Container screens: rustfmt

Co-Authored-By: Claude Opus 5.5 <[email protected]>

AGENTS.md

@@ -186,7 +186,7 @@ state stays separate from the library tests. This compiles gameplay twice for ex
 | Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`, `mobs/cem.rs` + `mobs/cem_anim.rs` (OptiFine/EMF entity models and their animations); `horizon-client-core/src/lang.rs`; crates `horizon-assets`, `horizon-optifine`; G: `packs.rs` |
 | Agent control | L: `control.rs` (socket), `bin/horizon-ctl/`; G: `control.rs`, `agent.rs`, `events.rs`, `ui_control.rs` ([docs/agent-control.md](docs/agent-control.md)) |
 | Mods | crate `horizon-mods`; G: `mods.rs`; L: `mod_content.rs`, `mod_list.rs` |
-| Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs`, `tweaks.rs`, `options.rs` |
+| Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs` + `extras/` (each extra's glue: `mouse_tweaks.rs`, `sorting.rs`, `pvp.rs`, `reconnect.rs`), `options.rs` |
 
 ## How `Game` is organised
 

crates/horizon-client-render/examples/standard_pack_gpu_entities.rs

@@ -362,7 +362,7 @@ fn fixture_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client-render/examples/world_warp_check.rs

@@ -430,7 +430,7 @@ fn fixture_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client-render/src/gfx.rs

@@ -1001,8 +1001,8 @@ pub struct Frame<'a> {
     pub outline_after_terrain: bool,
     /// `BlockOutlineRenderState.highContrast`: a thick black outline under a bright one.
     pub outline_high_contrast: bool,
-    /// The PvP & HUD page's outline and hit colour (`pvp::Frame`; default: vanilla's).
-    pub pvp: crate::pvp::Frame,
+    /// The outline, hurt overlay and glint colours a crate above set (`horizon_hooks::look`).
+    pub look: horizon_hooks::look::Frame,
     /// `lines` with a colour and pixel width (`gizmos::camera_relative`):
     /// the fishing line and debug gizmos, depth tested, then gizmos drawn
     /// over everything.
@@ -8506,9 +8506,9 @@ impl Renderer {
             colored_count: [
                 frame.colored_lights.len().min(crate::dynamic_light::MAX) as u32,
                 // PvP & HUD's hit colour: entity.wgsl's hurt texel, 0 for vanilla's.
-                frame.pvp.hurt_texel,
+                frame.look.hurt_texel,
                 // PvP & HUD's glint colour: entity.wgsl's `tinted_glint`, 0 for vanilla's.
-                frame.pvp.glint,
+                frame.look.glint,
                 0,
             ],
             emissive_layers: {
@@ -9495,7 +9495,7 @@ impl Renderer {
                 }
             };
             // A custom outline (PvP & HUD) takes the bright stroke's colour, scales both widths.
-            let (custom, scale) = frame.pvp.outline.map_or((None, 1.0), |(c, s)| (Some(c), s));
+            let (custom, scale) = frame.look.outline.map_or((None, 1.0), |o| (Some(o.0), o.1));
             if frame.outline_high_contrast {
                 stroke(0xff00_0000, 7.0 * scale, lines);
                 stroke(custom.unwrap_or(0xff57_ffe1), width * scale, lines);

crates/horizon-client-render/src/gfx/capture.rs

@@ -524,7 +524,7 @@ impl Scene {
             outline: Vec::new(),
             outline_after_terrain: false,
             outline_high_contrast: false,
-            pvp: Default::default(),
+            look: Default::default(),
             debug_lines: &[],
             debug_lines_on_top: &[],
             debug_crosshair: &[],

crates/horizon-client-render/src/gfx/pack_post/depth_test.rs

@@ -602,7 +602,7 @@ pub(super) fn fixture_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client-render/src/gfx/pack_post/destination_tests.rs

@@ -440,7 +440,7 @@ fn fixture_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client-render/src/gfx/pack_post/world_target_tests.rs

@@ -409,7 +409,7 @@ fn frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client-render/src/gfx/pack_uniforms.rs

@@ -2664,7 +2664,7 @@ pub(super) mod initial_history_tests {
             outline: Vec::new(),
             outline_after_terrain: false,
             outline_high_contrast: false,
-            pvp: Default::default(),
+            look: Default::default(),
             debug_lines: &[],
             debug_lines_on_top: &[],
             debug_crosshair: &[],

crates/horizon-client-render/src/pvp.rs

@@ -4,6 +4,7 @@
 //! Horizon Settings > PvP & HUD. Every option is off by default, so the game looks like
 //! vanilla until the player changes one, and none of them shows anything vanilla doesn't
 //! already tell the player.
+use horizon_hooks::look::Look;
 
 /// Colours the PvP options pick from. `Inverted` is vanilla's crosshair blend: the colour
 /// under it, inverted.
@@ -263,15 +264,6 @@ impl ViewWeather {
         Self::ALL.into_iter().find(|c| c.name() == s)
     }
 }
-/// The day time this player sees with `fixed` set: the same day (the moon's phase follows the
-/// world's), at that time.
-pub fn view_day_time(world: i64, fixed: Option<ViewTime>) -> i64 {
-    match fixed {
-        Some(t) => world.div_euclid(24000) * 24000 + t.day_time(),
-        None => world,
-    }
-}
-
 /// The crosshair's look. Its defaults draw vanilla's: a 15-pixel cross, one pixel thick,
 /// inverting what is under it.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -528,24 +520,36 @@ impl Hit {
     }
 }
 
-/// What the renderer reads of these options each frame (`FrameInputs::pvp`); the default is
-/// vanilla's look.
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-pub struct Frame {
-    /// The block outline's stroke ([`Outline::stroke`]).
-    pub outline: Option<(u32, f32)>,
-    /// The hurt overlay texel ([`Hit::texel`]), 0 for vanilla's.
-    pub hurt_texel: u32,
-    /// The glint's colour ([`Tweaks::glint_texel`]), 0 for vanilla's.
-    pub glint: u32,
-}
 impl Pvp {
-    pub fn frame(&self) -> Frame {
-        Frame {
-            outline: self.outline.stroke(),
-            hurt_texel: self.hit.texel(),
-            glint: self.tweaks.glint_texel(),
-        }
+    /// What the engine reads of these options (`horizon_hooks::look`): all it draws differently.
+    /// Sets PvP & HUD's fields of `look`, the others' stay.
+    pub fn apply(&self, look: &mut Look) {
+        let (c, t) = (self.combat, self.tweaks);
+        look.legacy_pose = c.legacy;
+        look.hide_attack_indicator = c.legacy && !c.indicator;
+        look.mute_attack_sounds = c.legacy && c.sounds;
+        look.hide_attack_particles = c.legacy;
+        look.frame.outline = self.outline.stroke();
+        look.frame.hurt_texel = self.hit.texel();
+        look.frame.glint = t.glint_texel();
+        look.shield_size = t.shield_size;
+        look.totem_scale = f32::from(t.totem_size) / 100.0;
+        look.fire_lower = f32::from(t.fire_lower) / 100.0;
+        look.clear_lava = t.clear_lava;
+        look.clear_water = t.clear_water;
+        look.chat.timestamps = self.chat.timestamps;
+        look.chat.compact = self.chat.compact;
+        look.chat.copy = self.chat.copy;
+        look.chat.search = self.chat.search;
+        look.hide_effect_icons = self.hud.effects;
+        look.time_of_day = t.time.map(ViewTime::day_time);
+        look.weather = t.weather.map(ViewWeather::levels);
+    }
+    /// [`Pvp::apply`] on vanilla's look.
+    pub fn look(&self) -> Look {
+        let mut look = Look::default();
+        self.apply(&mut look);
+        look
     }
 }
 
@@ -741,15 +745,6 @@ pub struct ChatOptions {
     /// Ctrl+F in the chat searches the chat's messages.
     pub search: bool,
 }
-impl ChatOptions {
-    /// What `chat::Chat` lays its lines out with.
-    pub fn qol(&self) -> crate::chat::ChatQol {
-        crate::chat::ChatQol {
-            timestamps: self.timestamps,
-            compact: self.compact,
-        }
-    }
-}
 
 /// Combat feel (`docs/pvp.md`): how fights look. Legacy draws them as 1.8.9 did; what the
 /// game sends to a server never changes, so a vanilla server and its anticheat see 26.3.
@@ -766,21 +761,6 @@ pub struct Combat {
     /// (`horizon_client::legacy_combat`). Never used as a client of a server.
     pub rules: bool,
 }
-impl Combat {
-    /// Whether this client leaves out sound `name` a server sent: under Legacy with its
-    /// sounds, the `entity.player.attack.*` family (strong, weak, crit, sweep, knockback,
-    /// nodamage), which 1.9 brought with the attack cooldown.
-    pub fn mutes_sound(&self, name: &str) -> bool {
-        let name = name.strip_prefix("minecraft:").unwrap_or(name);
-        self.legacy && self.sounds && name.starts_with("entity.player.attack.")
-    }
-    /// Whether this client leaves out particles of `ty` a server sent: under Legacy, the
-    /// sweep and the damage hearts, which 1.9 brought (1.8.9's hits show crits only).
-    pub fn hides_particle(&self, ty: crate::particles::ParticleType) -> bool {
-        use crate::particles::ParticleType as T;
-        self.legacy && matches!(ty, T::SweepAttack | T::DamageIndicator)
-    }
-}
 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Pvp {
@@ -1707,18 +1687,6 @@ mod tests {
         assert_eq!(fresh.extras.pvp.tweaks.fire_lower, PRESET_FIRE_LOWER);
     }
 
-    #[test]
-    fn a_fixed_time_keeps_the_worlds_day() {
-        // Day 9 at 5000: the moon's phase (the day number) stays, the time of day is the chosen.
-        let world = 9 * 24000 + 5000;
-        assert_eq!(view_day_time(world, None), world);
-        assert_eq!(
-            view_day_time(world, Some(ViewTime::Midnight)),
-            9 * 24000 + 18000
-        );
-        assert_eq!(view_day_time(-100, Some(ViewTime::Noon)), -24000 + 6000);
-    }
-
     #[test]
     fn the_glint_colour_reaches_the_shaders_as_rgb_bytes() {
         let mut t = Tweaks::default();
@@ -1805,31 +1773,33 @@ mod tests {
         }
     }
 
+    /// Legacy leaves out what 1.9 added to a hit: its sounds only with the sounds option, the
+    /// sweep and hearts always; the indicator stays when kept. Modern changes nothing.
     #[test]
-    fn legacy_leaves_out_what_1_9_added_to_a_hit() {
-        use crate::particles::ParticleType as T;
-        let modern = Combat::default();
-        let legacy = Combat {
-            legacy: true,
-            ..Combat::default()
-        };
-        let sounds = Combat {
-            sounds: true,
-            ..legacy
-        };
-        for name in [
-            "minecraft:entity.player.attack.strong",
-            "entity.player.attack.sweep",
-            "minecraft:entity.player.attack.nodamage",
-        ] {
-            assert!(sounds.mutes_sound(name), "{name}");
-            assert!(!legacy.mutes_sound(name), "only with the sounds option");
-            assert!(!modern.mutes_sound(name));
-        }
-        // 1.8.9 had the hurt sound: it stays.
-        assert!(!sounds.mutes_sound("minecraft:entity.player.hurt"));
-        assert!(legacy.hides_particle(T::SweepAttack) && legacy.hides_particle(T::DamageIndicator));
-        assert!(!legacy.hides_particle(T::Crit) && !legacy.hides_particle(T::EnchantedHit));
-        assert!(!modern.hides_particle(T::SweepAttack));
+    fn combat_feel_reaches_the_look() {
+        let mut pvp = Pvp::default();
+        assert_eq!(pvp.look(), Look::default(), "vanilla's look");
+        let strong = "minecraft:entity.player.attack.strong";
+        pvp.combat.legacy = true;
+        let look = pvp.look();
+        assert!(look.legacy_pose && look.hide_attack_particles && look.hide_attack_indicator);
+        assert!(!look.mutes_sound(strong), "only with the sounds option");
+        pvp.combat.sounds = true;
+        pvp.combat.indicator = true;
+        let look = pvp.look();
+        assert!(look.mutes_sound(strong) && !look.hide_attack_indicator);
+    }
+
+    #[test]
+    fn view_time_weather_and_sizes_reach_the_look() {
+        let mut pvp = Pvp::default();
+        pvp.tweaks.time = Some(ViewTime::Midnight);
+        pvp.tweaks.weather = Some(ViewWeather::Thunder);
+        pvp.tweaks.totem_size = 50;
+        pvp.tweaks.fire_lower = 40;
+        let look = pvp.look();
+        assert_eq!(look.day_time(9 * 24000 + 5000), 9 * 24000 + 18000);
+        assert_eq!(look.weather, Some((1.0, 1.0)));
+        assert_eq!((look.totem_scale, look.fire_lower), (0.5, 0.4));
     }
 }

crates/horizon-client-render/src/settings.rs

@@ -337,6 +337,13 @@ impl Settings {
             .and_then(|mode| self.video_modes.iter().position(|m| *m == mode))
             .map_or(-1, |i| i as i32)
     }
+    /// Loads only the crates' settings stores (`horizon_hooks::settings`) from the files next to
+    /// `path`, into the seat whose turn it is (`horizon_hooks::seat`): a splitscreen player whose
+    /// settings were made from P1's rather than loaded.
+    pub fn load_stores(path: &Path) {
+        let dir = path.parent();
+        horizon_hooks::settings::engine::load(&mut |file| fs::read_to_string(dir?.join(file)).ok());
+    }
     pub fn load(path: &Path) -> Self {
         let mut horizon = path
             .parent()

crates/horizon-client/src/client_lib.rs

@@ -87,6 +87,7 @@ pub mod item_tooltip;
 pub mod join_seq;
 pub mod lan;
 pub mod landing;
+pub mod last_server;
 pub mod legacy_combat;
 pub mod locator_bar;
 pub mod lod_net;

crates/horizon-client/src/entry.rs

@@ -21,6 +21,11 @@ pub fn main_with(mods: crate::mod_api::Mods) {
     horizon_client::telemetry::mark_start();
     // Opt-in telemetry keeps each crash report (docs/telemetry.md), whatever the mode.
     crash::on_report(horizon_client::telemetry::keep_crash);
+    // Auto-reconnect, a Horizon extra still in the engine crates, runs on the connection hooks as
+    // the crates above do (horizon_client::reconnect; docs/layers.md, plan M5).
+    if cfg!(feature = "horizon-extras") {
+        let _ = horizon_hooks::register(&horizon_client::reconnect::HOOKS);
+    }
     // Crates above the engine registered their hooks before this (horizon-official's `main`);
     // none registers after this point.
     horizon_hooks::engine::seal();

crates/horizon-client/src/extras_hud.rs

@@ -189,6 +189,52 @@ impl hud::Canvas for Canvas<'_> {
     }
 }
 
+/// Draws on an open container screen (`horizon_hooks::containers`): `draw` gets a canvas whose
+/// (0, 0) is the panel's top left corner, at `origin` on the screen. It has no corners: `place`
+/// answers `None`.
+pub fn draw_on_panel(
+    batch: &mut HudBatch,
+    atlas: &HudAtlas,
+    origin: (f32, f32),
+    draw: impl FnOnce(&mut dyn hud::Canvas),
+) {
+    draw(&mut Panel {
+        batch,
+        atlas,
+        origin,
+    });
+}
+
+struct Panel<'a> {
+    batch: &'a mut HudBatch,
+    atlas: &'a HudAtlas,
+    origin: (f32, f32),
+}
+
+impl hud::Canvas for Panel<'_> {
+    fn size(&self) -> (f32, f32) {
+        (self.batch.width, self.batch.height)
+    }
+    fn tr(&self, key: &str) -> String {
+        crate::lang::get(key)
+    }
+    fn text_width(&self, text: &str) -> f32 {
+        HudBatch::text_width(self.atlas, text)
+    }
+    fn text(&mut self, x: f32, y: f32, text: &str, argb: u32, shadow: bool) {
+        let (x, y) = (self.origin.0 + x, self.origin.1 + y);
+        self.batch
+            .text(self.atlas, text, x, y, argb_color(argb), shadow);
+    }
+    fn fill(&mut self, x: f32, y: f32, w: f32, h: f32, argb: u32) {
+        let (x, y) = (self.origin.0 + x, self.origin.1 + y);
+        self.batch.fill(self.atlas, x, y, w, h, argb_color(argb));
+    }
+    fn place(&mut self, _: hud::Corner, _: f32, _: f32) -> Option<(f32, f32)> {
+        None
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/horizon-client/src/game.rs

