Bind player health and combat to live attribute storage

benchmarks/rust-live-player-combat-2026-10-07/scoped-parity.json

@@ -0,0 +1,315 @@
+{
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+  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
+  "java": "openjdk 25.0.4.1 2026-08-18",
+  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)",
+  "fixtures": 7465,
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+    "crates/horizon-world/src/worldgen/placement/context.rs": "a278304795136677ad4b4933ea50c972b9729a1c671c03fa309c193e224b1fd6",
+    "crates/horizon-world/src/worldgen/placement/layer.rs": "a0f5ca776f33f9d4f72b8fdcd163426152e5e43cb4a7572fc1d4fc57bf965de1",
+    "crates/horizon-world/src/worldgen/placement.rs": "b0397e5818fae84358546193a95f84bcb0b5bffafce909e6fcb3386179ee8023",
+    "crates/horizon-world/src/worldgen/replace_blobs.rs": "bf3377d86d2570cd15288ba69dde64a2cf67c5bcbb9a31d0c23421964af74afa",
+    "crates/horizon-world/src/worldgen/router.rs": "2cee7cf15a0d2ada12be6b39d83e78177fd3033922e4f4cce87a64073cec2847",
+    "crates/horizon-world/src/worldgen/rule_test.rs": "d1662ec492489ebaa4b87e20f9a8c809dcf3a223a151211bd65ec241a63692fc",
+    "crates/horizon-world/src/worldgen/settings.rs": "a8fe87752e1982ef11cb67f8d80d8e3428b2c27db178044cb425ba803e689e59",
+    "crates/horizon-world/src/worldgen/simple_block.rs": "9ba1a88d5db4925f8c37366557887f776c805f9a6444781615b5dbaff52e92a4",
+    "crates/horizon-world/src/worldgen/snow_freeze.rs": "9040be3d5c7f8f0fd812d2df45e154bf8a9eeef038530b83fa4159d246eac35f",
+    "crates/horizon-world/src/worldgen/speleothem.rs": "c71651c1c97818a8a85863e14414d6139ea3bdeb897fa422043bcc1499d99aae",
+    "crates/horizon-world/src/worldgen/spike.rs": "eacf0d9d3d2bc3d4bcf62bc87555f90031138236a5bfef0eb5270204f7c2a4fc",
+    "crates/horizon-world/src/worldgen/spring.rs": "830849e9b89fcdf09e9b06fbefdcdebe3c8c3f82804f60b8bd5de04ba303cb62",
+    "crates/horizon-world/src/worldgen/state_provider/catalog.rs": "c8687e15a4887a9200c8d365857d801efaa8f90e669eee3e600a1db4905119eb",
+    "crates/horizon-world/src/worldgen/state_provider/noise.rs": "7ee369c2a032e5620cb9bdf9ee7adad1f70870fb0a27efb7b7c514d92f83491f",
+    "crates/horizon-world/src/worldgen/state_provider/properties.rs": "9909139aaca1dc4f743957257fadaa9d423d21fa401fa9abc050505f79365139",
+    "crates/horizon-world/src/worldgen/state_provider.rs": "be29ada818826a90afe01ab60916360fdfc4cbde5af15c9359cd56b1f1f7b156",
+    "crates/horizon-world/src/worldgen/tags.rs": "74e4110fb19c4c4047192fd65c38015b8afc7f9fc50404d75380b5063808148c",
+    "crates/horizon-world/src/worldgen/terrain.rs": "fd1f2e0afc15daf66f484ea40a1f2b7013650bda0941b23c64c81ee9f79cb673",
+    "crates/horizon-world/src/worldgen/underwater_magma.rs": "7317e40af5ee5a9780f90ce358fa5d3e7f5b3d513b731df6ff97754d9c2a0154",
+    "crates/horizon-world/src/worldgen/value_provider.rs": "3358b563db8cb0bc8a9cfbbe2b8b3e70941cd2d37a0b519fbb6545f8d0dcbb69",
+    "crates/horizon-world/src/worldgen/vines.rs": "ee9b79b65012bd86a838241d2ef708680f7fe8eafc8aa656dae9cf2abf3c6418",
+    "crates/horizon-world/src/worldgen/weighted.rs": "839840aae25302933bbd97a81a2336330e2d03a0ad1684e1e16ac769ed408e6b",
+    "crates/horizon-world/src/worldgen/write_zone.rs": "8e17a179764d3f68c05882aef35f6810c28a0000f9a83e58bd6030660b76e64e",
+    "crates/horizon-world/src/worldgen.rs": "e8e9f099ee1fcec8eedce31805d676d3f89c18e84f494a147ffcbfee23d3d54f",
+    "crates/horizon-world/examples/server_player_combat_fixture.rs": "243ddd24d91337c07526b586a92e183c0524f584612e5a4ab304fa489b7a7082"
+  },
+  "fixtures_sha256": {
+    ".local/rust-server-player-combat-parity/inputs.txt": "0267042ca199aba2647667b349b22be374c83fbae3d9846a33519c1f96a402b4",
+    ".local/rust-server-player-combat-parity/catalog.json": "d1e488e4f432888beb9f643904c8bca242d1e2093f53e23e07da305d70cf7106",
