Main structure of WLCS integration.

Cargo.toml

@@ -8,7 +8,7 @@ repository = "https://github.com/Smithay/smithay"
 edition = "2018"
 
 [workspace]
-members = [ "anvil" ]
+members = [ "anvil", "wlcs_anvil" ]
 
 [dependencies]
 appendlist = "1.4"

anvil/src/state.rs

@@ -29,7 +29,7 @@ use crate::shell::init_shell;
 
 pub struct AnvilState<BackendData> {
     pub backend_data: BackendData,
-    pub socket_name: String,
+    pub socket_name: Option<String>,
     pub running: Arc<AtomicBool>,
     pub display: Rc<RefCell<Display>>,
     pub handle: LoopHandle<'static, AnvilState<BackendData>>,
@@ -57,6 +57,7 @@ impl<BackendData: Backend + 'static> AnvilState<BackendData> {
         handle: LoopHandle<'static, AnvilState<BackendData>>,
         backend_data: BackendData,
         log: slog::Logger,
+        listen_on_socket: bool,
     ) -> AnvilState<BackendData> {
         // init the wayland connection
         handle
@@ -85,6 +86,7 @@ impl<BackendData: Backend + 'static> AnvilState<BackendData> {
 
         init_xdg_output_manager(&mut display.borrow_mut(), log.clone());
 
+        let socket_name = if listen_on_socket {
             let socket_name = display
                 .borrow_mut()
                 .add_socket_auto()
@@ -93,6 +95,10 @@ impl<BackendData: Backend + 'static> AnvilState<BackendData> {
                 .unwrap();
             info!(log, "Listening on wayland socket"; "name" => socket_name.clone());
             ::std::env::set_var("WAYLAND_DISPLAY", &socket_name);
+            Some(socket_name)
+        } else {
+            None
+        };
 
         // init data device
 

anvil/src/udev.rs

@@ -142,7 +142,7 @@ pub fn run_udev(log: Logger) {
         pointer_image: crate::cursor::Cursor::load(&log),
         render_timer: timer.handle(),
     };
-    let mut state = AnvilState::init(display.clone(), event_loop.handle(), data, log.clone());
+    let mut state = AnvilState::init(display.clone(), event_loop.handle(), data, log.clone(), true);
 
     // re-render timer
     event_loop

anvil/src/winit.rs

@@ -94,7 +94,7 @@ pub fn run_winit(log: Logger) {
         #[cfg(feature = "debug")]
         fps: fps_ticker::Fps::default(),
     };
-    let mut state = AnvilState::init(display.clone(), event_loop.handle(), data, log.clone());
+    let mut state = AnvilState::init(display.clone(), event_loop.handle(), data, log.clone(), true);
 
     let mode = Mode {
         size,

wlcs_anvil/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "wlcs_anvil"
+version = "0.0.1"
+authors = ["Victor Berger <victor.berger@m4x.org>", "Drakulix (Victor Brekenfeld)"]
+license = "MIT"
+publish = false
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+smithay = { path = "..", default-features=false, features=["wayland_frontend"] }
+anvil = { path = "../anvil", default-features=false }
+wayland-sys = { version = "0.28.6", features=["client"] }
+libc = "0.2"
+memoffset = "0.6"
+slog = "2.0"
+cgmath = "0.18"
+nix = "0.20"

