295 lines
7.3 KiB
Rust
295 lines
7.3 KiB
Rust
#[macro_use]
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extern crate iota;
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use std::convert::TryInto;
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use std::io::Cursor;
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use std::mem::size_of;
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use byteorder::{ByteOrder, LittleEndian, ReadBytesExt};
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pub mod names;
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pub mod zero_copy;
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pub use crate::names::consts;
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pub use crate::names::types;
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#[derive (Debug, Default)]
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pub struct Mesh {
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pub name: u32,
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pub material: u32,
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pub first_vertex: u32,
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pub num_vertexes: u32,
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pub first_triangle: u32,
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pub num_triangles: u32,
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}
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#[derive (Debug, Default)]
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pub struct Header {
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pub fields: [u32; 27],
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}
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#[derive (Debug, Default)]
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pub struct VertexArray {
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va_type: u32,
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va_flags: u32,
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va_format: u32,
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va_size: u32,
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va_offset: u32,
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}
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#[derive (Debug)]
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pub struct Model <'a> {
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data: &'a [u8],
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pub header: Header,
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text: Vec <u8>,
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pub meshes: Vec <Mesh>,
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vertexarrays: Vec <VertexArray>,
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}
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#[derive (Debug)]
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pub enum ModelLoadErr {
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BadMagic,
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UnsupportedVersion,
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ParseMeshFailed,
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ParseVertexArrayFailed,
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}
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use crate::names::MAGIC;
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impl Header {
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pub fn from_slice (input: &[u8]) -> Result <Header, ModelLoadErr> {
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if &input [0..MAGIC.len ()] != MAGIC {
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return Err (ModelLoadErr::BadMagic);
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}
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let input = &input [MAGIC.len ()..];
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let mut header = Header::default ();
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LittleEndian::read_u32_into (&input [0..header.fields.len () * size_of::<u32> ()], &mut header.fields);
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if header.fields [consts::VERSION] != 2 {
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return Err (ModelLoadErr::UnsupportedVersion);
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}
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Ok (header)
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}
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}
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impl Mesh {
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pub fn from_slice (input: &[u8]) -> Result <Mesh, ModelLoadErr> {
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let mut mesh = Mesh::default ();
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let mut rdr = Cursor::new (input);
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for field in [
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&mut mesh.name,
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&mut mesh.material,
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&mut mesh.first_vertex,
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&mut mesh.num_vertexes,
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&mut mesh.first_triangle,
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&mut mesh.num_triangles,
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].iter_mut () {
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**field = rdr.read_u32::<LittleEndian> ().map_err (|_| ModelLoadErr::ParseMeshFailed)?;
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}
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Ok (mesh)
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}
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}
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impl VertexArray {
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pub fn from_slice (input: &[u8]) -> Result <VertexArray, ModelLoadErr> {
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let mut va = VertexArray::default ();
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let mut rdr = Cursor::new (input);
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for field in [
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&mut va.va_type,
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&mut va.va_flags,
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&mut va.va_format,
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&mut va.va_size,
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&mut va.va_offset,
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].iter_mut () {
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**field = rdr.read_u32::<LittleEndian> ().map_err (|_| ModelLoadErr::ParseVertexArrayFailed)?;
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}
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Ok (va)
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}
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}
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impl <'a> Model <'a> {
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pub fn from_slice (data: &'a [u8]) -> Result <Model <'a>, ModelLoadErr> {
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let header = Header::from_slice (data)?;
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let text = {
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let offset: usize = header.fields [consts::OFS_TEXT].try_into ().unwrap ();
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let num: usize = header.fields [consts::NUM_TEXT].try_into ().unwrap ();
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Vec::from (&data [offset..offset + num])
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};
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let meshes = {
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let num: usize = header.fields [consts::NUM_MESHES].try_into ().unwrap ();
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let mut meshes = Vec::with_capacity (num);
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let mesh_size = 6 * 4;
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let meshes_offset: usize = header.fields [consts::OFS_MESHES].try_into ().unwrap ();
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for i in 0..num {
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let offset = meshes_offset + i * mesh_size;
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let mesh_slice = &data [offset..offset + mesh_size];
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let mesh = Mesh::from_slice (mesh_slice)?;
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meshes.push (mesh);
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}
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meshes
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};
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let vertexarrays = {
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let num: usize = header.fields [consts::NUM_VERTEXARRAYS].try_into ().unwrap ();
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let mut vertexarrays = Vec::with_capacity (num);
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let vertexarray_size = 5 * 4;
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let vertexarrays_offset: usize = header.fields [consts::OFS_VERTEXARRAYS].try_into ().unwrap ();
