvil/src/state.rs

@@ -9,7 +9,7 @@ use std::{
 
 use smithay::{
     reexports::{
-        calloop::{generic::Generic, Interest, LoopHandle, Mode, RegistrationToken},
+        calloop::{generic::Generic, Interest, LoopHandle, Mode},
         wayland_server::{protocol::wl_surface::WlSurface, Display},
     },
     wayland::{
@@ -22,23 +22,19 @@ use smithay::{
 
 #[cfg(feature = "egl")]
 use smithay::backend::egl::display::EGLBufferReader;
-#[cfg(feature = "udev")]
-use smithay::backend::session::{auto::AutoSession, Session};
 #[cfg(feature = "xwayland")]
 use smithay::xwayland::XWayland;
 
 use crate::shell::init_shell;
-#[cfg(feature = "udev")]
-use crate::udev::MyOutput;
 #[cfg(feature = "xwayland")]
 use crate::xwayland::XWm;
 
-pub struct AnvilState<Backend> {
+pub struct AnvilState<BackendData> {
-    pub backend: Backend,
+    pub backend_data: BackendData,
     pub socket_name: String,
     pub running: Arc<AtomicBool>,
     pub display: Rc<RefCell<Display>>,
-    pub handle: LoopHandle<'static, AnvilState<Backend>>,
+    pub handle: LoopHandle<'static, AnvilState<BackendData>>,
     pub ctoken: CompositorToken<crate::shell::Roles>,
     pub window_map: Rc<RefCell<crate::window_map::WindowMap<crate::shell::Roles>>>,
     pub dnd_icon: Arc<Mutex<Option<WlSurface>>>,
@@ -48,56 +44,48 @@ pub struct AnvilState<Backend> {
     pub keyboard: KeyboardHandle,
     pub pointer_location: Rc<RefCell<(f64, f64)>>,
     pub cursor_status: Arc<Mutex<CursorImageStatus>>,
-    #[cfg(feature = "udev")]
-    pub output_map: Option<Rc<RefCell<Vec<MyOutput>>>>,
     pub seat_name: String,
-    #[cfg(feature = "udev")]
+    #[cfg(feature = "egl")]
-    pub session: Option<AutoSession>,
+    pub egl_reader: Rc<RefCell<Option<EGLBufferReader>>>,
     // things we must keep alive
-    _wayland_event_source: RegistrationToken,
     #[cfg(feature = "xwayland")]
-    _xwayland: XWayland<XWm<Backend>>,
+    _xwayland: XWayland<XWm<BackendData>>,
 }
 
-impl<Backend: Default + 'static> AnvilState<Backend> {
+impl<BackendData: Backend + 'static> AnvilState<BackendData> {
     pub fn init(
         display: Rc<RefCell<Display>>,
-        handle: LoopHandle<'static, AnvilState<Backend>>,
+        handle: LoopHandle<'static, AnvilState<BackendData>>,
+        backend_data: BackendData,
         #[cfg(feature = "egl")] egl_reader: Rc<RefCell<Option<EGLBufferReader>>>,
-        #[cfg(feature = "udev")] session: Option<AutoSession>,
-        #[cfg(not(feature = "udev"))] _session: Option<()>,
-        #[cfg(feature = "udev")] output_map: Option<Rc<RefCell<Vec<MyOutput>>>>,
-        #[cfg(not(feature = "udev"))] _output_map: Option<()>,
         log: slog::Logger,
-    ) -> AnvilState<Backend> {
+    ) -> AnvilState<BackendData> {
         // init the wayland connection
-        let _wayland_event_source = handle
+        handle
             .insert_source(
                 Generic::from_fd(display.borrow().get_poll_fd(), Interest::READ, Mode::Level),
-                {
+                move |_, _, state: &mut AnvilState<BackendData>| {
-                    let display = display.clone();
+                    let display = state.display.clone();
-                    let log = log.clone();
-                    move |_, _, state: &mut AnvilState<Backend>| {
                     let mut display = display.borrow_mut();
                     match display.dispatch(std::time::Duration::from_millis(0), state) {
                         Ok(_) => Ok(()),
                         Err(e) => {
-                                error!(log, "I/O error on the Wayland display: {}", e);
+                            error!(state.log, "I/O error on the Wayland display: {}", e);
                             state.running.store(false, Ordering::SeqCst);
                             Err(e)
                         }
                     }
-                    }
                 },
             )
             .expect("Failed to init the wayland event source.");
 
