3e578882c2
THREE THINGS FROM THE DECODER, one of which I am not taking. REFUTED: "the developer splash is one composited quad, the bounding box of the three logos". The observed quad is 525x259 at (378,155). The three logos' bounding box is 500x421 at (390,164) -- a 259-tall quad CANNOT contain them, and palogo_anima alone starts at y=449, thirty-five pixels below that quad's bottom edge. The observed quad matches the union of gamearts_eff and seta_eff, 521x261 at (379,154), to about four pixels in every dimension -- and both of those are TRANSIENTS my own census flagged, dark by t=45, so a frame containing that quad is a build-in frame rather than the settled screen. I cannot see their draw stream, so I sent the arithmetic rather than a verdict, and the port keeps drawing three: I will not stop drawing an element on a claim whose stated identification excludes that element from its own bounding box. THE BLACK HOLD IS 9 UNITS, NOT 12. I authored 12 from Q7's luminance plateau of 0.17-0.23 s, supported by the menus' transition quad. The Decoder counted SUBMITTED QUADS instead -- luminance cannot separate the outgoing fade's tail from true black. Four frames with no sprite quad at all, at 2.284 units/frame derived from the disc as its own clock, gives 9.1 units = 0.152 s (6.9-11.4). That overlaps the luminance figure only at the top, and the true black is SHORTER still since both boundary frames carry picture. My 12 was supported by analogy -- a different screen's quad on a different path -- and a number that fits by analogy loses to one measured in place. verify-dwell's bound moved with it; both screens still agree. THE TITLE'S SWEEPS LOOP. The oracle shows the quad oscillating over its whole x range and resetting hard, one reset in the first title dwell and two in the second. The loop-length field could NOT have settled it, correcting a hope I had stated: both records declare exactly their last keyframe time, slack zero, and "loops at 600" and "runs once for 600 and stops" write the identical header. Verified on the two sweeps' LCM, since their periods differ: 600 and 720 realign at 3600 units, mean diff 0, against 0.438 at half that. Scoped to the title. The menus declare the same lengths but the oracle measurement is of the title, and my own weak evidence points the other way there -- best match with the sweeps off-screen, three times worse mid-screen, against a 73% on-screen duty cycle if they looped. Two weak signals in opposite directions is a reason to scope, not to pick. 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.