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Implement native block-pile placement and support checks

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Ludovic Marie committed 2026-10-06 12:20:29 +02:00
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commit 801bec30d5
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.github/workflows/ci.yml
+4
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@@ -111,6 +111,10 @@ jobs:
env:
RUSTUP_TOOLCHAIN: stable
run: python tools/test_neighbor_spread_parity.py
- name: Compare block-pile support and placement
env:
RUSTUP_TOOLCHAIN: stable
run: python tools/test_block_pile_parity.py
- name: Compare ordered single-block replacement features
env:
RUSTUP_TOOLCHAIN: stable
benchmarks/rust-block-pile-2026-10-06/scoped-parity.json
+204
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@@ -0,0 +1,204 @@
{
"schema": 1,
"minecraft": "26.3",
"manifest_sha1": "4fe1aa1ef8da1cb95c5bad1fb98890ca56dd8ca3",
"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": 75667,
"candidate_states": 35723,
"double_plant_blocks": 10,
"mossy_carpet_blocks": 1,
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"crates/horizon-world/src/worldgen/fluid_predicate.rs": "e682d13a21f90605215b79f5d254bf2e524d35e89eab2e3b46384709af80b847",
"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",
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"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/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",
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"crates/horizon-world/src/worldgen/value_provider.rs": "3358b563db8cb0bc8a9cfbbe2b8b3e70941cd2d37a0b519fbb6545f8d0dcbb69",
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"crates/horizon-world/examples/simple_block_fixture.rs": "9eae8e6ed390a49460496a7a6e7f6d631f1ad1fe21e6ffdbeeb1e79b7f92c0f9"
},
"fixtures_sha256": {
".local/rust-block-pile-parity/inputs.txt": "754699b4804baf4a9be28d665b053e6ae8b93a4b418b0d8eaa8004159a853851",
".local/rust-block-pile-parity/block-properties.nbt": "1aba22092f70d16b8092014c058ddc210e4aaa77bac32f6ec62e4d0e91d92a99",
".local/rust-block-pile-parity/block-registry.nbt": "5042073c80753f9548cb8fdb5b1000f0e5a1220127a0cc3c6a75737e180bf9bb",
".local/rust-block-pile-parity/cached-collision.nbt": "f3a5c6a5b2d51dad6c52e486e2b9989e79fd55db1a9bda6196db399550b04078",
".local/rust-block-pile-parity/cached-support.nbt": "b6fdc9471b0b61e904206d3f099f4dc235aad6d723536c210be0cb7c3560d82c",
".local/rust-block-pile-parity/catalog.json": "93581107e3564e60261044fdca61e3b7f237b9e6724c14b86e335ccc01198ba9",
".local/rust-block-pile-parity/facts.json": "5e89a805514cabfe46e082d651db406b9479781e1d97b65faa2ab9f6f871309b",
".local/rust-block-pile-parity/feature-catalog.json": "c048c761c5084a40560731955cc999a364d14055bdd86fa50989a92e4a771286",
".local/rust-block-pile-parity/fluid-tags.json": "f1e5eb6d22ea7effbb118a2282709cfdeef1bfae4516b775a55ad7a4df29d7d0",
".local/rust-block-pile-parity/placement-definitions.json": "f8a972ec87c2352500af6481158a3192bdbf699951025639bea744e4127b97c4",
".local/rust-block-pile-parity/support-cached-states.json": "353945a58fe69b352925473f1693f9b14a9ad19f13c15159c4184f2c29258622",
".local/rust-block-pile-parity/survival-classes.json": "361832008eea0aa9151d367a125a19c6353d99a0b88b27dd0682f55b7954553e",
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".local/rust-block-pile-parity/survival-placement-classes.json": "7fdbf48ab18c87098bbe1b6176cb81f4842b6c5d9a4d6bbaf7037ff61cb1848c",
".local/rust-block-pile-parity/survival-rules.json": "8805c18b3195bb1eac1f1e5281333df56e2892505f64023e5403c58ce2ec4368",
".local/rust-block-pile-parity/survival-support-tags.json": "15d88d5bb5ad10d65124d5abb2cc055d251b06d129bca7be06f55b43dc13f6fd",
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},
"rust_output_sha256": "639bf7fa3f07d6b293eef1ed6422ac1a465944cd5369fe82d804f499f176c69e",
"references": [
{
"side": "client",
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"output_sha256": "639bf7fa3f07d6b293eef1ed6422ac1a465944cd5369fe82d804f499f176c69e",
"matched_output_lines": 11995254
},
{
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}
],
"scope": "Native BlockPileFeature codec and placement with every candidate and supporting block state. Minimum-height early return, radius sampling, native inclusive-box visit order, squared-distance float arithmetic, sparse outer draws, air variants, dirt-path random acceptance, cached/dynamic FULL upper support, provider selection and fallback reads, flags 260, rejected writes, partial failures, repeated calls and both random streams are compared. Named providers and overlay/modifier composition use the same world. Wrapped boxes with finite native counts and failure-terminated prefixes of negative-count boxes are included; Rust bounds pathological iteration to 2^20 visits. Block entities are absent in this fixture. Resident chunks, block updates and complete gameplay remain pending."
