diff --git a/src/doctor.rs b/src/doctor.rs
new file mode 100644
index 0000000..c8a9462
--- /dev/null
+++ b/src/doctor.rs
@@ -0,0 +1,263 @@
+use std::fmt;
+use std::path::Path;
+
+use anyhow::{Result, bail};
+
+use crate::config;
+use crate::niri;
+use crate::wayland::Wayland;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum Level {
+    Ok,
+    Warn,
+    Fail,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Check {
+    pub level: Level,
+    pub text: String,
+}
+
+impl fmt::Display for Check {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let tag = match self.level {
+            Level::Ok => "ok",
+            Level::Warn => "warn",
+            Level::Fail => "fail",
+        };
+        write!(f, "{tag:<5} {}", self.text)
+    }
+}
+
+fn check(level: Level, text: impl Into<String>) -> Check {
+    Check {
+        level,
+        text: text.into(),
+    }
+}
+
+/// Globals valw can't work without: (interface, minimum version, used for).
+const REQUIRED: [(&str, u32, &str); 7] = [
+    ("wl_compositor", 1, "surfaces"),
+    ("wl_shm", 1, "pixel buffers"),
+    ("wl_seat", 1, "mouse and keyboard"),
+    ("zxdg_output_manager_v1", 2, "output names and positions"),
+    ("zwlr_layer_shell_v1", 1, "the selection overlay"),
+    ("zwlr_screencopy_manager_v1", 1, "screen capture"),
+    ("wp_viewporter", 1, "sharp overlays at fractional scale"),
+];
+
+/// Globals that enable a feature: (any of these interfaces, feature).
+const OPTIONAL: [(&[&str], &str); 2] = [
+    (
+        &["wp_cursor_shape_manager_v1"],
+        "crosshair cursor in region mode",
+    ),
+    (
+        &[
+            "ext_data_control_manager_v1",
+            "zwlr_data_control_manager_v1",
+        ],
+        "clipboard copy",
+    ),
+];
+
+pub fn check_globals(globals: &[(String, u32)]) -> Vec<Check> {
+    let version = |name: &str| globals.iter().find(|(i, _)| i == name).map(|&(_, v)| v);
+    let mut checks = Vec::new();
+    for (name, min, purpose) in REQUIRED {
+        checks.push(match version(name) {
+            Some(v) if v >= min => check(Level::Ok, format!("{name} v{v} ({purpose})")),
+            Some(v) => check(
+                Level::Fail,
+                format!("{name} v{v} is too old, need v{min} ({purpose})"),
+            ),
+            None => check(Level::Fail, format!("{name} missing ({purpose})")),
+        });
+    }
+    for (names, feature) in OPTIONAL {
+        checks.push(
+            match names.iter().find_map(|&n| version(n).map(|v| (n, v))) {
+                Some((n, v)) => check(Level::Ok, format!("{n} v{v} ({feature})")),
+                None => check(
+                    Level::Warn,
+                    format!("{} missing ({feature} disabled)", names.join(" / ")),
+                ),
+            },
+        );
+    }
+    checks
+}
+
+pub fn check_niri(version: Result<String>) -> Check {
+    let (y, m) = niri::IPC_VERSION;
+    match version {
+        Err(e) => check(
+            Level::Warn,
+            format!("niri IPC unavailable ({e:#}); using the first output for `screen`"),
+        ),
+        Ok(v) => match niri::parse_version(&v) {
+            Some(found) if found == niri::IPC_VERSION => check(Level::Ok, format!("niri {v}")),
+            _ => check(
+                Level::Warn,
+                format!(
+                    "niri {v}, but valw was built against niri-ipc {y}.{m}; IPC replies may not parse"
+                ),
+            ),
+        },
+    }
+}
+
+pub fn check_config(path: &Path) -> Check {
+    match config::load(path) {
+        Ok(_) if path.exists() => check(Level::Ok, format!("config {}", path.display())),
+        Ok(_) => check(
+            Level::Ok,
+            format!("config {} not found, using defaults", path.display()),
+        ),
+        Err(e) => check(Level::Fail, format!("config: {e:#}")),
+    }
+}
+
+pub fn check_save_dir(dir: &Path) -> Check {
+    let probe = dir.join(".valw-doctor");
+    let result = std::fs::create_dir_all(dir)
+        .and_then(|()| std::fs::write(&probe, b""))
+        .and_then(|()| std::fs::remove_file(&probe));
+    match result {
+        Ok(()) => check(
+            Level::Ok,
+            format!("save directory {} is writable", dir.display()),
+        ),
+        Err(e) => check(
+            Level::Fail,
+            format!("save directory {}: {e}", dir.display()),
+        ),
+    }
+}
+
+/// Runs every check and prints one line each. Fails if any check failed.
