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re: which GP_TITLE build is which screen, measured against the game

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Q2. The archive is eight screens shipped twice, English and Japanese --
not the "build 4 title, 5 main menu, 6/8/9 submenus" the handoff claimed.
Build 8 is the JAPANESE main menu; 6 and 9 are the EN and JP EXTRAS, and
EXTRAS is the only submenu GP_TITLE holds. The PRESS (A) BUTTON plate is
its own build (2/3), composited over the title art and faded in a beat
later, not a state of build 4.

Confirmed by booting to the main menu and walking it: title, PRESS (A),
main menu and EXTRAS each match their render element for element. Builds
0/1 and 10/11 -- a DELTASABER / SYLPHEED A.I. plate -- were looked for in
the whole boot filmstrip, every title-side screen and the attract loop,
and appear in none of them; the reach of that negative is written down
rather than filled in with a guess.

Two rig traps went into METHOD: the menus drop d-pad presses shorter than
~0.3 s, and a grab 2.5 s after a transition can catch a screen mid-fade
-- which nearly wrote "the returned title has no plate" into the corpus.
This commit is contained in:
Sylpheed RE agent
2026-08-28 16:55:33 +00:00
parent 27e8c51978
commit 88b3ce9af5
11 changed files with 144 additions and 7 deletions
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docs/port/HANDOFF.md
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@@ -28,11 +28,11 @@ authored version can be deleted.
| | Question | State | Answer / link |
|---|---|---|---|
| Q1 | keyframe time unit + ramp shape | ✅ answered | ramp is **linear**; the clock advances **2 units per rendered frame**; working conversion **1 unit = 1/60 s** — [`ui-keyframe-time-unit.md`](../re/ui-keyframe-time-unit.md) |
| Q2 | which build is which screen state | 🟡 partial | build 4 title, 5 main menu, 6/8/9 submenus, `palogo` splash — unconfirmed against captures |
| Q2 | which build is which screen state | ✅ answered | `GP_TITLE` is **8 screens shipped twice, EN/JP**: 4/7 title art, 2/3 the `PRESS Ⓐ` plate, 5/8 main menu, 6/9 `EXTRAS`, 0/1 and 10/11 two unidentified `DELTASABER` plates — [`ui-title-build-map.md`](../re/ui-title-build-map.md) |
| 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 |
| Q6 | boot sequence + what drives it | 🟡 partial | order observed, and the **attract cycle is timed**: ~8–10 s idle on the title → fade to black → ~85 s of video → title again, plate and all. The driver is still 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 |
@@ -41,10 +41,19 @@ authored version can be deleted.
## Already settled — the port can rely on these today
* **`GP_TITLE.pak` is 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 the `palogo` bundle in the same archive.
✅ decoded (enumeration), 🟡 the state labels are not yet capture-confirmed.
* **`GP_TITLE.pak` is eight screens, each shipped twice — English and Japanese.**
Build 4 is the English title art and 7 its Japanese twin; **2/3 are the
`PRESS Ⓐ BUTTON` plate, a build of their own** composited over the title and
faded in a beat later; 5/8 are the five-button main menu; 6/9 are the `EXTRAS`
submenu — the **only** submenu inside this archive. Builds 0/1 and 10/11 are a
`DELTASABER / SYLPHEED A.I.` plate that was **never seen running**, in the boot
path, any title-side screen, or the attract loop. ✅ measured against live
captures for the four English screens the boot path shows;
[`ui-title-build-map.md`](../re/ui-title-build-map.md).
**Withdrawn:** the earlier "builds 6/8/9 are submenus" — 8 is the Japanese main
menu. The other four main-menu buttons leave the archive (`GP_SAVE_LOAD`,
`GP_TUTORIAL`, `GP_OPTIONS`, `GP_MISSION_SELECT` are the likely destinations by
name — an inference, not a measurement).
* **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
@@ -73,7 +82,8 @@ authored version can be deleted.
* **The logo splash is a screen, not a video.** `logo1`–`logo4` are
manifest-bound with no `.wmv` on the disc. ✅
* **Sprites carry their own labels.** No font rendering or localisation is needed
for this milestone. ✅
for this milestone. ✅ — and the localisation is *already baked in*: the
Japanese screens are separate builds in the same pak, not a text swap.
## Facts the port will trip over