wlcs_anvil/src/ffi_api.rs

@@ -0,0 +1,71 @@
+use std::os::raw::{c_char, c_int};
+
+use smithay::reexports::wayland_server::sys::server as ssys;
+use wayland_sys::{client::*, common::wl_fixed_t};
+
+#[repr(C)]
+pub struct WlcsExtensionDescriptor {
+    pub name: *const c_char,
+    pub version: u32,
+}
+
+unsafe impl Sync for WlcsExtensionDescriptor {}
+unsafe impl Send for WlcsExtensionDescriptor {}
+
+#[repr(C)]
+pub struct WlcsIntegrationDescriptor {
+    pub version: u32,
+    pub num_extensions: usize,
+    pub supported_extensions: *const WlcsExtensionDescriptor,
+}
+
+unsafe impl Sync for WlcsIntegrationDescriptor {}
+unsafe impl Send for WlcsIntegrationDescriptor {}
+
+#[repr(C)]
+pub struct WlcsDisplayServer {
+    pub version: u32,
+    pub start: unsafe extern "C" fn(*mut WlcsDisplayServer),
+    pub stop: unsafe extern "C" fn(*mut WlcsDisplayServer),
+    pub create_client_socket: unsafe extern "C" fn(*mut WlcsDisplayServer) -> c_int,
+    pub position_window_absolute:
+        unsafe extern "C" fn(*mut WlcsDisplayServer, *mut wl_display, *mut wl_proxy, c_int, c_int),
+    pub create_pointer: unsafe extern "C" fn(*mut WlcsDisplayServer) -> *mut WlcsPointer,
+    pub create_touch: unsafe extern "C" fn(*mut WlcsDisplayServer) -> *mut WlcsTouch,
+    pub get_descriptor: unsafe extern "C" fn(*const WlcsDisplayServer) -> *const WlcsIntegrationDescriptor,
+    pub start_on_this_thread: Option<unsafe extern "C" fn(*mut WlcsDisplayServer, *mut ssys::wl_event_loop)>,
+}
+
+#[repr(C)]
+pub struct WlcsServerIntegration {
+    pub version: u32,
+    pub create_server: unsafe extern "C" fn(c_int, *mut *const c_char) -> *mut WlcsDisplayServer,
+    pub destroy_server: unsafe extern "C" fn(*mut WlcsDisplayServer),
+}
+
+/*
+ * WlcsPointer
+ */
+
+#[repr(C)]
+pub struct WlcsPointer {
+    pub version: u32,
+    pub move_absolute: unsafe extern "C" fn(*mut WlcsPointer, wl_fixed_t, wl_fixed_t),
+    pub move_relative: unsafe extern "C" fn(*mut WlcsPointer, wl_fixed_t, wl_fixed_t),
+    pub button_up: unsafe extern "C" fn(*mut WlcsPointer, c_int),
+    pub button_down: unsafe extern "C" fn(*mut WlcsPointer, c_int),
+    pub destroy: unsafe extern "C" fn(*mut WlcsPointer),
+}
+
+/*
+ * WlcsTouch
+ */
+
+#[repr(C)]
+pub struct WlcsTouch {
+    pub version: u32,
+    pub touch_down: unsafe extern "C" fn(*mut WlcsTouch, wl_fixed_t, wl_fixed_t),
+    pub touch_move: unsafe extern "C" fn(*mut WlcsTouch, wl_fixed_t, wl_fixed_t),
+    pub touch_up: unsafe extern "C" fn(*mut WlcsTouch),
+    pub destroy: unsafe extern "C" fn(*mut WlcsTouch),
+}

