> and
            <em class="parameter"><code>draw</code></em> or
            <em class="parameter"><code>read</code></em>
            are not set to
            <code class="constant">EGL_NO_SURFACE</code>, or if
            <em class="parameter"><code>draw</code></em> or
            <em class="parameter"><code>read</code></em> are set to
            <code class="constant">EGL_NO_SURFACE</code> and
            <em class="parameter"><code>context</code></em> is not set to
            <code class="constant">