Implement proto-chunk block-entity storage and coordinate resolution

2026-10-06 14:59:17 +02:00
parent e9a082517b
commit e755a5920a
9 changed files with 731 additions and 0 deletions
@@ -187,6 +187,10 @@ jobs:
        env:
          RUSTUP_TOOLCHAIN: stable
        run: python tools/test_generation_tick_parity.py
+      - name: Compare proto-chunk block-entity storage and coordinates
+        env:
+          RUSTUP_TOOLCHAIN: stable
+        run: python tools/test_block_entity_storage_parity.py
      - name: Compare ordered single-block replacement features
        env:
          RUSTUP_TOOLCHAIN: stable
@@ -0,0 +1,205 @@
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+    "crates/horizon-world/src/worldgen/feature.rs": "40500af71ee6628dfb27518262d99f08d0383ae6c7b9397452feef0c213eadd9",
+    "crates/horizon-world/src/worldgen/feature_catalog.rs": "efc7b17b227e71622ef34108be9abd010f5675b68ea0409fcab82581d9aab88a",
+    "crates/horizon-world/src/worldgen/feature_graph.rs": "da132fca9fdafb0d89a917d5f4b68c60b70fb33cadf948a107da0e35d83dcd91",
+    "crates/horizon-world/src/worldgen/feature_region.rs": "7677027594ed3df5e538402d5a3ba9276b67b56490463ca2686bfa418d02bd24",
+    "crates/horizon-world/src/worldgen/feature_sort.rs": "3488a093dfe1321aaa29d8a30cfb115d8e666a81bf195514e87b170de626835c",
+    "crates/horizon-world/src/worldgen/fluid_predicate.rs": "64197c9e63bebf1ce04bc280bfe980bb6c1b9aa887ca5cded904aeb0d9ae6c46",
+    "crates/horizon-world/src/worldgen/height_provider.rs": "368d4dc119854742a045c4a717679c921456da681fc5f71aa9b37102d6f33b47",
+    "crates/horizon-world/src/worldgen/material_condition/codec.rs": "09b909bc384472f76d163c8069ec6b507c7d5c6a028a36d5e0e3df20deff7b3b",
+    "crates/horizon-world/src/worldgen/material_condition/density.rs": "df9d0761e978e5010663ae8b44f2d6c1ecb4907331e333bdb6a2b487c1e107de",
+    "crates/horizon-world/src/worldgen/material_condition/library.rs": "a55534c5da97575a819af5a7dc0dbec9069993fa8b2619c6c9d5576946e683fa",
+    "crates/horizon-world/src/worldgen/material_condition/noise.rs": "ffb59cc6be2275d7a5621bf7d768527e74a8326ed7ad78618746711540921675",
+    "crates/horizon-world/src/worldgen/material_condition/rule.rs": "fed643352efbcb1f68f29b6241896617db889fc7c577a6247564e01922fec1fe",
+    "crates/horizon-world/src/worldgen/material_condition.rs": "d638dcb8cbcb5da20b3cb29602b0ae6a86c4fdf9d8c0fb725de8ec5fc108717e",
+    "crates/horizon-world/src/worldgen/material_extensions.rs": "ab806eb679d5116e1aebb64fca70e1499ae71f83c9507a8cb4c3201c2b1bf037",
+    "crates/horizon-world/src/worldgen/material_stage.rs": "698cbc786eff13c246e2bc2ea062401918cd4265899fbc3d53abc87e45a8e7a1",
+    "crates/horizon-world/src/worldgen/material_surface.rs": "5d37b90099df3d6da0845dab164e71469fb287019c2ee74bc6714f3b9d6d6d5b",
+    "crates/horizon-world/src/worldgen/ore_feature.rs": "83b89fd3be691c5412c0215b6abefdcaa44119a05aa41217e061970eb7e12ebd",
+    "crates/horizon-world/src/worldgen/placement/chain.rs": "9218399b4d3757f7bbc550d7729a7201f32a1c83a7030865e0c12aab8a80d116",
+    "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": "d35ded93fe6e95ea045cadcf4925e656dc34ef832b742179b9ad0cc49f902f31",
+    "crates/horizon-world/src/worldgen/terrain.rs": "b8fb9fb80a66a851d916f07f15df1a40b6cc95b49e71aaec4d4b4107f13d9f9f",
+    "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": "1d79a7fdb5dd18b0b59079cb2dc74682ba7af2a650c8efff027cfa530eee7bf9",
+    "crates/horizon-world/src/worldgen.rs": "e8e9f099ee1fcec8eedce31805d676d3f89c18e84f494a147ffcbfee23d3d54f",
+    "crates/horizon-world/examples/block_entity_storage_fixture.rs": "feefacc51bcf2b5af62869130512ac150664470c07cc2c2746d9258a6709b181"
+  },
+  "fixtures_sha256": {
+    ".local/rust-block-entity-storage-parity/inputs.txt": "9b9242240b36a6b65fbc0a3c707685946cbbbe16cfcafa59c5b16bd5aa33718f"
+  },
+  "rust_output_sha256": "81304a08cb574ec6b4c46ea76ffd4bdd8bfc331d5b07bd4bc4de3d7564340dc9",
+  "references": [
+    {
+      "side": "client",
+      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
