// import type {Geometry} from './geometry';
export function unpackIndexedGeometry(geometry) {
    const { indices, attributes } = geometry;
    if (!indices) {
        return geometry;
    }
    const vertexCount = indices.value.length;
    const unpackedAttributes = {};
    for (const attributeName in attributes) {
        const attribute = attributes[attributeName];
        const { constant, value, size } = attribute;
        if (constant || !size) {
            continue; // eslint-disable-line
        }
        const unpackedValue = new value.constructor(vertexCount * size);
        for (let x = 0; x < vertexCount; ++x) {
            const index = indices.value[x];
            for (let i = 0; i < size; i++) {
                unpackedValue[x * size + i] = value[index * size + i];
            }
        }
        unpackedAttributes[attributeName] = { size, value: unpackedValue };
    }
    return {
        attributes: Object.assign({}, attributes, unpackedAttributes)
    };
}
// export function calculateVertexNormals(positions: Float32Array): Uint8Array {
//   let normals = new Uint8Array(positions.length / 3);
//   for (let i = 0; i < positions.length; i++) {
//     const vec1 = new Vector3(positions.subarray(i * 3, i + 0, i + 3));
//     const vec2 = new Vector3(positions.subarray(i + 3, i + 6));
//     const vec3 = new Vector3(positions.subarray(i + 6, i + 9));
//     const normal = new Vector3(vec1).cross(vec2).normalize();
//     normals.set(normal[0], i + 4);
//     normals.set(normal[1], i + 4 + 1);
//     normals.set(normal[2], i + 2);
//   }
//   const normal = new Vector3(vec1).cross(vec2).normalize();
// }