@loaders.gl/3d-tiles/dist/lib/encoders/encode-3d-tile-composite.js

3D Tiles, an open standard for streaming massive heterogeneous 3D geospatial datasets.

// loaders.gl
// SPDX-License-Identifier: MIT AND Apache-2.0
// Copyright vis.gl contributors
// This file is derived from the Cesium code base under Apache 2 license
// See LICENSE.md and https://github.com/AnalyticalGraphicsInc/cesium/blob/master/LICENSE.md
import { MAGIC_ARRAY } from "../constants.js";
import { encode3DTileHeader, encode3DTileByteLength } from "./helpers/encode-3d-tile-header.js";
export function encodeComposite3DTile(tile, dataView, byteOffset, options, encode3DTile) {
    // Add default magic for this tile type
    tile = { magic: MAGIC_ARRAY.COMPOSITE, tiles: [], ...tile };
    const byteOffsetStart = byteOffset;
    byteOffset += encode3DTileHeader(tile, dataView, byteOffset);
    if (dataView) {
        dataView.setUint32(byteOffset, tile.tiles.length, true); // tilesLength
    }
    byteOffset += 4;
    for (let i = 0; i < tile.tiles.length; ++i) {
        byteOffset += encode3DTile(tile.tiles[i], dataView, byteOffset, options);
    }
    // Go "back" and rewrite the tile's `byteLength` now that we know the value
    encode3DTileByteLength(dataView, byteOffsetStart, byteOffset - byteOffsetStart);
    return byteOffset;
}
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