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".local/rust-edge-backoff-parity/inputs.txt": "a6175306f75e66a432d74d13a3e489a0a1c046441f66a572ed6880a41a42082b" + }, + "rust_output_sha256": "e116ab9948901cc27a78a82a3a8b5ce171b5f10587e01022d91d8467af656276", + "references": [ + { + "side": "client", + "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d", + "output_sha256": "e116ab9948901cc27a78a82a3a8b5ce171b5f10587e01022d91d8467af656276", + "matched_output_lines": 46578 + }, + { + "side": "server", + "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6", + "output_sha256": "e116ab9948901cc27a78a82a3a8b5ce171b5f10587e01022d91d8467af656276", + "matched_output_lines": 46578 + } + ], + "scope": "Actual Player.maybeBackOffFromEdge, isAboveGround and canFallAtLeast with controlled step/staying/ground getters and ordered collision-free query results. Compares mover and flight guards, fall-distance boundaries, float step widening, exact thin probe bounds, X/Z/diagonal reductions, signed zero/nonfinite inputs and injected query errors. This does not establish live player crouching state, attribute provisioning or integrated registered-world ledge behavior; those need separate integration checks." +} diff --git a/crates/horizon-world/examples/edge_backoff_fixture.rs b/crates/horizon-world/examples/edge_backoff_fixture.rs new file mode 100644 index 0000000000..f12ce44312 --- /dev/null +++ b/crates/horizon-world/examples/edge_backoff_fixture.rs @@ -0,0 +1,117 @@ +use horizon_core::geometry::{Aabb, Axis, Vec3}; +use horizon_world::edge_backoff::{EdgeBackoffInput, EdgeBackoffWorld, back_off_from_edge}; +use serde_json::Value; +use std::{ + fs, + io::{self, Write}, + path::Path, +}; +fn number(v: &Value) -> f64 { + f64::from_bits(u64::from_str_radix(v.as_str().unwrap(), 16).unwrap()) +} +fn vector(v: &Value) -> Vec3 { + Vec3::new(number(&v[0]), number(&v[1]), number(&v[2])) +} +fn bits(v: f64) -> u64 { + if v.is_nan() { + 0x7ff8000000000000 + } else { + v.to_bits() + } +} +struct World<'a> { + input: &'a Value, + out: &'a mut dyn Write, + calls: i64, + probes: usize, +} +impl World<'_> { + fn query(&mut self, text: String) -> io::Result<()> { + writeln!(self.out, "{text}")?; + let call = self.calls; + self.calls += 1; + if call == self.input["fail"].as_i64().unwrap() { + Err(io::Error::other("injected edge query failure")) + } else { + Ok(()) + } + } +} +impl EdgeBackoffWorld for World<'_> { + type Error = io::Error; + fn max_up_step(&mut self) -> io::Result { + self.query("step".into())?; + Ok(f32::from_bits( + u32::from_str_radix(self.input["step"].as_str().unwrap(), 16).unwrap(), + )) + } + fn staying_on_ground_surface(&mut self) -> io::Result { + self.query("staying".into())?; + Ok(self.input["staying"].as_bool().unwrap()) + } + fn on_ground(&mut self) -> io::Result { + self.query("ground".into())?; + Ok(self.input["ground"].as_bool().unwrap()) + } + fn no_collision(&mut self, b: Aabb) -> io::Result { + self.query(format!( + "clear {:016x} {:016x} {:016x} {:016x} {:016x} {:016x}", + bits(b.min(Axis::X)), + bits(b.min(Axis::Y)), + bits(b.min(Axis::Z)), + bits(b.max(Axis::X)), + bits(b.max(Axis::Y)), + bits(b.max(Axis::Z)) + ))?; + let p = self.probes; + self.probes += 1; + Ok(self.input["clear"] + .as_array() + .unwrap() + .get(p) + .and_then(Value::as_bool) + .unwrap_or(false)) + } +} +fn main() -> Result<(), Box> { + 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 b = &f["box"]; + let bounds = Aabb::new( + Vec3::new(number(&b[0]), number(&b[1]), number(&b[2])), + Vec3::new(number(&b[3]), number(&b[4]), number(&b[5])), + ); + let mut world = World { + input: &f, + out: &mut out, + calls: 0, + probes: 0, + }; + let result = back_off_from_edge( + &mut world, + EdgeBackoffInput { + movement: vector(&f["movement"]), + bounds, + flying: f["flying"].as_bool().unwrap(), + self_or_player: matches!