+pub fn run() -> Result<()> {
+    let mut checks = Vec::new();
+    match Wayland::connect() {
+        Ok(wl) => {
+            checks.extend(check_globals(&wl.global_list()));
+            for o in wl.outputs() {
+                let g = &o.geom;
+                checks.push(check(
+                    Level::Ok,
+                    format!(
+                        "output {}: {}x{} logical at {},{}, transform {:?}",
+                        g.name, g.width, g.height, g.x, g.y, o.transform
+                    ),
+                ));
+            }
+        }
+        Err(e) => checks.push(check(Level::Fail, format!("wayland: {e:#}"))),
+    }
+    checks.push(check_niri(niri::version()));
+    let config_path = config::default_path();
+    checks.push(check_config(&config_path));
+    if let Ok(config) = config::load(&config_path) {
+        checks.push(check_save_dir(&config.save_dir()));
+    }
+
+    for c in &checks {
+        println!("{c}");
+    }
+    let failed = checks.iter().filter(|c| c.level == Level::Fail).count();
+    if failed > 0 {
+        bail!("{failed} check(s) failed");
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn globals(list: &[(&str, u32)]) -> Vec<(String, u32)> {
+        list.iter().map(|&(n, v)| (n.to_string(), v)).collect()
+    }
+
+    fn niri_26_04() -> Vec<(String, u32)> {
+        globals(&[
+            ("wl_compositor", 6),
+            ("wl_shm", 2),
+            ("wl_seat", 9),
+            ("zxdg_output_manager_v1", 3),
+            ("zwlr_layer_shell_v1", 5),
+            ("zwlr_screencopy_manager_v1", 3),
+            ("wp_viewporter", 1),
+            ("wp_cursor_shape_manager_v1", 2),
+            ("zwlr_data_control_manager_v1", 2),
+            ("ext_data_control_manager_v1", 1),
+        ])
+    }
+
+    #[test]
+    fn all_present_is_all_ok() {
+        let checks = check_globals(&niri_26_04());
+        assert!(checks.iter().all(|c| c.level == Level::Ok), "{checks:#?}");
+        assert!(
+            checks
+                .iter()
+                .any(|c| c.text == "ext_data_control_manager_v1 v1 (clipboard copy)")
+        );
+    }
+
+    #[test]
+    fn missing_required_fails_missing_optional_warns() {
+        let list: Vec<_> = niri_26_04()
+            .into_iter()
+            .filter(|(n, _)| n != "zwlr_screencopy_manager_v1" && n != "wp_cursor_shape_manager_v1")
+            .collect();
+        let checks = check_globals(&list);
+        assert!(checks.contains(&check(
+            Level::Fail,
+            "zwlr_screencopy_manager_v1 missing (screen capture)"
+        )));
+        assert!(checks.contains(&check(
+            Level::Warn,
+            "wp_cursor_shape_manager_v1 missing (crosshair cursor in region mode disabled)"
+        )));
+    }
+
+    #[test]
+    fn old_version_fails() {
+        let mut list = niri_26_04();
+        list.retain(|(n, _)| n != "zxdg_output_manager_v1");
+        list.push(("zxdg_output_manager_v1".into(), 1));
+        assert!(check_globals(&list).contains(&check(
+            Level::Fail,
+            "zxdg_output_manager_v1 v1 is too old, need v2 (output names and positions)"
+        )));
+    }
+
+    #[test]
+    fn niri_versions() {
+        assert_eq!(check_niri(Ok("26.04 (Nixpkgs)".into())).level, Level::Ok);
+        assert_eq!(check_niri(Ok("25.11".into())).level, Level::Warn);
+        assert_eq!(
+            check_niri(Err(anyhow::anyhow!("no socket"))).level,
+            Level::Warn
+        );
+    }
+
+    #[test]
+    fn save_dir_checks() {
+        let dir = tempfile::tempdir().unwrap();
+        assert_eq!(check_save_dir(&dir.path().join("new")).level, Level::Ok);
+        let file = dir.path().join("file");
+        std::fs::write(&file, b"").unwrap();
+        assert_eq!(check_save_dir(&file).level, Level::Fail);
+    }
+
+    #[test]
+    fn line_format() {
+        assert_eq!(check(Level::Warn, "x").to_string(), "warn  x");
+        assert_eq!(check(Level::Ok, "x").to_string(), "ok    x");
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index c5e67c0..ee44c9d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,20 +3,64 @@
 
 mod config;
 mod detach;
+mod doctor;
 mod error;
 mod frame;
 mod lock;
 mod log;
+mod niri;
 mod output;
 mod render;
 mod selection;
+mod wayland;
 
-use clap::Parser;
+use std::process::ExitCode;
+
+use anyhow::Result;
+use chrono::Local;
+use clap::{Parser, Subcommand};
+
+use crate::error::Cancelled;
 
 #[derive(Parser)]
 #[command(version, about = "macOS-style screenshots for niri")]
-struct Cli {}
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
 
-fn main() {
-    Cli::parse();
+#[derive(Subcommand)]
+enum Command {
+    /// Report what the compositor and system support.