         // Init the basic compositor globals
 
-        init_shm_global(&mut display.borrow_mut(), vec![], log.clone());
+        init_shm_global(&mut (*display).borrow_mut(), vec![], log.clone());
 
         #[cfg(feature = "egl")]
-        let shell_handles = init_shell::<Backend>(&mut display.borrow_mut(), egl_reader, log.clone());
+        let shell_handles =
+            init_shell::<BackendData>(&mut display.borrow_mut(), egl_reader.clone(), log.clone());
         #[cfg(not(feature = "egl"))]
         let shell_handles = init_shell(&mut display.borrow_mut(), log.clone());
 
@@ -132,14 +120,7 @@ impl<Backend: Default + 'static> AnvilState<Backend> {
         );
 
         // init input
-        #[cfg(feature = "udev")]
+        let seat_name = backend_data.seat_name();
-        let seat_name = if let Some(ref session) = session {
-            session.seat()
-        } else {
-            "anvil".into()
-        };
-        #[cfg(not(feature = "udev"))]
-        let seat_name: String = "anvil".into();
 
         let (mut seat, _) = Seat::new(
             &mut display.borrow_mut(),
@@ -174,7 +155,7 @@ impl<Backend: Default + 'static> AnvilState<Backend> {
         };
 
         AnvilState {
-            backend: Default::default(),
+            backend_data,
             running: Arc::new(AtomicBool::new(true)),
             display,
             handle,
@@ -187,14 +168,14 @@ impl<Backend: Default + 'static> AnvilState<Backend> {
             keyboard,
             cursor_status,
             pointer_location: Rc::new(RefCell::new((0.0, 0.0))),
-            #[cfg(feature = "udev")]
-            output_map,
             seat_name,
-            #[cfg(feature = "udev")]
+            egl_reader,
-            session,
-            _wayland_event_source,
             #[cfg(feature = "xwayland")]
             _xwayland,
         }
     }
 }
+
+pub trait Backend {
+    fn seat_name(&self) -> String;
+}

anvil/src/udev.rs

@@ -60,7 +60,7 @@ use smithay::{
 
 use crate::drawing::*;
 use crate::shell::{MyWindowMap, Roles};
-use crate::state::AnvilState;
+use crate::state::{AnvilState, Backend};
 
 #[derive(Clone)]
 pub struct SessionFd(RawFd);
@@ -70,11 +70,19 @@ impl AsRawFd for SessionFd {
     }
 }
 
-pub struct UdevData {}
+pub struct UdevData {
+    pub output_map: Rc<RefCell<Vec<MyOutput>>>,
+    pub session: AutoSession,
+    #[cfg(feature = "egl")]
+    primary_gpu: Option<PathBuf>,
+    backends: HashMap<dev_t, BackendData>,
+    signaler: Signaler<SessionSignal>,
+    pointer_image: ImageBuffer<Rgba<u8>, Vec<u8>>,
+}
 
-impl Default for UdevData {
+impl Backend for UdevData {
-    fn default() -> UdevData {
+    fn seat_name(&self) -> String {
-        UdevData {}
+        self.session.seat()
     }
 }
 
@@ -106,42 +114,30 @@ pub fn run_udev(
     /*
      * Initialize the compositor
      */
+    let pointer_bytes = include_bytes!("../resources/cursor2.rgba");
+    let primary_gpu = primary_gpu(&session.seat()).unwrap_or_default();
+    let data = UdevData {
+        session,
+        output_map: output_map.clone(),
+        primary_gpu,
+        backends: HashMap::new(),
+        signaler: session_signal.clone(),
+        pointer_image: ImageBuffer::from_raw(64, 64, pointer_bytes.to_vec()).unwrap(),
+    };
     let mut state = AnvilState::init(
         display.clone(),
         event_loop.handle(),
+        data,
         #[cfg(feature = "egl")]
         egl_buffer_reader.clone(),
-        Some(session),
-        Some(output_map.clone()),
         log.clone(),
     );
 