(f["mover"].as_str().unwrap(), "SELF" | "PLAYER"), + fall_distance: number(&f["fall"]), + query_budget: 10000, + }, + ); + match result { + Ok(v) => writeln!( + world.out, + "movement {:016x} {:016x} {:016x}", + bits(v.x), + bits(v.y), + bits(v.z) + )?, + Err(_) => writeln!(world.out, "error")?, + }; + writeln!(world.out, "queries {}", world.calls)?; + } + Ok(()) +} diff --git a/crates/horizon-world/src/edge_backoff.rs b/crates/horizon-world/src/edge_backoff.rs new file mode 100644 index 0000000000..7299d8c14e --- /dev/null +++ b/crates/horizon-world/src/edge_backoff.rs @@ -0,0 +1,108 @@ +//! Player crouching edge backoff and its lazy collision-free probes. +use horizon_core::geometry::{Aabb, Vec3}; + +pub trait EdgeBackoffWorld { + type Error; + fn max_up_step(&mut self) -> Result; + fn staying_on_ground_surface(&mut self) -> Result; + fn on_ground(&mut self) -> Result; + fn no_collision(&mut self, bounds: Aabb) -> Result; +} +pub struct EdgeBackoffInput { + pub movement: Vec3, + pub bounds: Aabb, + pub flying: bool, + /// True only for native SELF and PLAYER mover types. + pub self_or_player: bool, + pub fall_distance: f64, + pub query_budget: usize, +} +#[derive(Debug)] +pub enum EdgeBackoffError { + World(E), + QueryBudget, +} +impl std::fmt::Display for EdgeBackoffError { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + match self { + Self::World(e) => e.fmt(f), + Self::QueryBudget => f.write_str("edge backoff collision query budget exhausted"), + } + } +} +impl std::error::Error for EdgeBackoffError {} +fn signum(v: f64) -> f64 { + if v == 0.0 || v.is_nan() { + v + } else { + v.signum() + } +} +fn decrease(v: f64, step: f64) -> f64 { + if v.abs() <= 0.05 { 0.0 } else { v - step } +} +/// The budget bounds pathological/nonconverging motion. Exhaustion is an error, +/// never a successful clamped displacement; earlier provider effects remain. +pub fn back_off_from_edge( + world: &mut W, + input: EdgeBackoffInput, +) -> Result> { + let step = f64::from(world.max_up_step().map_err(EdgeBackoffError::World)?); + if input.flying + || input.movement.y > 0.0 + || !input.self_or_player + || !world + .staying_on_ground_surface() + .map_err(EdgeBackoffError::World)? + { + return Ok(input.movement); + } + let grounded = world.on_ground().map_err(EdgeBackoffError::World)?; + let mut queries = 0usize; + let mut can_fall = + |dx: f64, dz: f64, amount: f64| -> Result> { + if queries == input.query_budget { + return Err(EdgeBackoffError::QueryBudget); + } + queries += 1; + let min = input.bounds.min_position(); + let max = input.bounds.max_position(); + let bounds = Aabb::new( + Vec3::new( + min.x + 1.0e-7 + dx, + min.y - amount - 1.0e-7, + min.z + 1.0e-7 + dz, + ), + Vec3::new(max.x - 1.0e-7 + dx, min.y, max.z - 1.0e-7 + dz), + ); + world.no_collision(bounds).map_err(EdgeBackoffError::World) + }; + if !grounded + && !