From 6f67586b8fc6efdb86d0c9a9744c546da97c4dab Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Tue, 11 Aug 2026 00:46:56 -0700
Subject: physics for sand and water

---
 src/sim/materials.rs | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

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

diff --git a/src/sim/materials.rs b/src/sim/materials.rs
index 13a45f3..8b21618 100644
--- a/src/sim/materials.rs
+++ b/src/sim/materials.rs
@@ -4,19 +4,38 @@ pub struct Material<'a> {
     pub r: u8,
     pub g: u8,
     pub b: u8,
+
+    pub density: u8,
+}
+
+#[repr(u8)]
+#[derive(Clone, Copy, PartialEq, Eq)]
+pub enum MaterialId {
+    Void,
+    Sand,
+    Water,
 }
 
-pub static MATERIALS: [Material; 2] = [
+pub static MATERIALS: [Material; 3] = [
     Material {
         name: "Void",
         r: 0x00,
         g: 0x00,
         b: 0x00,
+        density: 0,
     },
     Material {
         name: "Sand",
-        r: 0xFF,
-        g: 0x00,
+        r: 0xDE,
+        g: 0xCB,
+        b: 0x85,
+        density: 50,
+    },
+    Material {
+        name: "Water",
+        r: 0x38,
+        g: 0xA9,
         b: 0xFF,
+        density: 40,
     },
 ];
-- 
cgit v1.3.1