+      "output_sha256": "81304a08cb574ec6b4c46ea76ffd4bdd8bfc331d5b07bd4bc4de3d7564340dc9",
+      "matched_output_lines": 78251
+    },
+    {
+      "side": "server",
+      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
+      "output_sha256": "81304a08cb574ec6b4c46ea76ffd4bdd8bfc331d5b07bd4bc4de3d7564340dc9",
+      "matched_output_lines": 78251
+    }
+  ],
+  "scope": "Native BlockEntity.getPosFromTag and actual ProtoChunk pending/active insertion, lookup, removal, position union and pending-save fallback. NumericTag coordinate reads cover integer narrowing, float/double floor overflow, infinities/NaNs, missing/nonnumeric fields, wrong-chunk relocation and wrapped chunk coordinates. Active entries replace pending data; later pending records cannot overwrite active entries. In-place pending coordinate mutation retains the original map key. Native chest entities carry loot seeds for active identity and basic saving-metadata comparisons; Rust supplies caller-owned payload serialization. Iteration order is normalized, and pending reads are borrowed/owned values rather than unrestricted Java aliases. Entity creation from NBT, complete entity serializers, active behavior and integration with chunk lifecycle remain pending."
+}
@@ -0,0 +1,169 @@
+use horizon_core::position::{BlockPos, ChunkPos};
+use horizon_world::{
+    block_entities::{ProtoBlockEntities, position_from_tag},
+    nbt::Tag,
+};
+use std::{
+    fs,
+    io::{self, BufRead, Write},
+    str::SplitWhitespace,
+};
+struct Input<'a>(SplitWhitespace<'a>);
+impl Input<'_> {
+    fn int(&mut self) -> i32 {
+        self.0.next().unwrap().parse().unwrap()
+    }
+    fn long(&mut self) -> i64 {
+        self.0.next().unwrap().parse().unwrap()
+    }
+    fn pos(&mut self) -> BlockPos {
+        BlockPos::new(self.int(), self.int(), self.int())
+    }
+    fn tag(&mut self) -> Option<Tag> {
+        let kind = self.0.next().unwrap();
+        let text = self.0.next().unwrap();
+        Some(match kind {
+            "none" => return None,
+            "byte" => Tag::Byte(text.parse().unwrap()),
+            "short" => Tag::Short(text.parse().unwrap()),
+            "int" => Tag::Int(text.parse().unwrap()),
+            "long" => Tag::Long(text.parse().unwrap()),
+            "float" => {
+                let bits = u32::from_str_radix(text, 16).unwrap();
+                Tag::Float(if f32::from_bits(bits) == 0.0 { 0 } else { bits })
+            }
+            "double" => {
+                let bits = u64::from_str_radix(text, 16).unwrap();
+                Tag::Double(if f64::from_bits(bits) == 0.0 { 0 } else { bits })
+            }
+            "string" => Tag::String(text.into()),
+            _ => panic!("unknown atom"),
+        })
+    }
+}
+fn xyz(p: BlockPos) -> String {
+    format!("{} {} {}", p.x, p.y, p.z)
+}
+fn atom(tag: Option<&Tag>) -> String {
+    match tag {
+        None => "none".into(),
+        Some(Tag::Float(v)) => format!("float:{v:x}"),
+        Some(Tag::Double(v)) => format!("double:{v:x}"),
+        Some(Tag::Byte(v)) => format!("1:{v}"),
+        Some(Tag::Short(v)) => format!("2:{v}"),
+        Some(Tag::Int(v)) => format!("3:{v}"),
+        Some(Tag::Long(v)) => format!("4:{v}"),
+        Some(v) => format!("{}:invalid", v.id()),
+    }
+}
+fn pending(tag: Option<&Tag>) -> String {
+    match tag {
+        None => "none".into(),
+        Some(tag) => {
+            let Some(Tag::Long(mark)) = tag.get("mark") else {
+                panic!("missing marker")
+            };
+            format!(
+                "{mark} {} {} {}",
+                atom(tag.get("x")),
+                atom(tag.get("y")),
+                atom(tag.get("z"))
+            )
+        }
+    }
+}
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let args: Vec<_> = std::env::args().collect();
+    let mut out = io::BufWriter::new(fs::File::create(&args[2])?);
+    let mut position = ChunkPos::default();
+    let mut chunk = ProtoBlockEntities::<i64>::new(position);
+    for (index, line) in io::BufReader::new(fs::File::open(&args[1])?)
