Add meshopt support to glTF utility classes

package.json

@@ -36,6 +36,7 @@
     "draco3dgltf": "^1.5.6",
     "gltf-pipeline": "^4.1.0",
     "gltfpack": "^0.19.1",
+    "meshoptimizer": "^0.19.0",
     "minimist": "^1.2.7",
     "node-stream-zip": "^1.15.0",
     "pino": "^8.15.0",

specs/contentProcessing/GltfTransformSpec.ts

@@ -0,0 +1,24 @@
+import fs from "fs";
+
+import { GltfTransform } from "../../src/contentProcessing/GltfTransform";
+
+describe("GltfTransform::getIO", function () {
+  it("can read a GLB without compression", async function () {
+    const glb = fs.readFileSync("./specs/data/gltf/Box.glb");
+    const io = await GltfTransform.getIO();
+    const document = await io.readBinary(glb);
+    expect(document).toBeDefined();
+  });
+  it("can read a GLB with Draco compression", async function () {
+    const glb = fs.readFileSync("./specs/data/gltf/BoxDraco.glb");
+    const io = await GltfTransform.getIO();
+    const document = await io.readBinary(glb);
+    expect(document).toBeDefined();
+  });
+  it("can read a GLB with meshopt compression", async function () {
+    const glb = fs.readFileSync("./specs/data/gltf/BoxMeshopt.glb");
+    const io = await GltfTransform.getIO();
+    const document = await io.readBinary(glb);
+    expect(document).toBeDefined();
+  });
+});

specs/data/gltf/README.md

@@ -0,0 +1,7 @@
+The "Box" glTF sample model, for testing the functionality 
+of reading GLB data with compression extensions.
+
+- Box.glb is the model from https://github.com/KhronosGroup/glTF-Sample-Models/blob/4ca06672ce15d6a27bfb5cf14459bc52fd9044d1/2.0/Box/
+- BoxDraco.glb is the same model with Draco compression
+- BoxMeshopt is the same model with meshopt compression
+

src/contentProcessing/GltfTransform.ts

@@ -1,7 +1,11 @@
 import draco3d from "draco3d";
 
+import { MeshoptDecoder } from "meshoptimizer";
+import { MeshoptEncoder } from "meshoptimizer";
+
 import { Transform } from "@gltf-transform/core";
 import { NodeIO } from "@gltf-transform/core";
+
 import { ALL_EXTENSIONS } from "@gltf-transform/extensions";
 
 import { EXTStructuralMetadata } from "../gltfExtensions/EXTStructuralMetadata";
@@ -26,7 +30,8 @@ export class GltfTransform {
    *
    * (E.g. it will be configured to handle the all extensions that
    * are known in glTF-Transform, as well as EXT_mesh_features and
-   * EXT_structural_metadata, and have a draco encoder/decoder)
+   * EXT_structural_metadata, and have draco- and meshopt
+   * encoders/decoders)
    *
    * @returns - The `NodeIO` instance
    */
@@ -38,6 +43,8 @@ export class GltfTransform {
     io.registerExtensions(ALL_EXTENSIONS).registerDependencies({
       "draco3d.decoder": await draco3d.createDecoderModule(),
       "draco3d.encoder": await draco3d.createEncoderModule(),
+      "meshopt.decoder": MeshoptDecoder,
+      "meshopt.encoder": MeshoptEncoder,
     });
     // Note: The order of these calls matters. The EXTMeshFeatures and
     // EXTInstanceFeatures depend on the EXTStructuralMetadata, because