     /*
      * Initialize the udev backend
      */
-    let bytes = include_bytes!("../resources/cursor2.rgba");
     let udev_backend = UdevBackend::new(state.seat_name.clone(), log.clone()).map_err(|_| ())?;
 
-    let mut udev_handler = UdevHandlerImpl {
-        compositor_token: state.ctoken,
-        #[cfg(feature = "egl")]
-        egl_buffer_reader,
-        session: state.session.clone().unwrap(),
-        backends: HashMap::new(),
-        output_map,
-        display: display.clone(),
-        #[cfg(feature = "egl")]
-        primary_gpu: primary_gpu(&state.seat_name).unwrap_or_default(),
-        window_map: state.window_map.clone(),
-        pointer_location: state.pointer_location.clone(),
-        pointer_image: ImageBuffer::from_raw(64, 64, bytes.to_vec()).unwrap(),
-        cursor_status: state.cursor_status.clone(),
-        dnd_icon: state.dnd_icon.clone(),
-        loop_handle: event_loop.handle(),
-        signaler: session_signal.clone(),
-        logger: log.clone(),
-    };
-
     /*
      * Initialize a fake output (we render one screen to every device in this example)
      */
@@ -150,7 +146,7 @@ pub fn run_udev(
      * Initialize libinput backend
      */
     let mut libinput_context = Libinput::new_with_udev::<LibinputSessionInterface<AutoSession>>(
-        state.session.clone().unwrap().into(),
+        state.backend_data.session.clone().into(),
     );
     libinput_context.udev_assign_seat(&state.seat_name).unwrap();
     let mut libinput_backend = LibinputInputBackend::new(libinput_context, log.clone());
@@ -170,15 +166,15 @@ pub fn run_udev(
         .insert_source(notifier, |(), &mut (), _anvil_state| {})
         .unwrap();
     for (dev, path) in udev_backend.device_list() {
-        udev_handler.device_added(dev, path.into())
+        state.device_added(dev, path.into())
     }
 
     let udev_event_source = event_loop
         .handle()
-        .insert_source(udev_backend, move |event, _, _state| match event {
+        .insert_source(udev_backend, move |event, _, state| match event {
-            UdevEvent::Added { device_id, path } => udev_handler.device_added(device_id, path),
+            UdevEvent::Added { device_id, path } => state.device_added(device_id, path),
-            UdevEvent::Changed { device_id } => udev_handler.device_changed(device_id),
+            UdevEvent::Changed { device_id } => state.device_changed(device_id),
-            UdevEvent::Removed { device_id } => udev_handler.device_removed(device_id),
+            UdevEvent::Removed { device_id } => state.device_removed(device_id),
         })
         .map_err(|e| -> IoError { e.into() })
         .unwrap();
@@ -283,28 +279,7 @@ struct BackendData {
     event_dispatcher: Dispatcher<'static, DrmDevice<SessionFd>, AnvilState<UdevData>>,
 }
 