+        .lines()
+        .enumerate()
+    {
+        let line = line?;
+        let mut input = Input(line.split_whitespace());
+        let op = input.0.next().unwrap();
+        writeln!(out, "command {index} {op}")?;
+        match op {
+            "reset" => {
+                position = ChunkPos::new(input.int(), input.int());
+                chunk = ProtoBlockEntities::new(position);
+            }
+            "pending" | "resolve" => {
+                let mut entries = std::collections::BTreeMap::new();
+                entries.insert("mark".into(), Tag::Long(input.long()));
+                for name in ["x", "y", "z"] {
+                    if let Some(tag) = input.tag() {
+                        entries.insert(name.into(), tag);
+                    }
+                }
+                let tag = Tag::Compound(entries);
+                writeln!(out, "position {}", xyz(position_from_tag(position, &tag)?))?;
+                if op == "pending" {
+                    chunk.set_pending(tag)?;
+                }
+            }
+            "active" => {
+                let p = input.pos();
+                chunk.set_active(p, input.long());
+            }
+            "remove" => {
+                chunk.remove(input.pos());
+            }
+            "mutate" => {
+                let p = input.pos();
+                let x = input.int();
+                if let Some(Tag::Compound(map)) = chunk.pending_mut(p) {
+                    map.insert("x".into(), Tag::Int(x));
+                }
+            }
+            "get" => {
+                let p = input.pos();
+                writeln!(
+                    out,
+                    "active {}",
+                    chunk.active(p).map_or("none".into(), ToString::to_string)
+                )?;
+                writeln!(out, "pending {}", pending(chunk.pending(p)))?;
+            }
+            "save" => {
+                let p = input.pos();
+                let saved = chunk.for_saving(p, |mark| {
+                    Ok::<_, io::Error>(Tag::compound([("LootTableSeed", Tag::Long(*mark))]))
+                })?;
+                if chunk.active(p).is_some() {
+                    let Some(Tag::Long(seed)) = saved.as_ref().unwrap().get("LootTableSeed") else {
+                        unreachable!()
+                    };
+                    writeln!(out, "saved active minecraft:chest {} {seed}", xyz(p))?;
+                } else {
+                    writeln!(out, "saved pending {}", pending(saved.as_ref()))?;
+                }
+            }
+            "dump" => {
+                let mut positions: Vec<_> = chunk.positions().into_iter().collect();
+                positions.sort_by_key(|p| (p.x, p.y, p.z));
+                for p in &positions {
+                    writeln!(
+                        out,
+                        "entry {} {} {}",
+                        xyz(*p),
+                        chunk.active(*p).map_or("none".into(), ToString::to_string),
+                        pending(chunk.pending(*p))
+                    )?;
+                }
+                writeln!(
+                    out,
+                    "size {} {}",
+                    positions.len(),
+                    chunk.pending_entries().len()
+                )?;
+            }
+            _ => panic!("unknown command"),
+        }
+        assert!(input.0.next().is_none());
+    }
+    out.flush()?;
+    Ok(())
+}
@@ -0,0 +1,102 @@
+//! Proto-chunk block-entity storage. Active payloads are caller-owned runtime
+//! types; this module does not create entities or execute their behavior.
+use crate::{compression::invalid, nbt::Tag};
+use horizon_core::position::{BlockPos, ChunkPos};
+use std::{
+    collections::{HashMap, HashSet},
+    io,
+};
+
+/// Resolve native block-entity coordinates, relocating mismatched X/Z into the
+/// owning chunk while retaining local offsets and the full Y coordinate. The
+/// supplied tag is not rewritten. NumericTag float/double reads use Mth.floor.
