if (!init)
    init = true;
if (instance_exists(obj_mainchara))
{
    if (specialdepth != -4)
        depth = specialdepth;
    else
        depth = 999990;
    y = ystart;
}
else if (floortex != -4)
{
    y = floortex.bbox_top + y_plat_offset;
    depth = floortex.depth - 1;
}