type ('a, 'b) t = ('a, 'b) GlPix.t
val create :
  ([< Gl.kind ] as 'a) ->
  format:([< Gl.format ] as 'b) -> width:int -> height:int -> ('b, 'a) t
val of_raw :
  ([< Gl.kind ] as 'a) Raw.t ->
  format:([< Gl.format ] as 'b) -> width:int -> height:int -> ('b, 'a) t
val to_raw : ('a, 'b) t -> 'b Raw.t
val format : ('a, 'b) t -> 'a
val width : ('a, 'b) t -> int
val height : ('a, 'b) t -> int
val raw_pos : ([< Gl.format ], [< Gl.kind ]) t -> x:int -> y:int -> int
val read :
  x:int ->
  y:int ->
  width:int ->
  height:int ->
  format:([< Gl.format ] as 'a) -> kind:([< Gl.kind ] as 'b) -> ('a, 'b) t
type bitmap = ([ `color_index ], [ `bitmap ]) t
val bitmap : bitmap -> orig:Gl.point2 -> move:Gl.point2 -> unit
val draw : ([< Gl.format ], [< Gl.kind ]) t -> unit
type map =
    [ `a_to_a
    | `b_to_b
    | `g_to_g
    | `i_to_a
    | `i_to_b
    | `i_to_g
    | `i_to_i
    | `i_to_r
    | `r_to_r
    | `s_to_s ]
val map : map -> [ `float ] Raw.t -> unit
type store_param =
    [ `pack_alignment of int
    | `pack_lsb_first of bool
    | `pack_row_length of int
    | `pack_skip_pixels of int
    | `pack_skip_rows of int
    | `pack_swap_bytes of bool
    | `unpack_alignment of int
    | `unpack_lsb_first of bool
    | `unpack_row_length of int
    | `unpack_skip_pixels of int
    | `unpack_skip_rows of int
    | `unpack_swap_bytes of bool ]
val store : store_param -> unit
type transfer_param =
    [ `alpha_bias of float
    | `alpha_scale of float
    | `blue_bias of float
    | `blue_scale of float
    | `depth_bias of float
    | `depth_scale of float
    | `green_bias of float
    | `green_scale of float
    | `index_offset of int
    | `index_shift of int
    | `map_color of bool
    | `map_stencil of bool
    | `red_bias of float
    | `red_scale of float ]
val transfer : transfer_param -> unit
val zoom : x:float -> y:float -> unit
val raster_pos : x:float -> y:float -> ?z:float -> ?w:float -> unit -> unit
val copy :
  x:int ->
  y:int ->
  width:int -> height:int -> buffer:[ `color | `depth | `stencil ] -> unit