nif 0.4.0

A super-primitive Gamebryo NIF parser targeting version 20.0.0.4
Documentation 
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use binread::{
    io::{Read, Seek},
    BinRead, BinReaderExt,
};

use super::NiBound;
use crate::common::NiTransform;

#[derive(Debug, PartialEq, BinRead)]
pub struct NiSkinData {
    pub skin_transform: NiTransform,
    pub num_bones: u32,
    pub has_vertex_weights: u8,
    #[br(count = num_bones, args(has_vertex_weights))]
    pub bone_list: Vec<BoneData>,
}

#[derive(Debug, PartialEq, BinRead)]
#[br(import(has_vertex_weights: u8))]
pub struct BoneData {
    pub skin_transform: NiTransform,
    pub bounding_sphere: NiBound,
    pub num_vertices: u16,
    #[br(if(has_vertex_weights != 0), count = num_vertices)]
    pub vertex_weights: Option<Vec<BoneVertData>>,
}

#[derive(Debug, PartialEq, BinRead)]
pub struct BoneVertData {
    pub index: u16,
    pub weight: f32,
}

impl NiSkinData {
    pub fn parse<R: Read + Seek>(reader: &mut R) -> anyhow::Result<Self> {
        Ok(reader.read_le()?)
    }
}