+    Doctor,
+}
+
+fn main() -> ExitCode {
+    let cli = Cli::parse();
+    let log = log::init(&log::default_dir(), Local::now());
+    log::install_panic_hook(log.clone());
+    tracing::info!(
+        "valw {} {:?}",
+        env!("CARGO_PKG_VERSION"),
+        std::env::args().collect::<Vec<_>>()
+    );
+
+    match run(cli) {
+        Ok(()) => ExitCode::SUCCESS,
+        Err(e) if e.downcast_ref::<Cancelled>().is_some() => {
+            tracing::info!("cancelled by the user");
+            ExitCode::from(3)
+        }
+        Err(e) => {
+            tracing::error!("{e:#}");
+            eprint!("{}", error::render(&e, log.as_deref()));
+            ExitCode::FAILURE
+        }
+    }
+}
+
+fn run(cli: Cli) -> Result<()> {
+    match cli.command {
+        Command::Doctor => doctor::run(),
+    }
 }
diff --git a/src/niri.rs b/src/niri.rs
new file mode 100644
index 0000000..351dabf
--- /dev/null
+++ b/src/niri.rs
@@ -0,0 +1,61 @@
+use anyhow::{Context, Result, anyhow};
+use niri_ipc::{Request, Response, socket::Socket};
+
+/// The niri release the pinned `niri-ipc` crate belongs to. Keep in sync
+/// with the `niri-ipc = "=X.Y.0"` line in Cargo.toml (a test checks this).
+pub const IPC_VERSION: (u32, u32) = (26, 4);
+
+fn request(request: Request) -> Result<Response> {
+    let mut socket =
+        Socket::connect().context("could not connect to niri (is NIRI_SOCKET set?)")?;
+    socket
+        .send(request)
+        .context("niri IPC request failed")?
+        .map_err(|e| anyhow!("niri replied with an error: {e}"))
+}
+
+/// Name of the output niri has focused, if any.
+pub fn focused_output() -> Result<Option<String>> {
+    match request(Request::FocusedOutput)? {
+        Response::FocusedOutput(output) => Ok(output.map(|o| o.name)),
+        other => Err(anyhow!("unexpected niri reply: {other:?}")),
+    }
+}
+
+/// niri's version string, e.g. "26.04 (Nixpkgs)".
+pub fn version() -> Result<String> {
+    match request(Request::Version)? {
+        Response::Version(v) => Ok(v),
+        other => Err(anyhow!("unexpected niri reply: {other:?}")),
+    }
+}
+
+/// `(year, month)` from a niri version string like "26.04 (Nixpkgs)".
