R</code>.
            If a call to <code class="function">glGetError</code> returns <code class="constant">GL_NO_ERROR</code>,
            there has been no detectable error since the last call to <code class="function">glGetError</code>,
            or since the GL was initialized.
        </p><p>
            To allow for distributed implementations,
            there may be several error flags.
            If any single error flag has recorded an error,
            the value of that flag is returned
     