Preparation for the external dependencies package

packages/dev/core/src/Materials/Textures/Loaders/ktxTextureLoader.ts

@@ -127,7 +127,7 @@ export class _KTXTextureLoader implements IInternalTextureLoader {
             );
         } else if (KhronosTextureContainer2.IsValid(data)) {
             const ktx2 = new KhronosTextureContainer2(texture.getEngine());
-            ktx2.uploadAsync(data, texture, options).then(
+            ktx2._uploadAsync(data, texture, options).then(
                 () => {
                     callback(texture.width, texture.height, texture.generateMipMaps, true, () => {}, false);
                 },

packages/dev/core/src/Meshes/Compression/dracoCompressionWorker.ts

@@ -0,0 +1,256 @@
+import type { Nullable } from "core/types";
+import type { DecoderModule, DecoderBuffer, Decoder, Mesh, PointCloud, Status } from "draco3dgltf";
+import { DracoDecoderModule } from "draco3dgltf";
+
+// eslint-disable-next-line @typescript-eslint/naming-convention
+declare let DracoDecoderModule: DracoDecoderModule;
+
+export interface AttributeData {
+    kind: string;
+    data: ArrayBufferView;
+    size: number;
+    byteOffset: number;
+    byteStride: number;
+    normalized: boolean;
+}
+
+interface InitDoneMessage {
+    id: "initDone";
+}
+
+interface DecodeMeshDoneMessage {
+    id: "decodeMeshDone";
+    totalVertices: number;
+}
+
+interface IndicesMessage {
+    id: "indices";
+    data: Uint16Array | Uint32Array;
+}
+
+interface AttributeMessage extends AttributeData {
+    id: "attribute";
+}
+export type Message = InitDoneMessage | DecodeMeshDoneMessage | IndicesMessage | AttributeMessage;
+// WorkerGlobalScope
+declare function importScripts(...urls: string[]): void;
+declare function postMessage(message: Message, transfer?: any[]): void;
+
+/**
+ * @internal
+ */
+export function decodeMesh(
+    decoderModule: DecoderModule,
+    data: Int8Array,
+    attributes: { [kind: string]: number } | undefined,
+    onIndicesData: (indices: Uint16Array | Uint32Array) => void,
+    onAttributeData: (kind: string, data: ArrayBufferView, size: number, offset: number, stride: number, normalized: boolean) => void
+): number {
+    let decoder: Nullable<Decoder> = null;
+    let buffer: Nullable<DecoderBuffer> = null;
+    let geometry: Nullable<Mesh | PointCloud> = null;
+
+    try {
+        decoder = new decoderModule.Decoder();
+
+        buffer = new decoderModule.DecoderBuffer();
+        buffer.Init(data, data.byteLength);
+
+        let status: Status;
+        const type = decoder.GetEncodedGeometryType(buffer);
+        switch (type) {
+            case decoderModule.TRIANGULAR_MESH: {
+                const mesh = new decoderModule.Mesh();
+                status = decoder.DecodeBufferToMesh(buffer, mesh);
+                if (!status.ok() || mesh.ptr === 0) {
+                    throw new Error(status.error_msg());
+                }
+
+                const numFaces = mesh.num_faces();
+                const numIndices = numFaces * 3;
+                const byteLength = numIndices * 4;
+
+                const ptr = decoderModule._malloc(byteLength);
+                try {
+                    decoder.GetTrianglesUInt32Array(mesh, byteLength, ptr);
+                    const indices = new Uint32Array(numIndices);
+                    indices.set(new Uint32Array(decoderModule.HEAPF32.buffer, ptr, numIndices));
+                    onIndicesData(indices);
+                } finally {
+                    decoderModule._free(ptr);
+                }
+
+                geometry = mesh;
+                break;
+            }
+            case decoderModule.POINT_CLOUD: {
+                const pointCloud = new decoderModule.PointCloud();
+                status = decoder.DecodeBufferToPointCloud(buffer, pointCloud);
+                if (!status.ok() || !pointCloud.ptr) {
+                    throw new Error(status.error_msg());
+                }
+
+                geometry = pointCloud;
+                break;
+            }
+            default: {
+                throw new Error(`Invalid geometry type ${type}`);
+            }
+        }
+
+        const numPoints = geometry.num_points();
+
+        const processAttribute = (decoder: Decoder, geometry: Mesh | PointCloud, kind: string, attribute: any) => {
+            const dataType = attribute.data_type();
+            const numComponents = attribute.num_components();
+            const normalized = attribute.normalized();
+            const byteStride = attribute.byte_stride();
+            const byteOffset = attribute.byte_offset();
+
+            const dataTypeInfo = {
+                [decoderModule.DT_FLOAT32]: { typedArrayConstructor: Float32Array, heap: decoderModule.HEAPF32 },
+                [decoderModule.DT_INT8]: { typedArrayConstructor: Int8Array, heap: decoderModule.HEAP8 },
+                [decoderModule.DT_INT16]: { typedArrayConstructor: Int16Array, heap: decoderModule.HEAP16 },
+                [decoderModule.DT_INT32]: { typedArrayConstructor: Int32Array, heap: decoderModule.HEAP32 },
+                [decoderModule.DT_UINT8]: { typedArrayConstructor: Uint8Array, heap: decoderModule.HEAPU8 },
+                [decoderModule.DT_UINT16]: { typedArrayConstructor: Uint16Array, heap: decoderModule.HEAPU16 },
+                [decoderModule.DT_UINT32]: { typedArrayConstructor: Uint32Array, heap: decoderModule.HEAPU32 },
