texture
        unit, specified with
        <a class="citerefentry" href="glActiveTexture"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>.
        </p></div><div class="refsect1" title="Errors"><a id="errors"></a><h2>Errors</h2><p><code class="constant">GL_INVALID_ENUM</code> is generated if
        <em class="parameter"><code>target</code></em> is not
        <code class="constant">GL_TEXTURE_2D</code>.</p><p><code class="constant">GL_INVALID_VALUE</code> may be g