    -- #hide
    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.Rendering.OpenGL.GL.PointParameter
    -- Copyright   :  (c) Sven Panne 2002-2009
    -- 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 setting point parameters.
    --
    --------------------------------------------------------------------------------

    module Graphics.Rendering.OpenGL.GL.PointParameter (
       PointParameter(..), pointParameterf, pointParameterfv
    ) where

    import Foreign.Ptr
    import Graphics.Rendering.OpenGL.Raw.ARB.Compatibility (
     gl_POINT_DISTANCE_ATTENUATION, gl_POINT_SIZE_MAX, gl_POINT_SIZE_MIN )
    import Graphics.Rendering.OpenGL.Raw.Core31

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

    data PointParameter =
         PointSizeMin
       | PointSizeMax
       | PointFadeThresholdSize
       | PointDistanceAttenuation

    marshalPointParameter :: PointParameter -> GLenum
    marshalPointParameter x = case x of
       PointSizeMin -> gl_POINT_SIZE_MIN
       PointSizeMax -> gl_POINT_SIZE_MAX
       PointFadeThresholdSize -> gl_POINT_FADE_THRESHOLD_SIZE
       PointDistanceAttenuation -> gl_POINT_DISTANCE_ATTENUATION

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

    pointParameterf :: PointParameter -> GLfloat -> IO ()
    pointParameterf = glPointParameterf . marshalPointParameter

    pointParameterfv :: PointParameter -> Ptr GLfloat -> IO ()
    pointParameterfv = glPointParameterfv . marshalPointParameter