wlcs_anvil/src/ffi_wrappers.rs

@@ -0,0 +1,261 @@
+use std::{
+    os::{
+        raw::{c_char, c_int},
+        unix::{
+            net::UnixStream,
+            prelude::{AsRawFd, IntoRawFd},
+        },
+    },
+    thread::JoinHandle,
+};
+
+use smithay::reexports::calloop::channel::{channel, Sender};
+use wayland_sys::{
+    client::*,
+    common::{wl_fixed_t, wl_fixed_to_double},
+    ffi_dispatch,
+};
+
+use crate::{ffi_api::*, WlcsEvent};
+
+macro_rules! container_of(
+    ($ptr: expr, $container: ident, $field: ident) => {
+        ($ptr as *mut u8).offset(-(memoffset::offset_of!($container, $field) as isize)) as *mut $container
+    }
+);
+
+#[no_mangle]
+pub static wlcs_server_integration: WlcsServerIntegration = WlcsServerIntegration {
+    version: 1,
+    create_server,
+    destroy_server,
+};
+
+unsafe extern "C" fn create_server(_argc: c_int, _argv: *mut *const c_char) -> *mut WlcsDisplayServer {
+    // block the SIGPIPE signal here, we are a cdylib so Rust does not do it for us
+    use nix::sys::signal::{sigaction, SaFlags, SigAction, SigHandler, SigSet, Signal};
+    sigaction(
+        Signal::SIGPIPE,
+        &SigAction::new(SigHandler::SigIgn, SaFlags::empty(), SigSet::empty()),
+    )
+    .unwrap();
+    let handle = Box::into_raw(Box::new(DisplayServerHandle::new()));
+    &mut (*handle).wlcs_display_server
+}
+
+unsafe extern "C" fn destroy_server(ptr: *mut WlcsDisplayServer) {
+    let _server = Box::from_raw(container_of!(ptr, DisplayServerHandle, wlcs_display_server));
+}
+
+struct DisplayServerHandle {
+    wlcs_display_server: WlcsDisplayServer,
+    server: Option<(Sender<WlcsEvent>, JoinHandle<()>)>,
+    next_device_id: u32,
+}
+
+impl DisplayServerHandle {
+    fn new() -> DisplayServerHandle {
+        DisplayServerHandle {
+            wlcs_display_server: WlcsDisplayServer {
+                version: 3,
+                start: Self::start,
+                stop: Self::stop,
+                create_client_socket: Self::create_client_socket,
+                position_window_absolute: Self::position_window_absolute,
+                create_pointer: Self::create_pointer,
+                create_touch: Self::create_touch,
+                get_descriptor: Self::get_descriptor,
+                start_on_this_thread: None,
+            },
+            server: None,
+            next_device_id: 1,
+        }
+    }
+
+    unsafe extern "C" fn start(ptr: *mut WlcsDisplayServer) {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        let (tx, rx) = channel();
+        let join = crate::start_anvil(rx);
+        me.server = Some((tx, join));
+    }
+
+    unsafe extern "C" fn stop(ptr: *mut WlcsDisplayServer) {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        if let Some((sender, join)) = me.server.take() {
+            let _ = sender.send(WlcsEvent::Exit);
+            let _ = join.join();
+        }
+    }
+
+    unsafe extern "C" fn create_client_socket(ptr: *mut WlcsDisplayServer) -> c_int {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        if let Some((ref sender, _)) = me.server {
+            if let Ok((client_side, server_side)) = UnixStream::pair() {
+                if sender
+                    .send(WlcsEvent::NewClient {
+                        stream: server_side,
+                        client_id: client_side.as_raw_fd(),
+                    })
+                    .is_err()
+                {
+                    return -1;
+                }
+                return client_side.into_raw_fd();
+            }
+        }
+        -1
+    }
+
+    unsafe extern "C" fn position_window_absolute(
+        ptr: *mut WlcsDisplayServer,
+        display: *mut wl_display,
+        surface: *mut wl_proxy,
+        x: c_int,
+        y: c_int,
+    ) {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        let client_id = ffi_dispatch!(WAYLAND_CLIENT_HANDLE, wl_display_get_fd, display);
+        let surface_id = ffi_dispatch!(WAYLAND_CLIENT_HANDLE, wl_proxy_get_id, surface);
+        if let Some((ref sender, _)) = me.server {
+            let _ = sender.send(WlcsEvent::PositionWindow {
+                client_id,
+                surface_id,
+                location: (x, y),
+            });
+        }
+    }
+
+    unsafe extern "C" fn create_pointer(ptr: *mut WlcsDisplayServer) -> *mut WlcsPointer {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        if let Some((ref sender, _)) = me.server {
+            let pointer = Box::into_raw(Box::new(PointerHandle::new(me.next_device_id, sender.clone())));
