From 7ce9781f86c56f932dabc3bc84b8d21d7be8fecc Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Tue, 11 Aug 2026 20:41:41 -0700
Subject: refactor sim loop

---
 src/sim/materials/sand.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 src/sim/materials/sand.rs

(limited to 'src/sim/materials/sand.rs')

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),
+    ]);
+}
-- 
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