Friends reads its code while the screen is drawn, as before

The invite code and the host's events are polled while the Friends screen
is drawn or horizon-ctl friends status asks, as on main: Hooks::share stays
dispatched for the screen's page (#14167 step 2a), which is its first user.

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` + `extras/` (each extra's glue: `mouse_tweaks.rs`, `sorting.rs`, `pvp.rs`, `reconnect.rs`), `options.rs` |
+| Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs`, `tweaks.rs`, `options.rs` |
 
 ## How `Game` is organised
 

Cargo.lock

@@ -1418,6 +1418,7 @@ dependencies = [
 name = "horizon-chat-filter"
 version = "0.1.0"
 dependencies = [
+ "horizon-server-files",
  "serde",
  "serde_json",
  "toml",
@@ -1528,7 +1529,6 @@ dependencies = [
  "horizon-client-render",
  "horizon-command",
  "horizon-core",
- "horizon-friends",
  "horizon-hdr",
  "horizon-hooks",
  "horizon-items",
@@ -1592,7 +1592,6 @@ dependencies = [
  "horizon-optifine",
  "horizon-polytone",
  "horizon-protocol",
- "horizon-render-pipeline",
  "horizon-shader-api",
  "horizon-shaders",
  "horizon-system",
@@ -1668,6 +1667,7 @@ dependencies = [
  "getrandom 0.3.4",
  "hkdf",
  "horizon-addresses",
+ "horizon-platform",
  "if-addrs",
  "serde",
  "serde_json",
@@ -1793,6 +1793,7 @@ dependencies = [
 name = "horizon-official"
 version = "0.1.0"
 dependencies = [
+ "horizon-friends",
  "horizon-game",
  "horizon-heartbeat",
  "horizon-platform",
@@ -1891,10 +1892,6 @@ dependencies = [
  "ring",
 ]
 
-[[package]]
-name = "horizon-render-pipeline"
-version = "0.1.0"
-
 [[package]]
 name = "horizon-server"
 version = "0.1.0"
@@ -1957,7 +1954,6 @@ version = "0.1.0"
 dependencies = [
  "half",
  "horizon-core",
- "horizon-render-pipeline",
  "naga",
  "png",
  "zip",

Cargo.toml

@@ -43,7 +43,6 @@ members = [
     "crates/cargo-horizon-mod",
     "crates/horizon-port-pack",
     "crates/horizon-shaders",
-    "crates/horizon-render-pipeline",
     "crates/horizon-optifine",
     "crates/horizon-polytone",
     "crates/horizon-shader-api",

crates/horizon-chat-filter/Cargo.toml

@@ -7,6 +7,8 @@ rust-version.workspace = true
 description = "The dedicated server's chat filter: its [chat_filter] settings, the slur list's matcher and the mutes, with no game state (docs/chat-filter.md)"
 
 [dependencies]
+# The moderation durations, shared with `/tempban`.
+horizon-server-files = { path = "../horizon-server-files" }
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 toml = "1.1"

crates/horizon-chat-filter/src/lib.rs

@@ -10,6 +10,9 @@ use std::path::{Path, PathBuf};
 
 mod normalise;
 
+pub use horizon_server_files::duration::{
+    DurationUnit, duration_parts, duration_text, now_millis, parse_duration,
+};
 pub use normalise::{Run, Text};
 
 /// The list built into the game, used when `words_file` is empty.
@@ -474,61 +477,6 @@ pub fn append_log(path: &Path, line: &str) -> std::io::Result<()> {
     writeln!(f, "{line}")
 }
 
-/// `/tempmute`'s duration in milliseconds: a positive whole number and a unit, `s`, `m`, `h`, `d` or
-/// `w` (`10m`, `2h`, `1d`).
-pub fn parse_duration(text: &str) -> Option<i64> {
-    let unit = match text.chars().last()? {
-        's' => 1_000,
-        'm' => MINUTE,
-        'h' => 60 * MINUTE,
-        'd' => 24 * 60 * MINUTE,
-        'w' => 7 * 24 * 60 * MINUTE,
-        _ => return None,
-    };
-    let count: i64 = text[..text.len() - 1].parse().ok()?;
-    (count > 0).then(|| count.checked_mul(unit)).flatten()
-}
-
-/// The unit used when presenting a moderation duration to a player.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum DurationUnit {
-    Minute,
-    Hour,
-    Day,
-}
-
-/// A duration's rounded count and unit, shared by logs and translated replies.
-pub fn duration_parts(millis: i64) -> (i64, DurationUnit) {
-    let (unit, kind) = if millis <= 60 * MINUTE {
-        (MINUTE, DurationUnit::Minute)
-    } else if millis <= 48 * 60 * MINUTE {
-        (60 * MINUTE, DurationUnit::Hour)
-    } else {
-        (24 * 60 * MINUTE, DurationUnit::Day)
-    };
-    (
-        millis.div_euclid(unit) + i64::from(millis.rem_euclid(unit) > 0),
-        kind,
-    )
-}
-
-/// `millis` for logs, rounded up: minutes up to an hour, hours up to two days, then days.
-pub fn duration_text(millis: i64) -> String {
-    let (count, unit) = duration_parts(millis);
-    let unit = match unit {
-        DurationUnit::Minute => "minute",
-        DurationUnit::Hour => "hour",
-        DurationUnit::Day => "day",
-    };
-    format!("{count} {unit}{}", if count == 1 { "" } else { "s" })
-}
-
-pub fn now_millis() -> i64 {
-    std::time::SystemTime::now()
-        .duration_since(std::time::UNIX_EPOCH)
-        .map_or(0, |d| d.as_millis() as i64)
-}
-
 /// `YYYY-MM-DDTHH:MM:SSZ` for epoch milliseconds.
 pub fn utc(millis: i64) -> String {
     let secs = millis.div_euclid(1000);

crates/horizon-client-input/src/window.rs

@@ -670,6 +670,39 @@ pub fn with_horizon_icon(
     attributes
 }
 
+/// The screen a window is on: its size in physical pixels, its refresh rate where the OS gives
+/// it, and its scale. For `horizon-ctl status` and the performance statistics' `system.display`.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Display {
+    pub width: u32,
+    pub height: u32,
+    pub refresh_hz: Option<u32>,
+    pub scale: f64,
+}
+
+/// The screen `window` is on, else the primary one, else the only one: right after the window
+/// is made, Wayland doesn't say yet which screen it is on.
+pub fn monitor(window: &winit::window::Window) -> Option<winit::monitor::MonitorHandle> {
+    let only = || {
+        let mut all = window.available_monitors();
+        all.next().filter(|_| all.next().is_none())
+    };
+    window
+        .current_monitor()
+        .or_else(|| window.primary_monitor())
+        .or_else(only)
+}
+
+/// [`monitor`]'s size, refresh rate and scale.
+pub fn display(window: &winit::window::Window) -> Option<Display> {
+    monitor(window).map(|m| Display {
+        width: m.size().width,
+        height: m.size().height,
+        refresh_hz: m.refresh_rate_millihertz().map(|r| r.div_ceil(1000)),
+        scale: m.scale_factor(),
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/horizon-client-lib/Cargo.toml

@@ -42,8 +42,6 @@ horizon-chat-filter = { path = "../horizon-chat-filter" }
 horizon-shaders = { path = "../horizon-shaders" }
 # Horizon's own shader packs: the format, the stages and the check (docs/shaders.md).
 horizon-shader-api = { path = "../horizon-shader-api" }
-# Play with Friends: invite codes and their tunnel; the `friends` feature.
-horizon-friends = { path = "../horizon-friends", optional = true }
 # The narrator (GameNarrator): text-to-speech of chat, system messages and screens.
 horizon-narrator = { path = "../horizon-narrator" }
 # Horizon mods: sandboxed WebAssembly components, off unless installed and turned on (docs/mods.md).
@@ -111,16 +109,17 @@ objc2-foundation = { version = "0.3", default-features = false, features = ["std
 wgpu = { version = "30.0.1", default-features = false, features = ["gles"] }
 
 [features]
-default = ["audio", "controllers", "discord", "friends"]
+default = ["audio", "controllers", "horizon-extras"]
 # Sound output. Without it (and `controllers`) the program links neither libasound nor libudev on
 # Linux: the server build (`--no-default-features`, released as horizon-engine; docs/server.md).
 audio = ["horizon-client-render/audio"]
 # Controllers: gilrs, and the DualSense's own output. Without it only `horizon-ctl pad`'s virtual pad.
 controllers = ["dep:gilrs", "horizon-client-input/controllers"]
+# Horizon's own parts (docs/forking.md, docs/layers.md): the features below, and the official
+# server in the list (`official_servers`).
+horizon-extras = ["discord"]
 # "Playing Horizon" on the player's Discord profile (`discord_presence`).
 discord = []
-# Play with Friends, joining side (`net.rs`): without it no invite code joins.
-friends = ["dep:horizon-friends"]
 # Records the call sites of mob random draws (`mob_ai_probe` traces).
 rng-trace = ["horizon-core/rng-trace"]
 # Compatibility with earlier experiment commands: main already uses mimalloc.

crates/horizon-client-render/Cargo.toml

@@ -26,7 +26,6 @@ horizon-narrator = { path = "../horizon-narrator" }
 horizon-optifine = { path = "../horizon-optifine" }
 horizon-polytone = { path = "../horizon-polytone" }
 horizon-protocol = { path = "../horizon-protocol" }
-horizon-render-pipeline = { path = "../horizon-render-pipeline" }
 horizon-shader-api = { path = "../horizon-shader-api" }
 horizon-shaders = { path = "../horizon-shaders" }
 horizon-system = { path = "../horizon-system" }

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,
-        look: Default::default(),
+        pvp: 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,
-        look: Default::default(),
+        pvp: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

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

@@ -121,8 +121,8 @@ impl CommandBlock {
             condition_met: flag("conditionMet", false),
         }
     }
-    /// `CommandBlockEntity.saveAdditional`. The last output is written as a
-    /// plain string component.
+    /// `CommandBlockEntity.saveAdditional`. The last output is the component
+    /// itself (`ComponentSerialization.CODEC`), styles and click events kept.
     pub fn save(&self) -> Vec<(&'static str, Tag)> {
         let mut out = vec![
             ("Command", Tag::String(self.command.as_str().into())),
@@ -135,7 +135,7 @@ impl CommandBlock {
         if self.track_output
             && let Some(last) = &self.last_output
         {
-            out.push(("LastOutput", Tag::String(last.plain().as_str().into())));
+            out.push(("LastOutput", scoreboard::component_tag(&last.component())));
         }
         out.push((
             "UpdateLastExecution",

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

@@ -1,27 +1,34 @@
-//! OptiFine custom skies (`horizon_optifine::sky`) as the game draws them: a pack's layers with
-//! their decoded textures, read once with the pack, and each frame's choice of layers, their
-//! brightness and rotation ([`CustomSky::draws`]), which `gfx::custom_sky` draws over the
-//! vanilla sky. A pack without `optifine/sky` gives an empty [`CustomSky`] and the sky stays
-//! vanilla.
+//! Custom sky layers: skyboxes a pack draws over the vanilla sky, in a format vanilla doesn't read
+//! (OptiFine's), which the platform's pack formats fill ([`crate::pack_hooks`]). The layers'
+//! textures are read once with the pack; each frame the game asks for the layers to draw, their
+//! brightness and rotation ([`SkyLayers::draws`]), and `gfx::custom_sky` draws them over the
+//! vanilla sky. A pack without layers keeps the vanilla sky.
 
 use std::path::Path;
+use std::sync::Arc;
 
-use glam::{Mat4, Vec3};
-use horizon_optifine::sky::{Blend, Conditions, Skies, SkyLayer, Transition};
+use glam::Mat4;
 
-/// A layer's texture, RGBA8.
+/// A layer's texture, RGBA8: the skybox's six faces in a 3x2 grid, bottom, top and south in the
+/// top row, west, north and east below (`gfx::custom_sky`'s faces).
 pub struct Image {
     pub width: u32,
     pub height: u32,
     pub rgba: Vec<u8>,
 }
 
-/// The pack's layers, by world, with one texture per layer (`images[i]` for the `i`th layer
-/// over all worlds, in `worlds` order).
-#[derive(Default)]
-pub struct CustomSky {
-    worlds: Vec<(i32, Vec<SkyLayer>)>,
-    pub images: Vec<Image>,
+/// How a layer mixes with what is drawn below it.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Blend {
+    Add,
+    Subtract,
+    Multiply,
+    Dodge,
+    Burn,
+    Screen,
+    Replace,
+    Overlay,
+    Alpha,
 }
 
 /// One layer of a frame: which texture, with which blend, how bright and turned how.
@@ -34,62 +41,44 @@ pub struct Draw {
     pub rotation: Mat4,
 }
 
+/// The weather of a frame: thunder is a storm's rain, so it is only `Thunder`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Weather {
+    Clear,
+    Rain,
+    Thunder,
+}
+
+/// What a frame's layers may depend on.
+#[derive(Clone, Copy, Debug)]
+pub struct Conditions<'a> {
+    /// Ticks of the day, counting the days.
+    pub day_time: i64,
+    pub weather: Weather,
+    /// The biome at the camera, namespaced.
+    pub biome: &'a str,
+    /// The camera's block height.
+    pub y: i32,
+}
+
 /// The eased brightness of each layer, kept by the game between frames.
 #[derive(Default)]
 pub struct State {
-    world: Option<i32>,
-    eased: Vec<Transition>,
+    /// The world the layers were last drawn for.
+    pub world: Option<i32>,
+    /// Each layer's eased visibility, 0 to 1.
+    pub eased: Vec<f32>,
 }
 
-/// Textures past this many texels in all are left out (a skybox is a few megapixels at most).
-const TEXEL_BUDGET: u64 = 64 << 20;
-
-impl CustomSky {
-    /// The custom skies of the overlay at `root`. A layer whose texture does not decode is
-    /// dropped with a warning.
-    pub fn load(root: &Path) -> Self {
-        let skies = Skies::scan(root);
-        let mut out = Self::default();
-        let mut texels = 0u64;
-        for (world, sky) in skies.worlds {
-            let mut layers = Vec::new();
-            for layer in sky.layers {
-                match crate::hud::decode(&root.join(&layer.source)) {
-                    Ok((width, height, rgba))
-                        if texels + u64::from(width) * u64::from(height) <= TEXEL_BUDGET =>
-                    {
-                        texels += u64::from(width) * u64::from(height);
-                        out.images.push(Image {
-                            width,
-                            height,
-                            rgba,
-                        });
-                        layers.push(layer);
-                    }
-                    Ok(_) => log::warn!("{}: past the custom sky's texture budget", layer.source),
-                    Err(e) => log::warn!("{}: {e:#}", layer.source),
-                }
-            }
-            if !layers.is_empty() {
-                out.worlds.push((world, layers));
-            }
-        }
-        out
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.worlds.is_empty()
-    }
-
-    /// Whether `world` has layers (`0` the Overworld, `1` the End).
-    pub fn has(&self, world: i32) -> bool {
-        self.worlds.iter().any(|(w, _)| *w == world)
-    }
-
-    /// This frame's layers of `world` into `out` (cleared first), in drawing order: those whose
-    /// conditions hold, eased over their `transition` by `seconds` since the last frame, at the
-    /// brightness of their fade times. `sun_turns` is the sun's angle over 360° (`0` at noon).
-    pub fn draws(
+/// A pack's custom sky layers, by world (`0` the Overworld, `1` the End).
+pub trait SkyLayers: Send + Sync {
+    /// Every layer's texture: [`Draw::image`] indexes it.
+    fn images(&self) -> &[Image];
+    /// Whether `world` has layers.
+    fn has(&self, world: i32) -> bool;
+    /// This frame's layers of `world` into `out` (cleared first), in drawing order, eased by
+    /// `seconds` since the last frame. `sun_turns` is the sun's angle over 360° (`0` at noon).
+    fn draws(
         &self,
         world: i32,
         conditions: &Conditions,
@@ -97,147 +86,30 @@ impl CustomSky {
         seconds: f32,
         state: &mut State,
         out: &mut Vec<Draw>,
-    ) {
+    );
+}
+
+/// No layers: the vanilla sky.
+struct NoLayers;
+
+impl SkyLayers for NoLayers {
+    fn images(&self) -> &[Image] {
+        &[]
+    }
+
+    fn has(&self, _: i32) -> bool {
+        false
+    }
+
+    fn draws(&self, _: i32, _: &Conditions, _: f32, _: f32, s: &mut State, out: &mut Vec<Draw>) {
         out.clear();
-        let mut first = 0;
-        let mut found = None;
-        for (w, layers) in &self.worlds {
-            if *w == world {
-                found = Some(layers);
-                break;
-            }
-            first += layers.len();
-        }
-        let Some(layers) = found else {
-            state.world = None;
-            return;
-        };
-        // A new world (or pack) starts each layer where its conditions put it: no fade in.
-        let snap = state.world != Some(world) || state.eased.len() != layers.len();
-        if snap {
-            state.world = Some(world);
-            state.eased.clear();
-            state.eased.resize(layers.len(), Transition::default());
-        }
-        for (i, (layer, eased)) in layers.iter().zip(&mut state.eased).enumerate() {
-            let target = if layer.shows(conditions) { 1.0 } else { 0.0 };
-            let shown = if snap {
-                eased.value = target;
-                target
-            } else {
-                eased.step(target, seconds, layer.transition)
-            };
-            let brightness = shown * layer.brightness(conditions.day_time);
-            if brightness <= 0.0 {
-                continue;
-            }
-            let turns = layer.turns(conditions.day_time, sun_turns);
-            let rotation = if turns == 0.0 {
-                Mat4::IDENTITY
-            } else {
-                Mat4::from_axis_angle(Vec3::from_array(layer.axis), turns * std::f32::consts::TAU)
-            };
-            out.push(Draw {
-                image: (first + i) as u16,
-                blend: layer.blend,
-                brightness,
-                rotation,
-            });
-        }
+        s.world = None;
     }
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use horizon_optifine::sky::Now;
-
-    fn pack(files: &[(&str, &str)]) -> (std::path::PathBuf, CustomSky) {
-        let root = std::env::temp_dir().join(format!(
-            "horizon-custom-sky-{}-{}",
-            std::process::id(),
-            files.len()
-        ));
-        let _ = std::fs::remove_dir_all(&root);
-        let dir = root.join("assets/minecraft/optifine/sky/world0");
-        std::fs::create_dir_all(&dir).unwrap();
-        let png = {
-            let mut bytes = Vec::new();
-            let mut encoder = png::Encoder::new(&mut bytes, 6, 4);
-            encoder.set_color(png::ColorType::Rgba);
-            encoder.set_depth(png::BitDepth::Eight);
-            let mut writer = encoder.write_header().unwrap();
-            writer
-                .write_image_data(&[255, 0, 0, 255].repeat(24))
-                .unwrap();
-            writer.finish().unwrap();
-            bytes
-        };
-        for (name, text) in files {
-            std::fs::write(dir.join(format!("{name}.properties")), text).unwrap();
-            std::fs::write(dir.join(format!("{name}.png")), &png).unwrap();
-        }
-        let sky = CustomSky::load(&root);
-        (root, sky)
-    }
-
-    fn noon(biome: &str) -> Conditions<'_> {
-        Conditions {
-            day_time: 6000,
-            weather: Now::Clear,
-            biome,
-            y: 64,
-        }
-    }
-
-    #[test]
-    fn layers_ease_in_at_a_biome_border_but_not_on_arrival() {
-        let (root, sky) = pack(&[
-            ("sky1", "biomes=desert\ntransition=2"),
-            ("sky2", "blend=alpha\nrotate=false"),
-        ]);
-        let _ = std::fs::remove_dir_all(root);
-        assert!(sky.has(0) && !sky.has(1));
-        assert_eq!(sky.images[0].width, 6);
-        let (mut state, mut out) = (State::default(), Vec::new());
-        sky.draws(
-            0,
-            &noon("minecraft:desert"),
-            0.0,
-            0.05,
-            &mut state,
-            &mut out,
-        );
-        assert_eq!(
-            out.iter().map(|d| d.brightness).collect::<Vec<_>>(),
-            [1.0, 1.0]
-        );
-        // Out of the desert: the first layer fades over its two seconds.
-        sky.draws(0, &noon("minecraft:plains"), 0.0, 0.5, &mut state, &mut out);
-        assert_eq!(out[0].brightness, 0.75);
-        assert_eq!(out[1].blend, Blend::Alpha);
-        sky.draws(0, &noon("minecraft:plains"), 0.0, 2.0, &mut state, &mut out);
-        assert_eq!(out.len(), 1, "a dark layer is not drawn");
-        assert_eq!(out[0].image, 1);
-        // Into the End, which has no layers, and back: no fade.
-        sky.draws(1, &noon("minecraft:desert"), 0.0, 0.0, &mut state, &mut out);
-        assert!(out.is_empty());
-        sky.draws(0, &noon("minecraft:desert"), 0.0, 0.0, &mut state, &mut out);
-        assert_eq!(out.len(), 2);
-    }
-
-    #[test]
-    fn a_layer_turns_west_like_the_sun() {
-        let (root, sky) = pack(&[("sky1", "")]);
-        let _ = std::fs::remove_dir_all(root);
-        let (mut state, mut out) = (State::default(), Vec::new());
-        // A quarter turn after noon (sunset): the skybox's zenith has gone down to the west.
-        let c = Conditions {
-            day_time: 12000,
-            ..noon("minecraft:plains")
-        };
-        sky.draws(0, &c, 0.25, 0.0, &mut state, &mut out);
-        let up = out[0].rotation.transform_vector3(Vec3::Y);
-        assert!((up - Vec3::NEG_X).length() < 1e-5, "{up}");
-    }
+/// The custom sky layers of the overlay at `root`, from the installed pack formats.
+pub fn load(root: &Path) -> Arc<dyn SkyLayers> {
+    crate::pack_hooks::formats()
+        .custom_sky(root)
+        .unwrap_or_else(|| Arc::new(NoLayers))
 }

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 outline, hurt overlay and glint colours a crate above set (`horizon_hooks::look`).
-    pub look: horizon_hooks::look::Frame,
+    /// The PvP & HUD page's outline and hit colour (`pvp::Frame`; default: vanilla's).
+    pub pvp: crate::pvp::Frame,
     /// `lines` with a colour and pixel width (`gizmos::camera_relative`):
     /// the fishing line and debug gizmos, depth tested, then gizmos drawn
     /// over everything.
@@ -1329,7 +1329,7 @@ pub struct Renderer {
     celestial_buffer: wgpu::Buffer,
     end_sky: end_sky::EndSky,
     stars: stars::Stars,
-    /// OptiFine custom sky layers (`crate::custom_sky`), and the frame's from the game.
+    /// Custom sky layers (`crate::custom_sky`), and the frame's from the game.
     custom_sky: custom_sky::CustomSky,
     custom_sky_draws: Vec<crate::custom_sky::Draw>,
     /// The glowing entities' outline (`LevelRenderer.entityOutlineTarget`).
@@ -5517,11 +5517,11 @@ impl Renderer {
             ))
         });
     }
-    /// The pack's OptiFine custom sky layer textures (`crate::custom_sky::CustomSky::load`).
-    pub fn set_custom_sky(&mut self, pack: &crate::custom_sky::CustomSky) {
+    /// The pack's custom sky layer textures (`crate::custom_sky::load`).
+    pub fn set_custom_sky(&mut self, pack: &dyn crate::custom_sky::SkyLayers) {
         self.custom_sky.set_pack(&self.device, &self.queue, pack);
     }
-    /// The custom sky layers the next frame draws (`CustomSky::draws`): the game refills it each
+    /// The custom sky layers the next frame draws (`SkyLayers::draws`): the game refills it each
     /// frame, empty when the world's sky has none.
     pub fn custom_sky_draws(&mut self) -> &mut Vec<crate::custom_sky::Draw> {
         &mut self.custom_sky_draws
@@ -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.look.hurt_texel,
+                frame.pvp.hurt_texel,
                 // PvP & HUD's glint colour: entity.wgsl's `tinted_glint`, 0 for vanilla's.
-                frame.look.glint,
+                frame.pvp.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.look.outline.map_or((None, 1.0), |o| (Some(o.0), o.1));
+            let (custom, scale) = frame.pvp.outline.map_or((None, 1.0), |(c, s)| (Some(c), s));
             if frame.outline_high_contrast {
                 stroke(0xff00_0000, 7.0 * scale, lines);
                 stroke(custom.unwrap_or(0xff57_ffe1), width * scale, lines);
@@ -15718,11 +15718,11 @@ mod shadow_caster_tests {
     #[test]
     fn the_shadow_pass_draws_terrain_outside_the_pack_s_planes() {
         let kept = |near: Option<f32>, far: Option<f32>, y: f64, min: [f32; 3], depth: bool| {
-            let shadow = horizon_render_pipeline::Shadow {
+            let shadow = horizon_shaders::Shadow {
                 distance: 128.0,
                 near,
                 far,
-                ..horizon_render_pipeline::Shadow::default()
+                ..horizon_shaders::Shadow::default()
             };
             let camera = DVec3::new(13.5, y + 1.62, -13.5);
             let view = pack_post::ShadowView {

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,
-            look: Default::default(),
+            pvp: Default::default(),
             debug_lines: &[],
             debug_lines_on_top: &[],
             debug_crosshair: &[],

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

@@ -1,12 +1,11 @@
-//! OptiFine custom sky layers on the GPU: one texture per layer, kept with the renderer (its pack),
+//! Custom sky layers (`crate::custom_sky`) on the GPU: one texture per layer, kept with the renderer (its pack),
 //! a static skybox mesh of the 3x2 grid's six faces, and one pipeline per blend mode. A frame
 //! uploads one small uniform per drawn layer ([`crate::custom_sky::Draw`]) and draws 36 vertices
 //! each, after the vanilla sky's disc and sunrise and before the sun, moon and stars.
 use glam::Mat4;
-use horizon_optifine::sky::{Blend, Face};
 use wgpu::util::DeviceExt;
 
-use crate::custom_sky::{CustomSky as Pack, Draw};
+use crate::custom_sky::{Blend, Draw, SkyLayers};
 
 /// The blend modes in the shader's `mode` order (custom_sky.wgsl).
 const MODES: [Blend; 9] = [
@@ -85,6 +84,76 @@ fn blend(mode: Blend) -> wgpu::BlendComponent {
     }
 }
 
+/// A face of the skybox, as the 3x2 grid of its texture holds them: `Bottom`, `Top`, `South` in
+/// the top row, `West`, `North`, `East` below.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum Face {
+    Bottom,
+    Top,
+    South,
+    West,
+    North,
+    East,
+}
+
+impl Face {
+    const ALL: [Self; 6] = [
+        Self::Bottom,
+        Self::Top,
+        Self::South,
+        Self::West,
+        Self::North,
+        Self::East,
+    ];
+
+    /// The face's cell of the texture, `[u0, v0, u1, v1]` in 0..1.
+    fn cell(self) -> [f32; 4] {
+        let (col, row) = match self {
+            Self::Bottom => (0, 0),
+            Self::Top => (1, 0),
+            Self::South => (2, 0),
+            Self::West => (0, 1),
+            Self::North => (1, 1),
+            Self::East => (2, 1),
+        };
+        let (u, v) = (col as f32 / 3.0, row as f32 / 2.0);
+        [u, v, u + 1.0 / 3.0, v + 0.5]
+    }
+
+    /// The face's corners (on the unit cube around the camera; x east, y up, z south) in the
+    /// order of its cell's `(u0, v0)`, `(u1, v0)`, `(u1, v1)`, `(u0, v1)`. The side faces are
+    /// seen from inside with up at the top of their cell; the top face has north at the bottom of
+    /// its cell, the bottom face north at the top (the template's `N` marks).
+    fn corners(self) -> [[f32; 3]; 4] {
+        match self {
+            // Seen looking north: west on the left.
+            Self::North => [
+                [-1., 1., -1.],
+                [1., 1., -1.],
+                [1., -1., -1.],
+                [-1., -1., -1.],
+            ],
+            Self::South => [[1., 1., 1.], [-1., 1., 1.], [-1., -1., 1.], [1., -1., 1.]],
+            Self::East => [[1., 1., -1.], [1., 1., 1.], [1., -1., 1.], [1., -1., -1.]],
+            Self::West => [
+                [-1., 1., 1.],
+                [-1., 1., -1.],
+                [-1., -1., -1.],
+                [-1., -1., 1.],
+            ],
+            // Looking up with north toward the cell's bottom edge: east on the right.
+            Self::Top => [[-1., 1., 1.], [1., 1., 1.], [1., 1., -1.], [-1., 1., -1.]],
+            // Looking down with north toward the cell's top edge: east on the right.
+            Self::Bottom => [
+                [-1., -1., -1.],
+                [1., -1., -1.],
+                [1., -1., 1.],
+                [-1., -1., 1.],
+            ],
+        }
+    }
+}
+
 /// The skybox's 36 vertices: two triangles per face, each corner with its cell's UV.
 fn mesh() -> Vec<Vertex> {
     let mut out = Vec::with_capacity(36);
@@ -256,10 +325,15 @@ impl CustomSky {
     }
 
     /// The pack's layer textures, replacing any before.
-    pub(super) fn set_pack(&mut self, device: &wgpu::Device, queue: &wgpu::Queue, pack: &Pack) {
+    pub(super) fn set_pack(
+        &mut self,
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        pack: &dyn SkyLayers,
+    ) {
         let limit = device.limits().max_texture_dimension_2d;
         self.groups = pack
-            .images
+            .images()
             .iter()
             .map(|image| {
                 // Too large for this GPU: a 1x1 transparent texel, so the layer draws nothing.
@@ -413,6 +487,38 @@ impl CustomSky {
 mod tests {
     use super::*;
 
+    #[test]
+    fn the_grid_holds_each_face_once_and_faces_point_out() {
+        let mut cells: Vec<_> = Face::ALL
+            .iter()
+            .map(|f| f.cell().map(|x| (x * 6.0) as i32))
+            .collect();
+        cells.dedup();
+        assert_eq!(cells.len(), 6);
+        assert_eq!(Face::East.cell(), [2.0 / 3.0, 0.5, 1.0, 1.0]);
+        for face in Face::ALL {
+            let c = face.corners();
+            let sub = |a: [f32; 3], b: [f32; 3]| [a[0] - b[0], a[1] - b[1], a[2] - b[2]];
+            let (a, b) = (sub(c[1], c[0]), sub(c[3], c[0]));
+            let n = [
+                a[1] * b[2] - a[2] * b[1],
+                a[2] * b[0] - a[0] * b[2],
+                a[0] * b[1] - a[1] * b[0],
+            ];
+            let centre: [f32; 3] =
+                std::array::from_fn(|i| c.iter().map(|p| p[i]).sum::<f32>() / 4.0);
+            // Seen from inside, u runs right and v down, so u x v points away from the camera.
+            let dot: f32 = (0..3).map(|i| n[i] * centre[i]).sum();
+            assert!(dot > 0.0, "{face:?} is mirrored");
+        }
+        // The top cell's bottom edge (v1) is north: its corners 2 and 3 have z = -1.
+        assert_eq!(Face::Top.corners()[2][2], -1.0);
+        assert_eq!(Face::Top.corners()[3][2], -1.0);
+        // The bottom cell's top edge (v0) is north.
+        assert_eq!(Face::Bottom.corners()[0][2], -1.0);
+        assert_eq!(Face::Bottom.corners()[1][2], -1.0);
+    }
+
     /// What a blend leaves a sky texel of `dst` with when the shader outputs `src`
     /// (custom_sky.wgsl) for a layer texel `t` at brightness `b`, per channel.
     fn mix(mode: Blend, dst: f32, t: f32, a: f32, b: f32) -> f32 {

crates/horizon-client-render/src/gfx/custom_sky.wgsl

@@ -6,7 +6,7 @@ struct Layer {
     // Projection * view (camera-relative) * the layer's rotation.
     clip_from_sky: mat4x4<f32>,
     brightness: f32,
-    // horizon_optifine::sky::Blend, in gfx/custom_sky.rs's MODES order.
+    // crate::custom_sky::Blend, in gfx/custom_sky.rs's MODES order.
     mode: u32,
     pad: vec2<u32>,
     hdr_settings: vec4<f32>,

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

@@ -338,7 +338,7 @@ pub struct NativeFrame {
     reflection_sampler: wgpu::Sampler,
     /// The shadow map the stages read, and the camera that draws it when the pack asks for one.
     pub shadow_map: super::native_shadow::ShadowMap,
-    shadow_camera: Option<horizon_render_pipeline::Shadow>,
+    shadow_camera: Option<horizon_shaders::Shadow>,
     /// Whether the pack's material reads `reflection` (`NativePack::new`): else no mirror
     /// is drawn and `has_reflection` stays 0.
     pub reflects: bool,
@@ -1497,7 +1497,7 @@ pub fn frame_inputs(
     size: [u32; 2],
     seconds: f32,
     index: u32,
-    shadow: Option<&horizon_render_pipeline::Shadow>,
+    shadow: Option<&horizon_shaders::Shadow>,
 ) -> FrameInputs {
     let aspect = size[0] as f32 / size[1].max(1) as f32;
     let view = crate::camera::view_matrix(frame.yaw, frame.pitch);

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

@@ -6,8 +6,8 @@
 //! draw lists (`ShadowView`) serve both; the map's texels are distorted toward the camera as the
 //! prelude's `shadow_position` undoes.
 
-use horizon_render_pipeline::Shadow;
 use horizon_shader_api::{Api, Frame as FrameInputs, manifest::Shadow as Settings, stages::GROUP};
+use horizon_shaders::Shadow;
 
 use super::native_material::TerrainShape;
 use super::wgsl_prefix::{TERRAIN, prefixed, section};

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

@@ -4,8 +4,7 @@
 
 use std::collections::BTreeMap;
 
-use horizon_render_pipeline::{Format, Kind};
-use horizon_shaders::{BufferObject, CustomImage};
+use horizon_shaders::{BufferObject, CustomImage, Format, Kind};
 
 pub(super) struct PackImage {
     pub(super) def: CustomImage,

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

@@ -18,8 +18,7 @@
 use std::collections::HashMap;
 
 use glam::{DMat4, DVec3};
-use horizon_render_pipeline::{BUFFERS, Format, Kind, SHADOW_COLORS};
-use horizon_shaders::{Group, Post};
+use horizon_shaders::{BUFFERS, Format, Group, Kind, Post, SHADOW_COLORS};
 use smallvec::SmallVec;
 
 use super::pack_draw::DrawUniforms;
@@ -893,7 +892,7 @@ fn depth_linear(interface: &horizon_shaders::Interface, linear: u8) -> [f32; 4]
 }
 
 fn source(name: &str, shadow_space: bool, shadow_pass: bool, watershadow: bool) -> Source {
-    let shadow_color = horizon_render_pipeline::shadow_color(name);
+    let shadow_color = horizon_shaders::shadow_color(name);
     let shadow_depth = match name {
         "shadowtex0" | "watershadow" | "shadowtex0HW" => Some(0),
         "shadowtex1" | "shadowtex1HW" => Some(1),
@@ -912,7 +911,7 @@ fn source(name: &str, shadow_space: bool, shadow_pass: bool, watershadow: bool)
             };
         }
     }
-    if shadow_space && horizon_render_pipeline::buffer_index(name).is_some() {
+    if shadow_space && horizon_shaders::buffer_index(name).is_some() {
         // colortex buffers are not this pass's.
         return Source::Dummy;
     }
@@ -926,7 +925,7 @@ fn source(name: &str, shadow_space: bool, shadow_pass: bool, watershadow: bool)
         "normals" => Source::Normals,
         "specular" => Source::Specular,
         horizon_shaders::WATER_MASK => Source::WaterMask,
-        n => horizon_render_pipeline::buffer_index(n).map_or(Source::Dummy, Source::Color),
+        n => horizon_shaders::buffer_index(n).map_or(Source::Dummy, Source::Color),
     }
 }
 
@@ -1583,7 +1582,7 @@ fn bindings(
             !unbound
                 && (t.stage != pack_textures::stage(group)
                     || released.0 != t.stage
-                    || horizon_render_pipeline::buffer_index(&t.name)
+                    || horizon_shaders::buffer_index(&t.name)
                         .is_none_or(|b| released.1 & 1 << b == 0))
         });
         let image = pack
@@ -2433,7 +2432,7 @@ impl PackPost {
         let shadow_config = post.config.shadow.clone();
         let noise_size = post.config.noise_resolution.unwrap_or(256);
         let half_lives = post.config.half_lives;
-        for (name, ticks) in horizon_render_pipeline::HALF_LIVES.iter().zip(half_lives) {
+        for (name, ticks) in horizon_shaders::HALF_LIVES.iter().zip(half_lives) {
             if let Some(t) = ticks {
                 notes.push(format!("`{name}` is {t} ticks"));
             }

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,
-        look: Default::default(),
+        pvp: 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,
-        look: Default::default(),
+        pvp: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

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

@@ -10,7 +10,7 @@
 //! a fit to one driver's values, not a rule Iris states. `RGBA4` and `RGBA2` read back the `RGBA8`
 //! bytes in the same probe, as Horizon's 8-bit buffers already do.
 
