code>,
                    <code class="constant">GLU_LUMINANCE16_ALPHA16</code>,
                    <code class="constant">GLU_INTENSITY</code>,
                    <code class="constant">GLU_INTENSITY4</code>,
                    <code class="constant">GLU_INTENSITY8</code>,
                    <code class="constant">GLU_INTENSITY12</code>,
                    <code class="constant">GLU_INTENSITY16</code>,
                    <code class="constant">GLU_RGB</code>,
                    <code class="constan