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use anyhow::{Result, bail};
use glam::Vec3;
use std::io::{Read, Write};
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Resource(pub [u8; 32]);
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Object(pub u128);
#[derive(Debug, Clone)]
pub enum Packet {
RequestResource(Resource),
RespondResource(Vec<u8>),
Add(Object, Resource),
Remove(Object),
Position(Object, Vec3, Vec3),
Pose(Object, Vec<f32>),
Parent(Object, Object),
Sound(Object, Vec<u8>),
}
impl Object {
pub fn new() -> Self {
Self(rand::random())
}
}
impl Packet {
pub fn serialize(&self, w: &mut impl Write) -> Result<()> {
match self {
Packet::RequestResource(resource) => {
w.write_all(&[0x01])?;
w.write_all(&resource.0)?;
}
Packet::RespondResource(data) => {
w.write_all(&[0x02])?;
w.write_all(&(data.len() as u16).to_be_bytes())?;
w.write_all(&data)?;
}
Packet::Add(object, resource) => {
w.write_all(&[0x03])?;
w.write_all(&object.0.to_be_bytes())?;
w.write_all(&resource.0)?;
}
Packet::Remove(object) => {
w.write_all(&[0x04])?;
w.write_all(&object.0.to_be_bytes())?;
}
Packet::Position(object, pos, rot) => {
w.write_all(&[0x05])?;
w.write_all(&object.0.to_be_bytes())?;
w.write_all(&pos.x.to_be_bytes())?;
w.write_all(&pos.y.to_be_bytes())?;
w.write_all(&pos.z.to_be_bytes())?;
w.write_all(&rot.x.to_be_bytes())?;
w.write_all(&rot.y.to_be_bytes())?;
w.write_all(&rot.z.to_be_bytes())?;
}
Packet::Pose(object, vec) => {
w.write_all(&[0x06])?;
w.write_all(&object.0.to_be_bytes())?;
w.write_all(&(vec.len() as u16).to_be_bytes())?;
}
Packet::Parent(parent, child) => {
w.write_all(&[0x07])?;
w.write_all(&parent.0.to_be_bytes())?;
w.write_all(&child.0.to_be_bytes())?;
}
Packet::Sound(object, vec) => {
w.write_all(&[0x08])?;
w.write_all(&object.0.to_be_bytes())?;
w.write_all(&(vec.len() as u16).to_be_bytes())?;
}
}
Ok(())
}
pub fn deserialize(r: &mut impl Read) -> Result<Self> {
let mut tag = [0u8; 1];
r.read_exact(&mut tag)?;
Ok(match tag[0] {
0x01 => Packet::RequestResource(read_res(r)?),
0x02 => Packet::RespondResource(read_data(r)?),
0x03 => Packet::Add(Object(read_u128(r)?), read_res(r)?),
0x04 => Packet::Remove(Object(read_u128(r)?)),
0x05 => Packet::Position(
Object(read_u128(r)?),
Vec3::new(read_float(r)?, read_float(r)?, read_float(r)?),
Vec3::new(read_float(r)?, read_float(r)?, read_float(r)?),
),
0x06 => Packet::Pose(Object(read_u128(r)?), read_params(r)?),
0x07 => Packet::Parent(Object(read_u128(r)?), Object(read_u128(r)?)),
0x08 => Packet::Sound(Object(read_u128(r)?), read_data(r)?),
_ => bail!("unknown packet tag"),
})
}
}
fn read_u128(r: &mut impl Read) -> Result<u128> {
let mut buf = [0; 16];
r.read_exact(&mut buf)?;
Ok(u128::from_be_bytes(buf))
}
fn read_res(r: &mut impl Read) -> Result<Resource> {
let mut buf = [0; 32];
r.read_exact(&mut buf)?;
Ok(Resource(buf))
}
fn read_data(r: &mut impl Read) -> Result<Vec<u8>> {
let mut size = [0; 2];
r.read_exact(&mut size)?;
let size = u16::from_be_bytes(size);
let mut buf = vec![0; size as usize];
r.read_exact(&mut buf)?;
Ok(buf)
}
fn read_float(r: &mut impl Read) -> Result<f32> {
let mut buf = [0; 4];
r.read_exact(&mut buf)?;
Ok(f32::from_be_bytes(buf))
}
fn read_params(r: &mut impl Read) -> Result<Vec<f32>> {
let mut size = [0; 2];
r.read_exact(&mut size)?;
let size = u16::from_be_bytes(size);
let mut v = Vec::with_capacity(size as usize);
for _ in 0..size {
v.push(read_float(r)?);
}
Ok(v)
}
|
