State per world, damage saved, /airdef import

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -65,6 +65,9 @@ CI: `.gitea/workflows/build.yml` на каждый пуш собирает мо
 Радар игрока и мониторы показывают только то, что держат РЛС; в сводке видно «Вне видимости РЛС: N».
 Мёртвые зоны — ближе минимальной дальности ракет (Patriot 10 м, Панцирь 25, С-400 30, С-500 40).
 
+**Сохранение.** Комплексы, объекты, их повреждения и настройки сохраняются отдельно для каждого мира (и для каждого
+сервера); уничтоженный комплекс остаётся остовом и после перезахода, пока его не отремонтируют.
+
 **Повреждения.** Взрыв рядом с комплексом повреждает его: он хуже поворачивается, хуже видит и попадает,
 дымит, ниже 35% горит. Уничтоженный остаётся горящим остовом, его боекомплект детонирует: чем больше ракет
 оставалось, тем мощнее взрыв и дольше вторичные (у Гепарда рвутся снаряды); соседние комплексы тоже могут
@@ -105,6 +108,7 @@ CI: `.gitea/workflows/build.yml` на каждый пуш собирает мо
 Команды:
 - `/airdef wave <тип> [кол-во] [дальность]` — налёт на ближайшую цель. Типы: `shahed`, `geran3`, `lancet`, `gerbera`, `kh101`, `kalibr`, `kh22`, `zircon`, `iskander`, `kinzhal`, `oreshnik` и `mix` (комбинированный удар двумя секторами: «Герберы», шахеды, Герани-3, Х-101, «Калибры», Х-22, Циркон, «Искандер», «Кинжал», при 30+ — «Орешник»);
 - `/airdef replay [map|full|reel|stop]` — повтор последнего налёта;
+- `/airdef import` — перенести в текущий мир комплексы и цели из старой версии мода (до 0.2.x они были общими для всех миров);
 - `/airdef raid` — налёт, настроенный в меню; `/airdef target here` — отметить объект под ногами; `/airdef repair` — ремонт;
 - `/airdef roles` — показать, по каким классам целей работает каждый комплекс; `/airdef roles <patriot|gepard|pantsir|s400|s500|all> <классы|default>` — задать (классы через запятую: `drone`, `jet`, `cruise`, `supersonic`, `ballistic` или `all`), например `/airdef roles s400 cruise,ballistic`;
 - `/airdef deploy <patriot|gepard|pantsir|s400|s500>` — поставить комплекс в 8 блоках перед собой;

airdef-mod/src/lib.rs

@@ -58,6 +58,10 @@ struct AirDef {
     replay: Option<replay::Player>,
     /// The world drawn beyond the render distance (replays and cameras see far off).
     far: bool,
+    /// The world whose state is loaded (`game.world-id`), once one is.
+    world: Option<Option<String>>,
+    /// The systems' and objects' health as last saved, to save again when it changes.
+    health_mark: u64,
     /// The menu's page while it is open.
     menu: Option<Page>,
     /// Where the player is, for the sounds' delay and far variants.
@@ -362,14 +366,18 @@ impl AirDef {
         for (kind, roles) in &self.sim.roles {
             text += &format!("roles {} {}\n", kind.key(), roles);
         }
-        if let Err(e) = storage::set("state", text.as_bytes()) {
+        if let Err(e) = storage::set(&self.state_key(), text.as_bytes()) {
             horizon_mod_sdk::warn(&format!("could not save: {e}"));
         }
         self.dirty = false;
     }
 
     fn load(&mut self) {
-        let Some(bytes) = storage::get("state") else { return };
+        self.load_from(&self.state_key());
+    }
+
+    fn load_from(&mut self, key: &str) {
+        let Some(bytes) = storage::get(key) else { return };
         let text = String::from_utf8_lossy(&bytes);
         for line in text.lines() {
             let w: Vec<&str> = line.split_whitespace().collect();
@@ -417,6 +425,42 @@ impl AirDef {
 }
 