@@ -237,6 +237,7 @@ mod llamas;
 mod loading_screen;
 mod loading_window;
 mod locator_bar;
+mod look;
 mod loom;
 mod mace;
 mod machines;
@@ -383,7 +384,6 @@ mod potions;
 mod powder_snow;
 mod prediction;
 mod pumpkin;
-mod pvp;
 mod quick_actions;
 mod raids;
 mod random_textures;
@@ -467,7 +467,6 @@ mod trial_spawner;
 mod trial_visuals;
 mod trident;
 mod tutorial;
-mod tweaks;
 mod ui_control;
 mod use_hand;
 mod using_item;
@@ -2222,7 +2221,7 @@ struct Game<'a> {
     /// `AbstractContainerScreen`'s quick craft and skip-release state.
     inv_clicks: horizon_client::container_screen::Clicks,
     /// The Mouse Tweaks extra's drag and wheel (`tweaks`).
-    tweaks: tweaks::Tweaks,
+    tweaks: extras::mouse_tweaks::Tweaks,
     /// The wheel and hovered slot of `BundleMouseActions`.
     bundle_mouse: bundles::BundleMouse,
     /// The last inventory click, for the double click that gathers a stack.
@@ -2811,10 +2810,9 @@ struct Game<'a> {
     pending_bench: Option<(Instant, std::sync::mpsc::Sender<String>)>,
     /// Recent frame times for the performance overlay.
     frame_graph: horizon_client::perf_overlay::FrameGraph,
-    /// Horizon's extras (minimap, auto-reconnect; mods' counters): `game/extras.rs`.
+    /// Horizon's extras (mods' minimap and counters; PvP & HUD's): `game/extras.rs`.
     extras: extras::ExtrasState,
-    /// The PvP & HUD options' state (`game/pvp.rs`).
-    pvp: pvp::PvpState,
+    pvp: extras::pvp::PvpState,
     /// Horizon mods (`game/mods.rs`), none running unless turned on.
     mods: mods::ModsState,
     /// Every item and recipe, for mods (`game/native_recipes.rs`), made once.
@@ -2879,9 +2877,9 @@ struct Game<'a> {
     entity_attachments: HashMap<[i32; 4], horizon_world::attachments::Attachments>,
     /// Connected to a server: the world comes from the network (game/remote.rs).
     remote: Option<remote::Remote>,
-    /// The open connection joined from Realms: `ServerData.isRealm` for the friends
-    /// service's presence status.
-    realm_session: bool,
+    /// The multiplayer server connected to last, and whether it is a Realm; the connection's
+    /// lifecycle reaches the hooks through it (`last_server.rs`).
+    last_server: horizon_client::last_server::LastServer,
     /// Active packet replay session (game/studio.rs).
     pub(super) studio_replay: Option<horizon_client::studio::ReplayDriver>,
     pub(super) studio_freecam: horizon_client::studio::StudioFreecam,
@@ -5532,7 +5530,7 @@ impl Game<'_> {
             }
         } else if self.remote.is_some() {
             // `getCurrentServer().isRealm()`: the connection came from Realms.
-            if self.realm_session {
+            if self.last_server.realm {
                 PresenceStatus::PlayingRealms
             } else {
                 PresenceStatus::PlayingServer
@@ -5875,7 +5873,7 @@ impl Game<'_> {
     fn hud_layers(&mut self, size: [u32; 2]) -> HudBatch {
         self.pad.guide_shown.clear();
         let mut batch = HudBatch::new(size);
-        batch.glint_colour = self.settings.extras.pvp.tweaks.glint_texel();
+        batch.glint_colour = self.glint_texel();
         // GlobalSettingsUniform's GameTime, for a resource pack's text shader.
         batch.game_time = ((self.world.game_time.rem_euclid(24000)) as f32
             + self.clock.fraction() as f32)
@@ -5988,8 +5986,7 @@ impl Game<'_> {
             // Hud.extractCrosshair / extractItemHotbar / extractPlayerHealth /
             // extractVehicleHealth and the experience bar, laid out by hud_layout.
             // Combat feel Legacy hides the attack indicator unless the player keeps it.
-            let combat = self.settings.extras.pvp.combat;
-            let indicator = if combat.legacy && !combat.indicator {
+            let indicator = if self.attack_indicator_hidden() {
                 0
             } else {
                 self.settings.attack_indicator
@@ -6053,7 +6050,7 @@ impl Game<'_> {
             });
             self.gui_layer("minecraft:effects", &mut batch, |g, batch| {
                 // The PvP & HUD effects widget takes the icons' place.
-                if !g.pvp_effects_shown() {
+                if !g.effect_icons_hidden() {
                     g.draw_effect_icons(batch);
                 }
             });
@@ -6488,7 +6485,7 @@ impl Game<'_> {
         self.draw_hovered_slot_highlight(batch, false, ox, oy);
         self.draw_inventory_slots(batch, ox, oy);
         self.draw_hovered_slot_highlight(batch, true, ox, oy);
-        self.draw_sort_buttons(batch, ox, oy);
+        self.draw_container_extras(batch, ox, oy);
         self.draw_recipe_book(batch);
         let effect_tip = if self.container.is_none() && self.craft_size == 2 && !self.mount_active()
         {
@@ -9898,7 +9895,7 @@ impl Game<'_> {
             outline,
             outline_after_terrain,
             outline_high_contrast: self.settings.file.bool("highContrastBlockOutline"),
-            pvp: self.settings.extras.pvp.frame(),
+            look: self.look_frame(),
             debug_lines: &debug_lines,
             debug_lines_on_top: &debug_lines_on_top,
             debug_crosshair: &debug_crosshair,
@@ -10709,7 +10706,7 @@ impl Game<'_> {
                     if self.screen == Screen::Inventory
                         && d != 0.0
                         && !bundle
-                        && !self.tweak_scroll(d, self.inventory_target().0)
+                        && !self.container_scroll(d)
                     {
                         self.station_scroll(d);
                     }
@@ -10957,7 +10954,7 @@ impl Game<'_> {
                         return Ok(());
                     }
                     if pressed
-                        && (self.sort_mouse_press(button)
+                        && (self.container_mouse_press(button)
                             || self.hud_editor_key_press(&horizon_client::keybinds::mouse_name(
                                 button,
                             )))
@@ -11499,7 +11496,7 @@ impl Game<'_> {
                         }
                     }
                     self.extras_frame(elapsed);
-                    self.extras_retry()?;
+                    self.reconnect_when_due()?;
                     self.apply_mouse_look();
                     self.pad_look(elapsed.as_secs_f32());
                     self.advance_flight();
@@ -11610,7 +11607,7 @@ impl Game<'_> {
                             self.settings.simulation_distance,
                             self.settings.entity_distance,
                         );
-                        server.set_legacy_rules(self.settings.extras.pvp.combat.rules);
+                        server.set_legacy_rules(self.pvp_legacy_rules());
                     }
                     self.clock.end_frame(self.pause);
                     let mut consumed = false;
@@ -12210,7 +12207,7 @@ impl<'a> Game<'a> {
             persist: Default::default(),
             entity_attachments: Default::default(),
             remote: None,
-            realm_session: false,
+            last_server: Default::default(),
             studio_replay: None,
             studio_freecam: Default::default(),
             studio_timeline: Default::default(),

crates/horizon-client/src/game/chat.rs

@@ -1278,7 +1278,7 @@ impl Game<'_> {
         let ctrl = self.has_control_down_with_quirk();
         let shift = self.has_shift_down();
         // PvP & HUD's chat search: Ctrl+F starts and stops it, Enter stops it (sends nothing).
-        if self.settings.extras.pvp.chat.search
+        if self.chat_look().search
             && match key {
                 KeyCode::KeyF => ctrl,
                 KeyCode::Enter | KeyCode::NumpadEnter => self.pvp.chat_search,
@@ -1487,7 +1487,7 @@ impl Game<'_> {
             cursor.1 as f64,
         );
         // PvP & HUD's copy on click: a message where the click has nothing else to do.
-        if self.settings.extras.pvp.chat.copy
+        if self.chat_look().copy
             && !self.has_shift_down()
             && style.as_ref().is_none_or(|s| s.click.is_none())
             && let Some(message) =
@@ -1665,8 +1665,8 @@ impl Game<'_> {
     /// Chat lines over the HUD (focused while the chat screen is open).
     pub(super) fn draw_chat(&mut self, batch: &mut HudBatch) {
         let focused = self.screen == Screen::Chat;
-        let options = self.settings.extras.pvp.chat;
-        self.ui.chat.set_qol(&self.gui.atlas, options.qol());
+        let options = self.chat_look();
+        self.ui.chat.set_qol(&self.gui.atlas, self.chat_qol());
         // A search ends with its option; a chat closed some other way ends it in keep_chat_draft.
         if self.pvp.chat_search && self.ui.chat_screen.is_none() {
             // The chat went without closing (leaving the world): nothing to give back.

crates/horizon-client/src/game/dedicated.rs

@@ -1249,7 +1249,7 @@ impl Game<'_> {
         self.sync_ops(&lists);
         let anticheat = load_anticheat();
         let chat_filter = load_chat_filter();
-        self.settings.extras.pvp.combat.rules = load_combat();
+        self.set_pvp_legacy_rules(load_combat());
         // Horizon's far ring (docs/hosting.md): server.toml's `max_view_distance`.
         let far = props
             .raw

crates/horizon-client/src/game/extras.rs

@@ -2,15 +2,21 @@
 //! (`native_minimap`: its tiles, image and HUD) and zoom (`native_zoom`) on the camera; clicks
 //! and frame times for mods (`native_clicks`, `native_frame_rate`).
 //! Each hook does nothing while its extra is off and no mod uses it.
+//!
+//! Each Horizon extra's game glue is a child module here, so it leaves the engine in one move
+//! (docs/layers.md, plan M5): `reconnect` (auto-reconnect), `pvp` (the PvP & HUD options),
+//! `mouse_tweaks` and `sorting` (the inventory extras).
+pub(in crate::game) mod mouse_tweaks;
+pub(in crate::game) mod pvp;
+mod reconnect;
+mod sorting;
+
 use super::{Dim, Game, Screen, native_hooks::NativeMinimap};
 use horizon_client::{
     extras::{Corner, Cps, FpsCounter, fov_target},
     extras_hud::{self, Corners},
     hud::{HudBatch, MINIMAP_SPRITE},
     minimap::{self, Layer, Minimap, View},
-    multiplayer,
-    reconnect::{Retry, Tracker},
-    title::Mode,
 };
 use std::time::Duration;
 use winit::event::MouseButton;
@@ -24,8 +30,6 @@ pub(super) struct ExtrasState {
     minimap: Minimap,
     /// The dimension the minimap's tiles belong to.
     minimap_dim: Option<Dim>,
-    /// Auto-reconnect's attempts at the current server.
-    reconnect: Tracker,
 }
 /// CPU time the minimap's tiles may take per frame.
 const MINIMAP_BUDGET: Duration = Duration::from_micros(300);
@@ -57,6 +61,7 @@ impl Game<'_> {
         if !playing {
             self.extras.mouse = [false; 2];
         }
+        self.sync_reconnect_setting();
         self.update_minimap();
         // For mods (`render.frame-stats`, `native_frame_rate`).
         let now = self.extras_now();
@@ -78,74 +83,6 @@ impl Game<'_> {
         let cps = (l.per_second(now) as u32, r.per_second(now) as u32);
         (cps, self.extras.mouse)
     }
-    /// Auto-reconnect: a connection to `address` as `name` starts.
-    pub(super) fn extras_connecting(&mut self, address: &str, name: &str, lan: bool) {
-        self.extras.reconnect.connecting(address, name, lan);
-    }
-    /// The server this game connected to last.
-    pub(super) fn server_address(&self) -> Option<&str> {
-        self.extras.reconnect.address()
-    }
-    /// The server this game connected to last was found on the local network.
-    pub(super) fn server_is_lan(&self) -> bool {
-        self.extras.reconnect.lan()
-    }
-    /// Auto-reconnect: the server let the player in.
-    pub(super) fn extras_joined(&mut self) {
-        self.extras.reconnect.joined(std::time::Instant::now());
-    }
-    /// Auto-reconnect: the player left the server on purpose.
-    pub(super) fn extras_left(&mut self) {
-        self.extras.reconnect.reset();
-    }
-    /// Auto-reconnect's next attempt after a disconnect, when it is on and
-    /// the reason allows one.
-    pub(super) fn reconnect_after(
-        &mut self,
-        reason: &str,
-        key: Option<&str>,
-        from_server: bool,
-    ) -> Option<Retry> {
-        if !self.settings.extras.auto_reconnect {
-            self.extras.reconnect.reset();
-            return None;
-        }
-        let now = std::time::Instant::now();
-        self.extras.reconnect.ended(reason, key, from_server, now)
-    }
-    /// Show the attempt's countdown on the Disconnected screen.
-    pub(super) fn offer_reconnect(&mut self, retry: Option<Retry>) {
-        let Some(retry) = retry else {
-            return;
-        };
-        if let Some(title) = self.title.as_mut()
-            && let Mode::Multiplayer(multiplayer::Screen::Disconnected { retry: slot, .. }) =
-                &mut title.mode
-        {
-            log::info!(
-                "Horizon: reconnecting to {} in {} s",
-                horizon_client::net::shown_address(&retry.address),
-                retry.seconds_left(std::time::Instant::now())
-            );
-            *slot = Some(retry);
-        }
-    }
-    /// Auto-reconnect: connect again once the countdown is over. An
-    /// online-mode server gets the signed-in account again: `connect_server`
-    /// takes it from `auth::current()`, held in memory for the whole run
-    /// (the launcher's session file is gone after the first read).
-    pub(super) fn extras_retry(&mut self) -> horizon_client::Result<()> {
-        if let Some(retry) = self.title.as_mut().and_then(|t| t.due_retry()) {
-            self.connect_server_with_options(
-                &retry.address,
-                &retry.name,
-                None,
-                retry.lan,
-                self.realm_session,
-            )?;
-        }
-        Ok(())
-    }
     /// The minimap a mod shows (`native_minimap`): its corner, its side
     /// in GUI pixels and its view of the player.
     fn minimap_shown(&self) -> Option<(Corner, f32, View)> {
@@ -284,7 +221,7 @@ impl Game<'_> {
     /// (`Hud.extractEffects`: beneficial at y 1, harmful at y 26).
     fn effect_rows_height(&self) -> f32 {
         let effects = &self.potions.effects.list;
-        if effects.is_empty() || self.screen != Screen::Playing || self.pvp_effects_shown() {
+        if effects.is_empty() || self.screen != Screen::Playing || self.effect_icons_hidden() {
             return 0.0;
         }
         let harmful = effects.iter().any(|e| {

crates/horizon-client/src/game/extras/mouse_tweaks.rs

@@ -17,26 +17,12 @@
 //!   other side. Down over a result slot takes one craft or the whole furnace
 //!   output to the inventory; nothing ever goes into a result slot.
 //!
-//! Sorting draws a small button by a menu's storage slots and one by the
-//! inventory's (an optional key sorts the part under the cursor); the
-//! clicks come from `inv_sort::plan`.
-use super::{Creative, Game, Screen};
-use horizon_client::{
-    containers::BlockEntity,
-    hud::{HudBatch, rgba},
-    inv_sort,
-    items::ItemStack,
-    keybinds,
-    menu::Input,
-    stations::hover_name,
-};
-use winit::{event::MouseButton, keyboard::KeyCode};
-
-/// A sort button's side in GUI pixels.
-const SORT_BUTTON: f32 = 9.0;
+//! Sorting, which clicks through `tweak_click` too, is in `sorting.rs`.
+use crate::game::{Creative, Game, Screen};
+use horizon_client::{containers::BlockEntity, items::ItemStack, menu::Input};
 