-use horizon_render_pipeline::{Format, Kind};
+use horizon_shaders::{Format, Kind};
 use naga::{BinaryOperator, Expression, Literal, MathFunction, Statement, VectorSize};
 
 /// The bits each channel keeps in a buffer of format `f`, for the formats that keep fewer than

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,
-        look: Default::default(),
+        pvp: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

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

@@ -3,7 +3,7 @@
 //! with two sides that `shadowcomp` programs flip as composite programs flip colortex (6.1.6).
 //! Square, `shadowMapResolution` pixels.
 
-use horizon_render_pipeline::SHADOW_COLORS;
+use horizon_shaders::SHADOW_COLORS;
 
 type Ops<T> = wgpu::Operations<T>;
 type Color = wgpu::Color;
@@ -97,11 +97,7 @@ pub(super) fn stand_in(device: &wgpu::Device) -> wgpu::TextureView {
 }
 
 impl ShadowTargets {
-    pub fn reset_history(
-        &mut self,
-        device: &wgpu::Device,
-        shadow: &horizon_render_pipeline::Shadow,
-    ) {
+    pub fn reset_history(&mut self, device: &wgpu::Device, shadow: &horizon_shaders::Shadow) {
         let mut colors = 0;
         let mut doubled = 0;
         let formats = std::array::from_fn(|n| match &self.color[n] {
@@ -129,7 +125,7 @@ impl ShadowTargets {
     /// resolution is kept within the device's limit.
     pub fn new(
         device: &wgpu::Device,
-        shadow: &horizon_render_pipeline::Shadow,
+        shadow: &horizon_shaders::Shadow,
         formats: [wgpu::TextureFormat; SHADOW_COLORS],
         colors: u16,
         doubled: u16,

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

@@ -1,8 +1,7 @@
 //! A shader pack's custom textures (`texture.<stage>.<name>`, `texture.noise`) on the GPU, and
 //! which of them a program's sampler reads.
 
-use horizon_render_pipeline::Kind;
-use horizon_shaders::{CustomTexture, Group, Texels, Texture, TextureDim, TextureSource};
+use horizon_shaders::{CustomTexture, Group, Kind, Texels, Texture, TextureDim, TextureSource};
 
 /// What a custom texture is once uploaded: an image of ours, or one the game already has.
 pub(super) enum Image {
@@ -119,12 +118,12 @@ pub(super) fn find(textures: &[PackTexture], group: Group, ty: &str, name: &str)
     } else {
         wgpu::TextureViewDimension::D2
     };
-    let buffer = horizon_render_pipeline::buffer_index(name);
+    let buffer = horizon_shaders::buffer_index(name);
     let staged = textures.iter().position(|t| {
         t.stage == stage(group)
             && t.dimension == dimension
             && (t.name == name
-                || buffer.is_some() && horizon_render_pipeline::buffer_index(&t.name) == buffer)
+                || buffer.is_some() && horizon_shaders::buffer_index(&t.name) == buffer)
     });
     staged.or_else(|| {
         textures.iter().position(|t| {

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

@@ -28,7 +28,7 @@
 //! [-w, w], and the depth buffers packs read hold GL window depth.
 
 use glam::{DMat4, DVec3, Mat4, Vec3, Vec4};
-use horizon_render_pipeline::Shadow;
+use horizon_shaders::Shadow;
 
 use super::Frame;
 
@@ -440,7 +440,7 @@ pub struct FrameUniforms {
     center_depth: Option<f32>,
     /// The pack's shadow settings (7.1).
     pub shadow: Shadow,
-    /// The pack's smoothing half-lives in ticks (`horizon_render_pipeline::HALF_LIVES`).
+    /// The pack's smoothing half-lives in ticks (`horizon_shaders::HALF_LIVES`).
     pub half_lives: [Option<f32>; 4],
 }
 
@@ -2664,7 +2664,7 @@ pub(super) mod initial_history_tests {
             outline: Vec::new(),
             outline_after_terrain: false,
             outline_high_contrast: false,
-            look: Default::default(),
+            pvp: Default::default(),
             debug_lines: &[],
             debug_lines_on_top: &[],
             debug_crosshair: &[],

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

@@ -89,6 +89,8 @@ pub mod options_fixes;
 pub mod options_ui;
 pub mod overlay;
 pub mod pack_browser;
+pub mod pack_formats;
+pub mod pack_hooks;
 pub mod pack_options_ui;
 pub mod pack_palette;
 pub mod pack_screen;

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

@@ -339,6 +339,7 @@ impl Opt {
             Opt::SharePresence => "options.sharePresence",
             Opt::DirectionalAudio => "options.directionalAudio",
             Opt::MusicToast => "options.musicToast",
+            Opt::Page(page, row) => pages::slider_caption(page, row),
         }
     }
     pub(crate) fn kind(self, s: &Settings) -> Kind {
@@ -402,6 +403,7 @@ impl Opt {
             Opt::PadLookDeadzone => unit(s.controller.look_deadzone, 0.0, 0.5),
             Opt::PadTriggerThreshold => unit(s.controller.trigger_threshold, 0.1, 0.9),
             Opt::SprintWindow => unit(s.sprint_window as f32, 0.0, 10.0),
+            Opt::Page(page, row) => pages::slider_kind(page, row),
             _ => Kind::Cycle,
         }
     }
@@ -878,6 +880,7 @@ impl Opt {
                 gamepad::TextKeyboard::Horizon => "horizon.options.keyboard.horizon",
                 gamepad::TextKeyboard::Steam => "horizon.options.keyboard.steam",
             }),
+            Opt::Page(page, row) => pages::slider_text(page, row),
             _ => Text::empty(),
         }
     }
@@ -952,6 +955,7 @@ impl Opt {
             Opt::PadLookDeadzone => s.controller.look_deadzone = step(0.0, 50.0) / 100.0,
             Opt::PadTriggerThreshold => s.controller.trigger_threshold = step(10.0, 90.0) / 100.0,
             Opt::SprintWindow => s.sprint_window = step(0.0, 10.0) as i32,
+            Opt::Page(page, row) => pages::slide(page, row, v),
             _ => {}
         }
         if self.affects_preset() {
@@ -1624,8 +1628,6 @@ pub struct OptionsUi {
     /// The native mod's key waiting: (mod, key) in `mods.installed`, or a registered page's
     /// (page, row) ([`pages::PAGE_KEY`]).
     selected_native_key: Option<(usize, usize)>,
-    /// The pages crates registered (`horizon_hooks::pages`).
-    pages: &'static [&'static dyn horizon_hooks::pages::Page],
     /// Bindings: the action waiting for a pad button.
     pub selected_pad_action: Option<&'static str>,
     /// The glyphs menus show (`Glyphs::of`: the setting, else the pad's family, and a Nintendo
@@ -1737,7 +1739,6 @@ impl Default for OptionsUi {
             scrollbar_drag_y: None,
             selected_key: None,
             selected_native_key: None,
-            pages: horizon_hooks::pages::engine::all(),
             selected_pad_action: None,
             pad_glyphs: crate::pad_glyph::Glyphs::default(),
             pad_driving: false,
@@ -1869,25 +1870,6 @@ fn wide_extras(s: &Settings, width: impl Fn(&str) -> f32) -> Vec<crate::extras::
         })
         .collect()
 }
-/// What a button opening one of Horizon's pages says on hover.
-fn horizon_page_tooltip(page: Page) -> Option<&'static str> {
-    Some(match page {
-        Page::Horizon => "horizon.pages.settings.tooltip",
-        Page::Studio => "horizon.pages.studio.tooltip",
-        Page::Graphics => "horizon.pages.graphics.tooltip",
-        Page::GraphicsAdvanced => "horizon.pages.graphics_advanced.tooltip",
-        Page::Controller => "horizon.pages.controller.tooltip",
-        Page::Extras => "horizon.pages.extras.tooltip",
-        Page::Pvp => "horizon.pages.pvp.tooltip",
-        Page::Agent => "horizon.pages.agent.tooltip",
-        Page::SplitProfiles => "horizon.pages.split_profiles.tooltip",
-        Page::ShaderPacks => "horizon.pages.shader_packs.tooltip",
-        Page::Mods => "horizon.pages.mods.tooltip",
-        Page::SplitSetup => "horizon.pages.split_setup.tooltip",
-        Page::Music => "horizon.pages.music.tooltip",
-        _ => return None,
-    })
-}
 /// Rows of an OptionsList: (big?, options) or a header.
 enum Row {
     Big(Opt),
@@ -1907,14 +1889,17 @@ fn tooltip_text(s: &Settings, wd: &Widget) -> Option<Text> {
             return None;
         };
         let key = opt.tooltip_key(s);
-        return lang::has(&key).then(|| tr(&key));
+        let Opt::Page(page, row) = opt else {
+            return lang::has(&key).then(|| tr(&key));
+        };
+        return pages::tooltip(*page, *row);
     };
     let mut tip = None;
     if let Act::Extra(item) = act {
         tip = Some(Text::literal(item.description_text()));
     }
     if let Act::Push(page) = act
-        && let Some(text) = horizon_page_tooltip(*page)
+        && let Some(text) = pages::horizon_page_tooltip(*page)
     {
         tip = Some(tr(text));
     }
@@ -1934,6 +1919,7 @@ fn tooltip_text(s: &Settings, wd: &Widget) -> Option<Text> {
     }
     match act {
         Act::Cycle(opt) if !opt.available() => Some(tr("horizon.options.unavailable")),
+        Act::PageRow(page, row) => pages::tooltip(*page, *row),
         Act::ToggleMod(i) => match s.mods.installed.get(*i) {
             Some(installed) => {
                 let description = installed

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

@@ -8,9 +8,88 @@ use horizon_hooks::pages as added;
 /// `selected_key` while a registered page's key waits (`selected_native_key`: page, row).
 pub(super) const PAGE_KEY: &str = "horizon.pageKey";
 
+#[cfg(test)]
+thread_local! {
+    /// A test's own pages, instead of the game's registered ones: each test runs on its thread.
+    static TEST_PAGES: std::cell::Cell<Option<&'static [&'static dyn added::Page]>> =
+        const { std::cell::Cell::new(None) };
+}
+
+/// The pages crates registered.
+fn registered() -> &'static [&'static dyn added::Page] {
+    #[cfg(test)]
+    if let Some(pages) = TEST_PAGES.get() {
+        return pages;
+    }
+    added::engine::all()
+}
+
 /// A registered page's title (a translation key).
 pub(super) fn title(page: usize) -> &'static str {
-    added::engine::all().get(page).map_or("", |p| p.title())
+    registered().get(page).map_or("", |p| p.title())
+}
+
+/// Row `r` of a registered page, as it is now.
+fn row(page: usize, r: usize) -> Option<added::Row> {
+    let mut rows = Vec::new();
+    registered().get(page)?.rows(&mut rows);
+    rows.into_iter().nth(r)
+}
+
+/// A registered page's slider ([`Opt::Page`]): its caption (a translation key).
+pub(super) fn slider_caption(page: usize, r: usize) -> &'static str {
+    match row(page, r) {
+        Some(added::Row::Slider { label, .. }) => label,
+        _ => "",
+    }
+}
+
+/// A registered page's slider: its position.
+pub(super) fn slider_kind(page: usize, r: usize) -> Kind {
+    match row(page, r) {
+        Some(added::Row::Slider { value, .. }) => Kind::Slider(value.clamp(0.0, 1.0)),
+        _ => Kind::Cycle,
+    }
+}
+
+/// A registered page's slider: the value its message shows after the caption.
+pub(super) fn slider_text(page: usize, r: usize) -> Text {
+    match row(page, r) {
+        Some(added::Row::Slider { text, .. }) => label_text(text),
+        _ => Text::empty(),
+    }
+}
+
+/// A registered page's slider moved.
+pub(super) fn slide(page: usize, r: usize, value: f32) {
+    if let Some(registered) = registered().get(page) {
+        registered.act(r, added::Act::Slide(value));
+    }
+}
+
+/// What a registered page's row says on hover.
+pub(super) fn tooltip(page: usize, r: usize) -> Option<Text> {
+    registered().get(page)?.tooltip(r).map(label_text)
+}
+
+/// What a button opening one of Horizon's pages says on hover.
+pub(super) fn horizon_page_tooltip(page: Page) -> Option<&'static str> {
+    Some(match page {
+        Page::Horizon => "horizon.pages.settings.tooltip",
+        Page::Studio => "horizon.pages.studio.tooltip",
+        Page::Graphics => "horizon.pages.graphics.tooltip",
+        Page::GraphicsAdvanced => "horizon.pages.graphics_advanced.tooltip",
+        Page::Controller => "horizon.pages.controller.tooltip",
+        Page::Extras => "horizon.pages.extras.tooltip",
+        Page::Pvp => "horizon.pages.pvp.tooltip",
+        Page::Agent => "horizon.pages.agent.tooltip",
+        Page::SplitProfiles => "horizon.pages.split_profiles.tooltip",
+        Page::ShaderPacks => "horizon.pages.shader_packs.tooltip",
+        Page::Mods => "horizon.pages.mods.tooltip",
+        Page::SplitSetup => "horizon.pages.split_setup.tooltip",
+        Page::Music => "horizon.pages.music.tooltip",
+        _ => return None,
+    })
 }
 
 fn label_text(label: added::Label) -> Text {
@@ -66,8 +145,7 @@ impl OptionsUi {
 
     /// The entries of the pages registered for Horizon Settings, two to a row like the engine's.
     fn added_entries(&self, rows: &mut Vec<Row>) {
-        let mut entries = self
-            .pages
+        let mut entries = registered()
             .iter()
             .enumerate()
             .filter(|(_, page)| page.place() == added::Place::HorizonSettings)
@@ -79,7 +157,7 @@ impl OptionsUi {
 
     /// A registered page's rows, asked of it each time the page is drawn.
     pub(super) fn added_rows(&self, page: usize) -> Vec<Row> {
-        let Some(registered) = self.pages.get(page) else {
+        let Some(registered) = registered().get(page) else {
             return Vec::new();
         };
         let mut rows = Vec::new();
@@ -98,6 +176,7 @@ impl OptionsUi {
             added::Row::Note(text) => Row::Note(text),
             added::Row::Toggle { label, on } => wide(generic(label, on_off(on))),
             added::Row::Cycle { label, value } => wide(generic(label, label_text(value))),
+            added::Row::Slider { .. } => Row::Big(Opt::Page(page, r)),
             added::Row::Button { label } => wide(tr(label)),
             added::Row::Key { label, key } => {
                 let mut message = keybinds::display_name(&key);
@@ -120,7 +199,7 @@ impl OptionsUi {
 
     /// A registered page's row was pressed: a key row waits for a key, any other row hears it.
     pub(super) fn page_act(&mut self, page: usize, r: usize, shift: bool) -> Vec<Event> {
-        let Some(registered) = self.pages.get(page) else {
+        let Some(registered) = registered().get(page) else {
             return Vec::new();
         };
         let mut rows = Vec::new();
@@ -199,7 +278,7 @@ impl OptionsUi {
     ) -> Vec<Event> {
         let (i, k) = self.selected_native_key.take().unwrap_or_default();
         if name == PAGE_KEY {
-            if let Some(page) = self.pages.get(i) {
+            if let Some(page) = registered().get(i) {
                 page.act(k, added::Act::Bind(value));
             }
             return vec![Event::Changed];
@@ -221,11 +300,12 @@ mod tests {
     use super::*;
     use std::sync::Mutex;
 
-    /// A page with a heading, a switch, a number that steps either way and a key.
+    /// A page with a heading, a switch, a number that steps either way, a key and a volume.
     struct Sample {
         on: Mutex<bool>,
         step: Mutex<i32>,
         key: Mutex<String>,
+        volume: Mutex<f32>,
     }
 
     impl added::Page for Sample {
@@ -252,6 +332,12 @@ mod tests {
                 label: "test.sample.key",
                 key: self.key.lock().unwrap().clone(),
             });
+            let volume = *self.volume.lock().unwrap();
+            rows.push(added::Row::Slider {
+                label: "test.sample.volume",
+                value: volume,
+                text: added::Label::Value(format!("{}%", (volume * 100.0).round())),
+            });
         }
         fn act(&self, row: usize, act: added::Act) {
             match (row, act) {
@@ -262,15 +348,20 @@ mod tests {
                 (2, added::Act::Press) => *self.step.lock().unwrap() += 1,
                 (2, added::Act::PressBack) => *self.step.lock().unwrap() -= 1,
                 (3, added::Act::Bind(key)) => *self.key.lock().unwrap() = key,
+                (4, added::Act::Slide(v)) => *self.volume.lock().unwrap() = v,
                 other => panic!("row and act the page doesn't expect: {other:?}"),
             }
         }
+        fn tooltip(&self, row: usize) -> Option<added::Label> {
+            (row == 1).then_some(added::Label::Key("test.sample.switch.tooltip"))
+        }
     }
 
     static SAMPLE: Sample = Sample {
         on: Mutex::new(false),
         step: Mutex::new(0),
         key: Mutex::new(String::new()),
+        volume: Mutex::new(0.0),
     };
     static PAGES: [&dyn added::Page; 1] = [&SAMPLE];
 
@@ -297,10 +388,8 @@ mod tests {
     #[test]
     fn a_registered_page_opens_from_horizon_settings_and_hears_its_rows() {
         let mut s = Settings::default();
-        let mut ui = OptionsUi {
-            pages: &PAGES,
-            ..OptionsUi::default()
-        };
+        TEST_PAGES.set(Some(&PAGES));
+        let mut ui = OptionsUi::default();
         ui.show(Page::Horizon);
         press(&mut ui, &mut s, Act::Push(Page::Added(0)), false);
         assert_eq!(ui.page(), Page::Added(0));
@@ -323,5 +412,53 @@ mod tests {
         assert_eq!(events, [Event::Changed]);
         assert_eq!(*SAMPLE.key.lock().unwrap(), "key.keyboard.z");
         assert_eq!(ui.selected_key, None);
+        // The volume is one of the screen's own sliders: dragged to its middle, then let go.
+        let size = (480.0, 240.0);
+        let (widgets, ..) = ui.layout(&s, size.0, size.1);
+        let slider = widgets
+            .iter()
+            .find(|w| {
+                matches!(
+                    w.kind,
+                    WKind::Slider {
+                        opt: Opt::Page(0, 4),
+                        ..
+                    }
+                )
+            })
+            .expect("the volume's slider");
+        let (x, y) = (slider.x + slider.w / 2.0, slider.y + 1.0);
+        ui.click(&mut s, &atlas, x, y, size, [480, 240], false, false);
+        let volume = *SAMPLE.volume.lock().unwrap();
+        assert!((0.45..0.55).contains(&volume), "{volume}");
+        assert!(ui.release().contains(&Event::Changed));
+        // The slider shows the page's value once let go.
+        let (widgets, ..) = ui.layout(&s, size.0, size.1);
+        let shown = widgets.iter().find_map(|w| match w.kind {
+            WKind::Slider {
+                opt: Opt::Page(0, 4),
+                value,
+                ..
+            } => Some(value),
+            _ => None,
+        });
+        assert_eq!(shown, Some(volume));
+        // The page's tooltip for its switch.
+        let switch = widgets
+            .iter()
+            .find(|w| {
+                matches!(
+                    &w.kind,
+                    WKind::Button {
+                        act: Act::PageRow(0, 1),
+                        ..
+                    }
+                )
+            })
+            .expect("the switch");
+        assert_eq!(
+            tooltip_text(&s, switch).map(|t| t.plain()),
+            Some(tr("test.sample.switch.tooltip").plain())
+        );
     }
 }

crates/horizon-client-render/src/pack_formats/custom_sky.rs

@@ -0,0 +1,252 @@
+//! OptiFine custom skies (`horizon_optifine::sky`) on the engine's sky layers
+//! ([`crate::custom_sky`]): a pack's layers with their decoded textures, read once with the pack,
+//! and each frame's choice of layers, their brightness and rotation. A pack without
+//! `optifine/sky` has none, and the sky stays vanilla.
+
+use std::path::Path;
+
+use glam::{Mat4, Vec3};
+use horizon_optifine::sky::{Blend, Conditions, Now, Skies, SkyLayer, Transition};
+
+use crate::custom_sky::{self as engine, Draw, Image, SkyLayers, State};
+
+/// The pack's layers, by world, with one texture per layer (`images[i]` for the `i`th layer
+/// over all worlds, in `worlds` order).
+#[derive(Default)]
+pub struct CustomSky {
+    worlds: Vec<(i32, Vec<SkyLayer>)>,
+    pub images: Vec<Image>,
+}
+
+/// Textures past this many texels in all are left out (a skybox is a few megapixels at most).
+const TEXEL_BUDGET: u64 = 64 << 20;
+
+impl CustomSky {
+    /// The custom skies of the overlay at `root`. A layer whose texture does not decode is
+    /// dropped with a warning.
+    pub fn load(root: &Path) -> Self {
+        let skies = Skies::scan(root);
+        let mut out = Self::default();
+        let mut texels = 0u64;
+        for (world, sky) in skies.worlds {
+            let mut layers = Vec::new();
+            for layer in sky.layers {
+                match crate::hud::decode(&root.join(&layer.source)) {
+                    Ok((width, height, rgba))
+                        if texels + u64::from(width) * u64::from(height) <= TEXEL_BUDGET =>
+                    {
+                        texels += u64::from(width) * u64::from(height);
+                        out.images.push(Image {
+                            width,
+                            height,
+                            rgba,
+                        });
+                        layers.push(layer);
+                    }
+                    Ok(_) => log::warn!("{}: past the custom sky's texture budget", layer.source),
+                    Err(e) => log::warn!("{}: {e:#}", layer.source),
+                }
+            }
+            if !layers.is_empty() {
+                out.worlds.push((world, layers));
+            }
+        }
+        out
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.worlds.is_empty()
+    }
+}
+
+/// The engine's sky blend for OptiFine's.
+fn blend(blend: Blend) -> engine::Blend {
+    match blend {
+        Blend::Add => engine::Blend::Add,
+        Blend::Subtract => engine::Blend::Subtract,
+        Blend::Multiply => engine::Blend::Multiply,
+        Blend::Dodge => engine::Blend::Dodge,
+        Blend::Burn => engine::Blend::Burn,
+        Blend::Screen => engine::Blend::Screen,
+        Blend::Replace => engine::Blend::Replace,
+        Blend::Overlay => engine::Blend::Overlay,
+        Blend::Alpha => engine::Blend::Alpha,
+    }
+}
+
+impl SkyLayers for CustomSky {
+    fn images(&self) -> &[Image] {
+        &self.images
+    }
+
+    /// Whether `world` has layers (`0` the Overworld, `1` the End).
+    fn has(&self, world: i32) -> bool {
+        self.worlds.iter().any(|(w, _)| *w == world)
+    }
+
+    /// The layers whose conditions hold, eased over their `transition`, at the brightness of
+    /// their fade times.
+    fn draws(
+        &self,
+        world: i32,
+        conditions: &engine::Conditions,
+        sun_turns: f32,
+        seconds: f32,
+        state: &mut State,
+        out: &mut Vec<Draw>,
+    ) {
+        let conditions = &Conditions {
+            day_time: conditions.day_time,
+            weather: match conditions.weather {
+                engine::Weather::Clear => Now::Clear,
+                engine::Weather::Rain => Now::Rain,
+                engine::Weather::Thunder => Now::Thunder,
+            },
+            biome: conditions.biome,
+            y: conditions.y,
+        };
+        out.clear();
+        let mut first = 0;
+        let mut found = None;
+        for (w, layers) in &self.worlds {
+            if *w == world {
+                found = Some(layers);
+                break;
+            }
+            first += layers.len();
+        }
+        let Some(layers) = found else {
+            state.world = None;
+            return;
+        };
+        // A new world (or pack) starts each layer where its conditions put it: no fade in.
+        let snap = state.world != Some(world) || state.eased.len() != layers.len();
+        if snap {
+            state.world = Some(world);
+            state.eased.clear();
+            state.eased.resize(layers.len(), 0.0);
+        }
+        for (i, (layer, eased)) in layers.iter().zip(&mut state.eased).enumerate() {
+            let target = if layer.shows(conditions) { 1.0 } else { 0.0 };
+            let shown = if snap {
+                *eased = target;
+                target
+            } else {
+                let mut t = Transition { value: *eased };
+                *eased = t.step(target, seconds, layer.transition);
+                *eased
+            };
+            let brightness = shown * layer.brightness(conditions.day_time);
+            if brightness <= 0.0 {
+                continue;
+            }
+            let turns = layer.turns(conditions.day_time, sun_turns);
+            let rotation = if turns == 0.0 {
+                Mat4::IDENTITY
+            } else {
+                Mat4::from_axis_angle(Vec3::from_array(layer.axis), turns * std::f32::consts::TAU)
+            };
+            out.push(Draw {
+                image: (first + i) as u16,
+                blend: blend(layer.blend),
+                brightness,
+                rotation,
+            });
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::custom_sky::{Conditions, Weather};
+
+    fn pack(files: &[(&str, &str)]) -> (std::path::PathBuf, CustomSky) {
+        let root = std::env::temp_dir().join(format!(
+            "horizon-custom-sky-{}-{}",
+            std::process::id(),
+            files.len()
+        ));
+        let _ = std::fs::remove_dir_all(&root);
+        let dir = root.join("assets/minecraft/optifine/sky/world0");
+        std::fs::create_dir_all(&dir).unwrap();
+        let png = {
+            let mut bytes = Vec::new();
+            let mut encoder = png::Encoder::new(&mut bytes, 6, 4);
+            encoder.set_color(png::ColorType::Rgba);
+            encoder.set_depth(png::BitDepth::Eight);
+            let mut writer = encoder.write_header().unwrap();
+            writer
+                .write_image_data(&[255, 0, 0, 255].repeat(24))
+                .unwrap();
+            writer.finish().unwrap();
+            bytes
+        };
+        for (name, text) in files {
+            std::fs::write(dir.join(format!("{name}.properties")), text).unwrap();
+            std::fs::write(dir.join(format!("{name}.png")), &png).unwrap();
+        }
+        let sky = CustomSky::load(&root);
+        (root, sky)
+    }
+
+    fn noon(biome: &str) -> Conditions<'_> {
+        Conditions {
+            day_time: 6000,
+            weather: Weather::Clear,
+            biome,
+            y: 64,
+        }
+    }
+
+    #[test]
+    fn layers_ease_in_at_a_biome_border_but_not_on_arrival() {
+        let (root, sky) = pack(&[
+            ("sky1", "biomes=desert\ntransition=2"),
+            ("sky2", "blend=alpha\nrotate=false"),
+        ]);
+        let _ = std::fs::remove_dir_all(root);
+        assert!(sky.has(0) && !sky.has(1));
+        assert_eq!(sky.images[0].width, 6);
+        let (mut state, mut out) = (State::default(), Vec::new());
+        sky.draws(
+            0,
+            &noon("minecraft:desert"),
+            0.0,
+            0.05,
+            &mut state,
+            &mut out,
+        );
+        assert_eq!(
+            out.iter().map(|d| d.brightness).collect::<Vec<_>>(),
+            [1.0, 1.0]
+        );
+        // Out of the desert: the first layer fades over its two seconds.
+        sky.draws(0, &noon("minecraft:plains"), 0.0, 0.5, &mut state, &mut out);
+        assert_eq!(out[0].brightness, 0.75);
+        assert_eq!(out[1].blend, engine::Blend::Alpha);
+        sky.draws(0, &noon("minecraft:plains"), 0.0, 2.0, &mut state, &mut out);
+        assert_eq!(out.len(), 1, "a dark layer is not drawn");
+        assert_eq!(out[0].image, 1);
+        // Into the End, which has no layers, and back: no fade.
+        sky.draws(1, &noon("minecraft:desert"), 0.0, 0.0, &mut state, &mut out);
+        assert!(out.is_empty());
+        sky.draws(0, &noon("minecraft:desert"), 0.0, 0.0, &mut state, &mut out);
+        assert_eq!(out.len(), 2);
+    }
+
+    #[test]
+    fn a_layer_turns_west_like_the_sun() {
+        let (root, sky) = pack(&[("sky1", "")]);
+        let _ = std::fs::remove_dir_all(root);
+        let (mut state, mut out) = (State::default(), Vec::new());
+        // A quarter turn after noon (sunset): the skybox's zenith has gone down to the west.
+        let c = Conditions {
+            day_time: 12000,
+            ..noon("minecraft:plains")
+        };
+        sky.draws(0, &c, 0.25, 0.0, &mut state, &mut out);
+        let up = out[0].rotation.transform_vector3(Vec3::Y);
+        assert!((up - Vec3::NEG_X).length() < 1e-5, "{up}");
+    }
+}

crates/horizon-client-render/src/pack_formats/mod.rs

@@ -0,0 +1,26 @@
+//! The resource pack formats vanilla doesn't read (OptiFine's, Polytone's) on the engine's
+//! extension points ([`crate::pack_hooks`]). This is platform code (docs/layers.md) kept in this
+//! crate until the platform's executable installs it: it uses only the crate's public API, so it
+//! moves to a platform crate unchanged, and nothing else in the crate names it.
+
+mod custom_sky;
+
+use std::path::Path;
+use std::sync::Arc;
+
+use crate::pack_hooks::PackFormats;
+
+/// OptiFine's and Polytone's formats.
+pub struct Formats;
+
+impl PackFormats for Formats {
+    fn custom_sky(&self, root: &Path) -> Option<Arc<dyn crate::custom_sky::SkyLayers>> {
+        let sky = custom_sky::CustomSky::load(root);
+        (!sky.is_empty()).then(|| Arc::new(sky) as _)
+    }
+}
+
+/// Installs these formats ([`crate::pack_hooks::install`]); the game does at startup.
+pub fn install() {
+    crate::pack_hooks::install(&Formats);
+}

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

@@ -0,0 +1,35 @@
+//! The engine's extension points for resource pack formats vanilla doesn't read (OptiFine's,
+//! Polytone's: platform code, docs/layers.md). The engine asks [`formats`] once per pack load and
+//! gets engine types back (tables, or an object it calls at most once a frame), never a format's
+//! own types. The platform installs its formats at startup ([`install`]); with none installed,
+//! packs load as vanilla reads them.
+
+use std::path::Path;
+use std::sync::{Arc, OnceLock};
+
+/// What the pack formats beyond vanilla's add to a pack. Each method reads one overlay of a pack
+/// (its folder at `root`); the default is "nothing in this format".
+pub trait PackFormats: Send + Sync {
+    /// The sky layers the overlay draws over the vanilla sky, if it has any.
+    fn custom_sky(&self, _root: &Path) -> Option<Arc<dyn crate::custom_sky::SkyLayers>> {
+        None
+    }
+}
+
+/// No format beyond vanilla's.
+struct Vanilla;
+
+impl PackFormats for Vanilla {}
+
+static FORMATS: OnceLock<&'static dyn PackFormats> = OnceLock::new();
+
+/// Installs the pack formats, before the first pack loads. The first call wins: later ones are
+/// ignored, so each test or probe that needs the formats may install them.
+pub fn install(formats: &'static dyn PackFormats) {
+    let _ = FORMATS.set(formats);
+}
+
+/// The installed pack formats, or vanilla's alone.
+pub fn formats() -> &'static dyn PackFormats {
+    FORMATS.get().copied().unwrap_or(&Vanilla)
+}

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

@@ -31,6 +31,7 @@ mod native;
 pub mod polytone;
 mod polytone_gpu;
 mod polytone_model;
+mod spawn;
 pub use native::{ParticleController, ParticleUpdate};
 
