05c4b58151
The Decoder captured the Japanese title at rest (310bf86) without comparing it to
either renderer, keeping my diff independent.
Alignment recovered, not inherited: row/column profile correlation with the
English pair as control gives (0,0) for the control and dy=-45 for the JP frame --
their stated offset, measured. My first look said 'no letterbox, content spans all
720 rows', which was true and irrelevant.
The instrument is fair: on a control strip where both renderers agree they tie
(r 0.9751 vs 0.9756). In the disputed 350x396 block at (405,74) the REFERENCE is
closer -- r +0.8727 against the port's +0.7462 -- and the verdict is stable under
gamma compensation at both measured title gammas. The port puts light on 25.6% of
the block the capture does not have, against the reference's 15.9%.
This is the opposite of what I expected: the burst the Decoder describes IS
there, and the port draws more of it than the game does. A qualitative match on
'is the effect present' was about to stand in for a measurement of how much.
Not settled: which change did it. Both render at rest t=10 so the settle window is
not in play; four commits touched that path and I have not bisected them.
title_jp's DIFFERS is now known to be the port's -- the first baseline row whose
direction has been established against a capture.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
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.