+    ".local/rust-server-player-combat-parity/ids.json": "f7d6037166d966e2714b01cff5626f0cc0a02ce883885ec791c93e977afde0e6",
+    ".local/rust-server-player-combat-parity/slots.json": "29101ebf1ead685029508789eee51c4d4fff65524064d8e32a48efded7036982",
+    ".local/rust-server-player-combat-parity/head.json": "ef2d127de37b942baad06145e54b0c619a1f22327b2ebbcfbec78f5564afe39d"
+  },
+  "rust_output_sha256": "e2e937abc1e00904c23573390279fb6f7474b88e0adf8ebb0f0019504e888939",
+  "live_rust_output_sha256": "e2e937abc1e00904c23573390279fb6f7474b88e0adf8ebb0f0019504e888939",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "e2e937abc1e00904c23573390279fb6f7474b88e0adf8ebb0f0019504e888939",
+      "matched_output_lines": 1176994
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "e2e937abc1e00904c23573390279fb6f7474b88e0adf8ebb0f0019504e888939",
+      "matched_output_lines": 1176994
+    }
+  ],
+  "scope": "Both EntityAttributes and LiveAttributes storage bindings produce the same native traces. Actual ServerPlayer outer hurt through Player/LivingEntity gates and actual Player inner damage, native armor/resistance reduction, registered modified attributes, synchronized health/absorption and FoodData exhaustion. Repeated hits, cooldown/state writes, death rejection, callbacks and numeric edges. Actual inherited invulnerability predicates include virtual flags, empty-equipment enchantment immunity, damage gamerules and client-loading/dimension guards; blocking amount, durability, effects, PvP permission, attribution, knockback, death services and criterion listeners remain controlled; enchanted items, registered sources and complete entity/game lifecycle remain pending."
+}

crates/horizon-world/examples/server_player_combat_fixture.rs

@@ -1,9 +1,11 @@
 use horizon_world::damage_immunity::{DamageRule, ImmunityTag, ImmunityWorld};
 use horizon_world::living_hurt::{HurtState, HurtTag, HurtWorld};
 use horizon_world::{
+    attribute_health::HealthAttributes,
     attributes::{
         Modifier, Operation,
         entity::{Catalog, EntityAttributes},
+        live::LiveAttributes,
     },
     combat_rules::ArmorWorld,
     damage_reduction::Bypass,
@@ -25,6 +27,60 @@ use std::{
     io::{self, Write},
     path::Path,
 };
+// Run the identical native combat corpus through both attribute stores.
+trait FixtureAttributes: HealthAttributes {
+    fn create(catalog: Arc<Catalog>) -> Self;
+    fn configure(&mut self, name: &str, base: f64, modifier: Option<Modifier>);
+}
+impl FixtureAttributes for EntityAttributes {
+    fn create(catalog: Arc<Catalog>) -> Self {
+        catalog.create("minecraft:player").unwrap()
+    }
+    fn configure(&mut self, name: &str, base: f64, modifier: Option<Modifier>) {
+        let key = self.catalog().id(name).unwrap();
+        self.edit(key, |a, o| {
+            a.set_base_value(base, o)?;
+            if let Some(m) = modifier {
+                a.add_transient(m, o)?;
+            }
+            Ok::<_, horizon_world::attributes::AttributeError<std::convert::Infallible>>(())
+        })
+        .unwrap()
+        .unwrap();
+    }
+}
+type Live = LiveAttributes<Box<dyn FnMut() -> i32>>;
+impl FixtureAttributes for Live {
+    fn create(catalog: Arc<Catalog>) -> Self {
+        let hashes: Vec<_> = catalog
+            .attributes()
+            .enumerate()
+            .map(|(i, _)| i as i32)
+            .collect();
+        let mut next = 0i32;
+        Self::new(
+            catalog,
+            "minecraft:player",
+            &hashes,
+            Box::new(move || {
+                next = next.wrapping_add(1);
+                next
+            }),
+        )
+        .unwrap()
+    }
+    fn configure(&mut self, name: &str, base: f64, modifier: Option<Modifier>) {
+        let handle = self.get_instance(self.key(name)).unwrap().unwrap();
+        self.edit(&handle, |a, o| {
+            a.set_base_value(base, o)?;
