@loaders.gl/gltf
Version:
Framework-independent loader for the glTF format
36 lines (35 loc) • 1.82 kB
JavaScript
// GLTF 1.0 EXTENSION: KHR_binary_glTF
// https://github.com/KhronosGroup/glTF/tree/master/extensions/1.0/Khronos/KHR_binary_glTF
/* eslint-disable camelcase */
import { GLTFScenegraph } from "../api/gltf-scenegraph.js";
const KHR_BINARY_GLTF = 'KHR_binary_glTF';
/** Extension name */
export const name = KHR_BINARY_GLTF;
export function preprocess(gltfData) {
const gltfScenegraph = new GLTFScenegraph(gltfData);
const { json } = gltfScenegraph;
// Note: json.buffers.binary_glTF also needs to be replaced
// This is currently done during gltf normalization
// Image and shader nodes can have the extension
// https://github.com/KhronosGroup/glTF/blob/master/extensions/1.0/Khronos/KHR_binary_glTF/schema/image.KHR_binary_glTF.schema.json
for (const image of json.images || []) {
const extension = gltfScenegraph.getObjectExtension(image, KHR_BINARY_GLTF);
// The data in the extension is valid as glTF 2.0 data inside the object, so just copy it in
if (extension) {
Object.assign(image, extension);
}
gltfScenegraph.removeObjectExtension(image, KHR_BINARY_GLTF);
}
// TODO shaders - At least traverse and throw error if used?
// https://github.com/KhronosGroup/glTF/blob/master/extensions/1.0/Khronos/KHR_binary_glTF/schema/shader.KHR_binary_glTF.schema.json
// glTF v1 one files have a partially formed URI field that is not expected in (and causes problems in) 2.0
if (json.buffers && json.buffers[0]) {
delete json.buffers[0].uri;
}
// Remove the top-level extension as it has now been processed
gltfScenegraph.removeExtension(KHR_BINARY_GLTF);
}
// KHR_binary_gltf is a 1.0 extension that is supported natively by 2.0
// export function encode() {
// throw new Error(KHR_BINARY_GLTF);
// }