mesh.rs

use bevy_mesh::PrimitiveTopology;

use gltf::{
    mesh::{Mesh, Mode},
    Material,
};

use crate::GltfError;

pub(crate) fn primitive_name(mesh: &Mesh<'_>, material: &Material) -> String {
    let mesh_name = mesh.name().unwrap_or("Mesh");

    if let Some(material_name) = material.name() {
        format!("{mesh_name}.{material_name}")
    } else {
        mesh_name.to_string()
    }
}

/// Maps the `primitive_topology` from glTF to `wgpu`.
#[cfg_attr(
    not(target_arch = "wasm32"),
    expect(
        clippy::result_large_err,
        reason = "`GltfError` is only barely past the threshold for large errors."
    )
)]
pub(crate) fn primitive_topology(mode: Mode) -> Result<PrimitiveTopology, GltfError> {
    match mode {
        Mode::Points => Ok(PrimitiveTopology::PointList),
        Mode::Lines => Ok(PrimitiveTopology::LineList),
        Mode::LineStrip => Ok(PrimitiveTopology::LineStrip),
        Mode::Triangles => Ok(PrimitiveTopology::TriangleList),
        Mode::TriangleStrip => Ok(PrimitiveTopology::TriangleStrip),
        mode => Err(GltfError::UnsupportedPrimitive { mode }),
    }
}