+            me.next_device_id += 1;
+            &mut (*pointer).wlcs_pointer
+        } else {
+            std::ptr::null_mut()
+        }
+    }
+
+    unsafe extern "C" fn create_touch(ptr: *mut WlcsDisplayServer) -> *mut WlcsTouch {
+        let me = &mut *container_of!(ptr, DisplayServerHandle, wlcs_display_server);
+        if let Some((ref sender, _)) = me.server {
+            let pointer = Box::into_raw(Box::new(TouchHandle::new(me.next_device_id, sender.clone())));
+            me.next_device_id += 1;
+            &mut (*pointer).wlcs_touch
+        } else {
+            std::ptr::null_mut()
+        }
+    }
+
+    unsafe extern "C" fn get_descriptor(_: *const WlcsDisplayServer) -> *const WlcsIntegrationDescriptor {
+        &crate::DESCRIPTOR
+    }
+}
+
+struct PointerHandle {
+    wlcs_pointer: WlcsPointer,
+    device_id: u32,
+    sender: Sender<WlcsEvent>,
+}
+
+impl PointerHandle {
+    fn new(device_id: u32, sender: Sender<WlcsEvent>) -> PointerHandle {
+        PointerHandle {
+            wlcs_pointer: WlcsPointer {
+                version: 1,
+                move_absolute: Self::move_absolute,
+                move_relative: Self::move_relative,
+                button_down: Self::button_down,
+                button_up: Self::button_up,
+                destroy: Self::destroy,
+            },
+            device_id,
+            sender,
+        }
+    }
+
+    unsafe extern "C" fn move_absolute(ptr: *mut WlcsPointer, x: wl_fixed_t, y: wl_fixed_t) {
+        let me = &mut *container_of!(ptr, PointerHandle, wlcs_pointer);
+        let _ = me.sender.send(WlcsEvent::PointerMoveAbsolute {
+            device_id: me.device_id,
+            location: (wl_fixed_to_double(x), wl_fixed_to_double(y)),
+        });
+    }
+
+    unsafe extern "C" fn move_relative(ptr: *mut WlcsPointer, x: wl_fixed_t, y: wl_fixed_t) {
+        let me = &mut *container_of!(ptr, PointerHandle, wlcs_pointer);
+        let _ = me.sender.send(WlcsEvent::PointerMoveRelative {
+            device_id: me.device_id,
+            delta: (wl_fixed_to_double(x), wl_fixed_to_double(y)),
+        });
+    }
+
+    unsafe extern "C" fn button_up(ptr: *mut WlcsPointer, button_id: i32) {
+        let me = &mut *container_of!(ptr, PointerHandle, wlcs_pointer);
+        let _ = me.sender.send(WlcsEvent::PointerButtonUp {
+            device_id: me.device_id,
+            button_id,
+        });
+    }
+
+    unsafe extern "C" fn button_down(ptr: *mut WlcsPointer, button_id: i32) {
+        let me = &mut *container_of!(ptr, PointerHandle, wlcs_pointer);
+        let _ = me.sender.send(WlcsEvent::PointerButtonDown {
+            device_id: me.device_id,
+            button_id,
+        });
+    }
+
+    unsafe extern "C" fn destroy(ptr: *mut WlcsPointer) {
+        let _me = Box::from_raw(container_of!(ptr, PointerHandle, wlcs_pointer));
+    }
+}
+
+struct TouchHandle {
+    wlcs_touch: WlcsTouch,
+    device_id: u32,
+    sender: Sender<WlcsEvent>,
+}
+
+impl TouchHandle {
+    fn new(device_id: u32, sender: Sender<WlcsEvent>) -> TouchHandle {
+        TouchHandle {
+            wlcs_touch: WlcsTouch {
+                version: 1,
+                touch_down: Self::touch_down,
+                touch_move: Self::touch_move,
+                touch_up: Self::touch_up,
+                destroy: Self::destroy,
+            },
+            device_id,
+            sender,
+        }
+    }
+
+    unsafe extern "C" fn touch_down(ptr: *mut WlcsTouch, x: wl_fixed_t, y: wl_fixed_t) {
+        let me = &mut *container_of!(ptr, TouchHandle, wlcs_touch);
+        let _ = me.sender.send(WlcsEvent::TouchDown {
+            device_id: me.device_id,
+            location: (wl_fixed_to_double(x), wl_fixed_to_double(y)),
+        });
+    }
+
+    unsafe extern "C" fn touch_move(ptr: *mut WlcsTouch, x: wl_fixed_t, y: wl_fixed_t) {
+        let me = &mut *container_of!(ptr, TouchHandle, wlcs_touch);
+        let _ = me.sender.send(WlcsEvent::TouchMove {
+            device_id: me.device_id,
+            location: (wl_fixed_to_double(x), wl_fixed_to_double(y)),
+        });
+    }
+
+    unsafe extern "C" fn touch_up(ptr: *mut WlcsTouch) {
+        let me = &mut *container_of!(ptr, TouchHandle, wlcs_touch);
+        let _ = me.sender.send(WlcsEvent::TouchUp {
+            device_id: me.device_id,
+        });
+    }
+
+    unsafe extern "C" fn destroy(ptr: *mut WlcsTouch) {
+        let _me = Box::from_raw(container_of!(ptr, TouchHandle, wlcs_touch));
+    }
+}