 impl AirDef {
+    /// Where the open world's state is kept: a key of its own per world.
+    fn state_key(&self) -> String {
+        match self.world.as_ref().and_then(|w| w.as_ref()) {
+            Some(w) => {
+                // FNV-1a: storage keys are short, lowercase and plain.
+                let h = w.bytes().fold(0xcbf2_9ce4_8422_2325u64, |h, b| (h ^ b as u64).wrapping_mul(0x100_0000_01b3));
+                format!("state-{h:016x}")
+            }
+            None => "state".into(),
+        }
+    }
+
+    /// Another world opened: the last one's state saved, a clean simulation with this one's loaded.
+    fn open_world(&mut self, world: Option<String>) {
+        if self.world.is_some() && self.dirty {
+            self.save();
+        }
+        if self.replay.is_some() {
+            self.stop_replay();
+        }
+        let shader = self.sim.shader;
+        let seed = game::get_clock().map_or(0x5eed, |c| c.game_time.wrapping_mul(2654435761) ^ 0x9e37);
+        self.sim = Sim::new(seed);
+        self.sim.shader = shader;
+        self.ground = Ground::default();
+        self.monitor = None;
+        self.grid = false;
+        self.grid_ids.clear();
+        self.far = true;
+        self.world = Some(world);
+        self.load();
+        self.apply_far();
+        self.dirty = false;
+        self.health_mark = 0;
+    }
+
     /// Distant terrain (48 chunks, coarse) while `far` is on: the raid's whole area has land,
     /// in the world and in the cameras.
     fn apply_far(&self) {
@@ -640,7 +684,7 @@ impl AirDef {
     }
 }
 
-const HELP: &str = "/airdef menu | monitor | grid | replay [map|full|reel|stop] | raid | repair | target here | give | deploy <комплекс> | wave <тип|mix> [кол-во] [дальность] | clear | targets clear | damage on|off | shader on|off | hold on|off | roles [комплекс классы] | stats";
+const HELP: &str = "/airdef menu | monitor | grid | replay [map|full|reel|stop] | raid | repair | import | target here | give | deploy <комплекс> | wave <тип|mix> [кол-во] [дальность] | clear | targets clear | damage on|off | shader on|off | hold on|off | roles [комплекс классы] | stats";
 
 impl Mod for AirDef {
     fn init() -> Result<(Self, Registration), String> {
@@ -657,6 +701,8 @@ impl Mod for AirDef {
             wave: wave::WaveConfig::default(),
             replay: None,
             far: true,
+            world: None,
+            health_mark: 0,
             menu: None,
             listener: DVec3::ZERO,
             pending: Vec::new(),
@@ -673,7 +719,6 @@ impl Mod for AirDef {
         // Not Enter: it opens the chat.
         let _ = input::register_key("rp_pause", "Повтор: пауза", "key.keyboard.space");
         let _ = input::register_key("rp_exit", "Повтор: выход", "key.keyboard.backspace");
-        me.load();
         input::claim_items(&ITEMS.map(String::from));
         render::set_post(include_str!("../shaders/effects.wgsl"));
         me.sim.shader = true;
@@ -683,6 +728,11 @@ impl Mod for AirDef {
 