}
crates/horizon-world/examples/simple_block_fixture.rs
+8
View File
@@ -190,6 +190,14 @@ impl<W: Write, R: RandomSource> PlacementContext for World<'_, '_, W, R> {
direction: Direction,
) -> Result<bool, PlacementQueryError> {
let state = self.get(p).map_err(query)?;
self.state_face_sturdy(state, p, direction)
}
fn state_face_sturdy(
&mut self,
state: BlockStateId,
p: [i32; 3],
direction: Direction,
) -> Result<bool, PlacementQueryError> {
let support = self.support;
support
.is_face_sturdy(self, state, p, direction, SupportType::Full)
crates/horizon-world/src/worldgen.rs
+1
View File
@@ -9,6 +9,7 @@ pub mod biome_source;
pub mod biome_temperature;
pub mod block_column;
pub mod block_feature;
pub mod block_pile;
pub mod block_predicate;
pub mod bulk_section;
pub mod carver;
crates/horizon-world/src/worldgen/block_pile.rs
+160
View File
@@ -0,0 +1,160 @@
//! Randomized two-layer piles, with native support checks and write flags.
use super::{
DecodeError, Object,
block_feature::FeatureBlockBindings,
block_predicate::PredicateBlockResolver,
feature::FeatureWorld,
placement::{PlacementContext, PlacementQueryError},
required,
state_provider::{BlockStateProvider, StateProviderError},
};
use crate::registry::BlockStateId;
use horizon_core::{
geometry::Direction,
random::{InvalidBound, RandomSource},
};
use std::{collections::BTreeSet, sync::Arc};
#[derive(Clone, Debug)]
pub struct BlockPileFeature {
provider: BlockStateProvider,
air: [BlockStateId; 3],
paths: Arc<BTreeSet<BlockStateId>>,
}
#[derive(Debug)]
pub enum BlockPileError<E> {
Random(InvalidBound),
Provider(StateProviderError<E>),
Query(PlacementQueryError),
World(E),
WorkLimit,
}
impl<E: std::fmt::Display> std::fmt::Display for BlockPileError<E> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Random(e) => e.fmt(f),
Self::Provider(e) => e.fmt(f),
Self::Query(e) => e.fmt(f),
Self::World(e) => e.fmt(f),
Self::WorkLimit => f.write_str("block pile work limit exceeded"),
}
}
}
impl<E: std::error::Error + 'static> std::error::Error for BlockPileError<E> {}
impl BlockPileFeature {
pub fn from_json(json: &str, bindings: &FeatureBlockBindings<'_>) -> Result<Self, DecodeError> {
Self::decode(json, bindings, 0, &mut 65536)
}
pub(crate) fn decode(
json: &str,
bindings: &FeatureBlockBindings<'_>,
depth: usize,
remaining: &mut usize,
) -> Result<Self, DecodeError> {
if depth > 128 || *remaining == 0 {
return Err(DecodeError::Field("block pile depth or work"));
}
*remaining -= 1;
let object: Object = serde_json::from_str(json)?;
let (providers, catalog, _) = bindings
.simple_blocks
.as_ref()
.ok_or(DecodeError::Field("block pile provider bindings"))?;
Ok(Self {
provider: catalog.provider_with_budget(
required(&object, "state_provider")?.get(),
providers,
depth + 1,
remaining,
)?,
air: bindings.air,
paths: bindings.predicate_block_set(r#""minecraft:dirt_path""#)?,
})
}
pub fn place<W: FeatureWorld + PlacementContext>(
&self,
world: &mut W,
random: &mut impl RandomSource,
origin: [i32; 3],
) -> Result<bool, BlockPileError<W::Error>> {
if origin[1]
< world
.min_y()
.map_err(BlockPileError::Query)?