(input.fall_distance < step && !can_fall(0.0, 0.0, step - input.fall_distance)?) + { + return Ok(input.movement); + } + let mut x = input.movement.x; + let mut z = input.movement.z; + let dx = signum(x) * 0.05; + let dz = signum(z) * 0.05; + while x != 0.0 && can_fall(x, 0.0, step)? { + if x.abs() <= 0.05 { + x = 0.0; + break; + } + x -= dx; + } + while z != 0.0 && can_fall(0.0, z, step)? { + if z.abs() <= 0.05 { + z = 0.0; + break; + } + z -= dz; + } + while x != 0.0 && z != 0.0 && can_fall(x, z, step)? { + x = decrease(x, dx); + z = decrease(z, dz); + } + Ok(Vec3::new(x, input.movement.y, z)) +} diff --git a/crates/horizon-world/src/lib.rs b/crates/horizon-world/src/lib.rs index 3e36221aaa..2fada8379b 100644 --- a/crates/horizon-world/src/lib.rs +++ b/crates/horizon-world/src/lib.rs @@ -15,6 +15,7 @@ pub mod collision; pub mod collision_context; pub mod compression; pub mod dynamic_support; +pub mod edge_backoff; pub mod entity_collision; pub mod entity_obstruction; pub mod fluid; diff --git a/crates/horizon-world/tests/edge_backoff.rs b/crates/horizon-world/tests/edge_backoff.rs new file mode 100644 index 0000000000..501bc625d3 --- /dev/null +++ b/crates/horizon-world/tests/edge_backoff.rs @@ -0,0 +1,62 @@ +use horizon_core::geometry::{Aabb, Vec3}; +use horizon_world::edge_backoff::{ + EdgeBackoffError, EdgeBackoffInput, EdgeBackoffWorld, back_off_from_edge, +}; +struct World { + calls: usize, +} +impl EdgeBackoffWorld for World { + type Error = std::convert::Infallible; + fn max_up_step(&mut self) -> Result { + Ok(0.6) + } + fn staying_on_ground_surface(&mut self) -> Result { + Ok(true) + } + fn on_ground(&mut self) -> Result { + Ok(true) + } + fn no_collision(&mut self, _: Aabb) -> Result { + self.calls += 1; + Ok(true) + } +} +fn input() -> EdgeBackoffInput { + EdgeBackoffInput { + movement: Vec3::new(f64::INFINITY, 0.0, 0.0), + bounds: Aabb::new(Vec3::new(-0.3, 1.0, -0.3), Vec3::new(0.3, 2.8, 0.3)), + flying: false, + self_or_player: true, + fall_distance: 0.0, + query_budget: 3, + } +} +#[test] +fn nonconverging_motion_exhausts_budget_without_successful_displacement() { + let mut world = World { calls: 0 }; + assert!(matches!( + back_off_from_edge(&mut world, input()), + Err(EdgeBackoffError::QueryBudget) + )); + assert_eq!(world.calls, 3); +} +#[test] +fn zero_budget_only_fails_when_a_probe_is_needed() { + let mut world = World { calls: 0 }; + let mut request = input(); + request.query_budget = 0; + request.flying = true; + assert!( + back_off_from_edge(&mut world, request) + .unwrap() + .x + .is_infinite() + ); + let mut request = input(); + request.query_budget = 0; + assert!(matches!( + back_off_from_edge(&mut world, request), + Err(EdgeBackoffError::QueryBudget) + )); + assert_eq!(world.calls, 0); +} diff --git a/docs/collision-geometry.md b/docs/collision-geometry.md index 2c09b5c52d..50b9a06a6f 100644 --- a/docs/collision-geometry.md +++ b/docs/collision-geometry.md @@ -623,3 +623,19 @@ provider failures are covered. Workspace Clippy passes. Null-entity overloads, actual entity-list/border providers and live player ledge behavior remain pending. The [shared movement regression](../benchmarks/rust-world-collision-check-2026-10-07/movement-regression.json) also passes with **7,062,798 matching lines per JAR**. + + +`back_off_from_edge` implements the player ledge guards, above-ground test and +X/Z/diagonal displacement reductions. It retains lazy step/staying/grounded +queries, float step widening, signed-zero behavior and the exact thin collision +probe arithmetic. A caller-supplied