 #[derive(Default)]
-pub(super) struct Tweaks {
+pub(in crate::game) struct Tweaks {
     drag: Option<Drag>,
     /// Wheel steps not yet acted on (a trackpad scrolls in fractions).
     wheel: f32,
@@ -44,7 +30,7 @@ pub(super) struct Tweaks {
 /// A server's menu the tweaks run in: their clicks are vanilla's in these,
 /// and the menu engine knows which slot takes what. Not the menus whose slots
 /// cost or trigger something (anvils, enchanting, merchants, beacons, crafters).
-pub(super) fn tweak_menu(name: &str) -> bool {
+pub(in crate::game) fn tweak_menu(name: &str) -> bool {
     name == "inventory"
         || name.starts_with("minecraft:generic_9x")
         || matches!(
@@ -72,7 +58,7 @@ struct Drag {
 
 impl Game<'_> {
     /// The open screen is one the tweaks run in, with the extra on.
-    pub(super) fn tweaks_on(&self) -> bool {
+    pub(in crate::game) fn tweaks_on(&self) -> bool {
         if !self.settings.extras.mouse_tweaks
             || self.screen != Screen::Inventory
             || self.station.is_some()
@@ -87,7 +73,7 @@ impl Game<'_> {
         }
     }
     /// One ordinary click on a game slot. False when nothing took it.
-    pub(super) fn tweak_click(&mut self, slot: usize, button: i32, input: Input) -> bool {
+    pub(in crate::game) fn tweak_click(&mut self, slot: usize, button: i32, input: Input) -> bool {
         if self.remote.is_some() {
             return self.remote_menu_ops(&[(Some(slot), button, input)]);
         }
@@ -103,7 +89,7 @@ impl Game<'_> {
     /// drag (`QUICK_CRAFT`) and not a click: a server that has the hand empty
     /// (the stack it was to come from just burned as fuel) ignores a drag, but
     /// a click would pick up what's in `slot`.
-    fn tweak_put(&mut self, slot: usize, right: bool) -> bool {
+    pub(in crate::game) fn tweak_put(&mut self, slot: usize, right: bool) -> bool {
         let kind = i32::from(right) << 2;
         let ops = [
             (None, kind, Input::QuickCraft),
@@ -123,7 +109,12 @@ impl Game<'_> {
     }
     /// A press on `slot`: true when the tweaks took it (a right-drag
     /// placing), else vanilla's press runs and the tweaks watch the drag.
-    pub(super) fn tweak_press(&mut self, slot: Option<usize>, right: bool, shift: bool) -> bool {
+    pub(in crate::game) fn tweak_press(
+        &mut self,
+        slot: Option<usize>,
+        right: bool,
+        shift: bool,
+    ) -> bool {
         self.tweaks.drag = None;
         let Some(slot) = slot.filter(|&s| s != 200 && s < Creative::DISPLAY) else {
             return false;
@@ -174,7 +165,7 @@ impl Game<'_> {
     }
     /// The cursor moved while a button is held: true when the tweaks own
     /// the drag (vanilla's quick craft drag doesn't grow).
-    pub(super) fn tweak_drag_move(&mut self, slot: Option<usize>) -> bool {
+    pub(in crate::game) fn tweak_drag_move(&mut self, slot: Option<usize>) -> bool {
         let Some(mut drag) = self.tweaks.drag.take() else {
             return false;
         };
@@ -222,11 +213,11 @@ impl Game<'_> {
         owned
     }
     /// The button went up: the drag ends.
-    pub(super) fn tweak_release(&mut self) {
+    pub(in crate::game) fn tweak_release(&mut self) {
         self.tweaks.drag = None;
     }
     /// The wheel over an inventory screen: true when the tweaks used it.
-    pub(super) fn tweak_scroll(&mut self, delta: f32, slot: Option<usize>) -> bool {
+    pub(in crate::game) fn tweak_scroll(&mut self, delta: f32, slot: Option<usize>) -> bool {
         if !self.settings.extras.mouse_tweaks_wheel || !self.tweaks_on() || self.carried.is_some() {
             return false;
         }
@@ -256,7 +247,7 @@ impl Game<'_> {
         result
     }
     /// `slot` takes one more of `stack`, by the open menu's rules.
-    fn tweak_takes_one(&mut self, slot: usize, stack: &ItemStack) -> bool {
+    pub(in crate::game) fn tweak_takes_one(&mut self, slot: usize, stack: &ItemStack) -> bool {
         let mut takes = false;
         self.menu_session(|menu, env, to_menu| {
             takes = to_menu(slot).is_some_and(|i| menu.takes_one(env, i, stack));
@@ -266,7 +257,7 @@ impl Game<'_> {
     }
     /// Where vanilla's quick move would put `slot`'s items, tried on a copy
     /// of the menu that's dropped (`Some(false)` keeps nothing).
-    fn tweak_landing(&mut self, slot: usize) -> Vec<usize> {
+    pub(in crate::game) fn tweak_landing(&mut self, slot: usize) -> Vec<usize> {
         let slots = self.slots();
         let mut landing = Vec::new();
         self.menu_session(|menu, env, to_menu| {
@@ -356,144 +347,6 @@ impl Game<'_> {
     }
 }
 
-impl Game<'_> {
-    /// The sort buttons of the open screen, with the extra on: their
-    /// corner (from the screen's) and the slots each sorts. Any menu screen
-    /// gets them, by its slots' roles (`native_slot_roles`): one by the top
-    /// right of its storage slots (a chest's title line) when it has some,
-    /// one by the main inventory's (the "Inventory" label's line).
-    fn sort_buttons(&self) -> Vec<((f32, f32), Vec<usize>)> {
-        use super::NativeSlotRole as Role;
-        if !self.settings.extras.sort {
-            return Vec::new();
-        }
-        let roles = self.native_slot_roles();
-        let of = |role| -> Vec<usize> {
-            roles
-                .iter()
-                .filter(|(_, r)| *r == role)
-                .map(|(s, _)| *s)
-                .collect()
-        };
-        // Over the section's last column: (160, 5) over a chest's slots.
-        let right = |slots: &[usize]| {
-            slots
-                .iter()
-                .map(|&s| self.slot_position(s).0 + 8.0)
-                .fold(f32::MIN, f32::max)
-        };
-        let mut buttons = Vec::new();
-        let storage = of(Role::Storage);
-        if !storage.is_empty() {
-            let top = storage
-                .iter()
-                .map(|&s| self.slot_position(s).1 - 13.0)
-                .fold(f32::MAX, f32::min);
-            buttons.push(((right(&storage), top), storage));
-        }
-        // On the "Inventory" label's line (`inventoryLabelY`, height - 94, 12
-        // above the first row): a mod's screen places its inventory itself.
-        let main = of(Role::Inventory);
-        if !main.is_empty() {
-            let y = self
-                .native_screen_inventory_y()
-                .map_or(self.screen_height() - 95.0, |y| y - 13.0);
-            buttons.push(((right(&main), y), main));
-        }
-        buttons
-    }
-    /// The sort buttons: a bordered square with three bars, lighter under
-    /// the cursor.
-    pub(super) fn draw_sort_buttons(&self, batch: &mut HudBatch, ox: f32, oy: f32) {
-        let atlas = &self.gui.atlas;
-        for ((x, y), _) in self.sort_buttons() {
-            let (x, y) = (ox + x, oy + y);
-            let (cx, cy) = self.cursor;
-            let hovered = cx >= x && cx < x + SORT_BUTTON && cy >= y && cy < y + SORT_BUTTON;
-            let face = if hovered {
-                rgba(220, 220, 220, 255)
-            } else {
-                rgba(160, 160, 160, 255)
-            };
-            batch.fill(atlas, x, y, SORT_BUTTON, SORT_BUTTON, rgba(55, 55, 55, 255));
-            batch.fill(
-                atlas,
-                x + 1.0,
-                y + 1.0,
-                SORT_BUTTON - 2.0,
-                SORT_BUTTON - 2.0,
-                face,
-            );
-            for (i, w) in [5.0, 4.0, 3.0].into_iter().enumerate() {
-                let by = y + 2.0 + 2.0 * i as f32;
-                batch.fill(atlas, x + 2.0, by, w, 1.0, rgba(55, 55, 55, 255));
-            }
-        }
-    }
-    /// A left press on a sort button sorts its slots (true).
-    pub(super) fn sort_press(&mut self) -> bool {
-        let Some(r) = self.renderer.as_ref() else {
-            return false;
-        };
-        let batch = HudBatch::new([r.config.width, r.config.height]);
-        let (ox, oy) = self.inventory_origin(&batch);
-        let (cx, cy) = self.cursor;
-        let hit = self.sort_buttons().into_iter().find(|((x, y), _)| {
-            let (x, y) = (ox + x, oy + y);
-            cx >= x && cx < x + SORT_BUTTON && cy >= y && cy < y + SORT_BUTTON
-        });
-        let Some((_, slots)) = hit else {
-            return false;
-        };
-        self.sort_slots(&slots);
-        true
-    }
-    /// The sort key: sorts the part under the cursor (the container when
-    /// the cursor is over no slot).
-    pub(super) fn sort_key_press(&mut self, key: KeyCode) -> bool {
-        keybinds::key_name(key).is_some_and(|name| self.sort_input(name))
-    }
-    pub(super) fn sort_mouse_press(&mut self, button: MouseButton) -> bool {
-        self.sort_input(&keybinds::mouse_name(button))
-    }
-    fn sort_input(&mut self, name: &str) -> bool {
-        let e = &self.settings.extras;
-        if !e.sort || e.sort_key != name || self.recipe_search_focused() {
-            return false;
-        }
-        let buttons = self.sort_buttons();
-        let hovered = self.inventory_target().0;
-        let slots = buttons
-            .iter()
-            .find(|(_, slots)| hovered.is_some_and(|h| slots.contains(&h)))
-            .or(buttons.first())
-            .map(|(_, slots)| slots.clone());
-        let Some(slots) = slots else {
-            return false;
-        };
-        self.sort_slots(&slots);
-        true
-    }
-    /// Sorts `slots` with ordinary left clicks (needs an empty hand).
-    fn sort_slots(&mut self, slots: &[usize]) {
-        if self.carried.is_some() {
-            return;
-        }
-        let views: Vec<Option<ItemStack>> = slots.iter().map(|&s| self.slot_view(s)).collect();
-        let clicks = {
-            let rank = |s: &ItemStack| {
-                let order = self.creative_screen.order_of(s).unwrap_or(usize::MAX);
-                (order, hover_name(&self.pack.names, s))
-            };
-            let max = |s: &ItemStack| self.max_stack(s);
-            inv_sort::plan(&views, &rank, &max)
-        };
-        for i in clicks {
-            self.tweak_click(slots[i], 0, Input::Pickup);
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::tweak_menu;

crates/horizon-client/src/game/extras/pvp.rs

@@ -1,6 +1,6 @@
 //! The PvP & HUD page's options in the game (`horizon_client::pvp`, `docs/pvp.md`). Each
 //! does nothing while it is off.
-use super::{Dim, Game};
+use crate::game::Game;
 use horizon_client::{
     extras::Corner,
     extras_hud::Corners,
@@ -14,7 +14,7 @@ use std::sync::Arc;
 use winit::event::MouseButton;
 
 #[derive(Default)]
-pub(super) struct PvpState {
+pub(in crate::game) struct PvpState {
     crosshair: CrosshairCache,
     /// Each armour slot's item, damage and maximum damage, and whether durability is in percent.
     armour: Widget<([Option<(Arc<str>, u32, u32)>; 4], bool)>,
@@ -41,13 +41,13 @@ pub(super) struct PvpState {
     speed: pvp_hud::Speed,
     speed_shown: Widget<u32>,
     /// Each widget drawn last frame and its box on screen, for the HUD editor.
-    pub(super) boxes: Vec<(pvp_hud::WidgetId, [f32; 4])>,
+    pub(in crate::game) boxes: Vec<(pvp_hud::WidgetId, [f32; 4])>,
     /// The HUD editor, while it is open.
-    pub(super) editor: Option<super::hud_editor::HudEditor>,
+    pub(in crate::game) editor: Option<crate::game::hud_editor::HudEditor>,
     /// The open chat's box holds a chat search's query (Ctrl+F).
-    pub(super) chat_search: bool,
+    pub(in crate::game) chat_search: bool,
     /// What the chat box held when the search borrowed it.
-    pub(super) chat_search_aside: String,
+    pub(in crate::game) chat_search_aside: String,
 }
 /// `GuiGraphicsExtractor`'s grey for a detail line (an effect's time left).
 const DETAIL: u32 = 0xFF7F_7F7F;
@@ -78,13 +78,13 @@ const ARROWS: [&str; 3] = [
 
 impl Game<'_> {
     /// Whether the custom crosshair replaces vanilla's sprite.
-    pub(super) fn custom_crosshair(&self) -> bool {
+    pub(in crate::game) fn custom_crosshair(&self) -> bool {
         self.settings.extras.pvp.crosshair.custom
     }
     /// The custom crosshair, centred where vanilla's 15x15 sprite is (`Hud.extractCrosshair`):
     /// its outline in black, then the shape, inverting what is under it when its colour is
     /// `Inverted`. The runs are cached, so a frame only adds their quads.
-    pub(super) fn draw_custom_crosshair(&mut self, batch: &mut HudBatch, w: i32, h: i32) {
+    pub(in crate::game) fn draw_custom_crosshair(&mut self, batch: &mut HudBatch, w: i32, h: i32) {
         let mut c = self.settings.extras.pvp.crosshair;
         if let Some(hover) = c.hover
             && self.crosshair_living() == Some(true)
@@ -114,7 +114,7 @@ impl Game<'_> {
     /// the outline's edges come from) as translucent faces drawn after translucent terrain,
     /// pushed out a little so they don't fight the block's own faces. Only while the outline
     /// shows (`outline` is its edges).
-    pub(super) fn outline_fill(
+    pub(in crate::game) fn outline_fill(
         &self,
         outline: &[[f64; 6]],
         camera: glam::DVec3,
@@ -176,42 +176,33 @@ impl Game<'_> {
             }
         }
     }
-    /// Once per frame: the options that live outside the game's state.
-    pub(super) fn pvp_frame(&mut self) {
+    /// Once per frame: the options that live outside the game's state, and the look the engine
+    /// draws with (`game/look.rs`), the only way it reads them.
+    pub(in crate::game) fn pvp_frame(&mut self) {
         let tweaks = self.settings.extras.pvp.tweaks;
         horizon_client::enchant::set_numeric_levels(tweaks.numeric_enchants);
+        horizon_hooks::look::update(|look| self.settings.extras.pvp.apply(look));
     }
-    /// Whether this window may draw PvP & HUD's own time and weather: only a client of a server
-    /// (single player's included) draws them, never the server that ticks the world.
-    fn own_view(&self) -> bool {
-        self.remote.is_some() && self.dim == Dim::Overworld
+    /// Legacy rules: the hits a server resolves follow 1.8.9 (`legacy_rules.rs`).
+    pub(in crate::game) fn pvp_legacy_rules(&self) -> bool {
+        self.settings.extras.pvp.combat.rules
     }
-    /// The day time the frame draws (sky, sun, moon, the sky's light): PvP & HUD's time of day,
-    /// else the world's. The world's own `day_time` and everything that plays by it stay.
-    pub(super) fn view_day_time(&self) -> i64 {
-        let fixed = self.settings.extras.pvp.tweaks.time;
-        horizon_client::pvp::view_day_time(self.world.day_time, fixed.filter(|_| self.own_view()))
-    }
-    /// The rain and thunder levels the frame draws (rain, the sky's colour and light, fog): PvP &
-    /// HUD's weather, else the world's. Gameplay (riptide, mobs, crops) keeps the world's.
-    pub(super) fn view_weather(&self, partial: f32) -> (f32, f32) {
-        match self.settings.extras.pvp.tweaks.weather {
-            Some(w) if self.own_view() && self.can_have_weather() => w.levels(),
-            _ => self.weather_levels(partial),
-        }
+    /// The server's legacy rules, from server.toml or the window's options.
+    pub(in crate::game) fn set_pvp_legacy_rules(&mut self, on: bool) {
+        self.settings.extras.pvp.combat.rules = on;
     }
     /// This player attacked entity `id`, `distance` from the eyes to where the crosshair's
     /// ray met its box (the combo counter waits for the server's report; the reach widget
     /// shows the distance).
-    pub(super) fn pvp_attacked(&mut self, id: i32, distance: f64) {
+    pub(in crate::game) fn pvp_attacked(&mut self, id: i32, distance: f64) {
         let now = self.started.elapsed().as_secs_f64();
         self.pvp.combo.attacked(id, now);
         self.pvp.reach.hit(distance, now);
     }
     /// A mouse press, counted for clicks per second while playing with a widget that shows them.
-    pub(super) fn pvp_click(&mut self, button: MouseButton) {
+    pub(in crate::game) fn pvp_click(&mut self, button: MouseButton) {
         let hud = &self.settings.extras.pvp.hud;
-        if !(hud.cps || hud.keys) || self.screen != super::Screen::Playing {
+        if !(hud.cps || hud.keys) || self.screen != crate::game::Screen::Playing {
             return;
         }
         let i = match button {
@@ -232,7 +223,7 @@ impl Game<'_> {
     }
     /// The server reports entity `id` hurt; `own` when it is this player,
     /// `by_me` whether this player was the damage's direct entity (if named).
-    pub(super) fn pvp_hurt(&mut self, id: i32, own: bool, by_me: Option<bool>) {
+    pub(in crate::game) fn pvp_hurt(&mut self, id: i32, own: bool, by_me: Option<bool>) {
         if own {
             self.pvp.combo.broken();
         } else {
@@ -240,13 +231,9 @@ impl Game<'_> {
             self.pvp.combo.hurt(id, by_me, now);
         }
     }
-    /// Whether the effects widget replaces vanilla's effect icons (`Hud.extractEffects`).
-    pub(super) fn pvp_effects_shown(&self) -> bool {
-        self.settings.extras.pvp.hud.effects
-    }
     /// The HUD widgets that are on, after the minimap and before mods' boxes. Each rebuilds its
     /// lines only when what it shows changed.
-    pub(super) fn draw_pvp_hud(&mut self, batch: &mut HudBatch, corners: &mut Corners) {
+    pub(in crate::game) fn draw_pvp_hud(&mut self, batch: &mut HudBatch, corners: &mut Corners) {
         let hud = self.settings.extras.pvp.hud;
         if self.player.is_none() || !hud.any() {
             // The editor frames only what was drawn.
@@ -267,8 +254,8 @@ impl Game<'_> {
             let at = [p.position.x, p.position.y, p.position.z].map(|v| v.floor() as i32);
             (at, pvp_hud::facing(self.yaw))
         });
-        // The address is copied only when it changed (`server_address` borrows the whole game).
-        let server = self.server_address().filter(|_| multiplayer);
+        // The address is copied only when it changed.
+        let server = self.last_server.address().filter(|_| multiplayer);
         let server = (hud.server && self.pvp.server.next.as_deref() != server)
             .then(|| server.map(str::to_owned));
         let now = self.started.elapsed().as_secs_f64();
@@ -691,7 +678,7 @@ impl Game<'_> {
             false => s.item == held.item,
         };
         let slots = self.inventory.iter().map(Option::as_ref).enumerate();
-        let offhand = std::iter::once((super::shield::OFFHAND_SLOT, self.offhand.as_ref()));
+        let offhand = std::iter::once((crate::game::shield::OFFHAND_SLOT, self.offhand.as_ref()));
         let mut found = slots
             .chain(offhand)
             .filter_map(|(i, s)| Some((i, s?)))

