The CSequence frame-advance core (gaps G3/G4/G5/G6/G8/G9/G19),
ACE-verified skeleton + retail constants + the P0-pinned leftover carry:
- update_internal (0x005255d0): frame_number += framerate*dt; overshoot
clamps to the RAW high/low frame with leftover-time computation +
animDone; the pose/physics/hook triple fires for EVERY crossed integer
frame (ascending fwd / descending rev, strict > < boundaries, NO
epsilon, NO safety cap); AnimDone is a LIST-STRUCTURE gate (head !=
first_cyclic) queuing the global AnimDoneHook; iterative loop carries
the leftover into the next node (P0 pin — a lag spike fast-forwards
through multiple queued nodes in one tick).
- advance_to_next_animation (0x005252b0): four pose ops per transition
(subtract1 outgoing @ current frame + residual physics; step — fwd
wraps to first_cyclic, REVERSE wraps to the LIST TAIL, asymmetric by
design; reseed from the incoming direction-aware boundary; combine
incoming + physics). Pose ops run in BOTH directions — ACE's
framerate-sign gates are ACE-isms, decomp is unconditional modulo the
degenerate-framerate guard.
- update (0x00525b80): non-empty -> update_internal + apricot; empty +
frame -> accumulated-physics free motion (G8).
- execute_hooks (0x00524830): direction filter (Both or match) QUEUING
into the IAnimHookQueue host seam (stands in for CPhysicsObj.anim_hooks
+ the AnimDoneHook singleton; drain placement moves in R6). Null part
frame guarded (documented safe divergence vs retail's latent deref).
- FrameOps.Combine/Subtract1: the AFrame pose composition (verified
math from the pre-R1 port, now against DatReaderWriter Frame).
10 conformance tests: single-tick goldens, exact-integer boundary
sit (the old #61 flash class), cyclic wrap without AnimDone,
link->cycle fast-forward proving hook order (link hooks -> ANIMDONE ->
cycle hooks) AND the carry, reverse descending hooks with the OOB
high+1 start, reverse tail-wrap, zero-framerate physics-only,
empty-list free motion, pos-frame root motion into the caller Frame,
apricot trim via update. Full suite 3346 green.
R1 remaining: P5 (adapter cutover — AnimationSequencer rehosted on the
core, legacy epsilon/stale-head/safety-cap DELETED) + P6 (root-motion
wiring + API narrowing).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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