+pub fn position_from_tag(chunk: ChunkPos, tag: &Tag) -> io::Result<BlockPos> {
+    if !matches!(tag, Tag::Compound(_)) {
+        return Err(invalid("block entity is not a compound"));
+    }
+    let read = |name| match tag.get(name) {
+        Some(Tag::Byte(v)) => i32::from(*v),
+        Some(Tag::Short(v)) => i32::from(*v),
+        Some(Tag::Int(v)) => *v,
+        Some(Tag::Long(v)) => *v as i32,
+        Some(Tag::Float(bits)) => f64::from(f32::from_bits(*bits)).floor() as i32,
+        Some(Tag::Double(bits)) => f64::from_bits(*bits).floor() as i32,
+        _ => 0,
+    };
+    let (mut x, y, mut z) = (read("x"), read("y"), read("z"));
+    if x >> 4 != chunk.x || z >> 4 != chunk.z {
+        x = chunk.x.wrapping_shl(4).wrapping_add(x & 15);
+        z = chunk.z.wrapping_shl(4).wrapping_add(z & 15);
+    }
+    Ok(BlockPos::new(x, y, z))
+}
+
+pub struct ProtoBlockEntities<E> {
+    position: ChunkPos,
+    pending: HashMap<BlockPos, Tag>,
+    active: HashMap<BlockPos, E>,
+}
+impl<E> ProtoBlockEntities<E> {
+    pub fn new(position: ChunkPos) -> Self {
+        Self {
+            position,
+            pending: HashMap::new(),
+            active: HashMap::new(),
+        }
+    }
+    /// Ignore a pending record when an active entity already owns its resolved
+    /// position. Inserting an active entity removes any earlier pending record.
+    pub fn set_pending(&mut self, tag: Tag) -> io::Result<()> {
+        let position = position_from_tag(self.position, &tag)?;
+        if !self.active.contains_key(&position) {
+            self.pending.insert(position, tag);
+        }
+        Ok(())
+    }
+    /// Position must be the payload's immutable world position, as supplied by
+    /// the runtime's block-entity constructor. No chunk/build-height gate applies.
+    pub fn set_active(&mut self, position: BlockPos, entity: E) -> Option<E> {
+        self.pending.remove(&position);
+        self.active.insert(position, entity)
+    }
+    pub fn active(&self, position: BlockPos) -> Option<&E> {
+        self.active.get(&position)
+    }
+    pub fn active_mut(&mut self, position: BlockPos) -> Option<&mut E> {
+        self.active.get_mut(&position)
+    }
+    pub fn pending(&self, position: BlockPos) -> Option<&Tag> {
+        self.pending.get(&position)
+    }
+    /// Mutating coordinate fields does not re-key an existing pending entry.
+    pub fn pending_mut(&mut self, position: BlockPos) -> Option<&mut Tag> {
+        self.pending.get_mut(&position)
+    }
+    pub fn pending_entries(&self) -> &HashMap<BlockPos, Tag> {
+        &self.pending
+    }
+    pub fn positions(&self) -> HashSet<BlockPos> {
+        self.pending
+            .keys()
+            .chain(self.active.keys())
+            .copied()
+            .collect()
+    }
+    pub fn remove(&mut self, position: BlockPos) -> Option<E> {
+        self.pending.remove(&position);
+        self.active.remove(&position)
+    }
+    /// Serialize an active entity when present, otherwise clone its pending tag.
+    /// The caller supplies runtime serialization; this does not instantiate NBT.
+    pub fn for_saving<T>(
+        &self,
+        position: BlockPos,
+        serialize: impl FnOnce(&E) -> Result<Tag, T>,
+    ) -> Result<Option<Tag>, T> {
+        if let Some(entity) = self.active.get(&position) {
+            serialize(entity).map(Some)
+        } else {
+            Ok(self.pending.get(&position).cloned())
+        }
+    }
+}
@@ -2,6 +2,7 @@
 #![forbid(unsafe_code)]

 pub mod block_collision;
+pub mod block_entities;
 pub mod block_placement;
 pub mod block_properties;
 pub mod block_support;
@@ -0,0 +1,73 @@
+use horizon_core::position::{BlockPos, ChunkPos};
+use horizon_world::{block_entities::ProtoBlockEntities, nbt::Tag};
+
+#[test]
+fn invalid_pending_data_is_rejected_without_replacing_active_or_pending_entries() {
+    let mut store = ProtoBlockEntities::new(ChunkPos::new(0, 0));
+    let active = BlockPos::new(0, 64, 0);
+    store.set_active(active, "active");
+    let pending = Tag::compound([("x", Tag::Int(1)), ("y", Tag::Int(64)), ("z", Tag::Int(0))]);
