From 2640f91e36558650bb988dcc82b5148ee71f3eb0 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Tue, 18 Aug 2026 22:22:27 -0700
Subject: optimize with settlement counter

---
 src/sim/cell/materials/mod.rs | 42 ++++++++++++++++++++++++++----------------
 1 file changed, 26 insertions(+), 16 deletions(-)

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

diff --git a/src/sim/cell/materials/mod.rs b/src/sim/cell/materials/mod.rs
index 0d19696..9bcf5e4 100644
--- a/src/sim/cell/materials/mod.rs
+++ b/src/sim/cell/materials/mod.rs
@@ -2,9 +2,8 @@ use crate::sim::cell_sim::sim::UpdateCtx;
 
 mod fire;
 mod gas;
-mod sand;
-mod smoke;
-mod water;
+mod liquid;
+mod powder;
 
 #[repr(u8)]
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
@@ -13,71 +12,82 @@ pub enum MaterialId {
     Sand,
     Wood,
     Water,
-    Gas,
     Fire,
     Smoke,
 }
 
+#[repr(u8)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum MaterialForm {
+    Void,
+    Gas,
+    Liquid,
+    Powder,
+    Solid,
+}
+
 pub struct MaterialDef {
     pub name: &'static str,
     pub color: (u8, u8, u8, u8),
     pub density: u8,
+    pub form: MaterialForm,
     pub sim_update: Option<fn(ctx: &mut UpdateCtx) -> ()>,
 }
 
-static MATERIALS: [MaterialDef; 7] = [
+static MATERIALS: [MaterialDef; 6] = [
     MaterialDef {
         name: "Void",
         color: (0x00, 0x00, 0x00, 0x00),
         density: 0,
+        // form usually but not always determines the update fn
+        form: MaterialForm::Void,
         sim_update: None,
     },
     MaterialDef {
         name: "Sand",
         color: (0xDE, 0xCB, 0x85, 0xFF),
         density: 50,
-        sim_update: Some(sand::sim_update),
+        form: MaterialForm::Powder,
+        sim_update: Some(powder::sim_update),
     },
     MaterialDef {
         name: "Wood",
         color: (0x85, 0x56, 0x1D, 0xFF),
         density: 50,
+        form: MaterialForm::Solid,
         sim_update: None,
     },
     MaterialDef {
         name: "Water",
         color: (0x38, 0xA9, 0xFF, 0xFF),
         density: 40,
-        sim_update: Some(water::sim_update),
-    },
-    MaterialDef {
-        name: "Gas",
-        color: (0xBD, 0xFF, 0xE4, 0xAA),
-        density: 10,
-        sim_update: Some(gas::sim_update),
+        form: MaterialForm::Liquid,
+        sim_update: Some(liquid::sim_update),
     },
+    // TODO this is not a material
     MaterialDef {
         name: "Fire",
         color: (0xFC, 0x66, 0x00, 0xAA),
         // for now this matches wood
         density: 50,
+        form: MaterialForm::Gas,
         sim_update: Some(fire::sim_update),
     },
     MaterialDef {
         name: "Smoke",
         color: (0x32, 0x35, 0x36, 0xAA),
         density: 15,
-        sim_update: Some(smoke::sim_update),
+        form: MaterialForm::Gas,
+        sim_update: Some(gas::sim_update),
     },
 ];
 
 impl MaterialId {
-    pub const ALL: [MaterialId; 7] = [
+    pub const ALL: [MaterialId; 6] = [
         MaterialId::Void,
         MaterialId::Sand,
         MaterialId::Wood,
         MaterialId::Water,
-        MaterialId::Gas,
         MaterialId::Fire,
         MaterialId::Smoke,
     ];
-- 
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