+pub fn parse_version(v: &str) -> Option<(u32, u32)> {
+    let (year, rest) = v.split_once('.')?;
+    let month: String = rest.chars().take_while(char::is_ascii_digit).collect();
+    Some((year.parse().ok()?, month.parse().ok()?))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parses_versions() {
+        assert_eq!(parse_version("26.04 (Nixpkgs)"), Some((26, 4)));
+        assert_eq!(parse_version("25.11"), Some((25, 11)));
+        assert_eq!(parse_version("26.04.1-dev"), Some((26, 4)));
+        assert_eq!(parse_version("unknown"), None);
+    }
+
+    #[test]
+    fn ipc_version_matches_cargo_toml() {
+        let (y, m) = IPC_VERSION;
+        let pin = format!("niri-ipc = \"={y}.{m}.0\"");
+        assert!(
+            include_str!("../Cargo.toml").contains(&pin),
+            "Cargo.toml should pin {pin}"
+        );
+    }
+}
diff --git a/src/wayland.rs b/src/wayland.rs
new file mode 100644
index 0000000..3e95a4d
--- /dev/null
+++ b/src/wayland.rs
@@ -0,0 +1,427 @@
+use std::time::Instant;
+
+use anyhow::{Context, Result, bail};
+use rustix::event::{PollFd, PollFlags, Timespec, poll};
+use smithay_client_toolkit::{
+    compositor::{CompositorHandler, CompositorState},
+    delegate_registry,
+    output::{OutputHandler, OutputState},
+    registry::{ProvidesRegistryState, RegistryState},
+    registry_handlers,
+    seat::{
+        Capability, SeatHandler, SeatState,
+        keyboard::{KeyEvent, KeyboardHandler, Keysym, Modifiers, RawModifiers},
+        pointer::{PointerEvent, PointerHandler, cursor_shape::CursorShapeManager},
+    },
+    shell::wlr_layer::{LayerShell, LayerShellHandler, LayerSurface, LayerSurfaceConfigure},
+    shm::{Shm, ShmHandler},
+};
+use wayland_client::{
+    Connection, EventQueue, QueueHandle,
+    globals::{GlobalList, registry_queue_init},
+    protocol::{wl_keyboard, wl_output, wl_pointer, wl_seat, wl_surface},
+};
+use wayland_protocols::wp::cursor_shape::v1::client::wp_cursor_shape_device_v1::WpCursorShapeDeviceV1;
+use wayland_protocols::wp::viewporter::client::{
+    wp_viewport::WpViewport, wp_viewporter::WpViewporter,
+};
+use wayland_protocols_wlr::screencopy::v1::client::zwlr_screencopy_manager_v1::ZwlrScreencopyManagerV1;
+
+use crate::error::HintExt;
+use crate::frame::OutputGeom;
+
+/// An output as valw sees it.
+#[derive(Debug, Clone)]
+pub struct Output {
+    pub wl: wl_output::WlOutput,
+    pub geom: OutputGeom,
+    pub transform: wl_output::Transform,
+}
+
+pub struct Wayland {
+    pub conn: Connection,
+    pub queue: EventQueue<State>,
+    pub globals: GlobalList,
+    pub state: State,
+}
+
+pub struct State {
+    registry: RegistryState,
+    pub outputs: OutputState,
+    pub seat: SeatState,
+    pub shm: Shm,
+    pub compositor: CompositorState,
+    pub layer_shell: Option<LayerShell>,
+    pub screencopy: Option<ZwlrScreencopyManagerV1>,
+    pub viewporter: Option<WpViewporter>,
+    pub cursor_shape: Option<CursorShapeManager>,
+    pub cursor_device: Option<WpCursorShapeDeviceV1>,
+    pub keyboard: Option<wl_keyboard::WlKeyboard>,
+    pub pointer: Option<wl_pointer::WlPointer>,
+}
+
+impl Wayland {
+    pub fn connect() -> Result<Wayland> {
+        let conn = Connection::connect_to_env()
+            .context("could not connect to the Wayland compositor")
+            .hint("valw needs a Wayland session; is WAYLAND_DISPLAY set?")?;
+        let (globals, mut queue) = registry_queue_init::<State>(&conn)
+            .context("could not read the compositor's globals")?;
+        let qh = queue.handle();
+
+        let mut state = State {
+            registry: RegistryState::new(&globals),
+            outputs: OutputState::new(&globals, &qh),
+            seat: SeatState::new(&globals, &qh),
+            shm: Shm::bind(&globals, &qh).context("compositor has no wl_shm")?,
+            compositor: CompositorState::bind(&globals, &qh)
+                .context("compositor has no wl_compositor")?,
+            layer_shell: LayerShell::bind(&globals, &qh).ok(),
+            screencopy: globals.bind(&qh, 1..=3, ()).ok(),
+            viewporter: globals.bind(&qh, 1..=1, ()).ok(),
+            cursor_shape: CursorShapeManager::bind(&globals, &qh).ok(),
+            cursor_device: None,
+            keyboard: None,
+            pointer: None,
+        };
+        // Two round trips: one for wl_output, one for the xdg-output details.
