Persist vanilla hunger state with native NBT coercions

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Ludovic Marie committed 2026-10-07 04:11:52 +02:00
1 parent 691c2e5b97
commit a3ce4ad17a
7 files changed
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"crates/horizon-world/examples/food_storage_fixture.rs": "fbd3f05d9720a83d2e9de31d67440054189f1ed9e9faeaf4383188cfd43a2cc8"
},
"fixtures_sha256": {
".local/rust-food-storage-parity/inputs.txt": "df6067c6a781554ed5a57e92543bf7acea9e55fc25e5435ddc10fcd58e46436d"
},
"rust_output_sha256": "df9e3d7ca5293c11fcddb814bd84683135a168b4efb789ec6496e1158dfb3db4",
"references": [
{
"side": "client",
"jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
"output_sha256": "df9e3d7ca5293c11fcddb814bd84683135a168b4efb789ec6496e1158dfb3db4",
"matched_output_lines": 45955
},
{
"side": "server",
"jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
"output_sha256": "df9e3d7ca5293c11fcddb814bd84683135a168b4efb789ec6496e1158dfb3db4",
"matched_output_lines": 45955
}
],
"scope": "Actual FoodData readAdditionalSaveData/addAdditionalSaveData through native TagValueInput/TagValueOutput; all NBT numeric types, missing/wrong-type defaults, numeric coercion, overflow, nonfinite values, signed-zero normalization, output types and round trips. Other player fields retained. ProblemReporter diagnostics, complete player save lifecycle and playable integration remain pending."
}
@@ -0,0 +1,114 @@
use horizon_world::{
food::FoodData,
nbt::{Compound, Tag},
};
use serde_json::Value;
use std::{
fs,
io::{self, Write},
path::Path,
};
const KEYS: [&str; 4] = [
"foodLevel",
"foodTickTimer",
"foodSaturationLevel",
"foodExhaustionLevel",
];
fn single(v: &Value) -> f32 {
f32::from_bits(u32::from_str_radix(v.as_str().unwrap(), 16).unwrap())
}
fn bits(v: f32) -> u32 {
if v.is_nan() {
f32::NAN.to_bits()
} else {
v.to_bits()
}
}
fn tag(v: &Value) -> Option<Tag> {
let value = &v["value"];
Some(match v["type"].as_i64().unwrap() {
0 => return None,
1 => Tag::Byte(value.as_i64().unwrap() as i8),
2 => Tag::Short(value.as_i64().unwrap() as i16),
3 => Tag::Int(value.as_i64().unwrap() as i32),
4 => Tag::Long(value.as_str().unwrap().parse().unwrap()),
5 => {
let f = single(value);
Tag::Float(if f == 0.0 { 0 } else { f.to_bits() })
}
6 => {
let f = f64::from_bits(u64::from_str_radix(value.as_str().unwrap(), 16).unwrap());
Tag::Double(if f == 0.0 { 0 } else { f.to_bits() })
}
7 => Tag::ByteArray(vec![1]),
8 => Tag::String("17".into()),
9 => Tag::List(vec![]),
10 => Tag::Compound(Compound::new()),
11 => Tag::IntArray(vec![2]),
12 => Tag::LongArray(vec![3]),
_ => panic!("tag type"),
})
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let arg = std::env::args().nth(1).unwrap();
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 mut food = FoodData {
food: -9,
saturation: -7.,
timer: 83,
exhaustion: 99.,
};
if f["mode"] == "read" {
let mut t = Compound::new();
for (key, v) in KEYS.iter().zip(f["tags"].as_array().unwrap()) {
if let Some(v) = tag(v) {
t.insert((*key).into(), v);
}
}
food.read_nbt(&t);
} else {
food = FoodData {
food: f["food"].as_i64().unwrap() as i32,
timer: f["timer"].as_i64().unwrap() as i32,
saturation: single(&f["saturation"]),
exhaustion: single(&f["exhaustion"]),
};
}
writeln!(
out,
"state {} {} {:08x} {:08x}",
food.food,
food.timer,
bits(food.saturation),
bits(food.exhaustion)
)?;
let mut saved = Compound::new();
saved.insert("unrelated".into(), Tag::Int(42));
saved.insert("foodLevel".into(), Tag::String("replace".into()));
food.write_nbt(&mut saved);
let Tag::Int(unrelated) = saved[&"unrelated".into()] else {
panic!("preserve unrelated")
};
writeln!(out, "saved {} {unrelated}", saved.len())?;
for key in KEYS {
match saved[&key.into()] {
Tag::Int(v) => writeln!(out, "tag 3 {v}")?,
Tag::Float(v) => writeln!(out, "tag 5 {:08x}", bits(f32::from_bits(v)))?,
_ => panic!("saved type"),
}
}
food.read_nbt(&saved);
writeln!(
out,
"roundtrip {} {} {:08x} {:08x}",
food.food,
food.timer,
bits(food.saturation),
bits(food.exhaustion)
)?;
}
Ok(())
}
+47
View File
@@ -0,0 +1,47 @@
//! FoodData fields in a vanilla player NBT compound.
