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BGM_001.slb is three sub-waves (10 KB, 4.47 MB, 4.67 MB) and the decoder concatenates them into one 347 s track. That is a default nobody chose, not a decision: two near-equal halves could be intro + loop, two variations, or two halves of one piece, and a menu that loops its music needs to know which. Found while wiring the Audio Library up to the shared banks. Recorded in HANDOFF.md as a trap too, so the port does not build looping on top of the concatenated track before the question is answered. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Handoff — what the menu port needs, and where it stands
The single page the port agent reads. Everything here is produced by the container agent's reverse engineering; nothing here is a design decision about the port itself.
Keep it current. It is a summary with links into docs/re/, not a second copy of
the findings — but an answer that is not reachable from this page has not been
delivered.
How to read an answer
Every row below is one of exactly three things, and the distinction is the point:
| meaning | what the port should do | |
|---|---|---|
| decoded | a field on the disc, with a disc-wide check | read it from the data |
| measured | not on the disc in any form we found, but the running game does this | hardcode it, and cite this page |
| undecodable | we looked in these places, it is not there, here is the reach of the negative | author it by hand, knowingly |
There is no fourth kind. If a row says measured or undecodable, the port is authoring that value, not transcribing it — and it should be kept somewhere a human can see it is a human decision, so that when it is later decoded the authored version can be deleted.
Status
| Question | State | Answer / link | |
|---|---|---|---|
| Q1 | keyframe time unit + ramp shape | ❔ open | blocks all animation |
| Q2 | which build is which screen state | 🟡 partial | build 4 title, 5 main menu, 6/8/9 submenus, palogo splash — unconfirmed against captures |
| Q3 | paint order for the six screens | ❔ open | runtime-solved only; declaration table is refuted |
| Q4 | button → GamePart | ❔ open | labels are baked into sprites |
| Q5 | navigation semantics | ❔ open | |
| Q6 | boot sequence + what drives it | 🟡 partial | order observed; the driver is not decoded |
| Q7 | transitions | ❔ open | |
| Q8 | menu audio bindings | ❔ open | cue table complete, event binding is not |
| Q9 | video binding + playback rules | 🟡 partial | ADV.wmv is the boot intro; new-game intro unidentified |
| Q10 | music-bank sub-wave roles (intro+loop?) | ❔ open | we concatenate blindly today |
| S1 | Ready Room go/no-go | ❔ open | probe not run |
Already settled — the port can rely on these today
GP_TITLE.pakis the whole title-side tree. Build 4 is the title with the animating wordmarks, build 5 the five-button main menu, builds 6/8/9 are submenus, and the developer splash is thepalogobundle in the same archive. ✅ decoded (enumeration), 🟡 the state labels are not yet capture-confirmed.- Buttons are identifiable as data. Element kind
0x3002= button,0x0= decoration,0x10= primitive. ✅ decoded. - Menu order is geometric. Buttons sorted top-to-bottom by resting Y. This is
✅ correct for a vertical menu and is not a decoded neighbour graph — the
disc's real navigation structure is unknown, and
optis not a focus link (measured and refuted, seeui-focus-and-effect-elements.md). - Highlighted states pair by name —
ptbtn01.rat↔ptbtn01f.rat. 🟡 a naming convention that holds for all 54 real pairs, not a decoded field. - The resting pose is the hold, not the first, last or longest-dwell keyframe;
a keyframe is the start of a ramp.
ui-resting-pose.md. ✅ - The GamePart id table — 29 entries at
.rdata 0x820A1630, confirmed by the executable's own registration strings. ✅ This is the screen vocabulary; which button reaches which entry is Q4 and is not part of it. - The logo splash is a screen, not a video.
logo1–logo4are manifest-bound with no.wmvon the disc. ✅ - Sprites carry their own labels. No font rendering or localisation is needed for this milestone. ✅
Facts the port will trip over
ADV.wmvis WMV3 video + WMA Pro audio, 1280×720 at 30 fps, 137 s. Godot 4 plays only Ogg Theora natively. How to handle that is the port's decision, not ours — but it is not optional.- The disc holds 3.3 GB of video. Only the boot intro and the one new-game intro are in scope.
Static.slbover-declares its size by 616 768 bytes — it is the highest-offset entry insound.pakand its size field is an allocation size. A reader must allow a short read there and only there.- Voice downmixes to mono, music does not. The left-channel downmix is correct for spoken lines and discards half a music mix.
- A music bank has several sub-waves and we glue them together.
BGM_001is 10 KB + 4.47 MB + 4.67 MB, concatenated into one 347 s track. Nobody has established whether those are intro + loop, two variations, or two halves — see Q10. Do not build menu looping on the concatenated track until it is answered. JNGL_001.slbdoes not decode. One bank in 9 519; its payload is not a whole number of XMA1 packets from any known data offset.
Reference data
Committed alongside the findings, so the port can be built without a disc in the loop during development:
sylpheed-cli screen info --build <n> GP_TITLE.pak— the element table, per build, with pivots, kinds, focus links, keyframes and resting poses.sylpheed-cli screen render— the reference composite. When the port draws a screen, this is what it should be diffed against; where they disagree, one of them is wrong and the disagreement is worth reporting back.docs/re/captures/— framebuffer captures of the real screens, for anything that has to be checked against the game rather than against our renderer.