+        queue
+            .roundtrip(&mut state)
+            .context("Wayland round trip failed")?;
+        queue
+            .roundtrip(&mut state)
+            .context("Wayland round trip failed")?;
+
+        let wl = Wayland {
+            conn,
+            queue,
+            globals,
+            state,
+        };
+        wl.log_environment();
+        Ok(wl)
+    }
+
+    /// All outputs with a known name and logical geometry.
+    pub fn outputs(&self) -> Vec<Output> {
+        self.state
+            .outputs
+            .outputs()
+            .filter_map(|wl| {
+                let info = self.state.outputs.info(&wl)?;
+                let (x, y) = info.logical_position?;
+                let (width, height) = info.logical_size?;
+                Some(Output {
+                    geom: OutputGeom {
+                        name: info
+                            .name
+                            .clone()
+                            .unwrap_or_else(|| format!("output-{}", info.id)),
+                        x,
+                        y,
+                        width,
+                        height,
+                    },
+                    transform: info.transform,
+                    wl,
+                })
+            })
+            .collect()
+    }
+
+    /// `(interface, version)` of every global, sorted.
+    pub fn global_list(&self) -> Vec<(String, u32)> {
+        let mut list: Vec<_> = self
+            .globals
+            .contents()
+            .clone_list()
+            .into_iter()
+            .map(|g| (g.interface, g.version))
+            .collect();
+        list.sort();
+        list.dedup();
+        list
+    }
+
+    fn log_environment(&self) {
+        let globals: Vec<String> = self
+            .global_list()
+            .into_iter()
+            .map(|(interface, version)| format!("{interface} v{version}"))
+            .collect();
+        tracing::info!("globals: {}", globals.join(", "));
+        for o in self.outputs() {
+            let g = &o.geom;
+            tracing::info!(
+                "output {} at {},{} size {}x{} (logical) transform {:?}",
+                g.name,
+                g.x,
+                g.y,
+                g.width,
+                g.height,
+                o.transform
+            );
+        }
+    }
+
+    /// Dispatches events until `done` returns true or `deadline` passes.
+    pub fn dispatch_until(
+        &mut self,
+        deadline: Instant,
+        mut done: impl FnMut(&State) -> bool,
+    ) -> Result<()> {
+        loop {
+            self.queue
+                .dispatch_pending(&mut self.state)
+                .context("Wayland dispatch failed")?;
+            if done(&self.state) {
+                return Ok(());
+            }
+            self.queue.flush().context("Wayland flush failed")?;
+            let Some(guard) = self.queue.prepare_read() else {
+                continue;
+            };
+            let left = deadline.saturating_duration_since(Instant::now());
+            if left.is_zero() {
+                bail!("the compositor did not answer in time");
+            }
+            let timeout = Timespec::try_from(left).expect("duration fits");
+            let fd = guard.connection_fd();
+            let mut fds = [PollFd::new(&fd, PollFlags::IN)];
+            match poll(&mut fds, Some(&timeout)) {
+                Ok(0) => continue,
+                Ok(_) => {
+                    guard.read().context("Wayland read failed")?;
+                }
+                Err(rustix::io::Errno::INTR) => continue,
+                Err(e) => return Err(e).context("poll failed"),
+            }
+        }
+    }
+
+    /// Dispatches events until `done` returns true. Waits as long as it takes.
