remove redundant function definition in GLTFLoader (#25316)

examples/jsm/loaders/GLTFLoader.js

@@ -62,6 +62,7 @@ import {
 	VectorKeyframeTrack,
 	sRGBEncoding
 } from 'three';
+import { toTrianglesDrawMode } from '../utils/BufferGeometryUtils.js';
 
 class GLTFLoader extends Loader {
 
@@ -4307,98 +4308,4 @@ function addPrimitiveAttributes( geometry, primitiveDef, parser ) {
 
 }
 
-/**
- * @param {BufferGeometry} geometry
- * @param {Number} drawMode
- * @return {BufferGeometry}
- */
-function toTrianglesDrawMode( geometry, drawMode ) {
-
-	let index = geometry.getIndex();
-
-	// generate index if not present
-
-	if ( index === null ) {
-
-		const indices = [];
-
-		const position = geometry.getAttribute( 'position' );
-
-		if ( position !== undefined ) {
-
-			for ( let i = 0; i < position.count; i ++ ) {
-
-				indices.push( i );
-
-			}
-
-			geometry.setIndex( indices );
-			index = geometry.getIndex();
-
-		} else {
-
-			console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Undefined position attribute. Processing not possible.' );
-			return geometry;
-
-		}
-
-	}
-
-	//
-
-	const numberOfTriangles = index.count - 2;
-	const newIndices = [];
-
-	if ( drawMode === TriangleFanDrawMode ) {
-
-		// gl.TRIANGLE_FAN
-
-		for ( let i = 1; i <= numberOfTriangles; i ++ ) {
-
-			newIndices.push( index.getX( 0 ) );
-			newIndices.push( index.getX( i ) );
-			newIndices.push( index.getX( i + 1 ) );
-
-		}
-
-	} else {
-
-		// gl.TRIANGLE_STRIP
-
-		for ( let i = 0; i < numberOfTriangles; i ++ ) {
-
-			if ( i % 2 === 0 ) {
-
-				newIndices.push( index.getX( i ) );
-				newIndices.push( index.getX( i + 1 ) );
-				newIndices.push( index.getX( i + 2 ) );
-
-
-			} else {
-
-				newIndices.push( index.getX( i + 2 ) );
-				newIndices.push( index.getX( i + 1 ) );
-				newIndices.push( index.getX( i ) );
-
-			}
-
-		}
-
-	}
-
-	if ( ( newIndices.length / 3 ) !== numberOfTriangles ) {
-
-		console.error( 'THREE.GLTFLoader.toTrianglesDrawMode(): Unable to generate correct amount of triangles.' );
-
-	}
-
-	// build final geometry
-
-	const newGeometry = geometry.clone();
-	newGeometry.setIndex( newIndices );
-
-	return newGeometry;
-
-}
-
 export { GLTFLoader };