# File lib/as_geometrybuffer.rb, line 64
  def add_geom_for_sprite(tex)
    raise "Buffer must be V2T2 format" unless @n_vert == 2 and @n_tex == 2 and @n_color == 0
    
    w, h = [tex.w, tex.h]
    tw, th = (tex.tex_target == GL::TEXTURE_RECTANGLE_EXT) ? [tex.w, tex.h] : [1, 1]
    
    return add_geom([
                     0,0,  0, 0,
                     w,0, tw, 0,
                     w,h, tw,th,
                     0,h,  0,th,
                    ])
  end