crates/horizon-client/src/game/extras/reconnect.rs

@@ -0,0 +1,11 @@
+//! Auto-reconnect (`autoReconnect`, docs/extras.md) runs on the engine's connection hooks
+//! (`horizon_client::reconnect::HOOKS`, registered in `entry.rs`). Its setting still lives in
+//! the engine's extras, so it is handed over here; it leaves with the extras page (plan M5).
+use crate::game::Game;
+
+impl Game<'_> {
+    /// Once per frame: the `autoReconnect` setting, for the hook to read when a connection ends.
+    pub(in crate::game) fn sync_reconnect_setting(&self) {
+        horizon_client::reconnect::HOOKS.set_enabled(self.settings.extras.auto_reconnect);
+    }
+}

crates/horizon-client/src/game/extras/sorting.rs

@@ -0,0 +1,155 @@
+//! Sorting (`sort`, `sortKey`; #332, `docs/extras.md`), off by default: a small button by a
+//! menu's storage slots and one by the inventory's (an optional key sorts the part under the
+//! cursor). The clicks come from `inv_sort::plan` and go through the Mouse Tweaks' ordinary slot
+//! clicks (`mouse_tweaks.rs`), so they work wherever vanilla's do.
+use crate::game::Game;
+use horizon_client::{
+    hud::{HudBatch, rgba},
+    inv_sort,
+    items::ItemStack,
+    keybinds,
+    menu::Input,
+    stations::hover_name,
+};
+use winit::{event::MouseButton, keyboard::KeyCode};
+
+/// A sort button's side in GUI pixels.
+const SORT_BUTTON: f32 = 9.0;
+
+impl Game<'_> {
+    /// The sort buttons of the open screen, with the extra on: their
+    /// corner (from the screen's) and the slots each sorts. Any menu screen
+    /// gets them, by its slots' roles (`native_slot_roles`): one by the top
+    /// right of its storage slots (a chest's title line) when it has some,
+    /// one by the main inventory's (the "Inventory" label's line).
+    fn sort_buttons(&self) -> Vec<((f32, f32), Vec<usize>)> {
+        use crate::game::NativeSlotRole as Role;
+        if !self.settings.extras.sort {
+            return Vec::new();
+        }
+        let roles = self.native_slot_roles();
+        let of = |role| -> Vec<usize> {
+            roles
+                .iter()
+                .filter(|(_, r)| *r == role)
+                .map(|(s, _)| *s)
+                .collect()
+        };
+        // Over the section's last column: (160, 5) over a chest's slots.
+        let right = |slots: &[usize]| {
+            slots
+                .iter()
+                .map(|&s| self.slot_position(s).0 + 8.0)
+                .fold(f32::MIN, f32::max)
+        };
+        let mut buttons = Vec::new();
+        let storage = of(Role::Storage);
+        if !storage.is_empty() {
+            let top = storage
+                .iter()
+                .map(|&s| self.slot_position(s).1 - 13.0)
+                .fold(f32::MAX, f32::min);
+            buttons.push(((right(&storage), top), storage));
+        }
+        // On the "Inventory" label's line (`inventoryLabelY`, height - 94, 12
+        // above the first row): a mod's screen places its inventory itself.
+        let main = of(Role::Inventory);
+        if !main.is_empty() {
+            let y = self
+                .native_screen_inventory_y()
+                .map_or(self.screen_height() - 95.0, |y| y - 13.0);
+            buttons.push(((right(&main), y), main));
+        }
+        buttons
+    }
+    /// The sort buttons: a bordered square with three bars, lighter under
+    /// the cursor.
+    pub(in crate::game) fn draw_sort_buttons(&self, batch: &mut HudBatch, ox: f32, oy: f32) {
+        let atlas = &self.gui.atlas;
+        for ((x, y), _) in self.sort_buttons() {
+            let (x, y) = (ox + x, oy + y);
+            let (cx, cy) = self.cursor;
+            let hovered = cx >= x && cx < x + SORT_BUTTON && cy >= y && cy < y + SORT_BUTTON;
+            let face = if hovered {
+                rgba(220, 220, 220, 255)
+            } else {
+                rgba(160, 160, 160, 255)
+            };
+            batch.fill(atlas, x, y, SORT_BUTTON, SORT_BUTTON, rgba(55, 55, 55, 255));
+            batch.fill(
+                atlas,
+                x + 1.0,
+                y + 1.0,
+                SORT_BUTTON - 2.0,
+                SORT_BUTTON - 2.0,
+                face,
+            );
+            for (i, w) in [5.0, 4.0, 3.0].into_iter().enumerate() {
+                let by = y + 2.0 + 2.0 * i as f32;
+                batch.fill(atlas, x + 2.0, by, w, 1.0, rgba(55, 55, 55, 255));
+            }
+        }
+    }
+    /// A left press on a sort button sorts its slots (true).
+    pub(in crate::game) fn sort_press(&mut self) -> bool {
+        let Some(r) = self.renderer.as_ref() else {
+            return false;
+        };
+        let batch = HudBatch::new([r.config.width, r.config.height]);
+        let (ox, oy) = self.inventory_origin(&batch);
+        let (cx, cy) = self.cursor;
+        let hit = self.sort_buttons().into_iter().find(|((x, y), _)| {
+            let (x, y) = (ox + x, oy + y);
+            cx >= x && cx < x + SORT_BUTTON && cy >= y && cy < y + SORT_BUTTON
+        });
+        let Some((_, slots)) = hit else {
+            return false;
+        };
+        self.sort_slots(&slots);
+        true
+    }
+    /// The sort key: sorts the part under the cursor (the container when
+    /// the cursor is over no slot).
+    pub(in crate::game) fn sort_key_press(&mut self, key: KeyCode) -> bool {
+        keybinds::key_name(key).is_some_and(|name| self.sort_input(name))
+    }
+    pub(in crate::game) fn sort_mouse_press(&mut self, button: MouseButton) -> bool {
+        self.sort_input(&keybinds::mouse_name(button))
+    }
+    fn sort_input(&mut self, name: &str) -> bool {
+        let e = &self.settings.extras;
+        if !e.sort || e.sort_key != name || self.recipe_search_focused() {
+            return false;
+        }
+        let buttons = self.sort_buttons();
+        let hovered = self.inventory_target().0;
+        let slots = buttons
+            .iter()
+            .find(|(_, slots)| hovered.is_some_and(|h| slots.contains(&h)))
+            .or(buttons.first())
+            .map(|(_, slots)| slots.clone());
+        let Some(slots) = slots else {
+            return false;
+        };
+        self.sort_slots(&slots);
+        true
+    }
+    /// Sorts `slots` with ordinary left clicks (needs an empty hand).
+    fn sort_slots(&mut self, slots: &[usize]) {
+        if self.carried.is_some() {
+            return;
+        }
+        let views: Vec<Option<ItemStack>> = slots.iter().map(|&s| self.slot_view(s)).collect();
+        let clicks = {
+            let rank = |s: &ItemStack| {
+                let order = self.creative_screen.order_of(s).unwrap_or(usize::MAX);
+                (order, hover_name(&self.pack.names, s))
+            };
+            let max = |s: &ItemStack| self.max_stack(s);
+            inv_sort::plan(&views, &rank, &max)
+        };
+        for i in clicks {
+            self.tweak_click(slots[i], 0, Input::Pickup);
+        }
+    }
+}

crates/horizon-client/src/game/frame_geometry.rs

@@ -238,7 +238,7 @@ impl Game<'_> {
         let off_hand_empty = items[1].is_none();
         // Combat feel Legacy: a sword is held up while use is held, as 1.8.9's block looked.
         // Only the picture changes: the clicks and what they send stay 26.3's.
-        let legacy_block = self.settings.extras.pvp.combat.legacy
+        let legacy_block = self.legacy_pose()
             && self.right
             && self.screen == Screen::Playing
             && items[0]
@@ -426,7 +426,7 @@ impl Game<'_> {
             let mut m = to_world
                 * horizon_client::first_person::item_pose(left, inverse_height, attack, pose);
             // PvP & HUD's shield size (100% is vanilla's), toward the hand holding it.
-            let shield_size = self.settings.extras.pvp.tweaks.shield_size;
+            let shield_size = self.shield_size();
             if shield_size != 100 && &*stack.item == "minecraft:shield" {
                 m *= glam::Mat4::from_scale(glam::Vec3::splat(f32::from(shield_size) / 100.0));
             }
@@ -449,7 +449,7 @@ impl Game<'_> {
             };
             let state = self.resolve_item_in_hand(&stack, context, Some(&owner), seed, cit_hand);
             // Combat feel Legacy: 1.8.9's pose for a flat item drawn with vanilla's display.
-            if self.settings.extras.pvp.combat.legacy
+            if self.legacy_pose()
                 && !state.layers.is_empty()
                 && state
                     .layers

crates/horizon-client/src/game/hand.rs

@@ -568,7 +568,7 @@ impl Game<'_> {
             self.hands_busy(),
             self.hand_strength.swap_scale(1.0, speed),
             changed,
-            self.settings.extras.pvp.combat.legacy,
+            self.legacy_pose(),
         );
         for h in 0..2 {
             if replace[h] {

crates/horizon-client/src/game/integrated.rs

@@ -477,7 +477,7 @@ impl Game<'_> {
             .store(settings.entity_distance.to_bits(), Ordering::Relaxed);
         flags
             .legacy_rules
-            .store(settings.extras.pvp.combat.rules, Ordering::Relaxed);
+            .store(self.pvp_legacy_rules(), Ordering::Relaxed);
         let (ready_tx, ready) = channel();
         let (tasks, server_tasks) = channel();
         let server_flags = flags.clone();
@@ -1095,7 +1095,7 @@ impl Game<'_> {
         // IntegratedServer.getScaledTrackingDistance reads the option each time.
         self.settings.entity_distance =
             f32::from_bits(flags.entity_distance.load(Ordering::Relaxed));
-        self.settings.extras.pvp.combat.rules = flags.legacy_rules.load(Ordering::Relaxed);
+        self.set_pvp_legacy_rules(flags.legacy_rules.load(Ordering::Relaxed));
         let Some(host) = self.lan.as_mut() else {
             return;
         };

crates/horizon-client/src/game/inventory_input.rs

@@ -2,6 +2,9 @@
 //! drags, throws and the press/release of a slot click.
 use super::*;
 
+/// What crates above the engine get of these screens (`horizon_hooks::containers`).
+mod containers;
+
 /// Q throws the whole stack with Control down: the same modifier word the
 /// screens read (`has_control_down`), never a latched sprint toggle.
 pub(super) fn drop_whole_stack(modifiers: winit::keyboard::ModifiersState) -> bool {
@@ -161,7 +164,7 @@ impl Game<'_> {
             }
             return;
         }
-        if self.tweak_press(slot, right, shift) {
+        if self.tweak_press(slot, right, shift) || self.container_press(right) {
             return;
         }
         if let Some(slot) = slot
@@ -263,7 +266,9 @@ impl Game<'_> {
     }
     /// Mouse movement while a quick craft drag is running.
     pub(super) fn inventory_drag_move(&mut self) {
-        if self.tweaks_on() && self.tweak_drag_move(self.inventory_target().0) {
+        if self.tweaks_on() && self.tweak_drag_move(self.inventory_target().0)
+            || self.container_drag()
+        {
             return;
         }
         let Some((ty, slots)) = self.inv_drag.clone() else {
@@ -426,6 +431,7 @@ impl Game<'_> {
     pub(super) fn inventory_mouse_release(&mut self, right: bool) {
         use horizon_client::container_screen::{Release, Target};
         self.tweak_release();
+        self.container_release();
         let (slot, outside) = self.inventory_target();
         let dragged = self.inv_drag.as_ref().is_some_and(|(_, s)| !s.is_empty());
         let release = self.inv_clicks.release(

