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use crate::{
    graph::{NodeDescriptor, SceneDescriptor},
    {LoadResult, Materials, Mesh3D, ObjectLoader, SceneError},
};
use rfw_backend::MeshId3D;
use rfw_math::*;
use rfw_utils::collections::TrackedStorage;
use std::collections::HashMap;
use std::path::PathBuf;

#[derive(Debug, Copy, Clone)]
pub struct GltfLoader {}

impl std::fmt::Display for GltfLoader {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "gltf-loader")
    }
}

impl Default for GltfLoader {
    fn default() -> Self {
        Self {}
    }
}

impl ObjectLoader for GltfLoader {
    fn load(
        &self,
        path: PathBuf,
        mat_manager: &mut Materials,
        mesh_storage: &mut TrackedStorage<Mesh3D>,
    ) -> Result<LoadResult, SceneError> {
        let loader = l3d::LoadInstance::new().with_default();
        let scene: l3d::load::SceneDescriptor = match loader.load(l3d::load::LoadOptions {
            source: l3d::load::LoadSource::Path(path.clone()),
            ..Default::default()
        }) {
            l3d::LoadResult::Mesh(_) => return Err(SceneError::LoadError(path)),
            l3d::LoadResult::Scene(s) => s,
            l3d::LoadResult::None(_) => return Err(SceneError::LoadError(path)),
        };

        let mut mat_indices: HashMap<u32, u32> = HashMap::new();
        let mut tex_maps: HashMap<u32, u32> = HashMap::new();

        let (materials, textures) = scene.materials.take();
        for (i, texture) in textures.into_iter().enumerate() {
            tex_maps.insert(i as u32, mat_manager.push_texture(texture) as u32);
        }
        for (i, mut mat) in materials.into_iter().enumerate() {
            // Update texture ids
            if mat.diffuse_tex >= 0 {
                mat.diffuse_tex = tex_maps[&(mat.diffuse_tex as u32)] as i16;
            }
            if mat.normal_tex >= 0 {
                mat.normal_tex = tex_maps[&(mat.normal_tex as u32)] as i16;
            }
            if mat.metallic_roughness_tex >= 0 {
                mat.metallic_roughness_tex = tex_maps[&(mat.metallic_roughness_tex as u32)] as i16;
            }
            if mat.emissive_tex >= 0 {
                mat.emissive_tex = tex_maps[&(mat.emissive_tex as u32)] as i16;
            }
            if mat.sheen_tex >= 0 {
                mat.sheen_tex = tex_maps[&(mat.sheen_tex as u32)] as i16;
            }

            mat_indices.insert(i as u32, mat_manager.push(mat) as u32);
        }

        let mut meshes = Vec::with_capacity(scene.meshes.len());

        for (_, mut mesh) in scene.meshes.into_iter().enumerate() {
            mesh.material_ids.iter_mut().for_each(|i| {
                *i = mat_indices[&(*i as u32)] as i32;
            });

            meshes.push(mesh_storage.push(Mesh3D::from(mesh)) as u32);
        }

        let mut node_descriptors = Vec::with_capacity(scene.nodes.len());
        node_descriptors.push(load_node(&meshes, &scene.nodes[0]));

        let meshes = meshes.iter().map(|i| MeshId3D::from(*i as usize)).collect();
        Ok(LoadResult::Scene(SceneDescriptor {
            meshes,
            nodes: node_descriptors,
            animations: scene.animations,
        }))
    }

    fn load_from_str(
        &self,
        _string: &str,
        _mat_manager: &mut Materials,
        _mesh_storage: &mut TrackedStorage<Mesh3D>
    )  -> Result<LoadResult, SceneError> {
        todo!()
    }
}

fn load_node(meshes: &Vec<u32>, node: &l3d::load::NodeDescriptor) -> NodeDescriptor {
    let mut node_meshes = vec![];
    for mesh in node.meshes.iter() {
        node_meshes.push(meshes[*mesh as usize]);
    }

    let mut child_nodes = vec![];
    if !node.child_nodes.is_empty() {
        child_nodes.reserve(node.child_nodes.len());
        for child in node.child_nodes.iter() {
            child_nodes.push(load_node(meshes, child));
        }
    }

    NodeDescriptor {
        name: node.name.clone(),
        child_nodes,

        translation: Vec3::from(node.translation),
        rotation: Quat::from_array(node.rotation),
        scale: Vec3::from(node.scale),

        meshes: node_meshes,
        skin: node.skin.clone(),
        weights: node.weights.clone(),

        id: node.id,
    }
}