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Implement vanilla neighbor-derived fluid current vectors

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Ludovic Marie
2026-10-07 03:12:04 +02:00
parent c0a4faa869
commit becaf59bab
7 changed files with 585 additions and 0 deletions
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benchmarks/rust-fluid-flow-2026-10-07/scoped-parity.json
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{
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"minecraft": "26.3",
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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": 51846,
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},
"fixtures_sha256": {
".local/rust-fluid-flow-parity/inputs.txt": "89be628a59fb7bbe46ab265bcbce7f02e749495ba24ff58aaeea69636adbc5c1",
".local/rust-fluid-flow-parity/fluid-states.json": "f888b2d7adf0ee194a08900e6df9909933734b5d8dab648dc3e866d70ef3b659"
},
"rust_output_sha256": "55761f29153f1d25d6ef7ad0bd431a30f8c4e7ed2a12ad7f4bca215404ad5e7b",
"references": [
{
"side": "client",
"jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
"output_sha256": "55761f29153f1d25d6ef7ad0bd431a30f8c4e7ed2a12ad7f4bca215404ad5e7b",
"matched_output_lines": 1051071
},
{
"side": "server",
"jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
"output_sha256": "55761f29153f1d25d6ef7ad0bd431a30f8c4e7ed2a12ad7f4bca215404ad5e7b",
"matched_output_lines": 1051071
}
],
"scope": "Actual registered FluidState.getFlow / FlowingFluid.getFlow and solid-face helper over every registered fluid state. Ordered horizontal and downward neighbor reads, fluid families, BLOCKS_FLUID_FLOW tag, IceBlock guard, falling-wall deflection, f32 height differences, vector normalization, wrapping coordinates and injected failures. Block flags and face support are controlled; registry/world support binding, spreading and full gameplay remain pending."
}
crates/horizon-world/examples/fluid_flow_fixture.rs
+113
View File
@@ -0,0 +1,113 @@
use horizon_core::{geometry::Direction, position::BlockPos};
use horizon_world::{
fluid::FluidState,
fluid_flow::{self, FluidFlowWorld},
};
use serde_json::Value;
use std::{
fs,
io::{self, Write},
path::Path,
};
fn pos(p: BlockPos) -> String {
format!("{} {} {}", p.x, p.y, p.z)
}
struct World<'a> {
f: &'a Value,
out: &'a mut dyn Write,
calls: i64,
fluids: Vec<FluidState>,
}
impl World<'_> {
fn query(&mut self, s: String) -> io::Result<()> {
writeln!(self.out, "{s}")?;
let n = self.calls;
self.calls += 1;
if n == self.f["fail"].as_i64().unwrap() {
Err(io::Error::other("injected flow failure"))
} else {
Ok(())
}
}
fn cell(&self, p: BlockPos) -> usize {
self.f["cells"]
.get(pos(p))
.unwrap_or(&self.f["default"])
.as_u64()
.unwrap() as usize
}
}
impl FluidFlowWorld for World<'_> {
type Error = io::Error;
type Block = usize;
fn fluid(&mut self, p: BlockPos) -> io::Result<FluidState> {
self.query(format!("fluid {}", pos(p)))?;
Ok(self.fluids[self.cell(p)])
}
fn block(&mut self, p: BlockPos) -> io::Result<usize> {
self.query(format!("block {}", pos(p)))?;
Ok(self.cell(p))
}
fn blocks_fluid_flow(&self, s: usize) -> bool {
self.f["states"][s]["blocks_flow"].as_bool().unwrap()
}
fn is_ice_class(&self, s: usize) -> bool {
self.f["states"][s]["ice"].as_bool().unwrap()
}