 /// `ParticleOptions` with the parameters of the option classes used here.
@@ -1222,8 +1223,9 @@ pub struct ParticleLevel<'a> {
     pub collision: &'a BlockCollisionRegistry<'a>,
     /// Local player feet position and vertical velocity (`PlayerCloudParticle`).
     pub player: Option<([f64; 3], f64)>,
+    pub cached_chunk: std::cell::Cell<Option<((i32, i32), Option<&'a crate::chunk::Chunk>)>>,
 }
-impl ParticleLevel<'_> {
+impl<'a> ParticleLevel<'a> {
     fn collide(&self, bb: Aabb, d: [f64; 3]) -> [f64; 3] {
         let mut scene = SceneCollisions {
             world: self.world,
@@ -1231,9 +1233,6 @@ impl ParticleLevel<'_> {
             subject: None,
         };
         let movement = Vec3::new(d[0], d[1], d[2]);
-        // `Entity.collideBoundingBox(null, ...)`: no entity shapes, no border. Where no
-        // block of the swept box's cells can collide, it finds no shape and the
-        // movement stands, as the resolution below would return it.
         if scene.cells_without_collision(bb.expand_towards(movement)) {
             return d;
         }
@@ -1249,38 +1248,46 @@ impl ParticleLevel<'_> {
             p[2].floor() as i32,
         ]
     }
+    #[inline]
+    pub fn block(&self, x: i32, y: i32, z: i32) -> horizon_world::registry::BlockStateId {
+        let (cx, cz) = (x >> 4, z >> 4);
+        let chunk = match self.cached_chunk.get() {
+            Some(((ccx, ccz), c)) if ccx == cx && ccz == cz => c,
+            _ => {
+                let c = self.world.chunks.get(&(cx, cz)).map(|c| c.as_ref());
+                self.cached_chunk.set(Some(((cx, cz), c)));
+                c
+            }
+        };
+        chunk.map_or(self.world.air, |c| c.block(x & 15, y, z & 15))
+    }
     /// The fluid at a block and `FluidState.getHeight`.
     fn fluid(&self, b: [i32; 3]) -> (Fluid, f64) {
-        let s = self.facts.get(self.world.block(b[0], b[1], b[2]));
+        let s = self.facts.get(self.block(b[0], b[1], b[2]));
         if s.fluid == Fluid::None {
             return (Fluid::None, 0.0);
         }
-        let above = self.facts.get(self.world.block(b[0], b[1] + 1, b[2]));
-        let height = if above.fluid == s.fluid {
+        let above = self.facts.get(self.block(b[0], b[1] + 1, b[2]));
+        let h = if above.fluid == s.fluid {
             1.0
         } else {
             f64::from(s.fluid_level) / 9.0
         };
-        (s.fluid, height)
+        (s.fluid, h)
     }
     /// The fluid at a block and whether it is a source (`FluidState.isSource`).
     pub(crate) fn fluid_source(&self, b: [i32; 3]) -> (Fluid, bool) {
-        let s = self.facts.get(self.world.block(b[0], b[1], b[2]));
+        let s = self.facts.get(self.block(b[0], b[1], b[2]));
         (s.fluid, s.fluid_level == 8 && !s.fluid_falling)
     }
     /// `getCollisionShape(...).max(Y, x, z)` for cached shapes.
     fn collision_top(&self, b: [i32; 3], fx: f64, fz: f64) -> f64 {
-        let state = self.world.block(b[0], b[1], b[2]);
+        let state = self.block(b[0], b[1], b[2]);
         match self.collision.cached_shapes().cached_shape(state) {
             Ok(Some(shape)) if !shape.is_empty() => shape.max_at(Axis::Y, fx, fz),
             Ok(Some(_)) => 0.0,
-            _ => {
-                if self.facts.get(state).full_collision {
-                    1.0
-                } else {
-                    0.0
-                }
-            }
+            _ if self.facts.get(state).full_collision => 1.0,
+            _ => 0.0,
         }
     }
 }
@@ -2020,73 +2027,6 @@ impl ParticleEngine {
             (eye[0] - pos[0]).powi(2) + (eye[1] - pos[1]).powi(2) + (eye[2] - pos[2]).powi(2) <= 9.0
         })
     }
-    /// `ClientPacketListener.handleParticleEvent` for `ServerLevel.sendParticles`.
-    pub fn send_particles(
-        &mut self,
-        options: &ParticleOptions,
-        at: [f64; 3],
-        spread: [f64; 3],
-        speed: f64,
-        count: u32,
-    ) {
-        if count == 0 {
-            let v = [speed * spread[0], speed * spread[1], speed * spread[2]];
-            self.add(options, at, v);
-            return;
-        }
-        for _ in 0..count {
-            let r = &mut self.random;
-            let p = [
-                at[0] + r.next_gaussian() * spread[0],
-                at[1] + r.next_gaussian() * spread[1],
-                at[2] + r.next_gaussian() * spread[2],
-            ];
-            let v = [
-                r.next_gaussian() * speed,
-                r.next_gaussian() * speed,
-                r.next_gaussian() * speed,
-            ];
-            self.add(options, p, v);
-        }
-    }
-    /// `ParticleEngine.createParticle`: always spawned, but `ParticleEngine.add`
-    /// drops a spore blossom air particle once `ParticleLimit.SPORE_BLOSSOM` is full.
-    pub fn create(&mut self, options: &ParticleOptions, p: [f64; 3], v: [f64; 3]) {
-        if let Some(requests) = &mut self.created_requests {
-            requests.push((options.clone(), p, v));
-            return;
-        }
-        let seed = self.seeds.next_long();
-        if let Some(mut particle) = self.make(options, p, v, seed) {
-            *self.made.entry(options.ty.name()).or_default() += 1;
-            // Resource packs' Polytone particle modifiers (#11486), once as it spawns.
-            if let Some(registry) = &self.polytone
-                && registry.modifies_particles()
-            {
-                let id = match &options.mod_particle {
-                    Some(name) => name.clone(),
-                    None => format!("minecraft:{}", options.ty.name()),
-                };
-                polytone::modify(registry, &id, options.source.as_deref(), &mut particle);
-            }
-            // The provider has drawn, so rejecting here keeps vanilla's RNG order.
-            // shortcut: counts live plus queued particles by scanning instead of
-            // vanilla's counted map; use a counter if spore spawning shows in profiles.
-            if particle.ty == ParticleType::SporeBlossomAir
-                && self.particles.len() + self.pending.len() >= SPORE_BLOSSOM_LIMIT
-                && self
-                    .particles
-                    .iter()
-                    .chain(self.pending.iter())
-                    .filter(|q| q.ty == ParticleType::SporeBlossomAir)
-                    .count()
-                    >= SPORE_BLOSSOM_LIMIT
-            {
-                return;
-            }
-            self.pending.push(particle);
-        }
-    }
     /// How many particles of each type were made so far.
     pub fn made(&self) -> &std::collections::BTreeMap<&'static str, u64> {
         &self.made
@@ -4052,15 +3992,12 @@ impl ParticleEngine {
             }
             Behaviour::Lava => {
                 p.base_tick(level);
-                if !p.removed {
-                    let odds = p.age as f32 / p.lifetime as f32;
-                    if p.random.next_float() > odds {
-                        self.add(
-                            &ParticleOptions::simple(ParticleType::Smoke),
-                            p.position,
-                            p.velocity,
-                        );
-                    }
+                if !p.removed && p.random.next_float() > p.age as f32 / p.lifetime as f32 {
+                    self.add(
+                        &ParticleOptions::simple(ParticleType::Smoke),
+                        p.position,
+                        p.velocity,
+                    );
                 }
             }
             Behaviour::Crit => {
@@ -4144,9 +4081,7 @@ impl ParticleEngine {
                     *c *= f64::from(0.98f32);
                 }
                 if p.on_ground {
-                    if p.random.next_float() < 0.5 {
-                        p.removed = true;
-                    }
+                    p.removed |= p.random.next_float() < 0.5;
                     p.velocity[0] *= f64::from(0.7f32);
                     p.velocity[2] *= f64::from(0.7f32);
                 }
@@ -4186,13 +4121,10 @@ impl ParticleEngine {
             } => {
                 p.base_tick(level);
                 let (fluid, source) = level.fluid_source(ParticleLevel::block_at(p.position));
-                if !(p.removed || (fluid == Fluid::Water && source)) {
-                    p.removed = true;
-                }
-                if !p.removed && p.position[1] >= y_end {
-                    p.removed = true;
-                }
-                if !p.removed && p.position[1] <= y_prev {
+                if !(fluid == Fluid::Water && source)
+                    || p.position[1] >= y_end
+                    || p.position[1] <= y_prev
+                {
                     p.removed = true;
                 }
                 // randomHorizontalWiggling, then a second, horizontal move.
@@ -4216,9 +4148,8 @@ impl ParticleEngine {
                 p.base_tick(level);
                 self.sprite_from_age(p);
                 if p.age as f32 > fade_start {
-                    let frames_since_fade_out_start = p.age as f32 - fade_start;
                     p.rgba[3] =
-                        (p.lifetime as f32 - frames_since_fade_out_start) / p.lifetime as f32;
+                        (p.lifetime as f32 - (p.age as f32 - fade_start)) / p.lifetime as f32;
                 }
             }
             Behaviour::NoxiousGasCloud => {
@@ -4682,7 +4613,7 @@ impl ParticleEngine {
                     self.sprite_from_age(p);
                     half(p);
                     let b = ParticleLevel::block_at(p.position);
-                    if level.facts.is_air(level.world.block(b[0], b[1], b[2])) {
+                    if level.facts.is_air(level.block(b[0], b[1], b[2])) {
                         p.velocity[1] -= f64::from(0.0074f32);
                     }
                 }
@@ -4690,7 +4621,7 @@ impl ParticleEngine {
             Behaviour::Firefly => {
                 p.base_tick(level);
                 let b = ParticleLevel::block_at(p.position);
-                if !level.facts.is_air(level.world.block(b[0], b[1], b[2])) {
+                if !level.facts.is_air(level.block(b[0], b[1], b[2])) {
                     p.removed = true;
                 } else {
                     p.rgba[3] = fade_amount(p.lifetime_progress(p.age as f32), 0.3, 0.5);
@@ -5154,11 +5085,12 @@ fn hdr_tier(ty: ParticleType) -> u8 {
 }
 /// `Particle.LifetimeAlpha.currentAlphaForAge`.
 fn lifetime_alpha(a: [f32; 4], age: i32, lifetime: i32, partial: f32) -> f32 {
-    if (a[0] - a[1]).abs() < 1.0e-5 {
-        return a[0];
-    }
     let t = ((age as f32 + partial) / lifetime as f32 - a[2]) / (a[3] - a[2]);
-    a[0] + (a[1] - a[0]) * t.clamp(0.0, 1.0)
+    if (a[0] - a[1]).abs() < 1.0e-5 {
+        a[0]
+    } else {
+        a[0] + (a[1] - a[0]) * t.clamp(0.0, 1.0)
+    }
 }
 
 struct Starter {
@@ -5589,6 +5521,7 @@ mod tests {
             facts: &facts,
             collision: &collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = ParticleEngine::new(Path::new(""), &HashMap::new(), &HashSet::new());
         engine.set_sprites.push(vec![10, 11, 12]);
@@ -5680,6 +5613,7 @@ mod tests {
             facts: &facts,
             collision: &collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = ParticleEngine::new(Path::new(""), &HashMap::new(), &HashSet::new());
         let mut particle = Particle::blank(ParticleType::Smoke, [0.0; 3]);

crates/horizon-client-render/src/particles/native.rs

@@ -124,6 +124,7 @@ mod tests {
             facts: &facts,
             collision: &collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut e = engine();
         let mut p = e

crates/horizon-client-render/src/particles/polytone.rs

@@ -490,14 +490,14 @@ enum Subject<'a> {
 }
 
 /// What one expression runs against: its subject, the frame and the level.
-struct Ctx<'a> {
+struct Ctx<'a, 'l> {
     subject: Subject<'a>,
     random: &'a mut LegacyRandom,
     custom: &'a mut f64,
     customs: &'a mut BTreeMap<String, f64>,
     frame: &'a Frame,
     registry: &'a Registry,
-    level: Option<&'a ParticleLevel<'a>>,
+    level: Option<&'a ParticleLevel<'l>>,
     blocks: Vec<[i32; 3]>,
 }
 
@@ -515,7 +515,7 @@ fn axis(name: &str) -> usize {
     usize::from(name.as_bytes()[0] - b'x')
 }
 
-impl Ctx<'_> {
+impl Ctx<'_, '_> {
     fn position(&self) -> [f64; 3] {
         match &self.subject {
             Subject::Particle(p) => p.position,
@@ -683,7 +683,7 @@ impl Ctx<'_> {
     }
 }
 
-impl Host for Ctx<'_> {
+impl Host for Ctx<'_, '_> {
     fn root(&mut self, root: Root) -> V {
         match root {
             Root::Object => V::Object(SELF),
@@ -1662,6 +1662,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         // Air has no emitters; the torch fires its first emitter only.
@@ -1701,6 +1702,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         engine.polytone_animate(&level, [1, 64, 1]);
@@ -1722,6 +1724,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         engine.polytone_animate(&level, [1, 64, 1]);
@@ -1767,6 +1770,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let registry = Registry::read(&root, Default::default(), blocks);
         let frame = registry.frame.clone();
@@ -1820,6 +1824,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let registry = Registry::read(&root, Default::default(), blocks);
         let mut engine = engine(registry);
@@ -1853,6 +1858,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         let rect = crate::hud::Rect {
@@ -1905,6 +1911,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         let rect = crate::hud::Rect {
@@ -1966,6 +1973,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         engine.polytone_entity(&level, "minecraft:player", [1.0, 70.0, 1.0]);
@@ -2014,6 +2022,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         let rect = crate::hud::Rect {
@@ -2080,6 +2089,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let registry = Arc::new(Registry::read(&root, Default::default(), blocks));
         // The chunk's biome is id 0: plains, whose foliage is #336699.
@@ -2198,6 +2208,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         engine.polytone_entity(&level, "minecraft:player", [1.5, 70.0, 1.5]);
@@ -2276,6 +2287,7 @@ mod tests {
             facts: &scene.facts,
             collision: &scene.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let mut engine = engine(Registry::read(&root, Default::default(), blocks));
         // The test chunk's biome is the table's first: a cold one first, then a warm one.

crates/horizon-client-render/src/particles/spawn.rs

@@ -0,0 +1,73 @@
+//! Where particles come into the engine: a server's particle packet and a single particle made
+//! where the game asks for one.
+use super::*;
+
+impl ParticleEngine {
+    /// `ClientPacketListener.handleParticleEvent` for `ServerLevel.sendParticles`.
+    pub fn send_particles(
+        &mut self,
+        options: &ParticleOptions,
+        at: [f64; 3],
+        spread: [f64; 3],
+        speed: f64,
+        count: u32,
+    ) {
+        if count == 0 {
+            let v = [speed * spread[0], speed * spread[1], speed * spread[2]];
+            self.add(options, at, v);
+            return;
+        }
+        for _ in 0..count {
+            let r = &mut self.random;
+            let p = [
+                at[0] + r.next_gaussian() * spread[0],
+                at[1] + r.next_gaussian() * spread[1],
+                at[2] + r.next_gaussian() * spread[2],
+            ];
+            let v = [
+                r.next_gaussian() * speed,
+                r.next_gaussian() * speed,
+                r.next_gaussian() * speed,
+            ];
+            self.add(options, p, v);
+        }
+    }
+    /// `ParticleEngine.createParticle`: always spawned, but `ParticleEngine.add`
+    /// drops a spore blossom air particle once `ParticleLimit.SPORE_BLOSSOM` is full.
+    pub fn create(&mut self, options: &ParticleOptions, p: [f64; 3], v: [f64; 3]) {
+        if let Some(requests) = &mut self.created_requests {
+            requests.push((options.clone(), p, v));
+            return;
+        }
+        let seed = self.seeds.next_long();
+        if let Some(mut particle) = self.make(options, p, v, seed) {
+            *self.made.entry(options.ty.name()).or_default() += 1;
+            // Resource packs' Polytone particle modifiers (#11486), once as it spawns.
+            if let Some(registry) = &self.polytone
+                && registry.modifies_particles()
+            {
+                let id = match &options.mod_particle {
+                    Some(name) => name.clone(),
+                    None => format!("minecraft:{}", options.ty.name()),
+                };
+                polytone::modify(registry, &id, options.source.as_deref(), &mut particle);
+            }
+            // The provider has drawn, so rejecting here keeps vanilla's RNG order.
+            // shortcut: counts live plus queued particles by scanning instead of
+            // vanilla's counted map; use a counter if spore spawning shows in profiles.
+            if particle.ty == ParticleType::SporeBlossomAir
+                && self.particles.len() + self.pending.len() >= SPORE_BLOSSOM_LIMIT
+                && self
+                    .particles
+                    .iter()
+                    .chain(self.pending.iter())
+                    .filter(|q| q.ty == ParticleType::SporeBlossomAir)
+                    .count()
+                    >= SPORE_BLOSSOM_LIMIT
+            {
+                return;
+            }
+            self.pending.push(particle);
+        }
+    }
+}

crates/horizon-client-render/src/particles/tick_bench.rs

@@ -93,6 +93,7 @@ fn particle_tick_cost() {
         facts: &facts,
         collision: &collision,
         player: None,
+        cached_chunk: std::cell::Cell::new(None),
     };
     let ty = |name: &str| ParticleType::from_name(name).unwrap();
     let (fx, fy, fz) = (0.5, f64::from(FLOOR_Y + 5), 20.5);

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

@@ -4,7 +4,6 @@
 //! 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.
@@ -264,6 +263,15 @@ 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)]
@@ -520,36 +528,24 @@ 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 {
-    /// 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
+    pub fn frame(&self) -> Frame {
+        Frame {
+            outline: self.outline.stroke(),
+            hurt_texel: self.hit.texel(),
+            glint: self.tweaks.glint_texel(),
+        }
     }
 }
 
@@ -745,6 +741,15 @@ 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.
@@ -761,6 +766,21 @@ 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 {
@@ -1687,6 +1707,18 @@ 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();
@@ -1773,33 +1805,31 @@ 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 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));
+    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));
     }
 }

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

@@ -337,13 +337,6 @@ 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()
@@ -871,6 +864,8 @@ pub enum Opt {
     PadGameplayGuide,
     /// `options.modelPart.*`: one skin layer (index into `options_file::MODEL_PARTS`).
     ModelPart(usize),
+    /// A slider of a page a crate registered (`horizon_hooks::pages`): (page, row).
+    Page(usize, usize),
     /// 3D skin layers: the player's outer layer as extruded slabs.
     SkinLayers3d,
     MainHand,

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

@@ -192,7 +192,12 @@ impl SignData {
         let side = |t: Option<&Tag>| -> SignText {
             let mut out = SignText::default();
             let Some(t) = t else { return out };
-            if let Some(Tag::List(messages)) = t.get("messages") {
+            if let Some(messages) = t.get("messages") {
+                // `SignText.CODEC` reads a side all or nothing: a messages
+                // field that is not a list leaves the side empty.
+                let Tag::List(messages) = messages else {
+                    return SignText::default();
+                };
                 for (i, m) in messages.iter().take(4).enumerate() {
                     out.lines[i] = component_text(m);
                     out.click[i] = click_event(m);
@@ -307,6 +312,27 @@ pub fn editor_sprite(folder: &str, wood: &str) -> String {
 #[cfg(test)]
 mod tests {
     use super::*;
+    /// `SignText.CODEC` reads messages as a list: a string field fails the
+    /// whole side, taking its colour and glow with it.
+    #[test]
+    fn messages_that_are_not_a_list_load_an_empty_side() {
+        let tag = Tag::compound([(
+            "front_text",
+            Tag::compound([
+                ("messages", Tag::String("not a list".into())),
+                ("color", Tag::String("red".into())),
+                ("has_glowing_text", Tag::Byte(1)),
+            ]),
+        )]);
+        let mut decoded = SignData::default();
+        decoded.decode(&tag);
+        assert_eq!(
+            decoded.front,
+            SignText::default(),
+            "a failed message list takes the side's colour and glow with it"
+        );
+    }
+
     #[test]
     fn waxed_and_glowing_text_take_any_number() {
         let tag = Tag::compound([

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

@@ -1238,6 +1238,9 @@ pub struct EditBox {
     /// Grey completion shown after the text (EditBox.setSuggestion).
     pub suggestion: Option<String>,
     pub text_color: u32,
+    /// `EditBox.setCentered`: the text starts in the middle of the box's
+    /// width, not at its left edge (`BookSignScreen`'s title).
+    pub centered: bool,
     /// `EditBox.textColorUneditable`: the colour of a box `setEditable(false)`
     /// made read-only, which still shows its value and caret.
     pub text_color_uneditable: u32,
@@ -1536,6 +1539,7 @@ impl EditBox {
             focused_at: Instant::now(),
             suggestion: None,
             text_color: rgba(224, 224, 224, 255),
+            centered: false,
             text_color_uneditable: rgba(112, 112, 112, 255),
             editable: true,
             message: String::new(),
@@ -1559,6 +1563,16 @@ impl EditBox {
             self.y
         }
     }
+    /// `EditBox.updateTextPosition`: where the text starts, `(width - text
+    /// width) / 2` in for a centred box (vanilla's `textX`), else at
+    /// `text_x` (4 in from a border).
+    pub fn text_start_x(&self, text_width: f32) -> f32 {
+        if self.centered {
+            self.x + ((self.width - text_width) / 2.0).floor()
+        } else {
+            self.text_x()
+        }
+    }
     pub fn reset_blink(&mut self) {
         self.focused_at = Instant::now();
     }
@@ -1641,8 +1655,13 @@ impl EditBox {
     /// EditBox.findClickedPositionInText: the character boundary under GUI `x`.
     pub fn position_at(&mut self, atlas: &HudAtlas, x: f32) -> usize {
         self.layout(atlas);
-        let room = (x.floor() - self.text_x()).min(self.inner_width());
         let rest: String = self.value.chars().skip(self.display).collect();
+        let shown: String = rest
+            .chars()
+            .take(atlas.font.fit(&rest, self.inner_width()))
+            .collect();
+        let start = self.text_start_x(atlas.font.width_text(&Text::literal(shown.as_str())));
+        let room = (x.floor() - start).min(self.inner_width());
         self.display + atlas.font.fit(&rest, room)
     }
     /// EditBox.onClick: the cursor to the pointer, extending the selection
@@ -1849,7 +1868,12 @@ impl EditBox {
                 ),
             }
         };
-        let (tx, ty) = (self.text_x(), self.text_y());
+        let start = if self.centered {
+            self.text_start_x(atlas.font.width_text(&Text::literal(displayed.as_str())))
+        } else {
+            self.text_x()
+        };
+        let (tx, ty) = (start, self.text_y());
         let mut draw_x = tx;
         if !displayed.is_empty() {
             let half = if on_screen {
@@ -2650,4 +2674,19 @@ mod tests {
         assert!(edit.key(winit::keyboard::KeyCode::Backspace, false, false));
         assert_eq!(edit.value, "name");
     }
+
+    /// `EditBox.setCentered` (`BookSignScreen`'s title box): with the flag the
+    /// text starts `(width - text width) / 2` in, which is also where a click
+    /// maps; without it the text starts at the box's left edge.
+    #[test]
+    fn a_centred_box_starts_its_text_in_the_middle() {
+        let mut edit = EditBox::new(10.0, 0.0, 114.0, 9.0);
+        edit.bordered = false;
+        assert_eq!(edit.text_start_x(0.0), 10.0);
+        edit.centered = true;
+        assert_eq!(edit.text_start_x(0.0), 67.0);
+        assert_eq!(edit.text_start_x(18.0), 58.0);
+        // (114 - 5) / 2 = 54.5, rounded down.
+        assert_eq!(edit.text_start_x(5.0), 64.0);
+    }
 }

crates/horizon-client/Cargo.toml

@@ -122,12 +122,13 @@ controllers = ["horizon-client-lib/controllers", "dep:gilrs", "dep:horizon-duals
 # the server list, the Horizon Settings and Mods pages, Discord and Play with Friends. Players always get them; there is no switch. `grep -rn horizon-extras crates/` lists
 # every place it gates. Without it (`--no-default-features --features audio,controllers`) the
 # client is best effort: CI builds only the default.
-horizon-extras = ["discord", "friends"]
+horizon-extras = ["horizon-client-lib/horizon-extras", "discord", "friends"]
 # Online extras a server or a port can leave out; the server build has none of them. "Playing Horizon"
 # on Discord (game/discord.rs).
 discord = ["horizon-client-lib/discord"]
-# Play with Friends: sharing a world behind an invite code (game/friends.rs) and joining one.
-friends = ["horizon-client-lib/friends", "dep:horizon-friends"]
+# Play with Friends: sharing a world behind an invite code (game/friends.rs). Joining one is
+# horizon-friends' `game` side, which horizon-official registers (`horizon_hooks::tunnel`).
+friends = ["dep:horizon-friends"]
 # Records the call sites of mob random draws (`mob_ai_probe` traces).
 rng-trace = ["horizon-core/rng-trace", "horizon-client-lib/rng-trace"]
 # Rust's allocations go to the system heap instead of mimalloc, where heap profilers that replace

crates/horizon-client/examples/probe/emitter_particles_probe.rs

@@ -97,6 +97,7 @@ pub fn main() -> Result<()> {
         facts: &facts,
         collision: &collision,
         player: None,
+        cached_chunk: std::cell::Cell::new(None),
     };
     let mut engine = ParticleEngine::new(&root, &Default::default(), &Default::default());
     let mut out = BufWriter::new(File::create(&args[2])?);

crates/horizon-client/examples/probe/particle_providers_probe.rs

@@ -194,6 +194,7 @@ pub fn main() -> Result<()> {
             facts: &facts,
             collision: &collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let v = |key: &str| -> [f64; 3] {
             std::array::from_fn(|i| case[key][i].as_f64().unwrap_or(0.0))

crates/horizon-client/src/animate_tick.rs

@@ -612,6 +612,7 @@ fn do_animate_tick(
         facts: ctx.facts,
         collision: ctx.collision,
         player: None,
+        cached_chunk: std::cell::Cell::new(None),
     };
     engine.polytone_animate(&level, pos);
     let facts = ctx.facts.get(state);
@@ -1994,8 +1995,10 @@ pub fn campfire_particles<'a>(
         }
     }
 }
-/// `CampfireBlock.makeParticles` (always visible, overriding the limiter);
-/// `smoking` adds the plain smoke puff at the logs.
+/// `CampfireBlock.makeParticles`: the cosy or signal smoke through
+/// `addAlwaysVisibleParticle(.., true, ..)` (it overrides the limiter but still
+/// rolls the Particles option); `smoking` adds the plain smoke puff at the logs
+/// through `addParticle`, so the limiter can drop it.
 pub fn make_campfire_smoke(
     engine: &mut ParticleEngine,
     pos: [i32; 3],
@@ -2014,7 +2017,13 @@ pub fn make_campfire_smoke(
     } else {
         T::CampfireCosySmoke
     };
-    engine.create(&ParticleOptions::simple(ty), [x, y, z], [0.0, 0.07, 0.0]);
+    engine.add_with(
+        &ParticleOptions::simple(ty),
+        [x, y, z],
+        [0.0, 0.07, 0.0],
+        true,
+        true,
+    );
     if smoking {
         let r = engine.random();
         let dx = r.next_double() / 4.0 * sign(r);
@@ -2024,13 +2033,49 @@ pub fn make_campfire_smoke(
             f64::from(pos[1]) + 0.4,
             f64::from(pos[2]) + 0.5 + dz,
         ];
-        engine.create(&ParticleOptions::simple(T::Smoke), at, [0.0, 0.005, 0.0]);
+        add(engine, T::Smoke, at, [0.0, 0.005, 0.0]);
     }
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
+    /// `CampfireBlock.makeParticles` through `ClientLevel.doAddParticle`: the
+    /// cosy smoke overrides the limiter, the plain smoke does not, so it is
+    /// dropped beyond 32 blocks and at Particles: Minimal, and at Decreased
+    /// each puff is dropped when `calculateParticleLevel`'s `nextInt(3)` is 0.
+    #[test]
+    fn doused_campfire_smoke_goes_through_the_particle_limiter() {
+        use horizon_core::random::RandomSource as _;
+        use std::collections::{HashMap, HashSet};
+        let run = |level: u8, camera: [f64; 3]| {
+            let mut engine = ParticleEngine::new(Path::new(""), &HashMap::new(), &HashSet::new());
+            engine.seed_randoms(5, 9, 0);
+            engine.created_requests = Some(Vec::new());
+            engine.particle_level = level;
+            engine.camera = camera;
+            for _ in 0..20 {
+                make_campfire_smoke(&mut engine, [0, 64, 0], false, true);
+            }
+            let made = engine.created_requests.take().unwrap();
+            let count = |ty| made.iter().filter(|(o, ..)| o.ty == ty).count();
+            (count(T::CampfireCosySmoke), count(T::Smoke))
+        };
+        let near = [0.5, 65.0, 0.5];
+        assert_eq!(run(0, near), (20, 20), "All");
+        assert_eq!(run(2, near), (20, 0), "Minimal");
+        assert_eq!(run(0, [100.5, 65.0, 0.5]), (20, 0), "100 blocks away");
+        // Decreased: per puff the cosy smoke's roll, then the plain smoke's.
+        let mut level = LegacyRandom::new(9);
+        let kept = (0..20)
+            .filter(|_| {
+                level.next_int_bound(3).unwrap();
+                level.next_int_bound(3).unwrap() != 0
+            })
+            .count();
+        assert!(0 < kept && kept < 20);
+        assert_eq!(run(1, near), (20, kept), "Decreased");
+    }
     #[test]
     fn classifies_animated_blocks() {
         let none = |_: &str| None;

crates/horizon-client/src/client_lib.rs

@@ -19,13 +19,13 @@ pub use horizon_client_render::{
     hdr_calibration, hud, hud_kit, hud_layout, hud_overlays, inventory_effects, java_text,
     jigsaw_block, json_folder, level_loading, light, lod, logging, menu_blur, mesher, minimap,
     mipmap, mod_browser, mod_list, model_library, models, multiline_edit, native_emissive,
-    options_file, options_fixes, options_ui, overlay, pack_browser, pack_palette, pack_screen,
-    packs, pad_cursor, pad_glyph, par, particles, poi_sections, polytone_colors,
-    polytone_creative_tabs, polytone_post, post_chain, potent_sulfur, preedit, providers, pvp,
-    pvp_hud, random_source, screen_draw, screen_effects, sculk, section_mask, server_terrain,
-    settings, shader_options, shader_pack_list, signs, skins, social, sound_engine, sound_events,
-    sound_preview, spans, split_layout, split_map, split_profiles, sprites, streaming,
-    structure_block, tab_list, terrain_model, test_block, test_instance_block, testgen,
+    options_file, options_fixes, options_ui, overlay, pack_browser, pack_formats, pack_hooks,
+    pack_palette, pack_screen, packs, pad_cursor, pad_glyph, par, particles, poi_sections,
+    polytone_colors, polytone_creative_tabs, polytone_post, post_chain, potent_sulfur, preedit,
+    providers, pvp, pvp_hud, random_source, screen_draw, screen_effects, sculk, section_mask,
+    server_terrain, settings, shader_options, shader_pack_list, signs, skins, social, sound_engine,
+    sound_events, sound_preview, spans, split_layout, split_map, split_profiles, sprites,
+    streaming, structure_block, tab_list, terrain_model, test_block, test_instance_block, testgen,
     title_edition, trims, ui, vault, weather, widgets, world, worldborder, zip,
 };
 pub mod attack_strength;
@@ -70,7 +70,6 @@ pub mod falling_block;
 pub mod fire_render;
 pub mod first_person;
 pub mod flatgen;
-pub mod friends_screen;
 pub mod furnace;
 pub mod game_mode_switcher;
 pub mod game_rules_screen;
@@ -87,7 +86,6 @@ 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;
@@ -104,6 +102,8 @@ pub mod native_data;
 pub mod net;
 pub mod nether_portal;
 pub mod no_resources;
+#[cfg(feature = "horizon-extras")]
+pub mod official_servers;
 pub mod offline_name;
 pub mod old_world;
 pub mod osk;

crates/horizon-client/src/entities.rs

@@ -84,7 +84,7 @@ fn slime_at(world: &World, facts: &BlockFacts, position: BlockPos) -> bool {
 mod fluids;
 mod item_fall;
 mod item_no_physics;
-pub use fluids::{fluid_flow, update_entity_fluids, water_clip};
+pub use fluids::{fall_reset_hit, fluid_flow, update_entity_fluids, water_clip};
 
 #[cfg(test)]
 mod drop_motion_tests {

crates/horizon-client/src/entities/fluids.rs

@@ -45,6 +45,30 @@ pub fn fluid_flow(world: &World, fluids: &FluidResources, pos: [i32; 3]) -> [f64
     let flow = flow_at(&mut scene, state, at).unwrap_or(Vec3::ZERO);
     [flow.x, flow.y, flow.z]
 }
+/// `Entity.move`'s fall-reset ray along a move from `from`, up to 8 blocks:
+/// `ClipContext.Fluid.WATER` (the water's shape) and
+/// `ClipContext.Block.FALLDAMAGE_RESETTING` (a block `tagged` says is a reset
+/// block clips as a full block). Both shapes are queried for every visited
+/// block, the water's first (its first query fixes the shared cached shape);
+/// either one hitting ends the ray.
+pub fn fall_reset_hit(
+    world: &World,
+    fluids: &FluidResources,
+    tagged: impl Fn(BlockPos) -> bool,
+    from: Vec3,
+    moved: Vec3,
+) -> bool {
+    let to = from.add_vector(moved.normalize().scale(moved.length().min(8.0)));
+    let hit = horizon_core::geometry::traverse_blocks(from, to, 1_000_000, |p| {
+        let water = water_clip(world, fluids, from, to, p);
+        let reset = tagged(p)
+            && horizon_core::geometry::VoxelShape::block()
+                .clip(from, to, p)
+                .is_some();
+        (water || reset).then_some(())
+    });
+    matches!(hit, Ok(Some(())))
+}
 /// `ClipContext.Fluid.WATER` in a fall-reset ray through `p`: the water's
 /// shape from the shared `FlowingFluid.shapes` cache (the first query of a
 /// fluid state fixes its height), as the player's own ray reads it.

crates/horizon-client/src/entity_nbt.rs

@@ -233,7 +233,7 @@ fn is_animal(id: &str) -> bool {
 use crate::mobs::persistent_anger;
 /// The single player's UUID (`offline_uuid("Player")`): the entity the
 /// neutral mobs are angry at.
-fn player_uuid() -> [i32; 4] {
+pub(crate) fn player_uuid() -> [i32; 4] {
     let u = horizon_protocol::crypto::offline_uuid("Player");
     [
         (u >> 96) as u32 as i32,
@@ -1297,7 +1297,7 @@ pub fn mob_to_nbt(
             crate::mobs::nautilus::to_nbt(m, map);
         }
         "minecraft:sulfur_cube" => crate::mobs::sulfur_cube::to_nbt(m, map),
-        "minecraft:bee" => crate::mobs::bee::to_nbt(m, map),
+        "minecraft:bee" => crate::mobs::bee::to_nbt(m, map, &mut uuid_of),
         "minecraft:sniffer" => crate::mobs::sniffer::to_nbt(m, map),
         "minecraft:wither" => {
             map.insert("Invul".into(), Tag::Int(m.extra.counter));

crates/horizon-client/src/entry.rs

@@ -13,6 +13,8 @@ pub fn main_with(mods: crate::mod_api::Mods) {
         log::warn!("Trait mods already installed; ignoring the second list");
     }
     horizon_threads::configure_allocator();
+    // OptiFine's and Polytone's pack formats (platform, docs/layers.md), before any pack loads.
+    horizon_client::pack_formats::install();
     // horizon-extras (docs/forking.md): without the feature, no Horizon Settings or Mods page.
     if !cfg!(feature = "horizon-extras") {
         horizon_client::options_ui::HORIZON_EXTRAS
@@ -21,11 +23,9 @@ 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);
-    }
+    // Play with Friends' host side, until it moves to horizon-friends (spec #14167).
+    #[cfg(feature = "friends")]
+    game::register_friends();
     // 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

