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use std::borrow::Cow;
use std::collections::HashMap;
use std::fs::read_to_string;
use std::path::Path;
use ecs::Component;
use crate::asset::{Assets, Handle as AssetHandle, Submitter as AssetSubmitter};
use crate::material::Material;
use crate::mesh::Mesh;
use crate::texture::Texture;
#[derive(Debug, Clone, Component)]
#[non_exhaustive]
pub struct Model
{
pub asset_handle: AssetHandle<Data>,
}
impl Model
{
pub fn new(asset_handle: AssetHandle<Data>) -> Self
{
Self { asset_handle }
}
}
#[derive(Debug, Default, Clone)]
#[non_exhaustive]
pub struct Data
{
pub mesh: Mesh,
pub materials: HashMap<String, Material>,
}
impl Data
{
pub fn builder() -> DataBuilder
{
DataBuilder::default()
}
}
#[derive(Debug, Default, Clone)]
pub struct DataBuilder
{
mesh: Mesh,
materials: HashMap<String, Material>,
}
impl DataBuilder
{
pub fn mesh(mut self, mesh: Mesh) -> Self
{
self.mesh = mesh;
self
}
pub fn material<'name>(
mut self,
name: impl Into<Cow<'name, str>>,
material: Material,
) -> Self
{
self.materials.insert(name.into().into_owned(), material);
self
}
pub fn build(self) -> Data
{
Data {
mesh: self.mesh,
materials: self.materials,
}
}
}
#[derive(Debug, Clone)]
#[non_exhaustive]
pub struct Settings {}
#[derive(Debug, thiserror::Error)]
enum Error
{
#[error("Failed to read model file")]
ReadModelFileFailed(#[source] std::io::Error),
#[error("Failed to read material file")]
ReadMaterialFileFailed(#[source] std::io::Error),
#[error("Failed to parse model file")]
ParsingFailed(#[from] ParsingError),
}
pub fn set_asset_importers(assets: &mut Assets)
{
assets.set_importer(["obj"], import_wavefront_obj_asset);
}
#[derive(Debug, thiserror::Error)]
enum ParsingError
{
#[error(transparent)]
Obj(#[from] crate::file_format::wavefront::obj::Error),
#[error(transparent)]
Mtl(#[from] crate::file_format::wavefront::mtl::Error),
}
fn import_wavefront_obj_asset(
asset_submitter: &mut AssetSubmitter<'_>,
path: &Path,
_settings: Option<&'_ Settings>,
) -> Result<(), Error>
{
let obj = crate::file_format::wavefront::obj::parse(
&read_to_string(path).map_err(Error::ReadModelFileFailed)?,
)
.map_err(|err| Error::ParsingFailed(ParsingError::Obj(err)))?;
let mesh = obj
.to_mesh()
.map_err(|err| Error::ParsingFailed(ParsingError::Obj(err)))?;
let mut materials =
HashMap::<String, Material>::with_capacity(obj.mtl_libs.iter().flatten().count());
for mtl_lib_path in obj.mtl_libs.iter().flatten() {
materials.extend(import_mtl(asset_submitter, &mtl_lib_path)?);
}
asset_submitter.submit_store(Data { mesh, materials });
Ok(())
}
fn import_mtl<'a>(
asset_submitter: &'a AssetSubmitter<'_>,
path: &Path,
) -> Result<impl Iterator<Item = (String, Material)> + 'a, Error>
{
let named_materials = crate::file_format::wavefront::mtl::parse(
&read_to_string(path).map_err(Error::ReadMaterialFileFailed)?,
)
.map_err(|err| Error::ParsingFailed(ParsingError::Mtl(err)))?;
Ok(named_materials.into_iter().map(|named_material| {
let mut material_builder = Material::builder()
.ambient(named_material.ambient)
.diffuse(named_material.diffuse)
.specular(named_material.specular)
.shininess(named_material.shininess);
if let Some(ambient_map) = named_material.ambient_map {
material_builder = material_builder.ambient_map(Texture::new(
asset_submitter.submit_load_other(ambient_map.path.as_path()),
));
}
if let Some(diffuse_map) = named_material.diffuse_map {
material_builder = material_builder.diffuse_map(Texture::new(
asset_submitter.submit_load_other(diffuse_map.path.as_path()),
));
}
if let Some(specular_map) = named_material.specular_map {
material_builder = material_builder.specular_map(Texture::new(
asset_submitter.submit_load_other(specular_map.path.as_path()),
));
}
(named_material.name, material_builder.build())
}))
}
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