From e1c196b90ebf3a3d35f560b1ea23b87afc114695 Mon Sep 17 00:00:00 2001
From: Garrett Johnson <garrett.kjohnson@gmail.com>
Date: Fri, 20 Dec 2024 12:17:13 +0900
Subject: [PATCH] GLTFExtensionPlugin: Add support for meshoptDecoder

---
 src/plugins/README.md                     | 3 ++-
 src/plugins/three/GLTFExtensionsPlugin.js | 8 ++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/plugins/README.md b/src/plugins/README.md
index d9e18efed..4c5ec6a13 100644
--- a/src/plugins/README.md
+++ b/src/plugins/README.md
@@ -491,9 +491,10 @@ Available options are as follows:
 	// A list of other extensions to include in the loader. All elements are passed to the "GLTFLoader.register" function.
 	plugins: [],
 
-	// DRACOLoader and KTX2Loader instances to add to the loader.
+	// DRACOLoader, KTX2Loader, and MeshoptDecoder instances to add to the loader.
 	dracoLoader: null,
 	ktxLoader: null,
+	meshoptDecoder: null,
 
 	// Whether to automatically dispose of the DRACO and KTX Loaders when the plugin is disposed.
 	autoDispose: true,
diff --git a/src/plugins/three/GLTFExtensionsPlugin.js b/src/plugins/three/GLTFExtensionsPlugin.js
index fb93b6f7d..8813e259b 100644
--- a/src/plugins/three/GLTFExtensionsPlugin.js
+++ b/src/plugins/three/GLTFExtensionsPlugin.js
@@ -15,6 +15,7 @@ export class GLTFExtensionsPlugin {
 
 			dracoLoader: null,
 			ktxLoader: null,
+			meshoptDecoder: null,
 			autoDispose: true,
 			...options,
 		};
@@ -27,6 +28,7 @@ export class GLTFExtensionsPlugin {
 
 		this.dracoLoader = options.dracoLoader;
 		this.ktxLoader = options.ktxLoader;
+		this.meshoptDecoder = options.meshoptDecoder;
 		this._gltfRegex = /\.(gltf|glb)$/g;
 		this._dracoRegex = /\.drc$/g;
 		this._loader = null;
@@ -49,6 +51,12 @@ export class GLTFExtensionsPlugin {
 
 		}
 
+		if ( this.meshoptDecoder ) {
+
+			loader.setMeshoptDecoder( this.meshoptDecoder );
+
+		}
+
 		if ( this.rtc ) {
 
 			loader.register( () => new GLTFCesiumRTCExtension() );