@babylonjs/loaders
Version:
For usage documentation please visit https://doc.babylonjs.com/features/featuresDeepDive/importers/loadingFileTypes/.
51 lines • 2.2 kB
JavaScript
import { ArrayItem, GLTFLoader } from "../glTFLoader.js";
import { MeshoptCompression } from "@babylonjs/core/Meshes/Compression/meshoptCompression.js";
import { registerGLTFExtension, unregisterGLTFExtension } from "../glTFLoaderExtensionRegistry.js";
const NAME = "EXT_meshopt_compression";
/**
* [Specification](https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Vendor/EXT_meshopt_compression/README.md)
*
* This extension uses a WebAssembly decoder module from https://github.com/zeux/meshoptimizer/tree/master/js
* @since 5.0.0
*/
// eslint-disable-next-line @typescript-eslint/naming-convention
export class EXT_meshopt_compression {
/**
* @internal
*/
constructor(loader) {
/**
* The name of this extension.
*/
this.name = NAME;
this.enabled = loader.isExtensionUsed(NAME);
this._loader = loader;
}
/** @internal */
dispose() {
this._loader = null;
}
/**
* @internal
*/
// eslint-disable-next-line no-restricted-syntax
loadBufferViewAsync(context, bufferView) {
return GLTFLoader.LoadExtensionAsync(context, bufferView, this.name, async (extensionContext, extension) => {
const bufferViewMeshopt = bufferView;
if (bufferViewMeshopt._meshOptData) {
return await bufferViewMeshopt._meshOptData;
}
const buffer = ArrayItem.Get(`${context}/buffer`, this._loader.gltf.buffers, extension.buffer);
bufferViewMeshopt._meshOptData = this._loader
.loadBufferAsync(`/buffers/${buffer.index}`, buffer, extension.byteOffset || 0, extension.byteLength)
// eslint-disable-next-line github/no-then
.then(async (buffer) => {
return await MeshoptCompression.Default.decodeGltfBufferAsync(buffer, extension.count, extension.byteStride, extension.mode, extension.filter);
});
return await bufferViewMeshopt._meshOptData;
});
}
}
unregisterGLTFExtension(NAME);
registerGLTFExtension(NAME, true, (loader) => new EXT_meshopt_compression(loader));
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