+    store.set_pending(pending.clone()).unwrap();
+    assert!(store.set_pending(Tag::String("invalid".into())).is_err());
+    assert_eq!(store.active(active), Some(&"active"));
+    assert_eq!(store.pending(BlockPos::new(1, 64, 0)), Some(&pending));
+}
+
+#[test]
+fn failed_active_serialization_never_falls_back_to_stale_pending_data() {
+    let p = BlockPos::new(-1, 64, -1);
+    let mut store = ProtoBlockEntities::new(ChunkPos::new(-1, -1));
+    store
+        .set_pending(Tag::compound([
+            ("x", Tag::Int(15)),
+            ("y", Tag::Int(64)),
+            ("z", Tag::Int(15)),
+        ]))
+        .unwrap();
+    store.set_active(p, 42);
+    assert!(store.pending(p).is_none());
+    let result = store.for_saving(p, |_| Err::<Tag, _>("serialization failed"));
+    assert_eq!(result, Err("serialization failed"));
+    assert_eq!(store.remove(p), Some(42));
+    assert_eq!(
+        store.for_saving(p, |_| Err::<Tag, _>("must not run")),
+        Ok(None)
+    );
+}
+
+#[test]
+fn pending_save_snapshot_is_independent_and_mutating_coordinates_keeps_the_key() {
+    let mut store = ProtoBlockEntities::<()>::new(ChunkPos::new(0, 0));
+    let p = BlockPos::new(0, 0, 0);
+    store
+        .set_pending(Tag::compound([("payload", Tag::Long(42))]))
+        .unwrap();
+    let snapshot = store.for_saving(p, |_| Err::<Tag, _>(())).unwrap().unwrap();
+    let Some(Tag::Compound(tag)) = store.pending_mut(p) else {
+        panic!("pending")
+    };
+    tag.insert("x".into(), Tag::Int(123));
+    assert_eq!(snapshot.get("x"), None);
+    assert_eq!(store.pending(p).unwrap().get("x"), Some(&Tag::Int(123)));
+    assert!(store.pending(BlockPos::new(123, 0, 0)).is_none());
+}
+
+#[test]
+fn floating_coordinates_floor_before_saturating_to_java_int() {
+    use horizon_world::block_entities::position_from_tag;
+    for (value, expected) in [
+        (Tag::Float(0xcf000001), i32::MIN),
+        (Tag::Double(0xc1e0000000000001), i32::MIN),
+        (Tag::Float(f32::NEG_INFINITY.to_bits()), i32::MIN),
+        (Tag::Double(f64::INFINITY.to_bits()), i32::MAX),
+        (Tag::Double(f64::NAN.to_bits()), 0),
+        (Tag::Float((-1.5_f32).to_bits()), -2),
+        (Tag::Double((-1.5_f64).to_bits()), -2),
+    ] {
+        let tag = Tag::compound([("y", value)]);
+        assert_eq!(
+            position_from_tag(ChunkPos::new(0, 0), &tag).unwrap().y,
+            expected
+        );
+    }
+}
@@ -813,3 +813,23 @@ Vanilla's actual public/private write-zone methods provide the reference. Worksp
 tests, all-target Clippy and both focused fixture tests pass. The owning world
 still supplies generation-step metadata and upgrading-world vertical restrictions;
 full WorldGenRegion effects remain pending.
+
+## Proto-chunk block-entity storage
+
+Rust now stores pending NBT and caller-owned active block-entity payloads by full
+block position. Active insertion removes pending data, later pending insertion
+cannot overwrite an active entry, and removal clears both maps. Saving uses the
+active serializer when present and otherwise returns a pending snapshot. Changing
+pending coordinate fields retains the existing map key. Coordinate resolution
+matches NumericTag integer narrowing and floating-point flooring before saturating
+conversion, then relocates mismatched X/Z into the owning chunk.
+
+The [block-entity storage comparison](../benchmarks/rust-block-entity-storage-2026-10-06/scoped-parity.json)
+matches **78,251 lines per reference JAR** across **28,511 commands**, using actual
+native ProtoChunks and chest entities. Cases cover replacement, removal, position
+unions, save selection, missing/nonnumeric coordinates, infinities/NaNs, integer
+extremes and positions that alias when packed. Four focused Rust tests and
+all-target Clippy pass. Collection order is normalized; Rust exposes borrowed or
+owned data instead of unrestricted Java aliases. Entity construction from NBT,
+complete serializers, active entity behavior and resident chunk lifecycle
+integration remain pending.
