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use crate::core::*;
use crate::io::*;
use ::gltf::Gltf;
use std::path::Path;
impl Loaded {
pub fn gltf(
&mut self,
path: impl AsRef<Path>,
) -> ThreeDResult<(Vec<CPUMesh>, Vec<CPUMaterial>)> {
let mut cpu_meshes = Vec::new();
let mut cpu_materials = Vec::new();
let Gltf { document, mut blob } = Gltf::from_slice(self.get_bytes(path.as_ref())?)?;
let base_path = path.as_ref().parent().unwrap();
let mut buffers = Vec::new();
for buffer in document.buffers() {
let mut data = match buffer.source() {
::gltf::buffer::Source::Uri(uri) => self.remove_bytes(base_path.join(uri))?,
::gltf::buffer::Source::Bin => blob.take().ok_or(IOError::GltfMissingData)?,
};
if data.len() < buffer.length() {
Err(IOError::GltfCorruptData)?;
}
while data.len() % 4 != 0 {
data.push(0);
}
buffers.push(::gltf::buffer::Data(data));
}
for scene in document.scenes() {
for node in scene.nodes() {
parse_tree(
&node,
self,
&base_path,
&buffers,
&mut cpu_meshes,
&mut cpu_materials,
)?;
}
}
Ok((cpu_meshes, cpu_materials))
}
}
fn parse_tree<'a>(
node: &::gltf::Node,
loaded: &mut Loaded,
path: &Path,
buffers: &[::gltf::buffer::Data],
cpu_meshes: &mut Vec<CPUMesh>,
cpu_materials: &mut Vec<CPUMaterial>,
) -> ThreeDResult<()> {
if let Some(mesh) = node.mesh() {
let name: String = mesh
.name()
.map(|s| s.to_string())
.unwrap_or(format!("index {}", mesh.index()));
for primitive in mesh.primitives() {
let reader = primitive.reader(|buffer| Some(&buffers[buffer.index()]));
if let Some(read_positions) = reader.read_positions() {
let mut positions = Vec::new();
for value in read_positions {
positions.push(value[0]);
positions.push(value[1]);
positions.push(value[2]);
}
let normals = reader
.read_normals()
.map(|values| values.flatten().collect::<Vec<_>>());
let tangents = reader
.read_tangents()
.map(|values| values.flatten().collect::<Vec<_>>());
let indices = reader.read_indices().map(|values| match values {
::gltf::mesh::util::ReadIndices::U8(iter) => {
let mut inds = Vec::new();
for value in iter {
inds.push(value);
}
Indices::U8(inds)
}
::gltf::mesh::util::ReadIndices::U16(iter) => {
let mut inds = Vec::new();
for value in iter {
inds.push(value);
}
Indices::U16(inds)
}
::gltf::mesh::util::ReadIndices::U32(iter) => {
let mut inds = Vec::new();
for value in iter {
inds.push(value);
}
Indices::U32(inds)
}
});
let material = primitive.material();
let material_name: String = material.name().map(|s| s.to_string()).unwrap_or(
material
.index()
.map(|i| format!("index {}", i))
.unwrap_or("default".to_string()),
);
let mut parsed = false;
for material in cpu_materials.iter() {
if material.name == material_name {
parsed = true;
break;
}
}
if !parsed {
let pbr = material.pbr_metallic_roughness();
let color = pbr.base_color_factor();
let albedo_texture = if let Some(info) = pbr.base_color_texture() {
Some(parse_texture(loaded, path, buffers, info.texture())?)
} else {
None
};
let metallic_roughness_texture =
if let Some(info) = pbr.metallic_roughness_texture() {
Some(parse_texture(loaded, path, buffers, info.texture())?)
} else {
None
};
let (normal_texture, normal_scale) =
if let Some(normal) = material.normal_texture() {
(
Some(parse_texture(loaded, path, buffers, normal.texture())?),
normal.scale(),
)
} else {
(None, 1.0)
};
let (occlusion_texture, occlusion_strength) =
if let Some(occlusion) = material.occlusion_texture() {
(
Some(parse_texture(loaded, path, buffers, occlusion.texture())?),
occlusion.strength(),
)
} else {
(None, 1.0)
};
let emissive_texture = if let Some(info) = material.emissive_texture() {
Some(parse_texture(loaded, path, buffers, info.texture())?)
} else {
None
};
cpu_materials.push(CPUMaterial {
name: material_name.clone(),
albedo: Color::from_rgba_slice(&color),
albedo_texture,
metallic: pbr.metallic_factor(),
roughness: pbr.roughness_factor(),
metallic_roughness_texture,
normal_texture,
normal_scale,
occlusion_texture,
occlusion_strength,
occlusion_metallic_roughness_texture: None,
emissive: Color::from_rgb_slice(&material.emissive_factor()),
emissive_texture,
alpha_cutout: None,
});
}
let colors = reader.read_colors(0).map(|values| {
let mut cols = Vec::new();
for value in values.into_rgb_u8() {
cols.push(value[0]);
cols.push(value[1]);
cols.push(value[2]);
}
cols
});
let uvs = reader.read_tex_coords(0).map(|values| {
let mut uvs = Vec::new();
for value in values.into_f32() {
uvs.push(value[0]);
uvs.push(value[1]);
}
uvs
});
cpu_meshes.push(CPUMesh {
name: name.clone(),
positions,
normals,
tangents,
indices,
colors,
uvs,
material_name: Some(material_name),
});
}
}
}
for child in node.children() {
parse_tree(&child, loaded, path, buffers, cpu_meshes, cpu_materials)?;
}
Ok(())
}
fn parse_texture<'a>(
loaded: &mut Loaded,
path: &Path,
buffers: &[::gltf::buffer::Data],
gltf_texture: ::gltf::texture::Texture,
) -> ThreeDResult<CPUTexture<u8>> {
let gltf_image = gltf_texture.source();
let gltf_source = gltf_image.source();
let tex = match gltf_source {
::gltf::image::Source::Uri { uri, .. } => loaded.image(path.join(Path::new(uri)))?,
::gltf::image::Source::View { view, .. } => {
let mut bytes = Vec::with_capacity(view.length());
bytes.extend(
(0..view.length())
.map(|i| buffers[view.buffer().index()][view.offset() + i])
.into_iter(),
);
if view.stride() != None {
unimplemented!();
}
image_from_bytes(&bytes)?
}
};
Ok(tex)
}