-struct UdevHandlerImpl {
+pub fn scan_connectors(
-    compositor_token: CompositorToken<Roles>,
-    #[cfg(feature = "egl")]
-    egl_buffer_reader: Rc<RefCell<Option<EGLBufferReader>>>,
-    session: AutoSession,
-    backends: HashMap<dev_t, BackendData>,
-    display: Rc<RefCell<Display>>,
-    #[cfg(feature = "egl")]
-    primary_gpu: Option<PathBuf>,
-    window_map: Rc<RefCell<MyWindowMap>>,
-    output_map: Rc<RefCell<Vec<MyOutput>>>,
-    pointer_location: Rc<RefCell<(f64, f64)>>,
-    pointer_image: ImageBuffer<Rgba<u8>, Vec<u8>>,
-    cursor_status: Arc<Mutex<CursorImageStatus>>,
-    dnd_icon: Arc<Mutex<Option<wl_surface::WlSurface>>>,
-    loop_handle: LoopHandle<'static, AnvilState<UdevData>>,
-    signaler: Signaler<SessionSignal>,
-    logger: ::slog::Logger,
-}
-
-impl UdevHandlerImpl {
-    pub fn scan_connectors(
     device: &mut DrmDevice<SessionFd>,
     gbm: &GbmDevice<SessionFd>,
     egl: &EGLDisplay,
@@ -313,7 +288,7 @@ impl UdevHandlerImpl {
     output_map: &mut Vec<MyOutput>,
     signaler: &Signaler<SessionSignal>,
     logger: &::slog::Logger,
-    ) -> HashMap<crtc::Handle, Rc<RefCell<RenderSurface>>> {
+) -> HashMap<crtc::Handle, Rc<RefCell<RenderSurface>>> {
     // Get a set of all modesetting resource handles (excluding planes):
     let res_handles = device.resource_handles().unwrap();
 
@@ -372,8 +347,8 @@ impl UdevHandlerImpl {
                         }
                     };
                     surface.link(signaler.clone());
-                        let renderer =
+                    let renderer = match DrmRenderSurface::new(surface, gbm.clone(), renderer, logger.clone())
-                            match DrmRenderSurface::new(surface, gbm.clone(), renderer, logger.clone()) {
+                    {
                         Ok(renderer) => renderer,
                         Err(err) => {
                             warn!(logger, "Failed to create rendering surface: {}", err);
@@ -397,13 +372,13 @@ impl UdevHandlerImpl {
     }
 
     backends
-    }
 }
 
-impl UdevHandlerImpl {
+impl AnvilState<UdevData> {
     fn device_added(&mut self, device_id: dev_t, path: PathBuf) {
         // Try to open the device
         if let Some((mut device, gbm)) = self
+            .backend_data
             .session
             .open(
                 &path,
@@ -414,14 +389,14 @@ impl UdevHandlerImpl {
                 match {
                     let fd = SessionFd(fd);
                     (
-                        DrmDevice::new(fd.clone(), true, self.logger.clone()),
+                        DrmDevice::new(fd.clone(), true, self.log.clone()),
                         GbmDevice::new(fd),
                     )
                 } {
                     (Ok(drm), Ok(gbm)) => Some((drm, gbm)),
                     (Err(err), _) => {
                         warn!(
-                            self.logger,
+                            self.log,
                             "Skipping device {:?}, because of drm error: {}", device_id, err
                         );
                         None
@@ -429,7 +404,7 @@ impl UdevHandlerImpl {
                     (_, Err(err)) => {
                         // TODO try DumbBuffer allocator in this case
                         warn!(
-                            self.logger,
+                            self.log,
                             "Skipping device {:?}, because of gbm error: {}", device_id, err
                         );
                         None
@@ -437,11 +412,11 @@ impl UdevHandlerImpl {
                 }
             })
         {
-            let egl = match EGLDisplay::new(&gbm, self.logger.clone()) {
+            let egl = match EGLDisplay::new(&gbm, self.log.clone()) {
                 Ok(display) => display,
                 Err(err) => {
                     warn!(
-                        self.logger,
+                        self.log,
                         "Skipping device {:?}, because of egl display error: {}", device_id, err
                     );
                     return;
@@ -449,48 +424,45 @@ impl UdevHandlerImpl {
             };
 
             #[cfg(feature = "egl")]
-            let is_primary = path.canonicalize().ok() == self.primary_gpu;
+            let is_primary = path.canonicalize().ok() == self.backend_data.primary_gpu;
             // init hardware acceleration on the primary gpu.
             #[cfg(feature = "egl")]
             {
                 if is_primary {
-                    info!(
+                    info!(self.log, "Initializing EGL Hardware Acceleration via {:?}", path);
-                        self.logger,
+                    *self.egl_reader.borrow_mut() = egl.bind_wl_display(&*self.display.borrow()).ok();
-                        "Initializing EGL Hardware Acceleration via {:?}", path
-                    );
-                    *self.egl_buffer_reader.borrow_mut() = egl.bind_wl_display(&*self.display.borrow()).ok();
                 }
             }
 
