he compressed texture by calling <a class="citerefentry" href="glGetTexLevelParameter"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a> with
            argument <code class="constant">GL_TEXTURE_COMPRESSED_IMAGE_SIZE</code>.  Finally, retrieve the
            internal format of the texture by calling <a class="citerefentry" href="glGetTexLevelParameter"><span class="citerefentry"><span class="refentrytitle">glGetTexLevelParameter</span></span></a> with
       