R_PolygonVertex('0 0 0', tc_00, rgb, a);
R_PolygonVertex(autocvar_vid_conwidth * '1 0 0', tc_10, rgb, a);
R_PolygonVertex(autocvar_vid_conwidth * '1 0 0' + autocvar_vid_conheight * '0 1 0', tc_11, rgb, a);
R_PolygonVertex('0 0 0', tc_00, rgb, a);
R_PolygonVertex(autocvar_vid_conwidth * '1 0 0', tc_10, rgb, a);
R_PolygonVertex(autocvar_vid_conwidth * '1 0 0' + autocvar_vid_conheight * '0 1 0', tc_11, rgb, a);