fn is_face_sturdy(&mut self, s: usize, p: BlockPos, d: Direction) -> io::Result<bool> {
let name = ["down", "up", "north", "south", "west", "east"][d as usize];
self.query(format!("sturdy {} {name}", pos(p)))?;
Ok(self.f["states"][s]["faces"].as_u64().unwrap() & (1 << (d as u8)) != 0)
}
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let arg = std::env::args().nth(1).expect("private fixture directory");
let dir = Path::new(&arg);
let mut out = io::BufWriter::new(fs::File::create(dir.join("rust.txt"))?);
for line in fs::read_to_string(dir.join("inputs.txt"))?.lines() {
let f: Value = serde_json::from_str(line)?;
let fluids = f["states"]
.as_array()
.unwrap()
.iter()
.map(|s| FluidState::from_json(&s["fluid"].to_string()))
.collect::<io::Result<Vec<_>>>()?;
let mut w = World {
f: &f,
out: &mut out,
calls: 0,
fluids,
};
let a = &f["position"];
let p = BlockPos::new(
a[0].as_i64().unwrap() as i32,
a[1].as_i64().unwrap() as i32,
a[2].as_i64().unwrap() as i32,
);
let root = FluidState::from_json(&f["root"].to_string())?;
if f["mode"].as_str().unwrap() == "flow" {
match fluid_flow::flow_at(&mut w, root, p) {
Ok(v) => writeln!(
w.out,
"flow {:016x} {:016x} {:016x}",
v.x.to_bits(),
v.y.to_bits(),
v.z.to_bits()
)?,
Err(_) => writeln!(w.out, "error")?,
}
} else {
match fluid_flow::solid_face(
&mut w,
root.kind(),
p,
Direction::ALL[f["direction"].as_u64().unwrap() as usize],
) {
Ok(v) => writeln!(w.out, "face {v}")?,
Err(_) => writeln!(w.out, "error")?,
}
}
writeln!(w.out, "queries {}", w.calls)?;
}
Ok(())
}
crates/horizon-world/src/fluid_flow.rs
+108
View File
@@ -0,0 +1,108 @@
//! Neighbor-derived water/lava currents and falling-fluid wall deflection.
use crate::fluid::{FluidKind, FluidState};
use horizon_core::{
geometry::{Direction, Vec3},
position::BlockPos,
};
pub trait FluidFlowWorld {
type Error;
type Block: Copy;
fn fluid(&mut self, position: BlockPos) -> Result<FluidState, Self::Error>;
fn block(&mut self, position: BlockPos) -> Result<Self::Block, Self::Error>;
/// Resolved BLOCKS_FLUID_FLOW tag membership for the captured state.
fn blocks_fluid_flow(&self, state: Self::Block) -> bool;
/// Actual IceBlock class membership, including its subclasses.
fn is_ice_class(&self, state: Self::Block) -> bool;
fn is_face_sturdy(
&mut self,
state: Self::Block,
position: BlockPos,
direction: Direction,
) -> Result<bool, Self::Error>;
}
/// Native wall test reads both block and fluid before any early return. The
/// supplied face is the scan direction, rather than its opposite.
pub fn solid_face<W: FluidFlowWorld>(
world: &mut W,
kind: FluidKind,
position: BlockPos,
direction: Direction,
) -> Result<bool, W::Error> {
let block = world.block(position)?;
let fluid = world.fluid(position)?;
if fluid.kind().same_family(kind) {
return Ok(false);
}
if direction == Direction::Up {
return Ok(true);
}
if world.is_ice_class(block) {
return Ok(false);
}
world.is_face_sturdy(block, position, direction)
}
fn affects_flow(kind: FluidKind, neighbor: FluidState) -> bool {
neighbor.kind() == FluidKind::Empty || neighbor.kind().same_family(kind)
}
const HORIZONTAL: [Direction; 4] = [
Direction::North,
Direction::East,
Direction::South,
Direction::West,
];
/// The height differences and directional products round as f32 before being
/// accumulated in f64. Falling currents normalize before and after the Y push.
