From 1a515237afb7ad09353a65f5fbc6e98a7c29ce8e Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sat, 22 Aug 2026 15:00:35 -0700
Subject: sim manager refactor

---
 src/sim/cell_manager/chunk.rs | 47 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/sim/cell_manager/chunk.rs

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

diff --git a/src/sim/cell_manager/chunk.rs b/src/sim/cell_manager/chunk.rs
new file mode 100644
index 0000000..3fe5056
--- /dev/null
+++ b/src/sim/cell_manager/chunk.rs
@@ -0,0 +1,47 @@
+use crate::{
+    config::{CELLS_IN_CHUNK, CHUNK_SIZE},
+    sim::{
+        cell::{cell::Cell, materials::MaterialForm},
+        lib::marching_squares::Marchable,
+    },
+};
+
+pub struct Chunk {
+    pub cells: Box<[Cell; CELLS_IN_CHUNK]>,
+    pub sleeping: bool,
+    pub needs_texture_update: bool,
+}
+
+impl Chunk {
+    #[inline]
+    pub fn get_cell_at_local_position(&self, x: u8, y: u8) -> Cell {
+        self.cells[x as usize + y as usize * CHUNK_SIZE as usize]
+    }
+    #[inline]
+    pub fn set_cell_at_local_position(&mut self, x: u8, y: u8, cell: Cell) {
+        self.cells[x as usize + y as usize * CHUNK_SIZE as usize] = cell;
+    }
+
+    pub fn void() -> Self {
+        Chunk {
+            cells: Box::new([Cell::void(); CELLS_IN_CHUNK]),
+            sleeping: true,
+            needs_texture_update: true,
+        }
+    }
+}
+
+impl Marchable for Chunk {
+    fn occupied(&self, x: i32, y: i32) -> bool {
+        if x < 0 || x >= CHUNK_SIZE || y < 0 || y >= CHUNK_SIZE {
+            false
+        } else {
+            // we only build a path for solid cells or settled powder cells
+            let cell = self.get_cell_at_local_position(x as u8, y as u8);
+            cell.material.def().form == MaterialForm::Solid || cell.settled() > 4
+        }
+    }
+    fn size(&self) -> (i32, i32) {
+        (CHUNK_SIZE, CHUNK_SIZE)
+    }
+}
-- 
cgit v1.3.1