.wrapping_add(5)
{
return Ok(false);
}
let rx = 2 + random.next_int_bound(2).map_err(BlockPileError::Random)?;
let rz = 2 + random.next_int_bound(2).map_err(BlockPileError::Random)?;
let a = [
origin[0].wrapping_sub(rx),
origin[1],
origin[2].wrapping_sub(rz),
];
let b = [
origin[0].wrapping_add(rx),
origin[1].wrapping_add(1),
origin[2].wrapping_add(rz),
];
let min: [i32; 3] = std::array::from_fn(|i| a[i].min(b[i]));
let sizes: [i32; 3] =
std::array::from_fn(|i| a[i].max(b[i]).wrapping_sub(min[i]).wrapping_add(1));
let count = sizes[0].wrapping_mul(sizes[1]).wrapping_mul(sizes[2]);
let mut index: i32 = 0;
// Native betweenClosed stops on equality, including overflowed counts.
// Ordinary piles visit at most 98 cells; pathological boxes are bounded.
while index != count {
if index == 1_048_576 {
return Err(BlockPileError::WorkLimit);
}
let quotient = index / sizes[0];
let p = [
min[0].wrapping_add(index % sizes[0]),
min[1].wrapping_add(quotient % sizes[1]),
min[2].wrapping_add(quotient / sizes[1]),
];
index += 1;
let dx = origin[0].wrapping_sub(p[0]);
let dz = origin[2].wrapping_sub(p[2]);
let distance = dx.wrapping_mul(dx).wrapping_add(dz.wrapping_mul(dz)) as f32;
let threshold = random.next_float() * 10.0 - random.next_float() * 6.0;
if distance <= threshold || f64::from(random.next_float()) < 0.031 {
self.try_place(world, random, p)?;
}
}
Ok(true)
}
fn try_place<W: FeatureWorld + PlacementContext>(
&self,
world: &mut W,
random: &mut impl RandomSource,
p: [i32; 3],
) -> Result<(), BlockPileError<W::Error>> {
if !self
.air
.contains(&world.block(p).map_err(BlockPileError::World)?)
{
return Ok(());
}
let below = [p[0], p[1].wrapping_sub(1), p[2]];
let support = world.block(below).map_err(BlockPileError::World)?;
let allowed = if self.paths.contains(&support) {
random.next_boolean()
} else {
world
.state_face_sturdy(support, below, Direction::Up)
.map_err(BlockPileError::Query)?
