export declare class CompressedTextureLoader {
    /**
     * Loads ETC1 texture in PKM container.
     *
     * @param url URL to texture PKM file.
     * @param gl WebGL context.
     */
    static loadETC1(url: string, gl: WebGLRenderingContext | WebGL2RenderingContext): Promise<WebGLTexture | null>;
}