+            if let Some(m) = modifier {
+                a.add_transient(m, o)?;
+            }
+            Ok(())
+        })
+        .unwrap();
+    }
+}
 fn single(v: &Value) -> f32 {
     f32::from_bits(u32::from_str_radix(v.as_str().unwrap(), 16).unwrap())
 }
@@ -320,7 +376,7 @@ impl ArmorWorld for Env<'_> {
         Ok(v)
     }
 }
-impl ServerDamageEnvironment for Env<'_> {
+impl<A: FixtureAttributes> ServerDamageEnvironment<A> for Env<'_> {
     type Attacker = ();
     fn invulnerable(&mut self) -> io::Result<bool> {
         self.event("invulnerable")?;
@@ -336,15 +392,10 @@ impl ServerDamageEnvironment for Env<'_> {
         self.event(&format!("tag bypass_{n}"))?;
         Ok(self.flag(&format!("bypass_{n}")))
     }
-    fn hurt_armor(&mut self, a: &mut EntityAttributes, v: f32) -> io::Result<()> {
+    fn hurt_armor(&mut self, a: &mut A, v: f32) -> io::Result<()> {
         self.event(&format!("hurt-armor {:08x}", bits(v)))?;
         if self.flag("break_armor") {
-            let id = a.catalog().id("minecraft:armor").unwrap();
-            a.edit(id, |a, o| {
-                a.set_base_value(number(&self.op["armor_after"]), o)
-            })
-            .unwrap()
-            .unwrap();
+            a.configure("minecraft:armor", number(&self.op["armor_after"]), None);
         }
         Ok(())
     }
@@ -405,7 +456,7 @@ impl ServerDamageEnvironment for Env<'_> {
         self.event("damage-event")
     }
 }
-impl CombatEnvironment for Env<'_> {
+impl<A: FixtureAttributes> CombatEnvironment<A> for Env<'_> {
     fn dead_flag(&self) -> bool {
         self.dead
     }
@@ -413,6 +464,13 @@ impl CombatEnvironment for Env<'_> {
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     let arg = std::env::args().nth(1).unwrap();
     let dir = Path::new(&arg);
+    if std::env::args().nth(2).as_deref() == Some("--live") {
+        run::<Live>(dir, "rust-live.txt")
+    } else {
+        run::<EntityAttributes>(dir, "rust.txt")
+    }
+}
+fn run<A: FixtureAttributes>(dir: &Path, output: &str) -> Result<(), Box<dyn std::error::Error>> {
     let ids: Value = serde_json::from_str(&fs::read_to_string(dir.join("ids.json"))?)?;
     let ids = PlayerFloatIds {
         health: ids["health"].as_u64().unwrap() as u8,
@@ -428,12 +486,11 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         "minecraft:armor_toughness",
         "minecraft:max_health",
         "minecraft:max_absorption",
-    ]
-    .map(|k| catalog.id(k).unwrap());
-    let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
+    ];
+    let mut out = io::BufWriter::new(fs::File::create(dir.join(output))?);
     for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
         let f: Value = serde_json::from_str(line)?;
-        let mut attributes = catalog.create("minecraft:player").unwrap();
+        let mut attributes = A::create(catalog.clone());
         for (i, key) in keys.iter().enumerate() {
             let a = &f["attributes"][i];
             let m = Modifier::new(
@@ -441,13 +498,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
                 number(&a["amount"]),
                 Operation::ALL[a["operation"].as_u64().unwrap() as usize],
             )?;
-            attributes
-                .edit(*key, |a, o| {
-                    a.set_base_value(number(&f["attributes"][i]["base"]), o)?;
-                    a.add_transient(m, o)
-                })
-                .unwrap()
-                .unwrap();
+            attributes.configure(key, number(&f["attributes"][i]["base"]), Some(m));
         }
         let mut data = SyncedFloats::new(&[
             FloatValue {

crates/horizon-world/src/player_health.rs

@@ -1,7 +1,8 @@
 //! Player absorption uses virtual synchronized-data access, unlike base living
 //! absorption field storage. Health keeps its direct synchronized-data access.
