Function ease_sample

perro_source/core/perro_animation/src/panim/tracks.rs:1292–1306

(ease: AnimationEase, t: f32)

        if *f <= frame {
            prev = Some((*f, key, comp));
        } else {
            next = Some((*f, key, comp));
            break;
        }
    }
    resolve_sample(frame, prev, next, lerp)
}

fn resolve_sample<T: Copy>(
    frame: u32,
    prev: Option<(u32, &TrackKey, T)>,
    next: Option<(u32, &TrackKey, T)>,
    lerp: impl Fn(T, T, f32) -> T,
) -> Option<T> {
    match (prev, next) {
        (None, None) => None,
        (Some((_, _, value)), None) => Some(value),
        (None, Some((_, _, value))) => Some(value),