@@ -189,52 +189,6 @@ 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

@@ -237,7 +237,6 @@ mod llamas;
 mod loading_screen;
 mod loading_window;
 mod locator_bar;
-mod look;
 mod loom;
 mod mace;
 mod machines;
@@ -384,6 +383,7 @@ mod potions;
 mod powder_snow;
 mod prediction;
 mod pumpkin;
+mod pvp;
 mod quick_actions;
 mod raids;
 mod random_textures;
@@ -421,6 +421,7 @@ mod server_links;
 mod server_packs;
 mod server_travel;
 mod shader_packs;
+mod share_view;
 mod sheep_dye;
 mod shelf;
 mod shield;
@@ -467,6 +468,7 @@ mod trial_spawner;
 mod trial_visuals;
 mod trident;
 mod tutorial;
+mod tweaks;
 mod ui_control;
 mod use_hand;
 mod using_item;
@@ -596,6 +598,8 @@ use resource_loader::{
     EntityModels, GameCpuResources, Loaded, LoaderMsg, PendingWorldEntry, WorldRestLoader,
     run_loading, write_report,
 };
+#[cfg(feature = "friends")]
+pub(crate) use share_view::register_friends;
 use std::{
     cell::RefCell,
     collections::{HashMap, HashSet},
@@ -649,7 +653,7 @@ enum Screen {
     /// WorldOptionsScreen (game/lan_screen.rs).
     WorldOptions,
     /// Play with Friends, from the pause menu's Friends button
-    /// (`friends_screen`, game/friends.rs).
+    /// (game/friends.rs, game/friends/screen.rs).
     Friends,
     /// `SocialInteractionsScreen` (`social_screen`, game/social.rs).
     Social,
@@ -2017,8 +2021,8 @@ pub struct PackResources {
     clouds: Arc<(u32, u32, Vec<bool>)>,
     /// misc/forcefield.png: (width, height, RGBA) for the world border wall.
     forcefield: Arc<(u32, u32, Vec<u8>)>,
-    /// OptiFine custom sky layers (`optifine/sky`) with their textures; empty without them.
-    custom_sky: Arc<horizon_client::custom_sky::CustomSky>,
+    /// Custom sky layers (OptiFine's `optifine/sky`) with their textures; none without them.
+    custom_sky: Arc<dyn horizon_client::custom_sky::SkyLayers>,
     /// The overworld's, Nether's and End's attribute stacks with the packs' Polytone biome and
     /// dimension modifiers (#11486), when a pack has some: what the frame draws.
     environments: Option<Arc<[Environment; 3]>>,
@@ -2221,7 +2225,7 @@ 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: extras::mouse_tweaks::Tweaks,
+    tweaks: 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.
@@ -2810,9 +2814,10 @@ 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 (mods' minimap and counters; PvP & HUD's): `game/extras.rs`.
+    /// Horizon's extras (minimap, auto-reconnect; mods' counters): `game/extras.rs`.
     extras: extras::ExtrasState,
-    pvp: extras::pvp::PvpState,
+    /// The PvP & HUD options' state (`game/pvp.rs`).
+    pvp: 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.
@@ -2877,9 +2882,9 @@ 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 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,
+    /// The open connection joined from Realms: `ServerData.isRealm` for the friends
+    /// service's presence status.
+    realm_session: bool,
     /// Active packet replay session (game/studio.rs).
     pub(super) studio_replay: Option<horizon_client::studio::ReplayDriver>,
     pub(super) studio_freecam: horizon_client::studio::StudioFreecam,
@@ -2901,9 +2906,6 @@ struct Game<'a> {
     level_shapes: horizon_client::chunk::LevelShapes,
     /// This game is that server thread's (game/integrated.rs).
     serving: Option<integrated::Serving>,
-    /// The open world is shared behind an invite code (game/friends.rs).
-    #[cfg(feature = "friends")]
-    friends: Option<friends::Sharing>,
     /// The Social Interactions screen and the players whose chat is hidden (game/social.rs).
     social: social::Social,
     world_options: Option<lan_screen::WorldOptions>,
@@ -5488,34 +5490,6 @@ impl Game<'_> {
         );
         cancel
     }
-    /// The ticks the frame shows (animated textures, the HUD, a shader pack's clock): the
-    /// client's, or under `HORIZON_STILL` (`FixedStep::still`) the world's game time, which
-    /// moves only while the world runs.
-    pub(super) fn visual_ticks(&self) -> u64 {
-        if self.clock.still() {
-            self.world.game_time.max(0) as u64
-        } else {
-            self.ticks
-        }
-    }
-    /// The clock of the animated textures: `Minecraft.runTick` ticks the `TextureManager`
-    /// only while the level runs normally. Under `HORIZON_STILL` it is the world's ticks.
-    pub(super) fn texture_clock(&self) -> u64 {
-        if self.clock.still() {
-            self.visual_ticks()
-        } else {
-            self.texture_ticks
-        }
-    }
-    /// `Util.getMillis` for what the frame shows (the world border's scroll, the hearts' blink,
-    /// the glint's under the switch): under `HORIZON_STILL`, the world's ticks in milliseconds.
-    pub(super) fn visual_millis(&self) -> i64 {
-        if self.clock.still() {
-            self.visual_ticks() as i64 * 50
-        } else {
-            self.started.elapsed().as_millis() as i64
-        }
-    }
     /// `PresenceHandler.getPresenceStatus`: what an all-sharing player is doing, for
     /// the friends service's `updatePresence`.
     fn presence_status(&self) -> horizon_client::social::PresenceStatus {
@@ -5530,7 +5504,7 @@ impl Game<'_> {
             }
         } else if self.remote.is_some() {
             // `getCurrentServer().isRealm()`: the connection came from Realms.
-            if self.last_server.realm {
+            if self.realm_session {
                 PresenceStatus::PlayingRealms
             } else {
                 PresenceStatus::PlayingServer
@@ -5763,7 +5737,6 @@ impl Game<'_> {
         if let Some(log) = self.world.block_log.as_mut() {
             log.extend(held);
         }
-        self.tick_friends();
         horizon_client::spans::time("tick_hand", || self.tick_hand());
         horizon_client::spans::time("tick_sleep", || self.tick_sleep());
         self.announce_sleep_status();
@@ -5873,7 +5846,7 @@ 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.glint_texel();
+        batch.glint_colour = self.settings.extras.pvp.tweaks.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)
@@ -5986,7 +5959,8 @@ 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 indicator = if self.attack_indicator_hidden() {
+            let combat = self.settings.extras.pvp.combat;
+            let indicator = if combat.legacy && !combat.indicator {
                 0
             } else {
                 self.settings.attack_indicator
@@ -6050,7 +6024,7 @@ impl Game<'_> {
             });
             self.gui_layer("minecraft:effects", &mut batch, |g, batch| {
                 // The PvP & HUD effects widget takes the icons' place.
-                if !g.effect_icons_hidden() {
+                if !g.pvp_effects_shown() {
                     g.draw_effect_icons(batch);
                 }
             });
@@ -6485,7 +6459,7 @@ 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_container_extras(batch, ox, oy);
+        self.draw_sort_buttons(batch, ox, oy);
         self.draw_recipe_book(batch);
         let effect_tip = if self.container.is_none() && self.craft_size == 2 && !self.mount_active()
         {
@@ -9895,7 +9869,7 @@ impl Game<'_> {
             outline,
             outline_after_terrain,
             outline_high_contrast: self.settings.file.bool("highContrastBlockOutline"),
-            look: self.look_frame(),
+            pvp: self.settings.extras.pvp.frame(),
             debug_lines: &debug_lines,
             debug_lines_on_top: &debug_lines_on_top,
             debug_crosshair: &debug_crosshair,
@@ -10706,7 +10680,7 @@ impl Game<'_> {
                     if self.screen == Screen::Inventory
                         && d != 0.0
                         && !bundle
-                        && !self.container_scroll(d)
+                        && !self.tweak_scroll(d, self.inventory_target().0)
                     {
                         self.station_scroll(d);
                     }
@@ -10954,7 +10928,7 @@ impl Game<'_> {
                         return Ok(());
                     }
                     if pressed
-                        && (self.container_mouse_press(button)
+                        && (self.sort_mouse_press(button)
                             || self.hud_editor_key_press(&horizon_client::keybinds::mouse_name(
                                 button,
                             )))
@@ -11464,6 +11438,7 @@ impl Game<'_> {
                         // the world's own ticks.
                         horizon_client::social::set_presence_status(self.presence_status());
                         horizon_client::social::tick();
+                        self.share_tick();
                         // Minecraft.tick: ClientTickEvent.Pre before any of it.
                         self.native_client_tick_pre();
                         if self.title.is_none() && !self.pause {
@@ -11496,7 +11471,7 @@ impl Game<'_> {
                         }
                     }
                     self.extras_frame(elapsed);
-                    self.reconnect_when_due()?;
+                    self.extras_retry()?;
                     self.apply_mouse_look();
                     self.pad_look(elapsed.as_secs_f32());
                     self.advance_flight();
@@ -11607,7 +11582,7 @@ impl Game<'_> {
                             self.settings.simulation_distance,
                             self.settings.entity_distance,
                         );
-                        server.set_legacy_rules(self.pvp_legacy_rules());
+                        server.set_legacy_rules(self.settings.extras.pvp.combat.rules);
                     }
                     self.clock.end_frame(self.pause);
                     let mut consumed = false;
@@ -12207,7 +12182,7 @@ impl<'a> Game<'a> {
             persist: Default::default(),
             entity_attachments: Default::default(),
             remote: None,
-            last_server: Default::default(),
+            realm_session: false,
             studio_replay: None,
             studio_freecam: Default::default(),
             studio_timeline: Default::default(),
@@ -12231,8 +12206,6 @@ impl<'a> Game<'a> {
             test_defs_snapshot: false,
             test_highlights: HashMap::new(),
             game_tests: game_tests::GameTests::default(),
-            #[cfg(feature = "friends")]
-            friends: None,
             social: Default::default(),
             debug_keys: Default::default(),
             debug_charts: Default::default(),
@@ -12717,16 +12690,9 @@ pub fn run_with() -> Result<()> {
     if !options.offscreen && !synchronous_startup(&options) {
         let version = horizon_client::telemetry::version();
         horizon_hooks::engine::started(&horizon_hooks::Started::new(&version));
-        let player_dir = horizon_client::logging::player_dir();
         // horizon-extras: the official server is Horizon's (docs/forking.md).
-        if cfg!(feature = "horizon-extras")
-            && let Err(e) = horizon_client::multiplayer::add_official_server(&player_dir)
-        {
-            log::warn!("could not add the official server to servers.dat: {e}");
-        }
-        if let Err(e) = horizon_client::multiplayer::withdraw_partner_servers(&player_dir) {
-            log::warn!("could not take the withdrawn partner server out of servers.dat: {e}");
-        }
+        #[cfg(feature = "horizon-extras")]
+        horizon_client::official_servers::update(&horizon_client::logging::player_dir());
     }
     mods::register_components(&vanilla_root)?;
     mods::register_standalone_models();

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

@@ -686,23 +686,15 @@ impl Game<'_> {
         if fall == 0.0 || length < 1.0 {
             return fall;
         }
-        let to = from.add_vector(moved.normalize().scale(moved.length().min(8.0)));
         let reset = &self.res.motion().fall_reset;
-        let fluids = &self.res.motion().fluids;
-        let hit = horizon_core::geometry::traverse_blocks(from, to, 1_000_000, |p| {
-            // A tagged block clips as a full block, not its collider.
-            let name = &self.res.facts().get(self.world.block(p.x, p.y, p.z)).name;
-            if reset.contains(&**name) && VoxelShape::block().clip(from, to, p).is_some() {
-                return Some(());
-            }
-            // The water's shape, through the shared fluid shape cache.
-            horizon_client::entities::water_clip(&self.world, fluids, from, to, p).then_some(())
-        });
-        if matches!(hit, Ok(Some(()))) {
-            0.0
-        } else {
-            fall
-        }
+        let hit = horizon_client::entities::fall_reset_hit(
+            &self.world,
+            &self.res.motion().fluids,
+            |p| reset.contains(&*self.res.facts().get(self.world.block(p.x, p.y, p.z)).name),
+            from,
+            moved,
+        );
+        if hit { 0.0 } else { fall }
     }
     /// `AbstractBoat.checkFallDamage` after a move that went `moved_y` (with
     /// `b` already where it landed): on the ground the fall resets; a move

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

@@ -33,6 +33,8 @@ fn book_title_box() -> ui::EditBox {
     edit.bordered = false;
     edit.max_length = 15;
     edit.text_color = BLACK;
+    // BookSignScreen sets the title box centred.
+    edit.centered = true;
     edit.focused = true;
     edit
 }
@@ -68,6 +70,23 @@ pub(super) enum BookScreen {
         lectern: Option<(i32, i32, i32)>,
     },
 }
+impl BookScreen {
+    /// `BookSignScreen`'s constructor: its title box opens with the title
+    /// kept from the last time, which Cancel stored (`titleValue`).
+    fn begin_signing(&mut self) {
+        if let Self::Edit {
+            signing,
+            title,
+            title_edit,
+            ..
+        } = self
+        {
+            *signing = true;
+            title_edit.set_value(title.as_str());
+            title_edit.reset_blink();
+        }
+    }
+}
 /// The pages a book screen reads: a written book's components (so their
 /// click events stay), else a writable book's text.
 fn view_pages(data: Option<&StackData>) -> Vec<Text> {
@@ -986,7 +1005,7 @@ impl Game<'_> {
                     title,
                     ..
                 }) if !title.trim().is_empty() => self.save_book(true),
-                Some(BookScreen::Edit { signing, .. }) => *signing = true,
+                Some(book @ BookScreen::Edit { .. }) => book.begin_signing(),
                 _ => return Err("not a book and quill".into()),
             },
             Some("done") => match self.book.as_mut() {
@@ -1188,8 +1207,8 @@ impl Game<'_> {
                     self.turn_page(false);
                 } else if inside(w / 2.0 - 100.0, 196.0, 98.0, 20.0) {
                     click(self);
-                    if let Some(BookScreen::Edit { signing, .. }) = self.book.as_mut() {
-                        *signing = true;
+                    if let Some(book) = self.book.as_mut() {
+                        book.begin_signing();
                     }
                 } else if inside(w / 2.0 + 2.0, 196.0, 98.0, 20.0) {
                     click(self);
@@ -1618,6 +1637,19 @@ pub(super) fn lectern_signal(world: &horizon_client::world::World, pos: BlockPos
     }
 }
 
+#[cfg(test)]
+mod title_box_tests {
+    use super::book_title_box;
+
+    /// `BookSignScreen` sets its 15 character title box centred and unbordered.
+    #[test]
+    fn the_sign_title_box_is_centred() {
+        let edit = book_title_box();
+        assert!(edit.centered);
+        assert!(!edit.bordered);
+        assert_eq!(edit.max_length, 15);
+    }
+}
 #[cfg(test)]
 mod lectern_books_tag_tests {
     use super::super::native_machines::tests::server_game;
@@ -1794,3 +1826,46 @@ mod lectern_reach_tests {
         );
     }
 }
+
+#[cfg(test)]
+mod sign_tests {
+    use super::{BookScreen, book_page_box, book_title_box};
+
+    /// `BookSignScreen`'s constructor sets its title box to `titleValue`, what
+    /// Cancel kept; reopening the sign screen shows the title typed before,
+    /// not an empty box beside a stale `title`.
+    #[test]
+    fn the_sign_screen_opens_with_the_title_it_kept() {
+        let mut book = BookScreen::Edit {
+            slot: 0,
+            pages: vec!["page".into()],
+            page: 0,
+            signing: false,
+            title: "My Book".into(),
+            title_edit: book_title_box(),
+            page_edit: book_page_box(),
+        };
+        assert_eq!(book_title_value(&book), "");
+        book.begin_signing();
+        let BookScreen::Edit {
+            signing,
+            title,
+            title_edit,
+            ..
+        } = &book
+        else {
+            panic!("the book stays open");
+        };
+        assert!(signing);
+        assert_eq!(title.as_str(), "My Book");
+        assert_eq!(title_edit.value, "My Book");
+        assert_eq!(title_edit.cursor, 7);
+    }
+
+    fn book_title_value(book: &BookScreen) -> String {
+        match book {
+            BookScreen::Edit { title_edit, .. } => title_edit.value.clone(),
+            BookScreen::View { .. } => String::new(),
+        }
+    }
+}

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.chat_look().search
+        if self.settings.extras.pvp.chat.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.chat_look().copy
+        if self.settings.extras.pvp.chat.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.chat_look();
-        self.ui.chat.set_qol(&self.gui.atlas, self.chat_qol());
+        let options = self.settings.extras.pvp.chat;
+        self.ui.chat.set_qol(&self.gui.atlas, options.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/chat_filter.rs

@@ -42,8 +42,8 @@ impl Reply {
     }
 
     pub(super) fn duration(millis: i64) -> Text {
-        use horizon_chat_filter::DurationUnit;
-        let (count, unit) = horizon_chat_filter::duration_parts(millis);
+        use horizon_server_files::duration::{DurationUnit, duration_parts};
+        let (count, unit) = duration_parts(millis);
         let key = match (unit, count == 1) {
             (DurationUnit::Minute, true) => "horizon.moderation.duration.minute",
             (DurationUnit::Minute, false) => "horizon.moderation.duration.minutes",
@@ -93,7 +93,7 @@ pub(super) const MUTE_USAGES: [&str; 4] = [
 fn mute_time(words: &[&str]) -> (Option<i64>, usize) {
     match words
         .get(2)
-        .and_then(|w| horizon_chat_filter::parse_duration(w))
+        .and_then(|w| horizon_server_files::duration::parse_duration(w))
     {
         Some(ms) => (Some(ms), 3),
         None => (None, 2),
@@ -133,7 +133,7 @@ impl Game<'_> {
         count: u32,
         action: Action,
     ) {
-        let now = horizon_chat_filter::now_millis();
+        let now = horizon_server_files::duration::now_millis();
         let summary = format!(
             "[chat-filter] Refused {name}'s {} (hit {count}: {})",
             place.name(),
@@ -281,7 +281,7 @@ impl Game<'_> {
         let reason = |from: usize| (words.len() > from).then(|| words[from..].join(" "));
         match words {
             ["mutelist"] => {
-                let now = horizon_chat_filter::now_millis();
+                let now = horizon_server_files::duration::now_millis();
                 let mutes = host.hub.mutes();
                 if mutes.is_empty() {
                     return vec![Reply::translated("horizon.moderation.mutelist.empty", &[])];
@@ -319,13 +319,15 @@ impl Game<'_> {
                 let (time, from) = mute_time(words);
                 vec![self.mute(host, name, time, reason(from), by)]
             }
-            ["tempmute", name, time, ..] => match horizon_chat_filter::parse_duration(time) {
-                Some(ms) => vec![self.mute(host, name, Some(ms), reason(3), by)],
-                None => vec![Reply::translated(
-                    "horizon.moderation.invalid_duration",
-                    &[Text::literal(*time)],
-                )],
-            },
+            ["tempmute", name, time, ..] => {
+                match horizon_server_files::duration::parse_duration(time) {
+                    Some(ms) => vec![self.mute(host, name, Some(ms), reason(3), by)],
+                    None => vec![Reply::translated(
+                        "horizon.moderation.invalid_duration",
+                        &[Text::literal(*time)],
+                    )],
+                }
+            }
             ["mute", ..] => vec![Reply::translated("horizon.moderation.usage.mute", &[])],
             ["tempmute", ..] => vec![Reply::translated("horizon.moderation.usage.tempmute", &[])],
             ["unmute", ..] => vec![Reply::translated("horizon.moderation.usage.unmute", &[])],
@@ -353,10 +355,10 @@ impl Game<'_> {
         let Some((uuid, name)) = user else {
             return Reply::no_player();
         };
-        let until = time.map(|ms| horizon_chat_filter::now_millis() + ms);
+        let until = time.map(|ms| horizon_server_files::duration::now_millis() + ms);
         let what = time.map_or_else(
             || "until unmuted".into(),
-            |ms| format!("for {}", horizon_chat_filter::duration_text(ms)),
+            |ms| format!("for {}", horizon_server_files::duration::duration_text(ms)),
         );
         let why = reason
             .as_deref()

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

@@ -227,16 +227,16 @@ impl Game<'_> {
             );
         }
         for m in self.mobs.iter() {
-            if !m.alive() {
+            // A mob with no effects swirls nothing: skipped before its size
+            // is worked out, which every mob in a crowded world would pay
+            // for (#14053).
+            if !m.alive() || (m.extra.effect_particles.is_empty() && m.extra.effects.is_empty()) {
                 continue;
             }
             let size = (f64::from(m.width()), f64::from(m.height()));
             let invisible = m.invisible || m.has_effect("minecraft:invisibility");
             if m.extra.effect_particles.is_empty() {
                 // A mob of this game: its own effects, visible and not ambient.
-                if m.extra.effects.is_empty() {
-                    continue;
-                }
                 let list: Vec<_> = m
                     .extra
                     .effects

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

@@ -92,6 +92,7 @@ fn a_mods_fireworks_burst_and_bang_on_the_client_only() {
             facts: game.res.facts(),
             collision: game.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         game.particles.tick(&level);
     };

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

@@ -1567,11 +1567,11 @@ impl Game<'_> {
             "streaming": self.streaming.stages().into_iter().map(|(k, v)| (k.to_string(), v.into())).collect::<serde_json::Map<_, _>>(),
             "dirty_light": self.world.dirty_light.len(),
             "renderer": renderer,
-            "display": self.window.as_deref().and_then(horizon_client::telemetry::monitor).map(|m| json!({
-                "width": m.size().width,
-                "height": m.size().height,
-                "scale": m.scale_factor(),
-                "refresh_hz": m.refresh_rate_millihertz().map(|r| r.div_ceil(1000)),
+            "display": self.window.as_deref().and_then(horizon_client::window::display).map(|d| json!({
+                "width": d.width,
+                "height": d.height,
+                "scale": d.scale,
+                "refresh_hz": d.refresh_hz,
             })),
             "uptime_seconds": self.started.elapsed().as_secs_f64(),
             "server": self.remote_status(),

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

@@ -2,8 +2,10 @@
 //! chunk-generation spawning (`NaturalSpawner`), mob events (attacks,
 //! breeding, conversions, drops), projectiles, player interactions
 //! (feeding, shearing, milking, spawn eggs, throwing) and rendering.
+mod mob_geometry;
 mod projectile_world;
 mod pufferfish_player;
+mod spawn_eggs;
 
 use super::{
     Dim, Game, Hand, InteractTarget, entity_culling::EntityCullDecision,
@@ -7450,171 +7452,6 @@ impl Game<'_> {
         }
         Ok(true)
     }
-    /// `Mob.checkAndHandleImportantInteractions` with a spawn egg of mob
-    /// `index`'s own kind (`SpawnEggItem.spawnOffspringFromSpawnEgg`): a baby
-    /// at the mob's feet, taking the parent's variant as `getBreedOffspring`
-    /// does, and one egg used. False (PASS) when the mob has no baby form.
-    fn spawn_egg_offspring(&mut self, index: usize) -> bool {
-        let Some(stack) = self.held().cloned() else {
-            return false;
-        };
-        let parent = &self.mobs[index];
-        if !parent.alive()
-            || !horizon_client::mobs::finalize::spawn_egg_is_for(&stack.item, &parent.kind.id)
-            || !horizon_client::mobs::species::can_be_a_baby(parent.species())
-            // WanderingTrader.getBreedOffspring returns null: no offspring, the
-            // click carries on to trading.
-            || parent.species() == Species::WanderingTrader
-        {
-            return false;
-        }
-        let (kind, at) = (
-            parent.kind.id.clone(),
-            [parent.position.x, parent.position.y, parent.position.z],
-        );
-        let (species, variant, color) =
-            (parent.species(), parent.extra.variant, parent.extra.color);
-        let target = self.mob_entity(&self.mobs[index]);
-        // SpawnEggItem.spawnOffspringFromSpawnEgg: `type.create(level, SPAWN_ITEM_USE)`
-        // creates the baby without finalizeSpawn, and `snapTo(pos, 0, 0)` faces
-        // it south without a level-random draw.
-        let Some(id) =
-            self.spawn_mob_internal(&kind, at, false, false, false, false, SpawnYaw::Fixed(0.0))
-        else {
-            return false;
-        };
-        if let Some(child) = self.mobs.iter_mut().find(|m| m.id == id) {
-            horizon_client::mobs::finalize::spawn_egg_offspring(child, species, variant, color);
-        }
-        // `Mob.checkAndHandleImportantInteractions` then calls
-        // `onOffspringSpawnedFromEgg`: `Fox`'s makes the baby trust the player
-        // who used the egg (a fox egg used on a block trusts nobody).
-        if species == Species::Fox {
-            let spawner = self.acting_player_uuid();
-            if let Some(child) = self.mobs.iter_mut().find(|m| m.id == id) {
-                horizon_client::mobs::fox::add_trusted_entity(child, spawner);
-            }
-        }
-        self.trigger_item_entity("minecraft:player_interacted_with_entity", &stack, &target);
-        self.consume_held();
-        true
-    }
-    /// `SpawnEggItem.use`: the SOURCE_ONLY ray must hit a liquid block.
-    pub(super) fn spawn_egg_fluid_hit(&self) -> Option<super::Hit> {
-        let hit = self.bucket_hit()?;
-        matches!(
-            &*self.block_name(hit.pos),
-            "minecraft:water" | "minecraft:lava"
-        )
-        .then_some(hit)
-    }
-    /// Shared peaceful-mode eligibility for spawn eggs.
-    pub(super) fn spawn_egg_allowed(&self, item: &str) -> bool {
-        let kind = item.trim_end_matches("_spawn_egg");
-        self.ui.difficulty != 0
-            || self
-                .res
-                .mob_types()
-                .get(kind)
-                .is_none_or(|t| horizon_client::mobs::spawn_rules::allowed_in_peaceful(t.species))
-    }
-    /// `SpawnEggItem.useOn` for a block, or `use` for a fluid source.
-    fn use_spawn_egg(&mut self, stack: &ItemStack) -> Result<bool> {
-        let fluid = matches!(self.guest_use, Some(super::GuestUse::Item(_)));
-        let Some(hit) = (if fluid {
-            self.spawn_egg_fluid_hit()
-        } else {
-            self.pick()
-        }) else {
-            return Ok(false);
-        };
-        let kind = stack.item.trim_end_matches("_spawn_egg").to_owned();
-        if !self.spawn_egg_allowed(&stack.item) {
-            self.use_failed = true;
-            return Ok(true);
-        }
-        if fluid
-            && !self.may_build()
-            && !self.can_place_on_in_adventure([
-                hit.pos[0] - hit.face[0],
-                hit.pos[1] - hit.face[1],
-                hit.pos[2] - hit.face[2],
-            ])
-        {
-            self.use_failed = true;
-            return Ok(true);
-        }
-        // SpawnEggItem.useOn on a spawner sets its mob (and an op's egg data).
-        let (spawner_id, data) = horizon_client::block_entity_item::spawn_egg_on_spawner(
-            stack,
-            self.acting_player_is_op(),
-        );
-        if let Some(done) = self.use_spawn_egg_on_spawner(hit.pos, &spawner_id, data.as_ref()) {
-            if done {
-                self.swing_arm();
-                self.award_stat("used", &stack.item, 1);
-                self.consume_held();
-            }
-            return Ok(true);
-        }
-        // useOn: a clicked block without a collision shape (vines, grass)
-        // takes the mob itself, any other the one on the clicked face.
-        let p = if fluid || self.collision_empty(hit.pos) {
-            hit.pos
-        } else {
-            [
-                hit.pos[0] + hit.face[0],
-                hit.pos[1] + hit.face[1],
-                hit.pos[2] + hit.face[2],
-            ]
-        };
-        let at = [
-            f64::from(p[0]) + 0.5,
-            f64::from(p[1]),
-            f64::from(p[2]) + 0.5,
-        ];
-        // SpawnEggItem.spawnMob: `EntityType.spawn`.
-        let Some(id) = self.spawn_mob_spawned(&kind, at, SpawnYaw::Created) else {
-            return Ok(false);
-        };
-        // SpawnEggItem.spawnMob: `EntityType.create` finalizes the mob, then
-        // `PostSpawnProcessor` puts the egg's components on it.
-        if let Some(m) = self.mobs.iter_mut().find(|m| m.id == id) {
-            horizon_client::entity_nbt::apply_item_components(m, stack);
-        }
-        self.apply_spawn_egg_entity_data(id, stack);
-        self.post_block_game_event("minecraft:entity_place", p, Some(Who::Player), None);
-        self.award_stat("used", &stack.item, 1);
-        self.swing_arm();
-        if !self.creative
-            && let Some(s) = self.held_mut().as_mut()
-        {
-            s.count -= 1;
-            if s.count == 0 {
-                *self.held_mut() = None;
-            }
-        }
-        Ok(true)
-    }
-    /// `EntityType.updateCustomEntityTag`: the egg's `minecraft:entity_data` on
-    /// the mob it spawned, once the guards let it through, as
-    /// `TypedEntityData.loadInto`: the mob's own compound, the data merged over
-    /// it, loaded back into the same mob (`/data merge entity`'s loader).
-    pub(super) fn apply_spawn_egg_entity_data(&mut self, id: u32, stack: &ItemStack) {
-        let Some(i) = self.mobs.iter().position(|m| m.id == id) else {
-            return;
-        };
-        let kind = self.mobs[i].kind.id.clone();
-        let op = self.acting_player_is_op();
-        let Some(data) = horizon_client::block_entity_item::spawn_egg_entity_data(stack, &kind, op)
-        else {
-            return;
-        };
-        let own = self.mob_tree_nbt(i);
-        let tag = horizon_client::data_cmd::merged(&own, data);
-        // Nothing to report: the mob's own compound always loads back.
-        let _ = self.apply_entity_nbt(super::commands::Target::Mob(id), tag);
-    }
     /// A beam target's centre (half its height), interpolated.
     fn beam_target(&self, who: Option<Who>, alpha: f64) -> Option<glam::DVec3> {
         match who? {
@@ -7785,624 +7622,6 @@ impl Game<'_> {
             }
         }
     }
-
-    pub(super) fn mob_geometry(&self, camera: glam::DVec3, alpha: f64, out: &mut Vec<Vertex>) {
-        // The coarse mob bounds pay off only in dense async scenes; otherwise,
-        // keep the existing exact mesh-culling path.
-        if self.settings.horizon.entity_culling == EntityCullingMode::Asynchronous
-            && self
-                .async_occlusion_culler
-                .as_ref()
-                .is_some_and(|culler| culler.camera_is_stationary())
-            && self.settings.horizon.entity_culling_precheck != 0
-            && self.mobs.len() >= self.settings.horizon.entity_culling_precheck as usize
-            && !self.pack_shadow_casters.0
-            && horizon_client::mod_api::mods().is_empty()
-        {
-            self.mob_geometry_inner::<true>(camera, alpha, out);
-        } else {
-            self.mob_geometry_inner::<false>(camera, alpha, out);
-        }
-    }
-
-    fn mob_geometry_inner<const PRECHECK: bool>(
-        &self,
-        camera: glam::DVec3,
-        alpha: f64,
-        out: &mut Vec<Vertex>,
-    ) {
-        let atlas = &self.gui.atlas;
-        let lookup = |name: &str| atlas.sprites.get(name).map(|r| [r.u0, r.v0, r.u1, r.v1]);
-        let scale = self.view_scale();
-        self.rendered_mobs.set(0);
-        let skinning = self.skinning();
-        // What custom entity model animations read of the frame.
-        horizon_client::mobs::cem_anim::set_frame(horizon_client::mobs::cem_anim::Frame {
-            time: self.world.game_time as f64 + alpha,
-            day_time: self.world.day_time as f64 + alpha,
-            dimension: match self.dim {
-                Dim::Overworld => 0.0,
-                Dim::Nether => -1.0,
-                Dim::End => 1.0,
-            },
-            player: self.player.as_ref().map_or(camera.to_array(), |p| {
-                [p.position.x, p.position.y, p.position.z]
-            }),
-            player_rot: [self.pitch, self.yaw],
-            paused: self.pause,
-            first_person: self.camera_type.first_person(),
-            third_person_reversed: self.camera_type
-                == super::perspective::CameraType::ThirdPersonFront,
-            ..Default::default()
-        });
-        for mob in &self.mobs {
-            // LevelRenderer: the entity the view looks out of is not drawn
-            // in first person.
-            if self.hides_as_camera(mob.id) {
-                continue;
-            }
-            let is_player = &*mob.kind.id == "minecraft:player";
-            let d = glam::DVec3::new(mob.position.x, mob.position.y, mob.position.z) - camera;
-            // Entity.shouldRenderAtSqrDistance: 64 times the bounding box's
-            // mean edge, scaled by the view scale. RemotePlayer's box counts
-            // ten times.
-            let (w, h, _) = mob.dims();
-            let edge = (w + h + w) / 3.0 * if is_player { 10.0 } else { 1.0 };
-            let range = edge * 64.0 * scale;
-            if d.length_squared() >= range * range {
-                continue;
-            }
-            let beam = horizon_client::mobs::guardian::beam(mob, alpha as f32);
-            // EntityRenderer.shouldRender: the renderer's interpolated culling box,
-            // grown by 0.5 (GuardianRenderer also draws while its beam is out).
-            if let Some(view) = &self.view_frustum
-                && beam.is_none()
-            {
-                let (lo, hi) = super::entity_culling::cull_box(mob, alpha);
-                let (lo, hi) = (
-                    (lo - camera - glam::DVec3::splat(0.5)).as_vec3(),
-                    (hi - camera + glam::DVec3::splat(0.5)).as_vec3(),
-                );
-                if !view.intersects(lo, hi) {
-                    continue;
-                }
-            }
-            let outline = self.mob_outline(mob);
-            // Entity.DATA_SHARED_FLAGS_ID invisible: only the name tag draws (and
-            // the outline of a glowing mob, LivingEntityRenderer.getRenderType).
-            // A player keeps its armour, elytra and held items
-            // (`LivingEntityRenderer.submit` skips only the body).
-            let layers_only = mob.invisible && outline.is_none() && is_player;
-            if mob.invisible && outline.is_none() && !layers_only {
-                continue;
-            }
-            let culling = if PRECHECK
-                && outline.is_none()
-                && !is_player
-                && mob.kind.id.starts_with("minecraft:")
-                && [
-                    &mob.extra.head,
-                    &mob.extra.chest,
-                    &mob.extra.legs,
-                    &mob.extra.feet,
-                    &mob.extra.main_hand,
-                    &mob.extra.off_hand,
-                ]
-                .iter()
-                .all(|item| item.is_none())
-                && beam.is_none()
-            {
-                self.entity_cull_decision(mob, alpha)
-            } else {
-                EntityCullDecision::CheckVertices
-            };
-            if culling.hides_entity() {
-                continue;
-            }
-            let entity_start = out.len();
-            self.mark_motion(entity_start, (1 << 32) | u64::from(mob.id));
-            self.mark_entity(entity_start, &mob.kind.id);
-            self.rendered_mobs.set(self.rendered_mobs.get() + 1);
-            // `EntityRenderer.getPackedLightCoords`: the block the mob's light
-            // probe (its eye) is in, at the position this frame draws rather
-            // than this tick's.
-            let probe = mob.light_probe(alpha);
-            let light = self.world.light(probe[0], probe[1], probe[2]);
-            let mut packed = (u32::from(light >> 4) * 16) | ((u32::from(light & 15) * 16) << 8);
-            // EntityRenderer.getBlockLightLevel: a burning mob has 15 block
-            // light, and so do the Allay, Blaze, Magma Cube, Vex and Wither
-            // renderers' overrides; the sky light stays the level's.
-            if mob.fire_ticks > 0
-                || matches!(
-                    mob.species(),
-                    Species::Allay
-                        | Species::Blaze
-                        | Species::MagmaCube
-                        | Species::Vex
-                        | Species::Wither
-                )
-            {
-                packed = (packed & 0xFF) | ((15 * 16) << 8);
-            }
-            // GlowSquidRenderer.getBlockLightLevel: the body brightens as the
-            // dark ticks run out (the block light is the second byte).
-            if mob.species() == Species::GlowSquid {
-                let lit = (packed >> 12) & 15;
-                let block = horizon_client::mobs::aquatic::glow_squid_block_light(mob, lit);
-                packed = (packed & 0xFF) | ((block * 16) << 8);
-            }
-            // A native mod's own model in place of the vanilla one
-            // (`native_mob_submit`), before any of the vanilla model's parts
-            // (a sulfur cube's swallowed block) are drawn.
-            // A player's own hook (`native_player_submit`) is asked for the
-            // other players in view.
-            let who = is_player
-                .then(|| self.remote_player_name(mob.id))
-                .flatten()
-                .map(|name| NativePlayerRender { name, local: false });
-            let modded = if layers_only {
-                false
-            } else if let Some(who) = who {
-                self.mod_player_geometry(mob, who, alpha as f32, camera, packed, out)
-            } else {
-                !is_player && self.mod_mob_geometry(mob, alpha as f32, camera, packed, out)
-            };
-            if modded {
-                if let Some(rgb) = outline {
-                    self.mark_outline(&out[entity_start..], rgb);
-                    if mob.invisible {
-                        out.truncate(entity_start);
-                        continue;
-                    }
-                }
-                if outline.is_none() {
-                    self.cull_entity_vertices(out, entity_start);
-                }
-                continue;
-            }
-            if mob.species() == Species::SulfurCube
-                && !horizon_client::mobs::trader::is_invisible(mob)
-            {
-                self.sulfur_cube_body_geometry(
-                    mob,
-                    alpha as f32,
-                    horizon_client::mobs::render::base_transform(mob, alpha as f32, camera),
-                    packed,
-                    out,
-                );
-            }
-            // Other players on a server: PlayerRenderer's HumanoidArmorLayer.
-            let armor = if is_player {
-                self.worn_armor_layers(mob)
-            } else {
-                Vec::new()
-            };
-            let body = out.len();
-            // The GPU path: an ordinary mob, no layers the CPU path changes after drawing them
-            // (a player's, the HDR tiers below, the sulfur cube's shell). A glowing mob's
-            // silhouette is posed too (`SkinFrame::outline_since`), unless it is invisible:
-            // then only the outline draws.
-            let silhouette_on_gpu = outline.is_none() || !mob.invisible;
-            let posable = skinning
-                && !is_player
-                && !layers_only
-                && silhouette_on_gpu
-                && armor.is_empty()
-                && !matches!(
-                    mob.species(),
-                    Species::Blaze | Species::MagmaCube | Species::GlowSquid | Species::SulfurCube
-                );
-            let mut skinned = None;
-            if posable {
-                let mut models = self.skin_models.borrow_mut();
-                let mut frame = self.skin_frame.borrow_mut();
-                let mark = frame.mark();
-                let mut skin = horizon_client::mobs::skin::Skin::new(&mut models, &mut frame);
-                horizon_client::mobs::render::render_skinned(
-                    mob,
-                    alpha as f32,
-                    camera,
-                    &lookup,
-                    packed,
-                    self.res.mob_data(),
-                    out,
-                    &mut skin,
-                );
-                skinned = Some((mark, skin.bounds));
-            } else {
-                let render = if layers_only {
-                    horizon_client::mobs::render::render_layers
-                } else {
-                    horizon_client::mobs::render::render_with
-                };
-                render(
-                    mob,
-                    alpha as f32,
-                    camera,
-                    &lookup,
-                    packed,
-                    self.res.mob_data(),
-                    &armor,
-                    out,
-                );
-            }
-            // HDR output: mobs that are light shine by their kind, as blocks do (entity.wgsl
-            // fs_hdr_mark); a tier's window lifts only their bright texels.
-            if let Some(tier) = match mob.species() {
-                Species::Blaze => Some(horizon_client::mesher::BRIGHT),
-                Species::MagmaCube | Species::GlowSquid => Some(horizon_client::mesher::LOW),
-                _ => None,
-            } {
-                for v in &mut out[body..] {
-                    v.layer |= u32::from(tier) << 16;
-                }
-            }
-            // AvatarRenderer.shouldRenderLayers: a spectator draws no layers.
-            let layers = horizon_client::mobs::render::layers_shown(mob);
-            if is_player && layers {
-                // PlayerRenderer's CapeLayer, WingsLayer, ParrotOnShoulderLayer
-                // and SpinAttackEffectLayer. Only the cape hides with the body;
-                // the others have no `isInvisible` check.
-                let chest = mob.extra.chest.as_deref();
-                if !layers_only {
-                    self.player_cape_geometry(mob, chest, camera, alpha as f32, packed, out);
-                }
-                if let Some((_, name)) = self
-                    .remote_player_names()
-                    .into_iter()
-                    .find(|(id, _)| *id == mob.id)
-                {
-                    self.player_ears_geometry(mob, &name, camera, alpha as f32, packed, out);
-                }
-                self.player_elytra_geometry(mob, chest, camera, alpha as f32, packed, out);
-                self.shoulder_parrots_geometry(mob, camera, alpha as f32, packed, out);
-                self.spin_attack_geometry(mob, camera, alpha as f32, packed, out);
-                self.stuck_in_body_geometry(mob, mob.id as i32, camera, alpha as f32, packed, out);
-            }
-            // Cosmetics (game/cosmetics.rs), posed on the GPU with the mob's own jobs: culled
-            // with it.
-            if !layers_only
-                && super::cosmetics::enabled()
-                && (is_player || &*mob.kind.id == "minecraft:mannequin")
-            {
-                let mark = self.skin_frame.borrow().mark();
-                let base = horizon_client::mobs::render::base_transform(mob, alpha as f32, camera);
-                let gpu = skinning;
-                if let Some((lo, hi)) = self.cosmetics_geometry(
-                    mob,
-                    false,
-                    base,
-                    Some(camera),
-                    alpha as f32,
-                    packed,
-                    gpu,
-                    out,
-                ) {
-                    skinned = Some(match skinned {
-                        Some((first, Some((l, h)))) => (first, Some((l.min(lo), h.max(hi)))),
-                        Some((first, None)) => (first, Some((lo, hi))),
-                        None => (mark, Some((lo, hi))),
-                    });
-                }
-            }
-            // CustomHeadLayer (a pumpkin, skull or head item) included.
-            if layers {
-                // Held items join the GPU path's draws, their silhouette too.
-                let skin = (skinning && silhouette_on_gpu).then_some(&mut skinned);
-                self.mob_block_geometry(mob, camera, alpha, packed, skin, out);
-                // `native_mob_layer`: a native mod's layer, over the vanilla ones.
-                self.mod_mob_layer_geometry(mob, who, alpha as f32, camera, packed, out);
-            }
-            if let Some(rgb) = outline {
-                self.mark_outline(&out[entity_start..], rgb);
-                if let Some(((first, _, _), _)) = skinned {
-                    let color = horizon_client::mobs::render::abgr(rgb);
-                    self.skin_frame.borrow_mut().outline_since(first, color);
-                }
-                if mob.invisible {
-                    out.truncate(entity_start);
-                    continue;
-                }
-            }
-            // Glowing outlines and a guardian's beam remain visible independently
-            // of whether the body is hidden behind terrain.
-            if outline.is_none() && culling.checks_vertices() && beam.is_none() {
-                // What the GPU draws of the mob counts by its bounds' corners.
-                self.cull_skinned(out, entity_start, skinned);
-            }
-            // GuardianRenderer: the laser to the locked target.
-            if let Some((time, scale)) = beam
-                && let Some(target) = self.beam_target(mob.ai.target, alpha)
-                && let Some(uv) = lookup("entity/guardian/guardian_beam")
-            {
-                let a = alpha;
-                let eye = glam::DVec3::new(
-                    mob.previous.x + (mob.position.x - mob.previous.x) * a,
-                    mob.previous.y + (mob.position.y - mob.previous.y) * a + mob.eye_height(),
-                    mob.previous.z + (mob.position.z - mob.previous.z) * a,
-                ) - camera;
-                horizon_client::mobs::guardian::beam_geometry(
-                    eye.as_vec3(),
-                    (target - camera).as_vec3(),
-                    time,
-                    scale,
-                    uv,
-                    out,
-                );
-            }
-        }
-        // What follows isn't a tracked mob: close the last one's span.
-        self.mark_motion(out.len(), 0);
-        self.elder_apparition_geometry(alpha, out);
-        self.spawner_geometry(camera, alpha, out);
-        // Projectiles: the baked vanilla arrow model, the rest as item billboards.
-        let (right, up) = thrown_item_axes(self.camera_type, self.yaw, self.pitch);
-        let live = self.creatures.projectiles.iter().map(|a| {
-            let at = [
-                a.previous.x + (a.position.x - a.previous.x) * alpha,
-                a.previous.y + (a.position.y - a.previous.y) * alpha,
-                a.previous.z + (a.position.z - a.previous.z) * alpha,
-            ];
-            (a, at)
-        });
-        // ItemPickupParticle: a picked-up arrow flying to its collector.
-        let taken = self.pickups.live.iter().filter_map(|p| match &p.taken {
-            super::pickups::Taken::Arrow(a) => Some((&**a, super::pickups::position(p, alpha))),
-            _ => None,
-        });
-        // A glowing projectile's outline: what it drew up to the next one.
-        let mut glowing = None;
-        for (a, at) in live.chain(taken) {
-            if let Some((start, rgb)) = glowing.take() {
-                self.mark_outline(&out[start..], rgb);
-            }
-            if a.id != 0
-                && let Some(rgb) = self.thing_outline(a.id, a.kind.id())
-            {
-                glowing = Some((out.len(), rgb));
-            }
-            let p = glam::DVec3::from_array(at) - camera;
-            let c = p.as_vec3();
-            // EntityRenderer.getPackedLightCoords: the block its light probe
-            // (the eye) is in, at the position this frame draws rather than
-            // this tick's, and not the one under its feet.
-            let light = self.world.light(
-                at[0].floor() as i32,
-                a.light_probe_y(alpha).floor() as i32,
-                at[2].floor() as i32,
-            );
-            let mut packed = (u32::from(light >> 4) * 16) | ((u32::from(light & 15) * 16) << 8);
-            // EntityRenderer.getBlockLightLevel: a shulker bullet and anything
-            // on fire are drawn at 15 block light (the fireball renderers'
-            // own override); the sky light stays the level's.
-            if let Some(block) = a.block_light_override() {
-                packed = (packed & 0xFF) | (u32::from(block) * 16) << 8;
-            }
-            if a.is_arrow() {
-                let Some(model) = self.arrow_model.as_ref() else {
-                    continue;
-                };
-                // SpectralArrowRenderer, and TippableArrowRenderer's `getColor() > 0`.
-                let texture = if a.is_spectral_arrow() {
-                    "entity/projectiles/arrow_spectral"
-                } else if a.arrow.as_ref().is_some_and(|s| s.effect_color > 0) {
-                    "entity/projectiles/arrow_tipped"
-                } else {
-                    "entity/projectiles/arrow"
-                };
-                let Some(r) = atlas.sprites.get(texture).copied() else {
-                    continue;
-                };
-                // ArrowRenderer: `Mth.lerp(partialTick, state.yRotO, state.yRot)`
-                // and the same for the pitch, so a turning arrow is drawn
-                // between the two ticks it turned over.
-                let alpha32 = alpha as f32;
-                let yaw = a.previous_yaw + alpha32 * (a.yaw - a.previous_yaw);
-                let pitch = a.previous_pitch + alpha32 * (a.pitch - a.previous_pitch);
-                let m = glam::Mat4::from_translation(c)
-                    * glam::Mat4::from_rotation_y((yaw - 90.0).to_radians())
-                    * glam::Mat4::from_rotation_z(pitch.to_radians());
-                // ArrowRenderer: `state.shake = shakeTime - partialTicks`; ArrowModel.setupAnim
-                // rolls the root while the shake timer runs.
-                let shake = a
-                    .arrow
-                    .as_ref()
-                    .map_or(0.0, |s| s.shake as f32 - alpha as f32);
-                let roll = if shake > 0.0 {
-                    -(shake * 3.0).msin() * shake * (std::f32::consts::PI / 180.0)
-                } else {
-                    0.0
-                };
-                let pose_for = |part: &horizon_client::mobs::Part| {
-                    let mut pose = part.pose;
-                    if std::ptr::eq(part, model) {
-                        pose[5] += roll;
-                    }
-                    pose
-                };
-                horizon_client::mobs::render_model(
-                    model,
-                    m,
-                    &pose_for,
-                    [r.u0, r.v0, r.u1, r.v1],
-                    packed,
-                    0,
-                    out,
-                );
-                if a.arrow.as_ref().is_some_and(|s| s.on_fire()) {
-                    flame_geometry(atlas, c, 0.5, 0.5, self.yaw, light, out);
-                }
-                continue;
-            }
-            // ThrownTridentRenderer.
-            if matches!(a.kind, ProjectileKind::Trident) {
-                let Some(model) = self.trident_model.as_ref() else {
-                    continue;
-                };
-                let Some(r) = atlas.sprites.get("entity/trident/trident").copied() else {
-                    continue;
-                };
-                let m = glam::Mat4::from_translation(c)
-                    * glam::Mat4::from_rotation_y((a.yaw - 90.0).to_radians())
-                    * glam::Mat4::from_rotation_z((a.pitch + 90.0).to_radians());
-                let poses = horizon_client::mobs::anim::Poses::new(model);
-                horizon_client::mobs::render::draw(
-                    model,
-                    m,
-                    &poses,
-                    [r.u0, r.v0, r.u1, r.v1],
-                    0xFFFF_FFFF,
-                    packed,
-                    0,
-                    out,
-                );
-                continue;
-            }
-            // WindChargeRenderer.
-            if matches!(
-                a.kind,
-                ProjectileKind::WindCharge | ProjectileKind::BreezeWindCharge
-            ) {
-                self.wind_charge_geometry(a, c, packed, alpha as f32, out);
-                continue;
-            }
-            // ShulkerBulletRenderer: the tumbling bullet model, then a larger
-            // translucent copy of it (colour 0x26FFFFFF); always 15 block light.
-            if matches!(a.kind, ProjectileKind::ShulkerBullet { .. }) {
-                let model = &self.entity_models.shulker_bullet;
-                if let (Some(model), Some(r)) =
-                    (model, atlas.sprites.get("entity/shulker/spark").copied())
-                {
-                    use horizon_core::geometry::trig;
-                    let tc = a.age as f32 + alpha as f32;
-                    let mut poses = horizon_client::mobs::anim::Poses::new(model);
-                    poses.yrot("main", a.yaw.to_radians());
-                    poses.xrot("main", a.pitch.to_radians());
-                    let light = (packed & 0xFF) | ((15 * 16) << 8);
-                    let base = glam::Mat4::from_translation(c)
-                        * glam::Mat4::from_translation(glam::Vec3::new(0.0, 0.15, 0.0))
-                        * glam::Mat4::from_rotation_y(
-                            (trig::sin(f64::from(tc * 0.1)) * 180.0).to_radians(),
-                        )
-                        * glam::Mat4::from_rotation_x(
-                            (trig::cos(f64::from(tc * 0.1)) * 180.0).to_radians(),
-                        )
-                        * glam::Mat4::from_rotation_z(
-                            (trig::sin(f64::from(tc * 0.15)) * 360.0).to_radians(),
-                        )
-                        * glam::Mat4::from_scale(glam::Vec3::new(-0.5, -0.5, 0.5));
-                    let uv = [r.u0, r.v0, r.u1, r.v1];
-                    horizon_client::mobs::render::draw(
-                        model,
-                        base,
-                        &poses,
-                        uv,
-                        0xFFFF_FFFF,
-                        light,
-                        0,
-                        out,
-                    );
-                    // The translucent shell blends over the opaque core
-                    // (`RenderTypes.entityTranslucent`).
-                    let shell = out.len();
-                    horizon_client::mobs::render::draw(
-                        model,
-                        base * glam::Mat4::from_scale(glam::Vec3::splat(1.5)),
-                        &poses,
-                        uv,
-                        0x26FF_FFFF,
-                        light,
-                        0,
-                        out,
-                    );
-                    horizon_client::gfx::mark_oit(&mut out[shell..]);
-                }
-                continue;
-            }
-            // WitherSkullRenderer: the skull model facing its flight.
-            if let Some(dangerous) = super::wither::skull_kind(a) {
-                let model = &self.entity_models.wither_skull;
-                let tex = if dangerous {
-                    "entity/wither/wither_invulnerable"
-                } else {
-                    "entity/wither/wither"
-                };
-                if let (Some(model), Some(r)) = (model, atlas.sprites.get(tex).copied()) {
-                    let mut poses = horizon_client::mobs::anim::Poses::new(model);
-                    poses.yrot("head", a.yaw.to_radians());
-                    poses.xrot("head", a.pitch.to_radians());
-                    let base = glam::Mat4::from_translation(c)
-                        * glam::Mat4::from_scale(glam::Vec3::new(-1.0, -1.0, 1.0));
-                    horizon_client::mobs::render::draw(
-                        model,
-                        base,
-                        &poses,
-                        [r.u0, r.v0, r.u1, r.v1],
-                        0xFFFF_FFFF,
-                        packed,
-                        0,
-                        out,
-                    );
-                }
-                continue;
-            }
-            if let Some(stack) = a.drawn_item() {
-                let owner = super::item_draw::owner_at(at, 0.0, a.kind.id());
-                let state = self.resolve_item(&stack, DisplayContext::Ground, Some(&owner), 0);
-                let pose = glam::Mat4::from_translation(c)
-                    * glam::Mat4::from_quat(self.camera_orientation());
-                self.submit_item_world(&state, pose, packed, out);
-                continue;
-            }
-            // `Entity.displayFireAnimation`: a thrown item that flew through a
-            // fire block burns (`ThrowableProjectile.tick`'s
-            // `applyEffectsFromBlocks`), and ThrownItemRenderer draws the flame
-            // over its box as any other entity renderer does.
-            if a.on_fire() {
-                let size = a.kind.size() as f32;
-                flame_geometry(atlas, c, size, size, self.yaw, light, out);
-            }
-            // `ThrownItemRenderer` for a fireball: the item `Fireball.getItem`
-            // returns (a fire charge until `setItem` gave it another), its model
-            // at the renderer's scale for the kind. `packed` is already 15, the
-            // renderer's full bright.
-            if let Some(stack) = a.item.as_ref() {
-                let owner = super::item_draw::owner_at(at, 0.0, a.kind.id());
-                let state = self.resolve_item(stack, DisplayContext::Ground, Some(&owner), 0);
-                let pose = glam::Mat4::from_translation(c)
-                    * glam::Mat4::from_quat(self.camera_orientation())
-                    * glam::Mat4::from_scale(glam::Vec3::splat(a.sprite_scale()));
-                self.submit_item_world(&state, pose, packed, out);
-                continue;
-            }
-            let Some(name) = a.item_sprite() else {
-                continue;
-            };
-            let Some(r) = atlas.sprites.get(name).copied() else {
-                continue;
-            };
-            let lift = is_item_billboard(&a.kind);
-            let quad = thrown_item_quad(c, right, up, a.sprite_scale(), lift);
-            for (v, uv) in quad
-                .iter()
-                .zip([[r.u0, r.v1], [r.u1, r.v1], [r.u1, r.v0], [r.u0, r.v0]])
-            {
-                out.push(Vertex {
-                    normal: [0; 4],
-                    pos: v.to_array(),
-                    uv,
-                    layer: 0,
-                    color: 0xFFFF_FFFF,
-                    light: packed,
-
-                    glint_uv: [0.0, 0.0],
-                });
-            }
-        }
-        if let Some((start, rgb)) = glowing {
-            self.mark_outline(&out[start..], rgb);
-        }
-    }
 }
 /// `ThrownItemRenderer.submit` turns the item by `CameraRenderState.orientation`
 /// (`Camera.setRotation`): the billboard's right and up axes are the camera's.