@@ -0,0 +1,62 @@
+package dev.horizonlab.parity;
+import java.io.*;
+import java.nio.file.*;
+import java.util.*;
+import net.minecraft.core.*;
+import net.minecraft.core.registries.*;
+import net.minecraft.nbt.*;
+import net.minecraft.resources.*;
+import net.minecraft.world.level.*;
+import net.minecraft.world.level.biome.*;
+import net.minecraft.world.level.block.*;
+import net.minecraft.world.level.block.entity.*;
+import net.minecraft.world.level.chunk.*;
+import net.minecraft.world.level.storage.loot.LootTable;
+
+/** Native proto-chunk entity storage and numeric position transport. */
+public final class VanillaBlockEntityStorageOracle {
+    private static final Comparator<BlockPos> ORDER=Comparator.<BlockPos>comparingInt(BlockPos::getX).thenComparingInt(BlockPos::getY).thenComparingInt(BlockPos::getZ);
+    private static PalettedContainerFactory factory;
+    private static String xyz(BlockPos p){return p.getX()+" "+p.getY()+" "+p.getZ();}
+    private static final class Input {
+        String[] words;int cursor=1;Input(String line){words=line.split(" ");}
+        int integer(){return Integer.parseInt(words[cursor++]);}long number(){return Long.parseLong(words[cursor++]);}
+        BlockPos pos(){return new BlockPos(integer(),integer(),integer());}
+        Tag tag(){String type=words[cursor++],value=words[cursor++];return switch(type){
+            case "none"->null;case "byte"->ByteTag.valueOf(Byte.parseByte(value));case "short"->ShortTag.valueOf(Short.parseShort(value));case "int"->IntTag.valueOf(Integer.parseInt(value));case "long"->LongTag.valueOf(Long.parseLong(value));
+            case "float"->FloatTag.valueOf(Float.intBitsToFloat(Integer.parseUnsignedInt(value,16)));case "double"->DoubleTag.valueOf(Double.longBitsToDouble(Long.parseUnsignedLong(value,16)));case "string"->StringTag.valueOf(value);default->throw new AssertionError(type);
+        };}
+    }
+    private static String atom(Tag tag){
+        if(tag==null)return "none";
+        if(tag instanceof FloatTag value)return "float:"+Integer.toUnsignedString(Float.floatToRawIntBits(value.floatValue()),16);
+        if(tag instanceof DoubleTag value)return "double:"+Long.toUnsignedString(Double.doubleToRawLongBits(value.doubleValue()),16);
+        if(tag instanceof NumericTag value)return tag.getId()+":"+value.longValue();
+        return tag.getId()+":invalid";
+    }
+    private static String pending(CompoundTag tag){return tag==null?"none":tag.getLongOr("mark",0)+" "+atom(tag.get("x"))+" "+atom(tag.get("y"))+" "+atom(tag.get("z"));}
+    public static void main(String[] args)throws Exception {
+        net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();
+        Holder<Biome> biome=Holder.Reference.createStandAlone(new HolderOwner<Biome>(){},Biomes.PLAINS);var ids=new IdMapper<Holder<Biome>>();ids.add(biome);
+        factory=new PalettedContainerFactory(Strategy.createForBlockStates(Block.BLOCK_STATE_REGISTRY),Blocks.AIR.defaultBlockState(),null,Strategy.createForBiomes(ids),biome,null);
+        var registries=RegistryAccess.fromRegistryOfRegistries(BuiltInRegistries.REGISTRY);
+        var loot=ResourceKey.create(Registries.LOOT_TABLE,Identifier.parse("horizon:storage_probe"));
+        ProtoChunk chunk=null;
+        try(var input=Files.newBufferedReader(Path.of(args[0]));var out=new PrintWriter(Files.newBufferedWriter(Path.of(args[1])))){
+            String line;int index=0;
+            while((line=input.readLine())!=null){var in=new Input(line);String op=in.words[0];out.println("command "+index+++" "+op);
+                switch(op){
+                    case "reset"->chunk=new ProtoChunk(new ChunkPos(in.integer(),in.integer()),UpgradeData.EMPTY,LevelHeightAccessor.create(-64,384),factory,null);
+                    case "pending","resolve"->{var tag=new CompoundTag();tag.putLong("mark",in.number());for(String axis:new String[]{"x","y","z"}){var value=in.tag();if(value!=null)tag.put(axis,value);}out.println("position "+xyz(BlockEntity.getPosFromTag(chunk.getPos(),tag)));if(op.equals("pending"))chunk.setBlockEntityNbt(tag);}
+                    case "active"->{var p=in.pos();var entity=new ChestBlockEntity(p,Blocks.CHEST.defaultBlockState());entity.setLootTable(loot,in.number());chunk.setBlockEntity(entity);}
