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lyra-engine
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Write a very experimental gltf loader

This commit is contained in:
SeanOMik 2023-09-21 23:11:09 -04:00
parent dddf6123c4
commit e76ca1ec50
Signed by: SeanOMik
GPG Key ID: 568F326C7EB33ACB
7 changed files with 342 additions and 29 deletions
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3
lyra-resource/Cargo.toml
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@ -7,7 +7,10 @@ edition = "2021"
[dependencies]
anyhow = "1.0.75"
base64 = "0.21.4"
glam = "0.24.1"
gltf = "1.3.0"
image = "0.24.7"
percent-encoding = "2.3.0"
thiserror = "1.0.48"
uuid = { version = "1.4.1", features = ["v4"] }

101
lyra-resource/src/loader/model.rs
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@ -1,4 +1,9 @@
use crate::{ResourceLoader, LoaderError, Mesh};
use std::sync::Arc;
use base64::Engine;
use glam::Vec3;
use crate::{ResourceLoader, LoaderError, Mesh, Vertex, Model};
impl From<gltf::Error> for LoaderError {
fn from(value: gltf::Error) -> Self {
@ -10,40 +15,56 @@ impl From<gltf::Error> for LoaderError {
pub struct ModelLoader;
impl ModelLoader {
fn process_node(&self, views: Vec<gltf::buffer::View<'_>>, node: gltf::Node<'_>) -> Vec<Mesh> {
fn parse_uri(uri: &str) -> Option<Vec<u8>> {
let uri = uri.strip_prefix("data")?;
let (mime, data) = uri.split_once(",")?;
let (_mime, is_base64) = match mime.strip_suffix(";base64") {
Some(mime) => (mime, true),
None => (mime, false),
};
if is_base64 {
base64::engine::general_purpose::STANDARD.decode(data).ok()
} else {
Some(data.as_bytes().to_vec())
}
}
fn process_node(&self, buffers: &Vec<Vec<u8>>, node: gltf::Node<'_>) -> Vec<Mesh> {
let mut meshes = vec![];
if let Some(mesh) = node.mesh() {
for prim in mesh.primitives() {
let pos_accessor = prim.get(&gltf::Semantic::Positions).unwrap();
let mut new_mesh = Mesh::default();
assert_eq!(pos_accessor.dimensions(), gltf::accessor::Dimensions::Vec3); // TODO: dont do this
let view = pos_accessor.view().unwrap(); // TODO: handle sparse Accessor
let stride = view.stride().unwrap_or(0); // if stride is None, its tightly packed
let offset = view.offset();
let buffer = view.buffer();
let buf_len = buffer.length();
let view = views.iter().next().unwrap();
//gltf.views()
//assert_eq!(pos_accessor.dimensions(), gltf::accessor::Dimensions::Vec3); // TODO: dont do this
//vertices.data_type() == gltf::
//new_mesh.vertices = vertices.;
let reader = prim.reader(|buf| Some(buffers[buf.index()].as_slice()));
let pos: Vec<Vec3> = reader.read_positions()
.unwrap()
.map(|pos| Vec3::new(pos[0], pos[1], pos[2]))
.collect();
if let Some(indicies) = prim.indices() {
let indices: Option<Vec<u32>> = reader.read_indices()
.map(|i| match i {
gltf::mesh::util::ReadIndices::U8(i) => i.map(|i| i as u32).collect(),
gltf::mesh::util::ReadIndices::U16(i) => i.map(|i| i as u32).collect(),
gltf::mesh::util::ReadIndices::U32(i) => i.collect(),
});
}
let mut new_mesh = Mesh::default();
new_mesh.vertices = pos.into_iter().map(|p| Vertex::new(p, glam::Vec2::new(0.0, 0.0))).collect();
new_mesh.indices = indices;
meshes.push(new_mesh);
}
//meshes.push(mesh);
}
for child in node.children() {
let mut child_meshes = self.process_node(node);
let mut child_meshes = self.process_node(buffers, child);
meshes.append(&mut child_meshes);
}
todo!()
meshes
}
}
@ -62,14 +83,44 @@ impl ResourceLoader for ModelLoader {
let gltf = gltf::Gltf::open(path)?;
let buffers: Vec<gltf::Buffer<'_>> = gltf.buffers().collect();
//let buffers: Vec<gltf::Buffer<'_>> = gltf.buffers().collect();
let buffers: Vec<Vec<u8>> = gltf.buffers().map(|b| match b.source() {
gltf::buffer::Source::Bin => gltf.blob.as_deref().map(|v| v.to_vec()),
gltf::buffer::Source::Uri(uri) => ModelLoader::parse_uri(uri),
}).flatten().collect();
// TODO: Read in multiple scenes
let scene = gltf.scenes().next().unwrap();
for node in scene.nodes() {
}
let meshes: Vec<Mesh> = scene.nodes()
.map(|node| self.process_node(&buffers, node))
.flatten().collect();
todo!()
Ok(Arc::new(Model::new(meshes)))
}
}
#[cfg(test)]
mod tests {
use crate::ResourceLoader;
use super::*;
fn test_file_path(path: &str) -> String {
let manifest = std::env::var("CARGO_MANIFEST_DIR").unwrap();
format!("{manifest}/test_files/gltf/{path}")
}
#[test]
fn test_loading() {
let path = test_file_path("test-embedded.gltf");
let loader = ModelLoader::default();
let model = loader.load(&path).unwrap();
let model = Arc::downcast::<Model>(model.as_arc_any()).unwrap();
let mesh = &model.meshes[0];
assert!(mesh.vertices.len() > 0);
assert!(mesh.indices.clone().unwrap().len() > 0);
}
}

