    -- #hide
    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.Rendering.OpenGL.GL.PointParameter
    -- 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 setting point parameters.
    --
    --------------------------------------------------------------------------------

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

    import Foreign.Ptr ( Ptr )
    import Graphics.Rendering.OpenGL.GL.BasicTypes ( GLenum, GLfloat )
    import Graphics.Rendering.OpenGL.GL.Extensions (
       FunPtr, unsafePerformIO, Invoker, getProcAddress )

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

    #include "HsOpenGLExt.h"

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

    data PointParameter =
         PointSizeMin
       | PointSizeMax
       | PointFadeThresholdSize
       | PointDistanceAttenuation

    marshalPointParameter :: PointParameter -> GLenum
    marshalPointParameter x = case x of
       PointSizeMin -> 0x8126
       PointSizeMax -> 0x8127
       PointFadeThresholdSize -> 0x8128
       PointDistanceAttenuation -> 0x8129

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

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

    EXTENSION_ENTRY("GL_ARB_point_parameters or OpenGL 1.4",glPointParameterfARB,GLenum -> GLfloat -> IO ())

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

    EXTENSION_ENTRY("GL_ARB_point_parameters or OpenGL 1.4",glPointParameterfvARB,GLenum -> Ptr GLfloat -> IO ())