wlcs_anvil/src/lib.rs

@@ -0,0 +1,110 @@
+mod ffi_api;
+mod ffi_wrappers;
+mod main_loop;
+mod renderer;
+
+use std::{os::unix::net::UnixStream, thread::JoinHandle};
+
+use smithay::reexports::calloop;
+
+use ffi_api::{WlcsExtensionDescriptor, WlcsIntegrationDescriptor};
+
+macro_rules! extension_list {
+    ($(($name: expr, $version: expr)),* $(,)?) => {
+        &[$(
+            WlcsExtensionDescriptor {
+                name: concat!($name, "\0").as_ptr() as *const std::os::raw::c_char,
+                version: $version
+            }
+        ),*]
+    };
+}
+
+static SUPPORTED_EXTENSIONS: &[WlcsExtensionDescriptor] = extension_list!(
+    ("wl_compositor", 4),
+    ("wl_subcompositor", 1),
+    ("wl_data_device_manager", 3),
+    ("wl_shell", 1),
+    ("wl_seat", 5),
+    ("wl_output", 3),
+    ("xdg_wm_base", 1),
+);
+
+static DESCRIPTOR: WlcsIntegrationDescriptor = WlcsIntegrationDescriptor {
+    version: 1,
+    num_extensions: SUPPORTED_EXTENSIONS.len(),
+    supported_extensions: SUPPORTED_EXTENSIONS.as_ptr(),
+};
+
+/// Event sent by WLCS to control the compositor
+#[derive(Debug)]
+pub enum WlcsEvent {
+    /// Stop the running server
+    Exit,
+    /// Create a new client from given RawFd
+    NewClient {
+        stream: UnixStream,
+        client_id: i32,
+    },
+    /// Position this window from the client associated with this Fd on the global space
+    PositionWindow {
+        client_id: i32,
+        surface_id: u32,
+        location: (i32, i32),
+    },
+    /* Pointer related events */
+    /// A new pointer device is available
+    NewPointer {
+        device_id: u32,
+    },
+    /// Move the pointer in absolute coordinate space
+    PointerMoveAbsolute {
+        device_id: u32,
+        location: (f64, f64),
+    },
+    /// Move the pointer in relative coordinate space
+    PointerMoveRelative {
+        device_id: u32,
+        delta: (f64, f64),
+    },
+    /// Press a pointer button
+    PointerButtonDown {
+        device_id: u32,
+        button_id: i32,
+    },
+    /// Release a pointer button
+    PointerButtonUp {
+        device_id: u32,
+        button_id: i32,
+    },
+    /// A pointer device is removed
+    PointerRemoved {
+        device_id: u32,
+    },
+    /* Touch related events */
+    /// A new touch device is available
+    NewTouch {
+        device_id: u32,
+    },
+    /// A touch point is down
+    TouchDown {
+        device_id: u32,
+        location: (f64, f64),
+    },
+    /// A touch point moved
+    TouchMove {
+        device_id: u32,
+        location: (f64, f64),
+    },
+    /// A touch point is up
+    TouchUp {
+        device_id: u32,
+    },
+    TouchRemoved {
+        device_id: u32,
+    },
+}
+
+fn start_anvil(channel: calloop::channel::Channel<WlcsEvent>) -> JoinHandle<()> {
+    std::thread::spawn(move || main_loop::run(channel))
+}

