Entry 138

Running bobs with its root keys

2026-10-163mplay

Filescrates/rugrats/src/actors/player.rscrates/rugrats/tests/play.rs

The run plays table states 3 and 4 in turn (0x80056484), each with its own root keys. The oracle's body, run from the hub's start with the stick held, bobs:

746, 739, 756, 761, 769, 780, 751, 731, 720, 753, 773, 778, ...

and comes back to the floor (779-780) each round.

With worklog 137's root_y the port drifted up by 11 a round. Each time the state changed, the last frame of the animation before was dropped. Player::root_step now:

• keeps the base track as it last saw it (RootSeen: state, frames, frame, root y so far and whole);
• adds the rest of an animation that reached its last frame when the next begins, or when a loop starts round again.

The jump's crouch is the exception. Its last part is not taken, as the body leaves the floor when state 6 comes; the oracle goes 868, 868, then 814.

Port against oracle, over three rounds: 747/746, 739/739, 756/756, 761/761, 769/769, 779/780, 750/751, 730/731, 720/720, 753/753, 773/773, 778/778, ...

Test: running_bobs_as_the_original holds 18 frames within 2. The jump's test (worklog 137) still holds.