+                    case "remove"->chunk.removeBlockEntity(in.pos());
+                    case "mutate"->{var p=in.pos();int x=in.integer();var tag=chunk.getBlockEntityNbt(p);if(tag!=null)tag.putInt("x",x);}
+                    case "get","save"->{var p=in.pos();if(op.equals("get")){var active=chunk.getBlockEntity(p);out.println("active "+(active==null?"none":((ChestBlockEntity)active).getLootTableSeed()));out.println("pending "+pending(chunk.getBlockEntityNbt(p)));}else{var tag=chunk.getBlockEntityNbtForSaving(p,registries);if(chunk.getBlockEntity(p)!=null)out.println("saved active "+tag.getStringOr("id","")+" "+tag.getIntOr("x",0)+" "+tag.getIntOr("y",0)+" "+tag.getIntOr("z",0)+" "+tag.getLongOr("LootTableSeed",0));else out.println("saved pending "+pending(tag));}}
+                    case "dump"->{var positions=new TreeSet<BlockPos>(ORDER);positions.addAll(chunk.getBlockEntitiesPos());for(var p:positions){var entity=chunk.getBlockEntity(p);out.println("entry "+xyz(p)+" "+(entity==null?"none":((ChestBlockEntity)entity).getLootTableSeed())+" "+pending(chunk.getBlockEntityNbt(p)));}out.println("size "+positions.size()+" "+chunk.getBlockEntityNbts().size());}
+                    default->throw new AssertionError(op);
+                }
+                if(in.cursor!=in.words.length)throw new AssertionError("extra input");
+            }
+        }
+    }
+}
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+"""Compare native proto-chunk block-entity storage and NBT coordinate coercion."""
+import argparse
+from collections import Counter
+import json
+import os
+from pathlib import Path
+import platform
+import random
+import subprocess
+try:
+    from . import lab, test_rust_parity as base
+except ImportError:
+    import lab, test_rust_parity as base
+
+
+def corpus():
+    atoms=['none 0','string invalid']
+    for kind,values in [('byte',[-128,-1,0,1,127]),('short',[-32768,-1,0,1,32767]),('int',[-2147483648,-17,-16,-1,0,1,15,16,2147483647]),('long',[-9223372036854775808,-4294967297,-2147483649,-1,0,2147483648,4294967297,9223372036854775807])]:
+        atoms += [f'{kind} {v}' for v in values]
+    atoms += ['float '+bits for bits in ['00000000','80000000','00000001','80000001','3fc00000','bfc00000','4f000000','cf000000','cf000001','7f800000','ff800000','7fc00000','7f800001']]
+    atoms += ['double '+bits for bits in ['0000000000000000','8000000000000000','0000000000000001','8000000000000001','3ff8000000000000','bff8000000000000','41e0000000000000','c1e0000000000000','c1e0000000000001','7ff0000000000000','fff0000000000000','7ff8000000000000','7ff0000000000001']]
+    for cx,cz in [(0,0),(-1,-1),(1,-2),(-134217728,134217727),(-2147483648,2147483647)]:
+        yield f'reset {cx} {cz}'
+        for axis in range(3):
+            for i,atom in enumerate(atoms):
+                xyz=['int -1','int 64','int 31'];xyz[axis]=atom
+                yield 'resolve 0 '+' '.join(xyz)
+                yield f'pending {i} '+' '.join(xyz)
+        yield 'dump'
+    for marker in [-9223372036854775808,-1,0,1,9223372036854775807]:
+        yield 'reset -1 -1'
+        yield f'pending {marker} int 15 int 64 int 15'
+        yield 'get -1 64 -1';yield 'save -1 64 -1'
+        yield 'mutate -1 64 -1 2147483647'
+        yield 'get -1 64 -1';yield 'save -1 64 -1'
+        yield f'active -1 64 -1 {marker}'
+        yield 'pending 99 int 15 int 64 int 15'
+        yield 'get -1 64 -1';yield 'save -1 64 -1';yield 'dump'
+        yield 'remove -1 64 -1';yield 'get -1 64 -1';yield 'save -1 64 -1'
+    rng=random.Random(0x424c4f434b454e54)
+    for trial in range(12):
+        cx,cz=trial%3-1,trial%5-2
+        yield f'reset {cx} {cz}'
+        positions=[(cx*16+x,y,cz*16+z) for x in [0,1,15] for y in [-2147483648,-64,0,64,2147483647] for z in [0,1,15]]
+        positions += [(2147483647,-2147483648,-2147483648),(0,4096,0),(67108864,4096,-67108864)]
+        for _ in range(500):
+            p=rng.choice(positions);xyz=' '.join(map(str,p));op=rng.randrange(7)
+            if op<2:yield f'pending {rng.randrange(-2**63,2**63)} int {p[0]} int {p[1]} int {p[2]}'
+            elif op==2:yield f'active {xyz} {rng.randrange(-2**63,2**63)}'
