From 4d4f28f4d0e93541e92277f44451aacdc23b8227 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Tue, 18 Aug 2026 00:21:44 -0700
Subject: MVP of marching squares

---
 src/sim/cell_sim/chunk.rs   | 15 +++++++++++++-
 src/sim/cell_sim/mod.rs     |  1 -
 src/sim/cell_sim/overlay.rs | 50 ---------------------------------------------
 3 files changed, 14 insertions(+), 52 deletions(-)
 delete mode 100644 src/sim/cell_sim/overlay.rs

(limited to 'src/sim/cell_sim')

diff --git a/src/sim/cell_sim/chunk.rs b/src/sim/cell_sim/chunk.rs
index 116a38a..8c3acb4 100644
--- a/src/sim/cell_sim/chunk.rs
+++ b/src/sim/cell_sim/chunk.rs
@@ -1,6 +1,9 @@
 use crate::{
     config::{CELLS_IN_CHUNK, CHUNK_SIZE},
-    sim::cell::cell::Cell,
+    sim::{
+        cell::{cell::Cell, materials::MaterialId},
+        lib::marching_squares::Marchable,
+    },
 };
 
 pub struct Chunk {
@@ -27,3 +30,13 @@ impl Chunk {
         }
     }
 }
+
+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 {
+            self.get_cell_at_local_position(x as u8, y as u8).material != MaterialId::Void
+        }
+    }
+}
diff --git a/src/sim/cell_sim/mod.rs b/src/sim/cell_sim/mod.rs
index a1db2a1..b7d0597 100644
--- a/src/sim/cell_sim/mod.rs
+++ b/src/sim/cell_sim/mod.rs
@@ -1,4 +1,3 @@
 pub mod chunk;
-pub mod overlay;
 pub mod sim;
 pub mod world;
diff --git a/src/sim/cell_sim/overlay.rs b/src/sim/cell_sim/overlay.rs
deleted file mode 100644
index ee494ae..0000000
--- a/src/sim/cell_sim/overlay.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-use crate::{Config, Input, sim::cell_sim::world::World};
-
-pub fn create_compute_combined_overlay_offset(
-    world: &World,
-    config: &Config,
-    input: &Input,
-) -> impl Fn(i32, i32) -> (u8, u8, u8, u8) {
-    puffin::profile_function!();
-    // TODO fix this move?
-    move |pixel_x: i32, pixel_y: i32| {
-        // could allow negative offsets too
-        let mut offset: (u8, u8, u8, u8) = (0x00, 0x00, 0x00, 0x00);
-
-        // // bounds
-        // // left
-        // let xl = -((board.get_game_width() / 2 + 1) as i32);
-        // // right
-        // let xu = (board.get_game_width() / 2 + 1) as i32;
-        // // bottom
-        // let yl = -((board.get_game_height() / 2 + 1) as i32);
-        // // top
-        // let yu = (board.get_game_height() / 2 + 1) as i32;
-
-        // if ((pixel_x == xl || pixel_x == xu) && (pixel_y <= yu && pixel_y >= yl))
-        //     || (pixel_y == yl || pixel_y == yu) && (pixel_x <= xu && pixel_x >= xl)
-        // {
-        //     offset.0 = offset.0.saturating_add(0xFF);
-        //     offset.1 = offset.1.saturating_add(0xFF);
-        //     offset.2 = offset.2.saturating_add(0xFF);
-        // }
-
-        // // grid
-        // if pixel_x % 30 == 0 || pixel_y % 30 == 0 {
-        //     offset.0 = offset.0.saturating_add(0x10);
-        //     offset.1 = offset.1.saturating_add(0x10);
-        //     offset.2 = offset.2.saturating_add(0x10);
-        // }
-
-        // // brush/selection
-        // if input.last_mouse_pos_on_board.is_some_and(|p| {
-        //     ((pixel_x - p.0).pow(2) + (pixel_y - p.1).pow(2)) < (config.brush_radius as i32).pow(2)
-        // }) {
-        //     offset.0 = offset.0.saturating_add(0x82);
-        //     offset.1 = offset.1.saturating_add(0xA1);
-        //     offset.2 = offset.2.saturating_add(0xAD);
-        // }
-
-        return offset;
-    }
-}
-- 
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