fix incorrect packets

1 files changed, 71 insertions, 0 deletions

diff --git a/azalea-protocol/src/common/movements.rs b/azalea-protocol/src/common/movements.rs
new file mode 100644
index 00000000..7672703f
--- /dev/null
+++ b/azalea-protocol/src/common/movements.rs
@@ -0,0 +1,71 @@
+use std::io::{self, Cursor, Write};
+
+use azalea_buf::{AzBuf, AzaleaRead, AzaleaWrite, BufReadError};
+use azalea_core::{bitset::FixedBitSet, position::Vec3};
+use azalea_entity::LookDirection;
+
+/// The updated position, velocity, and rotations for an entity.
+///
+/// Often, this field comes alongside a [`RelativeMovements`] field, which
+/// specifies which parts of this struct should be treated as relative.
+#[derive(AzBuf, Clone, Debug)]
+pub struct PositionMoveRotation {
+    pub pos: Vec3,
+    /// The updated delta movement (velocity).
+    pub delta: Vec3,
+    pub look_direction: LookDirection,
+}
+
+#[derive(Debug, Clone)]
+pub struct RelativeMovements {
+    pub x: bool,
+    pub y: bool,
+    pub z: bool,
+    pub y_rot: bool,
+    pub x_rot: bool,
+    pub delta_x: bool,
+    pub delta_y: bool,
+    pub delta_z: bool,
+    pub rotate_delta: bool,
+}
+
+impl AzaleaRead for RelativeMovements {
+    fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
+        // yes minecraft seriously wastes that many bits, smh
+        let set = FixedBitSet::<{ 32_usize.div_ceil(8) }>::azalea_read(buf)?;
+        Ok(RelativeMovements {
+            x: set.index(0),
+            y: set.index(1),
+            z: set.index(2),
+            y_rot: set.index(3),
+            x_rot: set.index(4),
+            delta_x: set.index(5),
+            delta_y: set.index(6),
+            delta_z: set.index(7),
+            rotate_delta: set.index(8),
+        })
+    }
+}
+
+impl AzaleaWrite for RelativeMovements {
+    fn azalea_write(&self, buf: &mut impl Write) -> Result<(), io::Error> {
+        let mut set = FixedBitSet::<{ 32_usize.div_ceil(8) }>::new();
+        let mut set_bit = |index: usize, value: bool| {
+            if value {
+                set.set(index);
+            }
+        };
+
+        set_bit(0, self.x);
+        set_bit(1, self.y);
+        set_bit(2, self.z);
+        set_bit(3, self.y_rot);
+        set_bit(4, self.x_rot);
+        set_bit(5, self.delta_x);
+        set_bit(6, self.delta_y);
+        set_bit(7, self.delta_z);
+        set_bit(8, self.rotate_delta);
+
+        set.azalea_write(buf)
+    }
+}