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re: not ONE of the 80 forced instances has a file-read key

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The port agent pointed out that forced_backdrop_necessity.rs collapsed
sprite_layer_key (a u16 read from the T8aD header, decoded) with
implied_layer_key (this crate's table of positions MEASURED in the running
game), and that 'has its own key' therefore reads as file-backed when it is
not. Splitting them is stronger than either of us stated:

    read from the T8aD header:   0
    implied (measured):         14   10x pfbase.tbm, 4x palogo_eff0.prm
    nothing at all:             66   62 decided, 4 inert

Zero. There is no instance on the disc where a forced element also carries a
file-read layer key, so this rule has never been checked against a decoded
field -- there is no case where both can speak. That is what a keyless-element
fallback necessarily looks like, but it removes a check a reader would assume
exists.

Also corrects something I said to the port and had wrong. 'None of the 18 is
evidence for the rule in any direction' conflated two questions. Whether the
rule changes the composite: no, the sort already had the key. Whether the rule
gets the RIGHT answer: yes, and the 14 implied keys are measured positions, so
this is the rule agreeing with the oracle -- its only external corroboration,
and there are 14 instances of it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
This commit is contained in:
sylph-decoder
2026-08-30 07:11:12 +00:00
parent 215943e873
commit b8cb695053
3 changed files with 209 additions and 6 deletions
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100
docs/re/data/forced-backdrop-key-source.txt Normal file
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# What kind of key does each of the 80 forced instances have?
#
# Produced by: cargo run -p sylpheed-formats --example forced_backdrop_key_source
# 2026-08-30, SYLPHEED_DISC=/disc, every dat/*.pak.
#
# forced_backdrop_necessity.rs collapsed sprite_layer_key (a u16 READ from the
# T8aD header -- decoded) with implied_layer_key (this crate's per-name table of
# positions MEASURED in the running game). Raised by the port agent; splitting
# them gives a stronger result than either of us stated.
#
# read from the T8aD header: 0 <-- NOT ONE, anywhere on the disc
# implied (measured): 14 10x pfbase.tbm, 4x palogo_eff0.prm
# nothing at all: 66 62 the rule decides, 4 inert
#
# archive entry element key_source key
GP_BUNK.pak 0 px_bunk_base.tbm none -
GP_BUNK.pak 2 px_bunk_base.tbm none -
GP_BUNK.pak 4 pvbase.tbm none -
GP_BUNK.pak 6 pvbase.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 118 px_deb_base.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 130 px_deb_base.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 131 pjbgbase2.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 134 px_deb_base.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 150 pjbgbase2.tbm none -
GP_DEBRIEFING_PILOTLOG.pak 165 px_deb_base.tbm none -
GP_DIALOG.pak 2 pcbase.tbm none -
GP_DIALOG.pak 3 pcbase.tbm none -
GP_DIALOG.pak 9 pzeff00.prm none -
GP_DIALOG.pak 10 pzeff00.prm none -
GP_DIALOG.pak 11 pzeff00.prm none -
GP_DIALOG.pak 12 pzeff00.prm none -
GP_DIALOG.pak 13 pzeff00.prm none -
GP_DIALOG.pak 14 pzeff00.prm none -
GP_DIALOG.pak 15 pzeff00.prm none -
GP_DIALOG.pak 16 pzeff00.prm none -
GP_DIALOG.pak 17 pzeff00.prm none -
GP_DIALOG.pak 18 pzeff00.prm none -
GP_DIALOG.pak 19 pzeff00.prm none -
GP_DIALOG.pak 20 pzeff00.prm none -
GP_DIALOG.pak 21 pzeff00.prm none -
GP_DIALOG.pak 22 pzeff00.prm none -
GP_DIALOG.pak 23 pzeff00.prm none -
GP_DIALOG.pak 24 pzeff00.prm none -
GP_DIALOG.pak 25 pzeff00.prm none -
GP_DIALOG.pak 26 pzeff00.prm none -
GP_DIALOG.pak 28 pzeff00.prm none -
GP_DIALOG.pak 29 pzeff00.prm none -
GP_DIALOG.pak 30 pzeff00.prm none -
GP_DIALOG.pak 31 pzeff00.prm none -
GP_DIALOG.pak 32 pzeff00.prm none -
GP_DIALOG.pak 33 pzeff00.prm none -
GP_DIALOG.pak 34 pzeff00.prm none -
GP_DIALOG.pak 35 pzeff00.prm none -
GP_DIALOG.pak 36 pzeff00.prm none -
GP_DIALOG.pak 37 pzeff00.prm none -
GP_DIALOG.pak 38 pzeff00.prm none -
GP_DIALOG.pak 39 pzeff00.prm none -
GP_DIALOG.pak 40 pzeff00.prm none -
GP_DIALOG.pak 41 pzeff00.prm none -
GP_DIALOG.pak 86 esrb_base.prm none -
GP_DIALOG.pak 130 esrb_base.prm none -
GP_GAMEOVER.pak 4 pnbase.tbm none -
GP_GAMEOVER.pak 7 pnbase.tbm none -
GP_MISSION_SELECT.pak 3 px_mission_base.tbm none -
GP_MISSION_SELECT.pak 5 px_mission_base.tbm none -
GP_MOVIE_THEATER.pak 0 px_movie_base.tbm none -
GP_MOVIE_THEATER.pak 1 px_movie_base.tbm none -
GP_OPTIONS.pak 0 po_menu_base.tbm none -
GP_OPTIONS.pak 0 po_menu_base.tbm none -
GP_OPTIONS.pak 2 po_menu_base.tbm none -
GP_OPTIONS.pak 2 po_menu_base.tbm none -
GP_SAVE_LOAD.pak 37 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 37 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 40 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 40 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 46 pgloading_eff00.prm none -
GP_SAVE_LOAD.pak 58 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 69 pgloading_eff00.prm none -
GP_SAVE_LOAD.pak 78 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 89 px_replay_base.tbm none -
GP_SAVE_LOAD.pak 93 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 93 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 98 px_replay_base.tbm none -
GP_SAVE_LOAD.pak 99 pfbase.tbm implied_MEASURED 0x00000000
GP_SAVE_LOAD.pak 99 pfbase.tbm implied_MEASURED 0x00000000
GP_SYSTEM.pak 0 pqbase.tbm none -
GP_SYSTEM.pak 1 pqbase.tbm none -
GP_TITLE.pak 10 palogo_eff0.prm implied_MEASURED 0x00000000
GP_TITLE.pak 11 palogo_eff0.prm implied_MEASURED 0x00000000
GP_TITLE.pak 12 pgloading_eff00.prm none -
GP_TITLE.pak 13 palogo_eff0.prm implied_MEASURED 0x00000000
GP_TITLE.pak 14 palogo_eff0.prm implied_MEASURED 0x00000000
GP_TITLE.pak 15 pgloading_eff00.prm none -
GP_TUTORIAL.pak 0 pubase.tbm none -
GP_TUTORIAL.pak 1 pubase.tbm none -
# forced instances by key source:
# read from the T8aD header (decoded): 0
# implied — this crate's MEASURED name table: 14
# none — only forced_backdrop can speak: 66