 use crate::{
-    attributes::entity::{AttributeId, EntityAttributes, LookupError},
+    attribute_health::HealthAttributes,
+    attributes::entity::{EntityAttributes, LookupError},
     compression::invalid,
     living_health::{self, HealthWorld},
     synced_floats::{DataError, Observer, SyncedFloats},
@@ -29,11 +30,11 @@ pub struct PlayerFloatIds {
     pub absorption: u8,
 }
 #[derive(Debug)]
-pub enum PlayerHealthError<E> {
-    Attribute(LookupError),
+pub enum PlayerHealthError<E, A = LookupError> {
+    Attribute(A),
     Data(DataError<E>),
 }
-impl<E: fmt::Display> fmt::Display for PlayerHealthError<E> {
+impl<E: fmt::Display, A: fmt::Debug> fmt::Display for PlayerHealthError<E, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Attribute(e) => write!(f, "player health attribute lookup: {e:?}"),
@@ -41,21 +42,21 @@ impl<E: fmt::Display> fmt::Display for PlayerHealthError<E> {
         }
     }
 }
-impl<E: std::error::Error + 'static> std::error::Error for PlayerHealthError<E> {}
+impl<E: std::error::Error + 'static, A: fmt::Debug> std::error::Error for PlayerHealthError<E, A> {}
 /// Ordinary registered-player state, borrowing its actual float table. IDs come
 /// from the pinned entity-data schema; construction does not invent spawn state.
-pub struct PlayerAttributeHealth<'a, O> {
-    attributes: &'a mut EntityAttributes,
+pub struct PlayerAttributeHealth<'a, O, A: HealthAttributes = EntityAttributes> {
+    attributes: &'a mut A,
     data: &'a mut SyncedFloats,
     ids: PlayerFloatIds,
-    max_health: AttributeId,
-    max_absorption: AttributeId,
+    max_health: A::Key,
+    max_absorption: A::Key,
     dead: bool,
     observer: &'a mut O,
 }
-impl<'a, O: Observer> PlayerAttributeHealth<'a, O> {
+impl<'a, O: Observer, A: HealthAttributes> PlayerAttributeHealth<'a, O, A> {
     pub fn new(
-        attributes: &'a mut EntityAttributes,
+        attributes: &'a mut A,
         data: &'a mut SyncedFloats,
         ids: PlayerFloatIds,
         dead: bool,
@@ -68,12 +69,10 @@ impl<'a, O: Observer> PlayerAttributeHealth<'a, O> {
             return Err(invalid("missing or aliased player float fields"));
         }
         let max_health = attributes
-            .catalog()
-            .id("minecraft:max_health")
+            .health_attribute_key("minecraft:max_health")
             .ok_or_else(|| invalid("missing MAX_HEALTH definition"))?;
         let max_absorption = attributes
-            .catalog()
-            .id("minecraft:max_absorption")
+            .health_attribute_key("minecraft:max_absorption")
             .ok_or_else(|| invalid("missing MAX_ABSORPTION definition"))?;
         Ok(Self {
             attributes,
@@ -85,27 +84,30 @@ impl<'a, O: Observer> PlayerAttributeHealth<'a, O> {
             observer,
         })
     }
-    pub fn heal(&mut self, amount: f32) -> Result<(), PlayerHealthError<O::Error>> {
+    pub fn heal(&mut self, amount: f32) -> Result<(), PlayerHealthError<O::Error, A::Error>> {
         living_health::heal(self, amount)
     }
-    pub fn set_health(&mut self, value: f32) -> Result<(), PlayerHealthError<O::Error>> {
+    pub fn set_health(&mut self, value: f32) -> Result<(), PlayerHealthError<O::Error, A::Error>> {
         living_health::set_health(self, value)
     }
-    pub fn set_absorption(&mut self, value: f32) -> Result<(), PlayerHealthError<O::Error>> {
+    pub fn set_absorption(
+        &mut self,
+        value: f32,
+    ) -> Result<(), PlayerHealthError<O::Error, A::Error>> {
         living_health::set_absorption(self, value)
     }
-    pub fn absorption(&mut self) -> Result<f32, PlayerHealthError<O::Error>> {
+    pub fn absorption(&mut self) -> Result<f32, PlayerHealthError<O::Error, A::Error>> {
         absorption(self)
     }
-    pub fn is_hurt(&mut self) -> Result<bool, PlayerHealthError<O::Error>> {
+    pub fn is_hurt(&mut self) -> Result<bool, PlayerHealthError<O::Error, A::Error>> {
         living_health::is_hurt(self)
     }
-    pub fn is_dead_or_dying(&mut self) -> Result<bool, PlayerHealthError<O::Error>> {
+    pub fn is_dead_or_dying(&mut self) -> Result<bool, PlayerHealthError<O::Error, A::Error>> {
         living_health::is_dead_or_dying(self)
     }
 }
-impl<O: Observer> HealthWorld for PlayerAttributeHealth<'_, O> {
-    type Error = PlayerHealthError<O::Error>;
+impl<O: Observer, A: HealthAttributes> HealthWorld for PlayerAttributeHealth<'_, O, A> {
+    type Error = PlayerHealthError<O::Error, A::Error>;
     type Data = ();
