waiting for previous chunk loading before doing next

src/game/world/mod.rs

@@ -22,6 +22,7 @@ pub struct World {
     data: WorldData,
     loader: ChunkLoader,
     chunks: HashMap<Vector3<i32>, WorldChunk>,
+    busy: u32
 }
 
 impl World {
@@ -31,18 +32,24 @@ impl World {
             data: WorldData { name: name.clone(), ..Default::default() }, 
             loader: ChunkLoader::new(name.clone()),
             chunks: HashMap::new(),
+            busy: 0,
         };
         instance.load_metadata();
         instance.save_all();
         instance
     }
 
+    pub fn is_busy(&self) -> bool {
+        self.busy > 0
+    }
+
     /*
     *   Receives loaded chunks from ChunkLoader
     */
     pub fn update(&mut self) {
         for (pos, chunk) in self.loader.receive() {
             self.chunks.insert(pos, chunk);
+            self.busy -= 1;
         }
     }
 
@@ -51,6 +58,7 @@ impl World {
     */
     pub fn load_chunk(&mut self, pos: Vector3<i32>) {
         self.loader.load(pos);
+        self.busy += 1;
     }
 
     /*