crates/horizon-client/src/game/inventory_input/containers.rs

@@ -0,0 +1,303 @@
+//! The engine's side of the container screen API (`horizon_hooks::containers`, docs/layers.md,
+//! "Container screens"): the open menu screen as a [`Container`] for the length of one hook call,
+//! and the input and drawing that reach the hooks. With no hook registered nothing here is built.
+use crate::game::{Game, NativeSlotRole, Screen};
+use horizon_client::{
+    extras_hud, hud::HudBatch, items::ItemStack, keybinds, menu::Input, stations::hover_name,
+};
+use horizon_hooks::{
+    containers::{Click, Container, Role, Slot, SlotId, Stack},
+    engine,
+};
+use winit::{event::MouseButton, keyboard::KeyCode};
+
+/// The open screen's menu, over the game for one call. `origin`: the panel's top left corner in
+/// GUI pixels.
+struct Open<'g, 'a> {
+    game: &'g mut Game<'a>,
+    origin: (f32, f32),
+}
+
+/// The same, read only: what drawing gets.
+struct View<'g, 'a> {
+    game: &'g Game<'a>,
+    origin: (f32, f32),
+}
+
+fn role(role: NativeSlotRole) -> Role {
+    match role {
+        NativeSlotRole::Hotbar => Role::Hotbar,
+        NativeSlotRole::Inventory => Role::Inventory,
+        NativeSlotRole::Storage => Role::Storage,
+        NativeSlotRole::CraftingGrid | NativeSlotRole::Input => Role::Input,
+        NativeSlotRole::Result => Role::Result,
+        NativeSlotRole::Equipment => Role::Equipment,
+    }
+}
+
+/// Stacks that merge (`same_item_same_components`) share a kind.
+fn kind(stack: &ItemStack) -> u64 {
+    use std::hash::{Hash, Hasher};
+    let mut h = std::collections::hash_map::DefaultHasher::new();
+    stack.item.hash(&mut h);
+    stack.damage.hash(&mut h);
+    format!("{:?}", stack.extra).hash(&mut h);
+    h.finish()
+}
+
+fn slot_id(slot: usize) -> SlotId {
+    SlotId(u32::try_from(slot).unwrap_or(u32::MAX))
+}
+
+fn game_slot(slot: SlotId) -> usize {
+    slot.0 as usize
+}
+
+impl<'a> Game<'a> {
+    /// The open menu's type: the server's, else the menu this window opened itself.
+    fn container_menu(&self) -> &str {
+        if let Some(menu) = self.remote_menu_type() {
+            return menu;
+        }
+        use horizon_client::containers::BlockEntity;
+        if self.mount_active() {
+            return "horizon:mount";
+        }
+        if self.station.is_some() {
+            return "horizon:station";
+        }
+        match self.container_kind() {
+            None if self.craft_size == 3 => "minecraft:crafting",
+            None => "inventory",
+            Some(BlockEntity::Chest(_)) => "minecraft:generic_9x3",
+            Some(BlockEntity::Furnace(_)) => "minecraft:furnace",
+            Some(_) => "horizon:block",
+        }
+    }
+    fn container_slots(&self) -> Vec<Slot> {
+        self.native_slot_roles()
+            .into_iter()
+            .map(|(s, r)| {
+                let (x, y) = self.slot_position(s);
+                Slot {
+                    id: slot_id(s),
+                    role: role(r),
+                    x,
+                    y,
+                }
+            })
+            .collect()
+    }
+    fn container_stack(&self, stack: &ItemStack) -> Stack {
+        Stack {
+            item: stack.item.to_string(),
+            count: stack.count,
+            max: self.max_stack(stack),
+            kind: kind(stack),
+        }
+    }
+    /// The stack of `kind` the screen shows, on the cursor or in a slot.
+    fn container_find(&mut self, of: &Stack) -> Option<ItemStack> {
+        if let Some(c) = self.carried.as_ref().filter(|c| kind(c) == of.kind) {
+            return Some(c.clone());
+        }
+        self.slots()
+            .into_iter()
+            .filter_map(|s| self.slot_view(s))
+            .find(|s| kind(s) == of.kind)
+    }
+    /// The panel's top left corner, None without a window.
+    fn container_origin(&self) -> Option<(f32, f32)> {
+        let r = self.renderer.as_ref()?;
+        Some(self.inventory_origin(&HudBatch::new([r.config.width, r.config.height])))
+    }
+    /// The open screen for the hooks' input, None when no hook may take it.
+    fn container_open(&mut self) -> Option<Open<'_, 'a>> {
+        if self.screen != Screen::Inventory || !engine::containers() {
+            return None;
+        }
+        let origin = self.container_origin()?;
+        Some(Open { game: self, origin })
+    }
+    fn hovered(&self) -> Option<SlotId> {
+        self.inventory_target().0.map(slot_id)
+    }
+    /// A press over the panel: true when a hook took it, and vanilla's drag doesn't start.
+    pub(in crate::game) fn container_press(&mut self, right: bool) -> bool {
+        let slot = self.hovered();
+        let taken = self
+            .container_open()
+            .is_some_and(|mut c| engine::container_press(&mut c, slot, right));
+        if taken {
+            self.inv_drag = None;
+            self.inv_clicks.skip_release();
+        }
+        taken
+    }
+    /// The cursor moved with a button held: true when a hook owns the drag, which ends vanilla's.
+    pub(in crate::game) fn container_drag(&mut self) -> bool {
+        let slot = self.hovered();
+        let taken = self
+            .container_open()
+            .is_some_and(|mut c| engine::container_drag(&mut c, slot));
+        if taken {
+            self.inv_drag = None;
+            self.inv_clicks.skip_release();
+        }
+        taken
+    }
+    pub(in crate::game) fn container_release(&mut self) {
+        if let Some(mut c) = self.container_open() {
+            engine::container_release(&mut c);
+        }
+    }
+    /// The wheel over an inventory screen: true when the Mouse Tweaks or a hook used it.
+    pub(in crate::game) fn container_scroll(&mut self, steps: f32) -> bool {
+        let slot = self.inventory_target().0;
+        if self.tweak_scroll(steps, slot) {
+            return true;
+        }
+        let slot = slot.map(slot_id);
+        self.container_open()
+            .is_some_and(|mut c| engine::container_wheel(&mut c, slot, steps))
+    }
+    /// A key the screen got: sorting's key, else a hook's.
+    pub(in crate::game) fn container_key_press(&mut self, key: KeyCode) -> bool {
+        self.sort_key_press(key)
+            || keybinds::key_name(key).is_some_and(|name| self.container_key(name))
+    }
+    /// A mouse button the screen got, as a key.
+    pub(in crate::game) fn container_mouse_press(&mut self, button: MouseButton) -> bool {
+        self.sort_mouse_press(button) || self.container_key(&keybinds::mouse_name(button))
+    }
+    fn container_key(&mut self, name: &str) -> bool {
+        if self.recipe_search_focused() {
+            return false;
+        }
+        let slot = self.hovered();
+        self.container_open()
+            .is_some_and(|mut c| engine::container_key(&mut c, slot, name))
+    }
+    /// Draws the sort buttons and the hooks' drawing over the panel at (`ox`, `oy`).
+    pub(in crate::game) fn draw_container_extras(&self, batch: &mut HudBatch, ox: f32, oy: f32) {
+        self.draw_sort_buttons(batch, ox, oy);
+        if !engine::containers() {
+            return;
+        }
+        let view = View {
+            game: self,
+            origin: (ox, oy),
+        };
+        extras_hud::draw_on_panel(batch, &self.gui.atlas, (ox, oy), |canvas| {
+            engine::container_draw(&view, canvas);
+        });
+    }
+}
+
+/// What both readings answer alike.
+macro_rules! reads {
+    () => {
+        fn menu(&self) -> &str {
+            self.game.container_menu()
+        }
+        fn slots(&self) -> Vec<Slot> {
+            self.game.container_slots()
+        }
+        fn carried(&self) -> Option<Stack> {
+            let c = self.game.carried.as_ref()?;
+            Some(self.game.container_stack(c))
+        }
+        fn spread(&self) -> usize {
+            self.game.inv_drag.as_ref().map_or(0, |(_, s)| s.len())
+        }
+        fn cursor(&self) -> (f32, f32) {
+            let (x, y) = self.game.cursor;
+            (x - self.origin.0, y - self.origin.1)
+        }
+        fn shift(&self) -> bool {
+            self.game.has_shift_down()
+        }
+    };
+}
+
+impl Container for Open<'_, '_> {
+    reads!();
+    fn stack(&mut self, slot: SlotId) -> Option<Stack> {
+        let s = self.game.slot_view(game_slot(slot))?;
+        Some(self.game.container_stack(&s))
+    }
+    fn takes_one(&mut self, slot: SlotId, of: &Stack) -> bool {
+        self.game
+            .container_find(of)
+            .is_some_and(|s| self.game.tweak_takes_one(game_slot(slot), &s))
+    }
+    fn landing(&mut self, slot: SlotId) -> Vec<SlotId> {
+        let landing = self.game.tweak_landing(game_slot(slot));
+        landing.into_iter().map(slot_id).collect()
+    }
+    fn click(&mut self, slot: SlotId, click: Click) -> bool {
+        let slot = game_slot(slot);
+        match click {
+            Click::Pick { right } => self.game.tweak_click(slot, i32::from(right), Input::Pickup),
+            Click::QuickMove => self.game.tweak_click(slot, 0, Input::QuickMove),
+            Click::Put { one } => self.game.tweak_put(slot, one),
+            _ => false,
+        }
+    }
+    fn order(&mut self, slot: SlotId) -> (u32, String) {
+        let Some(s) = self.game.slot_view(game_slot(slot)) else {
+            return (u32::MAX, String::new());
+        };
+        let order = self.game.creative_screen.order_of(&s);
+        let order = order.map_or(u32::MAX, |o| u32::try_from(o).unwrap_or(u32::MAX));
+        (order, hover_name(&self.game.pack.names, &s))
+    }
+}
+
+/// Drawing gets `&dyn Container`, which can't call the `&mut self` reads.
+impl Container for View<'_, '_> {
+    reads!();
+    fn stack(&mut self, _: SlotId) -> Option<Stack> {
+        None
+    }
+    fn takes_one(&mut self, _: SlotId, _: &Stack) -> bool {
+        false
+    }
+    fn landing(&mut self, _: SlotId) -> Vec<SlotId> {
+        Vec::new()
+    }
+    fn click(&mut self, _: SlotId, _: Click) -> bool {
+        false
+    }
+    fn order(&mut self, _: SlotId) -> (u32, String) {
+        (u32::MAX, String::new())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use horizon_client::items::ItemStack;
+
+    fn stack(item: &str, count: u32, damage: u32) -> ItemStack {
+        ItemStack {
+            item: item.into(),
+            count,
+            damage,
+            extra: None,
+        }
+    }
+
+    #[test]
+    fn stacks_that_merge_share_a_kind() {
+        let a = kind(&stack("minecraft:stone", 1, 0));
+        assert_eq!(
+            a,
+            kind(&stack("minecraft:stone", 64, 0)),
+            "the count is no part"
+        );
+        assert_ne!(a, kind(&stack("minecraft:dirt", 1, 0)));
+        let worn = stack("minecraft:iron_sword", 1, 3);
+        assert_ne!(kind(&worn), kind(&stack("minecraft:iron_sword", 1, 0)));
+    }
+}

crates/horizon-client/src/game/lan_particles.rs

@@ -571,7 +571,7 @@ impl Game<'_> {
             return;
         };
         // Combat feel Legacy draws a hit as 1.8.9 did: no sweep, no damage hearts.
-        if self.settings.extras.pvp.combat.hides_particle(options.ty) {
+        if self.particle_hidden(options.ty) {
             return;
         }
         let (d, s) = (p.dist.map(f64::from), p.max_speed.map(f64::from));

crates/horizon-client/src/game/legacy_rules.rs

@@ -8,7 +8,7 @@ impl Game<'_> {
     /// Whether the hits this game resolves follow 1.8.9: legacy rules are on and this game
     /// is the server (its own server thread, a LAN host, a dedicated server).
     pub(super) fn legacy_rules(&self) -> bool {
-        self.remote.is_none() && self.settings.extras.pvp.combat.rules
+        self.remote.is_none() && self.pvp_legacy_rules()
     }
 
     /// `melee_damage` under legacy rules: (damage, attack strength, critical, enchanted).

crates/horizon-client/src/game/loading_window.rs

@@ -200,7 +200,7 @@ pub(super) fn loading_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        pvp: Default::default(),
+        look: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

crates/horizon-client/src/game/look.rs

@@ -0,0 +1,91 @@
+//! What a crate above may change in how the game draws (`horizon_hooks::look`): the engine reads
+//! it here only, and each reading is vanilla's while nothing set a look. PvP & HUD sets it today
+//! (`game/extras/pvp.rs`).
+use super::{Dim, Game};
+use horizon_client::{chat::ChatQol, particles::ParticleType};
+use horizon_hooks::look::{Chat, Frame, engine::get as look};
+
+impl Game<'_> {
+    /// 1.8.9's pictures of a fight: the sword block, the flat item pose and the hand swing.
+    pub(super) fn legacy_pose(&self) -> bool {
+        look().legacy_pose
+    }
+    pub(super) fn attack_indicator_hidden(&self) -> bool {
+        look().hide_attack_indicator
+    }
+    /// A sound a server sent that this player doesn't hear (`Look::mutes_sound`).
+    pub(super) fn sound_muted(&self, name: &str) -> bool {
+        look().mutes_sound(name)
+    }
+    /// A particle a server sent that this player doesn't see: with the attack particles hidden,
+    /// the sweep and the damage hearts, which 1.9 added to a hit (1.8.9's show crits only).
+    pub(super) fn particle_hidden(&self, ty: ParticleType) -> bool {
+        let attack = matches!(
+            ty,
+            ParticleType::SweepAttack | ParticleType::DamageIndicator
+        );
+        attack && look().hide_attack_particles
+    }
+    /// The block outline, hurt overlay and glint colours the renderer draws with.
+    pub(super) fn look_frame(&self) -> Frame {
+        look().frame
+    }
+    /// The enchantment glint's colour texel, 0 for vanilla's.
+    pub(super) fn glint_texel(&self) -> u32 {
+        look().frame.glint
+    }
+    /// The held shield's size in percent (100 is vanilla's).
+    pub(super) fn shield_size(&self) -> u8 {
+        look().shield_size
+    }
+    /// The totem animation's scale (1 is vanilla's).
+    pub(super) fn totem_scale(&self) -> f32 {
+        look().totem_scale
+    }
+    /// How far the first-person fire overlay is lowered, as a fraction (0 is vanilla's).
+    pub(super) fn fire_lower(&self) -> f32 {
+        look().fire_lower
+    }
+    /// Lava's fog as with fire resistance, and water's as fully adapted.
+    pub(super) fn clear_fluids(&self) -> (bool, bool) {
+        let look = look();
+        (look.clear_lava, look.clear_water)
+    }
+    /// The chat's extras: Ctrl+F search, copy on click, timestamps, repeats counted.
+    pub(super) fn chat_look(&self) -> Chat {
+        look().chat
+    }
+    /// What the chat lays its lines out with.
+    pub(super) fn chat_qol(&self) -> ChatQol {
+        let chat = look().chat;
+        ChatQol {
+            timestamps: chat.timestamps,
+            compact: chat.compact,
+        }
+    }
+    /// Whether vanilla's status effect icons are left out (`Hud.extractEffects`).
+    pub(super) fn effect_icons_hidden(&self) -> bool {
+        look().hide_effect_icons
+    }
+    /// Whether this window may draw its own time and weather: only a client of a server (single
+    /// player's included) draws them, never the server that ticks the world.
+    fn own_view(&self) -> bool {
+        self.remote.is_some() && self.dim == Dim::Overworld
+    }
+    /// The day time the frame draws (sky, sun, moon, the sky's light): the look's time of day,
+    /// else the world's. The world's own `day_time` and everything that plays by it stay.
+    pub(super) fn view_day_time(&self) -> i64 {
+        if !self.own_view() {
+            return self.world.day_time;
+        }
+        look().day_time(self.world.day_time)
+    }
+    /// The rain and thunder levels the frame draws (rain, the sky's colour and light, fog): the
+    /// look's weather, else the world's. Gameplay (riptide, mobs, crops) keeps the world's.
+    pub(super) fn view_weather(&self, partial: f32) -> (f32, f32) {
+        match look().weather {
+            Some(levels) if self.own_view() && self.can_have_weather() => levels,
+            _ => self.weather_levels(partial),
+        }
+    }
+}

crates/horizon-client/src/game/pad_craft.rs

@@ -299,7 +299,7 @@ impl Game<'_> {
     /// address isn't, even on this computer or the local network: an address can be a proxy, a
     /// tunnel or a friend's relay as well.
     fn direct_craft_free_server(&self) -> bool {
-        self.server_is_lan()
+        self.last_server.lan()
             || self
                 .remote
                 .as_ref()

crates/horizon-client/src/game/play_keys.rs

@@ -62,7 +62,7 @@ impl Game<'_> {
             }
             return Ok(());
         }
-        if self.sort_key_press(key)
+        if self.container_key_press(key)
             || horizon_client::keybinds::key_name(key)
                 .is_some_and(|name| self.hud_editor_key_press(name))
         {

crates/horizon-client/src/game/remote.rs

@@ -979,7 +979,7 @@ impl Game<'_> {
         lan: bool,
         realm: bool,
     ) -> Result<()> {
-        self.realm_session = realm;
+        self.last_server.realm = realm;
         self.reset_tutorial();
         self.perf.world_opening();
         // A server's own biomes come over the connection; the last local
@@ -1027,7 +1027,7 @@ impl Game<'_> {
                 root.clone(),
             ),
             None => {
-                self.extras_connecting(address, name, lan);
+                self.last_server.connecting(address, name, lan);
                 match cookies {
                     Some(cookies) => Session::connect_transferred(
                         address,
@@ -1522,7 +1522,7 @@ impl Game<'_> {
         self.finish_perf();
         if reason.is_none() {
             // Leaving on purpose: nothing for auto-reconnect to retry.
-            self.extras_left();
+            self.last_server.left();
         }
         self.clear_waypoints();
         self.hud_disconnected();
@@ -2288,7 +2288,7 @@ impl Game<'_> {
                     uuid,
                 } => {
                     self.set_registries(registries);
-                    self.extras_joined();
+                    self.last_server.joined();
                     // handleLogin: the level loading screen replaces any dialog.
                     self.close_dialogs();
                     if let Some(r) = self.remote.as_mut() {
@@ -2430,9 +2430,9 @@ impl Game<'_> {
                         self.connect_server_with_cookies(&address, &name, Some(cookies))?;
                         return Ok(());
                     }
-                    let retry = self.reconnect_after(&reason, key.as_deref(), from_server);
+                    let plan = self.last_server.ended(&reason, key.as_deref(), from_server);
                     self.leave_server(Some(reason))?;
-                    self.offer_reconnect(retry);
+                    horizon_client::last_server::offer(self.title.as_mut(), plan);
                     return Ok(());
                 }
                 Event::Packet(packet) => self.handle_packet(*packet)?,
@@ -3873,7 +3873,7 @@ impl Game<'_> {
             C::Explode(p) => self.remote_explode(&p),
             C::Sound(p) => {
                 if let Some(name) = self.remote_sound_name(&p.sound)
-                    && !self.settings.extras.pvp.combat.mutes_sound(&name)
+                    && !self.sound_muted(&name)
                 {
                     let at = [
                         f64::from(p.x) / 8.0,
@@ -3895,7 +3895,7 @@ impl Game<'_> {
             }
             C::SoundEntity(p) => {
                 if let Some(name) = self.remote_sound_name(&p.sound)
-                    && !self.settings.extras.pvp.combat.mutes_sound(&name)
+                    && !self.sound_muted(&name)
                     && let Some(state) = self.remote_sound_entity_state(p.id)
                 {
                     let source = usize::try_from(p.source)
@@ -6746,7 +6746,7 @@ impl Game<'_> {
         // (`KeyboardInput.tick`: 8 directions, full speed). The server only hears those keys
         // (`ServerboundPlayerInputPacket`), and an anticheat that predicts from them pulls back
         // a player moving at the stick's own angle and speed.
-        if self.integrated.is_none() && self.server_address().is_some() {
+        if self.integrated.is_none() && self.last_server.address().is_some() {
             keys.analog = None;
         }
         let [mut strafe, mut forward] = keys.direction();

crates/horizon-client/src/game/render_tick.rs

@@ -164,8 +164,8 @@ impl Game<'_> {
             boss_world_fog: self.boss_overlay.should_create_world_fog(),
             spectator: self.spectator(),
             fire_resistance: self.potions.effects.get("fire_resistance").is_some()
-                || self.settings.extras.pvp.tweaks.clear_lava,
-            full_water_vision: self.settings.extras.pvp.tweaks.clear_water,
+                || self.clear_fluids().0,
+            full_water_vision: self.clear_fluids().1,
             night_vision: self.fog_night_vision(),
             environment: self.pack.polytone_colors.env,
         };
@@ -405,7 +405,7 @@ impl Game<'_> {
             on_fire: self.camera_type.first_person()
                 && !self.spectator()
                 && self.player.as_ref().is_some_and(|p| p.fire_ticks > 0),
-            fire_lower: f32::from(self.settings.extras.pvp.tweaks.fire_lower) / 100.0,
+            fire_lower: self.fire_lower(),
             gui_overlays: &gui_overlays,
         })
     }

crates/horizon-client/src/game/social.rs

@@ -150,7 +150,7 @@ impl Game<'_> {
     }
     /// The server's name: a local world's name, a server's entry in the list.
     fn social_server_name(&self) -> String {
-        match (&self.integrated, self.server_address()) {
+        match (&self.integrated, self.last_server.address()) {
             (Some(server), _) => server.world_name.clone(),
             (None, Some(address)) if self.remote.is_some() => address.to_owned(),
             _ => self.level.name.clone(),

crates/horizon-client/src/game/split.rs

@@ -261,6 +261,8 @@ impl<'a> Split<'a> {
                 .get(i.wrapping_sub(1))
                 .map(|g| g.options.clone()),
         );
+        let seat = self.guests.get(i.wrapping_sub(1)).map_or(1, |g| g.seat);
+        horizon_hooks::engine::set_seat(seat - 1);
         self.turn = i;
     }
 
