src/sim/materials/sand.rs


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use crate::sim::sim::UpdateCtx;

#[inline]
pub fn sim_update(ctx: &mut UpdateCtx) {
    ctx.candidates_swap(&[
        (ctx.self_x, ctx.self_y + 1),
        (ctx.self_x - 1 + 2 * ctx.seqno_parity as i32, ctx.self_y + 1),
        (ctx.self_x + 1 - 2 * ctx.seqno_parity as i32, ctx.self_y + 1),
    ]);
}