From f177cc716c5f2aa5b50b14ccbb421de89e3a7854 Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sun, 16 Aug 2026 17:29:42 -0700
Subject: wip

---
 src/sim/cell_sim/world.rs | 69 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/sim/cell_sim/world.rs

(limited to 'src/sim/cell_sim/world.rs')

diff --git a/src/sim/cell_sim/world.rs b/src/sim/cell_sim/world.rs
new file mode 100644
index 0000000..924639a
--- /dev/null
+++ b/src/sim/cell_sim/world.rs
@@ -0,0 +1,69 @@
+use fxhash::FxHashMap;
+
+use crate::{
+    config::CHUNK_SIZE,
+    sim::{cell::cell::Cell, cell_sim::chunk::Chunk},
+};
+
+pub struct World {
+    pub chunks: Vec<Chunk>,
+    // TODO FxFxHashMap?
+    pub chunk_position_to_chunk_idx: FxHashMap<(i32, i32), usize>,
+}
+
+impl World {
+    #[inline]
+    pub fn split_game_position(x: i32, y: i32) -> ((i32, i32), (u8, u8)) {
+        (
+            (
+                // TODO is this cast expensive?
+                x.div_euclid(CHUNK_SIZE),
+                y.div_euclid(CHUNK_SIZE),
+            ),
+            (
+                x.rem_euclid(CHUNK_SIZE) as u8,
+                y.rem_euclid(CHUNK_SIZE) as u8,
+            ),
+        )
+    }
+
+    // VERY EXPENSIVE
+    pub fn get_cell_from_game_position(&self, x: i32, y: i32) -> Option<Cell> {
+        let ((cx, cy), (dx, dy)) = World::split_game_position(x, y);
+        self.chunk_position_to_chunk_idx
+            .get(&(cx, cy))
+            .map(|&idx| self.chunks[idx].get_cell_at_local_position(dx, dy))
+    }
+
+    // VERY EXPENSIVE
+    pub fn set_cell_from_game_position(&mut self, x: i32, y: i32, cell: Cell, sleeping: bool) {
+        let ((cx, cy), (dx, dy)) = World::split_game_position(x, y);
+        if let Some(&idx) = self.chunk_position_to_chunk_idx.get(&(cx, cy)) {
+            self.chunks[idx].set_cell_at_local_position(dx, dy, cell);
+            // this is a temporary hack
+            self.chunks[idx].sleeping = sleeping;
+            self.chunks[idx].needs_texture_update = true;
+        }
+    }
+
+    pub fn insert(&mut self, x: i32, y: i32, chunk: Chunk) {
+        self.chunk_position_to_chunk_idx
+            .insert((x, y), self.chunks.len());
+        self.chunks.push(chunk);
+    }
+
+    pub fn from_default_size() -> Self {
+        let mut world = World {
+            chunks: Vec::new(),
+            chunk_position_to_chunk_idx: FxHashMap::default(),
+        };
+
+        for y in -10..1 {
+            for x in -100..100 {
+                world.insert(x, y, Chunk::void());
+            }
+        }
+
+        world
+    }
+}
-- 
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