Struct Executor 

pub struct Executor { /* private fields */ }

Deterministic single-threaded executor: one step is one frame. The root future and every spawned task are polled once per step, in a fixed order (root, then tasks in spawn order). No wakers, no clocks, no threads — the same input always produces the same frames.

Implementations

impl Executor

pub fn new( fps: f64, meta: Meta, seed: u64, root: impl Future<Output = ()> + 'static, ) -> Self

seed feeds the scene’s random generator (random).

pub fn enter<R>(&self, f: impl FnOnce() -> R) -> R

Runs f with this executor’s runtime installed, so that now(), tune! and friends work outside of step.

pub fn step(&mut self) -> bool

Computes the next frame. Returns true if the scene is finished (its root future completed during this or an earlier step).

pub fn is_finished(&self) -> bool

Whether the scene’s root task has completed.

pub fn frames_done(&self) -> u32

Number of frames computed so far; the last computed frame is frames_done() - 1.

pub fn fps(&self) -> f64

Frames per second.

pub fn meta(&self) -> Meta

Current markers, eases and tunables, including defaults recorded so far.

pub fn take_meta_changed(&self) -> bool

True if scene code recorded new defaults into the meta since the last call.