
        debug(`Testing depth stencil texture modes with ${format.name}`);
        const fbo = gl.createFramebuffer();
        gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);

        const rbo = gl.createRenderbuffer();
        gl.bindRenderbuffer(gl.RENDERBUFFER, rbo);
        gl.renderbufferStorage(gl.RENDERBUFFER, gl.RGBA8, 1, 1);
        gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, rbo);

        const tex = gl.createTexture();
        gl.bindTexture(gl.TEXTURE_2D, tex);
 