From e6742f59102f2beb305b813d7f0ee1d544bbc3e0 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 23 Aug 2026 12:14:19 -0700
Subject: separate data from cells

---
 src/sim/cell_manager/chunk.rs | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/sim/cell_manager/chunk.rs')

diff --git a/src/sim/cell_manager/chunk.rs b/src/sim/cell_manager/chunk.rs
index 463242d..3bf1e9f 100644
--- a/src/sim/cell_manager/chunk.rs
+++ b/src/sim/cell_manager/chunk.rs
@@ -1,13 +1,16 @@
+use fxhash::FxHashMap;
 use glam::IVec2;
 
 use crate::{
     config::{CELLS_IN_CHUNK, CHUNK_SIZE},
     content::materials::MaterialForm,
-    sim::{cell::Cell, lib::marching_squares::Marchable},
+    sim::{cell::Cell, entity::EntityId, lib::marching_squares::Marchable},
 };
 
 pub struct Chunk {
     pub cells: Box<[Cell; CELLS_IN_CHUNK]>,
+    pub cell_data: FxHashMap<usize, u16>,
+    pub cell_entity: FxHashMap<usize, EntityId>,
     pub sleeping: bool,
     pub needs_texture_update: bool,
 }
@@ -22,9 +25,35 @@ impl Chunk {
         self.cells[x as usize + y as usize * CHUNK_SIZE as usize] = cell;
     }
 
+    #[inline]
+    pub fn get_data_at_local_position(&self, x: u8, y: u8) -> Option<u16> {
+        self.cell_data
+            .get(&(x as usize + y as usize * CHUNK_SIZE as usize))
+            .copied()
+    }
+    #[inline]
+    pub fn set_data_at_local_position(&mut self, x: u8, y: u8, data: u16) {
+        self.cell_data
+            .insert(x as usize + y as usize * CHUNK_SIZE as usize, data);
+    }
+
+    #[inline]
+    pub fn get_entity_at_local_position(&self, x: u8, y: u8) -> Option<EntityId> {
+        self.cell_entity
+            .get(&(x as usize + y as usize * CHUNK_SIZE as usize))
+            .copied()
+    }
+    #[inline]
+    pub fn set_entity_at_local_position(&mut self, x: u8, y: u8, entity_id: EntityId) {
+        self.cell_entity
+            .insert(x as usize + y as usize * CHUNK_SIZE as usize, entity_id);
+    }
+
     pub fn void() -> Self {
         Chunk {
             cells: Box::new([Cell::void(); CELLS_IN_CHUNK]),
+            cell_data: FxHashMap::default(),
+            cell_entity: FxHashMap::default(),
             sleeping: true,
             needs_texture_update: true,
         }
-- 
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