18f3c5d3dd
sylpheed-port found the fifth member of our error family on their own side: their "visible" test counted any element with alpha > 0, which includes palogo_eff0. Verified from the disc rather than accepted -- entry 10 [0] palogo_eff0.prm 1 kf t=0 fade=0xff000000 scale=100x100 pos=(0,0) entry 11 same Alpha 255 over RGB 000000: full-screen opaque black, drawn from t=0 and showing nothing. So "any element drawn" reports these screens visible from t=0 while the frame is black -- "visible" read as "drawn". Worth having on its own: this verifies from the disc the premise behind `screen render --black`, which its own help states as "what the game composites over on a screen carrying its own background". On the splash builds that background is DECLARED, not assumed. METHOD gains their amendment, which is the sharpest formulation either of us reached this week: all five instances are a failure of a NOUN, not of a number. Extent, bounding box, duration, span, visible. The number was always correct FOR SOMETHING; what went missing was which thing. Every other check in that file tests whether a number is right, and not one tests whether it is a number of the thing you think. Also teaches fade_quads.py to address a PAK ENTRY directly (`e10`) rather than only a build ordinal. The splashes are entries 10/11 and are not screen builds, so no ordinal addresses them -- and writing `e10` states which index space is meant, which is the standing lesson of build-ordinal-vs-entry.md. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
Sylpheed
A clean-room reverse engineering and port project for Project Sylpheed: Arc of Deception (Xbox 360, 2007).
Three things live here, in one repository so that a change spanning them lands as one commit:
| The decoders | crates/sylpheed-formats — the disc's formats, read and verified disc-wide |
| The port | port/ — a Godot 4 project, plus crates/sylpheed-export which converts a disc into the open asset tree it reads |
| The corpus | docs/re/ — what has been reverse engineered, with its evidence, its retractions and its dead ends |
You need your own copy of the game. No game content is in this repository and none ever will be. The exporter reads the disc you supply.
The oracle is the real game
sylpheed-cliand the Explorer are tools for verifying our decoding. They are hypotheses under test and they have been wrong. When something must be checked against the truth, the truth is the game running in Xenia Canary, captured — not any renderer of ours.
This is stated first because getting it backwards is the most expensive mistake this project has made.
Layout
crates/
sylpheed-formats/ the decoders. Disc-wide verified; the corpus is its spec
sylpheed-cli/ headless tools -- render a screen, dump a table, probe audio
sylpheed-viewer/ the Explorer: a human's window onto the disc. STATIC data only
sylpheed-export/ disc -> the open, moddable asset tree
port/ the Godot 4 project. Reads open formats ONLY
authored/ decisions that are NOT on the disc, each with its reason
data/
base/ generated by the exporter. Gitignored, never hand-edited
mods/ drop-in overrides. Yours
docs/
re/ the corpus: findings, refutations, method traps
game/ how the game is navigated -- menus, modals, flight
port/ the port's mission, its handoff contract, modding rules
agents/ how the agent team works together
tools/ capture harnesses, probes, the share tool
exchange/ transient inter-agent files. NOT in git
docker/ the agent containers
Where to start
docs/re/INDEX.md— what is decodeddocs/re/REFUTED.md— what has been tested and dieddocs/re/METHOD.md— traps this project has already paid fordocs/game/navigation.md— how the game is navigateddocs/port/MODDING.md— why the asset tree looks the way it does
Xenia Canary is a separate repository: it is a fork tracking upstream, and it carries our instrumentation.
Conventions
Confidence is per claim, never per document: ✅ CONFIRMED · 🟡 PROBABLE ·
❔ HYPOTHESIS · ❌ REFUTED. A withdrawn result is kept with its reasoning
rather than deleted — that is why the numbers here can be trusted.