HA</code>,
                    <code class="constant">GLU_ALPHA4</code>,
                    <code class="constant">GLU_ALPHA8</code>,
                    <code class="constant">GLU_ALPHA12</code>,
                    <code class="constant">GLU_ALPHA16</code>,
                    <code class="constant">GLU_LUMINANCE</code>,
                    <code class="constant">GLU_LUMINANCE4</code>,
                    <code class="constant">GLU_LUMINANCE8</code>,
                    <code class="constant">GLU_LUMINAN