     fn health(&mut self) -> Result<f32, Self::Error> {
         self.data
@@ -115,12 +117,12 @@ impl<O: Observer> HealthWorld for PlayerAttributeHealth<'_, O> {
     fn health_data(&self) {}
     fn max_health_attribute(&mut self) -> Result<f64, Self::Error> {
         self.attributes
-            .value(self.max_health)
+            .health_attribute_value(self.max_health.clone())
             .map_err(PlayerHealthError::Attribute)
     }
     fn max_absorption_attribute(&mut self) -> Result<f64, Self::Error> {
         self.attributes
-            .value(self.max_absorption)
+            .health_attribute_value(self.max_absorption.clone())
             .map_err(PlayerHealthError::Attribute)
     }
     fn store_health(&mut self, _: (), value: f32) -> Result<(), Self::Error> {
@@ -138,7 +140,7 @@ impl<O: Observer> HealthWorld for PlayerAttributeHealth<'_, O> {
         living_health::set_health(self, value)
     }
 }
-impl<O: Observer> PlayerHealthWorld for PlayerAttributeHealth<'_, O> {
+impl<O: Observer, A: HealthAttributes> PlayerHealthWorld for PlayerAttributeHealth<'_, O, A> {
     fn entity_data(&mut self) -> Result<(), Self::Error> {
         Ok(())
     }

crates/horizon-world/src/server_player_combat.rs

@@ -1,5 +1,6 @@
 //! Server-player outer hurt composed with registered attributes and player storage.
 use crate::{
+    attribute_health::HealthAttributes,
     attributes::entity::EntityAttributes,
     combat_rules::ArmorWorld,
     damage_immunity::{self, ImmunityWorld},
@@ -14,24 +15,24 @@ use crate::{
 };
 use std::io;
 type Error<E> = <E as ArmorWorld>::Error;
-pub trait CombatEnvironment:
-    ServerDamageEnvironment
+pub trait CombatEnvironment<A: HealthAttributes = EntityAttributes>:
+    ServerDamageEnvironment<A>
     + ServerPlayerHurtWorld<Error = <Self as ArmorWorld>::Error>
     + ImmunityWorld<Error = <Self as ArmorWorld>::Error>
 {
     /// Direct death flag, read only after health fails the native <= zero test.
     fn dead_flag(&self) -> bool;
 }
-pub struct ServerPlayerCombat<'a, E> {
-    attributes: &'a mut EntityAttributes,
+pub struct ServerPlayerCombat<'a, E, A: HealthAttributes = EntityAttributes> {
+    attributes: &'a mut A,
     data: &'a mut SyncedFloats,
     food: &'a mut FoodData,
     ids: PlayerFloatIds,
     environment: &'a mut E,
 }
-impl<'a, E: CombatEnvironment> ServerPlayerCombat<'a, E> {
+impl<'a, A: HealthAttributes, E: CombatEnvironment<A>> ServerPlayerCombat<'a, E, A> {
     pub fn new(
-        attributes: &'a mut EntityAttributes,
+        attributes: &'a mut A,
         data: &'a mut SyncedFloats,
         food: &'a mut FoodData,
         ids: PlayerFloatIds,
@@ -50,12 +51,12 @@ impl<'a, E: CombatEnvironment> ServerPlayerCombat<'a, E> {
         &mut self,
         state: &mut HurtState<E::Source>,
         damage: f32,
-    ) -> Result<bool, ServerDamageError<Error<E>>> {
+    ) -> Result<bool, ServerDamageError<Error<E>, A::Error>> {
         server_player_hurt_server(state, self, damage)
     }
 }
-impl<E: CombatEnvironment> HurtWorld for ServerPlayerCombat<'_, E> {
-    type Error = ServerDamageError<Error<E>>;
+impl<A: HealthAttributes, E: CombatEnvironment<A>> HurtWorld for ServerPlayerCombat<'_, E, A> {
+    type Error = ServerDamageError<Error<E>, A::Error>;
     type Source = E::Source;
     type UseItem = E::UseItem;
     type Blocking = E::Blocking;
@@ -249,7 +250,9 @@ impl<E: CombatEnvironment> HurtWorld for ServerPlayerCombat<'_, E> {
             .map_err(ServerDamageError::Environment)
     }
 }
-impl<E: CombatEnvironment> PlayerHurtWorld for ServerPlayerCombat<'_, E> {
+impl<A: HealthAttributes, E: CombatEnvironment<A>> PlayerHurtWorld
+    for ServerPlayerCombat<'_, E, A>
+{
     fn ability_invulnerable(&self) -> bool {
         ServerDamageEnvironment::ability_invulnerable(self.environment)
     }
@@ -278,7 +281,9 @@ impl<E: CombatEnvironment> PlayerHurtWorld for ServerPlayerCombat<'_, E> {
         PlayerHurtWorld::difficulty(self.environment, state).map_err(ServerDamageError::Environment)
     }
 }
-impl<E: CombatEnvironment> ServerPlayerHurtWorld for ServerPlayerCombat<'_, E> {
+impl<A: HealthAttributes, E: CombatEnvironment<A>> ServerPlayerHurtWorld
+    for ServerPlayerCombat<'_, E, A>
+{
     type Player = E::Player;
     type Arrow = E::Arrow;
     fn causing_entity(

crates/horizon-world/src/server_player_damage.rs

@@ -2,7 +2,8 @@
 //! synchronized health/absorption and stored hunger. Outer hurt gates stay with
 //! the caller; equipment, effect, statistic and combat services stay explicit.
