/usr/lib/hugs/packages/GLUT/Graphics/UI/GLUT/Extensions.hs is in libhugs-glut-bundled 98.200609.21-5.3.
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-- |
-- Module : Graphics.UI.GLUT.Extensions
-- Copyright : (c) Sven Panne 2002-2005
-- License : BSD-style (see the file libraries/OpenGL/LICENSE)
--
-- Maintainer : sven.panne@aedion.de
-- Stability : provisional
-- Portability : portable
--
-- This is a purely internal module for handling an OpenGL-like extension
-- mechanism for GLUT.
--
--------------------------------------------------------------------------------
module Graphics.UI.GLUT.Extensions (
FunPtr, unsafePerformIO,
Invoker, getProcAddress, getProcAddressInternal -- used only internally
) where
import Foreign.C.String ( CString, withCString )
import Foreign.Ptr ( FunPtr, nullFunPtr )
import System.IO.Unsafe ( unsafePerformIO )
--------------------------------------------------------------------------------
type Invoker a = FunPtr a -> a
getProcAddress :: String -> String -> IO (FunPtr a)
getProcAddress ext call =
throwIfNull ("unknown GLUT call " ++ call ++ ", check for " ++ ext) $
getProcAddressInternal call
throwIfNull :: String -> IO (FunPtr a) -> IO (FunPtr a)
throwIfNull msg act = do
res <- act
if res == nullFunPtr
then ioError (userError msg)
else return res
getProcAddressInternal :: String -> IO (FunPtr a)
getProcAddressInternal call = withCString call hs_GLUT_getProcAddress
foreign import ccall unsafe "hs_GLUT_getProcAddress" hs_GLUT_getProcAddress
:: CString -> IO (FunPtr a)
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