25
lyra-resource/src/model.rs
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@ -2,17 +2,34 @@
#[repr(C)]
#[derive(Copy, Clone, Debug)]
pub struct Vertex {
pub position: [f32; 3],
pub tex_coords: [f32; 2]
pub position: glam::Vec3,
pub tex_coords: glam::Vec2
}
impl Vertex {
pub fn new(position: glam::Vec3, tex_coords: glam::Vec2) -> Self {
Self {
position,
tex_coords,
}
}
}
#[derive(Clone, Default)]
pub struct Mesh {
pub vertices: Vec<Vertex>,
pub indices: Option<Vec<u16>>,
pub indices: Option<Vec<u32>>,
}
pub struct Model {
pub mesh: Mesh,
pub meshes: Vec<Mesh>,
//pub material
}
impl Model {
pub fn new(meshes: Vec<Mesh>) -> Self {
Self {
meshes,
}
}
}

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lyra-resource/test_files/gltf/test-blobs.glb Normal file
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121
lyra-resource/test_files/gltf/test-embedded.gltf Normal file
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@ -0,0 +1,121 @@
{
"asset":{
"generator":"Khronos glTF Blender I/O v3.6.5",
"version":"2.0"
},
"scene":0,
"scenes":[
{
"name":"Scene",
"nodes":[
0
]
}
],
"nodes":[
{
"mesh":0,
"name":"Cube"
}
],
"materials":[
{
"doubleSided":true,
"name":"Material",
"pbrMetallicRoughness":{
"baseColorFactor":[
0.800000011920929,
0.800000011920929,
0.800000011920929,
1
],
"metallicFactor":0,
"roughnessFactor":0.5
}
}
],
"meshes":[
{
"name":"Cube",
"primitives":[
{
"attributes":{
"POSITION":0,
"TEXCOORD_0":1,
"NORMAL":2
},
"indices":3,
"material":0
}
]
}
],
"accessors":[
{
"bufferView":0,
"componentType":5126,
"count":24,
"max":[
1,
1,
1
],
"min":[
-1,
-1,
-1
],
"type":"VEC3"
},
{
"bufferView":1,
"componentType":5126,
"count":24,
"type":"VEC2"
},
{
"bufferView":2,
"componentType":5126,
"count":24,
"type":"VEC3"
},
{
"bufferView":3,
"componentType":5123,
"count":36,
"type":"SCALAR"
}
],
"bufferViews":[
{
"buffer":0,
"byteLength":288,
"byteOffset":0,
"target":34962
},
{
"buffer":0,
"byteLength":192,
"byteOffset":288,
"target":34962
},
{
"buffer":0,
"byteLength":288,
"byteOffset":480,
"target":34962
},
{
"buffer":0,
"byteLength":72,
"byteOffset":768,
"target":34963
}
],
"buffers":[
{
"byteLength":840,