use crate::{
food::FoodData,
nbt::{Compound, JavaString, Tag},
};
fn int(tag: Option<&Tag>, default: i32) -> i32 {
match tag {
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(v)) => f32::from_bits(*v).floor() as i32,
Some(Tag::Double(v)) => f64::from_bits(*v).floor() as i32,
_ => default,
}
}
fn float(tag: Option<&Tag>, default: f32) -> f32 {
match tag {
Some(Tag::Byte(v)) => f32::from(*v),
Some(Tag::Short(v)) => f32::from(*v),
Some(Tag::Int(v)) => *v as f32,
Some(Tag::Long(v)) => *v as f32,
Some(Tag::Float(v)) => f32::from_bits(*v),
Some(Tag::Double(v)) => f64::from_bits(*v) as f32,
_ => default,
}
}
impl FoodData {
/// Missing or nonnumeric values reset each field to its native default.
/// Numeric values are converted without clamping the resulting food state.
pub fn read_nbt(&mut self, tag: &Compound) {
let get = |s: &str| tag.get(&JavaString::from(s));
self.food = int(get("foodLevel"), 20);
self.timer = int(get("foodTickTimer"), 0);
self.saturation = float(get("foodSaturationLevel"), 5.0);
self.exhaustion = float(get("foodExhaustionLevel"), 0.0);
}
/// Writes these four fields while preserving other player data. Java float
/// tag factories normalize both signed zeros to the shared positive zero.
pub fn write_nbt(&self, tag: &mut Compound) {
let float = |v: f32| Tag::Float(if v == 0.0 { 0 } else { v.to_bits() });
tag.insert("foodLevel".into(), Tag::Int(self.food));
tag.insert("foodTickTimer".into(), Tag::Int(self.timer));
tag.insert("foodSaturationLevel".into(), float(self.saturation));
tag.insert("foodExhaustionLevel".into(), float(self.exhaustion));
}
}
+1
View File
@@ -32,6 +32,7 @@ pub mod fluid_flow;
pub mod fluid_occupancy;
pub mod fluid_shape;
pub mod food;
pub mod food_storage;
pub mod free_space;
pub mod ground_support;
pub mod heightmap;
+16
View File
@@ -1149,3 +1149,19 @@ sequences, threshold boundaries, all difficulties, callback mutation/failure,
signed zero and nonfinite arithmetic. Targeted Clippy passes. World rules,
player health/healing and damage delivery are controlled; consumables, saved
hunger data and live survival gameplay integration remain pending.
`food_storage` reads/writes hunger state in player NBT compounds. Missing and
nonnumeric fields use native defaults; numeric tags retain vanilla coercions,
including floor-to-int for floats/doubles, truncation of long integer bits and
no post-load clamping. Writes replace the four hunger fields with native int/
float types, normalize float signed zero and preserve unrelated player fields.
`python3 tools/test_food_storage_parity.py` compares actual `FoodData` persistence
through `TagValueInput`/`TagValueOutput`. The
[food storage report](../benchmarks/rust-food-storage-2026-10-07/scoped-parity.json)
records **45,955 matching lines per JAR**, covering every NBT numeric type,
missing/wrong-type fields, conversion boundaries, nonfinite values and save/load
round trips. Targeted Clippy passes. ProblemReporter diagnostics and the complete
player save lifecycle remain pending; these results establish the four hunger
fields, not a playable save/load implementation.
@@ -0,0 +1,24 @@
package dev.horizonlab.parity;
import com.google.gson.*;import java.io.*;import java.lang.reflect.*;import java.nio.file.*;
import net.minecraft.nbt.*;import net.minecraft.world.food.FoodData;import net.minecraft.world.level.storage.*;import net.minecraft.util.ProblemReporter;
/** Native TagValueInput/Output hunger persistence and numeric coercions. */
public final class VanillaFoodStorageOracle {
static final String[] KEYS={"foodLevel","foodTickTimer","foodSaturationLevel","foodExhaustionLevel"};
static String bits(float v){return String.format("%08x",Float.floatToIntBits(v));}
static float single(JsonElement v){return Float.intBitsToFloat(Integer.parseUnsignedInt(v.getAsString(),16));}
static Tag tag(JsonObject o){int type=o.get("type").getAsInt();var v=o.get("value");return switch(type){
case 1->ByteTag.valueOf(v.getAsByte());case 2->ShortTag.valueOf(v.getAsShort());case 3->IntTag.valueOf(v.getAsInt());case 4->LongTag.valueOf(Long.parseLong(v.getAsString()));
case 5->FloatTag.valueOf(single(v));case 6->DoubleTag.valueOf(Double.longBitsToDouble(Long.parseUnsignedLong(v.getAsString(),16)));
case 7->new ByteArrayTag(new byte[]{1});case 8->StringTag.valueOf("17");case 9->new ListTag();case 10->new CompoundTag();case 11->new IntArrayTag(new int[]{2});case 12->new LongArrayTag(new long[]{3});default->throw new AssertionError();};}
static Field field(String n)throws Exception{var f=FoodData.class.getDeclaredField(n);f.setAccessible(true);return f;}
public static void main(String[] args)throws Exception {