wlcs_anvil/src/main_loop.rs

@@ -0,0 +1,195 @@
+use std::{
+    cell::RefCell, collections::HashMap, os::unix::prelude::IntoRawFd, rc::Rc, sync::atomic::Ordering,
+    time::Duration,
+};
+
+use smithay::{
+    backend::{
+        renderer::{Frame, Renderer, Transform},
+        SwapBuffersError,
+    },
+    reexports::{
+        calloop::{
+            channel::{Channel, Event as ChannelEvent},
+            EventLoop,
+        },
+        wayland_server::{protocol::wl_output, Client, Display},
+    },
+    wayland::{
+        output::{Mode, PhysicalProperties},
+        seat::CursorImageStatus,
+    },
+};
+
+use anvil::{
+    drawing::{draw_cursor, draw_dnd_icon, draw_windows},
+    state::Backend,
+    AnvilState,
+};
+
+use crate::WlcsEvent;
+
+pub const OUTPUT_NAME: &str = "anvil";
+
+struct TestState {
+    clients: HashMap<i32, Client>,
+}
+
+impl Backend for TestState {
+    fn seat_name(&self) -> String {
+        "anvil_wlcs".into()
+    }
+}
+
+pub fn run(channel: Channel<WlcsEvent>) {
+    let mut event_loop =
+        EventLoop::<AnvilState<TestState>>::try_new().expect("Failed to init the event loop.");
+
+    let display = Rc::new(RefCell::new(Display::new()));
+
+    let logger = slog::Logger::root(slog::Discard, slog::o!());
+
+    let test_state = TestState {
+        clients: HashMap::new(),
+    };
+
+    let mut state = AnvilState::init(
+        display.clone(),
+        event_loop.handle(),
+        test_state,
+        logger.clone(),
+        false,
+    );
+
+    event_loop
+        .handle()
+        .insert_source(channel, move |event, &mut (), state| match event {
+            ChannelEvent::Msg(evt) => handle_event(evt, state),
+            ChannelEvent::Closed => handle_event(WlcsEvent::Exit, state),
+        })
+        .unwrap();
+
+    let mut renderer = crate::renderer::DummyRenderer::new();
+
+    let mode = Mode {
+        size: (800, 600).into(),
+        refresh: 60_000,
+    };
+
+    state.output_map.borrow_mut().add(
+        OUTPUT_NAME,
+        PhysicalProperties {
+            size: (0, 0).into(),
+            subpixel: wl_output::Subpixel::Unknown,
+            make: "Smithay".into(),
+            model: "Winit".into(),
+        },
+        mode,
+    );
+
+    while state.running.load(Ordering::SeqCst) {
+        // pretend to draw something
+        {
+            let output_geometry = state
+                .output_map
+                .borrow()
+                .find_by_name(OUTPUT_NAME)
+                .unwrap()
+                .geometry();
+
+            renderer
+                .render((800, 600).into(), Transform::Normal, |renderer, frame| {
+                    frame.clear([0.8, 0.8, 0.9, 1.0])?;
+
+                    // draw the windows
+                    draw_windows(
+                        renderer,
+                        frame,
+                        &*state.window_map.borrow(),
+                        output_geometry,
+                        1.0,
+                        &logger,
+                    )?;
+
+                    // draw the dnd icon if any
+                    {
+                        let guard = state.dnd_icon.lock().unwrap();
+                        if let Some(ref surface) = *guard {
+                            if surface.as_ref().is_alive() {
+                                draw_dnd_icon(
+                                    renderer,
+                                    frame,
+                                    surface,
+                                    state.pointer_location.to_i32_floor(),
+                                    1.0,
+                                    &logger,
+                                )?;
+                            }
+                        }
+                    }
+                    // draw the cursor as relevant
+                    {
+                        let mut guard = state.cursor_status.lock().unwrap();
+                        // reset the cursor if the surface is no longer alive
+                        let mut reset = false;
+                        if let CursorImageStatus::Image(ref surface) = *guard {
+                            reset = !surface.as_ref().is_alive();
+                        }
+                        if reset {
+                            *guard = CursorImageStatus::Default;
+                        }
+
+                        // draw as relevant
+                        if let CursorImageStatus::Image(ref surface) = *guard {
+                            draw_cursor(
+                                renderer,
+                                frame,
+                                surface,
+                                state.pointer_location.to_i32_floor(),
+                                1.0,
+                                &logger,
+                            )?;
+                        }
+                    }
+
+                    Ok(())
+                })
+                .map_err(Into::<SwapBuffersError>::into)
+                .and_then(|x| x)
+                .unwrap();
+        }
+
+        // Send frame events so that client start drawing their next frame
+        state
+            .window_map
+            .borrow()
+            .send_frames(state.start_time.elapsed().as_millis() as u32);
+        display.borrow_mut().flush_clients(&mut state);
+
+        if event_loop
+            .dispatch(Some(Duration::from_millis(16)), &mut state)
+            .is_err()
+        {
+            state.running.store(false, Ordering::SeqCst);
+        } else {
+            display.borrow_mut().flush_clients(&mut state);
+            state.window_map.borrow_mut().refresh();
+            state.output_map.borrow_mut().refresh();
+        }
+    }
+}
+
+fn handle_event(event: WlcsEvent, state: &mut AnvilState<TestState>) {
+    match event {
+        WlcsEvent::Exit => state.running.store(false, Ordering::SeqCst),
+        WlcsEvent::NewClient { stream, client_id } => {
+            let display = state.display.clone();
+            let client = unsafe { display.borrow_mut().create_client(stream.into_raw_fd(), state) };
+            state.backend_data.clients.insert(client_id, client);
+        }
+        e => {
+            // TODO: handle the actual events
+            eprintln!("Unhandled event: {:?}", e);
+        }
+    }
+}