+            elif op==3:yield f'remove {xyz}'
+            elif op==4:yield f'mutate {xyz} {rng.randrange(-2**31,2**31)}'
+            elif op==5:yield f'get {xyz}'
+            else:yield f'save {xyz}'
+            if rng.randrange(8)==0:yield 'dump'
+        yield 'dump'
+    yield 'reset 0 0'
+    for _ in range(20000):
+        xyz=[rng.choice([f'float {rng.getrandbits(32):08x}',f'double {rng.getrandbits(64):016x}',rng.choice(atoms)]) for _ in range(3)]
+        yield 'resolve 0 '+' '.join(xyz)
+
+
+def main():
+    parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
+    build=lab.LOCAL/'rust-block-entity-storage-parity';build.mkdir(parents=True,exist_ok=True)
+    report_path=build/'report.json';report_path.unlink(missing_ok=True)
+    if args.prepare:lab.prepare()
+    lock,jars,libraries=base.verify_artifacts()
+    oracle=lab.ROOT/'mods/horizon/src/test/java/dev/horizonlab/parity/VanillaBlockEntityStorageOracle.java'
+    sources=[oracle,Path(__file__),lab.ROOT/'tools/test_rust_parity.py',lab.ROOT/'tools/lab.py',lab.ROOT/'Cargo.toml',lab.ROOT/'Cargo.lock',lab.ROOT/'crates/horizon-core/Cargo.toml',lab.ROOT/'crates/horizon-world/Cargo.toml',*sorted((lab.ROOT/'crates/horizon-core/src').rglob('*.rs')),*sorted((lab.ROOT/'crates/horizon-world/src').rglob('*.rs')),lab.ROOT/'crates/horizon-world/examples/block_entity_storage_fixture.rs']
+    tested_sources=base.source_hashes(sources)
+    commands=list(corpus());inputs=build/'inputs.txt';inputs.write_text('\n'.join(commands)+'\n')
+    tested_fixtures=base.source_hashes([inputs]);classes=build/'classes';classes.mkdir(exist_ok=True)
+    def run(command,name):
+        with (build/(name+'.log')).open('w') as log:subprocess.run(list(map(str,command)),cwd=lab.ROOT,check=True,timeout=3600,stdout=log,stderr=subprocess.STDOUT)
+    dependencies=os.pathsep.join(map(str,libraries))
+    run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependencies,'-d',classes,oracle],'compile-java')
+    run(['cargo','build','--release','-p','horizon-world','--example','block_entity_storage_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'/('block_entity_storage_fixture.exe' if os.name=='nt' else 'block_entity_storage_fixture')
+    run([binary,inputs,build/'rust.txt'],'rust')
+    references=[]
+    for side,jar in jars.items():
+        run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jar),dependencies]),'dev.horizonlab.parity.VanillaBlockEntityStorageOracle',inputs,build/(side+'.txt')],side)
+        matched=base.compare(build/(side+'.txt'),build/'rust.txt')
+        references.append({'side':side,'jar_sha256':lab.digest(jar,'sha256'),'output_sha256':lab.digest(build/(side+'.txt'),'sha256'),'matched_output_lines':matched})
+        print(f'{side}: {matched:,} block-entity storage lines match Rust',flush=True)
+    base.ensure_sources_unchanged(sources,tested_sources);base.ensure_sources_unchanged([inputs],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(),
+            'commands':dict(Counter(c.split()[0] for c in commands)),'sources_sha256':tested_sources,'fixtures_sha256':tested_fixtures,'rust_output_sha256':lab.digest(build/'rust.txt','sha256'),'references':references,
+            'scope':'Native BlockEntity.getPosFromTag and actual ProtoChunk pending/active insertion, lookup, removal, position union and pending-save fallback. NumericTag coordinate reads cover integer narrowing, float/double floor overflow, infinities/NaNs, missing/nonnumeric fields, wrong-chunk relocation and wrapped chunk coordinates. Active entries replace pending data; later pending records cannot overwrite active entries. In-place pending coordinate mutation retains the original map key. Native chest entities carry loot seeds for active identity and basic saving-metadata comparisons; Rust supplies caller-owned payload serialization. Iteration order is normalized, and pending reads are borrowed/owned values rather than unrestricted Java aliases. Entity creation from NBT, complete entity serializers, active behavior and integration with chunk lifecycle remain pending.'}
+    lab.write_json(report_path,report);print(f'Scoped block-entity storage parity passed: {report_path}')
+
+if __name__=='__main__':main()