 constant expressions. The array must be sized to include all
            clip planes that are enabled via the OpenGL API; if the size does not include all enabled planes,
            results are undefined. The size may be at most <code class="varname">gl_MaxClipDistances</code>. The number
            of varying components consumed by <code class="varname">gl_ClipDistance</code> will match the size of the
            array, no matter how many planes are enabled. The shader must also set all values in <code