improve docs for biome code

azalea-registry/src/data.rs

@@ -24,7 +24,8 @@ impl<T: DataRegistry> Registry for T {
 }
 
 macro_rules! data_registry {
-    ($name:ident, $registry_name:expr) => {
+    ($(#[$doc:meta])* $name:ident, $registry_name:expr) => {
+        $(#[$doc])*
         #[derive(Debug, Clone, Copy, AzBuf, PartialEq, Eq, Hash)]
         pub struct $name {
             #[var]
@@ -54,7 +55,15 @@ data_registry! {PigVariant, "pig_variant"}
 data_registry! {PaintingVariant, "painting_variant"}
 data_registry! {WolfVariant, "wolf_variant"}
 
-data_registry! {Biome, "biome"}
+data_registry! {
+    /// An opaque biome identifier.
+    ///
+    /// You'll probably want to resolve this into its name before using it, by
+    /// using `Client::with_resolved_registry` or a similar function.
+    Biome,
+    "worldgen/biome"
+}
+
 // these extra traits are required for Biome to be allowed to be palletable
 impl Default for Biome {
     fn default() -> Self {

azalea-world/src/world.rs

@@ -179,6 +179,14 @@ impl Instance {
         self.chunks.get_block_state(pos).map(FluidState::from)
     }
 
+    /// Get the biome at the given position.
+    ///
+    /// You can then use `Client::with_resolved_registry` to get the name and
+    /// data from the biome.
+    ///
+    /// Note that biomes are internally stored as 4x4x4 blocks, so if you're
+    /// writing code that searches for a specific biome it'll probably be more
+    /// efficient to avoid scanning every single block.
     pub fn get_biome(&self, pos: &BlockPos) -> Option<Biome> {
         self.chunks.get_biome(pos)
     }