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|
use std::{
io::{self, Cursor, Write},
ops::Add,
};
use azalea_buf::{AzBuf, BufReadError};
use azalea_core::{bitset::FixedBitSet, math, position::Vec3};
use azalea_entity::{LookDirection, Physics, Position};
/// 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, PartialEq)]
pub struct PositionMoveRotation {
pub pos: Vec3,
/// The updated delta movement (velocity).
pub delta: Vec3,
pub look_direction: LookDirection,
}
#[derive(Clone, Debug, Default, PartialEq)]
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 RelativeMovements {
pub fn all_absolute() -> Self {
RelativeMovements::default()
}
pub fn all_relative() -> Self {
RelativeMovements {
x: true,
y: true,
z: true,
y_rot: true,
x_rot: true,
delta_x: true,
delta_y: true,
delta_z: true,
rotate_delta: true,
}
}
pub fn apply(
&self,
change: &PositionMoveRotation,
position: &mut Position,
direction: &mut LookDirection,
physics: &mut Physics,
) {
let new_position = Vec3::new(
apply_change(position.x, self.x, change.pos.x),
apply_change(position.y, self.y, change.pos.y),
apply_change(position.z, self.z, change.pos.z),
);
let new_look_direction = LookDirection::new(
apply_change(direction.y_rot(), self.y_rot, change.look_direction.y_rot()),
apply_change(direction.x_rot(), self.x_rot, change.look_direction.x_rot()),
);
let mut new_delta = physics.velocity;
if self.rotate_delta {
let y_rot_delta = direction.y_rot() - new_look_direction.y_rot();
let x_rot_delta = direction.x_rot() - new_look_direction.x_rot();
new_delta = new_delta
.x_rot(math::to_radians(x_rot_delta as f64) as f32)
.y_rot(math::to_radians(y_rot_delta as f64) as f32);
}
let new_delta = Vec3::new(
apply_change(new_delta.x, self.delta_x, change.delta.x),
apply_change(new_delta.y, self.delta_y, change.delta.y),
apply_change(new_delta.z, self.delta_z, change.delta.z),
);
**position = new_position;
*direction = new_look_direction;
physics.velocity = new_delta;
}
}
fn apply_change<T: Add<Output = T>>(base: T, condition: bool, change: T) -> T {
if condition { base + change } else { change }
}
impl AzBuf for RelativeMovements {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
// yes minecraft seriously wastes that many bits, smh
let set = u32::azalea_read(buf)?;
let set = FixedBitSet::<32>::new_with_data(set.swap_bytes().to_be_bytes());
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),
})
}
fn azalea_write(&self, buf: &mut impl Write) -> io::Result<()> {
let mut set = FixedBitSet::<32>::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)
}
}
#[derive(Clone, Copy, Debug, Default, PartialEq)]
pub struct MoveFlags {
pub on_ground: bool,
pub horizontal_collision: bool,
}
impl AzBuf for MoveFlags {
fn azalea_read(buf: &mut Cursor<&[u8]>) -> Result<Self, BufReadError> {
let bitset = FixedBitSet::<8>::azalea_read(buf)?;
let on_ground = bitset.index(0);
let horizontal_collision = bitset.index(1);
Ok(Self {
on_ground,
horizontal_collision,
})
}
fn azalea_write(&self, buf: &mut impl io::Write) -> Result<(), io::Error> {
let mut bitset = FixedBitSet::<8>::new();
if self.on_ground {
bitset.set(0);
}
if self.horizontal_collision {
bitset.set(1);
}
bitset.azalea_write(buf)?;
Ok(())
}
}
|
