refactor sim loop

1 files changed, 10 insertions, 0 deletions

diff --git a/src/sim/materials/sand.rs b/src/sim/materials/sand.rs
new file mode 100644
index 0000000..6a780f3
--- /dev/null
+++ b/src/sim/materials/sand.rs
@@ -0,0 +1,10 @@
+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),
+    ]);
+}