1 files changed, 68 insertions, 0 deletions
diff --git a/azalea-core/src/delta.rs b/azalea-core/src/delta.rs
new file mode 100644
index 00000000..c0056411
--- /dev/null
+++ b/azalea-core/src/delta.rs
@@ -0,0 +1,68 @@
+use crate::EntityPos;
+pub use azalea_buf::McBuf;
+
+pub trait PositionDeltaTrait {
+    fn x(&self) -> f64;
+    fn y(&self) -> f64;
+    fn z(&self) -> f64;
+}
+
+#[derive(Clone, Debug, McBuf, Default)]
+pub struct PositionDelta {
+    pub xa: f64,
+    pub ya: f64,
+    pub za: f64,
+}
+
+/// Only works for up to 8 blocks
+#[derive(Clone, Debug, McBuf, Default)]
+pub struct PositionDelta8 {
+    pub xa: i16,
+    pub ya: i16,
+    pub za: i16,
+}
+
+impl PositionDeltaTrait for PositionDelta {
+    fn x(&self) -> f64 {
+        self.xa
+    }
+    fn y(&self) -> f64 {
+        self.ya
+    }
+    fn z(&self) -> f64 {
+        self.za
+    }
+}
+
+impl PositionDelta8 {
+    #[deprecated]
+    pub fn float(&self) -> (f64, f64, f64) {
+        (
+            (self.xa as f64) / 4096.0,
+            (self.ya as f64) / 4096.0,
+            (self.za as f64) / 4096.0,
+        )
+    }
+}
+
+impl PositionDeltaTrait for PositionDelta8 {
+    fn x(&self) -> f64 {
+        (self.xa as f64) / 4096.0
+    }
+    fn y(&self) -> f64 {
+        (self.ya as f64) / 4096.0
+    }
+    fn z(&self) -> f64 {
+        (self.za as f64) / 4096.0
+    }
+}
+
+impl EntityPos {
+    pub fn with_delta(&self, delta: &dyn PositionDeltaTrait) -> EntityPos {
+        EntityPos {
+            x: self.x + delta.x(),
+            y: self.y + delta.y(),
+            z: self.z + delta.z(),
+        }
+    }
+}