net.minecraft.SharedConstants.tryDetectVersion();net.minecraft.server.Bootstrap.bootStrap();Path dir=Path.of(args[1]);var exhaustion=field("exhaustionLevel");var timer=field("tickTimer");
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 food=new FoodData();food.setFoodLevel(-9);food.setSaturation(-7);timer.setInt(food,83);exhaustion.setFloat(food,99);
if(f.get("mode").getAsString().equals("read")){var compound=new CompoundTag();var tags=f.getAsJsonArray("tags");for(int i=0;i<4;i++){var t=tags.get(i).getAsJsonObject();if(t.get("type").getAsInt()!=0)compound.put(KEYS[i],tag(t));}food.readAdditionalSaveData(TagValueInput.create(ProblemReporter.DISCARDING,net.minecraft.core.HolderLookup.Provider.create(java.util.stream.Stream.empty()),compound));}
else {food.setFoodLevel(f.get("food").getAsInt());food.setSaturation(single(f.get("saturation")));timer.setInt(food,f.get("timer").getAsInt());exhaustion.setFloat(food,single(f.get("exhaustion")));}
out.println("state "+food.getFoodLevel()+" "+timer.getInt(food)+" "+bits(food.getSaturationLevel())+" "+bits(exhaustion.getFloat(food)));
var output=TagValueOutput.createWithoutContext(ProblemReporter.DISCARDING);output.putInt("unrelated",42);output.putString("foodLevel","replace");food.addAdditionalSaveData(output);var saved=output.buildResult();out.println("saved "+saved.size()+" "+saved.getIntOr("unrelated",-1));for(var key:KEYS){var t=(NumericTag)saved.get(key);out.println("tag "+t.getId()+" "+(t instanceof IntTag?Integer.toString(t.intValue()):bits(t.floatValue())));}
food.readAdditionalSaveData(TagValueInput.create(ProblemReporter.DISCARDING,net.minecraft.core.HolderLookup.Provider.create(java.util.stream.Stream.empty()),saved));out.println("roundtrip "+food.getFoodLevel()+" "+timer.getInt(food)+" "+bits(food.getSaturationLevel())+" "+bits(exhaustion.getFloat(food)));
}}
}
}
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#!/usr/bin/env python3
"""Compare vanilla food NBT persistence and numeric conversions 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():
def bits(v):return struct.pack('>f',v).hex()
def double(v):return struct.pack('>d',v).hex()
pool=[dict(type=i,value=0) for i in [0,7,8,9,10,11,12]]
for t,values in [(1,[-128,-1,0,1,127]),(2,[-32768,-129,-1,0,1,32767]),(3,[-2**31,-1,0,1,20,2**31-1]),(4,[-2**63,-2**32-1,-2**31,-1,0,1,2**31,2**32+1,2**63-1])]:
pool.extend(dict(type=t,value=str(v) if t==4 else v) for v in values)
values=[-float('inf'),-1e30,-2147483649.,-1.9,-1.,-0.,0.,1e-40,.1,1.,1.9,20.,2147483647.,2147483648.,1e30,float('inf'),float('nan')]
pool.extend(dict(type=t,value=(bits(v) if t==5 else double(v))) for t in [5,6] for v in values)
pool.extend([dict(type=5,value='7fa12345'),dict(type=6,value='7ff123456789abcd')])
for slot in range(4):
for item in pool:
tags=[dict(type=0,value=0) for _ in range(4)];tags[slot]=item;yield dict(mode='read',tags=tags)
rng=random.Random(0x464f4f444e4254)
for _ in range(6000):yield dict(mode='read',tags=[rng.choice(pool) for __ in range(4)])
for a in values:
for b in values:yield dict(mode='write',food=rng.choice([-2**31,-1,0,20,2**31-1]),timer=rng.choice([-2**31,-1,0,79,2**31-1]),saturation=bits(a),exhaustion=bits(b))
def main():
parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args()
build=lab.LOCAL/'rust-food-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/VanillaFoodStorageOracle.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/food_storage_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.VanillaFoodStorageOracle',mode,path],side+'-'+mode)
fixtures=list(corpus());inputs=build/'inputs.txt';inputs.write_text(''.join(json.dumps(value,separators=(',',':'))+'\n' for value in fixtures),encoding='utf-8')
fixture_paths=[inputs];tested_fixtures=base.source_hashes(fixture_paths)
run(['cargo','build','--release','-p','horizon-world','--example','food_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'/('food_storage_fixture.exe' if os.name=='nt' else 'food_storage_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:,} food storage 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 FoodData readAdditionalSaveData/addAdditionalSaveData through native TagValueInput/TagValueOutput; all NBT numeric types, missing/wrong-type defaults, numeric coercion, overflow, nonfinite values, signed-zero normalization, output types and round trips. Other player fields retained. ProblemReporter diagnostics, complete player save lifecycle and playable integration remain pending.'}
lab.write_json(report_path,report);print(f'Scoped food storage parity passed: {report_path}')
if __name__=='__main__':main()