 internal format, but new components cannot be added. For example,
        an <code class="constant">GL_RGB</code> color buffer can be used to create
        <code class="constant">GL_LUMINANCE</code> or <code class="constant">GL_RGB</code>
        textures, but not <code class="constant">GL_ALPHA</code>,
        <code class="constant">GL_LUMINANCE_ALPHA</code> or <code class="constant">GL_RGBA</code>
        textures.</p><p>Pixel ordering is such that lower <em class="parameter"><code>x</code></em>
       