static constexpr default_font_size = 48;

struct s_ui_options
{
    int font_id = MY_FONT_0;
    int font_size = default_font_size;
    s_vec4 color;
};


static bool ui_button(s_v2 pos, s_ui_options options = {})
{
    int font_size;
    if(options.font_size != default_font_size)
    {
        font_size = options.font_size;
    }
    else
    {
        font_size = // get last pushed font size
    }
}