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-- #hide
--------------------------------------------------------------------------------
-- |
-- Module : Graphics.UI.GLUT.QueryUtils
-- Copyright : (c) Sven Panne 2002-2005
-- License : BSD-style (see the file libraries/GLUT/LICENSE)
--
-- Maintainer : sven.panne@aedion.de
-- Stability : stable
-- Portability : portable
--
-- This is a purely internal module with utilities to query GLUT state.
--
--------------------------------------------------------------------------------
module Graphics.UI.GLUT.QueryUtils (
Getter, simpleGet, layerGet, deviceGet, glutSetOption
) where
import Foreign.C.Types ( CInt )
import Graphics.Rendering.OpenGL.GL.BasicTypes ( GLenum )
import Graphics.UI.GLUT.Extensions
--------------------------------------------------------------------------------
#include "HsGLUTExt.h"
--------------------------------------------------------------------------------
type PrimGetter = GLenum -> IO CInt
type Getter a = (CInt -> a) -> GLenum -> IO a
makeGetter :: PrimGetter -> Getter a
makeGetter g f = fmap f . g
simpleGet, layerGet, deviceGet :: Getter a
simpleGet = makeGetter glutGet
layerGet = makeGetter glutLayerGet
deviceGet = makeGetter glutDeviceGet
foreign import CALLCONV unsafe "glutGet" glutGet :: PrimGetter
foreign import CALLCONV unsafe "glutLayerGet" glutLayerGet :: PrimGetter
foreign import CALLCONV unsafe "glutDeviceGet" glutDeviceGet :: PrimGetter
-- Not really a query function, but it's quite handy to have it here
EXTENSION_ENTRY(unsafe,"freeglut",glutSetOption,GLenum -> CInt -> IO ())
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