@@ -513,7 +515,7 @@ impl<'a> Split<'a> {
         if self.host.integrated.is_some() || self.host.remote.is_none() {
             return None;
         }
-        self.host.server_address().map(str::to_owned)
+        self.host.last_server.address().map(str::to_owned)
     }
 
     /// The pads' players who accepted, and the testing players (`HORIZON_SPLIT`, one a frame),

crates/horizon-client/src/game/split/players.rs

@@ -126,6 +126,7 @@ impl Split<'_> {
         // Until it has a profile, a scratch options file: never P1's.
         let options = Self::folder()?.join(".joining/options.txt");
         OPTIONS.set(Some(options.clone()));
+        horizon_hooks::engine::set_seat(seat - 1);
         let mut settings = self.host.settings.clone();
         if pad.is_some() {
             // The Controller setting is P1's own: a player who pressed a pad to join plays
@@ -135,6 +136,7 @@ impl Split<'_> {
         }
         let game = self.start_guest(seat, &options, settings);
         OPTIONS.set(None);
+        horizon_hooks::engine::set_seat(0);
         let mut game = game?;
         if let Some(pad) = pad {
             // The press that joined it doesn't act in its game.
@@ -299,16 +301,31 @@ impl Split<'_> {
         }
         let profile = profiles.join(&name);
         let options = profile.join("options.txt");
-        let mut settings = if options.exists() {
-            horizon_client::settings::Settings::load(&options)
+        let made = if options.exists() {
+            None
         } else {
             std::fs::create_dir_all(&profile)?;
             let mut new = self.host.settings.clone();
             // The Controller setting is P1's, as on the profile page (`join`).
             new.controller.enabled |= self.guests[i].pad.is_some();
+            // On P1's seat, so the crates' settings stores write P1's values too.
+            let turn = horizon_hooks::seat();
+            horizon_hooks::engine::set_seat(0);
             new.save(&options);
-            new
+            horizon_hooks::engine::set_seat(turn);
+            Some(new)
         };
+        // The crates' stores load into the guest's seat, before its turn starts below.
+        let turn = horizon_hooks::seat();
+        horizon_hooks::engine::set_seat(self.guests[i].seat - 1);
+        let mut settings = match made {
+            Some(new) => {
+                horizon_client::settings::Settings::load_stores(&options);
+                new
+            }
+            None => horizon_client::settings::Settings::load(&options),
+        };
+        horizon_hooks::engine::set_seat(turn);
         // A profile an earlier join saved with P1's off, or the player's pad would be dead.
         settings.controller.enabled |= self.guests[i].pad.is_some();
         // P1's own world through memory (`Ok`), else P1's server over the network (`Err`).

crates/horizon-client/src/game/totem.rs

@@ -206,7 +206,7 @@ impl Game<'_> {
             to_world.transform_vector3(b).normalize(),
         );
         // PvP & HUD's totem animation size (100% is vanilla's), about the item's centre.
-        let size = f32::from(self.settings.extras.pvp.tweaks.totem_size) / 100.0;
+        let size = self.totem_scale();
         let pose = pose * glam::Mat4::from_scale(glam::Vec3::splat(size));
         self.submit_item_lit(&state, to_world * pose, vertex_light(0xFF), lights, out);
     }

crates/horizon-client/src/game/world_session.rs

@@ -1,8 +1,24 @@
 //! Opening and closing a local world from the client: the title screen's actions, entering a
-//! world on the server thread, and saving and leaving it on exit.
+//! world on the server thread, and saving and leaving it on exit. Also connecting again to a
+//! server when an attempt a hook planned is due (`last_server.rs`).
 use super::*;
 
 impl Game<'_> {
+    /// Connects again once a planned attempt's countdown is over. An online-mode server gets the
+    /// signed-in account again: `connect_server` takes it from `auth::current()`, held in memory
+    /// for the whole run (the launcher's session file is gone after the first read).
+    pub(super) fn reconnect_when_due(&mut self) -> Result<()> {
+        if let Some(retry) = self.title.as_mut().and_then(|t| t.due_retry()) {
+            self.connect_server_with_options(
+                &retry.address,
+                &retry.name,
+                None,
+                retry.lan,
+                self.last_server.realm,
+            )?;
+        }
+        Ok(())
+    }
     /// `onAbort`: the confirm screen's Back or Escape reopens the Data
     /// Packs screen with the selection it had.
     pub(super) fn reopen_data_packs(&mut self, event_loop: &dyn EventLoopCtl) -> Result<()> {

crates/horizon-client/src/last_server.rs

@@ -0,0 +1,96 @@
+//! The multiplayer server this window connected to last, which splitscreen players join and the
+//! friends service's presence names, and the connection's lifecycle as the hooks of the layers
+//! above hear it (`horizon_hooks`: connecting, joined, left, ended). A hook may plan another
+//! attempt when a connection ends; the Disconnected screen shows its countdown ([`offer`]).
+use crate::{multiplayer, net, title};
+use horizon_hooks::{Ended, Reconnect, Server, engine};
+
+/// What the window knows of its last server. Forgotten when the player leaves it, or when a
+/// connection ends with no attempt planned.
+#[derive(Debug, Default)]
+pub struct LastServer {
+    address: Option<String>,
+    lan: bool,
+    /// The open connection joined from Realms: `ServerData.isRealm` for the friends service's
+    /// presence status.
+    pub realm: bool,
+}
+
+impl LastServer {
+    /// A connection to a multiplayer server starts.
+    pub fn connecting(&mut self, address: &str, name: &str, lan: bool) {
+        self.address = Some(address.to_owned());
+        self.lan = lan;
+        engine::connecting(&Server::new(address, name, lan));
+    }
+    /// The server let the player in.
+    pub fn joined(&self) {
+        engine::joined();
+    }
+    /// The player left on purpose.
+    pub fn left(&mut self) {
+        self.forget();
+        engine::left();
+    }
+    /// The connection ended: the attempt a hook plans, if any.
+    pub fn ended(
+        &mut self,
+        reason: &str,
+        key: Option<&str>,
+        from_server: bool,
+    ) -> Option<Reconnect> {
+        let plan = engine::ended(&Ended::new(reason, key, from_server));
+        if plan.is_none() {
+            self.forget();
+        }
+        plan
+    }
+    fn forget(&mut self) {
+        self.address = None;
+        self.lan = false;
+    }
+    /// The server's address, while the window keeps it.
+    pub fn address(&self) -> Option<&str> {
+        self.address.as_deref()
+    }
+    /// That server was found on the local network.
+    pub fn lan(&self) -> bool {
+        self.lan
+    }
+}
+
+/// Shows a planned attempt's countdown on the Disconnected screen.
+pub fn offer(title: Option<&mut title::Title>, plan: Option<Reconnect>) {
+    let Some(plan) = plan else {
+        return;
+    };
+    if let Some(title) = title
+        && let title::Mode::Multiplayer(multiplayer::Screen::Disconnected { retry, .. }) =
+            &mut title.mode
+    {
+        log::info!(
+            "Horizon: reconnecting to {} in {} s",
+            net::shown_address(&plan.address),
+            plan.seconds_left(std::time::Instant::now())
+        );
+        *retry = Some(plan);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn the_server_is_forgotten_when_left_or_lost_without_a_plan() {
+        let mut last = LastServer::default();
+        last.connecting("example.org", "Player", true);
+        assert_eq!((last.address(), last.lan()), (Some("example.org"), true));
+        // No hook plans an attempt in this test process.
+        assert_eq!(last.ended("Timed out", None, false), None);
+        assert_eq!((last.address(), last.lan()), (None, false));
+        last.connecting("example.org:25566", "Player", false);
+        last.left();
+        assert_eq!(last.address(), None);
+    }
+}

crates/horizon-client/src/multiplayer.rs

@@ -140,8 +140,8 @@ pub enum Screen {
     },
     Disconnected {
         reason: String,
-        /// Auto-reconnect's next attempt, until it is cancelled.
-        retry: Option<crate::reconnect::Retry>,
+        /// The next attempt a hook planned (`last_server`), until it is cancelled.
+        retry: Option<horizon_hooks::Reconnect>,
         /// Wrapped reason lines, set by the last draw; the buttons sit below them.
         lines: std::cell::Cell<usize>,
     },
@@ -1970,7 +1970,7 @@ impl Screen {
         }
     }
     /// Auto-reconnect's attempt, once its countdown is over.
-    pub fn due_retry(&mut self) -> Option<crate::reconnect::Retry> {
+    pub fn due_retry(&mut self) -> Option<horizon_hooks::Reconnect> {
         let Self::Disconnected { retry, .. } = self else {
             return None;
         };

crates/horizon-client/src/reconnect.rs

@@ -2,8 +2,18 @@
 //! connection may be retried, and when. Only lost connections and the
 //! server's own shutdown or restart are retried, never kicks, bans or
 //! refusals; attempts back off and stop after a few.
+//!
+//! It runs on the engine's connection hooks ([`HOOKS`], `horizon_hooks`): the engine
+//! reports a connection's start, join, leave and end, and shows and runs the attempt
+//! this plans. Nothing else in the engine reads it, so it leaves for a Horizon crate
+//! as a file move once its setting can leave too (docs/layers.md, plan M5).
+use horizon_hooks::{Ended, Hooks, Server, seat};
+use std::sync::Mutex;
 use std::time::{Duration, Instant};
 
+/// A planned attempt.
+pub use horizon_hooks::Reconnect as Retry;
+
 /// Seconds before each attempt; there are no more after the last.
 pub const DELAYS: [u64; 5] = [5, 10, 20, 40, 60];
 /// Staying connected this long counts the next drop as a fresh one.
@@ -111,43 +121,7 @@ pub struct Tracker {
     attempts: usize,
     joined: Option<Instant>,
 }
-/// A planned attempt.
-#[derive(Clone, Debug, PartialEq)]
-pub struct Retry {
-    pub address: String,
-    pub name: String,
-    pub lan: bool,
-    pub at: Instant,
-    /// 1-based, of `DELAYS.len()`.
-    pub attempt: usize,
-}
-impl Retry {
-    /// Whole seconds left, rounded up.
-    pub fn seconds_left(&self, now: Instant) -> u64 {
-        let left = self.at.saturating_duration_since(now);
-        left.as_secs() + u64::from(left.subsec_nanos() > 0)
-    }
-    pub fn due(&self, now: Instant) -> bool {
-        now >= self.at
-    }
-    pub fn text(&self, now: Instant) -> String {
-        format!(
-            "Reconnecting in {} s (attempt {} of {})",
-            self.seconds_left(now),
-            self.attempt,
-            DELAYS.len()
-        )
-    }
-}
 impl Tracker {
-    /// The server connected to last (splitscreen players join the same one).
-    pub fn address(&self) -> Option<&str> {
-        self.address.as_deref()
-    }
-    /// That server was found on the local network.
-    pub fn lan(&self) -> bool {
-        self.lan
-    }
     /// A connection to `address` as `name` starts: a new address starts
     /// counting anew.
     pub fn connecting(&mut self, address: &str, name: &str, lan: bool) {
@@ -196,6 +170,65 @@ impl Tracker {
             lan: self.lan,
             at: now + delay,
             attempt: self.attempts,
+            attempts: DELAYS.len(),
+        })
+    }
+}
+
+/// Auto-reconnect on the engine's connection hooks: registered at startup with the other
+/// extras (`entry.rs`); it plans nothing while its setting is off. Splitscreen players share
+/// the hooks, so each seat (`horizon_hooks::seat`) has its own tracker and setting, as each
+/// player's game had before.
+pub static HOOKS: AutoReconnect = AutoReconnect {
+    seats: Mutex::new(Vec::new()),
+};
+
+pub struct AutoReconnect {
+    seats: Mutex<Vec<Seat>>,
+}
+
+#[derive(Default)]
+struct Seat {
+    tracker: Tracker,
+    enabled: bool,
+}
+
+impl AutoReconnect {
+    /// The `autoReconnect` setting of the player whose turn it is.
+    pub fn set_enabled(&self, on: bool) {
+        self.with(|s| s.enabled = on);
+    }
+    fn with<T>(&self, f: impl FnOnce(&mut Seat) -> T) -> T {
+        let mut seats = self.seats.lock().unwrap_or_else(|e| e.into_inner());
+        let i = seat();
+        if seats.len() <= i {
+            seats.resize_with(i + 1, Seat::default);
+        }
+        f(&mut seats[i])
+    }
+}
+
+impl Hooks for AutoReconnect {
+    fn connecting(&self, server: &Server<'_>) {
+        self.with(|s| {
+            s.tracker
+                .connecting(server.address, server.name, server.lan)
+        });
+    }
+    fn joined(&self) {
+        self.with(|s| s.tracker.joined(Instant::now()));
+    }
+    fn left(&self) {
+        self.with(|s| s.tracker.reset());
+    }
+    fn ended(&self, end: &Ended<'_>) -> Option<Retry> {
+        self.with(|s| {
+            if !s.enabled {
+                s.tracker.reset();
+                return None;
+            }
+            s.tracker
+                .ended(end.reason, end.key, end.from_server, Instant::now())
         })
     }
 }
@@ -458,6 +491,33 @@ mod tests {
         );
     }
 
+    #[test]
+    fn each_splitscreen_seat_keeps_its_own_attempts_and_setting() {
+        use horizon_hooks::engine::set_seat;
+        let hooks = AutoReconnect {
+            seats: Mutex::new(Vec::new()),
+        };
+        let lost = Ended::new("Timed out", Some("disconnect.timeout"), false);
+        for (seat, on) in [(0, false), (1, true)] {
+            set_seat(seat);
+            hooks.set_enabled(on);
+            hooks.connecting(&Server::new("example.org", "Player", false));
+        }
+        // P2 has it on: an attempt in 5 s. P1 has it off: none, and P2's state stays.
+        set_seat(1);
+        assert_eq!(hooks.ended(&lost).map(|r| r.attempt), Some(1));
+        set_seat(0);
+        assert_eq!(hooks.ended(&lost), None);
+        set_seat(1);
+        hooks.connecting(&Server::new("example.org", "Player", false));
+        assert_eq!(hooks.ended(&lost).map(|r| r.attempt), Some(2));
+        // P2 leaving on purpose starts it over.
+        hooks.left();
+        hooks.connecting(&Server::new("example.org", "Player", false));
+        assert_eq!(hooks.ended(&lost).map(|r| r.attempt), Some(1));
+        set_seat(0);
+    }
+
     #[test]
     fn the_countdown_rounds_up() {
         let now = Instant::now();
@@ -467,6 +527,7 @@ mod tests {
             lan: false,
             at: now + Duration::from_millis(4200),
             attempt: 2,
+            attempts: DELAYS.len(),
         };
         assert_eq!(r.seconds_left(now), 5);
         assert_eq!(r.text(now), "Reconnecting in 5 s (attempt 2 of 5)");

crates/horizon-client/src/title.rs

@@ -4707,7 +4707,7 @@ Would you like to enable the Narrator or visit the Accessibility Settings?",
         }
     }
     /// The server auto-reconnect retries now, once its countdown is over.
-    pub fn due_retry(&mut self) -> Option<crate::reconnect::Retry> {
+    pub fn due_retry(&mut self) -> Option<horizon_hooks::Reconnect> {
         match &mut self.mode {
             Mode::Multiplayer(screen) => screen.due_retry(),
             _ => None,

