From d028d7c3e9c84d177b7b10fa0d8f77d11bcea20f Mon Sep 17 00:00:00 2001
From: mat <git@matdoes.dev>
Date: Mon, 2 Jun 2025 07:45:26 +1100
Subject: add basic support for getting biome ids in chunks

---
 azalea-core/src/position.rs | 48 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 46 insertions(+), 2 deletions(-)

(limited to 'azalea-core/src')

diff --git a/azalea-core/src/position.rs b/azalea-core/src/position.rs
index 04cce036..5932cb5b 100644
--- a/azalea-core/src/position.rs
+++ b/azalea-core/src/position.rs
@@ -539,8 +539,8 @@ impl From<ChunkBlockPos> for u64 {
 }
 impl nohash_hasher::IsEnabled for ChunkBlockPos {}
 
-/// The coordinates of a block inside a chunk section. Each coordinate must be
-/// in the range [0, 15].
+/// The coordinates of a block inside a chunk section. Each coordinate should be
+/// in the range 0..=15.
 #[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
 pub struct ChunkSectionBlockPos {
     pub x: u8,
@@ -549,6 +549,50 @@ pub struct ChunkSectionBlockPos {
 }
 vec3_impl!(ChunkSectionBlockPos, u8);
 
+/// The coordinates of a chunk inside a chunk section. Each coordinate should be
+/// in the range 0..=3.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub struct ChunkSectionBiomePos {
+    pub x: u8,
+    pub y: u8,
+    pub z: u8,
+}
+impl From<&ChunkBiomePos> for ChunkSectionBiomePos {
+    #[inline]
+    fn from(pos: &ChunkBiomePos) -> Self {
+        ChunkSectionBiomePos {
+            x: pos.x,
+            y: (pos.y & 0b11) as u8,
+            z: pos.z,
+        }
+    }
+}
+vec3_impl!(ChunkSectionBiomePos, u8);
+
+/// The coordinates of a biome inside a chunk. Biomes are 4x4 blocks.
+#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
+pub struct ChunkBiomePos {
+    pub x: u8,
+    pub y: i32,
+    pub z: u8,
+}
+impl From<&BlockPos> for ChunkBiomePos {
+    #[inline]
+    fn from(pos: &BlockPos) -> Self {
+        ChunkBiomePos::from(&ChunkBlockPos::from(pos))
+    }
+}
+impl From<&ChunkBlockPos> for ChunkBiomePos {
+    #[inline]
+    fn from(pos: &ChunkBlockPos) -> Self {
+        ChunkBiomePos {
+            x: pos.x >> 2,
+            y: pos.y >> 2,
+            z: pos.z >> 2,
+        }
+    }
+}
+
 impl Add<ChunkSectionBlockPos> for ChunkSectionPos {
     type Output = BlockPos;
 
-- 
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