break;case"WEBGL_compressed_texture_pvrtc":d=a.getExtension("WEBGL_compressed_texture_pvrtc")||a.getExtension("WEBKIT_WEBGL_compressed_texture_pvrtc");break;default:d=a.getExtension(c)}null===d&&console.log("THREE.WebGLRenderer: "+c+" extension not supported.");returnb[c]=d}};