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|
#![feature(array_chunks)]
use anyhow::{Result, anyhow};
use glam::{Affine3A, Mat4};
use gltf::{Glb, Semantic, mesh::Mode};
use gltf_json::{
Accessor, Index, Node, Root, Scene,
accessor::GenericComponentType,
mesh::Primitive,
validation::{Checked, USize64},
};
use log::warn;
use std::{borrow::Cow, collections::BTreeMap, env::args, fs::File, io::BufReader};
use unity_tools::{
classes::{
gameobject::GameObject,
mesh::{Mesh, VertexDataChannel},
mesh_renderer::SkinnedMeshRenderer,
transform::Transform,
},
serialized_file::SerializedFile,
unityfs::UnityFS,
};
fn main() -> anyhow::Result<()> {
env_logger::init_from_env("LOG");
let file = BufReader::new(File::open(args().nth(1).unwrap()).unwrap());
let fs = UnityFS::open(file)?;
let cabfile = fs
.find_main_file()
.ok_or(anyhow!("no CAB file found"))?
.to_owned();
let mut cab = fs.read(&cabfile)?;
let mut file = SerializedFile::read(&mut cab)?;
let gameobjects = file
.objects
.iter()
.filter(|ob| file.get_object_type_tree(ob).unwrap().type_string == "GameObject")
.cloned()
.collect::<Vec<_>>();
// let mut root_tr = Transform::from_value(file.read_object(ob)?)?;
// while !root_tr.father.is_null() {
// root_tr = root_tr.father.load(&mut file)?;
// }
// eprintln!("{root_tr:?}");
let mut root = gltf_json::Root::default();
let mut nodes = Vec::new();
let mut buffer = Vec::new();
for ob in gameobjects {
let go = file.read_object(ob)?.parse::<GameObject>()?;
let mut global_transform = Affine3A::default();
for comp in go.components {
let ob = comp.load(&mut file, None)?;
match ob.class_name().unwrap().as_str() {
"Transform" => {
let mut tr = ob.parse::<Transform>()?;
let mut transforms = Vec::new();
loop {
transforms.push(
Mat4::from_translation(tr.local_position)
* Mat4::from_scale(tr.local_scale)
* Mat4::from_quat(tr.local_rotation),
);
if tr.father.is_null() {
break;
} else {
tr = tr.father.load(&mut file, None)?;
}
}
global_transform =
Affine3A::from_mat4(transforms.into_iter().reduce(|a, b| a * b).unwrap())
}
"SkinnedMeshRenderer" => {
let smr = ob.parse::<SkinnedMeshRenderer>()?;
let mesh = import_mesh(
&mut root,
&mut buffer,
smr.mesh_renderer.mesh.load(&mut file, None)?,
)?;
nodes.push(root.push(Node {
mesh: Some(mesh),
..Default::default()
}));
}
"MeshRenderer" => {
// let mr = ob.parse::<MeshRenderer>()?;
}
x => warn!("unknown component {x:?}"),
}
}
}
root.push(Scene {
extensions: Default::default(),
extras: Default::default(),
name: None,
nodes,
});
let json_string = gltf_json::serialize::to_string(&root).expect("Serialization error");
let mut json_offset = json_string.len();
align_to_multiple_of_four(&mut json_offset);
let glb = Glb {
header: gltf::binary::Header {
magic: *b"glTF",
version: 2,
length: json_offset as u32,
},
bin: Some(Cow::Owned(buffer)),
json: Cow::Owned(json_string.into_bytes()),
};
let writer = std::fs::File::create("/tmp/a.glb").expect("I/O error");
glb.to_writer(writer).expect("glTF binary output error");
Ok(())
}
fn align_to_multiple_of_four(n: &mut usize) {
*n = (*n + 3) & !3;
}
pub fn import_mesh(
root: &mut Root,
buffer: &mut Vec<u8>,
mesh: Mesh,
) -> Result<Index<gltf_json::Mesh>> {
let indicies = mesh.read_indecies();
let (pdim, positions) = mesh
.vertex_data
.read_channel(VertexDataChannel::Position)
.ok_or(anyhow!("mesh has no positions"))?;
assert_eq!(pdim, 3);
let positions = {
let buffer_length = positions.len() * size_of::<[f32; 3]>();
let buffer = root.push(gltf_json::Buffer {
byte_length: USize64::from(buffer_length),
name: None,
uri: None,
extensions: Default::default(),
extras: Default::default(),
});
let buffer_view = root.push(gltf_json::buffer::View {
buffer,
byte_length: USize64::from(buffer_length),
byte_offset: None,
byte_stride: Some(gltf_json::buffer::Stride(size_of::<[f32; 3]>())),
name: None,
target: Some(Checked::Valid(gltf_json::buffer::Target::ArrayBuffer)),
extensions: Default::default(),
extras: Default::default(),
});
root.push(Accessor {
buffer_view: Some(buffer_view),
byte_offset: Some(USize64(0)),
count: USize64::from(positions.len()),
component_type: Checked::Valid(GenericComponentType(
gltf_json::accessor::ComponentType::F32,
)),
extensions: Default::default(),
extras: Default::default(),
type_: Checked::Valid(gltf_json::accessor::Type::Vec3),
max: None,
min: None,
name: None,
normalized: false,
sparse: None,
})
};
let indices = {
let offset = buffer.len();
let num_indices = indicies.len();
buffer.extend(indicies.into_iter().flatten().flat_map(u32::to_le_bytes));
let buffer_length = num_indices * size_of::<u32>() * 3;
let buffer = root.push(gltf_json::Buffer {
byte_length: USize64::from(buffer_length),
name: None,
uri: None,
extensions: Default::default(),
extras: Default::default(),
});
let buffer_view = root.push(gltf_json::buffer::View {
buffer,
byte_length: USize64::from(buffer_length),
byte_offset: Some(USize64::from(offset)),
byte_stride: Some(gltf_json::buffer::Stride(size_of::<u32>())),
name: None,
target: Some(Checked::Valid(gltf_json::buffer::Target::ArrayBuffer)),
extensions: Default::default(),
extras: Default::default(),
});
root.push(Accessor {
buffer_view: Some(buffer_view),
byte_offset: Some(USize64(0)),
count: USize64::from(num_indices * 3),
component_type: Checked::Valid(GenericComponentType(
gltf_json::accessor::ComponentType::U32,
)),
extensions: Default::default(),
extras: Default::default(),
type_: Checked::Valid(gltf_json::accessor::Type::Vec3),
max: None,
min: None,
name: None,
normalized: false,
sparse: None,
})
};
let primitive = Primitive {
attributes: {
let mut map = BTreeMap::new();
map.insert(Checked::Valid(Semantic::Positions), positions);
map
},
extensions: Default::default(),
extras: Default::default(),
indices: Some(indices),
material: None,
mode: Checked::Valid(Mode::Triangles),
targets: None,
};
let mesh = root.push(gltf_json::Mesh {
extensions: Default::default(),
extras: Default::default(),
name: None,
primitives: vec![primitive],
weights: None,
});
Ok(mesh)
}
|
