parameter"><code>read</code></em> surfaces. <em class="parameter"><code>draw</code></em>
            is used for all GL operations except for any pixel data read back
            (<a class="citerefentry" href="glReadPixels.html"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>,
            <a class="citerefentry" href="glCopyTexImage2D.html"><span class="citerefentry"><span class="refentrytitle">glCopyTexImage2D</span></span></a>, and
            <a class="citerefentry" 