wlcs_anvil/src/renderer.rs

@@ -0,0 +1,121 @@
+use std::cell::Cell;
+
+use cgmath::Vector2;
+use smithay::{
+    backend::{
+        allocator::dmabuf::Dmabuf,
+        renderer::{Frame, ImportDma, ImportShm, Renderer, Texture, Transform},
+        SwapBuffersError,
+    },
+    reexports::wayland_server::protocol::wl_buffer,
+    utils::{Buffer, Physical, Rectangle, Size},
+    wayland::compositor::SurfaceData,
+};
+
+pub struct DummyRenderer {}
+
+impl DummyRenderer {
+    pub fn new() -> DummyRenderer {
+        DummyRenderer {}
+    }
+}
+
+impl Renderer for DummyRenderer {
+    type Error = SwapBuffersError;
+    type TextureId = DummyTexture;
+    type Frame = DummyFrame;
+
+    fn render<F, R>(
+        &mut self,
+        _size: Size<i32, Physical>,
+        _transform: Transform,
+        rendering: F,
+    ) -> Result<R, Self::Error>
+    where
+        F: FnOnce(&mut Self, &mut Self::Frame) -> R,
+    {
+        let mut frame = DummyFrame {};
+        Ok(rendering(self, &mut frame))
+    }
+}
+
+impl ImportShm for DummyRenderer {
+    fn import_shm_buffer(
+        &mut self,
+        buffer: &wl_buffer::WlBuffer,
+        surface: Option<&SurfaceData>,
+        _damage: &[Rectangle<i32, Buffer>],
+    ) -> Result<<Self as Renderer>::TextureId, <Self as Renderer>::Error> {
+        use smithay::wayland::shm::with_buffer_contents;
+        let ret = with_buffer_contents(&buffer, |slice, data| {
+            let offset = data.offset as u32;
+            let width = data.width as u32;
+            let height = data.height as u32;
+            let stride = data.stride as u32;
+
+            let mut x = 0;
+            for h in 0..height {
+                for w in 0..width {
+                    x |= slice[(offset + w + h * stride) as usize];
+                }
+            }
+
+            if let Some(data) = surface {
+                data.data_map.insert_if_missing(|| Cell::new(0u8));
+                data.data_map.get::<Cell<u8>>().unwrap().set(x);
+            }
+
+            (width, height)
+        });
+
+        match ret {
+            Ok((width, height)) => Ok(DummyTexture { width, height }),
+            Err(e) => Err(SwapBuffersError::TemporaryFailure(Box::new(e))),
+        }
+    }
+}
+
+impl ImportDma for DummyRenderer {
+    fn import_dmabuf(
+        &mut self,
+        _dmabuf: &Dmabuf,
+    ) -> Result<<Self as Renderer>::TextureId, <Self as Renderer>::Error> {
+        unimplemented!()
+    }
+}
+
+pub struct DummyFrame {}
+
+impl Frame for DummyFrame {
+    type Error = SwapBuffersError;
+    type TextureId = DummyTexture;
+
+    fn clear(&mut self, _color: [f32; 4]) -> Result<(), Self::Error> {
+        Ok(())
+    }
+
+    fn render_texture(
+        &mut self,
+        _texture: &Self::TextureId,
+        _matrix: cgmath::Matrix3<f32>,
+        tex_coords: [Vector2<f32>; 4],
+        _alpha: f32,
+    ) -> Result<(), Self::Error> {
+        Ok(())
+    }
+}
+
+pub struct DummyTexture {
+    width: u32,
+    height: u32,
+}
+
+impl Texture for DummyTexture {
+    fn width(&self) -> u32 {
+        self.width
+    }
+
+    fn height(&self) -> u32 {
+        self.height
+    }
+}