crates/horizon-client/src/game/creatures/mob_geometry.rs

@@ -0,0 +1,629 @@
+//! Drawing the mobs, players and projectiles the client sees, each frame (`mob_geometry`).
+use super::*;
+
+impl Game<'_> {
+    pub(in crate::game) fn mob_geometry(
+        &self,
+        camera: glam::DVec3,
+        alpha: f64,
+        out: &mut Vec<Vertex>,
+    ) {
+        // The coarse mob bounds pay off only in dense async scenes; otherwise,
+        // keep the existing exact mesh-culling path.
+        if self.settings.horizon.entity_culling == EntityCullingMode::Asynchronous
+            && self
+                .async_occlusion_culler
+                .as_ref()
+                .is_some_and(|culler| culler.camera_is_stationary())
+            && self.settings.horizon.entity_culling_precheck != 0
+            && self.mobs.len() >= self.settings.horizon.entity_culling_precheck as usize
+            && !self.pack_shadow_casters.0
+            && horizon_client::mod_api::mods().is_empty()
+        {
+            self.mob_geometry_inner::<true>(camera, alpha, out);
+        } else {
+            self.mob_geometry_inner::<false>(camera, alpha, out);
+        }
+    }
+
+    fn mob_geometry_inner<const PRECHECK: bool>(
+        &self,
+        camera: glam::DVec3,
+        alpha: f64,
+        out: &mut Vec<Vertex>,
+    ) {
+        let atlas = &self.gui.atlas;
+        let lookup = |name: &str| atlas.sprites.get(name).map(|r| [r.u0, r.v0, r.u1, r.v1]);
+        let scale = self.view_scale();
+        self.rendered_mobs.set(0);
+        let skinning = self.skinning();
+        // What custom entity model animations read of the frame.
+        horizon_client::mobs::cem_anim::set_frame(horizon_client::mobs::cem_anim::Frame {
+            time: self.world.game_time as f64 + alpha,
+            day_time: self.world.day_time as f64 + alpha,
+            dimension: match self.dim {
+                Dim::Overworld => 0.0,
+                Dim::Nether => -1.0,
+                Dim::End => 1.0,
+            },
+            player: self.player.as_ref().map_or(camera.to_array(), |p| {
+                [p.position.x, p.position.y, p.position.z]
+            }),
+            player_rot: [self.pitch, self.yaw],
+            paused: self.pause,
+            first_person: self.camera_type.first_person(),
+            third_person_reversed: self.camera_type
+                == super::super::perspective::CameraType::ThirdPersonFront,
+            ..Default::default()
+        });
+        for mob in &self.mobs {
+            // LevelRenderer: the entity the view looks out of is not drawn
+            // in first person.
+            if self.hides_as_camera(mob.id) {
+                continue;
+            }
+            let is_player = &*mob.kind.id == "minecraft:player";
+            let d = glam::DVec3::new(mob.position.x, mob.position.y, mob.position.z) - camera;
+            // Entity.shouldRenderAtSqrDistance: 64 times the bounding box's
+            // mean edge, scaled by the view scale. RemotePlayer's box counts
+            // ten times.
+            let (w, h, _) = mob.dims();
+            let edge = (w + h + w) / 3.0 * if is_player { 10.0 } else { 1.0 };
+            let range = edge * 64.0 * scale;
+            if d.length_squared() >= range * range {
+                continue;
+            }
+            let beam = horizon_client::mobs::guardian::beam(mob, alpha as f32);
+            // EntityRenderer.shouldRender: the renderer's interpolated culling box,
+            // grown by 0.5 (GuardianRenderer also draws while its beam is out).
+            if let Some(view) = &self.view_frustum
+                && beam.is_none()
+            {
+                let (lo, hi) = super::super::entity_culling::cull_box(mob, alpha);
+                let (lo, hi) = (
+                    (lo - camera - glam::DVec3::splat(0.5)).as_vec3(),
+                    (hi - camera + glam::DVec3::splat(0.5)).as_vec3(),
+                );
+                if !view.intersects(lo, hi) {
+                    continue;
+                }
+            }
+            let outline = self.mob_outline(mob);
+            // Entity.DATA_SHARED_FLAGS_ID invisible: only the name tag draws (and
+            // the outline of a glowing mob, LivingEntityRenderer.getRenderType).
+            // A player keeps its armour, elytra and held items
+            // (`LivingEntityRenderer.submit` skips only the body).
+            let layers_only = mob.invisible && outline.is_none() && is_player;
+            if mob.invisible && outline.is_none() && !layers_only {
+                continue;
+            }
+            let culling = if PRECHECK
+                && outline.is_none()
+                && !is_player
+                && mob.kind.id.starts_with("minecraft:")
+                && [
+                    &mob.extra.head,
+                    &mob.extra.chest,
+                    &mob.extra.legs,
+                    &mob.extra.feet,
+                    &mob.extra.main_hand,
+                    &mob.extra.off_hand,
+                ]
+                .iter()
+                .all(|item| item.is_none())
+                && beam.is_none()
+            {
+                self.entity_cull_decision(mob, alpha)
+            } else {
+                EntityCullDecision::CheckVertices
+            };
+            if culling.hides_entity() {
+                continue;
+            }
+            let entity_start = out.len();
+            self.mark_motion(entity_start, (1 << 32) | u64::from(mob.id));
+            self.mark_entity(entity_start, &mob.kind.id);
+            self.rendered_mobs.set(self.rendered_mobs.get() + 1);
+            // `EntityRenderer.getPackedLightCoords`: the block the mob's light
+            // probe (its eye) is in, at the position this frame draws rather
+            // than this tick's.
+            let probe = mob.light_probe(alpha);
+            let light = self.world.light(probe[0], probe[1], probe[2]);
+            let mut packed = (u32::from(light >> 4) * 16) | ((u32::from(light & 15) * 16) << 8);
+            // EntityRenderer.getBlockLightLevel: a burning mob has 15 block
+            // light, and so do the Allay, Blaze, Magma Cube, Vex and Wither
+            // renderers' overrides; the sky light stays the level's.
+            if mob.fire_ticks > 0
+                || matches!(
+                    mob.species(),
+                    Species::Allay
+                        | Species::Blaze
+                        | Species::MagmaCube
+                        | Species::Vex
+                        | Species::Wither
+                )
+            {
+                packed = (packed & 0xFF) | ((15 * 16) << 8);
+            }
+            // GlowSquidRenderer.getBlockLightLevel: the body brightens as the
+            // dark ticks run out (the block light is the second byte).
+            if mob.species() == Species::GlowSquid {
+                let lit = (packed >> 12) & 15;
+                let block = horizon_client::mobs::aquatic::glow_squid_block_light(mob, lit);
+                packed = (packed & 0xFF) | ((block * 16) << 8);
+            }
+            // A native mod's own model in place of the vanilla one
+            // (`native_mob_submit`), before any of the vanilla model's parts
+            // (a sulfur cube's swallowed block) are drawn.
+            // A player's own hook (`native_player_submit`) is asked for the
+            // other players in view.
+            let who = is_player
+                .then(|| self.remote_player_name(mob.id))
+                .flatten()
+                .map(|name| NativePlayerRender { name, local: false });
+            let modded = if layers_only {
+                false
+            } else if let Some(who) = who {
+                self.mod_player_geometry(mob, who, alpha as f32, camera, packed, out)
+            } else {
+                !is_player && self.mod_mob_geometry(mob, alpha as f32, camera, packed, out)
+            };
+            if modded {
+                if let Some(rgb) = outline {
+                    self.mark_outline(&out[entity_start..], rgb);
+                    if mob.invisible {
+                        out.truncate(entity_start);
+                        continue;
+                    }
+                }
+                if outline.is_none() {
+                    self.cull_entity_vertices(out, entity_start);
+                }
+                continue;
+            }
+            if mob.species() == Species::SulfurCube
+                && !horizon_client::mobs::trader::is_invisible(mob)
+            {
+                self.sulfur_cube_body_geometry(
+                    mob,
+                    alpha as f32,
+                    horizon_client::mobs::render::base_transform(mob, alpha as f32, camera),
+                    packed,
+                    out,
+                );
+            }
+            // Other players on a server: PlayerRenderer's HumanoidArmorLayer.
+            let armor = if is_player {
+                self.worn_armor_layers(mob)
+            } else {
+                Vec::new()
+            };
+            let body = out.len();
+            // The GPU path: an ordinary mob, no layers the CPU path changes after drawing them
+            // (a player's, the HDR tiers below, the sulfur cube's shell). A glowing mob's
+            // silhouette is posed too (`SkinFrame::outline_since`), unless it is invisible:
+            // then only the outline draws.
+            let silhouette_on_gpu = outline.is_none() || !mob.invisible;
+            let posable = skinning
+                && !is_player
+                && !layers_only
+                && silhouette_on_gpu
+                && armor.is_empty()
+                && !matches!(
+                    mob.species(),
+                    Species::Blaze | Species::MagmaCube | Species::GlowSquid | Species::SulfurCube
+                );
+            let mut skinned = None;
+            if posable {
+                let mut models = self.skin_models.borrow_mut();
+                let mut frame = self.skin_frame.borrow_mut();
+                let mark = frame.mark();
+                let mut skin = horizon_client::mobs::skin::Skin::new(&mut models, &mut frame);
+                horizon_client::mobs::render::render_skinned(
+                    mob,
+                    alpha as f32,
+                    camera,
+                    &lookup,
+                    packed,
+                    self.res.mob_data(),
+                    out,
+                    &mut skin,
+                );
+                skinned = Some((mark, skin.bounds));
+            } else {
+                let render = if layers_only {
+                    horizon_client::mobs::render::render_layers
+                } else {
+                    horizon_client::mobs::render::render_with
+                };
+                render(
+                    mob,
+                    alpha as f32,
+                    camera,
+                    &lookup,
+                    packed,
+                    self.res.mob_data(),
+                    &armor,
+                    out,
+                );
+            }
+            // HDR output: mobs that are light shine by their kind, as blocks do (entity.wgsl
+            // fs_hdr_mark); a tier's window lifts only their bright texels.
+            if let Some(tier) = match mob.species() {
+                Species::Blaze => Some(horizon_client::mesher::BRIGHT),
+                Species::MagmaCube | Species::GlowSquid => Some(horizon_client::mesher::LOW),
+                _ => None,
+            } {
+                for v in &mut out[body..] {
+                    v.layer |= u32::from(tier) << 16;
+                }
+            }
+            // AvatarRenderer.shouldRenderLayers: a spectator draws no layers.
+            let layers = horizon_client::mobs::render::layers_shown(mob);
+            if is_player && layers {
+                // PlayerRenderer's CapeLayer, WingsLayer, ParrotOnShoulderLayer
+                // and SpinAttackEffectLayer. Only the cape hides with the body;
+                // the others have no `isInvisible` check.
+                let chest = mob.extra.chest.as_deref();
+                if !layers_only {
+                    self.player_cape_geometry(mob, chest, camera, alpha as f32, packed, out);
+                }
+                if let Some((_, name)) = self
+                    .remote_player_names()
+                    .into_iter()
+                    .find(|(id, _)| *id == mob.id)
+                {
+                    self.player_ears_geometry(mob, &name, camera, alpha as f32, packed, out);
+                }
+                self.player_elytra_geometry(mob, chest, camera, alpha as f32, packed, out);
+                self.shoulder_parrots_geometry(mob, camera, alpha as f32, packed, out);
+                self.spin_attack_geometry(mob, camera, alpha as f32, packed, out);
+                self.stuck_in_body_geometry(mob, mob.id as i32, camera, alpha as f32, packed, out);
+            }
+            // Cosmetics (game/cosmetics.rs), posed on the GPU with the mob's own jobs: culled
+            // with it.
+            if !layers_only
+                && super::super::cosmetics::enabled()
+                && (is_player || &*mob.kind.id == "minecraft:mannequin")
+            {
+                let mark = self.skin_frame.borrow().mark();
+                let base = horizon_client::mobs::render::base_transform(mob, alpha as f32, camera);
+                let gpu = skinning;
+                if let Some((lo, hi)) = self.cosmetics_geometry(
+                    mob,
+                    false,
+                    base,
+                    Some(camera),
+                    alpha as f32,
+                    packed,
+                    gpu,
+                    out,
+                ) {
+                    skinned = Some(match skinned {
+                        Some((first, Some((l, h)))) => (first, Some((l.min(lo), h.max(hi)))),
+                        Some((first, None)) => (first, Some((lo, hi))),
+                        None => (mark, Some((lo, hi))),
+                    });
+                }
+            }
+            // CustomHeadLayer (a pumpkin, skull or head item) included.
+            if layers {
+                // Held items join the GPU path's draws, their silhouette too.
+                let skin = (skinning && silhouette_on_gpu).then_some(&mut skinned);
+                self.mob_block_geometry(mob, camera, alpha, packed, skin, out);
+                // `native_mob_layer`: a native mod's layer, over the vanilla ones.
+                self.mod_mob_layer_geometry(mob, who, alpha as f32, camera, packed, out);
+            }
+            if let Some(rgb) = outline {
+                self.mark_outline(&out[entity_start..], rgb);
+                if let Some(((first, _, _), _)) = skinned {
+                    let color = horizon_client::mobs::render::abgr(rgb);
+                    self.skin_frame.borrow_mut().outline_since(first, color);
+                }
+                if mob.invisible {
+                    out.truncate(entity_start);
+                    continue;
+                }
+            }
+            // Glowing outlines and a guardian's beam remain visible independently
+            // of whether the body is hidden behind terrain.
+            if outline.is_none() && culling.checks_vertices() && beam.is_none() {
+                // What the GPU draws of the mob counts by its bounds' corners.
+                self.cull_skinned(out, entity_start, skinned);
+            }
+            // GuardianRenderer: the laser to the locked target.
+            if let Some((time, scale)) = beam
+                && let Some(target) = self.beam_target(mob.ai.target, alpha)
+                && let Some(uv) = lookup("entity/guardian/guardian_beam")
+            {
+                let a = alpha;
+                let eye = glam::DVec3::new(
+                    mob.previous.x + (mob.position.x - mob.previous.x) * a,
+                    mob.previous.y + (mob.position.y - mob.previous.y) * a + mob.eye_height(),
+                    mob.previous.z + (mob.position.z - mob.previous.z) * a,
+                ) - camera;
+                horizon_client::mobs::guardian::beam_geometry(
+                    eye.as_vec3(),
+                    (target - camera).as_vec3(),
+                    time,
+                    scale,
+                    uv,
+                    out,
+                );
+            }
+        }
+        // What follows isn't a tracked mob: close the last one's span.
+        self.mark_motion(out.len(), 0);
+        self.elder_apparition_geometry(alpha, out);
+        self.spawner_geometry(camera, alpha, out);
+        // Projectiles: the baked vanilla arrow model, the rest as item billboards.
+        let (right, up) = thrown_item_axes(self.camera_type, self.yaw, self.pitch);
+        let live = self.creatures.projectiles.iter().map(|a| {
+            let at = [
+                a.previous.x + (a.position.x - a.previous.x) * alpha,
+                a.previous.y + (a.position.y - a.previous.y) * alpha,
+                a.previous.z + (a.position.z - a.previous.z) * alpha,
+            ];
+            (a, at)
+        });
+        // ItemPickupParticle: a picked-up arrow flying to its collector.
+        let taken = self.pickups.live.iter().filter_map(|p| match &p.taken {
+            super::super::pickups::Taken::Arrow(a) => {
+                Some((&**a, super::super::pickups::position(p, alpha)))
+            }
+            _ => None,
+        });
+        // A glowing projectile's outline: what it drew up to the next one.
+        let mut glowing = None;
+        for (a, at) in live.chain(taken) {
+            if let Some((start, rgb)) = glowing.take() {
+                self.mark_outline(&out[start..], rgb);
+            }
+            if a.id != 0
+                && let Some(rgb) = self.thing_outline(a.id, a.kind.id())
+            {
+                glowing = Some((out.len(), rgb));
+            }
+            let p = glam::DVec3::from_array(at) - camera;
+            let c = p.as_vec3();
+            // EntityRenderer.getPackedLightCoords: the block its light probe
+            // (the eye) is in, at the position this frame draws rather than
+            // this tick's, and not the one under its feet.
+            let light = self.world.light(
+                at[0].floor() as i32,
+                a.light_probe_y(alpha).floor() as i32,
+                at[2].floor() as i32,
+            );
+            let mut packed = (u32::from(light >> 4) * 16) | ((u32::from(light & 15) * 16) << 8);
+            // EntityRenderer.getBlockLightLevel: a shulker bullet and anything
+            // on fire are drawn at 15 block light (the fireball renderers'
+            // own override); the sky light stays the level's.
+            if let Some(block) = a.block_light_override() {
+                packed = (packed & 0xFF) | (u32::from(block) * 16) << 8;
+            }
+            if a.is_arrow() {
+                let Some(model) = self.arrow_model.as_ref() else {
+                    continue;
+                };
+                // SpectralArrowRenderer, and TippableArrowRenderer's `getColor() > 0`.
+                let texture = if a.is_spectral_arrow() {
+                    "entity/projectiles/arrow_spectral"
+                } else if a.arrow.as_ref().is_some_and(|s| s.effect_color > 0) {
+                    "entity/projectiles/arrow_tipped"
+                } else {
+                    "entity/projectiles/arrow"
+                };
+                let Some(r) = atlas.sprites.get(texture).copied() else {
+                    continue;
+                };
+                // ArrowRenderer: `Mth.lerp(partialTick, state.yRotO, state.yRot)`
+                // and the same for the pitch, so a turning arrow is drawn
+                // between the two ticks it turned over.
+                let alpha32 = alpha as f32;
+                let yaw = a.previous_yaw + alpha32 * (a.yaw - a.previous_yaw);
+                let pitch = a.previous_pitch + alpha32 * (a.pitch - a.previous_pitch);
+                let m = glam::Mat4::from_translation(c)
+                    * glam::Mat4::from_rotation_y((yaw - 90.0).to_radians())
+                    * glam::Mat4::from_rotation_z(pitch.to_radians());
+                // ArrowRenderer: `state.shake = shakeTime - partialTicks`; ArrowModel.setupAnim
+                // rolls the root while the shake timer runs.
+                let shake = a
+                    .arrow
+                    .as_ref()
+                    .map_or(0.0, |s| s.shake as f32 - alpha as f32);
+                let roll = if shake > 0.0 {
+                    -(shake * 3.0).msin() * shake * (std::f32::consts::PI / 180.0)
+                } else {
+                    0.0
+                };
+                let pose_for = |part: &horizon_client::mobs::Part| {
+                    let mut pose = part.pose;
+                    if std::ptr::eq(part, model) {
+                        pose[5] += roll;
+                    }
+                    pose
+                };
+                horizon_client::mobs::render_model(
+                    model,
+                    m,
+                    &pose_for,
+                    [r.u0, r.v0, r.u1, r.v1],
+                    packed,
+                    0,
+                    out,
+                );
+                if a.arrow.as_ref().is_some_and(|s| s.on_fire()) {
+                    flame_geometry(atlas, c, 0.5, 0.5, self.yaw, light, out);
+                }
+                continue;
+            }
+            // ThrownTridentRenderer.
+            if matches!(a.kind, ProjectileKind::Trident) {
+                let Some(model) = self.trident_model.as_ref() else {
+                    continue;
+                };
+                let Some(r) = atlas.sprites.get("entity/trident/trident").copied() else {
+                    continue;
+                };
+                let m = glam::Mat4::from_translation(c)
+                    * glam::Mat4::from_rotation_y((a.yaw - 90.0).to_radians())
+                    * glam::Mat4::from_rotation_z((a.pitch + 90.0).to_radians());
+                let poses = horizon_client::mobs::anim::Poses::new(model);
+                horizon_client::mobs::render::draw(
+                    model,
+                    m,
+                    &poses,
+                    [r.u0, r.v0, r.u1, r.v1],
+                    0xFFFF_FFFF,
+                    packed,
+                    0,
+                    out,
+                );
+                continue;
+            }
+            // WindChargeRenderer.
+            if matches!(
+                a.kind,
+                ProjectileKind::WindCharge | ProjectileKind::BreezeWindCharge
+            ) {
+                self.wind_charge_geometry(a, c, packed, alpha as f32, out);
+                continue;
+            }
+            // ShulkerBulletRenderer: the tumbling bullet model, then a larger
+            // translucent copy of it (colour 0x26FFFFFF); always 15 block light.
+            if matches!(a.kind, ProjectileKind::ShulkerBullet { .. }) {
+                let model = &self.entity_models.shulker_bullet;
+                if let (Some(model), Some(r)) =
+                    (model, atlas.sprites.get("entity/shulker/spark").copied())
+                {
+                    use horizon_core::geometry::trig;
+                    let tc = a.age as f32 + alpha as f32;
+                    let mut poses = horizon_client::mobs::anim::Poses::new(model);
+                    poses.yrot("main", a.yaw.to_radians());
+                    poses.xrot("main", a.pitch.to_radians());
+                    let light = (packed & 0xFF) | ((15 * 16) << 8);
+                    let base = glam::Mat4::from_translation(c)
+                        * glam::Mat4::from_translation(glam::Vec3::new(0.0, 0.15, 0.0))
+                        * glam::Mat4::from_rotation_y(
+                            (trig::sin(f64::from(tc * 0.1)) * 180.0).to_radians(),
+                        )
+                        * glam::Mat4::from_rotation_x(
+                            (trig::cos(f64::from(tc * 0.1)) * 180.0).to_radians(),
+                        )
+                        * glam::Mat4::from_rotation_z(
+                            (trig::sin(f64::from(tc * 0.15)) * 360.0).to_radians(),
+                        )
+                        * glam::Mat4::from_scale(glam::Vec3::new(-0.5, -0.5, 0.5));
+                    let uv = [r.u0, r.v0, r.u1, r.v1];
+                    horizon_client::mobs::render::draw(
+                        model,
+                        base,
+                        &poses,
+                        uv,
+                        0xFFFF_FFFF,
+                        light,
+                        0,
+                        out,
+                    );
+                    // The translucent shell blends over the opaque core
+                    // (`RenderTypes.entityTranslucent`).
+                    let shell = out.len();
+                    horizon_client::mobs::render::draw(
+                        model,
+                        base * glam::Mat4::from_scale(glam::Vec3::splat(1.5)),
+                        &poses,
+                        uv,
+                        0x26FF_FFFF,
+                        light,
+                        0,
+                        out,
+                    );
+                    horizon_client::gfx::mark_oit(&mut out[shell..]);
+                }
+                continue;
+            }
+            // WitherSkullRenderer: the skull model facing its flight.
+            if let Some(dangerous) = super::super::wither::skull_kind(a) {
+                let model = &self.entity_models.wither_skull;
+                let tex = if dangerous {
+                    "entity/wither/wither_invulnerable"
+                } else {
+                    "entity/wither/wither"
+                };
+                if let (Some(model), Some(r)) = (model, atlas.sprites.get(tex).copied()) {
+                    let mut poses = horizon_client::mobs::anim::Poses::new(model);
+                    poses.yrot("head", a.yaw.to_radians());
+                    poses.xrot("head", a.pitch.to_radians());
+                    let base = glam::Mat4::from_translation(c)
+                        * glam::Mat4::from_scale(glam::Vec3::new(-1.0, -1.0, 1.0));
+                    horizon_client::mobs::render::draw(
+                        model,
+                        base,
+                        &poses,
+                        [r.u0, r.v0, r.u1, r.v1],
+                        0xFFFF_FFFF,
+                        packed,
+                        0,
+                        out,
+                    );
+                }
+                continue;
+            }
+            if let Some(stack) = a.drawn_item() {
+                let owner = super::super::item_draw::owner_at(at, 0.0, a.kind.id());
+                let state = self.resolve_item(&stack, DisplayContext::Ground, Some(&owner), 0);
+                let pose = glam::Mat4::from_translation(c)
+                    * glam::Mat4::from_quat(self.camera_orientation());
+                self.submit_item_world(&state, pose, packed, out);
+                continue;
+            }
+            // `Entity.displayFireAnimation`: a thrown item that flew through a
+            // fire block burns (`ThrowableProjectile.tick`'s
+            // `applyEffectsFromBlocks`), and ThrownItemRenderer draws the flame
+            // over its box as any other entity renderer does.
+            if a.on_fire() {
+                let size = a.kind.size() as f32;
+                flame_geometry(atlas, c, size, size, self.yaw, light, out);
+            }
+            // `ThrownItemRenderer` for a fireball: the item `Fireball.getItem`
+            // returns (a fire charge until `setItem` gave it another), its model
+            // at the renderer's scale for the kind. `packed` is already 15, the
+            // renderer's full bright.
+            if let Some(stack) = a.item.as_ref() {
+                let owner = super::super::item_draw::owner_at(at, 0.0, a.kind.id());
+                let state = self.resolve_item(stack, DisplayContext::Ground, Some(&owner), 0);
+                let pose = glam::Mat4::from_translation(c)
+                    * glam::Mat4::from_quat(self.camera_orientation())
+                    * glam::Mat4::from_scale(glam::Vec3::splat(a.sprite_scale()));
+                self.submit_item_world(&state, pose, packed, out);
+                continue;
+            }
+            let Some(name) = a.item_sprite() else {
+                continue;
+            };
+            let Some(r) = atlas.sprites.get(name).copied() else {
+                continue;
+            };
+            let lift = is_item_billboard(&a.kind);
+            let quad = thrown_item_quad(c, right, up, a.sprite_scale(), lift);
+            for (v, uv) in quad
+                .iter()
+                .zip([[r.u0, r.v1], [r.u1, r.v1], [r.u1, r.v0], [r.u0, r.v0]])
+            {
+                out.push(Vertex {
+                    normal: [0; 4],
+                    pos: v.to_array(),
+                    uv,
+                    layer: 0,
+                    color: 0xFFFF_FFFF,
+                    light: packed,
+
+                    glint_uv: [0.0, 0.0],
+                });
+            }
+        }
+        if let Some((start, rgb)) = glowing {
+            self.mark_outline(&out[start..], rgb);
+        }
+    }
+}

