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/mod.rs | 60 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 src/sim/materials/mod.rs

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

diff --git a/src/sim/materials/mod.rs b/src/sim/materials/mod.rs
new file mode 100644
index 0000000..410236d
--- /dev/null
+++ b/src/sim/materials/mod.rs
@@ -0,0 +1,60 @@
+use crate::sim::sim::UpdateCtx;
+
+mod sand;
+mod water;
+
+#[repr(u8)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum MaterialId {
+    Void = 0,
+    Sand,
+    Wood,
+    Water,
+}
+
+pub struct MaterialDef {
+    pub name: &'static str,
+    pub color: [u8; 4],
+    pub density: u8,
+    pub sim_update: Option<fn(ctx: &mut UpdateCtx) -> ()>,
+}
+
+static MATERIALS: [MaterialDef; 4] = [
+    MaterialDef {
+        name: "Void",
+        color: [0x00, 0x00, 0x00, 0xFF],
+        density: 0,
+        sim_update: None,
+    },
+    MaterialDef {
+        name: "Sand",
+        color: [0xDE, 0xCB, 0x85, 0xFF],
+        density: 50,
+        sim_update: Some(sand::sim_update),
+    },
+    MaterialDef {
+        name: "Wood",
+        color: [0x85, 0x56, 0x1D, 0xFF],
+        density: 50,
+        sim_update: None,
+    },
+    MaterialDef {
+        name: "Water",
+        color: [0x38, 0xA9, 0xFF, 0xFF],
+        density: 40,
+        sim_update: Some(water::sim_update),
+    },
+];
+
+impl MaterialId {
+    pub const ALL: [MaterialId; 4] = [
+        MaterialId::Void,
+        MaterialId::Sand,
+        MaterialId::Wood,
+        MaterialId::Water,
+    ];
+    #[inline]
+    pub fn def(self) -> &'static MaterialDef {
+        &MATERIALS[self as usize]
+    }
+}
-- 
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