pub fn flow_at<W: FluidFlowWorld>(
world: &mut W,
state: FluidState,
position: BlockPos,
) -> Result<Vec3, W::Error> {
if state.kind() == FluidKind::Empty {
return Ok(Vec3::ZERO);
}
let mut x = 0.0;
let mut z = 0.0;
for direction in HORIZONTAL {
let [dx, dy, dz] = direction.normal();
let p = position.offset(dx, dy, dz);
let neighbor = world.fluid(p)?;
if !affects_flow(state.kind(), neighbor) {
continue;
}
let mut height = neighbor.own_height();
let mut difference = 0.0f32;
if height == 0.0 {
let block = world.block(p)?;
if !world.blocks_fluid_flow(block) {
let below = world.fluid(p.offset(0, -1, 0))?;
if affects_flow(state.kind(), below) {
height = below.own_height();
if height > 0.0 {
difference = state.own_height() - (height - 0.8888889f32);
}
}
}
} else if height > 0.0 {
difference = state.own_height() - height;
}
if difference != 0.0 {
x += f64::from(dx as f32 * difference);
z += f64::from(dz as f32 * difference);
}
}
let mut result = Vec3::new(x, 0.0, z);
if state.falling() {
for direction in HORIZONTAL {
let [dx, dy, dz] = direction.normal();
let p = position.offset(dx, dy, dz);
if solid_face(world, state.kind(), p, direction)?
|| solid_face(world, state.kind(), p.offset(0, 1, 0), direction)?
{
result = result.normalize().add_vector(Vec3::new(0.0, -6.0, 0.0));
break;
}
}
}
Ok(result.normalize())
}
crates/horizon-world/src/lib.rs
+1
View File
@@ -25,6 +25,7 @@ pub mod entity_move;
pub mod entity_obstruction;
pub mod fall_damage;
pub mod fluid;
pub mod fluid_flow;
pub mod fluid_occupancy;
pub mod fluid_shape;
pub mod free_space;
docs/collision-geometry.md
+16
View File
@@ -976,3 +976,19 @@ controlled here; neighboring-cell flow calculation, live world/entity binding
and full playable integration remain pending. Extreme-coordinate Java scans are
bounded by injected callback failures rather than allowed to traverse billions
of cells.
`fluid_flow` computes water/lava current vectors from ordered horizontal and
lower neighbors, preserving f32 height subtraction before f64 accumulation.
Falling fluids apply the native wall deflection, including the same-family,
upward-face and IceBlock guards, then normalize the resulting vector.
`python3 tools/test_fluid_flow_parity.py` invokes actual registered
`FluidState.getFlow`, `FlowingFluid.getFlow` and its solid-face helper. The
[fluid flow report](../benchmarks/rust-fluid-flow-2026-10-07/scoped-parity.json)
records **1,051,071 matching lines per JAR** from **51,846 fixtures** covering all
registered fluid states, neighboring families/heights, per-face wall flags,
falling deflection, wrapping coordinates and query failures. Targeted Clippy
passes. Block tag/class flags and face support are controlled in this comparison;
binding those to registered block storage and support shapes, fluid spreading
and complete gameplay remain pending.
mods/horizon/src/test/java/dev/horizonlab/parity/VanillaFluidFlowOracle.java
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package dev.horizonlab.parity;
import com.google.gson.*;import com.mojang.serialization.JsonOps;
import java.io.*;import java.lang.reflect.*;import java.nio.file.*;
import net.minecraft.core.*;import net.minecraft.core.registries.*;import net.minecraft.tags.*;import net.minecraft.world.level.*;import net.minecraft.world.level.block.*;import net.minecraft.world.level.block.state.*;import net.minecraft.world.level.material.*;import net.minecraft.world.phys.*;
/** Native registered fluid current calculation with independently controlled block/fluid neighbors. */
public final class VanillaFluidFlowOracle {
