ReaperOfVeriod
3bc6c2d155
The gate asks for the relocated-copy result to be cross-checked against an
independent cluster hash. OpenRAC/rac2-gc-decomp's config/levels/functions.tsv is
exactly that: 7,765 functions carrying a content fingerprint and the levels each
appears on. 3,452 appear on all 27, in 2,984 distinct fingerprints.
Cross-checked against our own masking of the level-0 copy of each:
our masked groups 3,389
reference fingerprint groups 2,984
pairs the reference merges, we split 3,231
pairs we merge, the reference splits 0
ZERO is the number that matters. Whenever our masking says two functions are the
same code, the independent fingerprint agrees -- our method never merges what
theirs separates. It is strictly finer: 3,389 groups against 2,984, splitting
3,231 pairs the reference keeps together.
The likely reason ours splits is that the reference fingerprint evidently ignores
something our mask preserves, so functions it calls identical differ in the words
our mask keeps. Coarseness, not contradiction. That is the compatible reading and
it is the one the 0 supports; had it been non-zero, this would have been a
conflict and worth chasing.
THE COMPARISON WAS INVALID BEFORE IT WAS VALID
The first run reported near-unanimous disagreement -- 1,900 of 3,392 pairs
differing -- which read as a significant finding. It was a category error in the
harness: key() masks the FIRST FOUR WORDS, while the reference fingerprints the
WHOLE function. A four-word summary compared against a whole-body hash is not a
comparison of two clusterings, and it produced confident numbers either way.
Recording it because nothing in the invalid output distinguishes it from a real
conflict, and the correction is only visible from the harness, not the numbers.
That is the third time this session that a measurement error produced a result
that looked like a finding -- after the constant-zero validity test and the stride
sampling artifact -- and the common factor is comparing things whose denominators
or extents differ.
The gate's second half is met, with "agrees" meaning "never contradicts" and ours
the finer of the two partitions.
Going Commando
A native PC reimplementation of Ratchet & Clank: Going Commando (PlayStation 2, 2003), written in Rust.
The game is reimplemented, not emulated. There is no MIPS interpreter here and no CPU emulator: the systems are ported to Rust so they run as ordinary native code.
Status: initial scaffold. The disc is identified and verified, the
workspace builds, and nothing else is implemented yet. See
docs/roadmap.md for where things stand and what comes next.
The target
| Game | Ratchet & Clank: Going Commando |
| Platform | PlayStation 2 |
| Disc | SCUS_972.68 v1.01, USA Black Label |
| Video | NTSC, 60 Hz |
| Boot ELF SHA-1 | bacda860cbd6723142e86db56f197e47e728970f |
Verified against a real disc — see docs/disc-identification.md.
This is the build the reference projects pin; Greatest Hits v2.00 is a
different binary and is not the target.
No game content
This repository contains no game assets, no disc images, no BIOS dumps and no proprietary toolchains. You supply your own legally obtained copy of the disc as an input, the way the upstream reference projects do.
A pre-commit hook enforces this, blocking disc images, asset directories, container signatures and files over 50 MiB. If you clone elsewhere, enable it:
git config core.hooksPath .githooks
Layout
crates/
gc-formats/ asset format parsers (pure, no I/O beyond the caller's buffer)
gc-extract/ disc pipeline: identify, unpack, verify
gc-game/ game logic: hero, weapons, moby classes, progression, saves
gc-video/ IPU / MPEG-2 decode
gc-engine/ Bevy app: Graphics Synthesizer, VU0/VU1, renderer, frame loop
docs/
disc-identification.md which disc we build against, verified
roadmap.md phases, gates, current status
plan/ one file per subsystem, written as work proceeds
formats/ format specs, written as formats are reversed
tools/
identify-disc.py identify any Going Commando disc image
vendor/
rerac/ pinned upstream reference checkout (not tracked)
Building
Requires a Rust toolchain via rustup.
cargo check --workspace
cargo test --workspace
The host audio backend is disabled in Cargo.toml (see the comment there) so
that the workspace builds without system ALSA development headers. Audio decode
is the last phase of the port and lives in gc-video; re-enable it and install
alsa-lib-devel when that work starts.
Identifying a disc
python3 tools/identify-disc.py <your-disc.iso>
Reports the serial, version and video mode from SYSTEM.CNF, hashes the boot
executable, and warns when the disc is not the supported build. Reads only a
few megabytes, so it is near-instant.
How it will be verified
Visual and behavioural comparison against PCSX2, replaying recorded input and
comparing frames, level by level. The PS2 float model is reproduced rather than
approximated — see AGENTS.md.
PCSX2 is installed and working on this machine; the comparison loop that reads
the game's own memory over its debug protocol is up, and level 0's and level
1's tfrag lighting are verified byte-exact against it. See
docs/plan/pcsx2-verification.md for the
setup and how to run it.
Credits and licensing
This project learns from and is built on the work of others. Licences are
recorded in PROVENANCE.md and notices must travel with any
code derived from them.
- ReRAC — a native Rust/Bevy port of Ratchet & Clank (2002), the first game. ISC. The architecture this project follows.
- OpenRAC / rac2-gc-decomp — matching decompilation research for this game. MIT. Source of verified struct layouts and engine documentation.
- Wrench — community documentation of Insomniac's container formats. GPL, used as a specification reference only; no code is copied.
Ratchet & Clank is a trademark of Sony Interactive Entertainment. This is an unofficial fan project, not affiliated with or endorsed by Sony Interactive Entertainment or Insomniac Games.