type target =
    [ `color_4
    | `index
    | `normal
    | `texture_coord_1
    | `texture_coord_2
    | `texture_coord_3
    | `texture_coord_4
    | `vertex_3
    | `vertex_4 ]
val map1 :
  target:target -> float * float -> order:int -> [ `double ] Raw.t -> unit
val map2 :
  target:target ->
  float * float ->
  order:int -> float * float -> order:int -> [ `double ] Raw.t -> unit
val eval_coord1 : float -> unit
val eval_coord2 : float -> float -> unit
val grid1 : n:int -> range:float * float -> unit
val grid2 :
  n1:int -> range1:float * float -> n2:int -> range2:float * float -> unit
val eval_mesh1 : mode:[ `line | `point ] -> range:int * int -> unit
val eval_mesh2 :
  mode:[ `fill | `line | `point ] ->
  range1:int * int -> range2:int * int -> unit
val eval_point1 : int -> unit
val eval_point2 : int -> int -> unit