ReaperOfVeriod
a9e43e39c1
The first typed structure read from real data. Every one of the 27 level containers begins with the same 0x60-byte header, which turns the generic pair table into named assets: data, sound_bank, gameplay and occlusion, plus three chunk descriptors. Two things about this header are worth stating because both are silent failures rather than errors. Sizes here are sector counts, not byte counts. The generic G/ pair table on the same disc uses byte counts, so both readings type-check and the wrong one is off by a factor of 2048. The tiling check settles it: read as sectors, the four extents tile every one of the 27 containers exactly; read as bytes they overlap each other. Level id is not container order. LEVEL21.WAD reports id 30, so a level was cut from the disc and its number left a gap. Anything keying off file order -- a save slot, the planet select screen -- would mislabel that planet. There is also a second trap in the same area: the ISO filesystem sorts names alphabetically, so LEVEL10 precedes LEVEL2, and any tool needing order has to sort numerically. The header's field at 0x04 is zero on all 27 levels. It is not the container size despite looking like one, so the code reads it as a runtime field and takes the container length from the ISO entry instead. Measured across all 27 levels, three invariants now hold in tests: extents tile in file order; extent coverage plus chunks reaches at least the end of the container (21 levels land exactly on its length, 6 leave 134 to 689 sectors of trailing data); and exactly one level's id differs from its container index. The coverage assertion is >= rather than == on purpose -- 21 levels end one sector past the file end because the header occupies sector 0, and asserting equality would truncate a level's tail. gameplay is left unparsed and that is recorded rather than hidden. It begins "WAD" plus a per-level byte and does not decode with the WAD LZ77 decoder: all 27 levels produce plausible output for the first packet and then fail on a rule the format's own encoder never breaks, which means the input is wrong rather than the decoder. docs/plan/level-assets.md records what is ruled out and what to try next. 66 unit tests, plus 7 integration tests against the real disc. The unpack hash table is unchanged, so this adds parsing without altering the pipeline.
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.
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.