ReaperOfVeriod
36d8d2b00c
Redone through overlay_bytes_at, the verified flat mapping:
functions kept 2,313
moby_classes 0x00c0 391 (displaced: 394)
best neighbour (0x00c8) 15 (displaced: 4)
bucket n 0xc0 best neighbour ratio (displaced)
0-15 1,033 73 2 36.5x 72.0x
16-31 759 118 4 29.5x 29.8x
32-47 283 89 2 44.5x 34.7x
48-63 118 41 3 13.7x 19.5x
64-79 55 32 2 16.0x 15.5x
80-95 37 22 2 11.0x 13.0x
The reason it survives is worth stating, because it separates the two results. The
displacement was uniform -- every window shifted by the same amount -- so a
function's contents barely changed, and a frequency count over a window is robust
to that. A disassembly is not: it depends on the exact byte alignment, which is
what was wrong. Hence 394 becoming 391 with the same shape, while the 0x3a8060
walk and the 16-byte stride evaporated entirely.
So the investigation was not "all wrong". Precisely:
- the frequency enrichment is real, now on verified bytes, with a test that fails
if it goes;
- the disassembly was never real, and the whole jal chain built on it is retracted;
- no loader has been located, and 0x2ee138 is VU microcode.
THE LESSON IS ABOUT WHICH MEASUREMENTS SURVIVE A MISTAKE
A count over a window tolerates a constant displacement. A decode does not. Sixteen
probes leaned on the kind that does not tolerate it, and reported each with the
same confidence as the kind that does. Nothing about the numbers distinguished them
at the time -- that is the whole difficulty, and why the verification in cd16485
was the missing step rather than a formality.
Next: the ~391 functions are a legitimate shortlist, but consuming them means
disassembly through tools/overlay-anchors, whose output is now checked against a
word the build pins.
286 passing with the disc present (23 + 19 + 66 + 156 + 22; disc binary 34.89s),
clippy clean.
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.