From 05135beb87bbf0edace544b80ba40e327d9a89ac Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sat, 15 Aug 2026 20:44:10 -0700
Subject: factor code out of main, optimizations

---
 src/sim/world.rs | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

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

diff --git a/src/sim/world.rs b/src/sim/world.rs
index bdb1286..6645d4e 100644
--- a/src/sim/world.rs
+++ b/src/sim/world.rs
@@ -1,4 +1,4 @@
-use std::collections::HashMap;
+use fxhash::FxHashMap;
 
 use crate::{
     config::CHUNK_SIZE,
@@ -7,8 +7,8 @@ use crate::{
 
 pub struct World {
     pub chunks: Vec<Chunk>,
-    // TODO FxHashMap?
-    pub chunk_position_to_chunk_idx: HashMap<(i32, i32), usize>,
+    // TODO FxFxHashMap?
+    pub chunk_position_to_chunk_idx: FxHashMap<(i32, i32), usize>,
 }
 
 impl World {
@@ -60,7 +60,7 @@ impl World {
     pub fn from_default_size() -> Self {
         let mut world = World {
             chunks: Vec::new(),
-            chunk_position_to_chunk_idx: HashMap::new(),
+            chunk_position_to_chunk_idx: FxHashMap::default(),
         };
 
         for y in -10..10 {
-- 
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