+            };
+
+            const info = dataTypeInfo[dataType];
+            if (!info) {
+                throw new Error(`Invalid data type ${dataType}`);
+            }
+
+            const numValues = numPoints * numComponents;
+            const byteLength = numValues * info.typedArrayConstructor.BYTES_PER_ELEMENT;
+
+            const ptr = decoderModule._malloc(byteLength);
+            try {
+                decoder.GetAttributeDataArrayForAllPoints(geometry, attribute, dataType, byteLength, ptr);
+                const data = new info.typedArrayConstructor(info.heap.buffer, ptr, numValues);
+                onAttributeData(kind, data.slice(), numComponents, byteOffset, byteStride, normalized);
+            } finally {
+                decoderModule._free(ptr);
+            }
+        };
+
+        if (attributes) {
+            for (const kind in attributes) {
+                const id = attributes[kind];
+                const attribute = decoder.GetAttributeByUniqueId(geometry, id);
+                processAttribute(decoder, geometry, kind, attribute);
+            }
+        } else {
+            const dracoAttributeTypes: { [kind: string]: number } = {
+                position: decoderModule.POSITION,
+                normal: decoderModule.NORMAL,
+                color: decoderModule.COLOR,
+                uv: decoderModule.TEX_COORD,
+            };
+
+            for (const kind in dracoAttributeTypes) {
+                const id = decoder.GetAttributeId(geometry, dracoAttributeTypes[kind]);
+                if (id !== -1) {
+                    const attribute = decoder.GetAttribute(geometry, id);
+                    processAttribute(decoder, geometry, kind, attribute);
+                }
+            }
+        }
+
+        return numPoints;
+    } finally {
+        if (geometry) {
+            decoderModule.destroy(geometry);
+        }
+
+        if (buffer) {
+            decoderModule.destroy(buffer);
+        }
+
+        if (decoder) {
+            decoderModule.destroy(decoder);
+        }
+    }
+}
+
+/**
+ * The worker function that gets converted to a blob url to pass into a worker.
+ * To be used if a developer wants to create their own worker instance and inject it instead of using the default worker.
+ */
+export function workerFunction(): void {
+    let decoderPromise: PromiseLike<any> | undefined;
+
+    onmessage = (event) => {
+        const message = event.data;
+        switch (message.id) {
+            case "init": {
+                const decoder = message.decoder;
+                // if URL is provided then load the script. Otherwise expect the script to be loaded already
+                if (decoder.url) {
+                    importScripts(decoder.url);
+                }
+                decoderPromise = DracoDecoderModule({ wasmBinary: decoder.wasmBinary });
+                postMessage({ id: "initDone" });
+                break;
+            }
+            case "decodeMesh": {
+                if (!decoderPromise) {
+                    throw new Error("Draco decoder module is not available");
+                }
+                decoderPromise.then((decoder) => {
+                    const numPoints = decodeMesh(
+                        decoder,
+                        message.dataView,
+                        message.attributes,
+                        (indices) => {
+                            postMessage({ id: "indices", data: indices }, [indices.buffer]);
+                        },
+                        (kind, data, size, offset, stride, normalized) => {
+                            postMessage({ id: "attribute", kind, data, size, byteOffset: offset, byteStride: stride, normalized }, [data.buffer]);
+                        }
+                    );
+                    postMessage({ id: "decodeMeshDone", totalVertices: numPoints });
+                });
+                break;
+            }
+        }
+    };
+}
+
+/**
+ * Initializes a worker that was created for the draco agent pool
+ * @param worker  The worker to initialize
+ * @param decoderWasmBinary The wasm binary to load into the worker
+ * @param moduleUrl The url to the draco decoder module (optional)
+ * @returns A promise that resolves when the worker is initialized
+ */
+export function initializeWebWorker(worker: Worker, decoderWasmBinary: ArrayBuffer, moduleUrl?: string): Promise<Worker> {
+    return new Promise<Worker>((resolve, reject) => {
+        const onError = (error: ErrorEvent) => {
+            worker.removeEventListener("error", onError);
+            worker.removeEventListener("message", onMessage);
+            reject(error);
+        };
+
+        const onMessage = (event: MessageEvent<Message>) => {
+            if (event.data.id === "initDone") {
+                worker.removeEventListener("error", onError);
+                worker.removeEventListener("message", onMessage);
+                resolve(worker);
+            }
+        };
+
+        worker.addEventListener("error", onError);
+        worker.addEventListener("message", onMessage);
+
+        worker.postMessage({
+            id: "init",
+            decoder: {
+                url: moduleUrl,
+                wasmBinary: decoderWasmBinary,
+            },
+        });
+        // note: no transfer list as the ArrayBuffer is shared across main thread and pool workers
+    });
+}