t><dd><p>
                    Specifies the symbolic name of the parameter to be set.
                    Six values affect the packing of pixel data into memory:
                    <code class="constant">GL_PACK_SWAP_BYTES</code>,
                    <code class="constant">GL_PACK_LSB_FIRST</code>,
                    <code class="constant">GL_PACK_ROW_LENGTH</code>,
                    <code class="constant">GL_PACK_IMAGE_HEIGHT</code>,
                    <code class="constant">GL_PACK_SKIP_PIXELS</code