converting a very simple two-mesh GLB to IQM

main
_ 2022-02-21 00:44:03 +00:00
parent d250cf12fa
commit ce29ce6ad1
3 changed files with 383 additions and 51 deletions

277
Cargo.lock generated
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@ -7,3 +7,5 @@ edition = "2021"
[dependencies] [dependencies]
byteorder = "1.4.3" byteorder = "1.4.3"
glam = "0.20.2"
gltf = "1.0.0"

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@ -3,59 +3,111 @@ use std::{
io::Write, io::Write,
}; };
use glam::{
Mat4,
Vec3,
};
fn main () { fn main () {
let vertexes = [ let (document, buffers, _images) = gltf::import ("input.glb").unwrap ();
[-1.0, -1.0, -1.0], let buffer = buffers.get (0).unwrap ();
[ 1.0, -1.0, -1.0],
[ 1.0, 1.0, -1.0],
[-1.0, 1.0, -1.0],
[-1.0, -1.0, 1.0], let mut vertexes = Vec::default ();
[ 1.0, -1.0, 1.0], let mut triangles = Vec::default ();
[ 1.0, 1.0, 1.0], let mut meshes = Vec::default ();
[-1.0, 1.0, 1.0], let mut texts = String::default ();
];
let triangles = [ for node in document.nodes () {
[0, 2, 1], let mesh = match node.mesh () {
[0, 3, 2], None => continue,
Some (x) => x,
};
[0, 5, 1], let m = gltf_node_get_mat4 (&node);
[1, 6, 2],
[2, 7, 3],
[3, 4, 0],
[0, 4, 5], for prim in mesh.primitives () {
[1, 5, 6], assert_eq! (prim.mode (), gltf::mesh::Mode::Triangles);
[2, 6, 7],
[3, 7, 4],
[4, 6, 5], let indices = prim.indices ().unwrap ();
[4, 7, 6], let indices_view = indices.view ().unwrap ();
]; let indices_offset = indices.offset () + indices_view.offset ();
let indices_slice = &buffer [indices_offset..(indices_offset + indices.count () * 2)];
let pos = prim.get (&gltf::Semantic::Positions).unwrap ();
let pos_view = pos.view ().unwrap ();
let pos_offset = pos.offset () + pos_view.offset ();
let pos_slice = &buffer [pos_offset..(pos_offset + pos.count () * 4 * 3)];
let first_vertex = vertexes.len ();
let mesh = iqm::Mesh {
name: u32::try_from (texts.len ()).unwrap (),
material: 0,
first_vertex: u32::try_from (first_vertex).unwrap (),
num_vertexes: u32::try_from (indices_slice.len () / 2).unwrap (),
// num_vertexes: u32::try_from (3).unwrap (),
first_triangle: u32::try_from (triangles.len ()).unwrap (),
num_triangles: u32::try_from (indices_slice.len () / 6).unwrap (),
//num_triangles: u32::try_from (1).unwrap (),
};
texts.push_str ("\0");
meshes.push (mesh);
for chunk in indices_slice.chunks_exact (2 * 3) {
let read_idx = |i: usize| u16::from_le_bytes ([chunk [i * 2 + 0], chunk [i * 2 + 1]]);
let idxs = [
read_idx (0),
read_idx (1),
read_idx (2),
];
let read_pos_coord = |i| f32::from_le_bytes ([
pos_slice [i * 4 + 0],
pos_slice [i * 4 + 1],
pos_slice [i * 4 + 2],
pos_slice [i * 4 + 3],
]);
let read_pos = move |i| {
let i = usize::try_from (i).unwrap ();
m.transform_point3 (Vec3::new (
read_pos_coord (i * 3 + 0),
read_pos_coord (i * 3 + 1),
read_pos_coord (i * 3 + 2),
))
};
let verts = [
read_pos (idxs [0]),
read_pos (idxs [2]),
read_pos (idxs [1]),
];
let tri_start = u32::try_from (vertexes.len ()).unwrap ();
triangles.push ([
tri_start + 0,
tri_start + 1,
tri_start + 2,
]);
for v in verts {
vertexes.push (v.to_array ());
}
}
}
}
let vertexes = vertexes;
let triangles = triangles;
let meshes = meshes;
let texts = texts;
let num_vertexes = u32::try_from (vertexes.len ()).unwrap (); let num_vertexes = u32::try_from (vertexes.len ()).unwrap ();
let num_triangles = u32::try_from (triangles.len ()).unwrap (); let num_triangles = u32::try_from (triangles.len ()).unwrap ();
let mut texts = Vec::default (); let num_text = texts.len ();
let mesh = iqm::Mesh {
name: u32::try_from (texts.len ()).unwrap (),
material: 0,
first_vertex: 0,
num_vertexes,
first_triangle: 0,
num_triangles,
};
texts.push ("Cube");
let meshes = vec! [
mesh,
];
let num_text: usize = texts.iter ()
.map (|s| s.len () + 1)
.sum ();
let num_text = u32::try_from (num_text).unwrap (); let num_text = u32::try_from (num_text).unwrap ();
let num_meshes = u32::try_from (meshes.len ()).unwrap (); let num_meshes = u32::try_from (meshes.len ()).unwrap ();
@ -69,7 +121,7 @@ fn main () {
let filesize = ofs_text + num_text; let filesize = ofs_text + num_text;
let mut f = File::create ("cube.iqm").unwrap (); let mut f = File::create ("output.iqm").unwrap ();
f.write_all (b"INTERQUAKEMODEL\0").unwrap (); f.write_all (b"INTERQUAKEMODEL\0").unwrap ();
@ -151,7 +203,7 @@ fn main () {
f.write_all (&(3u32.to_le_bytes ())).unwrap (); f.write_all (&(3u32.to_le_bytes ())).unwrap ();
// offset // offset
f.write_all (&(0xA8u32.to_le_bytes ())).unwrap (); f.write_all (&((ofs_vertexarrays + 5 * 4 * 1).to_le_bytes ())).unwrap ();
// Vertexes // Vertexes
@ -170,10 +222,11 @@ fn main () {
} }
// Text // Text
for s in texts { f.write_all (texts.as_bytes ()).unwrap ();
f.write_all (s.as_bytes ()).unwrap (); }
f.write_all (b"\0").unwrap ();
} fn gltf_node_get_mat4 (node: &gltf::Node) -> Mat4 {
Mat4::from_cols_array_2d (&node.transform ().matrix ())
} }
/// IQM structures as written to disk /// IQM structures as written to disk