crates/horizon-client/src/game/creatures/spawn_eggs.rs

@@ -0,0 +1,171 @@
+//! Spawn eggs: a baby from an egg used on its own kind, an egg used on a block or a fluid, and the
+//! egg's entity data on the mob it spawned.
+use super::*;
+
+impl Game<'_> {
+    /// `Mob.checkAndHandleImportantInteractions` with a spawn egg of mob
+    /// `index`'s own kind (`SpawnEggItem.spawnOffspringFromSpawnEgg`): a baby
+    /// at the mob's feet, taking the parent's variant as `getBreedOffspring`
+    /// does, and one egg used. False (PASS) when the mob has no baby form.
+    pub(super) fn spawn_egg_offspring(&mut self, index: usize) -> bool {
+        let Some(stack) = self.held().cloned() else {
+            return false;
+        };
+        let parent = &self.mobs[index];
+        if !parent.alive()
+            || !horizon_client::mobs::finalize::spawn_egg_is_for(&stack.item, &parent.kind.id)
+            || !horizon_client::mobs::species::can_be_a_baby(parent.species())
+            // WanderingTrader.getBreedOffspring returns null: no offspring, the
+            // click carries on to trading.
+            || parent.species() == Species::WanderingTrader
+        {
+            return false;
+        }
+        let (kind, at) = (
+            parent.kind.id.clone(),
+            [parent.position.x, parent.position.y, parent.position.z],
+        );
+        let (species, variant, color) =
+            (parent.species(), parent.extra.variant, parent.extra.color);
+        let target = self.mob_entity(&self.mobs[index]);
+        // SpawnEggItem.spawnOffspringFromSpawnEgg: `type.create(level, SPAWN_ITEM_USE)`
+        // creates the baby without finalizeSpawn, and `snapTo(pos, 0, 0)` faces
+        // it south without a level-random draw.
+        let Some(id) =
+            self.spawn_mob_internal(&kind, at, false, false, false, false, SpawnYaw::Fixed(0.0))
+        else {
+            return false;
+        };
+        if let Some(child) = self.mobs.iter_mut().find(|m| m.id == id) {
+            horizon_client::mobs::finalize::spawn_egg_offspring(child, species, variant, color);
+        }
+        // `Mob.checkAndHandleImportantInteractions` then calls
+        // `onOffspringSpawnedFromEgg`: `Fox`'s makes the baby trust the player
+        // who used the egg (a fox egg used on a block trusts nobody).
+        if species == Species::Fox {
+            let spawner = self.acting_player_uuid();
+            if let Some(child) = self.mobs.iter_mut().find(|m| m.id == id) {
+                horizon_client::mobs::fox::add_trusted_entity(child, spawner);
+            }
+        }
+        self.trigger_item_entity("minecraft:player_interacted_with_entity", &stack, &target);
+        self.consume_held();
+        true
+    }
+    /// `SpawnEggItem.use`: the SOURCE_ONLY ray must hit a liquid block.
+    pub(in crate::game) fn spawn_egg_fluid_hit(&self) -> Option<super::super::Hit> {
+        let hit = self.bucket_hit()?;
+        matches!(
+            &*self.block_name(hit.pos),
+            "minecraft:water" | "minecraft:lava"
+        )
+        .then_some(hit)
+    }
+    /// Shared peaceful-mode eligibility for spawn eggs.
+    pub(in crate::game) fn spawn_egg_allowed(&self, item: &str) -> bool {
+        let kind = item.trim_end_matches("_spawn_egg");
+        self.ui.difficulty != 0
+            || self
+                .res
+                .mob_types()
+                .get(kind)
+                .is_none_or(|t| horizon_client::mobs::spawn_rules::allowed_in_peaceful(t.species))
+    }
+    /// `SpawnEggItem.useOn` for a block, or `use` for a fluid source.
+    pub(super) fn use_spawn_egg(&mut self, stack: &ItemStack) -> Result<bool> {
+        let fluid = matches!(self.guest_use, Some(super::super::GuestUse::Item(_)));
+        let Some(hit) = (if fluid {
+            self.spawn_egg_fluid_hit()
+        } else {
+            self.pick()
+        }) else {
+            return Ok(false);
+        };
+        let kind = stack.item.trim_end_matches("_spawn_egg").to_owned();
+        if !self.spawn_egg_allowed(&stack.item) {
+            self.use_failed = true;
+            return Ok(true);
+        }
+        if fluid
+            && !self.may_build()
+            && !self.can_place_on_in_adventure([
+                hit.pos[0] - hit.face[0],
+                hit.pos[1] - hit.face[1],
+                hit.pos[2] - hit.face[2],
+            ])
+        {
+            self.use_failed = true;
+            return Ok(true);
+        }
+        // SpawnEggItem.useOn on a spawner sets its mob (and an op's egg data).
+        let (spawner_id, data) = horizon_client::block_entity_item::spawn_egg_on_spawner(
+            stack,
+            self.acting_player_is_op(),
+        );
+        if let Some(done) = self.use_spawn_egg_on_spawner(hit.pos, &spawner_id, data.as_ref()) {
+            if done {
+                self.swing_arm();
+                self.award_stat("used", &stack.item, 1);
+                self.consume_held();
+            }
+            return Ok(true);
+        }
+        // useOn: a clicked block without a collision shape (vines, grass)
+        // takes the mob itself, any other the one on the clicked face.
+        let p = if fluid || self.collision_empty(hit.pos) {
+            hit.pos
+        } else {
+            [
+                hit.pos[0] + hit.face[0],
+                hit.pos[1] + hit.face[1],
+                hit.pos[2] + hit.face[2],
+            ]
+        };
+        let at = [
+            f64::from(p[0]) + 0.5,
+            f64::from(p[1]),
+            f64::from(p[2]) + 0.5,
+        ];
+        // SpawnEggItem.spawnMob: `EntityType.spawn`.
+        let Some(id) = self.spawn_mob_spawned(&kind, at, SpawnYaw::Created) else {
+            return Ok(false);
+        };
+        // SpawnEggItem.spawnMob: `EntityType.create` finalizes the mob, then
+        // `PostSpawnProcessor` puts the egg's components on it.
+        if let Some(m) = self.mobs.iter_mut().find(|m| m.id == id) {
+            horizon_client::entity_nbt::apply_item_components(m, stack);
+        }
+        self.apply_spawn_egg_entity_data(id, stack);
+        self.post_block_game_event("minecraft:entity_place", p, Some(Who::Player), None);
+        self.award_stat("used", &stack.item, 1);
+        self.swing_arm();
+        if !self.creative
+            && let Some(s) = self.held_mut().as_mut()
+        {
+            s.count -= 1;
+            if s.count == 0 {
+                *self.held_mut() = None;
+            }
+        }
+        Ok(true)
+    }
+    /// `EntityType.updateCustomEntityTag`: the egg's `minecraft:entity_data` on
+    /// the mob it spawned, once the guards let it through, as
+    /// `TypedEntityData.loadInto`: the mob's own compound, the data merged over
+    /// it, loaded back into the same mob (`/data merge entity`'s loader).
+    pub(in crate::game) fn apply_spawn_egg_entity_data(&mut self, id: u32, stack: &ItemStack) {
+        let Some(i) = self.mobs.iter().position(|m| m.id == id) else {
+            return;
+        };
+        let kind = self.mobs[i].kind.id.clone();
+        let op = self.acting_player_is_op();
+        let Some(data) = horizon_client::block_entity_item::spawn_egg_entity_data(stack, &kind, op)
+        else {
+            return;
+        };
+        let own = self.mob_tree_nbt(i);
+        let tag = horizon_client::data_cmd::merged(&own, data);
+        // Nothing to report: the mob's own compound always loads back.
+        let _ = self.apply_entity_nbt(super::super::commands::Target::Mob(id), tag);
+    }
+}

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

@@ -471,15 +471,46 @@ impl Game<'_> {
                 continue;
             }
             self.cushions[i].check_interval = 0;
-            let c = self.cushions[i].clone();
-            if self.cushion_in_fire(&c) || !self.cushion_survives(&c) {
-                self.break_cushion(i, false);
-                continue;
+            if !self.check_cushion(i) {
+                i += 1;
             }
-            i += 1;
         }
     }
 
+    /// `Cushion.tickAtCheckInterval` plus the survive check; true when the cushion broke.
+    fn check_cushion(&mut self, i: usize) -> bool {
+        let c = self.cushions[i].clone();
+        let p = c.position;
+        let (x, y, z) = (p.x.floor() as i32, p.y.floor() as i32, p.z.floor() as i32);
+        // collidedWithFluid: the fluid box of the cushion's own block against its box.
+        if let Some((height, _)) =
+            self.fluid_height_of(x, y, z, Some(horizon_client::blocks::Fluid::Lava))
+        {
+            let fluid = Aabb::new(
+                Vec3::new(f64::from(x), f64::from(y), f64::from(z)),
+                Vec3::new(
+                    f64::from(x) + 1.0,
+                    f64::from(y) + f64::from(height),
+                    f64::from(z) + 1.0,
+                ),
+            );
+            if aabb(c.bounds())
+                .deflate(Vec3::new(1.0e-7, 1.0e-7, 1.0e-7))
+                .intersects(fluid)
+            {
+                // LAVA_IGNITE's lavaHurt deals 4 damage, which breaks the cushion.
+                self.break_cushion(i, false);
+                self.lava_hurt_sound([p.x, p.y, p.z]);
+                return true;
+            }
+        }
+        if self.cushion_in_fire(&c) || !self.cushion_survives(&c) {
+            self.break_cushion(i, false);
+            return true;
+        }
+        false
+    }
+
     /// `LivingEntity.stopRiding` off a cushion: `dismountVehicle` beside it,
     /// and `Cushion.removePassenger`'s get-up sound for a rider that left
     /// rather than one whose cushion was killed.

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

@@ -1,8 +1,8 @@
-//! OptiFine custom skies (`horizon_client::custom_sky`): each frame, the layers of the world's sky
-//! whose day, weather, biome and height hold at the camera, handed to the renderer, which draws
-//! them over the vanilla sky. A pack without `optifine/sky` hands it none.
+//! Custom skies (`horizon_client::custom_sky`, OptiFine's format): each frame, the layers of the
+//! world's sky whose day, weather, biome and height hold at the camera, handed to the renderer,
+//! which draws them over the vanilla sky. A pack without layers hands it none.
 use super::*;
-use horizon_optifine::sky::{Conditions, Now};
+use horizon_client::custom_sky::{Conditions, Weather};
 
 /// The layers' eased brightness between frames, and when the last frame was.
 #[derive(Default)]
@@ -46,11 +46,11 @@ impl Game<'_> {
             let mut state = std::mem::take(&mut self.custom_sky.state);
             // Level.isThundering / isRaining.
             let weather = if thunder > 0.9 && rain > 0.2 {
-                Now::Thunder
+                Weather::Thunder
             } else if rain > 0.2 {
-                Now::Rain
+                Weather::Rain
             } else {
-                Now::Clear
+                Weather::Clear
             };
             let conditions = Conditions {
                 day_time: self.view_day_time(),

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.set_pvp_legacy_rules(load_combat());
+        self.settings.extras.pvp.combat.rules = load_combat();
         // Horizon's far ring (docs/hosting.md): server.toml's `max_view_distance`.
         let far = props
             .raw
@@ -2671,7 +2671,7 @@ mod tests {
     #[test]
     fn a_temporarily_banned_player_is_refused_with_the_end_until_it_has_passed() {
         use super::{BanEntry, BanList, Lists, NameAndId};
-        use horizon_chat_filter::now_millis;
+        use horizon_server_files::duration::now_millis;
         let dir = std::env::temp_dir().join(format!("horizon-can-login-{}", std::process::id()));
         fs::create_dir_all(&dir).unwrap();
         let mut lists = Lists {

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

@@ -2,21 +2,15 @@
 //! (`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;
@@ -30,6 +24,8 @@ 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);
@@ -61,7 +57,6 @@ 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();
@@ -83,6 +78,74 @@ 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)> {
@@ -221,7 +284,7 @@ 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.effect_icons_hidden() {
+        if effects.is_empty() || self.screen != Screen::Playing || self.pvp_effects_shown() {
             return 0.0;
         }
         let harmful = effects.iter().any(|e| {

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

@@ -1,11 +0,0 @@
-//! 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

@@ -1,155 +0,0 @@
-//! 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.legacy_pose()
+        let legacy_block = self.settings.extras.pvp.combat.legacy
             && 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.shield_size();
+            let shield_size = self.settings.extras.pvp.tweaks.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.legacy_pose()
+            if self.settings.extras.pvp.combat.legacy
                 && !state.layers.is_empty()
                 && state
                     .layers

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

@@ -1,24 +1,35 @@
 //! Play with friends, host side: "Start Sharing" on the Play with Friends
-//! screen (`friends_screen`, the pause menu's Friends button) opens the world to LAN if
+//! screen (`screen`, the pause menu's Friends button) opens the world to LAN if
 //! it isn't (with Open to LAN's defaults) and shares that port behind an
 //! invite code (horizon-friends). The code holds this computer's addresses
 //! and the key, so friends join with no server of ours; a relay the player
 //! configured adds a short code and a fallback. The integrated server is the
 //! LAN one, unchanged: tunnelled guests are LAN guests that connect from the
-//! loopback address.
-use super::{Game, lan::LanSettings};
-use horizon_client::{
-    Result,
-    friends_screen::{self, Action, FriendsView},
-    hud::HudBatch,
-    lang,
-    text::Text,
-};
+//! loopback address. The joining side is horizon-friends' (`game`), registered by
+//! horizon-official.
+//!
+//! It sees the game only through `horizon_hooks::share` (the engine's `ShareView`) and
+//! `Hooks::lan_closed`, and keeps what it shares in its own static,
+//! so it can leave the engine for horizon-friends (spec #14167). The screen and the
+//! `horizon-ctl friends` command below still reach it from `Game` until then.
+use super::Game;
+use horizon_client::{Result, hud::HudBatch};
 use horizon_friends::{Host, HostConfig, HostEvent, PathMode, host::DEFAULT_PORT, reach, stun};
+use horizon_hooks::{
+    Hooks,
+    share::{LanOptions, ShareView},
+};
 use horizon_protocol::{GAME_VERSION, PROTOCOL_VERSION};
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{Mutex, MutexGuard, PoisonError};
 use std::time::{Duration, Instant};
 
-pub(super) struct Sharing {
+mod screen;
+
+use screen::{self as friends_screen, Action, FriendsView};
+pub use screen::{TITLE, title};
+
+struct Sharing {
     host: Host,
     /// Sharing opened the world to LAN, so stopping closes it again.
     opened_lan: bool,
@@ -31,12 +42,52 @@ pub(super) struct Sharing {
     paths: (u32, u32),
 }
 
+/// The world shared, if one is. The game has one window player who can share (the engine
+/// calls the hooks for it only), so one is all there is.
+static SHARING: Mutex<Option<Sharing>> = Mutex::new(None);
+/// Whether [`SHARING`] holds one: a tick with nothing shared is this one load.
+static ON: AtomicBool = AtomicBool::new(false);
+
+fn sharing() -> MutexGuard<'static, Option<Sharing>> {
+    SHARING.lock().unwrap_or_else(PoisonError::into_inner)
+}
+
+/// Ends the sharing, if there is one. The lock is let go before the caller touches the
+/// game: closing LAN calls [`Hooks::lan_closed`], which takes it again.
+fn take() -> Option<Sharing> {
+    let taken = sharing().take();
+    ON.store(false, Ordering::Relaxed);
+    taken
+}
+
+/// Registered by the engine's entry while this module is part of it.
+pub struct Friends;
+pub static HOOKS: Friends = Friends;
+
+/// No `Hooks::share` yet: the code and sessions are read while the screen is drawn or
+/// `horizon-ctl friends status` asks, as before. The screen's page uses it (#14167 step 2a).
+impl Hooks for Friends {
+    /// The LAN server is closing: the code goes with it.
+    fn lan_closed(&self) {
+        if ON.load(Ordering::Relaxed)
+            && let Some(mut sharing) = take()
+        {
+            sharing.host.stop();
+        }
+    }
+}
+
 pub const HELP: &[&str] = &[
     "friends host                   share the open world behind an invite code",
     "friends stop                   stop sharing",
     "friends status                 the code, how friends reach this host, the guests",
 ];
 
+/// A string in the player's language, or the English one.
+fn tr(world: &dyn ShareView, key: &str, english: &str) -> String {
+    world.tr(key).unwrap_or_else(|| english.to_owned())
+}
+
 /// `HORIZON_STUN_SERVERS`, else `friendsStun` in horizon.txt, else the defaults.
 fn stun_servers() -> Vec<String> {
     if std::env::var_os("HORIZON_STUN_SERVERS").is_some() {
@@ -53,101 +104,99 @@ fn env_flag(name: &str, default: bool) -> bool {
     std::env::var(name).map_or(default, |v| v != "0")
 }
 
-impl Game<'_> {
-    /// Start sharing the open world.
-    pub(super) fn friends_start(&mut self) -> Result<()> {
-        if self.friends.is_some() {
-            return Ok(());
-        }
-        // Single player on its server thread shares that server, as Open to
-        // LAN publishes it; another server can't be shared.
-        if self.title.is_some() || (self.remote.is_some() && self.integrated.is_none()) {
-            return Err("open a singleplayer world first".into());
-        }
-        let opened_lan = self.lan_port().is_none();
-        if opened_lan {
-            // ShareToLanScreen's defaults, as the world options screen offers them.
-            self.lan_open(LanSettings {
-                port: horizon_client::lan::available_port(),
-                guest_commands: false,
-                force_game_mode: true,
-            })?;
-        }
-        let port = self.lan_port().ok_or("the world isn't open to LAN")?;
-        let host = match Host::start(HostConfig {
-            lan: std::net::SocketAddr::from(([127, 0, 0, 1], port)),
-            protocol: PROTOCOL_VERSION,
-            game: GAME_VERSION.to_owned(),
-            relay: horizon_client::net::friends_relay_setting(),
-            path: PathMode::from_env(),
-            port: std::env::var("HORIZON_FRIENDS_PORT")
-                .ok()
-                .and_then(|p| p.parse().ok())
-                .unwrap_or(DEFAULT_PORT),
-            reach: reach::Options {
-                // HORIZON_FRIENDS_UPNP=0 leaves the router alone.
-                map_port: env_flag("HORIZON_FRIENDS_UPNP", true),
-                stun: stun_servers(),
-                // Both ends on one machine (tests).
-                loopback: env_flag("HORIZON_FRIENDS_LOOPBACK", false),
-            },
-        }) {
-            Ok(h) => h,
-            Err(e) => {
-                if opened_lan {
-                    self.lan_close(true);
-                }
-                return Err(e.into());
+/// Start sharing the open world.
+fn start(world: &mut dyn ShareView) -> std::result::Result<(), String> {
+    if ON.load(Ordering::Relaxed) {
+        return Ok(());
+    }
+    if !world.can_share() {
+        return Err("open a singleplayer world first".into());
+    }
+    let (port, opened_lan) = match world.lan_port() {
+        Some(port) => (port, false),
+        // ShareToLanScreen's defaults, as the world options screen offers them.
+        None => (world.open_lan(LanOptions::default())?, true),
+    };
+    let host = Host::start(HostConfig {
+        lan: std::net::SocketAddr::from(([127, 0, 0, 1], port)),
+        protocol: PROTOCOL_VERSION,
+        game: GAME_VERSION.to_owned(),
+        relay: horizon_client::net::friends_relay_setting(),
+        path: PathMode::from_env(),
+        port: std::env::var("HORIZON_FRIENDS_PORT")
+            .ok()
+            .and_then(|p| p.parse().ok())
+            .unwrap_or(DEFAULT_PORT),
+        reach: reach::Options {
+            // HORIZON_FRIENDS_UPNP=0 leaves the router alone.
+            map_port: env_flag("HORIZON_FRIENDS_UPNP", true),
+            stun: stun_servers(),
+            // Both ends on one machine (tests).
+            loopback: env_flag("HORIZON_FRIENDS_LOOPBACK", false),
+        },
+    });
+    let host = match host {
+        Ok(h) => h,
+        Err(e) => {
+            if opened_lan {
+                world.close_lan();
             }
-        };
-        self.friends = Some(Sharing {
-            host,
-            opened_lan,
-            code: None,
-            wrong: 0,
-            notice: None,
-            copied: None,
-            paths: (0, 0),
-        });
-        Ok(())
-    }
+            return Err(e.to_string());
+        }
+    };
+    *sharing() = Some(Sharing {
+        host,
+        opened_lan,
+        code: None,
+        wrong: 0,
+        notice: None,
+        copied: None,
+        paths: (0, 0),
+    });
+    ON.store(true, Ordering::Relaxed);
+    Ok(())
+}
 
-    /// Stop sharing: the code ends (direct port closed, router mapping
-    /// deleted); the world closes to LAN again if sharing opened it.
-    pub(super) fn friends_stop(&mut self) {
-        let Some(mut sharing) = self.friends.take() else {
+/// Stop sharing: the code ends (direct port closed, router mapping
+/// deleted); the world closes to LAN again if sharing opened it.
+fn stop(world: &mut dyn ShareView) {
+    if !world.can_share() {
+        return;
+    }
+    let Some(mut sharing) = take() else {
+        return;
+    };
+    sharing.host.stop();
+    if sharing.opened_lan {
+        world.close_lan();
+    } else {
+        let text = tr(
+            world,
+            "horizon.friends.stopped",
+            "Stopped sharing the invite code.",
+        );
+        world.chat(&text);
+    }
+}
+
+/// New codes and sessions, while the screen is drawn and when `friends status` asks.
+fn tick(world: &mut dyn ShareView) {
+    if !ON.load(Ordering::Relaxed) {
+        return;
+    }
+    let mut announce = false;
+    let mut stopped = None;
+    {
+        let mut guard = sharing();
+        let Some(sharing) = guard.as_mut() else {
             return;
         };
-        sharing.host.stop();
-        if sharing.opened_lan {
-            self.lan_close(true);
-        } else {
-            self.system_message(Text::literal(lang::get_or(
-                "horizon.friends.stopped",
-                "Stopped sharing the invite code.",
-            )));
-        }
-    }
-
-    /// The LAN server is closing: the code goes with it.
-    pub(super) fn friends_lan_closed(&mut self) {
-        if let Some(mut sharing) = self.friends.take() {
-            sharing.host.stop();
-        }
-    }
-
-    /// New codes and sessions, once a tick and while the pause menu is drawn.
-    pub(super) fn tick_friends(&mut self) {
-        let Some(sharing) = self.friends.as_mut() else {
-            return;
-        };
-        let mut announce = false;
-        let mut stopped = None;
         for event in sharing.host.poll() {
             match event {
                 HostEvent::Code(code) => {
                     if sharing.code.is_some() && sharing.wrong >= horizon_friends::host::MAX_WRONG {
-                        sharing.notice = Some(lang::get_or(
+                        sharing.notice = Some(tr(
+                            world,
                             "horizon.friends.short_code_changed",
                             "Someone kept trying a wrong short code, so it changed.",
                         ));
@@ -158,7 +207,8 @@ impl Game<'_> {
                 }
                 HostEvent::WrongCode { count } => {
                     sharing.wrong = count;
-                    sharing.notice = Some(lang::get_or(
+                    sharing.notice = Some(tr(
+                        world,
                         "horizon.friends.wrong_code",
                         "Someone tried a wrong code.",
                     ));
@@ -167,7 +217,8 @@ impl Game<'_> {
                 HostEvent::Connected { direct: false, .. } => sharing.paths.1 += 1,
                 HostEvent::Disconnected { .. } => {}
                 HostEvent::RelayStopped => {
-                    let text = lang::get_or(
+                    let text = tr(
+                        world,
                         "horizon.friends.relay_stopped",
                         "Too many wrong short codes, so the relay is off until you share again. Friends can still join with the full code.",
                     );
@@ -176,159 +227,272 @@ impl Game<'_> {
                 }
             }
         }
-        if let Some(text) = stopped {
-            self.system_message(Text::literal(text));
-        }
-        if announce {
-            self.system_message(Text::literal(lang::get_or(
-                "horizon.friends.code_ready",
-                "Your invite code is ready: Game Menu, Play with Friends. Copy it and send it to your friends.",
-            )));
-        }
     }
+    if let Some(text) = stopped {
+        world.chat(&text);
+    }
+    if announce {
+        let text = tr(
+            world,
+            "horizon.friends.code_ready",
+            "Your invite code is ready: Game Menu, Play with Friends. Copy it and send it to your friends.",
+        );
+        world.chat(&text);
+    }
+}
 
-    pub(super) fn friends_copy(&mut self) {
-        let Some(code) = self.friends.as_ref().and_then(|s| s.code.clone()) else {
-            return;
+fn copy(world: &mut dyn ShareView) {
+    if !world.can_share() {
+        return;
+    }
+    let Some(code) = sharing().as_ref().and_then(|s| s.code.clone()) else {
+        return;
+    };
+    world.copy(&code);
+    if let Some(s) = sharing().as_mut() {
+        s.copied = Some(Instant::now());
+    }
+}
+
+/// What Play with Friends shows.
+fn status(world: &dyn ShareView) -> FriendsView {
+    // Another server, or a splitscreen guest in P1's world: nothing to share.
+    if !world.can_share() {
+        return FriendsView::default();
+    }
+    let guard = sharing();
+    let Some(s) = guard.as_ref() else {
+        return FriendsView {
+            shown: true,
+            ..FriendsView::default()
         };
-        use horizon_client::clipboard::Clipboard;
-        self.clipboard.set(&code);
-        if let Some(s) = self.friends.as_mut() {
-            s.copied = Some(Instant::now());
-        }
+    };
+    let mut guests = Vec::new();
+    world.players(&mut |name| guests.push(name.to_owned()));
+    let state = s.host.state();
+    let mut status = if s.code.is_none() {
+        tr(
+            world,
+            "horizon.friends.finding_route",
+            "Finding how friends can reach you…",
+        )
+    } else {
+        state.summary.clone()
+    };
+    if let Some(short) = &state.short {
+        status.push_str(&format!(" Short code for the relay: {short}."));
     }
+    if let Some(problem) = &state.relay_problem {
+        status.push(' ');
+        status.push_str(problem);
+    }
+    let reachable = matches!(
+        state.verdict,
+        Some(reach::Verdict::Mapped(_) | reach::Verdict::Public)
+    ) || state.short.is_some();
+    FriendsView {
+        shown: true,
+        sharing: true,
+        code: s.code.clone(),
+        status,
+        reachable,
+        help: (!reachable && s.code.is_some()).then(|| reach::HELP_URL.to_owned()),
+        guests,
+        notice: s.notice.clone(),
+        copied: s
+            .copied
+            .is_some_and(|t| t.elapsed() < Duration::from_secs(2)),
+    }
+}
 
+/// `horizon-ctl friends host|stop|status`.
+fn control(
+    word: Option<&str>,
+    world: &mut dyn ShareView,
+) -> std::result::Result<serde_json::Value, String> {
+    use serde_json::json;
+    match word {
+        Some("host") => {
+            start(world)?;
+            Ok(json!({ "ok": true, "lan_port": world.lan_port() }))
+        }
+        Some("stop") => {
+            stop(world);
+            Ok(json!({ "ok": true }))
+        }
+        Some("status") => {
+            tick(world);
+            let view = status(world);
+            let guard = sharing();
+            let sharing = guard.as_ref().filter(|_| view.sharing);
+            let state = sharing.map(|s| s.host.state());
+            Ok(json!({
+                "sharing": view.sharing,
+                "code": view.code,
+                "short": state.as_ref().and_then(|s| s.short.as_ref().map(ToString::to_string)),
+                "summary": view.status,
+                "reachable": view.reachable,
+                "verdict": state.as_ref().and_then(|s| s.verdict.as_ref().map(|v| format!("{v:?}"))),
+                "direct_port": state.as_ref().map(|s| s.port),
+                "sessions": sharing.map_or(0, |s| s.host.sessions()),
+                "direct": sharing.map_or(0, |s| s.paths.0),
+                "relayed": sharing.map_or(0, |s| s.paths.1),
+                "guests": view.guests,
+                "lan_port": world.lan_port(),
+            }))
+        }
+        _ => Err("friends host|stop|status".into()),
+    }
+}
+
+impl Game<'_> {
     /// Play with Friends. The world is paused under it in singleplayer, so
     /// new codes and sessions are read while it is drawn.
     pub(super) fn draw_friends_screen(&mut self, batch: &mut HudBatch) {
-        self.tick_friends();
-        let view = self.friends_view();
+        let world = &mut self.share_view();
+        tick(world);
+        let view = status(world);
         horizon_client::widgets::begin_screen(|| {
             horizon_client::widgets::ScreenInfo::new("friends", friends_screen::TITLE)
         });
         friends_screen::draw(batch, &self.gui.atlas, self.cursor, &view, true);
     }
+
     pub(super) fn friends_screen_click(&mut self) {
-        let view = self.friends_view();
+        let view = status(&self.share_view());
         let Some(action) =
             friends_screen::click(&self.gui.atlas, self.gui_size(), self.cursor, &view)
         else {
             return;
         };
         self.audio.play_button_click();
+        if action == Action::Done {
+            self.screen = super::Screen::Paused;
+            return;
+        }
+        let world = &mut self.share_view();
         match action {
             Action::Share => {
-                if let Err(e) = self.friends_start() {
-                    self.system_message(Text::literal(
-                        lang::get_or(
-                            "horizon.friends.share_failed",
-                            "Couldn't share the world: %s",
-                        )
-                        .replacen("%s", &e.to_string(), 1),
-                    ));
+                if let Err(e) = start(world) {
+                    let text = tr(
+                        world,
+                        "horizon.friends.share_failed",
+                        "Couldn't share the world: %s",
+                    )
+                    .replacen("%s", &e, 1);
+                    world.chat(&text);
                 }
             }
-            Action::Copy => self.friends_copy(),
-            Action::Stop => self.friends_stop(),
-            // The system browser, as the folder buttons open their folders.
+            Action::Copy => copy(world),
+            Action::Stop => stop(world),
             Action::Help => {
                 if let Some(url) = &view.help {
-                    super::packs::open_uri(url);
+                    world.open_url(url);
                 }
             }
-            Action::Done => self.screen = super::Screen::Paused,
+            Action::Done => {}
         }
     }
 
