function scr_maskdraw_start(arg0, arg1, arg2, arg3)
{
    gpu_set_blendenable(false);
    gpu_set_colorwriteenable(false, false, false, true);
    draw_set_alpha(0);
    ossafe_fill_rectangle(arg0, arg1, arg2, arg3);
    draw_set_alpha(1);
}