 use crate::{
-    attributes::entity::{AttributeId, EntityAttributes, LookupError},
+    attribute_health::HealthAttributes,
+    attributes::entity::{EntityAttributes, LookupError},
     combat_rules::ArmorWorld,
     compression::invalid,
     damage_reduction::{self, Bypass, DamageReductionWorld},
@@ -14,12 +15,12 @@ use crate::{
 use std::{fmt, io};
 type EnvError<E> = <E as ArmorWorld>::Error;
 #[derive(Debug)]
-pub enum ServerDamageError<E> {
-    Attribute(LookupError),
+pub enum ServerDamageError<E, A = LookupError> {
+    Attribute(A),
     Data(DataError<E>),
     Environment(E),
 }
-impl<E: fmt::Display> fmt::Display for ServerDamageError<E> {
+impl<E: fmt::Display, A: fmt::Debug> fmt::Display for ServerDamageError<E, A> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             Self::Attribute(e) => write!(f, "damage attribute lookup: {e:?}"),
@@ -28,14 +29,14 @@ impl<E: fmt::Display> fmt::Display for ServerDamageError<E> {
         }
     }
 }
-impl<E: std::error::Error + 'static> std::error::Error for ServerDamageError<E> {}
-fn health_error<E>(e: PlayerHealthError<E>) -> ServerDamageError<E> {
+impl<E: std::error::Error + 'static, A: fmt::Debug> std::error::Error for ServerDamageError<E, A> {}
+fn health_error<E, A>(e: PlayerHealthError<E, A>) -> ServerDamageError<E, A> {
     match e {
         PlayerHealthError::Attribute(e) => ServerDamageError::Attribute(e),
         PlayerHealthError::Data(e) => ServerDamageError::Data(e),
     }
 }
-pub trait ServerDamageEnvironment:
+pub trait ServerDamageEnvironment<A: HealthAttributes = EntityAttributes>:
     ArmorWorld + Observer<Error = <Self as ArmorWorld>::Error>
 {
     type Attacker: Copy;
@@ -43,11 +44,7 @@ pub trait ServerDamageEnvironment:
     fn bypasses(&mut self, kind: Bypass) -> Result<bool, EnvError<Self>>;
     /// Equipment breakage may update the live attribute map before armor and
     /// toughness are queried by the rest of this hit.