-            let context = match EGLContext::new(&egl, self.logger.clone()) {
+            let context = match EGLContext::new(&egl, self.log.clone()) {
                 Ok(context) => context,
                 Err(err) => {
                     warn!(
-                        self.logger,
+                        self.log,
                         "Skipping device {:?}, because of egl context error: {}", device_id, err
                     );
                     return;
                 }
             };
 
-            let backends = Rc::new(RefCell::new(UdevHandlerImpl::scan_connectors(
+            let backends = Rc::new(RefCell::new(scan_connectors(
                 &mut device,
                 &gbm,
                 &egl,
                 &context,
                 &mut *self.display.borrow_mut(),
-                &mut *self.output_map.borrow_mut(),
+                &mut *self.backend_data.output_map.borrow_mut(),
-                &self.signaler,
+                &self.backend_data.signaler,
-                &self.logger,
+                &self.log,
             )));
 
             // we leak this texture (we would need to call `destroy_texture` on Drop of DrmRenderer),
             // but only on shutdown anyway, because we do not support hot-pluggin, so it does not really matter.
             let pointer_image = {
-                let context = EGLContext::new_shared(&egl, &context, self.logger.clone()).unwrap();
+                let context = EGLContext::new_shared(&egl, &context, self.log.clone()).unwrap();
-                let mut renderer = unsafe { Gles2Renderer::new(context, self.logger.clone()).unwrap() };
+                let mut renderer = unsafe { Gles2Renderer::new(context, self.log.clone()).unwrap() };
                 renderer
-                    .import_bitmap(&self.pointer_image)
+                    .import_bitmap(&self.backend_data.pointer_image)
                     .expect("Failed to load pointer")
             };
 
@@ -501,35 +473,35 @@ impl UdevHandlerImpl {
                 device_id,
                 #[cfg(feature = "egl")]
                 egl_buffer_reader: if is_primary {
-                    self.egl_buffer_reader.borrow().clone()
+                    self.egl_reader.borrow().clone()
                 } else {
                     None
                 },
-                compositor_token: self.compositor_token,
+                compositor_token: self.ctoken,
                 backends: backends.clone(),
                 window_map: self.window_map.clone(),
-                output_map: self.output_map.clone(),
+                output_map: self.backend_data.output_map.clone(),
                 pointer_location: self.pointer_location.clone(),
                 pointer_image,
                 cursor_status: self.cursor_status.clone(),
                 dnd_icon: self.dnd_icon.clone(),
-                logger: self.logger.clone(),
+                logger: self.log.clone(),
                 start_time: std::time::Instant::now(),
             });
             let mut listener = DrmRendererSessionListener {
                 renderer: renderer.clone(),
-                loop_handle: self.loop_handle.clone(),
+                loop_handle: self.handle.clone(),
             };
-            let restart_token = self.signaler.register(move |signal| match signal {
+            let restart_token = self.backend_data.signaler.register(move |signal| match signal {
                 SessionSignal::ActivateSession | SessionSignal::ActivateDevice { .. } => listener.activate(),
                 _ => {}
             });
             let mut drm_handler = DrmHandlerImpl {
                 renderer,
-                loop_handle: self.loop_handle.clone(),
+                loop_handle: self.handle.clone(),
             };
 
-            device.link(self.signaler.clone());
+            device.link(self.backend_data.signaler.clone());
             let dev_id = device.device_id();
             let event_dispatcher = Dispatcher::new(device, move |event, _, _| match event {
                 DrmEvent::VBlank(crtc) => drm_handler.vblank(crtc),
@@ -537,19 +509,16 @@ impl UdevHandlerImpl {
                     error!(drm_handler.renderer.logger, "{:?}", error);
                 }
             });
-            let registration_token = self
+            let registration_token = self.handle.register_dispatcher(event_dispatcher.clone()).unwrap();
-                .loop_handle
-                .register_dispatcher(event_dispatcher.clone())
-                .unwrap();
 
