struct ConfigThing
{
    ConfigThingType type;
    union {
        struct {
            int major, minor;
            int red_bits, green_bits, blue_bits, alpha_bits;
            int depth_bits, stencil_bits;
        } GL;
        struct {
            BarlayDecorateFlag or_whatever;
        } Window;
    }
}

void barclay_window_config(ConfigThing *configs, int len)