static final class Stop extends RuntimeException {}
static String pos(BlockPos p){return p.getX()+" "+p.getY()+" "+p.getZ();}
static final class Data {JsonObject f;PrintWriter out;int calls;State[] blocks;FluidState[] fluids;
void query(String s){out.println(s);if(calls++==f.get("fail").getAsInt())throw new Stop();}
int cell(BlockPos p){var v=f.getAsJsonObject("cells").get(pos(p));return v==null?f.get("default").getAsInt():v.getAsInt();}
}
static final class State extends BlockState {Data d;int id;
State(Block block){super(block,new net.minecraft.world.level.block.state.properties.Property<?>[0],new Comparable<?>[0]);}
@Override public boolean is(TagKey<Block> tag){if(tag!=BlockTags.BLOCKS_FLUID_FLOW)throw new AssertionError(tag);return d.f.getAsJsonArray("states").get(id).getAsJsonObject().get("blocks_flow").getAsBoolean();}
@Override public boolean isFaceSturdy(BlockGetter w,BlockPos p,Direction face){d.query("sturdy "+pos(p)+" "+face.getSerializedName());return (d.f.getAsJsonArray("states").get(id).getAsJsonObject().get("faces").getAsInt()&(1<<face.ordinal()))!=0;}
}
public static void main(String[] args)throws Exception{
net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();Path dir=Path.of(args[1]);
if(args[0].equals("export")){var states=new JsonArray();for(var fluid:BuiltInRegistries.FLUID)for(var state:fluid.getStateDefinition().getPossibleStates())states.add(FluidState.CODEC.encodeStart(JsonOps.INSTANCE,state).getOrThrow());Files.writeString(dir.resolve("fluid-states.json"),states.toString());return;}
var solid=FlowingFluid.class.getDeclaredMethod("isSolidFace",BlockGetter.class,BlockPos.class,Direction.class);solid.setAccessible(true);
try(var out=new PrintWriter(Files.newBufferedWriter(dir.resolve(args[0]+".txt")));var lines=Files.lines(dir.resolve("inputs.txt"))){for(var line:(Iterable<String>)lines::iterator){var f=JsonParser.parseString(line).getAsJsonObject();var d=new Data();d.f=f;d.out=out;var states=f.getAsJsonArray("states");d.blocks=new State[states.size()];d.fluids=new FluidState[states.size()];for(int i=0;i<states.size();i++){var s=states.get(i).getAsJsonObject();var b=new State(s.get("ice").getAsBoolean()?Blocks.ICE:Blocks.STONE);b.d=d;b.id=i;d.blocks[i]=b;d.fluids[i]=FluidState.CODEC.parse(JsonOps.INSTANCE,s.get("fluid")).getOrThrow();}
var world=(BlockGetter)Proxy.newProxyInstance(BlockGetter.class.getClassLoader(),new Class<?>[]{BlockGetter.class},(proxy,method,values)->{var p=(BlockPos)values[0];switch(method.getName()){case "getBlockState":d.query("block "+pos(p));return d.blocks[d.cell(p)];case "getFluidState":d.query("fluid "+pos(p));return d.fluids[d.cell(p)];default:throw new AssertionError(method);}});
var a=f.getAsJsonArray("position");var p=new BlockPos(a.get(0).getAsInt(),a.get(1).getAsInt(),a.get(2).getAsInt());var root=FluidState.CODEC.parse(JsonOps.INSTANCE,f.get("root")).getOrThrow();
try{if(f.get("mode").getAsString().equals("flow")){var v=root.getFlow(world,p);out.printf("flow %016x %016x %016x%n",Double.doubleToLongBits(v.x),Double.doubleToLongBits(v.y),Double.doubleToLongBits(v.z));}else out.println("face "+solid.invoke(root.getType(),world,p,Direction.values()[f.get("direction").getAsInt()]));}catch(Stop e){out.println("error");}catch(InvocationTargetException e){if(e.getCause() instanceof Stop)out.println("error");else throw e;}
out.println("queries "+d.calls);
}}
}
}
tools/test_fluid_flow_parity.py
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#!/usr/bin/env python3
"""Compare registered fluid current vectors and neighbor queries with vanilla."""