};
if allowed {
let state = self
.provider
.get_state(world, random, p)
.map_err(BlockPileError::Provider)?;
world
.set_block(p, state, 260)
.map_err(BlockPileError::World)?;
}
Ok(())
}
}
crates/horizon-world/src/worldgen/feature_graph.rs
+13
View File
@@ -45,6 +45,7 @@ pub enum FeatureDefinition {
cap: Option<Box<PlacedFeatureDefinition>>,
},
BlockColumn(super::block_column::BlockColumnFeature),
BlockPile(super::block_pile::BlockPileFeature),
SimpleBlock(super::simple_block::SimpleBlockFeature),
FillLayer(FillLayerFeature),
ReplaceBlock(ReplaceBlockFeature),
@@ -65,6 +66,7 @@ pub enum FeatureExecutionError<E> {
Basic(FeatureError<E>),
Provider(super::state_provider::StateProviderError<E>),
BlockColumn(super::block_column::BlockColumnError<E>),
BlockPile(super::block_pile::BlockPileError<E>),
SimpleBlock(super::simple_block::SimpleBlockError<E>),
Random(InvalidBound),
Query(PlacementQueryError),
@@ -77,6 +79,7 @@ impl<E: std::fmt::Display> std::fmt::Display for FeatureExecutionError<E> {
Self::Basic(e) => e.fmt(f),
Self::Provider(e) => e.fmt(f),
Self::BlockColumn(e) => e.fmt(f),
Self::BlockPile(e) => e.fmt(f),
Self::SimpleBlock(e) => e.fmt(f),
Self::Random(e) => e.fmt(f),
Self::Query(e) => e.fmt(f),
@@ -243,6 +246,13 @@ impl FeatureDefinition {
)?)?;
match kind.as_str() {
"minecraft:no_op" => Ok(Self::NoOp),
"minecraft:block_pile" => super::block_pile::BlockPileFeature::decode(
json,
blocks.ok_or(DecodeError::Field("block pile bindings"))?,
depth,
remaining,
)
.map(Self::BlockPile),
"minecraft:random_neighbor_spread" => {
let bindings =
blocks.ok_or(DecodeError::Field("neighbor spread block bindings"))?;
@@ -541,6 +551,9 @@ impl FeatureDefinition {
.place(world, random, origin, run.blocks)
.map_err(FeatureExecutionError::Basic),
Self::NoOp => Ok(true),
Self::BlockPile(feature) => feature
.place(world, random, origin)
.map_err(FeatureExecutionError::BlockPile),
Self::NeighborSpread {
provider,
neighbors,
crates/horizon-world/src/worldgen/placement/context.rs
+9
View File
@@ -60,6 +60,15 @@ pub trait PlacementContext {
) -> Result<bool, PlacementQueryError> {
Err(PlacementQueryError::Unavailable)
}
/// Evaluate FULL support using an already-read state, without reading it again.
fn state_face_sturdy(
&mut self,
_state: crate::registry::BlockStateId,
_position: [i32; 3],
_direction: horizon_core::geometry::Direction,
) -> Result<bool, PlacementQueryError> {
Err(PlacementQueryError::Unavailable)
}
/// Read the block state and evaluate FULL support on the requested face.
fn face_sturdy(
&mut self,
docs/rust-parity.md
+15
View File
@@ -413,3 +413,18 @@ rejected writes, nested modifiers, repeated calls, random-stream tails and both
Java random modes. This verifies scoped composition behavior; complete chunk
generation and gameplay remain pending. Workspace tests and all-target Clippy
also pass for this implementation.
## Block-pile placement
Rust block piles preserve radius and sparse-candidate random draws, air checks,
dirt-path acceptance, state-aware FULL upper support, provider fallback reads,
and update flags 260. Previously read support states are evaluated without an
extra world read. The [native comparison](../benchmarks/rust-block-pile-2026-10-06/scoped-parity.json)
matches **11,995,254 lines per reference JAR**, covering every candidate and
supporting registry state, partial failures, rejected writes, repeated placement,
and overlay/modifier composition. Workspace tests and all-target Clippy pass.
Ordinary piles visit at most 98 cells. Rust preserves wrapped native box traversal
but limits pathological iteration to 2^20 cells; negative-count overflow fixtures
compare failure-terminated prefixes. Dynamic block entities are absent in this
feature fixture, and resident-world block updates remain pending.
tools/test_block_pile_parity.py
+62
View File
@@ -0,0 +1,62 @@
#!/usr/bin/env python3
"""Compare block-pile support, ordered mutations and random consumption."""