query budget bounds nonconverging inputs and +returns an error without fabricating a successful displacement. + +`python3 tools/test_edge_backoff_parity.py` executes actual player methods with +controlled collision-free query results. The +[edge backoff report](../benchmarks/rust-edge-backoff-2026-10-07/scoped-parity.json) +records **46,578 matching lines per JAR**, covering all mover types, flight/crouch +guards, fall/step and 0.05 thresholds, nonfinite values and query failures. Two +query-budget unit tests and workspace Clippy pass. Registered-world ledge probes, +live crouching/attribute state and the complete player movement loop are separate +integration work. diff --git a/mods/horizon/src/test/java/dev/horizonlab/parity/VanillaEdgeBackoffOracle.java b/mods/horizon/src/test/java/dev/horizonlab/parity/VanillaEdgeBackoffOracle.java new file mode 100644 index 0000000000..a3c116891b --- /dev/null +++ b/mods/horizon/src/test/java/dev/horizonlab/parity/VanillaEdgeBackoffOracle.java @@ -0,0 +1,43 @@ +package dev.horizonlab.parity; +import com.google.gson.*; +import java.io.*; +import java.lang.reflect.*; +import java.nio.file.*; +import java.util.*; +import net.minecraft.world.entity.*; +import net.minecraft.world.entity.player.*; +import net.minecraft.world.level.GameType; +import net.minecraft.world.phys.*; +/** Actual Player edge-backoff decisions and probe bounds with controlled collisions. */ +public final class VanillaEdgeBackoffOracle { + static final class Stop extends RuntimeException {} + static double number(JsonElement v){return Double.longBitsToDouble(Long.parseUnsignedLong(v.getAsString(),16));} + static Vec3 vector(JsonElement v){var a=v.getAsJsonArray();return new Vec3(number(a.get(0)),number(a.get(1)),number(a.get(2)));} + static final class Data { + JsonObject input;PrintWriter out;int calls,probes; + void query(String text){out.println(text);if(calls++==input.get("fail").getAsInt())throw new Stop();} + } + static final class Level extends net.minecraft.server.level.ServerLevel { + Data d; + private Level(){super(null,null,null,null,null,null,false,0L,List.of(),false);} + @Override public boolean noCollision(Entity entity,AABB b){d.query(String.format("clear %016x %016x %016x %016x %016x %016x",Double.doubleToLongBits(b.minX),Double.doubleToLongBits(b.minY),Double.doubleToLongBits(b.minZ),Double.doubleToLongBits(b.maxX),Double.doubleToLongBits(b.maxY),Double.doubleToLongBits(b.maxZ)));var values=d.input.getAsJsonArray("clear");int index=d.probes++;return index)lines::iterator){ + var f=JsonParser.parseString(line).getAsJsonObject();var d=new Data();d.input=f;d.out=out;var level=(Level)allocate.invoke(unsafe,Level.class);level.d=d;var entity=(Actor)allocate.invoke(unsafe,Actor.class);entity.d=d;entity.configure(level);var a=new Abilities();a.flying=f.get("flying").getAsBoolean();abilities.set(entity,a);entity.fallDistance=number(f.get("fall"));var b=f.getAsJsonArray("box");entity.setBoundingBox(new AABB(number(b.get(0)),number(b.get(1)),number(b.get(2)),number(b.get(3)),number(b.get(4)),number(b.get(5)))); + try{var result=entity.backoff(vector(f.get("movement")),MoverType.valueOf(f.get("mover").getAsString()));out.printf("movement %016x %016x %016x%n",Double.doubleToLongBits(result.x),Double.doubleToLongBits(result.y),Double.doubleToLongBits(result.z));}catch(Stop error){out.println("error");}out.println("queries "+d.calls); + } + } + } +} diff --git a/tools/test_edge_backoff_parity.py b/tools/test_edge_backoff_parity.py new file mode 100644 index 0000000000..859ea2d7fe --- /dev/null +++ b/tools/test_edge_backoff_parity.py @@ -0,0 +1,72 @@ +#!