-            trace!(self.logger, "Backends: {:?}", backends.borrow().keys());
+            trace!(self.log, "Backends: {:?}", backends.borrow().keys());
             for backend in backends.borrow_mut().values() {
                 // render first frame
-                trace!(self.logger, "Scheduling frame");
+                trace!(self.log, "Scheduling frame");
-                schedule_initial_render(backend.clone(), &self.loop_handle, self.logger.clone());
+                schedule_initial_render(backend.clone(), &self.handle, self.log.clone());
             }
 
-            self.backends.insert(
+            self.backend_data.backends.insert(
                 dev_id,
                 BackendData {
                     _restart_token: restart_token,
@@ -566,17 +535,17 @@ impl UdevHandlerImpl {
 
     fn device_changed(&mut self, device: dev_t) {
         //quick and dirty, just re-init all backends
-        if let Some(ref mut backend_data) = self.backends.get_mut(&device) {
+        if let Some(ref mut backend_data) = self.backend_data.backends.get_mut(&device) {
-            let logger = self.logger.clone();
+            let logger = self.log.clone();
-            let loop_handle = self.loop_handle.clone();
+            let loop_handle = self.handle.clone();
             let mut display = self.display.borrow_mut();
-            let mut output_map = self.output_map.borrow_mut();
+            let mut output_map = self.backend_data.output_map.borrow_mut();
-            let signaler = self.signaler.clone();
+            let signaler = self.backend_data.signaler.clone();
             output_map.retain(|output| output.device_id != device);
 
             let mut source = backend_data.event_dispatcher.as_source_mut();
             let mut backends = backend_data.surfaces.borrow_mut();
-            *backends = UdevHandlerImpl::scan_connectors(
+            *backends = scan_connectors(
                 &mut *source,
                 &backend_data.gbm,
                 &backend_data.egl,
@@ -597,26 +566,29 @@ impl UdevHandlerImpl {
 
     fn device_removed(&mut self, device: dev_t) {
         // drop the backends on this side
-        if let Some(backend_data) = self.backends.remove(&device) {
+        if let Some(backend_data) = self.backend_data.backends.remove(&device) {
             // drop surfaces
             backend_data.surfaces.borrow_mut().clear();
-            debug!(self.logger, "Surfaces dropped");
+            debug!(self.log, "Surfaces dropped");
             // clear outputs
-            self.output_map
+            self.backend_data
+                .output_map
                 .borrow_mut()
                 .retain(|output| output.device_id != device);
 
-            let _device = self.loop_handle.remove(backend_data.registration_token);
+            let _device = self.handle.remove(backend_data.registration_token);
             let _device = backend_data.event_dispatcher.into_source_inner();
 
             // don't use hardware acceleration anymore, if this was the primary gpu
             #[cfg(feature = "egl")]
             {
-                if _device.dev_path().and_then(|path| path.canonicalize().ok()) == self.primary_gpu {
+                if _device.dev_path().and_then(|path| path.canonicalize().ok())
-                    *self.egl_buffer_reader.borrow_mut() = None;
+                    == self.backend_data.primary_gpu
+                {
+                    *self.egl_reader.borrow_mut() = None;
                 }
             }
-            debug!(self.logger, "Dropping device");
+            debug!(self.log, "Dropping device");
         }
     }
 }

anvil/src/winit.rs

@@ -15,13 +15,13 @@ use smithay::{
 use slog::Logger;
 
 use crate::drawing::*;
-use crate::state::AnvilState;
+use crate::state::{AnvilState, Backend};
 
 pub struct WinitData;
 
-impl Default for WinitData {
+impl Backend for WinitData {
-    fn default() -> WinitData {
+    fn seat_name(&self) -> String {
-        WinitData
+        String::from("winit")
     }
 }
 
@@ -54,10 +54,9 @@ pub fn run_winit(
     let mut state = AnvilState::init(
         display.clone(),
         event_loop.handle(),
+        WinitData,
         #[cfg(feature = "egl")]
         Rc::new(RefCell::new(reader.clone())),
-        None,
-        None,
         log.clone(),
     );