-    /// What Play with Friends shows.
-    pub(super) fn friends_view(&self) -> FriendsView {
-        let guests = match &self.lan {
-            Some(h) => h.hub.guests.iter().map(|g| g.name.clone()).collect(),
-            // On the server thread: the other players the server lists.
-            None if self.integrated.is_some() => {
-                let me = self.options.player_name();
-                let mut names = self.remote_online_names().unwrap_or_default();
-                names.retain(|n| *n != me);
-                names
-            }
-            None => Vec::new(),
-        };
-        let Some(s) = &self.friends else {
-            return FriendsView {
-                shown: self.remote.is_none() || self.integrated.is_some(),
-                ..FriendsView::default()
-            };
-        };
-        let state = s.host.state();
-        let mut status = if s.code.is_none() {
-            lang::get_or(
-                "horizon.friends.finding_route",
-                "Finding how friends can reach you…",
-            )
-        } else {
-            state.summary.clone()
-        };
-        if let Some(short) = &state.short {
-            status.push_str(&format!(" Short code for the relay: {short}."));
-        }
-        if let Some(problem) = &state.relay_problem {
-            status.push(' ');
-            status.push_str(problem);
-        }
-        let reachable = matches!(
-            state.verdict,
-            Some(reach::Verdict::Mapped(_) | reach::Verdict::Public)
-        ) || state.short.is_some();
-        FriendsView {
-            shown: true,
-            sharing: true,
-            code: s.code.clone(),
-            status,
-            reachable,
-            help: (!reachable && s.code.is_some()).then(|| reach::HELP_URL.to_owned()),
-            guests,
-            notice: s.notice.clone(),
-            copied: s
-                .copied
-                .is_some_and(|t| t.elapsed() < Duration::from_secs(2)),
-        }
+    /// Whether the pause menu offers Play with Friends (a singleplayer world).
+    pub(super) fn friends_shown(&self) -> bool {
+        self.can_share()
     }
 
     /// `horizon-ctl friends ...`.
     pub(super) fn friends_control(&mut self, words: &[&str]) -> Result<Option<serde_json::Value>> {
-        use serde_json::json;
         if words[0] != "friends" {
             return Ok(None);
         }
-        match words.get(1).copied() {
-            Some("host") => {
-                self.friends_start()?;
-                Ok(Some(json!({ "ok": true, "lan_port": self.lan_port() })))
+        Ok(Some(control(
+            words.get(1).copied(),
+            &mut self.share_view(),
+        )?))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// A world as the engine shows it, recording what the crate did to it.
+    #[derive(Default)]
+    struct Fake {
+        can_share: bool,
+        lan: Option<u16>,
+        refuse_lan: bool,
+        did: Vec<String>,
+    }
+
+    impl ShareView for Fake {
+        fn can_share(&self) -> bool {
+            self.can_share
+        }
+        fn lan_port(&self) -> Option<u16> {
+            self.lan
+        }
+        fn open_lan(&mut self, options: LanOptions) -> std::result::Result<u16, String> {
+            self.did.push(format!("open_lan {options:?}"));
+            if self.refuse_lan {
+                return Err("no free port".into());
             }
-            Some("stop") => {
-                self.friends_stop();
-                Ok(Some(json!({ "ok": true })))
-            }
-            Some("status") => {
-                self.tick_friends();
-                let view = self.friends_view();
-                let state = self.friends.as_ref().map(|s| s.host.state());
-                Ok(Some(json!({
-                    "sharing": view.sharing,
-                    "code": view.code,
-                    "short": state.as_ref().and_then(|s| s.short.as_ref().map(ToString::to_string)),
-                    "summary": view.status,
-                    "reachable": view.reachable,
-                    "verdict": state.as_ref().and_then(|s| s.verdict.as_ref().map(|v| format!("{v:?}"))),
-                    "direct_port": state.as_ref().map(|s| s.port),
-                    "sessions": self.friends.as_ref().map_or(0, |s| s.host.sessions()),
-                    "direct": self.friends.as_ref().map_or(0, |s| s.paths.0),
-                    "relayed": self.friends.as_ref().map_or(0, |s| s.paths.1),
-                    "guests": view.guests,
-                    "lan_port": self.lan_port(),
-                })))
-            }
-            _ => Err("friends host|stop|status".into()),
+            self.lan = Some(25565);
+            Ok(25565)
+        }
+        fn close_lan(&mut self) {
+            self.did.push("close_lan".into());
+            self.lan = None;
+        }
+        fn players(&self, each: &mut dyn FnMut(&str)) {
+            each("Alex");
+        }
+        fn chat(&mut self, text: &str) {
+            self.did.push(format!("chat {text}"));
+        }
+        fn copy(&mut self, text: &str) {
+            self.did.push(format!("copy {text}"));
+        }
+        fn open_url(&mut self, url: &str) {
+            self.did.push(format!("open_url {url}"));
+        }
+        fn tr(&self, _key: &str) -> Option<String> {
+            None
         }
+    }
+
+    #[test]
+    fn a_world_that_cannot_be_shared_is_left_alone() {
+        // Another server, or a splitscreen guest in P1's world.
+        let mut guest = Fake {
+            lan: Some(25565),
+            ..Fake::default()
+        };
+        assert_eq!(
+            control(Some("host"), &mut guest).unwrap_err(),
+            "open a singleplayer world first"
+        );
+        stop(&mut guest);
+        copy(&mut guest);
+        assert!(guest.did.is_empty(), "{:?}", guest.did);
+        assert!(!status(&guest).shown);
+        assert!(!ON.load(Ordering::Relaxed));
+    }
+
+    #[test]
+    fn sharing_opens_lan_as_open_to_lan_does_and_a_refusal_shares_nothing() {
+        let mut world = Fake {
+            can_share: true,
+            refuse_lan: true,
+            ..Fake::default()
+        };
+        assert_eq!(start(&mut world).unwrap_err(), "no free port");
+        assert_eq!(
+            world.did,
+            ["open_lan LanOptions { guest_commands: false, force_game_mode: true }"]
+        );
+        // Offered, not shared: the guests show once sharing does.
+        let view = status(&world);
+        assert!(view.shown && !view.sharing && view.guests.is_empty());
+        assert!(!ON.load(Ordering::Relaxed));
     }
 }

crates/horizon-client/src/game/friends/screen.rs

@@ -1,9 +1,9 @@
 //! Play with Friends: Horizon's own sharing of the open world behind an
-//! invite code (`game/friends.rs`). The pause menu's Friends button, the icon
+//! invite code (`game/friends.rs`), with the rest of Play with Friends' game glue. The pause menu's Friends button, the icon
 //! vanilla's PauseScreen already has, opens it. It is drawn the way a mod adds
 //! a screen to vanilla: the menu background, a centred title and text,
 //! vanilla's buttons and Done in the footer.
-use crate::{
+use horizon_client::{
     hud::{HudAtlas, HudBatch, rgba},
     multiplayer::wrap,
     text::Text,
@@ -14,7 +14,7 @@ use crate::{
 pub const TITLE: &str = "Play with Friends";
 /// A string of this screen: the language table's, or the English text.
 fn tr(key: &str, english: &str) -> String {
-    crate::lang::get_or(key, english)
+    horizon_client::lang::get_or(key, english)
 }
 /// The title in the current language.
 pub fn title() -> String {
@@ -245,8 +245,8 @@ pub fn draw(
     for b in buttons {
         let hover = b.active && ui::hovered(cursor, b.x, b.y, b.w, 20.0);
         if matches!(b.action, Action::Done) {
-            crate::widgets::declare_action(
-                crate::widgets::Action::Done,
+            horizon_client::widgets::declare_action(
+                horizon_client::widgets::Action::Done,
                 [b.x, b.y, b.w, 20.0],
                 b.active,
             );

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

@@ -1,16 +1,18 @@
 //! Play with Friends left out of the build (the `friends` feature off, as in the server build):
-//! no world is shared, the pause menu has no Friends button (`FriendsView::shown` is false, as on
+//! no world is shared, the pause menu has no Friends button (`friends_shown` is false, as on
 //! another server) and `horizon-ctl friends` says it isn't there. game/friends.rs is the real one.
 use super::{Game, Screen};
-use horizon_client::{Result, friends_screen::FriendsView, hud::HudBatch};
+use horizon_client::{Result, hud::HudBatch};
 
 pub const HELP: &[&str] = &[];
 
+/// The pause menu's Friends icon is vanilla's, drawn inactive: its name for the widget tree.
+pub const TITLE: &str = "Play with Friends";
+pub fn title() -> String {
+    horizon_client::lang::get_or("horizon.friends.title", TITLE)
+}
+
 impl Game<'_> {
-    pub(super) fn friends_lan_closed(&mut self) {}
-
-    pub(super) fn tick_friends(&mut self) {}
-
     /// Only reached by naming the screen (`horizon-ctl`): back to the pause menu.
     pub(super) fn draw_friends_screen(&mut self, _batch: &mut HudBatch) {
         self.screen = Screen::Paused;
@@ -18,8 +20,8 @@ impl Game<'_> {
 
     pub(super) fn friends_screen_click(&mut self) {}
 
-    pub(super) fn friends_view(&self) -> FriendsView {
-        FriendsView::default()
+    pub(super) fn friends_shown(&self) -> bool {
+        false
     }
 
     /// `horizon-ctl friends ...`.

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.legacy_pose(),
+            self.settings.extras.pvp.combat.legacy,
         );
         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(self.pvp_legacy_rules(), Ordering::Relaxed);
+            .store(settings.extras.pvp.combat.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.set_pvp_legacy_rules(flags.legacy_rules.load(Ordering::Relaxed));
+        self.settings.extras.pvp.combat.rules = flags.legacy_rules.load(Ordering::Relaxed);
         let Some(host) = self.lan.as_mut() else {
             return;
         };

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

@@ -2,9 +2,6 @@
 //! 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 {
@@ -164,7 +161,7 @@ impl Game<'_> {
             }
             return;
         }
-        if self.tweak_press(slot, right, shift) || self.container_press(right) {
+        if self.tweak_press(slot, right, shift) {
             return;
         }
         if let Some(slot) = slot
@@ -266,9 +263,7 @@ 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)
-            || self.container_drag()
-        {
+        if self.tweaks_on() && self.tweak_drag_move(self.inventory_target().0) {
             return;
         }
         let Some((ty, slots)) = self.inv_drag.clone() else {
@@ -431,7 +426,6 @@ 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

@@ -1,303 +0,0 @@
-//! 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.rs

@@ -1489,7 +1489,7 @@ impl Game<'_> {
                 None => self.unpublish(),
             };
             if closed {
-                self.friends_lan_closed();
+                self.lan_closed_hooks();
             }
             if closed && announce && self.integrated.is_some() {
                 self.system_message(Text::translate(
@@ -1499,7 +1499,7 @@ impl Game<'_> {
             }
             return;
         }
-        self.friends_lan_closed();
+        self.lan_closed_hooks();
         self.native_players_leaving();
         let Some(mut host) = self.lan.take() else {
             return;

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.particle_hidden(options.ty) {
+        if self.settings.extras.pvp.combat.hides_particle(options.ty) {
             return;
         }
         let (d, s) = (p.dist.map(f64::from), p.max_speed.map(f64::from));

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

@@ -152,6 +152,14 @@ impl WorldOptions {
         }
         self.port.value.parse::<u16>().ok().filter(|p| *p >= 1024)
     }
+
+    /// `portEdit.setTooltip(PORT_INFO_TEXT)`: the port box explains itself while
+    /// the cursor is over it. The box is drawn even with LAN off, so the tooltip
+    /// shows there too; a remote world has no such box.
+    fn port_tooltip(port: &EditBox, cursor: (f32, f32), remote: bool) -> Option<Text> {
+        (!remote && ui::hovered(cursor, port.x, port.y, port.width, port.height))
+            .then(|| Text::translate("lanServer.port", &[]))
+    }
     fn snapshot(&self) -> Snapshot {
         Snapshot {
             default_mode: self.default_mode,
@@ -1003,6 +1011,10 @@ impl Game<'_> {
                 hover,
             );
         }
+        // The widgets are drawn; the port box's tooltip goes over them.
+        if let Some(tip) = WorldOptions::port_tooltip(&o.port, cursor, o.remote) {
+            ui::tooltip(batch, atlas, &[tip], cursor);
+        }
     }
 
     /// The mouse wheel over the screen (ScrollableLayout, 10 pixels a step).
@@ -1899,4 +1911,15 @@ mod tests {
         assert!(o.locked);
         assert!(!o.active(Button::Difficulty));
     }
+
+    /// `portEdit.setTooltip(PORT_INFO_TEXT)`: hovering the port box shows its
+    /// label; a remote world (`o.remote`) has no port box to hover.
+    #[test]
+    fn the_port_box_explains_itself_on_hover() {
+        let port = EditBox::new(158.0, 100.0, 40.0, 20.0);
+        assert!(WorldOptions::port_tooltip(&port, (159.0, 101.0), false).is_some());
+        assert!(WorldOptions::port_tooltip(&port, (157.0, 101.0), false).is_none());
+        assert!(WorldOptions::port_tooltip(&port, (159.0, 121.0), false).is_none());
+        assert!(WorldOptions::port_tooltip(&port, (159.0, 101.0), true).is_none());
+    }
 }

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.pvp_legacy_rules()
+        self.remote.is_none() && self.settings.extras.pvp.combat.rules
     }
 
     /// `melee_damage` under legacy rules: (damage, attack strength, critical, enchanted).

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

@@ -91,7 +91,7 @@ pub(super) fn build_renderer(
         .prepare_glint_atlas(renderer.device.limits().max_texture_dimension_2d, filtering)?;
     renderer.set_lines_shader(atlas.lines_shader.as_deref());
     renderer.set_sky_shaders(atlas.sky_shader.as_deref(), atlas.stars_shader.as_deref());
-    renderer.set_custom_sky(&pack.custom_sky);
+    renderer.set_custom_sky(&*pack.custom_sky);
     renderer.set_shared_material_maps(&atlas.material_maps);
     let cit_glints = pack.item_renderer.cit.as_ref().map(|c| &c.glint_textures);
     renderer
@@ -200,7 +200,7 @@ pub(super) fn loading_frame(hud: &HudBatch) -> Frame<'_> {
         outline: Vec::new(),
         outline_after_terrain: false,
         outline_high_contrast: false,
-        look: Default::default(),
+        pvp: Default::default(),
         debug_lines: &[],
         debug_lines_on_top: &[],
         debug_crosshair: &[],

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

@@ -1,91 +0,0 @@
-//! 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/mob_looting.rs

@@ -157,7 +157,7 @@ impl Game<'_> {
     /// The numbers `Mob.compareArmor` and `compareWeapons` read off `stack`
     /// in `slot` for the mob `m`.
     pub(super) fn stack_facts(&self, m: &Mob, stack: &ItemStack, slot: Slot) -> Facts {
-        let (armor, toughness, attack) = self.attributes(m, &stack.item, slot);
+        let (armor, toughness, attack) = self.attributes(m, stack, slot);
         Facts {
             armor,
             armor_toughness: toughness,
@@ -173,22 +173,18 @@ impl Game<'_> {
 
     /// `Mob.getApproximateAttributeWith` for the item `id` in `slot`: each
     /// attribute starts from the mob's own value. (armour, toughness, damage)
-    fn attributes(&self, m: &Mob, id: &str, slot: Slot) -> (f64, f64, f64) {
-        let empty: &[(String, String, f64, String, String)] = &[];
-        let modifiers = self
-            .items()
-            .get(id)
-            .map_or(empty, |i| i.modifiers.as_slice());
+    fn attributes(&self, m: &Mob, stack: &ItemStack, slot: Slot) -> (f64, f64, f64) {
+        let modifiers = self.items().attribute_modifiers(stack);
         (
-            equip::attribute_with(modifiers, "minecraft:armor", f64::from(m.kind.armor), slot),
+            equip::attribute_with(&modifiers, "minecraft:armor", f64::from(m.kind.armor), slot),
             equip::attribute_with(
-                modifiers,
+                &modifiers,
                 "minecraft:armor_toughness",
                 f64::from(m.kind.armor_toughness),
                 slot,
             ),
             equip::attribute_with(
-                modifiers,
+                &modifiers,
                 "minecraft:attack_damage",
                 f64::from(m.attrs.attack_damage),
                 slot,

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

@@ -25,6 +25,7 @@ impl Game<'_> {
             facts: self.res.facts(),
             collision: self.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         self.particles.tick(&level);
     }

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

@@ -10,11 +10,7 @@ use horizon_client::{
     net::FRIEND,
 };
 use horizon_core::geometry::Vec3;
-#[cfg(feature = "friends")]
-use horizon_friends::invite::{self, Parsed};
 use std::borrow::Cow;
-#[cfg(feature = "friends")]
-use std::net::SocketAddr;
 use winit::keyboard::KeyCode;
 
 /// HUD and first-person hand visibility. Other hand-render restrictions still apply.
@@ -109,28 +105,11 @@ impl NativeWorldId {
     }
 }
 
-/// The part of a friend's invite anyone may see. A host's code is fresh each
-/// time it shares, so a friend's world is known for that sharing only. The
-/// relay is kept beside the addresses: two hosts on other networks can share
-/// a private address and the fixed direct port.
-#[cfg(feature = "friends")]
-fn invite_public_part(code: &str) -> String {
-    match invite::parse(code) {
-        Some(Parsed::Short(code)) => code.nameplate,
-        Some(Parsed::Long(invite)) => {
-            let relay = invite
-                .relay
-                .map(|r| format!("{}/{}", r.address, r.code.nameplate));
-            let endpoints = invite.endpoints.iter().map(SocketAddr::to_string);
-            endpoints.chain(relay).collect::<Vec<_>>().join(",")
-        }
-        None => String::new(),
-    }
-}
+/// The part of a friend's invite anyone may see (`horizon_hooks::tunnel::Resolver::public_part`).
+/// A host's code is fresh each time it shares, so a friend's world is known for that sharing only.
 /// Without Play with Friends no invite is read: a `friend:` world shows no part of it.
-#[cfg(not(feature = "friends"))]
-fn invite_public_part(_code: &str) -> String {
-    String::new()
+fn invite_public_part(code: &str) -> String {
+    horizon_hooks::engine::tunnel().map_or_else(String::new, |r| r.public_part(code))
 }
 
 /// A living entity known to the client, before interpolation. No authoritative writes.
@@ -558,8 +537,6 @@ impl Game<'_> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    #[cfg(feature = "friends")]
-    use horizon_friends::code::Code;
 
     #[test]
     fn a_world_is_its_save_in_single_player_and_its_address_on_a_server() {
@@ -573,52 +550,6 @@ mod tests {
         );
     }
 
-    #[test]
-    #[cfg(feature = "friends")]
-    fn friends_worlds_are_told_apart_by_their_hosts_never_by_their_secrets() {
-        const PORT: u16 = 50000;
-        const RELAY: &str = "relay.example.com:443";
-        // A short code: its nameplate, then its secret.
-        let short = |nameplate: &str, secret: &str| Code {
-            nameplate: nameplate.into(),
-            secret: secret.into(),
-        };
-        let invite = |secret: u8, host: &str, relay: Option<Code>| {
-            let code = invite::Invite {
-                secret: [secret; invite::SECRET],
-                port: PORT,
-                endpoints: vec![format!("{host}:{PORT}").parse().unwrap()],
-                relay: relay.map(|code| invite::RelayRef {
-                    address: RELAY.into(),
-                    code,
-                }),
-            }
-            .encode();
-            NativeWorldId::of(None, &format!("{FRIEND}{code}"))
-        };
-        assert_ne!(
-            invite(1, "192.168.1.5", None),
-            invite(1, "192.168.1.6", None),
-            "two friends"
-        );
-        assert_ne!(
-            invite(1, "192.168.1.5", Some(short("ABCD", "WXYZ"))),
-            invite(1, "192.168.1.5", Some(short("EFGH", "WXYZ"))),
-            "two friends on other networks behind the same private address"
-        );
-        assert_eq!(
-            invite(1, "192.168.1.5", Some(short("ABCD", "WXYZ"))),
-            invite(2, "192.168.1.5", Some(short("ABCD", "QRST"))),
-            "the invite's and the relay code's secrets take no part"
-        );
-        let typed = |code: Code| NativeWorldId::of(None, &format!("{FRIEND}{code}"));
-        assert_eq!(typed(short("ABCD", "WXYZ")), typed(short("ABCD", "QRST")));
-        assert_eq!(
-            typed(short("ABCD", "WXYZ")),
-            NativeWorldId::Server(format!("{FRIEND}ABCD"))
-        );
-    }
-
     #[test]
     fn a_hud_tells_chat_and_death_from_other_screens() {
         assert_eq!(

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

@@ -102,8 +102,16 @@ impl Game<'_> {
             if food && m.health < m.attrs.max_health {
                 // feed(player, hand, stack, 2, 1).
                 let sound = nautilus::eat_sound(m);
+                // TamableAnimal.feed: heals 2 x the food's nutrition, 1 for an
+                // item with no food component.
+                let nutrition = self
+                    .res
+                    .items()
+                    .get(item)
+                    .and_then(|i| i.food.as_ref())
+                    .map(|f| f.0 as i32);
                 let m = &mut self.mobs[index];
-                m.heal(2.0);
+                m.heal(nautilus::feed_heal(nutrition));
                 self.use_nautilus_food(item);
                 self.nautilus_sound(index, sound);
                 return true;

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.last_server.lan()
+        self.server_is_lan()
             || self
                 .remote
                 .as_ref()

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

@@ -226,6 +226,25 @@ impl Game<'_> {
         });
     }
 
+    /// `Entity.collide`'s `getEntityCollisions` for a body a piston or a
+    /// shulker lid pushes: the entities it can collide with
+    /// (`canCollideWith`, which for every mover but a vehicle is
+    /// `canBeCollidedWith`): a boat, a living shulker, a happy ghast held
+    /// still. A pushed boat or minecart collides by `canVehicleCollide`
+    /// instead, which this doesn't cover, and the player moves itself.
+    fn pushed_entity_colliders(&self, target: Target) -> Vec<Aabb> {
+        match target {
+            Target::Entity(EntityHandle::Boat(_) | EntityHandle::Cart(_)) => Vec::new(),
+            Target::Entity(handle) => {
+                let own = with_entity!(self, handle, entity => Entity::bounds(entity));
+                let mut boxes = self.item_entity_collisions();
+                boxes.retain(|b| *b != own);
+                boxes
+            }
+            _ => Vec::new(),
+        }
+    }
+
     /// The collision view of the moving piston at `pos` takes the progress
     /// its tick gave it. One no longer moving keeps its entry until
     /// `sync_moving_pistons`.
@@ -284,6 +303,7 @@ impl Game<'_> {
                 self.shulker_push_player(movement);
                 return;
             }
+            let entities = self.pushed_entity_colliders(target);
             let Ok(moved) = pushed_movement(
                 SceneCollisions {
                     world: &self.world,
@@ -298,6 +318,7 @@ impl Game<'_> {
                 body.step_height,
                 body.on_ground,
                 None,
+                &entities,
             ) else {
                 return;
             };
@@ -665,6 +686,7 @@ impl Game<'_> {
                 self.projectile_piston_block_effects(i, at);
             }
             self.piston_block_triggers(before, before);
+            self.release_after_block_move(target);
             return;
         }
         // `Entity.move`: a projectile a cobweb or powder snow holds stops dead
@@ -695,6 +717,7 @@ impl Game<'_> {
             }
             _ => None,
         };
+        let entities = self.pushed_entity_colliders(target);
         let resolved = with_piston_noclip(piston_direction, || {
             pushed_movement(
                 SceneCollisions {
@@ -709,6 +732,7 @@ impl Game<'_> {
                 step_height,
                 on_ground,
                 tnt.as_ref().map(|t| t.3),
+                &entities,
             )
             .unwrap_or(Vec3::ZERO)
         });
@@ -747,6 +771,9 @@ impl Game<'_> {
             || limited.length_squared() - resolved.length_squared() < 1.0e-7;
         if moved {
             self.apply_push(target, resolved);
+        } else {
+            // A move the collisions cut to nothing still ends in the check.
+            self.release_after_block_move(target);
         }
         if let Some((i, from, ..)) = tnt {
             self.finish_tnt_piston_move(i, from, resolved);
@@ -864,26 +891,37 @@ impl Game<'_> {
             }
             Target::Entity(handle) => {
                 with_entity_mut!(self, handle, entity => entity.move_by_piston(movement));
-                let Some(bounds) =
-                    with_entity!(self, handle, entity => entity.piston_release_bounds())
-                else {
-                    return;
-                };
-                let no_block_collision = {
-                    let mut scene = SceneCollisions {
-                        world: &self.world,
-                        binding: self.collision,
-                        subject: None,
-                    };
-                    no_collision_empty(&mut scene, bounds)
-                };
-                with_entity_mut!(self, handle, entity => {
-                    entity.release_after_piston(no_block_collision)
-                });
+                self.release_after_block_move(target);
             }
         }
     }
 
+    /// `AbstractArrow.move` with a mover other than the arrow itself (a
+    /// piston, a shulker lid): after `Entity.move`, whether or not it went
+    /// anywhere, a stuck arrow or trident with nothing to collide with within
+    /// 0.06 starts falling (`shouldFall`, `startFalling`). Its own tick only
+    /// checks once the block at its position changes, a tick later.
+    fn release_after_block_move(&mut self, target: Target) {
+        let Target::Entity(handle) = target else {
+            return;
+        };
+        let Some(bounds) = with_entity!(self, handle, entity => entity.piston_release_bounds())
+        else {
+            return;
+        };
+        let no_block_collision = {
+            let mut scene = SceneCollisions {
+                world: &self.world,
+                binding: self.collision,
+                subject: None,
+            };
+            no_collision_empty(&mut scene, bounds)
+        };
+        with_entity_mut!(self, handle, entity => {
+            entity.release_after_piston(no_block_collision)
+        });
+    }
+
     /// `causeBounce`: a slime block sets the velocity along the movement axis.
     fn bounce(&mut self, target: Target, movement: Direction) {
         match target {
@@ -939,19 +977,16 @@ fn pushed_movement<W>(
     step_height: f32,
     on_ground: bool,
     context: Option<CollisionContext<'_>>,
+    entities: &[Aabb],
 ) -> horizon_client::Result<Vec3>
 where
     W: BlockCollisionWorld<Error = std::io::Error> + EntityMovementWorld<Error = std::io::Error>,
 {
     // Without the entity's own context, the one `resolve` reads at its feet.
     let context = context.unwrap_or_else(|| CollisionContext::position(before.min_position().y));
-    EntityCollisions::with_border(blocks, border, at).resolve_with_context(
-        before,
-        movement,
-        step_height,
-        on_ground,
-        context,
-    )
+    let mut collisions = EntityCollisions::with_border(blocks, border, at);
+    collisions.entities = entities;
+    collisions.resolve_with_context(before, movement, step_height, on_ground, context)
 }
 
 #[cfg(test)]
@@ -980,6 +1015,7 @@ mod tests {
             0.0,
             false,
             None,
+            &[],
         )
         .expect("the push resolves");
         // The wall stops the body 0.4 blocks short of the whole push.
@@ -1003,6 +1039,7 @@ mod tests {
             0.0,
             false,
             None,
+            &[],
         )
         .expect("the push resolves");
         assert!(
@@ -1521,6 +1558,48 @@ mod h255_mob_piston_ground_tests {
             &mut std::collections::HashMap::new(),
         );
     }
+    /// `AbstractArrow.move` after a push the collisions cut to nothing: a stuck
+    /// arrow with nothing within 0.06 of it starts falling all the same.
+    #[test]
+    #[ignore = "needs prepared resources in HORIZON_TEST_RESOURCES"]
+    fn a_stuck_arrow_whose_push_a_wall_stops_falls_when_nothing_holds_it() {
+        with_game(|game| {
+            assert!(game.run_command("setblock 6 202 4 minecraft:stone"));
+            game.creatures.projectiles.clear();
+            assert!(game.run_command("summon minecraft:arrow 5.75 202.5 4.5 {NoGravity:0b}"));
+            let i = game
+                .creatures
+                .projectiles
+                .iter()
+                .position(|p| p.arrow.is_some())
+                .expect("the arrow");
+            {
+                let p = &mut game.creatures.projectiles[i];
+                p.velocity = Vec3::ZERO;
+                p.stuck = true;
+                p.arrow.as_mut().unwrap().in_ground = true;
+            }
+            let p = &game.creatures.projectiles[i];
+            let (bounds, at) = (p.bounds(), [p.position.x, p.position.z]);
+            let before = p.position;
+            game.move_pushed(
+                Target::Entity(EntityHandle::Projectile(i)),
+                bounds,
+                at,
+                0.0,
+                false,
+                Vec3::new(0.3, 0.0, 0.0),
+                Direction::East,
+                &mut std::collections::HashMap::new(),
+            );
+            let p = &game.creatures.projectiles[i];
+            assert_eq!(p.position, before, "the stone stops the push");
+            assert!(
+                !p.arrow.as_ref().unwrap().in_ground,
+                "nothing holds it, so it falls"
+            );
+        });
+    }
     #[test]
     #[ignore = "needs prepared resources in HORIZON_TEST_RESOURCES"]
     fn h255_added_no_request_and_exhausted_budget_keep_state() {

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

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

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

@@ -143,6 +143,7 @@ impl Game<'_> {
             facts: self.res.facts(),
             collision: self.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         find_noxious_gas_source_block(&level, [pos.0, pos.1, pos.2])
     }
@@ -198,6 +199,7 @@ impl Game<'_> {
             facts: self.res.facts(),
             collision: self.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         // The gas reads blocks only, so the mobs it reaches can be found
         // before any gets its effect.
@@ -264,6 +266,7 @@ impl Game<'_> {
                 facts: self.res.facts(),
                 collision: self.collision,
                 player: None,
+                cached_chunk: std::cell::Cell::new(None),
             };
             can_be_reached_by_noxious_gas(&level, source, eye)
         };
@@ -356,6 +359,7 @@ impl Game<'_> {
             facts: self.res.facts(),
             collision: self.collision,
             player: None,
+            cached_chunk: std::cell::Cell::new(None),
         };
         let height = unobstructed_block_count(&level, [pos.0, pos.1 + 1, pos.2], water_blocks);
         let area = launch_area(pos, height);
@@ -419,6 +423,7 @@ impl Game<'_> {
                 facts: self.res.facts(),
                 collision: self.collision,
                 player: None,
+                cached_chunk: std::cell::Cell::new(None),
             };
             unobstructed_block_count(&level, [pos.0, pos.1 + 1, pos.2], water_blocks)
         };

crates/horizon-client/src/game/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 crate::game::Game;
+use super::{Dim, Game};
 use horizon_client::{
     extras::Corner,
     extras_hud::Corners,
@@ -14,7 +14,7 @@ use std::sync::Arc;
 use winit::event::MouseButton;
 
 #[derive(Default)]
-pub(in crate::game) struct PvpState {
+pub(super) 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(in crate::game) 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(in crate::game) boxes: Vec<(pvp_hud::WidgetId, [f32; 4])>,
+    pub(super) boxes: Vec<(pvp_hud::WidgetId, [f32; 4])>,
     /// The HUD editor, while it is open.
-    pub(in crate::game) editor: Option<crate::game::hud_editor::HudEditor>,
+    pub(super) editor: Option<super::hud_editor::HudEditor>,
     /// The open chat's box holds a chat search's query (Ctrl+F).
-    pub(in crate::game) chat_search: bool,
+    pub(super) chat_search: bool,
     /// What the chat box held when the search borrowed it.
-    pub(in crate::game) chat_search_aside: String,
+    pub(super) 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(in crate::game) fn custom_crosshair(&self) -> bool {
+    pub(super) 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(in crate::game) fn draw_custom_crosshair(&mut self, batch: &mut HudBatch, w: i32, h: i32) {
+    pub(super) 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(in crate::game) fn outline_fill(
+    pub(super) fn outline_fill(
         &self,
         outline: &[[f64; 6]],
         camera: glam::DVec3,
@@ -176,33 +176,42 @@ impl Game<'_> {
             }
         }
     }
-    /// 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) {
+    /// Once per frame: the options that live outside the game's state.
+    pub(super) 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));
     }
-    /// 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
+    /// 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
     }
-    /// 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;
+    /// 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),
+        }
     }
     /// 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(in crate::game) fn pvp_attacked(&mut self, id: i32, distance: f64) {
+    pub(super) 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(in crate::game) fn pvp_click(&mut self, button: MouseButton) {
+    pub(super) fn pvp_click(&mut self, button: MouseButton) {
         let hud = &self.settings.extras.pvp.hud;
-        if !(hud.cps || hud.keys) || self.screen != crate::game::Screen::Playing {
+        if !(hud.cps || hud.keys) || self.screen != super::Screen::Playing {
             return;
         }
         let i = match button {
@@ -223,7 +232,7 @@ 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(in crate::game) fn pvp_hurt(&mut self, id: i32, own: bool, by_me: Option<bool>) {
+    pub(super) fn pvp_hurt(&mut self, id: i32, own: bool, by_me: Option<bool>) {
         if own {
             self.pvp.combo.broken();
         } else {
@@ -231,9 +240,13 @@ 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(in crate::game) fn draw_pvp_hud(&mut self, batch: &mut HudBatch, corners: &mut Corners) {
+    pub(super) 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.
@@ -254,8 +267,8 @@ 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.
-        let server = self.last_server.address().filter(|_| multiplayer);
+        // The address is copied only when it changed (`server_address` borrows the whole game).
+        let server = self.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();
@@ -678,7 +691,7 @@ impl Game<'_> {
             false => s.item == held.item,
         };
         let slots = self.inventory.iter().map(Option::as_ref).enumerate();
-        let offhand = std::iter::once((crate::game::shield::OFFHAND_SLOT, self.offhand.as_ref()));
+        let offhand = std::iter::once((super::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/remote.rs

@@ -60,6 +60,9 @@ use std::{
 };
 use winit::{event::MouseButton, keyboard::KeyCode};
 
+#[path = "remote_poll.rs"]
+mod poll;
+
 type BuiltinCache = Vec<(std::path::PathBuf, Arc<Builtin>)>;
 static BUILTIN: std::sync::Mutex<BuiltinCache> = std::sync::Mutex::new(Vec::new());
 