import itertools
import json
try:
from . import test_simple_block_parity as harness
except ImportError:
import test_simple_block_parity as harness
def corpus(facts, placement):
states = facts['states']
get = lambda name: facts['defaults']['minecraft:' + name]
def pile(provider=None):
return {'type': 'block_pile', 'state_provider': provider if provider is not None else {'id': 'stone'}}
def case(definition=None, support=None, **extra):
origin = extra.pop('origin', [0, 64, 0])
wrap = lambda value: (value + 2**31) % 2**32 - 2**31
floor = [[wrap(origin[0]+x), wrap(origin[1]-1), wrap(origin[2]+z), support if support is not None else get('stone')]
for z in range(-3, 4) for x in range(-3, 4)]
value = {'definition': json.dumps(definition if definition is not None else pile(), separators=(',', ':')),
'mode': 'feature', 'origin': origin, 'legacy': False, 'seed': 0, 'world_seed': 1,
'fail': -1, 'reject': 0, 'brightness': 15, 'fallback': get('air'), 'states': floor, 'repeats': 1}
value.update(extra)
return value
# Every output candidate and every supporting state in the pinned registry.
for state in states:
yield case(pile(state))
for state in range(len(states)):
yield case(support=state)
providers = [{'id': 'stone'}, {'type': 'random_block', 'blocks': []},
{'type': 'random_block', 'blocks': ['stone', 'water', 'hay_block']},
{'type': 'rotated', 'state': {'id': 'oak_log'}},
{'type': 'weighted', 'entries': [{'data': 'stone', 'weight': 1}, {'data': 'hay_block', 'weight': 3}]},
'horizon:stone']
for provider, ground, legacy, seed, fail, reject in itertools.product(
providers, ['stone', 'dirt_path', 'air', 'oak_slab', 'shulker_box', 'moving_piston'],
[False, True], [0, -1, 0x123456789abcdef], [-1, 0, 1, 2, 7, 19], [0, 1, 3]):
yield case(pile(provider), support=get(ground), legacy=legacy, seed=seed, fail=fail, reject=reject, repeats=2)
for fallback, y, seed in itertools.product(['air', 'cave_air', 'void_air', 'water', 'short_grass', 'snow'],
[-64, -60, -59, -58, 319, 320, 2147483647, -2147483648], range(4)):
yield case(fallback=get(fallback), origin=[-17, y, -33], seed=seed)
for x, z, seed in itertools.product([2147483647, -2147483648], [2147483647, -2147483648], range(8)):
yield case(origin=[x, 64, z], seed=seed)
# One overflowing horizontal dimension produces a negative native iterator
# count; injected failures terminate after a finite matching prefix.
for x, z in [(2147483647, 0), (0, -2147483648)]:
for fail in [0, 1, 3]:
yield case(origin=[x, 64, z], fail=fail)
for value in [None, False, {}, [], 'missing', {'id': 'missing'}]:
yield case({'type': 'block_pile', 'state_provider': value})
yield case({'type': 'block_pile'})
for legacy, seed, fail, reject in itertools.product([False, True], [0, -1, 0x123456789abcdef], [-1, 0, 5, 21], [0, 3]):
placed = {'feature': pile(providers[2]), 'placement': [{'type': 'count', 'count': 2}, {'type': 'in_square'}]}
yield case(placed, mode='placed', legacy=legacy, seed=seed, fail=fail, reject=reject)
yield case({'type': 'overlay', 'features': [placed, {'feature': 'horizon:moss', 'placement': []}]},
legacy=legacy, seed=seed, fail=fail, reject=reject)
if __name__ == '__main__':
harness.run(corpus, 'rust-block-pile-parity', __file__,
'Native BlockPileFeature codec and placement with every candidate and supporting block state. Minimum-height early return, radius sampling, native inclusive-box visit order, squared-distance float arithmetic, sparse outer draws, air variants, dirt-path random acceptance, cached/dynamic FULL upper support, provider selection and fallback reads, flags 260, rejected writes, partial failures, repeated calls and both random streams are compared. Named providers and overlay/modifier composition use the same world. Wrapped boxes with finite native counts and failure-terminated prefixes of negative-count boxes are included; Rust bounds pathological iteration to 2^20 visits. Block entities are absent in this fixture. Resident chunks, block updates and complete gameplay remain pending.')