crates/horizon-hooks/src/containers.rs

@@ -0,0 +1,93 @@
+//! Container screens (docs/layers.md, "Container screens"): input and drawing on an open container
+//! screen (the inventory, chests, furnaces, crafting tables...) for a crate above the engine, as
+//! Mouse Tweaks and sorting need. The engine implements [`Container`] for the length of one call
+//! of a hook (`Hooks::container_press` and the others); everything in it is plain data.
+
+/// A slot of the open screen: opaque, stable while the screen is open.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub struct SlotId(pub u32);
+
+/// What a slot is for.
+#[non_exhaustive]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Role {
+    /// The player's hotbar.
+    Hotbar,
+    /// The player's main inventory, above the hotbar.
+    Inventory,
+    /// A slot that only holds items: a chest's, a hopper's, a mount's chest.
+    Storage,
+    /// A slot a recipe or a furnace reads: a crafting grid's, a furnace's input and fuel.
+    Input,
+    /// A slot that only gives: a crafting or furnace result.
+    Result,
+    /// The player's armour and off hand, a mount's saddle and armour.
+    Equipment,
+    Other,
+}
+
+/// A slot drawn on the screen.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Slot {
+    pub id: SlotId,
+    pub role: Role,
+    /// Its top left corner in GUI pixels, from the panel's.
+    pub x: f32,
+    pub y: f32,
+}
+
+/// The items in a slot or on the cursor.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct Stack {
+    /// The item's id (`minecraft:stone`).
+    pub item: String,
+    pub count: u32,
+    /// How many one slot holds of it.
+    pub max: u32,
+    /// Equal for stacks of the same item with the same components: those merge.
+    pub kind: u64,
+}
+
+/// One ordinary slot click, as vanilla's screen sends it.
+#[non_exhaustive]
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Click {
+    /// Picks up, puts down or swaps (`PICKUP`), the left or right button.
+    Pick { right: bool },
+    /// The Shift click (`QUICK_MOVE`).
+    QuickMove,
+    /// Puts the cursor's stack, or one of it, in the slot as a one-slot drag (`QUICK_CRAFT`): a
+    /// server whose cursor is already empty ignores it, where a click would pick up the slot.
+    Put { one: bool },
+}
+
+/// The open screen's menu, for the length of one call. The engine implements it. The reads that
+/// ask the menu's rules take `&mut self`, as the engine's do; drawing gets the others only.
+pub trait Container {
+    /// Its menu type: `inventory` for the player's own, else the registry name the server opened
+    /// (`minecraft:generic_9x3`, `minecraft:furnace`...).
+    fn menu(&self) -> &str;
+    /// Every slot drawn, in the screen's order, in every menu: a crate keeps to the menus it acts
+    /// in, by [`Container::menu`] (Mouse Tweaks stays out of those whose slots cost or trigger
+    /// something: anvils, enchanting, merchants, beacons, crafters). Creative's tabs are no
+    /// container screen.
+    fn slots(&self) -> Vec<Slot>;
+    fn stack(&mut self, slot: SlotId) -> Option<Stack>;
+    /// The stack on the cursor.
+    fn carried(&self) -> Option<Stack>;
+    /// Whether `slot` takes one more of `of`, by the menu's rules (`mayPlace`, the slot's limit).
+    fn takes_one(&mut self, slot: SlotId, of: &Stack) -> bool;
+    /// Where a Shift click on `slot` would put its items (`quickMoveStack`), first first.
+    fn landing(&mut self, slot: SlotId) -> Vec<SlotId>;
+    /// One ordinary click. False when nothing took it.
+    fn click(&mut self, slot: SlotId, click: Click) -> bool;
+    /// How many slots vanilla's drag of the cursor's stack spreads over now (0 while none runs).
+    fn spread(&self) -> usize;
+    /// The cursor, in GUI pixels from the panel's corner.
+    fn cursor(&self) -> (f32, f32);
+    /// Whether Shift is held.
+    fn shift(&self) -> bool;
+    /// The creative tabs' order of the stack in `slot` (`u32::MAX` when no tab lists it) and the
+    /// name it shows: how sorting ranks it.
+    fn order(&mut self, slot: SlotId) -> (u32, String);
+}

crates/horizon-hooks/src/lib.rs

@@ -17,13 +17,18 @@
 //! pages, [`hud`] for what it draws on the HUD.
 #![forbid(unsafe_code)]
 
+pub mod containers;
 pub mod hud;
+pub mod look;
 pub mod pages;
 mod registry;
 pub mod settings;
 
+use containers::{Container, SlotId};
 use registry::Registry;
+use std::cell::Cell;
 use std::sync::atomic::{AtomicBool, Ordering};
+use std::time::Instant;
 
 /// What a crate above the engine hears from the game. Every method has an empty default:
 /// implement only those you need. Hooks run on the game's thread (the render thread) unless a
@@ -40,6 +45,49 @@ pub trait Hooks: Sync {
 
     /// The game is ending normally: its window closed and the world is saved. Not after a crash.
     fn shutdown(&self) {}
+
+    /// This window starts connecting to a multiplayer server (the server list, a direct
+    /// connection, a Realm, a LAN world). Not single player's own server.
+    fn connecting(&self, _server: &Server<'_>) {}
+
+    /// The server let the player in.
+    fn joined(&self) {}
+
+    /// The player left the server on purpose: nothing to retry.
+    fn left(&self) {}
+
+    /// The connection ended without the player leaving it (lost, closed, kicked, refused). A hook
+    /// may plan another attempt: the engine shows its countdown on the Disconnected screen, with
+    /// Cancel, and connects again when it is due. Every hook hears the end; the first plan wins.
+    fn ended(&self, _end: &Ended<'_>) -> Option<Reconnect> {
+        None
+    }
+
+    // An open container screen (`containers`): each input hook returns whether it took the
+    // input, and then vanilla's handling of it doesn't run. The first hook that takes it wins.
+
+    /// A mouse button went down over the panel, on `slot` or none.
+    fn container_press(&self, _c: &mut dyn Container, _slot: Option<SlotId>, _right: bool) -> bool {
+        false
+    }
+    /// The cursor moved with a button held, now over `slot` or none.
+    fn container_drag(&self, _c: &mut dyn Container, _slot: Option<SlotId>) -> bool {
+        false
+    }
+    /// The button went up. Every hook hears it.
+    fn container_release(&self, _c: &mut dyn Container) {}
+    /// The wheel turned `steps` notches over `slot` or none (up is positive; a trackpad turns it
+    /// in fractions).
+    fn container_wheel(&self, _c: &mut dyn Container, _slot: Option<SlotId>, _steps: f32) -> bool {
+        false
+    }
+    /// A key or a mouse button the screen got, by its name (`key.keyboard.r`, `key.mouse.middle`),
+    /// with the cursor over `slot` or none.
+    fn container_key(&self, _c: &mut dyn Container, _slot: Option<SlotId>, _key: &str) -> bool {
+        false
+    }
+    /// Draws over the panel, from its top left corner, after the slots and before the tooltip.
+    fn container_draw(&self, _c: &dyn Container, _canvas: &mut dyn hud::Canvas) {}
 }
 
 /// What [`Hooks::started`] gets.
@@ -55,6 +103,77 @@ impl<'a> Started<'a> {
     }
 }
 
+/// What [`Hooks::connecting`] gets.
+#[non_exhaustive]
+pub struct Server<'a> {
+    /// As the player gave it (`host[:port]`).
+    pub address: &'a str,
+    /// The player name the connection uses.
+    pub name: &'a str,
+    /// Found on the local network.
+    pub lan: bool,
+}
+
+impl<'a> Server<'a> {
+    pub fn new(address: &'a str, name: &'a str, lan: bool) -> Self {
+        Self { address, name, lan }
+    }
+}
+
+/// What [`Hooks::ended`] gets.
+#[non_exhaustive]
+pub struct Ended<'a> {
+    /// The reason shown on the Disconnected screen.
+    pub reason: &'a str,
+    /// Its translation key, when it has one (`disconnect.timeout`, `multiplayer.disconnect.kicked`).
+    pub key: Option<&'a str>,
+    /// The server sent it (a disconnect packet), rather than the connection failing.
+    pub from_server: bool,
+}
+
+impl<'a> Ended<'a> {
+    pub fn new(reason: &'a str, key: Option<&'a str>, from_server: bool) -> Self {
+        Self {
+            reason,
+            key,
+            from_server,
+        }
+    }
+}
+
+/// Another attempt at a server, planned by [`Hooks::ended`].
+#[derive(Clone, Debug, PartialEq)]
+pub struct Reconnect {
+    pub address: String,
+    pub name: String,
+    pub lan: bool,
+    /// When to connect.
+    pub at: Instant,
+    /// This attempt, 1-based, of `attempts`.
+    pub attempt: usize,
+    pub attempts: usize,
+}
+
+impl Reconnect {
+    /// Whole seconds left, rounded up.
+    pub fn seconds_left(&self, now: Instant) -> u64 {
+        let left = self.at.saturating_duration_since(now);
+        left.as_secs() + u64::from(left.subsec_nanos() > 0)
+    }
+    pub fn due(&self, now: Instant) -> bool {
+        now >= self.at
+    }
+    /// The Disconnected screen's countdown line.
+    pub fn text(&self, now: Instant) -> String {
+        format!(
+            "Reconnecting in {} s (attempt {} of {})",
+            self.seconds_left(now),
+            self.attempt,
+            self.attempts
+        )
+    }
+}
+
 static HOOKS: Registry<dyn Hooks> = Registry::new();
 
 /// Why [`register`] refused a hook.
@@ -81,10 +200,27 @@ fn all() -> &'static [&'static dyn Hooks] {
     HOOKS.all()
 }
 
+thread_local! {
+    static SEAT: Cell<usize> = const { Cell::new(0) };
+}
+
+/// The splitscreen player whose turn it is: 0 for P1 (and without splitscreen), 1 for P2...
+/// Splitscreen players are one process, each `Game` in turn on the game's thread, so a crate's
+/// statics are shared by them: a crate that keeps per-player state (settings, pages, HUD) indexes
+/// it by this. A player keeps its seat while it plays. Other threads always see 0.
+pub fn seat() -> usize {
+    SEAT.get()
+}
+
 /// The engine's side: where it calls the hooks. Only the engine calls these.
 pub mod engine {
     use super::*;
 
+    /// The player whose turn starts on this thread ([`seat`]).
+    pub fn set_seat(seat: usize) {
+        SEAT.set(seat);
+    }
+
     /// Seals every list (hooks and the registries); their first use does it anyway. Call where
     /// registration ends.
     pub fn seal() {
@@ -121,6 +257,79 @@ pub mod engine {
             hooks.shutdown();
         }
     }
+
+    /// [`Hooks::connecting`].
+    pub fn connecting(server: &Server<'_>) {
+        for hooks in all() {
+            hooks.connecting(server);
+        }
+    }
+
+    /// [`Hooks::joined`].
+    pub fn joined() {
+        for hooks in all() {
+            hooks.joined();
+        }
+    }
+
+    /// [`Hooks::left`].
+    pub fn left() {
+        for hooks in all() {
+            hooks.left();
+        }
+    }
+
+    /// Whether a container screen's input reaches a hook: false while none is registered, and
+    /// the engine builds no `Container` then.
+    pub fn containers() -> bool {
+        !all().is_empty()
+    }
+
+    /// [`Hooks::container_press`]: true when a hook took it.
+    pub fn container_press(c: &mut dyn Container, slot: Option<SlotId>, right: bool) -> bool {
+        all().iter().any(|h| h.container_press(c, slot, right))
+    }
+
+    /// [`Hooks::container_drag`].
+    pub fn container_drag(c: &mut dyn Container, slot: Option<SlotId>) -> bool {
+        all().iter().any(|h| h.container_drag(c, slot))
+    }
+
+    /// [`Hooks::container_release`], to every hook.
+    pub fn container_release(c: &mut dyn Container) {
+        for hooks in all() {
+            hooks.container_release(c);
+        }
+    }
+
+    /// [`Hooks::container_wheel`].
+    pub fn container_wheel(c: &mut dyn Container, slot: Option<SlotId>, steps: f32) -> bool {
+        all().iter().any(|h| h.container_wheel(c, slot, steps))
+    }
+
+    /// [`Hooks::container_key`].
+    pub fn container_key(c: &mut dyn Container, slot: Option<SlotId>, key: &str) -> bool {
+        all().iter().any(|h| h.container_key(c, slot, key))
+    }
+
+    /// [`Hooks::container_draw`].
+    pub fn container_draw(c: &dyn Container, canvas: &mut dyn crate::hud::Canvas) {
+        for hooks in all() {
+            hooks.container_draw(c, canvas);
+        }
+    }
+
+    /// [`Hooks::ended`]: every hook hears it, and the first plan is the one kept.
+    pub fn ended(end: &Ended<'_>) -> Option<Reconnect> {
+        let mut plan = None;
+        for hooks in all() {
+            let mine = hooks.ended(end);
+            if plan.is_none() {
+                plan = mine;
+            }
+        }
+        plan
+    }
 }
 
 #[cfg(test)]
@@ -142,27 +351,126 @@ mod tests {
         fn published(&self, open: bool) {
             self.0.lock().unwrap().push(format!("published {open}"));
         }
+        fn ended(&self, end: &Ended<'_>) -> Option<Reconnect> {
+            self.0.lock().unwrap().push(format!("ended {}", end.reason));
+            None
+        }
     }
 
+    /// Plans an attempt numbered by its field.
+    struct Planner(usize);
+    impl Hooks for Planner {
+        fn ended(&self, end: &Ended<'_>) -> Option<Reconnect> {
+            Some(Reconnect {
+                address: end.reason.to_owned(),
+                name: String::new(),
+                lan: false,
+                at: Instant::now(),
+                attempt: self.0,
+                attempts: 5,
+            })
+        }
+    }
+    static FIRST: Planner = Planner(1);
+    static SECOND: Planner = Planner(2);
+
     /// Implements nothing: the defaults do nothing.
     struct Silent;
     impl Hooks for Silent {}
 
     static RECORDER: Recorder = Recorder(StdMutex::new(Vec::new()));
 
+    /// Takes its key on a container screen; notes what reached it.
+    struct Keys(&'static str, StdMutex<Vec<String>>);
+    impl Hooks for Keys {
+        fn container_key(&self, _: &mut dyn Container, _: Option<SlotId>, key: &str) -> bool {
+            self.1.lock().unwrap().push(format!("key {key}"));
+            key == self.0
+        }
+        fn container_release(&self, _: &mut dyn Container) {
+            self.1.lock().unwrap().push("release".into());
+        }
+    }
+    static SORT: Keys = Keys("key.keyboard.r", StdMutex::new(Vec::new()));
+    static ALSO_R: Keys = Keys("key.keyboard.r", StdMutex::new(Vec::new()));
+
+    /// A screen with nothing in it.
+    struct Empty;
+    impl Container for Empty {
+        fn menu(&self) -> &str {
+            "inventory"
+        }
+        fn slots(&self) -> Vec<containers::Slot> {
+            Vec::new()
+        }
+        fn stack(&mut self, _: SlotId) -> Option<containers::Stack> {
+            None
+        }
+        fn carried(&self) -> Option<containers::Stack> {
+            None
+        }
+        fn takes_one(&mut self, _: SlotId, _: &containers::Stack) -> bool {
+            false
+        }
+        fn landing(&mut self, _: SlotId) -> Vec<SlotId> {
+            Vec::new()
+        }
+        fn click(&mut self, _: SlotId, _: containers::Click) -> bool {
+            false
+        }
+        fn spread(&self) -> usize {
+            0
+        }
+        fn cursor(&self) -> (f32, f32) {
+            (0.0, 0.0)
+        }
+        fn shift(&self) -> bool {
+            false
+        }
+        fn order(&mut self, _: SlotId) -> (u32, String) {
+            (u32::MAX, String::new())
+        }
+    }
+
     #[test]
     fn registered_hooks_hear_the_game_and_late_ones_are_refused() {
         register(&RECORDER).unwrap();
         register(&Silent).unwrap();
+        register(&FIRST).unwrap();
+        register(&SECOND).unwrap();
+        register(&SORT).unwrap();
+        register(&ALSO_R).unwrap();
         engine::started(&Started::new("0.2.31"));
         // Changes only: the same state every frame is said once.
         for open in [false, true, true, true, false, false] {
             engine::published(open);
         }
+        // Every hook hears the end; the first plan registered is the one kept.
+        let plan = engine::ended(&Ended::new("lost", None, false)).unwrap();
+        assert_eq!(plan.attempt, 1);
+        // A container screen's key goes to the first hook that takes it, its release to all.
+        assert!(engine::containers());
+        assert!(!engine::container_key(&mut Empty, None, "key.keyboard.e"));
+        assert!(engine::container_key(&mut Empty, None, "key.keyboard.r"));
+        engine::container_release(&mut Empty);
+        assert_eq!(
+            *SORT.1.lock().unwrap(),
+            ["key key.keyboard.e", "key key.keyboard.r", "release"]
+        );
+        assert_eq!(
+            *ALSO_R.1.lock().unwrap(),
+            ["key key.keyboard.e", "release"],
+            "taken before it"
+        );
         engine::shutdown();
         assert_eq!(
             *RECORDER.0.lock().unwrap(),
-            ["started 0.2.31", "published true", "published false"]
+            [
+                "started 0.2.31",
+                "published true",
+                "published false",
+                "ended lost"
+            ]
         );
         assert_eq!(register(&Silent), Err(TooLate));
     }