@@ -979,7 +982,7 @@ impl Game<'_> {
         lan: bool,
         realm: bool,
     ) -> Result<()> {
-        self.last_server.realm = realm;
+        self.realm_session = realm;
         self.reset_tutorial();
         self.perf.world_opening();
         // A server's own biomes come over the connection; the last local
@@ -1027,7 +1030,7 @@ impl Game<'_> {
                 root.clone(),
             ),
             None => {
-                self.last_server.connecting(address, name, lan);
+                self.extras_connecting(address, name, lan);
                 match cookies {
                     Some(cookies) => Session::connect_transferred(
                         address,
@@ -1522,7 +1525,7 @@ impl Game<'_> {
         self.finish_perf();
         if reason.is_none() {
             // Leaving on purpose: nothing for auto-reconnect to retry.
-            self.last_server.left();
+            self.extras_left();
         }
         self.clear_waypoints();
         self.hud_disconnected();
@@ -1566,7 +1569,7 @@ impl Game<'_> {
         self.left = false;
         self.right = false;
         // The shared world is closing: its invite code ends with it.
-        self.friends_lan_closed();
+        self.lan_closed_hooks();
         // Single player's server thread saves the world before the title shows.
         let single_player = match self.integrated.take() {
             Some(server) => {
@@ -2174,288 +2177,6 @@ impl Game<'_> {
     pub(super) fn remote_backlog(&self) -> usize {
         self.remote.as_ref().map_or(0, |r| r.backlog.len())
     }
-    /// A headless command oracle has a real connection but no movement tick.
-    /// Acknowledge loaded terrain without predicting or sending movement.
-    pub(super) fn poll_stationary_client(&mut self) -> Result<()> {
-        self.poll_remote()?;
-        let loaded = self.player.as_ref().is_some_and(|p| {
-            self.streaming.is_lit(
-                (p.position.x.floor() as i32) >> 4,
-                (p.position.z.floor() as i32) >> 4,
-            )
-        });
-        if loaded && self.remote.as_ref().is_some_and(|r| !r.loaded_sent) {
-            self.send(S::PlayerLoaded(Empty));
-            let r = self.remote.as_mut().unwrap();
-            r.loaded_sent = true;
-            r.level_load.finish();
-        }
-        Ok(())
-    }
-
-    /// Process what the network thread received (once per frame, like the
-    /// client's packet processor), in order. Chunk packets get
-    /// `CHUNK_PACKETS_PER_FRAME`: once a frame has spent it, the events from
-    /// the next chunk packet on wait for the next frame, unless they have
-    /// already waited `BACKLOG_LIMIT`. A chunk packet still decoding holds
-    /// back what follows it.
-    pub(super) fn poll_remote(&mut self) -> Result<()> {
-        let polled = self.poll_remote_events();
-        // The block events and block changes of a piston clock start and end
-        // thousands of moves at once: the collision view and the renderer
-        // take them all in one sync, before the tick or frame reads them.
-        if std::mem::take(&mut self.moving_pistons_stale) {
-            self.sync_moving_pistons();
-        }
-        polled
-    }
-    fn poll_remote_events(&mut self) -> Result<()> {
-        let Some(r) = self.remote.as_mut() else {
-            return Ok(());
-        };
-        let mut events = std::mem::take(&mut r.backlog);
-        // Chunk packets start decoding now; the frame that reaches one in
-        // order inserts its column.
-        for event in r.session.poll() {
-            events.push_back(match event {
-                Event::Packet(p) if matches!(*p, C::LevelChunkWithLight(_)) => {
-                    match r.decoder.submit(r.chunk_format.clone(), p) {
-                        None => Received::Chunk(r.chunk_format.clone()),
-                        Some(p) => Received::Event(Event::Packet(p)),
-                    }
-                }
-                event => Received::Event(event),
-            });
-        }
-        let overdue = r
-            .backlog_since
-            .is_some_and(|since| since.elapsed() >= BACKLOG_LIMIT);
-        let mut chunks = Duration::ZERO;
-        // A run of ForgetLevelChunk (thousands when the server's view moves far: a
-        // teleport at 32 chunks) is forgotten at once, before whatever follows it.
-        let mut forgotten = horizon_client::fast_hash::FxHashSet::default();
-        while let Some(item) = events.pop_front() {
-            if let Received::Event(Event::Packet(packet)) = &item
-                && let C::ForgetLevelChunk(p) = &**packet
-            {
-                self.native_client_packet(packet);
-                forgotten.insert((p.pos[0], p.pos[1]));
-                continue;
-            }
-            self.forget_remote_columns(&mut forgotten);
-            let chunk = matches!(item, Received::Chunk(_));
-            if chunk && !overdue && chunks >= CHUNK_PACKETS_PER_FRAME {
-                events.push_front(item);
-                break;
-            }
-            let started = chunk.then(Instant::now);
-            let event = match item {
-                Received::Event(event) => event,
-                Received::Chunk(format) => {
-                    // A column still decoding waits for the next frame, with
-                    // what came after it, overdue or not.
-                    let Some(next) = self.remote.as_ref().map(|r| r.decoder.next()) else {
-                        break;
-                    };
-                    let (packet, column) = match next {
-                        Next::Ready(decoded) => decoded,
-                        Next::Decoding => {
-                            events.push_front(Received::Chunk(format));
-                            break;
-                        }
-                        Next::Lost => {
-                            log::warn!("Horizon: the chunk decoder stopped; a column is missing");
-                            continue;
-                        }
-                    };
-                    self.native_client_packet(&packet);
-                    if let C::LevelChunkWithLight(p) = *packet {
-                        self.remote_chunk(&p, Some((&format, column)));
-                    }
-                    chunks += started.map_or(Duration::ZERO, |t| t.elapsed());
-                    continue;
-                }
-            };
-            match event {
-                Event::Status(s) => {
-                    if let Some(r) = self.remote.as_mut() {
-                        r.status = s;
-                    }
-                }
-                Event::Joined {
-                    registries,
-                    name,
-                    uuid,
-                } => {
-                    self.set_registries(registries);
-                    self.last_server.joined();
-                    // handleLogin: the level loading screen replaces any dialog.
-                    self.close_dialogs();
-                    if let Some(r) = self.remote.as_mut() {
-                        r.joined = true;
-                        // handleLogin: startWaitingForNewLevel with Reason.OTHER.
-                        r.profile = uuid;
-                        r.profile_name = name.clone();
-                        // LevelLoadingScreen's line: no player name.
-                        r.status = horizon_client::lang::get_or(
-                            "multiplayer.downloadingTerrain",
-                            "Loading terrain...",
-                        );
-                    }
-                }
-                Event::Features(features) => {
-                    if let Some(remote) = &mut self.remote {
-                        remote.features = features;
-                    }
-                }
-                Event::Brand(brand) => {
-                    if let Some(remote) = &mut self.remote {
-                        remote.brand = brand;
-                    }
-                }
-                Event::QuietCommands => {
-                    if let Some(remote) = &mut self.remote {
-                        remote.quiet_commands = true;
-                    }
-                }
-                Event::ModNet => {
-                    if let Some(remote) = &mut self.remote {
-                        remote.mod_net = true;
-                    }
-                }
-                Event::FarTerrain(offer) => {
-                    if let Some(remote) = &mut self.remote {
-                        remote.far_terrain = Some(offer);
-                    }
-                }
-                Event::Reconfiguring => {
-                    // handleConfigurationStart: the held-back chat shows, then
-                    // clearClientLevel opens ServerReconfigScreen over no level.
-                    self.flush_chat_queue();
-                    self.send_chat_acknowledgement();
-                    self.close_dialogs();
-                    // The server configuring us now (a proxy's next one)
-                    // offers its own far terrain, or none, and announces its
-                    // own features again (a Horizon server's quiet commands).
-                    if let Some(remote) = &mut self.remote {
-                        remote.far_terrain = None;
-                        remote.quiet_commands = false;
-                        remote.mod_net = false;
-                    }
-                    self.clear_lod();
-                    if let Some(remote) = &self.remote {
-                        remote.session.reset_far_terrain();
-                    }
-                    self.player = None;
-                    self.screen = Screen::Playing;
-                    self.capture(false);
-                    // clearClientLevel drops the client level now, so its
-                    // unload comes before the configuration screen, not
-                    // after the next login's load.
-                    if let Some(old) = self.remote.as_mut().and_then(|r| r.heard_level.take()) {
-                        self.native_client_level_unload(&old);
-                    }
-                    let ticks = self.ticks;
-                    if let Some(r) = self.remote.as_mut() {
-                        r.reconfiguring = Some(ticks);
-                        r.chat_tree_received = false;
-                    }
-                }
-                Event::Reconfigured(registries) => {
-                    // handleConfigurationStart → clearClientLevel, and the next
-                    // ClientPacketListener starts with no players or scoreboard,
-                    // no waypoints (its own ClientWaypointManager: a proxy's next
-                    // server never untracks the last one's), and its new
-                    // ClientSuggestionProvider with no custom chat completions.
-                    // clearClientLevel clears the narrator.
-                    self.clear_narrator();
-                    self.hud_disconnected();
-                    self.score.board = Default::default();
-                    self.clear_waypoints();
-                    if let Some(r) = self.remote.as_mut() {
-                        r.attachments.clear();
-                        r.players.clear();
-                        r.tab_players.clear();
-                        r.listed.clear();
-                        r.signatures = Default::default();
-                        r.custom_completions.clear();
-                    }
-                    self.ui.registries.custom_completions.clear();
-                    self.set_registries(registries);
-                }
-                // handleTransfer: "Cannot transfer to server from
-                // singleplayer" (no ServerData), so the world just closes.
-                Event::Transfer { host, port } => {
-                    if let Some(r) = self.remote.as_mut()
-                        && r.session.address != "local"
-                    {
-                        r.transfer = Some(format!("{host}:{port}"));
-                    }
-                }
-                Event::PackPush(p) => self.handle_pack_push(p),
-                Event::PackPop(id) => self.handle_pack_pop(id),
-                Event::ServerLinks(links) => {
-                    if let Some(r) = self.remote.as_mut() {
-                        r.server_links = super::server_links::trusted(links);
-                    }
-                }
-                Event::ShowDialog(dialog) => self.show_dialog(&dialog),
-                Event::ClearDialog => self.clear_dialog(),
-                Event::CodeOfConduct(text) => self.handle_code_of_conduct(text),
-                Event::DecodeError(e) => {
-                    if let Some(r) = self.remote.as_mut() {
-                        r.decode_errors += 1;
-                        if r.decode_errors <= 20 {
-                            log::warn!("Horizon: skipped undecodable packet {e}");
-                        }
-                    }
-                }
-                Event::Disconnected {
-                    reason,
-                    key,
-                    from_server,
-                } => {
-                    log::info!("Horizon: disconnected: {reason}");
-                    // ClientboundTransferPacket left a target: connect there
-                    // instead of showing the disconnect, the stored cookies
-                    // carried over (ClientCommonPacketListenerImpl.
-                    // handleTransfer → ConnectScreen.startConnecting).
-                    let transfer = self.remote.as_mut().and_then(|r| {
-                        r.transfer.take().map(|address| {
-                            (address, r.session.name.clone(), r.session.cookies.clone())
-                        })
-                    });
-                    if let Some((address, name, cookies)) = transfer {
-                        self.leave_server(None)?;
-                        self.connect_server_with_cookies(&address, &name, Some(cookies))?;
-                        return Ok(());
-                    }
-                    let plan = self.last_server.ended(&reason, key.as_deref(), from_server);
-                    self.leave_server(Some(reason))?;
-                    horizon_client::last_server::offer(self.title.as_mut(), plan);
-                    return Ok(());
-                }
-                Event::Packet(packet) => self.handle_packet(*packet)?,
-            }
-            chunks += started.map_or(Duration::ZERO, |t| t.elapsed());
-            if self.remote.is_none() {
-                break;
-            }
-        }
-        if self.remote.is_some() {
-            self.forget_remote_columns(&mut forgotten);
-        }
-        if let Some(r) = self.remote.as_mut() {
-            r.backlog_since = if events.is_empty() {
-                None
-            } else {
-                Some(r.backlog_since.unwrap_or_else(Instant::now))
-            };
-            r.backlog = events;
-        }
-        self.send_suggestion_request();
-        Ok(())
-    }
     /// ClientSuggestionProvider.customSuggestion: the chat's completion
     /// request for an `ask_server` node goes to the server.
     fn send_suggestion_request(&mut self) {
@@ -3873,7 +3594,7 @@ impl Game<'_> {
             C::Explode(p) => self.remote_explode(&p),
             C::Sound(p) => {
                 if let Some(name) = self.remote_sound_name(&p.sound)
-                    && !self.sound_muted(&name)
+                    && !self.settings.extras.pvp.combat.mutes_sound(&name)
                 {
                     let at = [
                         f64::from(p.x) / 8.0,
@@ -3895,7 +3616,7 @@ impl Game<'_> {
             }
             C::SoundEntity(p) => {
                 if let Some(name) = self.remote_sound_name(&p.sound)
-                    && !self.sound_muted(&name)
+                    && !self.settings.extras.pvp.combat.mutes_sound(&name)
                     && let Some(state) = self.remote_sound_entity_state(p.id)
                 {
                     let source = usize::try_from(p.source)
@@ -6746,7 +6467,7 @@ 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.last_server.address().is_some() {
+        if self.integrated.is_none() && self.server_address().is_some() {
             keys.analog = None;
         }
         let [mut strafe, mut forward] = keys.direction();
@@ -7083,24 +6804,24 @@ impl Game<'_> {
         let mut push = Vec3::ZERO;
         let order = |id: u32| r.ticked_before_player.contains(&id) == before_player;
         for m in self.mobs.iter().filter(|m| order(m.id)) {
-            let listed = r
-                .level_players
-                .get(&(m.id as i32))
-                .and_then(|uuid| r.tab_players.get(uuid));
-            let spectator = listed.is_some_and(|t| t.game_mode == SPECTATOR);
-            let mob_team = match listed {
-                Some(t) => board.players_team(&t.name),
-                None => teams.of(Who::Mob(m.id)),
-            };
-            // Bats never push; a spectator has no physics; passengers of the
-            // same vehicle never push each other.
+            // Bats never push, nor passengers of one vehicle, nor a spectator; the
+            // box test comes before the lookups that far mobs never need (#14053).
             if !m.alive()
-                || spectator
                 || m.species() == horizon_client::mobs::Species::Bat
                 || self
                     .riding
                     .is_some_and(|v| v == m.id || m.extra.mount == Some(v))
                 || !m.bounds().intersects(bounds)
+            {
+                continue;
+            }
+            let listed = r
+                .level_players
+                .get(&(m.id as i32))
+                .and_then(|uuid| r.tab_players.get(uuid));
+            let mob_team =
+                listed.map_or_else(|| teams.of(Who::Mob(m.id)), |t| board.players_team(&t.name));
+            if listed.is_some_and(|t| t.game_mode == SPECTATOR)
                 || !horizon_client::scoreboard::pushable_by(mob_team, player_team, true)
             {
                 continue;

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

@@ -0,0 +1,288 @@
+//! The server connection's received events, once a frame (`poll_remote`): chunk packets
+//! within their per-frame budget, then every other packet in order (`handle_packet`).
+use super::*;
+
+impl Game<'_> {
+    /// A headless command oracle has a real connection but no movement tick.
+    /// Acknowledge loaded terrain without predicting or sending movement.
+    pub(in crate::game) fn poll_stationary_client(&mut self) -> Result<()> {
+        self.poll_remote()?;
+        let loaded = self.player.as_ref().is_some_and(|p| {
+            self.streaming.is_lit(
+                (p.position.x.floor() as i32) >> 4,
+                (p.position.z.floor() as i32) >> 4,
+            )
+        });
+        if loaded && self.remote.as_ref().is_some_and(|r| !r.loaded_sent) {
+            self.send(S::PlayerLoaded(Empty));
+            let r = self.remote.as_mut().unwrap();
+            r.loaded_sent = true;
+            r.level_load.finish();
+        }
+        Ok(())
+    }
+
+    /// Process what the network thread received (once per frame, like the
+    /// client's packet processor), in order. Chunk packets get
+    /// `CHUNK_PACKETS_PER_FRAME`: once a frame has spent it, the events from
+    /// the next chunk packet on wait for the next frame, unless they have
+    /// already waited `BACKLOG_LIMIT`. A chunk packet still decoding holds
+    /// back what follows it.
+    pub(in crate::game) fn poll_remote(&mut self) -> Result<()> {
+        let polled = self.poll_remote_events();
+        // The block events and block changes of a piston clock start and end
+        // thousands of moves at once: the collision view and the renderer
+        // take them all in one sync, before the tick or frame reads them.
+        if std::mem::take(&mut self.moving_pistons_stale) {
+            self.sync_moving_pistons();
+        }
+        polled
+    }
+    fn poll_remote_events(&mut self) -> Result<()> {
+        let Some(r) = self.remote.as_mut() else {
+            return Ok(());
+        };
+        let mut events = std::mem::take(&mut r.backlog);
+        // Chunk packets start decoding now; the frame that reaches one in
+        // order inserts its column.
+        for event in r.session.poll() {
+            events.push_back(match event {
+                Event::Packet(p) if matches!(*p, C::LevelChunkWithLight(_)) => {
+                    match r.decoder.submit(r.chunk_format.clone(), p) {
+                        None => Received::Chunk(r.chunk_format.clone()),
+                        Some(p) => Received::Event(Event::Packet(p)),
+                    }
+                }
+                event => Received::Event(event),
+            });
+        }
+        let overdue = r
+            .backlog_since
+            .is_some_and(|since| since.elapsed() >= BACKLOG_LIMIT);
+        let mut chunks = Duration::ZERO;
+        // A run of ForgetLevelChunk (thousands when the server's view moves far: a
+        // teleport at 32 chunks) is forgotten at once, before whatever follows it.
+        let mut forgotten = horizon_client::fast_hash::FxHashSet::default();
+        while let Some(item) = events.pop_front() {
+            if let Received::Event(Event::Packet(packet)) = &item
+                && let C::ForgetLevelChunk(p) = &**packet
+            {
+                self.native_client_packet(packet);
+                forgotten.insert((p.pos[0], p.pos[1]));
+                continue;
+            }
+            self.forget_remote_columns(&mut forgotten);
+            let chunk = matches!(item, Received::Chunk(_));
+            if chunk && !overdue && chunks >= CHUNK_PACKETS_PER_FRAME {
+                events.push_front(item);
+                break;
+            }
+            let started = chunk.then(Instant::now);
+            let event = match item {
+                Received::Event(event) => event,
+                Received::Chunk(format) => {
+                    // A column still decoding waits for the next frame, with
+                    // what came after it, overdue or not.
+                    let Some(next) = self.remote.as_ref().map(|r| r.decoder.next()) else {
+                        break;
+                    };
+                    let (packet, column) = match next {
+                        Next::Ready(decoded) => decoded,
+                        Next::Decoding => {
+                            events.push_front(Received::Chunk(format));
+                            break;
+                        }
+                        Next::Lost => {
+                            log::warn!("Horizon: the chunk decoder stopped; a column is missing");
+                            continue;
+                        }
+                    };
+                    self.native_client_packet(&packet);
+                    if let C::LevelChunkWithLight(p) = *packet {
+                        self.remote_chunk(&p, Some((&format, column)));
+                    }
+                    chunks += started.map_or(Duration::ZERO, |t| t.elapsed());
+                    continue;
+                }
+            };
+            match event {
+                Event::Status(s) => {
+                    if let Some(r) = self.remote.as_mut() {
+                        r.status = s;
+                    }
+                }
+                Event::Joined {
+                    registries,
+                    name,
+                    uuid,
+                } => {
+                    self.set_registries(registries);
+                    self.extras_joined();
+                    // handleLogin: the level loading screen replaces any dialog.
+                    self.close_dialogs();
+                    if let Some(r) = self.remote.as_mut() {
+                        r.joined = true;
+                        // handleLogin: startWaitingForNewLevel with Reason.OTHER.
+                        r.profile = uuid;
+                        r.profile_name = name.clone();
+                        // LevelLoadingScreen's line: no player name.
+                        r.status = horizon_client::lang::get_or(
+                            "multiplayer.downloadingTerrain",
+                            "Loading terrain...",
+                        );
+                    }
+                }
+                Event::Features(features) => {
+                    if let Some(remote) = &mut self.remote {
+                        remote.features = features;
+                    }
+                }
+                Event::Brand(brand) => {
+                    if let Some(remote) = &mut self.remote {
+                        remote.brand = brand;
+                    }
+                }
+                Event::QuietCommands => {
+                    if let Some(remote) = &mut self.remote {
+                        remote.quiet_commands = true;
+                    }
+                }
+                Event::ModNet => {
+                    if let Some(remote) = &mut self.remote {
+                        remote.mod_net = true;
+                    }
+                }
+                Event::FarTerrain(offer) => {
+                    if let Some(remote) = &mut self.remote {
+                        remote.far_terrain = Some(offer);
+                    }
+                }
+                Event::Reconfiguring => {
+                    // handleConfigurationStart: the held-back chat shows, then
+                    // clearClientLevel opens ServerReconfigScreen over no level.
+                    self.flush_chat_queue();
+                    self.send_chat_acknowledgement();
+                    self.close_dialogs();
+                    // The server configuring us now (a proxy's next one)
+                    // offers its own far terrain, or none, and announces its
+                    // own features again (a Horizon server's quiet commands).
+                    if let Some(remote) = &mut self.remote {
+                        remote.far_terrain = None;
+                        remote.quiet_commands = false;
+                        remote.mod_net = false;
+                    }
+                    self.clear_lod();
+                    if let Some(remote) = &self.remote {
+                        remote.session.reset_far_terrain();
+                    }
+                    self.player = None;
+                    self.screen = Screen::Playing;
+                    self.capture(false);
+                    // clearClientLevel drops the client level now, so its
+                    // unload comes before the configuration screen, not
+                    // after the next login's load.
+                    if let Some(old) = self.remote.as_mut().and_then(|r| r.heard_level.take()) {
+                        self.native_client_level_unload(&old);
+                    }
+                    let ticks = self.ticks;
+                    if let Some(r) = self.remote.as_mut() {
+                        r.reconfiguring = Some(ticks);
+                        r.chat_tree_received = false;
+                    }
+                }
+                Event::Reconfigured(registries) => {
+                    // handleConfigurationStart → clearClientLevel, and the next
+                    // ClientPacketListener starts with no players or scoreboard,
+                    // no waypoints (its own ClientWaypointManager: a proxy's next
+                    // server never untracks the last one's), and its new
+                    // ClientSuggestionProvider with no custom chat completions.
+                    // clearClientLevel clears the narrator.
+                    self.clear_narrator();
+                    self.hud_disconnected();
+                    self.score.board = Default::default();
+                    self.clear_waypoints();
+                    if let Some(r) = self.remote.as_mut() {
+                        r.attachments.clear();
+                        r.players.clear();
+                        r.tab_players.clear();
+                        r.listed.clear();
+                        r.signatures = Default::default();
+                        r.custom_completions.clear();
+                    }
+                    self.ui.registries.custom_completions.clear();
+                    self.set_registries(registries);
+                }
+                // handleTransfer: "Cannot transfer to server from
+                // singleplayer" (no ServerData), so the world just closes.
+                Event::Transfer { host, port } => {
+                    if let Some(r) = self.remote.as_mut()
+                        && r.session.address != "local"
+                    {
+                        r.transfer = Some(format!("{host}:{port}"));
+                    }
+                }
+                Event::PackPush(p) => self.handle_pack_push(p),
+                Event::PackPop(id) => self.handle_pack_pop(id),
+                Event::ServerLinks(links) => {
+                    if let Some(r) = self.remote.as_mut() {
+                        r.server_links = super::super::server_links::trusted(links);
+                    }
+                }
+                Event::ShowDialog(dialog) => self.show_dialog(&dialog),
+                Event::ClearDialog => self.clear_dialog(),
+                Event::CodeOfConduct(text) => self.handle_code_of_conduct(text),
+                Event::DecodeError(e) => {
+                    if let Some(r) = self.remote.as_mut() {
+                        r.decode_errors += 1;
+                        if r.decode_errors <= 20 {
+                            log::warn!("Horizon: skipped undecodable packet {e}");
+                        }
+                    }
+                }
+                Event::Disconnected {
+                    reason,
+                    key,
+                    from_server,
+                } => {
+                    log::info!("Horizon: disconnected: {reason}");
+                    // ClientboundTransferPacket left a target: connect there
+                    // instead of showing the disconnect, the stored cookies
+                    // carried over (ClientCommonPacketListenerImpl.
+                    // handleTransfer → ConnectScreen.startConnecting).
+                    let transfer = self.remote.as_mut().and_then(|r| {
+                        r.transfer.take().map(|address| {
+                            (address, r.session.name.clone(), r.session.cookies.clone())
+                        })
+                    });
+                    if let Some((address, name, cookies)) = transfer {
+                        self.leave_server(None)?;
+                        self.connect_server_with_cookies(&address, &name, Some(cookies))?;
+                        return Ok(());
+                    }
+                    let retry = self.reconnect_after(&reason, key.as_deref(), from_server);
+                    self.leave_server(Some(reason))?;
+                    self.offer_reconnect(retry);
+                    return Ok(());
+                }
+                Event::Packet(packet) => self.handle_packet(*packet)?,
+            }
+            chunks += started.map_or(Duration::ZERO, |t| t.elapsed());
+            if self.remote.is_none() {
+                break;
+            }
+        }
+        if self.remote.is_some() {
+            self.forget_remote_columns(&mut forgotten);
+        }
+        if let Some(r) = self.remote.as_mut() {
+            r.backlog_since = if events.is_empty() {
+                None
+            } else {
+                Some(r.backlog_since.unwrap_or_else(Instant::now))
+            };
+            r.backlog = events;
+        }
+        self.send_suggestion_request();
+        Ok(())
+    }
+}

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.clear_fluids().0,
-            full_water_vision: self.clear_fluids().1,
+                || self.settings.extras.pvp.tweaks.clear_lava,
+            full_water_vision: self.settings.extras.pvp.tweaks.clear_water,
             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: self.fire_lower(),
+            fire_lower: f32::from(self.settings.extras.pvp.tweaks.fire_lower) / 100.0,
             gui_overlays: &gui_overlays,
         })
     }
@@ -679,6 +679,7 @@ impl Game<'_> {
                 .player
                 .as_ref()
                 .map(|p| ([p.position.x, p.position.y, p.position.z], p.velocity.y)),
+            cached_chunk: std::cell::Cell::new(None),
         };
         laps.lap("tp_level");
         // Resource packs' Polytone entity emitters on the player (#11486): fog, dust and
@@ -725,6 +726,37 @@ impl Game<'_> {
             }
         }
     }
+
+    /// The ticks the frame shows (animated textures, the HUD, a shader pack's clock): the
+    /// client's, or under `HORIZON_STILL` (`FixedStep::still`) the world's game time, which
+    /// moves only while the world runs.
+    pub(super) fn visual_ticks(&self) -> u64 {
+        if self.clock.still() {
+            self.world.game_time.max(0) as u64
+        } else {
+            self.ticks
+        }
+    }
+
+    /// The clock of the animated textures: `Minecraft.runTick` ticks the `TextureManager`
+    /// only while the level runs normally. Under `HORIZON_STILL` it is the world's ticks.
+    pub(super) fn texture_clock(&self) -> u64 {
+        if self.clock.still() {
+            self.visual_ticks()
+        } else {
+            self.texture_ticks
+        }
+    }
+
+    /// `Util.getMillis` for what the frame shows (the world border's scroll, the hearts' blink,
+    /// the glint's under the switch): under `HORIZON_STILL`, the world's ticks in milliseconds.
+    pub(super) fn visual_millis(&self) -> i64 {
+        if self.clock.still() {
+            self.visual_ticks() as i64 * 50
+        } else {
+            self.started.elapsed().as_millis() as i64
+        }
+    }
 }
 impl Game<'_> {
     /// What the packs' Polytone animation modes read this tick (wiki "Variant Textures"): the

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

@@ -190,7 +190,7 @@ impl PackResources {
                 let clouds = named_scope(scope, "pack.clouds", || load_clouds(root));
                 let forcefield = named_scope(scope, "pack.forcefield", || load_forcefield(root));
                 let custom_sky = named_scope(scope, "pack.custom_sky", || {
-                    horizon_client::custom_sky::CustomSky::load(root)
+                    horizon_client::custom_sky::load(root)
                 });
                 let environments =
                     named_scope(scope, "pack.environments", || pack_environments(root));
@@ -246,7 +246,7 @@ impl PackResources {
             names: Arc::new(names),
             clouds: Arc::new(clouds),
             forcefield: Arc::new(forcefield),
-            custom_sky: Arc::new(custom_sky),
+            custom_sky,
             environments,
             polytone_particles,
             polytone_post,

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

@@ -307,7 +307,7 @@ impl Game<'_> {
         self.remote.is_some() && self.integrated.is_none()
     }
     pub(super) fn draw_pause_menu(&mut self, batch: &mut HudBatch) {
-        let friends = self.friends_view().shown;
+        let friends = self.friends_shown();
         let atlas = &self.gui.atlas;
         let (w, h) = (batch.width, batch.height);
         ui::menu_background(batch, atlas, 0.0, 0.0, w, h, true);
@@ -375,11 +375,7 @@ impl Game<'_> {
             // The icon has no label: name it for controller focus and the
             // control socket's widget tree.
             if i == FRIENDS_ICON {
-                horizon_client::widgets::record(
-                    horizon_client::friends_screen::TITLE,
-                    [x, y, 20.0, 20.0],
-                    active,
-                );
+                horizon_client::widgets::record(super::friends::TITLE, [x, y, 20.0, 20.0], active);
             }
             ui::button(
                 batch,
@@ -416,7 +412,7 @@ impl Game<'_> {
             batch.sprite_scaled(atlas, sprite, x + 3.0, y + 3.0, 15.0, 15.0, u32::MAX);
             if hover {
                 tooltip = Some(if i == FRIENDS_ICON {
-                    Text::literal(horizon_client::friends_screen::title())
+                    Text::literal(super::friends::title())
                 } else {
                     Text::translate(ICON_LABELS[i], &[])
                 });
@@ -509,9 +505,8 @@ impl Game<'_> {
                 .map(|i| 12 + i as u8)
         })
         .or_else(|| {
-            (self.friends_view().shown
-                && ui::hovered(self.cursor, friends.0, friends.1, 20.0, 20.0))
-            .then_some(10)
+            (self.friends_shown() && ui::hovered(self.cursor, friends.0, friends.1, 20.0, 20.0))
+                .then_some(10)
         });
         if let Some(id) = hit {
             self.pause_focus = Some(id);
@@ -539,7 +534,7 @@ impl Game<'_> {
             self.options.split_guest || self.split_hud.menu,
         );
         let mut active_ids: Vec<u8> = buttons.into_iter().filter(|b| b.5).map(|b| b.4).collect();
-        let friends = self.friends_view().shown;
+        let friends = self.friends_shown();
         active_ids.extend(pause_icon_focus_ids(friends));
         if active_ids.is_empty() {
             return Ok(());
@@ -591,7 +586,7 @@ impl Game<'_> {
                     .filter(|b| b.5)
                     .map(|b| (b.4, b.0, b.1, b.2))
                     .collect();
-                let friends = self.friends_view().shown;
+                let friends = self.friends_shown();
                 for (i, (x, y, _)) in pause_icons(
                     w,
                     h,

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

@@ -0,0 +1,115 @@
+//! The window's world as `horizon_hooks::share` shows it to the crates that share it past the
+//! LAN (Play with Friends), and where the engine calls `Hooks::share` and `Hooks::lan_closed`.
+use super::{Game, lan::LanSettings};
+use horizon_client::text::Text;
+use horizon_hooks::share::{LanOptions, ShareView};
+
+/// The window's own player: not the integrated server's thread, not a splitscreen guest (it
+/// plays P1's world and can't share it; its leaving doesn't close it).
+fn shares(game: &Game<'_>) -> bool {
+    !game.serving() && !game.options.split_guest
+}
+
+/// Play with Friends' host side (game/friends.rs) hears the hooks, until it moves to
+/// horizon-friends (spec #14167). Before the hooks are sealed.
+#[cfg(feature = "friends")]
+pub(crate) fn register_friends() {
+    if horizon_hooks::register(&super::friends::HOOKS).is_err() {
+        log::warn!("Play with Friends registered after the game started: sharing is off");
+    }
+}
+
+impl Game<'_> {
+    /// `Hooks::share`, once a client tick (`Minecraft.runTick`, so also while paused).
+    pub(super) fn share_tick(&mut self) {
+        if shares(self) {
+            horizon_hooks::engine::share(&mut World(self));
+        }
+    }
+
+    /// `Hooks::lan_closed`: the world stopped being open to LAN, or the player left it.
+    pub(super) fn lan_closed_hooks(&self) {
+        if shares(self) {
+            horizon_hooks::engine::lan_closed();
+        }
+    }
+
+    /// A singleplayer world runs on this window's server thread, so it can be shared, as Open
+    /// to LAN publishes it; another server can't be.
+    pub(super) fn can_share(&self) -> bool {
+        self.title.is_none() && (self.remote.is_none() || self.integrated.is_some())
+    }
+}
+
+impl<'g> Game<'g> {
+    /// The view of this window's world, for the engine's own Friends screen and command until
+    /// they move to the crate.
+    #[cfg(feature = "friends")]
+    pub(super) fn share_view(&mut self) -> World<'_, 'g> {
+        World(self)
+    }
+}
+
+pub(super) struct World<'a, 'g>(&'a mut Game<'g>);
+
+impl ShareView for World<'_, '_> {
+    fn can_share(&self) -> bool {
+        self.0.can_share()
+    }
+
+    fn lan_port(&self) -> Option<u16> {
+        self.0.lan_port()
+    }
+
+    fn open_lan(&mut self, options: LanOptions) -> Result<u16, String> {
+        self.0
+            .lan_open(LanSettings {
+                port: horizon_client::lan::available_port(),
+                guest_commands: options.guest_commands,
+                force_game_mode: options.force_game_mode,
+            })
+            .map_err(|e| e.to_string())?;
+        self.0
+            .lan_port()
+            .ok_or_else(|| "the world isn't open to LAN".to_owned())
+    }
+
+    fn close_lan(&mut self) {
+        self.0.lan_close(true);
+    }
+
+    fn players(&self, each: &mut dyn FnMut(&str)) {
+        let g = &self.0;
+        if let Some(host) = &g.lan {
+            for guest in &host.hub.guests {
+                each(&guest.name);
+            }
+        } else if g.integrated.is_some() {
+            // On the server thread: the other players the server lists.
+            let me = g.options.player_name();
+            for name in g.remote_online_names().unwrap_or_default() {
+                if name != me {
+                    each(&name);
+                }
+            }
+        }
+    }
+
+    fn chat(&mut self, text: &str) {
+        self.0.system_message(Text::literal(text));
+    }
+
+    fn copy(&mut self, text: &str) {
+        use horizon_client::clipboard::Clipboard;
+        self.0.clipboard.set(text);
+    }
+
+    fn open_url(&mut self, url: &str) {
+        // The system browser, as the folder buttons open their folders.
+        super::packs::open_uri(url);
+    }
+
+    fn tr(&self, key: &str) -> Option<String> {
+        horizon_client::lang::has(key).then(|| horizon_client::lang::get(key))
+    }
+}

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

@@ -24,6 +24,8 @@ pub(super) struct Social {
     names: HashMap<u128, String>,
     page: Page,
     pub(super) search: EditBox,
+    /// `PlayerEntry.TOOLTIP_DELAY`: the row buttons' tooltips wait 500 ms.
+    tooltip: social_screen::TooltipDelay,
     pub(super) scroll: f32,
     /// Opened from the pause menu: Done goes back there.
     from_pause: bool,
@@ -38,6 +40,7 @@ impl Default for Social {
             names: HashMap::new(),
             page: Page::All,
             search,
+            tooltip: Default::default(),
             scroll: 0.0,
             from_pause: false,
         }
@@ -77,6 +80,7 @@ impl Game<'_> {
         self.hide_social_tutorial();
         self.social.page = Page::All;
         self.social.search.set_value("");
+        self.social.tooltip = Default::default();
         self.social.scroll = 0.0;
         self.social.from_pause = from_pause;
         self.screen = Screen::Social;
@@ -150,7 +154,7 @@ 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.last_server.address()) {
+        match (&self.integrated, self.server_address()) {
             (Some(server), _) => server.world_name.clone(),
             (None, Some(address)) if self.remote.is_some() => address.to_owned(),
             _ => self.level.name.clone(),
@@ -168,6 +172,7 @@ impl Game<'_> {
             self.cursor,
             &view,
             &mut self.social.search,
+            &mut self.social.tooltip,
             true,
         );
     }

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

@@ -261,8 +261,6 @@ 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;
     }
 
@@ -515,7 +513,7 @@ impl<'a> Split<'a> {
         if self.host.integrated.is_some() || self.host.remote.is_none() {
             return None;
         }
-        self.host.last_server.address().map(str::to_owned)
+        self.host.server_address().map(str::to_owned)
     }
 
     /// The pads' players who accepted, and the testing players (`HORIZON_SPLIT`, one a frame),