import argparse
import json
import os
from pathlib import Path
import platform
import subprocess
import random
import struct
import math
try:
from . import lab, test_rust_parity as base
except ImportError:
import lab
import test_rust_parity as base
def corpus(states):
empty=next(s for s in states if s['id']=='minecraft:empty')
water=next(s for s in states if s['id']=='minecraft:water' and s['properties']['falling']=='false')
def cell(fluid=empty,blocks=False,ice=False,faces=0):return dict(fluid=fluid,blocks_flow=blocks,ice=ice,faces=faces)
def row(root,entries=None,**kw):
f=dict(mode='flow',root=root,states=entries or [cell()],default=0,cells={},position=[0,0,0],fail=-1,direction=2);f.update(kw);return f
neighbors=[(0,0,-1),(1,0,0),(0,0,1),(-1,0,0)]
for root in states:
for neighbor in states:
for blocks in [False,True]:
yield row(root,[cell(neighbor,blocks),cell(empty,False),cell(water,False)],cells={'0 0 -1':1,'0 -1 -1':2})
for root in states:
for index,p in enumerate(neighbors):
for y in [0,1]:
for mask in range(64):
for ice in [False,True]:
key=f'{p[0]} {y} {p[2]}'
yield row(root,[cell(),cell(empty,False,ice,mask)],cells={key:1})
for root in states[1:]:
for neighbor in [empty,water,states[-1]]:
for direction in range(6):
for ice in [False,True]:
for mask in [0,63,1<<direction]:yield row(root,[cell(neighbor,False,ice,mask)],mode='face',direction=direction)
rng=random.Random(0x464c4f57)
for _ in range(6000):
p=rng.choice([(0,0,0),(17,-64,-33),(2147483647,-2147483648,-2147483648)])
def wrap(v):return (v+2**31)%2**32-2**31
cells={' '.join(str(wrap(a+b)) for a,b in zip(p,(dx,y,dz))):rng.randrange(6) for dx,_,dz in neighbors for y in [-1,0,1]}
yield row(rng.choice(states),[cell(rng.choice(states),bool(rng.randrange(2)),bool(rng.randrange(2)),rng.randrange(64)) for _ in range(6)],cells=cells,position=p,fail=rng.choice([-1,-1,*range(35)]))
for root in states:
for fail in range(-1,35):yield row(root,[cell(),cell(water)],cells={'0 -1 -1':1},fail=fail)
def main():
parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
build=lab.LOCAL/'rust-fluid-flow-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/VanillaFluidFlowOracle.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/fluid_flow_fixture.rs']
tested_sources=base.source_hashes(sources)
classes=build/'classes';classes.mkdir(exist_ok=True)
def run(command,name):
with (build/(name+'.log')).open('w',encoding='utf-8') as log:base.run(list(map(str,command)),stdout=log,stderr=subprocess.STDOUT)
dependency_path=os.pathsep.join(map(str,libraries))
run(['javac','--release',lock['minecraft']['java_major'],'-proc:none','-cp',str(jars['server'])+os.pathsep+dependency_path,'-d',classes,oracle],'compile-java')
def java(side,mode,path):
run(['java','-Xmx512M','-cp',os.pathsep.join([str(classes),str(jars[side]),dependency_path]),'dev.horizonlab.parity.VanillaFluidFlowOracle',mode,path],side+'-'+mode)
java('server','export',build);states=json.loads((build/'fluid-states.json').read_text());fixtures=list(corpus(states));inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
fixture_paths=[inputs,build/'fluid-states.json'];tested_fixtures=base.source_hashes(fixture_paths)
run(['cargo','build','--release','-p','horizon-world','--example','fluid_flow_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'/('fluid_flow_fixture.exe' if os.name=='nt' else 'fluid_flow_fixture')
run([binary,build],'rust');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:,} fluid-flow 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 registered FluidState.getFlow / FlowingFluid.getFlow and solid-face helper over every registered fluid state. Ordered horizontal and downward neighbor reads, fluid families, BLOCKS_FLUID_FLOW tag, IceBlock guard, falling-wall deflection, f32 height differences, vector normalization, wrapping coordinates and injected failures. Block flags and face support are controlled; registry/world support binding, spreading and full gameplay remain pending.'}
lab.write_json(report_path,report);print(f'Scoped fluid flow parity passed: {report_path}')
if __name__=='__main__':main()