     fn tick(&mut self, _tick: u64) {
         let Some(p) = player() else { return };
+        // Each world keeps its own systems, objects and settings: loaded when it opens.
+        let world = game::world_id();
+        if self.world.as_ref() != Some(&world) {
+            self.open_world(world);
+        }
         for event in input::poll() {
             match event {
                 Event::UseStart(u) => self.use_item(&u.item.id),
@@ -779,6 +829,18 @@ impl Mod for AirDef {
                 }
             }
         }
+        // Damage is saved too: a destroyed system stays destroyed.
+        let mark = self
+            .sim
+            .sams
+            .iter()
+            .map(|s| (s.health * 1000.0) as u64)
+            .chain(self.sim.target_health.iter().map(|h| (h * 10.0) as u64))
+            .fold(self.sim.sams.len() as u64, |a, h| a.wrapping_mul(31).wrapping_add(h));
+        if mark != self.health_mark {
+            self.health_mark = mark;
+            self.dirty = true;
+        }
         if self.dirty {
             self.save();
         }
@@ -988,6 +1050,13 @@ impl Mod for AirDef {
                 self.launch_wave(&mut out)?;
                 None
             }
+            ["import"] => {
+                // The state the mod kept before worlds had their own: brought into this world.
+                let before = self.sim.sams.len();
+                self.load_from("state");
+                self.dirty = true;
+                Some(format!("Перенесено комплексов из старой версии: {}", self.sim.sams.len() - before))
+            }
             ["repair"] => {
                 let n = self.sim.repair();
                 self.dirty = true;

horizon-patches/0001-Mod-API-AirDef-fork-world-models-client-particles-so.patch

@@ -1,7 +1,7 @@
 From 3de7a6875140a107e28563cc44489b55f5794517 Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 12:37:45 +0300
-Subject: [PATCH 1/8] Mod API (AirDef fork): world models, client particles,
+Subject: [PATCH 1/9] Mod API (AirDef fork): world models, client particles,
  sounds, ground heights
 
 render.set-models draws block models with an interpolated pose per id;

horizon-patches/0002-cargo-horizon-mod-report-particles-and-sounds.patch

@@ -1,7 +1,7 @@
 From a6d64e6415bf618539af464e521091e72b72d72f Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 12:39:45 +0300
-Subject: [PATCH 2/8] cargo-horizon-mod: report particles and sounds
+Subject: [PATCH 2/9] cargo-horizon-mod: report particles and sounds
 
 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 ---

horizon-patches/0003-Mod-API-AirDef-fork-full-screen-post-pass-for-mods.patch

@@ -1,7 +1,7 @@
 From ee79b3562feebe51959a01f1585a9e85bd53ccb5 Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 13:33:10 +0300
-Subject: [PATCH 3/8] Mod API (AirDef fork): full-screen post pass for mods
+Subject: [PATCH 3/9] Mod API (AirDef fork): full-screen post pass for mods
 
 render.set-post compiles a mod's WGSL after a prelude (camera matrices,
 time, 256 vec4 of params, the world's colour and depth) and runs it after

horizon-patches/0004-Mod-models-draw-far-models-as-scaled-impostors-past-.patch

@@ -1,7 +1,7 @@
 From 2b137dbbedd540daeebc7f5e387847aeb56a1355 Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 22:09:30 +0300
-Subject: [PATCH 4/8] Mod models: draw far models as scaled impostors past the
+Subject: [PATCH 4/9] Mod models: draw far models as scaled impostors past the
  far plane, cull at 4096
 
 ---

horizon-patches/0005-Mod-cameras-render.set-views-draws-the-world-from-ot.patch

@@ -1,7 +1,7 @@
 From c8ebca6e0af68630e65211844b34d25c5b985c03 Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 22:31:00 +0300
-Subject: [PATCH 5/8] Mod cameras: render.set-views draws the world from other
+Subject: [PATCH 5/9] Mod cameras: render.set-views draws the world from other
  points into pictures that HUD view shapes show (API level 9)
 
 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

horizon-patches/0006-Mods-more-fuel-per-tick-and-per-event-AirDef-plans-r.patch

@@ -1,7 +1,7 @@
 From 8d2261fc4f8072c32e454139cfea7a8c0cd9d664 Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 23:08:21 +0300
-Subject: [PATCH 6/8] Mods: more fuel per tick and per event (AirDef plans
+Subject: [PATCH 6/9] Mods: more fuel per tick and per event (AirDef plans
  raids)
 