-    fn hurt_armor(
-        &mut self,
-        attributes: &mut EntityAttributes,
-        damage: f32,
-    ) -> Result<(), EnvError<Self>>;
+    fn hurt_armor(&mut self, attributes: &mut A, damage: f32) -> Result<(), EnvError<Self>>;
     fn has_resistance(&mut self) -> Result<bool, EnvError<Self>>;
     fn resistance_amplifier(&mut self) -> Result<i32, EnvError<Self>>;
     fn award_resisted(&mut self, amount: i32) -> Result<(), EnvError<Self>>;
@@ -67,30 +64,28 @@ pub trait ServerDamageEnvironment:
     fn record_damage(&mut self, amount: f32) -> Result<(), EnvError<Self>>;
     fn damage_event(&mut self) -> Result<(), EnvError<Self>>;
 }
-pub struct ServerPlayerDamage<'a, E> {
-    attributes: &'a mut EntityAttributes,
+pub struct ServerPlayerDamage<'a, E, A: HealthAttributes = EntityAttributes> {
+    attributes: &'a mut A,
     data: &'a mut SyncedFloats,
     food: &'a mut FoodData,
     ids: PlayerFloatIds,
-    armor: AttributeId,
-    toughness: AttributeId,
+    armor: A::Key,
+    toughness: A::Key,
     environment: &'a mut E,
 }
-impl<'a, E: ServerDamageEnvironment> ServerPlayerDamage<'a, E> {
+impl<'a, A: HealthAttributes, E: ServerDamageEnvironment<A>> ServerPlayerDamage<'a, E, A> {
     pub fn new(
-        attributes: &'a mut EntityAttributes,
+        attributes: &'a mut A,
         data: &'a mut SyncedFloats,
         food: &'a mut FoodData,
         ids: PlayerFloatIds,
         environment: &'a mut E,
     ) -> io::Result<Self> {
         let armor = attributes
-            .catalog()
-            .id("minecraft:armor")
+            .health_attribute_key("minecraft:armor")
             .ok_or_else(|| invalid("missing ARMOR definition"))?;
         let toughness = attributes
-            .catalog()
-            .id("minecraft:armor_toughness")
+            .health_attribute_key("minecraft:armor_toughness")
             .ok_or_else(|| invalid("missing ARMOR_TOUGHNESS definition"))?;
         PlayerAttributeHealth::new(attributes, data, ids, false, environment)?;
         Ok(Self {
@@ -103,7 +98,7 @@ impl<'a, E: ServerDamageEnvironment> ServerPlayerDamage<'a, E> {
             environment,
         })
     }
-    fn health_binding(&mut self) -> PlayerAttributeHealth<'_, E> {
+    fn health_binding(&mut self) -> PlayerAttributeHealth<'_, E, A> {
         PlayerAttributeHealth::new(
             self.attributes,
             self.data,
@@ -113,18 +108,20 @@ impl<'a, E: ServerDamageEnvironment> ServerPlayerDamage<'a, E> {
         )
         .expect("validated immutable player float schema")
     }
-    pub fn apply(&mut self, damage: f32) -> Result<(), ServerDamageError<EnvError<E>>> {
+    pub fn apply(&mut self, damage: f32) -> Result<(), ServerDamageError<EnvError<E>, A::Error>> {
         living_damage::actually_hurt(self, damage, true)
     }
     pub(crate) fn apply_after_immunity_check(
         &mut self,
         damage: f32,
-    ) -> Result<(), ServerDamageError<EnvError<E>>> {
+    ) -> Result<(), ServerDamageError<EnvError<E>, A::Error>> {
         living_damage::actually_hurt_after_immunity_check(self, damage, true)
     }
 }
-impl<E: ServerDamageEnvironment> ArmorWorld for ServerPlayerDamage<'_, E> {
-    type Error = ServerDamageError<EnvError<E>>;
+impl<A: HealthAttributes, E: ServerDamageEnvironment<A>> ArmorWorld
+    for ServerPlayerDamage<'_, E, A>
+{
+    type Error = ServerDamageError<EnvError<E>, A::Error>;
     type Weapon = E::Weapon;
     type ServerLevel = E::ServerLevel;
     fn weapon(&mut self) -> Result<Option<Self::Weapon>, Self::Error> {
@@ -148,7 +145,9 @@ impl<E: ServerDamageEnvironment> ArmorWorld for ServerPlayerDamage<'_, E> {
             .map_err(ServerDamageError::Environment)
     }
 }
-impl<E: ServerDamageEnvironment> DamageReductionWorld for ServerPlayerDamage<'_, E> {
+impl<A: HealthAttributes, E: ServerDamageEnvironment<A>> DamageReductionWorld
+    for ServerPlayerDamage<'_, E, A>
+{
     fn bypasses(&mut self, b: Bypass) -> Result<bool, Self::Error> {
         self.environment
             .bypasses(b)
@@ -161,13 +160,13 @@ impl<E: ServerDamageEnvironment> DamageReductionWorld for ServerPlayerDamage<'_,
     }
     fn armor_value(&mut self) -> Result<i32, Self::Error> {
         self.attributes
-            .value(self.armor)
+            .health_attribute_value(self.armor.clone())
             .map(damage_reduction::armor_from_attribute)
             .map_err(ServerDamageError::Attribute)
     }
     fn toughness_attribute(&mut self) -> Result<f64, Self::Error> {
         self.attributes
-            .value(self.toughness)
+            .health_attribute_value(self.toughness.clone())
             .map_err(ServerDamageError::Attribute)
     }
     fn has_resistance(&mut self) -> Result<bool, Self::Error> {
@@ -205,8 +204,10 @@ impl<E: ServerDamageEnvironment> DamageReductionWorld for ServerPlayerDamage<'_,
             .map_err(ServerDamageError::Environment)
     }
 }
-impl<E: ServerDamageEnvironment> DamageWorld for ServerPlayerDamage<'_, E> {
-    type Error = ServerDamageError<EnvError<E>>;
+impl<A: HealthAttributes, E: ServerDamageEnvironment<A>> DamageWorld
+    for ServerPlayerDamage<'_, E, A>
+{
+    type Error = ServerDamageError<EnvError<E>, A::Error>;
     type Attacker = E::Attacker;
     fn invulnerable(&mut self) -> Result<bool, Self::Error> {
         self.environment

docs/collision-geometry.md

@@ -2093,3 +2093,17 @@ retains **167,906 matching lines per JAR**. Targeted Clippy passes. Map-only run
 use the same installed JDK; these comparisons do not assert gameplay parity or
 equal identity hashes across processes. Keys must have pure operations; null
 keys and other unexposed Map APIs remain outside this storage subset.