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for i in 0..num {
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let offset = vertexarrays_offset + i * vertexarray_size;
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let vertexarray_slice = &data [offset..offset + vertexarray_size];
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let vertexarray = VertexArray::from_slice (vertexarray_slice)?;
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vertexarrays.push (vertexarray);
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}
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vertexarrays
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};
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Ok (Model {
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data,
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header,
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text,
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meshes,
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vertexarrays,
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})
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}
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pub fn get_vertex_slice (&self,
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vertexarray_index: usize
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) -> &[u8]
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{
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let vertexarray = &self.vertexarrays [vertexarray_index];
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let bytes_per_float = 4;
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let stride = bytes_per_float * vertexarray.va_size;
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//assert_eq! (stride, 12);
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let offset: usize = (vertexarray.va_offset).try_into ().unwrap ();
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let num_bytes: usize = (stride * self.header.fields [consts::NUM_VERTEXES]).try_into ().unwrap ();
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&self.data [offset..offset + num_bytes]
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}
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pub fn get_index_slice (&self, mesh_index: usize) -> &[u8] {
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let mesh = &self.meshes [mesh_index];
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let bytes_per_u32 = 4;
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let indexes_per_tri = 3;
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let stride = bytes_per_u32 * indexes_per_tri;
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let offset: usize = (self.header.fields [consts::OFS_TRIANGLES] + stride * mesh.first_triangle).try_into ().unwrap ();
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let num_bytes: usize = (stride * mesh.num_triangles).try_into ().unwrap ();
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&self.data [offset..offset + num_bytes]
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}
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pub fn get_all_indexes (&self) -> &[u8] {
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let bytes_per_u32 = 4;
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let indexes_per_tri = 3;
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let stride = bytes_per_u32 * indexes_per_tri;
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let offset: usize = self.header.fields [consts::OFS_TRIANGLES].try_into ().unwrap ();
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let num_bytes: usize = (stride * self.header.fields [consts::NUM_TRIANGLES]).try_into ().unwrap ();
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&self.data [offset..offset + num_bytes]
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}
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// I don't think IQM makes any guarantees about UTF-8
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// so I will only say that the slice has no NULs
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pub fn get_mesh_name (&self, index: usize) -> &[u8] {
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let mesh = &self.meshes [index];
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let ofs: usize = (self.header.fields [consts::OFS_TEXT] + mesh.name).try_into ().unwrap ();
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// There should be an easy way to do this with CString?
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let mut nul_index = None;
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for (j, c) in self.data [ofs..].iter ().enumerate () {
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if *c == 0 {
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nul_index = Some (j);
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break;
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}
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}
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let nul_index = nul_index.unwrap ();
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&self.data [ofs..ofs + nul_index]
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}
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}
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#[cfg (test)]
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mod test {
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use std::path::Path;
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fn load_file <P: AsRef <Path>> (filename: P) -> Vec <u8> {
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use std::convert::TryInto;
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use std::fs::File;
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use std::io::Read;
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let mut f = File::open (filename).unwrap ();
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let mut data = vec! [0u8; f.metadata ().unwrap ().len ().try_into ().unwrap ()];
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f.read_exact (&mut data).unwrap ();
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data
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}
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#[test]
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pub fn load_models () {
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use super::*;
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let airplane_bytes = load_file ("airplane.iqm");
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let arrow_bytes = load_file ("arrow.iqm");
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let truk_bytes = load_file ("truk.iqm");
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let airplane = Model::from_slice (&airplane_bytes).unwrap ();
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let arrow = Model::from_slice (&arrow_bytes).unwrap ();
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let truk = Model::from_slice (&truk_bytes).unwrap ();
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use crate::names::consts::*;
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assert_eq! (airplane.header.fields [NUM_VERTEXES], 304);
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assert_eq! (airplane.header.fields [NUM_TRIANGLES], 156);
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assert_eq! (airplane.meshes.len (), 1);
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assert_eq! (airplane.vertexarrays.len (), 4);
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assert_eq! (arrow.header.fields [NUM_VERTEXES], 109);
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assert_eq! (arrow.header.fields [NUM_TRIANGLES], 117);
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assert_eq! (arrow.meshes.len (), 1);
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assert_eq! (arrow.vertexarrays.len (), 4);
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assert_eq! (truk.header.fields [NUM_VERTEXES], 256);
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assert_eq! (truk.header.fields [NUM_TRIANGLES], 180);
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assert_eq! (truk.meshes.len (), 5);
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assert_eq! (truk.vertexarrays.len (), 4);
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}
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#[test]
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pub fn load_zero_copy () {
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use crate::zero_copy::*;
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let airplane_bytes = load_file ("airplane.iqm");
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let arrow_bytes = load_file ("arrow.iqm");
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let truk_bytes = load_file ("truk.iqm");
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let airplane = Model::get_root (&airplane_bytes);
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let arrow = Model::get_root (&arrow_bytes);
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let truk = Model::get_root (&truk_bytes);
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}
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}
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