crates/horizon-hooks/src/look.rs

@@ -0,0 +1,178 @@
+//! How the engine draws a few things a crate above may change (docs/layers.md, plan M5): PvP &
+//! HUD's look today. Every field's default is vanilla's, so with nothing set the game looks and
+//! sounds as vanilla does.
+//!
+//! Plain data, pushed: a crate changes its own fields of the look of the player whose turn it is
+//! ([`update`]; splitscreen players each have theirs: [`crate::seat`]) when its settings load or
+//! change, and the engine reads it where it draws ([`engine::get`]). Several crates share the
+//! look, each keeping to its fields. Nothing is asked of a crate per frame.
+use std::sync::Mutex;
+
+/// What the engine reads. Built from `Look::default()`, then its fields set.
+#[non_exhaustive]
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Look {
+    /// 1.8.9's pictures of a fight: the sword block, the flat item pose and the hand swing.
+    pub legacy_pose: bool,
+    /// No attack indicator under the crosshair or beside the hotbar.
+    pub hide_attack_indicator: bool,
+    /// The `entity.player.attack.*` sounds a server sends are left out (1.9 added them with the
+    /// attack cooldown; 1.8.9 played none on a hit).
+    pub mute_attack_sounds: bool,
+    /// The sweep and damage-heart particles a server sends are left out (1.9 added them).
+    pub hide_attack_particles: bool,
+    /// The block outline, hurt overlay and glint colours the renderer draws with.
+    pub frame: Frame,
+    /// The first-person shield's size, in percent.
+    pub shield_size: u8,
+    /// The totem animation's scale.
+    pub totem_scale: f32,
+    /// How far down the first-person fire overlay moves, as a fraction of its height.
+    pub fire_lower: f32,
+    /// Lava's fog as with Fire Resistance, without the effect.
+    pub clear_lava: bool,
+    /// Water's fog as after 30 seconds under water, from the first moment.
+    pub clear_water: bool,
+    pub chat: Chat,
+    /// The status effect icons at the top right are left out (a crate shows the effects itself).
+    pub hide_effect_icons: bool,
+    /// The time of day this player sees, as `/time set` takes it (0 to 23999); `None` for the
+    /// world's. Only what is drawn follows it, never what plays by the world's time.
+    pub time_of_day: Option<i64>,
+    /// The rain and thunder levels this player sees (0 to 1); `None` for the world's.
+    pub weather: Option<(f32, f32)>,
+}
+impl Default for Look {
+    fn default() -> Self {
+        Self {
+            legacy_pose: false,
+            hide_attack_indicator: false,
+            mute_attack_sounds: false,
+            hide_attack_particles: false,
+            frame: Frame::default(),
+            shield_size: 100,
+            totem_scale: 1.0,
+            fire_lower: 0.0,
+            clear_lava: false,
+            clear_water: false,
+            chat: Chat::default(),
+            hide_effect_icons: false,
+            time_of_day: None,
+            weather: None,
+        }
+    }
+}
+impl Look {
+    /// Whether the sound `name` a server sent is left out ([`Look::mute_attack_sounds`]).
+    pub fn mutes_sound(&self, name: &str) -> bool {
+        let name = name.strip_prefix("minecraft:").unwrap_or(name);
+        self.mute_attack_sounds && name.starts_with("entity.player.attack.")
+    }
+    /// The day time drawn while the world's is `world`: the same day (the moon's phase follows the
+    /// world's), at [`Look::time_of_day`].
+    pub fn day_time(&self, world: i64) -> i64 {
+        match self.time_of_day {
+            Some(t) => world.div_euclid(24000) * 24000 + t,
+            None => world,
+        }
+    }
+}
+
+/// What the renderer reads each frame.
+#[non_exhaustive]
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct Frame {
+    /// The block outline's colour (`0xAARRGGBB`) and its stroke's scale; `None` for vanilla's.
+    pub outline: Option<(u32, f32)>,
+    /// The hurt overlay's texel, 0 for vanilla's.
+    pub hurt_texel: u32,
+    /// The enchantment glint's texel (RGB bytes then 0xFF, `unpack4x8unorm`'s order), 0 for
+    /// vanilla's.
+    pub glint: u32,
+}
+
+/// The chat's extras. Each is off in vanilla.
+#[non_exhaustive]
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub struct Chat {
+    /// The local time before each message.
+    pub timestamps: bool,
+    /// A message repeated in a row shows once with its count.
+    pub compact: bool,
+    /// A click on a message (where it has no click action) copies it.
+    pub copy: bool,
+    /// Ctrl+F in the chat searches its messages.
+    pub search: bool,
+}
+
+/// Each seat's look; a seat that never set one has vanilla's.
+static LOOKS: Mutex<Vec<Look>> = Mutex::new(Vec::new());
+
+/// Changes the look of the player whose turn it is: `change` sets the fields its crate owns and
+/// leaves the others' be.
+pub fn update(change: impl FnOnce(&mut Look)) {
+    let mut looks = LOOKS.lock().unwrap_or_else(|e| e.into_inner());
+    let seat = crate::seat();
+    if looks.len() <= seat {
+        looks.resize(seat + 1, Look::default());
+    }
+    change(&mut looks[seat]);
+}
+
+/// The engine's side. Only the engine calls it.
+pub mod engine {
+    use super::*;
+
+    /// The look of the player whose turn it is: vanilla's until something set one.
+    pub fn get() -> Look {
+        let looks = LOOKS.lock().unwrap_or_else(|e| e.into_inner());
+        looks.get(crate::seat()).copied().unwrap_or_default()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn each_seat_sees_its_own_look_and_vanillas_until_set() {
+        // Seats no other test plays, as the looks are shared.
+        crate::engine::set_seat(5);
+        assert_eq!(engine::get(), Look::default());
+        update(|look| look.legacy_pose = true);
+        // Another crate's change keeps the first one's.
+        update(|look| look.clear_water = true);
+        let look = engine::get();
+        assert!(look.legacy_pose && look.clear_water);
+        crate::engine::set_seat(4);
+        assert_eq!(engine::get(), Look::default());
+        crate::engine::set_seat(0);
+    }
+
+    #[test]
+    fn attack_sounds_go_only_when_muted() {
+        let mut look = Look::default();
+        let attacks = [
+            "minecraft:entity.player.attack.strong",
+            "entity.player.attack.sweep",
+            "minecraft:entity.player.attack.nodamage",
+        ];
+        assert!(!attacks.iter().any(|name| look.mutes_sound(name)));
+        look.mute_attack_sounds = true;
+        assert!(attacks.iter().all(|name| look.mutes_sound(name)));
+        // 1.8.9 had the hurt sound: it stays.
+        assert!(!look.mutes_sound("minecraft:entity.player.hurt"));
+    }
+
+    #[test]
+    fn a_fixed_time_keeps_the_worlds_day() {
+        // Day 9 at 5000: the moon's phase (the day number) stays, the time of day is the chosen.
+        let world = 9 * 24000 + 5000;
+        let mut look = Look::default();
+        assert_eq!(look.day_time(world), world);
+        look.time_of_day = Some(18000);
+        assert_eq!(look.day_time(world), 9 * 24000 + 18000);
+        look.time_of_day = Some(6000);
+        assert_eq!(look.day_time(-100), -24000 + 6000);
+    }
+}

crates/horizon-platform/src/lib.rs

@@ -46,7 +46,7 @@ pub use horizon_server_files as server_files;
 /// [`hooks::register`] it before the game starts (docs/layers.md, "How a Horizon crate plugs
 /// in"). The engine's dispatch side is not part of the API.
 pub mod hooks {
-    pub use horizon_hooks::{Hooks, Started, TooLate, register};
+    pub use horizon_hooks::{Hooks, Started, TooLate, register, seat};
 }
 
 /// The settings store (`horizon_hooks::settings`): a crate's own `key:value` lines in the game
@@ -60,6 +60,18 @@ pub mod pages {
     pub use horizon_hooks::pages::{Act, Label, Page, Place, Row, register};
 }
 
+/// How the game draws a few things a crate may change, per player (`horizon_hooks::look`):
+/// vanilla's until set.
+pub mod look {
+    pub use horizon_hooks::look::{Chat, Frame, Look, update};
+}
+
+/// Input and drawing on an open container screen (docs/layers.md, "Container screens"): the
+/// `container_*` methods of [`hooks::Hooks`] get the screen as a [`containers::Container`].
+pub mod containers {
+    pub use horizon_hooks::containers::{Click, Container, Role, Slot, SlotId, Stack};
+}
+
 /// Drawing on the HUD (docs/layers.md, "Platform registries").
 pub mod hud {
     pub use horizon_hooks::hud::{Canvas, Corner, Layer, register};

docs/extras.md

@@ -14,9 +14,9 @@ again restores vanilla's behaviour completely.
 | Dynamic lights: item glow, nearest sources | `crates/horizon-client-render/src/dynamic_light.rs` (unit tested), `game/dynamic_lights.rs`, `terrain.wgsl` and `entity.wgsl` (`dynamic_block_light`) |
 | HUD drawing (a native mod's minimap, corner stacking) | `crates/horizon-client/src/extras_hud.rs` |
 | Minimap colours, tiles and image (for the Minimap native mod) | `crates/horizon-client-render/src/minimap.rs` |
-| Reconnect policy and backoff | `crates/horizon-client/src/reconnect.rs` |
-| Game glue (input hooks, per-frame update) | `crates/horizon-client/src/game/extras.rs` |
-| Mouse Tweaks-style controls, sort buttons | `crates/horizon-client/src/game/tweaks.rs` |
+| Reconnect policy and backoff | `crates/horizon-client/src/reconnect.rs`, a hook on the engine's connection lifecycle (`horizon_hooks`: `connecting`, `joined`, `left`, `ended`), registered in `entry.rs`; the engine shows and runs the attempt it plans (`last_server.rs`, `game/world_session.rs`); `game/extras/reconnect.rs` hands it the setting |
+| Game glue (input hooks, per-frame update) | `crates/horizon-client/src/game/extras.rs`; each extra's own glue in a child module, `game/extras/` |
+| Mouse Tweaks-style controls, sort buttons | `crates/horizon-client/src/game/extras/mouse_tweaks.rs`, `game/extras/sorting.rs` |
 | Sort order and its clicks | `crates/horizon-client/src/inv_sort.rs` (pure, unit tested) |
 | The music page's rows, and the pools it filters | `options_ui.rs` (`Page::Music`), `crates/horizon-client/src/music.rs` (`track_groups`, `MusicManager::set_off`), `sound_events.rs` (`sound_except`) |
 | Cosmetics (show mine, show others'), off with their flag | `extras.rs`, `crates/horizon-client/src/game/cosmetics.rs` ([cosmetics.md](cosmetics.md)) |

docs/forking.md

@@ -23,7 +23,7 @@ What changes in that build:
 |---|---|---|
 | Cosmetics, emotes and the emote wheel, "Show me as a Horizon player" | `game/cosmetics.rs` (+ `cosmetics/fx.rs`, `cosmetics/emotes.rs`, `cosmetics/emote_wheel.rs`), crate `horizon-cosmetics` | `game::cosmetics::enabled()`: the service is never asked, nothing is drawn, B opens no wheel |
 | The official server added to the server list | `multiplayer.rs` (`add_official_server`) | their call at startup (`game.rs`, `fn run`) |
-| Horizon Settings (Extras, PvP & HUD, Splitscreen, Studio, AI Agent, Discord) and Mods (with the registry browser) | `options_ui.rs` (`Page::Horizon` and below), `extras_ui.rs`, `extras.rs`, `pvp.rs`, `game/extras.rs`, `game/tweaks.rs`, `extras_hud.rs` | the Options screen shows vanilla's greyed Telemetry Data instead (`options_ui::HORIZON_EXTRAS`, set in `entry.rs`) |
+| Horizon Settings (Extras, PvP & HUD, Splitscreen, Studio, AI Agent, Discord) and Mods (with the registry browser) | `options_ui.rs` (`Page::Horizon` and below), `extras_ui.rs`, `extras.rs`, `pvp.rs`, `game/extras.rs` and `game/extras/`, `extras_hud.rs` | the Options screen shows vanilla's greyed Telemetry Data instead (`options_ui::HORIZON_EXTRAS`, set in `entry.rs`) |
 | Discord Rich Presence | `discord_presence.rs`, `game/discord.rs` | the `discord` feature, which `horizon-extras` turns on |
 | Play with Friends | `game/friends.rs`, `friends_screen.rs`, crate `horizon-friends` | the `friends` feature (`game/friends_off.rs` stands in) |
 | The anonymous "I'm playing" ping | crate `horizon-heartbeat` | not in horizon-client at all: only the official executable (`horizon-official`) registers it ([layers.md](layers.md#how-a-horizon-crate-plugs-in)) |

docs/layers.md

@@ -157,7 +157,7 @@ Horizon's own extras and its product, and every built-in address of an outside s
 - **Examples:** `horizon-addresses`, `horizon-cosmetics`, `horizon-friends`, `horizon-relay`, `horizon-telemetry`,
   `horizon-bench`, `horizon-release-sign`, `horizon-server`, `horizon-mod-registry`, `horizon-heartbeat`,
   `horizon-official`, `launcher/`. Still in engine crates today: `game/cosmetics.rs`, `game/emotes.rs`,
-  `game/discord.rs`, `game/extras.rs`, `game/tweaks.rs`, `multiplayer.rs` (`add_official_server`), `extras_ui.rs`,
+  `game/discord.rs`, `game/extras.rs` and `game/extras/`, `multiplayer.rs` (`add_official_server`), `extras_ui.rs`,
   `pvp.rs`.
 - **Rules:**
   - It uses the platform's public API only, never the engine.
@@ -287,8 +287,12 @@ otherwise, and must return quickly. With nothing registered a dispatch is one lo
 build pays nothing.
 
 The hooks today: `started` (once, when someone plays: not a dedicated server, a benchmark or an automated run),
-`published` (the world opened to or closed from LAN or friends, on change) and `shutdown` (the window closed, the
-world saved). **A hook you need and don't find:** add a method with an empty default to `Hooks` and a function in
+`published` (the world opened to or closed from LAN or friends, on change), `shutdown` (the window closed, the
+world saved), and a multiplayer connection's lifecycle: `connecting` (address, player name, LAN), `joined`, `left` (on
+purpose) and `ended` (reason, its translation key, whether the server sent it). `ended` may return a `Reconnect`
+(address, name, LAN, when, attempt of attempts): the engine shows its countdown on the Disconnected screen, with
+Cancel, and connects when it is due; every hook hears the end and the first plan wins. Auto-reconnect is built on
+them (`reconnect.rs`); the engine keeps the last server itself (`last_server.rs`). **A hook you need and don't find:** add a method with an empty default to `Hooks` and a function in
 `horizon_hooks::engine` that the engine calls where vanilla does the matching thing; give it plain data or a type
 the engine owns, never one from above. A hook that needs engine types the platform doesn't expose yet (a draw
 context for HUD and chat overlays, a settings page) comes with that type's platform API (M6). An extension point

docs/pvp.md

@@ -21,7 +21,8 @@ Each feature is built from what it visibly does, never from another client's or
 |---|---|
 | Settings, parsing, the page's rows | `crates/horizon-client-render/src/pvp.rs` (stored in `horizon-extras.txt`, see [extras.md](extras.md)) |
 | The page | `options_ui.rs` (`Page::Pvp`), the rows of `pvp::rows()` drawn like the Extras page |
-| Game glue | `crates/horizon-client/src/game/pvp.rs` |
+| Game glue | `crates/horizon-client/src/game/extras/pvp.rs` |
+| What the engine draws differently | `horizon_hooks::look` (`Look`, PvP & HUD's fields set each frame from the options by `Pvp::apply`); the engine reads it only in `game/look.rs` |
 
 ## Crosshair (`crosshair`, default off)
 
@@ -53,7 +54,7 @@ Each feature is built from what it visibly does, never from another client's or
 
 Boxes in the screen corners, placed like the minimap and mods' boxes (`extras_hud::Corners`), each in a corner of
 its own, with an optional dark background (on by default). F3's debug screen takes the top corners as it does from
-mods' boxes. Code: `crates/horizon-client-render/src/pvp_hud.rs` (lines, cache, layout) and `game/pvp.rs`.
+mods' boxes. Code: `crates/horizon-client-render/src/pvp_hud.rs` (lines, cache, layout) and `game/extras/pvp.rs`.
 
 - **Armour** (bottom right): each piece worn, head first, with the uses left as a number or a percent, coloured
   like the item's durability bar (green to red). Only what the inventory already shows.
@@ -136,7 +137,7 @@ There is no "no hurt camera" option: vanilla's Accessibility → Damage Tilt alr
 
 The time of day (morning, noon, sunset, midnight) and the weather (clear, rain, thunder) this player sees. Only
 the frame changes: the sky's colours, sun, moon and stars, the sky's light in the lightmap, the rain and its
-fog (`Game::view_day_time`, `Game::view_weather` in `game/pvp.rs`). The world's `day_time` and weather, and all
+fog (`Game::view_day_time`, `Game::view_weather` in `game/look.rs`). The world's `day_time` and weather, and all
 that plays by them (mobs, crops, beds, riptide, rain sounds), stay the server's, and nothing is sent to it.
 The moon keeps the world's phase. Only a client of a server draws it (single player's window is one), in the
 Overworld.