resource: make BlockTypeMap return BlockType without reference

src/resource/mod.rs

@@ -53,11 +53,20 @@ impl BlockType {
 	}
 }
 
-pub type BlockTypeMap = HashMap<String, BlockType>;
+pub struct BlockTypeMap(HashMap<String, BlockType>);
+
+impl BlockTypeMap {
+	#[inline]
+	pub fn get(&self, id: &str) -> Option<BlockType> {
+		self.0.get(id).copied()
+	}
+}
 
 pub fn block_types() -> BlockTypeMap {
+	BlockTypeMap(
 		block_types::BLOCK_TYPES
 			.iter()
 			.map(|(k, v)| (String::from(*k), *v))
-		.collect()
+			.collect(),
+	)
 }

src/world/layer.rs

@@ -110,7 +110,7 @@ pub fn top_layer(chunk: &Chunk, block_types: &BlockTypeMap) -> Result<Box<BlockI
 
 		let coords = SectionBlockCoords { xz, y };
 		let block_id = section.block_id_at(coords)?;
-		let Some(&block_type) = block_types.get(block_id) else {
+		let Some(block_type) = block_types.get(block_id) else {
 			eprintln!("Unknown block type: {}", block_id);
 			continue;
 		};