 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

horizon-patches/0007-Mod-cameras-up-to-1920x1080-full-screen-replays.patch

@@ -1,7 +1,7 @@
 From 6c548de34def8e4a624d734243418090798bd16a Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Wed, 28 Oct 2026 23:25:29 +0300
-Subject: [PATCH 7/8] Mod cameras up to 1920x1080 (full-screen replays)
+Subject: [PATCH 7/9] Mod cameras up to 1920x1080 (full-screen replays)
 
 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
 ---

horizon-patches/0008-Mod-cameras-distant-terrain-tiles-fog-measured-from-.patch

@@ -1,7 +1,7 @@
 From 9b9e93269d67401cc620567a884d5ce97f68d76e Mon Sep 17 00:00:00 2001
 From: chexit <chexit@duck.com>
 Date: Thu, 29 Oct 2026 11:15:11 +0300
-Subject: [PATCH 8/8] Mod cameras: distant terrain tiles, fog measured from the
+Subject: [PATCH 8/9] Mod cameras: distant terrain tiles, fog measured from the
  camera, no impostors while one is shown
 
 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

horizon-patches/0009-Mods-game.world-id-so-mods-keep-state-per-world-API-.patch

@@ -0,0 +1,126 @@
+From 065d9fa02966238a5bd9ff460392a1a809db0b11 Mon Sep 17 00:00:00 2001
+From: chexit <chexit@duck.com>
+Date: Thu, 29 Oct 2026 11:25:45 +0300
+Subject: [PATCH 9/9] Mods: game.world-id, so mods keep state per world (API
+ level 9)
+
+Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
+---
+ crates/horizon-client/src/game.rs        | 1 +
+ crates/horizon-client/src/game/mods.rs   | 3 +++
+ crates/horizon-client/src/game/remote.rs | 4 ++++
+ crates/horizon-mod-sdk/wit/horizon.wit   | 4 ++++
+ crates/horizon-mods/src/api_level.rs     | 3 ++-
+ crates/horizon-mods/src/runtime.rs       | 5 +++++
+ 6 files changed, 19 insertions(+), 1 deletion(-)
+
+diff --git a/crates/horizon-client/src/game.rs b/crates/horizon-client/src/game.rs
+index e5ffb30c4..c6b642345 100644
+--- a/crates/horizon-client/src/game.rs
++++ b/crates/horizon-client/src/game.rs
+@@ -8918,6 +8918,7 @@ impl Game<'_> {
+         create: Option<&horizon_client::title::WorldOptions>,
+     ) -> Result<()> {
+         world_loading::world_data_used();
++        self.mods.world_id = Some(format!("world:{folder}"));
+         if self.defer_world_entry(PendingWorldEntry::Local {
+             folder: folder.to_owned(),
+             name: name.map(str::to_owned),
+diff --git a/crates/horizon-client/src/game/mods.rs b/crates/horizon-client/src/game/mods.rs
+index 3eef96aa3..ebdd18a24 100644
+--- a/crates/horizon-client/src/game/mods.rs
++++ b/crates/horizon-client/src/game/mods.rs
+@@ -38,6 +38,8 @@ use {
+ 
+ #[derive(Default)]
+ pub(super) struct ModsState {
++    /// The open world, for `game.world-id` (AirDef fork): its folder, or the server's address.
++    pub(super) world_id: Option<String>,
+     #[cfg(feature = "mods")]
+     pub(super) mods: Mods,
+     /// Capability `input`: a claimed item's use while the button is down.
+@@ -482,6 +484,7 @@ impl Game<'_> {
+             known_recipes,
+             placing: self.mod_recipe_screen(),
+             creative: self.creative,
++            world: self.player.is_some().then(|| self.mods.world_id.clone()).flatten(),
+         }
+     }
+     /// The first block along the player's view within
