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use std::fs::read_to_string;
use std::path::{Path, PathBuf};
use ecs::util::Either;
use crate::asset::{Assets, Label as AssetLabel, Submitter as AssetSubmitter};
use crate::material::Material;
use crate::model::{MaterialDescription, Spec};
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Settings
{
/// Whether all UVs should be flipped on the Y axis. This is necessary if the UVs
/// have their origin at the bottom left corner of the image
///
/// The default is `true`.
pub y_flip_uvs: bool,
}
impl Settings
{
/// Whether all UVs should be flipped on the Y axis. This is necessary if the UVs have
/// their origin at the bottom left corner of the image
///
/// The default is `true`.
#[must_use]
pub fn y_flip_uvs(mut self, y_flip_uvs: bool) -> Self
{
self.y_flip_uvs = y_flip_uvs;
self
}
}
impl Default for Settings
{
fn default() -> Self
{
Self { y_flip_uvs: true }
}
}
pub fn add_importers(assets: &mut Assets)
{
assets.set_importer::<Spec, Settings, Error>(import);
}
fn import(
asset_submitter: &mut AssetSubmitter<'_>,
path: &Path,
settings: Option<&Settings>,
) -> Result<(), Error>
{
if path.extension().is_none_or(|ext| ext != "obj") {
return Err(Error::UnsupportedFileType);
}
let settings = match settings {
Some(settings) => settings,
None => &Settings::default(),
};
let parent_path = path
.parent()
.ok_or_else(|| Error::InvalidPath(path.to_path_buf()))?;
let obj = crate::file_format::wavefront::obj::parse(
&read_to_string(path)
.map_err(|err| Error::ReadFailed(err, path.to_path_buf()))?,
)?;
let mesh = obj.to_mesh(
crate::file_format::wavefront::obj::ToMeshOptions::default()
.y_flip_uvs(settings.y_flip_uvs),
)?;
let mesh_asset = asset_submitter.submit_store_named("mesh", mesh);
if obj.mtl_libs.len() > 1 {
return Err(Error::MoreThanOneMaterialLibrary);
}
asset_submitter.submit_store(
Spec::builder()
.mesh(mesh_asset)
.materials(if obj.mtl_libs.is_empty() {
Either::A([].into_iter())
} else {
Either::B(
obj.unique_used_material_names
.iter()
.zip(std::iter::repeat(obj.mtl_libs.iter()).flatten())
.map(|(material_name, mtl_lib)| {
MaterialDescription::new(
asset_submitter.submit_load_other::<Material>(
AssetLabel {
path: parent_path.join(mtl_lib).into(),
name: Some(material_name.as_ref().into()),
},
),
)
}),
)
})
.build(),
);
Ok(())
}
#[derive(Debug, thiserror::Error)]
enum Error
{
#[error("File type is unsupported")]
UnsupportedFileType,
#[error("Invalid path '{}'", .0.display())]
InvalidPath(PathBuf),
#[error("Failed to read file {}", .1.display())]
ReadFailed(#[source] std::io::Error, PathBuf),
#[error("More than one material library is specified. This is not supported")]
MoreThanOneMaterialLibrary,
#[error(transparent)]
Other(#[from] crate::file_format::wavefront::obj::Error),
}
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