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use crate::packets::Resource;
use anyhow::{Result, anyhow};
use log::warn;
use std::io::{Read, Write};
#[derive(Debug, Default, Clone)]
pub struct Prefab(pub Vec<Resource>);
#[derive(Debug, Default, Clone)]
pub struct Part {
pub vertex: Vec<Resource>,
pub index: Option<Resource>,
pub armature: Option<Resource>,
pub fragment_shader: Option<Resource>,
pub fragment_shader_data: Option<Resource>,
pub vertex_shader: Option<Resource>,
pub vertex_shader_data: Option<Resource>,
pub texture: Option<Resource>,
}
pub struct VertexAttributes(Vec<f32>);
pub struct Indecies(Vec<[u16; 3]>);
impl Prefab {
pub fn serialize(&self, w: &mut Vec<u8>) -> Result<()> {
for x in self.0.clone() {
w.write_all(&x.0)?;
}
Ok(())
}
pub fn deserialize(r: &[u8]) -> Result<Self> {
let mut s = Prefab::default();
for x in r.iter().array_chunks::<32>() {
s.0.push(Resource(x.map(|x| *x)))
}
Ok(s)
}
}
impl Indecies {
pub fn serialize(&self, w: &mut Vec<u8>) -> Result<()> {
for x in self.0.clone() {
w.write_all(x.map(|x| x.to_be_bytes()).as_flattened())?;
}
Ok(())
}
pub fn deserialize(r: &[u8]) -> Result<Self> {
let mut s = Self(Vec::new());
for x in r.iter().array_chunks::<2>().array_chunks::<3>() {
s.0.push(x.map(|x| u16::from_be_bytes(x.map(|x| *x))))
}
Ok(s)
}
}
impl VertexAttributes {
pub fn serialize(&self, w: &mut Vec<u8>) -> Result<()> {
for x in self.0.clone() {
w.write_all(&x.to_be_bytes())?;
}
Ok(())
}
pub fn deserialize(r: &[u8]) -> Result<Self> {
let mut s = Self(Vec::new());
for x in r.iter().array_chunks::<4>() {
s.0.push(f32::from_be_bytes(x.map(|x| *x)))
}
Ok(s)
}
}
impl Part {
pub fn serialize(&self, w: &mut Vec<u8>) -> Result<()> {
for x in &self.vertex {
write_kv(w, b"vertex", &x.0)?;
}
if let Some(x) = &self.index {
write_kv(w, b"index", &x.0)?;
}
if let Some(x) = &self.armature {
write_kv(w, b"armature", &x.0)?;
}
if let Some(x) = &self.fragment_shader {
write_kv(w, b"fragment_shader", &x.0)?;
}
if let Some(x) = &self.fragment_shader_data {
write_kv(w, b"fragment_shader_data", &x.0)?;
}
if let Some(x) = &self.vertex_shader {
write_kv(w, b"vertex_shader", &x.0)?;
}
if let Some(x) = &self.vertex_shader_data {
write_kv(w, b"vertex_shader_data", &x.0)?;
}
if let Some(x) = &self.texture {
write_kv(w, b"texture", &x.0)?;
}
Ok(())
}
pub fn deserialize(mut r: &[u8]) -> Result<Self> {
let mut s = Self::default();
while !r.is_empty() {
let (k, v) = read_kv(&mut r)?;
match k.as_slice() {
b"vertex" => s.vertex.push(slice_to_res(&v)?),
b"index" => s.index = Some(slice_to_res(&v)?),
b"armature" => s.armature = Some(slice_to_res(&v)?),
b"fragment_shader" => s.fragment_shader = Some(slice_to_res(&v)?),
b"fragment_shader_data" => s.fragment_shader_data = Some(slice_to_res(&v)?),
b"vertex_shader" => s.vertex_shader = Some(slice_to_res(&v)?),
b"vertex_shader_data" => s.vertex_shader_data = Some(slice_to_res(&v)?),
b"texture" => s.texture = Some(slice_to_res(&v)?),
_ => warn!("unknown part key"),
}
}
Ok(s)
}
}
fn slice_to_res(s: &[u8]) -> Result<Resource> {
Ok(Resource(
s.try_into()
.map_err(|_| anyhow!("resource length incorrect"))?,
))
}
fn read_kv(r: &mut &[u8]) -> Result<(Vec<u8>, Vec<u8>)> {
let mut key_size = [0; 2];
let mut value_size = [0; 2];
r.read_exact(&mut key_size)?;
r.read_exact(&mut value_size)?;
let key_size = u16::from_be_bytes(key_size);
let value_size = u16::from_be_bytes(value_size);
let mut key = vec![0; key_size as usize];
let mut value = vec![0; value_size as usize];
r.read_exact(&mut value)?;
r.read_exact(&mut key)?;
Ok((key, value))
}
fn write_kv(w: &mut Vec<u8>, key: &[u8], value: &[u8]) -> Result<()> {
w.write_all(&(key.len() as u16).to_be_bytes())?;
w.write_all(&(value.len() as u16).to_be_bytes())?;
w.write_all(key)?;
w.write_all(value)?;
Ok(())
}
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