"uri":"data:application/octet-stream;base64,AACAPwAAgD8AAIC/AACAPwAAgD8AAIC/AACAPwAAgD8AAIC/AACAPwAAgL8AAIC/AACAPwAAgL8AAIC/AACAPwAAgL8AAIC/AACAPwAAgD8AAIA/AACAPwAAgD8AAIA/AACAPwAAgD8AAIA/AACAPwAAgL8AAIA/AACAPwAAgL8AAIA/AACAPwAAgL8AAIA/AACAvwAAgD8AAIC/AACAvwAAgD8AAIC/AACAvwAAgD8AAIC/AACAvwAAgL8AAIC/AACAvwAAgL8AAIC/AACAvwAAgL8AAIC/AACAvwAAgD8AAIA/AACAvwAAgD8AAIA/AACAvwAAgD8AAIA/AACAvwAAgL8AAIA/AACAvwAAgL8AAIA/AACAvwAAgL8AAIA/AAAgPwAAAD8AACA/AAAAPwAAID8AAAA/AADAPgAAAD8AAMA+AAAAPwAAwD4AAAA/AAAgPwAAgD4AACA/AACAPgAAID8AAIA+AADAPgAAgD4AAMA+AACAPgAAwD4AAIA+AAAgPwAAQD8AACA/AABAPwAAYD8AAAA/AAAAPgAAAD8AAMA+AABAPwAAwD4AAEA/AAAgPwAAAAAAACA/AACAPwAAYD8AAIA+AAAAPgAAgD4AAMA+AAAAAAAAwD4AAIA/AAAAAAAAAAAAAIC/AAAAAAAAgD8AAACAAACAPwAAAAAAAACAAAAAAAAAgL8AAACAAAAAAAAAAAAAAIC/AACAPwAAAAAAAACAAAAAAAAAAAAAAIA/AAAAAAAAgD8AAACAAACAPwAAAAAAAACAAAAAAAAAgL8AAACAAAAAAAAAAAAAAIA/AACAPwAAAAAAAACAAACAvwAAAAAAAACAAAAAAAAAAAAAAIC/AAAAAAAAgD8AAACAAAAAAAAAgL8AAACAAACAvwAAAAAAAACAAAAAAAAAAAAAAIC/AAAAAAAAAAAAAIA/AACAvwAAAAAAAACAAAAAAAAAgD8AAACAAAAAAAAAgL8AAACAAAAAAAAAAAAAAIA/AACAvwAAAAAAAACAAQAOABQAAQAUAAcACgAGABIACgASABYAFwATAAwAFwAMABAADwADAAkADwAJABUABQACAAgABQAIAAsAEQANAAAAEQAAAAQA"
}
]
}

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lyra-resource/test_files/gltf/test-sep.bin Normal file
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121
lyra-resource/test_files/gltf/test-sep.gltf Normal file
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@ -0,0 +1,121 @@
{
"asset":{
"generator":"Khronos glTF Blender I/O v3.6.5",
"version":"2.0"
},
"scene":0,
"scenes":[
{
"name":"Scene",
"nodes":[
0
]
}
],
"nodes":[
{
"mesh":0,
"name":"Cube"
}
],
"materials":[
{
"doubleSided":true,
"name":"Material",
"pbrMetallicRoughness":{
"baseColorFactor":[
0.800000011920929,
0.800000011920929,
0.800000011920929,
1
],
"metallicFactor":0,
"roughnessFactor":0.5
}
}
],
"meshes":[
{
"name":"Cube",
"primitives":[
{
"attributes":{
"POSITION":0,
"TEXCOORD_0":1,
"NORMAL":2
},
"indices":3,
"material":0
}
]
}
],
"accessors":[
{
"bufferView":0,
"componentType":5126,
"count":24,
"max":[
1,
1,
1
],
"min":[
-1,
-1,
-1
],
"type":"VEC3"
},
{
"bufferView":1,
"componentType":5126,
"count":24,
"type":"VEC2"
},
{
"bufferView":2,
"componentType":5126,
"count":24,
"type":"VEC3"
},
{
"bufferView":3,
"componentType":5123,
"count":36,
"type":"SCALAR"
}
],
"bufferViews":[
{
"buffer":0,
"byteLength":288,
"byteOffset":0,
"target":34962
},
{
"buffer":0,
"byteLength":192,
"byteOffset":288,
"target":34962
},
{
"buffer":0,
"byteLength":288,
"byteOffset":480,
"target":34962
},
{
"buffer":0,
"byteLength":72,
"byteOffset":768,
"target":34963
}
],
"buffers":[
{
"byteLength":840,
"uri":"test-sep.bin"
}
]
}