/usr/bin/env python3 +"""Compare player crouching edge-backoff probes and lazy guards 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('>d',float(v)).hex() + def single(v):return struct.pack('>f',float(v)).hex() + def row(flags=6,mover='SELF',movement=(.3,-.08,.2),step=.6,fall=0,clear=None,fail=-1,bounds=(-.3,1,-.3,.3,2.8,.3)): + return dict(flying=bool(flags&1),staying=bool(flags&2),ground=bool(flags&4),mover=mover,movement=list(map(bits,movement)),step=single(step),fall=bits(fall),clear=clear if clear is not None else [True]*30,fail=fail,box=list(map(bits,bounds))) + for flags in range(8): + for mover in ['SELF','PLAYER','PISTON','SHULKER','SHULKER_BOX']: + for y in [-.1,-0.0,0,.1,float('nan')]: + for fall in [0,.2,.6,1,float('nan')]: + for clear in [[],[False],[True],[False]+[True]*30]:yield row(flags,mover,(.3,y,.2),fall=fall,clear=clear) + values=[-.6,-.1,-math.nextafter(.05,1),-.05,-math.nextafter(.05,0),-1e-9,-0.0,0,1e-9,math.nextafter(.05,0),.05,math.nextafter(.05,1),.1,.6,float('nan'),float('inf')] + for x in values: + for z in values: + for clear in [[],[True]*30,[False,True,False]+[True]*10,[True,False,True,False]+[True]*10]:yield row(movement=(x,-.08,z),clear=clear) + for fail in range(-1,35): + for flags in [0,2,6,7]:yield row(flags=flags,clear=[False]+[True]*40,fail=fail) + rng=random.Random(0x45444745) + for _ in range(6000): + low=[rng.choice([-16,-1,-0.0,0,.1,1,1e8,float('nan')]) for _ in range(3)];high=[v+rng.choice([0,1e-8,.6,1.8]) for v in low] + yield row(flags=rng.randrange(8),mover=rng.choice(['SELF','SELF','PLAYER','PISTON']),movement=[rng.choice(values),rng.choice([-.1,0,.1,float('nan')]),rng.choice(values)],step=rng.choice([0,.5,.6,1,float('nan'),float('inf')]),fall=rng.choice([0,.2,.6,1,float('nan')]),clear=[bool(rng.randrange(2)) for _ in range(50)],fail=rng.choice([-1,-1,0,1,2,3,10]),bounds=(*low,*high)) + + +def main(): + parser=argparse.ArgumentParser(description=__doc__);parser.add_argument('--prepare',action='store_true');args=parser.parse_args() + build=lab.LOCAL/'rust-edge-backoff-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/VanillaEdgeBackoffOracle.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/edge_backoff_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.VanillaEdgeBackoffOracle',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','edge_backoff_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'/('edge_backoff_fixture.exe' if os.name=='nt' else 'edge_backoff_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:,} edge-backoff 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 Player.maybeBackOffFromEdge, isAboveGround and canFallAtLeast with controlled step/staying/ground getters and ordered collision-free query results. Compares mover and flight guards, fall-distance boundaries, float step widening, exact thin probe bounds, X/Z/diagonal reductions, signed zero/nonfinite inputs and injected query errors. This does not establish live player crouching state, attribute provisioning or integrated registered-world ledge behavior; those need separate integration checks.'} + lab.write_json(report_path,report);print(f'Scoped edge backoff parity passed: {report_path}') + + +if __name__=='__main__':main()