+diff --git a/crates/horizon-client/src/game/remote.rs b/crates/horizon-client/src/game/remote.rs
+index 22b7c13df..89df0616b 100644
+--- a/crates/horizon-client/src/game/remote.rs
++++ b/crates/horizon-client/src/game/remote.rs
+@@ -342,6 +342,10 @@ impl Game<'_> {
+         cookies: Option<horizon_client::net::Cookies>,
+     ) -> Result<()> {
+         self.perf.world_opening();
++        // A server's own world; joining the world this window hosts keeps its folder.
++        if local.is_none() {
++            self.mods.world_id = Some(format!("server:{address}"));
++        }
+         let root = self.options.resources.clone();
+         let builtin = Builtin::find(&root)
+             .and_then(|p| Builtin::load(&p).ok())
+diff --git a/crates/horizon-mod-sdk/wit/horizon.wit b/crates/horizon-mod-sdk/wit/horizon.wit
+index e30f3a30e..b6758d9fb 100644
+--- a/crates/horizon-mod-sdk/wit/horizon.wit
++++ b/crates/horizon-mod-sdk/wit/horizon.wit
+@@ -47,6 +47,10 @@ interface game {
+     get-player: func() -> option<player>;
+     /// None on the title screen.
+     get-clock: func() -> option<clock>;
++    /// Which world is open (AirDef fork): `world:<folder>` for a saved
++    /// world, `server:<address>` on a server; none on the title screen.
++    /// Mods keep their state apart by it.
++    world-id: func() -> option<string>;
+     /// A block along the player's view.
+     record hit {
+         /// The block hit.
+diff --git a/crates/horizon-mods/src/api_level.rs b/crates/horizon-mods/src/api_level.rs
+index 9d15851b4..cf2993186 100644
+--- a/crates/horizon-mods/src/api_level.rs
++++ b/crates/horizon-mods/src/api_level.rs
+@@ -13,7 +13,7 @@ pub const LEVEL: u32 = 9;
+ /// level. Level 0 is the contract of Horizon 0.2.67 to 0.2.69. A new
+ /// function takes the next level and raises [`LEVEL`] (the `api_reference`
+ /// test fails until it is listed here).
+-pub const FUNCTIONS: [(&str, u32); 55] = [
++pub const FUNCTIONS: [(&str, u32); 56] = [
+     ("log.write", 0),
+     ("game.get-player", 0),
+     ("game.get-clock", 0),
+@@ -70,6 +70,7 @@ pub const FUNCTIONS: [(&str, u32); 55] = [
+     ("render.clear-post", 8),
+     ("render.set-params", 8),
+     ("render.set-views", 9),
++    ("game.world-id", 9),
+ ];
+ 
+ /// What the game's program carries so the launcher can read its level
+diff --git a/crates/horizon-mods/src/runtime.rs b/crates/horizon-mods/src/runtime.rs
+index 1389407be..abed5b31f 100644
+--- a/crates/horizon-mods/src/runtime.rs
++++ b/crates/horizon-mods/src/runtime.rs
+@@ -168,6 +168,8 @@ pub struct Snapshot {
+     pub placing: bool,
+     /// The player is in creative mode (`recipes.give`).
+     pub creative: bool,
++    /// The open world (`game.world-id`, AirDef fork).
++    pub world: Option<String>,
+ }
+ 
+ /// Capability `recipes`'s tables: `items` in the registry's order, which
+@@ -1475,6 +1477,9 @@ impl game::Host for State {
+     fn get_clock(&mut self) -> Option<Clock> {
+         self.snapshot.clock
+     }
++    fn world_id(&mut self) -> Option<String> {
++        self.snapshot.world.clone()
++    }
+     fn raycast(&mut self, distance: f32) -> Option<Hit> {
+         let (at, hit) = self.snapshot.view_hit.as_ref()?;
+         // NaN compares false: no hit.
+-- 
+2.54.0 (Apple Git-157)
+