Write layers (#44)

src/dot_vox_data.rs

@@ -29,6 +29,7 @@ impl DotVoxData {
         self.write_scene_graph(&mut children_buffer)?;
         self.write_palette_chunk(&mut children_buffer)?;
         self.write_materials(&mut children_buffer)?;
+        self.write_layers(&mut children_buffer)?;
         let num_main_children_bytes = children_buffer.len() as u32;
 
         self.write_main_chunk(writer, num_main_children_bytes)?;
@@ -169,6 +170,18 @@ impl DotVoxData {
         Ok(())
     }
 
+    fn write_layers<W: Write>(&self, writer: &mut W) -> Result<(), io::Error> {
+        for (i, layer) in self.layers.iter().enumerate() {
+            let id = i as u32;
+            let mut chunk = Vec::new();
+            chunk.extend_from_slice(&id.to_le_bytes());
+            Self::write_dict(&mut chunk, &layer.attributes);
+            chunk.extend_from_slice(&u32::MAX.to_le_bytes());
+            Self::write_leaf_chunk(writer, "LAYR", &chunk)?;
+        }
+        Ok(())
+    }
+
     fn write_leaf_chunk<W: Write>(writer: &mut W, id: &str, chunk: &[u8]) -> Result<(), io::Error> {
         let num_children_bytes: u32 = 0;
 

src/lib.rs

@@ -443,8 +443,8 @@ mod tests {
         write_and_load(placeholder(
             DEFAULT_PALETTE.to_vec(),
             DEFAULT_MATERIALS.to_vec(),
-            Vec::new(),
-            Vec::new(),
+            placeholder::SCENES.to_vec(),
+            placeholder::LAYERS.to_vec(),
         ));
     }
 }