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port: F6 -- adopt the measured leaf clock, and stop a parent killing its leaf

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Two changes, both measured, neither invented.

1. LEAF CLOCK. authored/rendering.json leaf_clock.title = {start_units 40,
   rate 0.514}, from the Decoder's f6-unit8, both numbers off ONE capture. The
   title's own rate is measured rather than assumed there (ptcopyright ramps
   0->255 over 22 declared units across 22 frames = 1.000 units/frame), which was
   the assumption their unit 4 had flagged. Supersedes their earlier 0.463, which
   divided by the end of MOTION -- the declared track is stationary from t=540 to
   600, so that denominator was short; 0.514 anchors on the loop wrap.

   Corroborated independently: the human reported the port looks FASTER than the
   game, offered as an impression. 1.0x against 0.514x is exactly twice too fast.

2. A LEAF OUTLIVES ITS PARENT. _draw skipped any element whose PARENT posed
   transparent, before _draw_leaf was reached, so ptloop01 expiring at t=250 took
   the sweep with it -- while this file's own decode says the leaf runs on its own
   timeline and the parent's alpha is not multiplied in. The two were inconsistent
   and the silent gate won. The capture settles it: the game submits the sweep
   across frames 746..1913 while the parent expires at 956, so it keeps drawing
   ~950 frames after the parent is gone.

VERIFIED by probing the running renderer at two PRE-REGISTERED instants:
  title u=400 -> leaf t=185.0, pteff03 centre 301 (predicted 301),
                                pteff03a centre 1169 (predicted 1168)
  title u=800 -> leaf t=390.6, pteff03 centre 1124 (predicted 1124),
                                pteff03a centre 333 (predicted 332)
All within 1 px.

Effect at the plate's arrival (title t=236): the sweep's centre moves from 505 --
halfway across the screen -- to -36, just entering at the left edge. The human's
report is that the game's glow begins when the plate appears.
This commit is contained in:
Sylpheed port agent
2026-09-02 19:18:34 +00:00
parent 4d533185e7
commit d7e4a7167e
2 changed files with 38 additions and 19 deletions
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43
authored/rendering.json
View File

@@ -171,30 +171,37 @@
],
"leaf_clock": {
"title": {
"start_units": null,
"rate": null
"start_units": 40.0,
"rate": 0.514
}
},
"leaf_clock_why": [
"The leaf's clock relative to its screen's, as an origin and a rate.",
"The leaf's clock relative to its screen's: leaf_t = rate * (screen_t - start_units).",
"",
"\ud83d\udd34 BOTH null ON PURPOSE. null means the leaf runs on the screen clock --",
"which is what the port has always done, and which is ITSELF an unmeasured",
"assumption (offset 0, rate 1) that the Decoder's capture contradicts.",
"MEASURED off one draw capture by the Decoder, docs/re/f6-unit8-leaf-clock-in-title-units.md",
"on origin/auto/frame-blend-draw-path. Both numbers come from the SAME capture,",
"so neither crosses runs.",
"",
"F6: a human reports the title's light sweep starts earlier in the port than",
"in the game, and separately that the port may be running it FASTER --",
"flagged by them as an impression, not a judgement to lean on. The capture",
"points the same way from a different direction: the game's leaf t=0 is its",
"first drawn frame, 40 frames after the title's first element, and its rate",
"measures well below the title's.",
" start_units 40 -- the game's leaf t=0 is its first drawn frame, 40 frames",
" after the title's first element draws. The title rate is",
" itself measured, not assumed: ptcopyright declares a",
" 0->255 ramp over 22 units and rises across 22 frames, so",
" the title runs 1.000 units/frame and frames and units are",
" interchangeable there.",
" rate 0.514 -- 600 leaf units across 1168 frames, anchored on the LOOP",
" WRAP rather than on where motion stops. Within 3% of 1/2.",
"",
"\u26a0\ufe0f NOT FILLED IN WITH AN ESTIMATE. F1 established the rule the hard way: an",
"invented constant here is indistinguishable from a measured one later. The",
"figures come from the Decoder expressed in TITLE units, with the title's own",
"rate stated rather than assumed -- their unit 4 flags that rate as an",
"assumption, and it is load-bearing for both numbers.",
"This SUPERSEDES their earlier 0.463, which divided by the end of MOTION; the",
"declared track is stationary from t=540 to t=600, so that denominator was short.",
"",
"To adopt: set start_units and rate. Nothing else changes."
"CORROBORATION from a second, independent direction: the human, watching both,",
"reported the port looks FASTER than the game -- offered as an impression, not a",
"judgement to lean on. A 1.0x port against a 0.514x game is exactly twice too",
"fast, which is the direction and roughly the size they describe.",
"",
"RESIDUAL RISK, stated: the rate rests on a SINGLE wrap in a single capture.",
"A wrap-to-wrap period would harden it. Adopted anyway because the port's",
"current value is not a measurement at all -- it is the unexamined assumption",
"that the leaf shares the screen's clock, which this refutes."
]
}

14
port/scripts/screen_view.gd
View File

@@ -897,7 +897,19 @@ func _draw() -> void:
var pose: Dictionary = element.get("rest", {}) if pose_mode == Pose.REST \
else pose_at(element, time_units)
var colour := modulate_of(pose)
if colour.a <= 0.0:
# 🔴 A LEAF OUTLIVES ITS PARENT, AND SKIPPING HERE KILLED IT EARLY.
#
# The parent's pose gates the whole element, so `ptloop01` expiring at
# t=250 stopped the sweep being drawn at all -- while this file's own
# decode says the leaf runs on its OWN timeline and the parent's alpha is
# not multiplied in. The two were inconsistent and the gate won silently.
#
# The capture settles it: the game submits the sweep across frames
# 746..1913 while the parent expires at frame 956, so it keeps drawing for
# roughly 950 frames after the parent is gone
# (`f6-unit3-sweep-track-fits.md`, `f6-unit8-leaf-clock-in-title-units.md`).
# A transparent parent is not evidence that its leaf is transparent.
if colour.a <= 0.0 and not draw_leaf_for.has(id):
# 🔴 THIS LINE USED TO SAY "at rest" WHATEVER INSTANT IT HAD POSED.
#
# On the timeline path the pose is `pose_at(time_units)`, not