+
+`PlayerAttributeHealth`, `ServerPlayerDamage` and `ServerPlayerCombat` can now
+borrow `LiveAttributes`, the same storage used by the resident moving player,
+as well as `EntityAttributes`. Health limits and armor queries use the borrowed
+store; equipment damage callbacks can update it before damage reduction reads
+armor and toughness. Player absorption retains synchronized float storage.
+
+The [live player combat comparison](../benchmarks/rust-live-player-combat-2026-10-07/scoped-parity.json)
+runs the identical corpus through both stores and matches 1,176,994 output lines
+against each pinned Java reference. It covers repeated hits, cooldowns, health
+and absorption writes, exhaustion, numeric edges, armor mutation during a hit
+and callback failures. Equipment, attribution, death services and other world
+consumers retain the controlled boundaries documented in the report. Connecting
+this binding to the resident client landing consumer remains the next step.

tools/test_server_player_combat_parity.py

@@ -80,13 +80,15 @@ def main():
     run(['cargo','build','--release','-p','horizon-world','--example','server_player_combat_fixture'],'compile-rust')
     metadata=json.loads(subprocess.check_output(['cargo','metadata','--no-deps','--format-version','1'],cwd=lab.ROOT,text=True))
     binary=Path(metadata['target_directory'])/'release/examples'/('server_player_combat_fixture.exe' if os.name=='nt' else 'server_player_combat_fixture')
-    run([binary,build],'rust');references=[]
+    run([binary,build],'rust')
+    run([binary,build,'--live'],'rust-live')
+    base.compare(build/'rust.txt',build/'rust-live.txt');references=[]
     for side,jar in jars.items():
         java(side,side,build);reference=build/f'{side}.txt';matched=base.compare(reference,build/'rust.txt')
         references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(reference,'sha256'),'matched_output_lines':matched})
         print(f'{side}: {matched:,} server player combat output lines match Rust',flush=True)
     base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged(fixture_paths,tested_fixtures)
-    report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,'scope':'Actual ServerPlayer outer hurt through Player/LivingEntity gates and actual Player inner damage, native armor/resistance reduction, registered modified attributes, synchronized health/absorption and FoodData exhaustion. Repeated hits, cooldown/state writes, death rejection, callbacks and numeric edges. Actual inherited invulnerability predicates include virtual flags, empty-equipment enchantment immunity, damage gamerules and client-loading/dimension guards; blocking amount, durability, effects, PvP permission, attribution, knockback, death services and criterion listeners remain controlled; enchanted items, registered sources and complete entity/game lifecycle remain pending.'}
+    report={'schema':1,'minecraft':lock['minecraft']['version'],'manifest_sha1':lock['minecraft']['manifest_sha1'],'platform':platform.platform(),'java':subprocess.check_output(['java','--version'],text=True).splitlines()[0],'rustc':subprocess.check_output(['rustc','--version'],text=True).strip(),'fixtures':len(fixtures),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'live_rust_output_sha256':lab.digest(build/'rust-live.txt','sha256'),'references':references,'scope':'Both EntityAttributes and LiveAttributes storage bindings produce the same native traces. Actual ServerPlayer outer hurt through Player/LivingEntity gates and actual Player inner damage, native armor/resistance reduction, registered modified attributes, synchronized health/absorption and FoodData exhaustion. Repeated hits, cooldown/state writes, death rejection, callbacks and numeric edges. Actual inherited invulnerability predicates include virtual flags, empty-equipment enchantment immunity, damage gamerules and client-loading/dimension guards; blocking amount, durability, effects, PvP permission, attribution, knockback, death services and criterion listeners remain controlled; enchanted items, registered sources and complete entity/game lifecycle remain pending.'}
     lab.write_json(report_path,report);print(f'Scoped server player combat parity passed: {report_path}')