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The GlFunc module

val accum : op:[`accum|`add|`load|`mult|`return] -> float -> unit

val alpha_func : Gl.cmp_func -> ref:Gl.clampf -> unit
type sfactor =
  [`dst_alpha|`dst_color|`one|`one_minus_dst_alpha|`one_minus_dst_color
  |`one_minus_src_alpha|`src_alpha|`src_alpha_saturate|`zero]
type dfactor =
  [`dst_alpha|`one|`one_minus_dst_alpha|`one_minus_src_alpha
  |`one_minus_src_color|`src_alpha|`src_color|`zero]

val blend_func : src:sfactor -> dst:dfactor -> unit

val color_mask :
  ?red:bool -> ?green:bool -> ?blue:bool -> ?alpha:bool -> unit -> unit

val depth_func : Gl.cmp_func -> unit

val depth_mask : bool -> unit

val depth_range : near:float -> far:float -> unit

val index_mask : int -> unit

val stencil_func : Gl.cmp_func -> ref:int -> mask:int -> unit

val stencil_mask : int -> unit
type stencil_op = [`decr|`incr|`invert|`keep|`replace|`zero]

val stencil_op :
  ?fail:stencil_op -> ?zfail:stencil_op -> ?zpass:stencil_op -> unit -> unit
type logic_op =
  [`And|`Or|`and_inverted|`and_reverse|`clear|`copy|`copy_inverted|`equiv
  |`invert|`nand|`noop|`nor|`or_inverted|`or_reverse|`set|`xor]

val logic_op : logic_op -> unit
type draw_buffer =
  [`aux of int|`back|`back_left|`back_right|`front|`front_and_back|`front_left
  |`front_right|`left|`none|`right]

val draw_buffer : draw_buffer -> unit
type read_buffer =
  [`aux of int|`back|`back_left|`back_right|`front|`front_left|`front_right
  |`left|`right]
val read_buffer : read_buffer -> unit


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