+    pub fn dispatch_blocking(&mut self, mut done: impl FnMut(&State) -> bool) -> Result<()> {
+        while !done(&self.state) {
+            self.queue
+                .blocking_dispatch(&mut self.state)
+                .context("Wayland dispatch failed")?;
+        }
+        Ok(())
+    }
+}
+
+impl CompositorHandler for State {
+    fn scale_factor_changed(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_surface::WlSurface,
+        _: i32,
+    ) {
+    }
+
+    fn transform_changed(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_surface::WlSurface,
+        _: wl_output::Transform,
+    ) {
+    }
+
+    fn frame(&mut self, _: &Connection, _: &QueueHandle<Self>, _: &wl_surface::WlSurface, _: u32) {}
+
+    fn surface_enter(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_surface::WlSurface,
+        _: &wl_output::WlOutput,
+    ) {
+    }
+
+    fn surface_leave(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_surface::WlSurface,
+        _: &wl_output::WlOutput,
+    ) {
+    }
+}
+
+impl OutputHandler for State {
+    fn output_state(&mut self) -> &mut OutputState {
+        &mut self.outputs
+    }
+
+    fn new_output(&mut self, _: &Connection, _: &QueueHandle<Self>, _: wl_output::WlOutput) {}
+
+    fn update_output(&mut self, _: &Connection, _: &QueueHandle<Self>, _: wl_output::WlOutput) {}
+
+    fn output_destroyed(&mut self, _: &Connection, _: &QueueHandle<Self>, _: wl_output::WlOutput) {}
+}
+
+impl LayerShellHandler for State {
+    fn closed(&mut self, _: &Connection, _: &QueueHandle<Self>, _: &LayerSurface) {}
+
+    fn configure(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &LayerSurface,
+        _: LayerSurfaceConfigure,
+        _: u32,
+    ) {
+    }
+}
+
+impl SeatHandler for State {
+    fn seat_state(&mut self) -> &mut SeatState {
+        &mut self.seat
+    }
+
+    fn new_seat(&mut self, _: &Connection, _: &QueueHandle<Self>, _: wl_seat::WlSeat) {}
+
+    fn new_capability(
+        &mut self,
+        _: &Connection,
+        qh: &QueueHandle<Self>,
+        seat: wl_seat::WlSeat,
+        capability: Capability,
+    ) {
+        if capability == Capability::Keyboard && self.keyboard.is_none() {
+            self.keyboard = self.seat.get_keyboard(qh, &seat, None).ok();
+        }
+        if capability == Capability::Pointer
+            && self.pointer.is_none()
+            && let Ok(pointer) = self.seat.get_pointer(qh, &seat)
+        {
+            self.cursor_device = self
+                .cursor_shape
+                .as_ref()
+                .map(|m| m.get_shape_device(&pointer, qh));
+            self.pointer = Some(pointer);
+        }
+    }
+
+    fn remove_capability(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: wl_seat::WlSeat,
+        capability: Capability,
+    ) {
+        if capability == Capability::Keyboard
+            && let Some(k) = self.keyboard.take()
+        {
+            k.release();
+        }
+        if capability == Capability::Pointer {
+            if let Some(d) = self.cursor_device.take() {
+                d.destroy();
+            }
+            if let Some(p) = self.pointer.take() {
+                p.release();
+            }
+        }
+    }
+
+    fn remove_seat(&mut self, _: &Connection, _: &QueueHandle<Self>, _: wl_seat::WlSeat) {}
+}
+
+impl KeyboardHandler for State {
+    fn enter(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: &wl_surface::WlSurface,
+        _: u32,
+        _: &[u32],
+        _: &[Keysym],
+    ) {
+    }
+
+    fn leave(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: &wl_surface::WlSurface,
+        _: u32,
+    ) {
+    }
+
+    fn press_key(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: u32,
+        _: KeyEvent,
+    ) {
+    }
+
+    fn repeat_key(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: u32,
+        _: KeyEvent,
+    ) {
+    }
+
+    fn release_key(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: u32,
+        _: KeyEvent,
+    ) {
+    }
+
+    fn update_modifiers(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_keyboard::WlKeyboard,
+        _: u32,
+        _: Modifiers,
+        _: RawModifiers,
+        _: u32,
+    ) {
+    }
+}
+
+impl PointerHandler for State {
+    fn pointer_frame(
+        &mut self,
+        _: &Connection,
+        _: &QueueHandle<Self>,
+        _: &wl_pointer::WlPointer,
+        _: &[PointerEvent],
+    ) {
+    }
+}
+
+impl ShmHandler for State {
+    fn shm_state(&mut self) -> &mut Shm {
+        &mut self.shm
+    }
+}
+
+impl ProvidesRegistryState for State {
+    fn registry(&mut self) -> &mut RegistryState {
+        &mut self.registry
+    }
+    registry_handlers![OutputState, SeatState];
+}
+
+delegate_registry!(State);
+smithay_client_toolkit::delegate_dispatch2!(State);
+wayland_client::delegate_noop!(State: ZwlrScreencopyManagerV1);
+wayland_client::delegate_noop!(State: WpViewporter);
+wayland_client::delegate_noop!(State: WpViewport);