src/content/materials/powder.rs


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use crate::sim::cell_manager::sim::{PostUpdateAction, UpdateCtx};

#[inline]
pub fn sim_update(ctx: &mut UpdateCtx) -> PostUpdateAction {
    ctx.swap_or_settle(&[
        (0, 1),
        (-1 + 2 * ctx.seqno_parity as i32, 1),
        (1 - 2 * ctx.seqno_parity as i32, 1),
    ])
}