    -- #hide
    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.Rendering.OpenGL.GL.PixelRectangles.Sink
    -- Copyright   :  (c) Sven Panne 2002-2006
    -- License     :  BSD-style (see the file libraries/OpenGL/LICENSE)
    --
    -- Maintainer  :  sven.panne@aedion.de
    -- Stability   :  stable
    -- Portability :  portable
    --
    -- This is a purely internal module for (un-)marshaling Sink.
    --
    --------------------------------------------------------------------------------

    module Graphics.Rendering.OpenGL.GL.PixelRectangles.Sink (
       Sink(..), marshalSink, unmarshalSink
    ) where

    import Graphics.Rendering.OpenGL.GL.BasicTypes ( GLboolean, GLint )
    import Graphics.Rendering.OpenGL.GL.GLboolean (
       marshalGLboolean, unmarshalGLboolean )

    --------------------------------------------------------------------------------

    data Sink =
         PassThrough
       | Sink
       deriving ( Eq, Ord, Show )

    marshalSink :: Sink -> GLboolean
    marshalSink x = marshalGLboolean (x == Sink)

    unmarshalSink :: GLint -> Sink
    unmarshalSink s = if unmarshalGLboolean s then Sink else PassThrough