    -- #hide
    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Sound.OpenAL.AL.PeekPoke
    -- Copyright   :  (c) Sven Panne 2003-2005
    -- License     :  BSD-style (see the file libraries/OpenGL/LICENSE)
    --
    -- Maintainer  :  sven.panne@aedion.de
    -- Stability   :  provisional
    -- Portability :  portable
    --
    -- This is a purely internal module with peek- and poke-related utilities.
    --
    --------------------------------------------------------------------------------

    module Sound.OpenAL.AL.PeekPoke (
       poke1, peek1, peek3, peek6
    ) where

    import Foreign.Ptr ( Ptr )
    import Foreign.Storable ( Storable(peekElemOff,pokeElemOff) )

    --------------------------------------------------------------------------------
    -- The implementation is little bit verbose/redundant, but seems to generate
    -- better code than mapM/zipWithM_.

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

    {-# INLINE poke1 #-}
    poke1 :: Storable a => Ptr a -> a -> IO ()
    poke1 ptr x =
       pokeElemOff ptr 0 x

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

    {-# INLINE peek1 #-}
    peek1 :: Storable a => (a -> b) -> Ptr a -> IO b
    peek1 f ptr = do
       x <- peekElemOff ptr 0
       return $ f x

    {-# INLINE peek3 #-}
    peek3 :: Storable a => (a -> a -> a -> b) -> Ptr a -> IO b
    peek3 f ptr = do
       x <- peekElemOff ptr 0
       y <- peekElemOff ptr 1
       z <- peekElemOff ptr 2
       return $ f x y z

    {-# INLINE peek6 #-}
    peek6 :: Storable a => (a -> a -> a -> b) -> Ptr a -> IO (b, b)
    peek6 f ptr = do
       x <- peekElemOff ptr 0
       y <- peekElemOff ptr 1
       z <- peekElemOff ptr 2
       u <- peekElemOff ptr 3
       v <- peekElemOff ptr 4
       w <- peekElemOff ptr 5
       return $ (f x y z, f u v w)