b6a4a079f9
tools/port/element-residual turns last iteration's one-off suppression into a tool: pose a screen as verify-capture does, shadow each sprite with a transparent PNG, rank elements by residual on the pixels they actually paint. Two controls, both mandatory -- the metric's zero on identity, and a mod that shadows nothing must move zero pixels, or a footprint is the harness rather than the element. It generalises. Frames rank 1 and 2 on both screens with captures: ptframe1 9.47x and ptframe2 5.46x on main_menu, ptframe3 14.23x and ptframe4 10.46x on extras, all four body-dominated and all four negative. The sign splits, so it is not global darkness: ptmsg +5.02, ptmsg2 +8.83, pttitle +7.88 and every button positive. Refuted my own next hypothesis. Premultiplied alpha decoded as straight alpha predicts error proportional to partial-alpha fraction; the frames are 6.7-7.3 % partial and the most darkened, while pteff10 is 100 % partial and nearly exact. What the frames are: neither has a single fully-opaque pixel, against ptbase's 99.1 %. For a wholly semi-transparent overlay the blend equation decides the result, and alpha-over's shortfall against a background-scaling blend is a*bg. So the shortfall should track the BACKGROUND, not the frame's own contribution. Measured on render, frame-suppressed render and capture, needing no placement: ptframe1 +0.772 vs +0.244, ptframe3 +0.797 vs +0.237. Not adopting anything. The Decoder has established no blend mode is on the disc for .t32 and both frames are kind 0, declared identically to elements drawn almost exactly right, so any blend I pick is authored and that is not mine to take alone. Recorded as an extension of their negative, not a challenge: the behaviour is real and replicated, so if nothing in the data selects it, something in the code does -- the draw path they named as untaken. BLOCKED.md updated: the ask is answered, as a negative.
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
-- and RUNNING.md, which is how you actually start it
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.