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|
-----------------------------------------------------------------------------
-- |
-- Module : Graphics.UI.SDL.General
-- Copyright : (c) David Himmelstrup 2005
-- License : BSD-like
--
-- Maintainer : lemmih@gmail.com
-- Stability : provisional
-- Portability : portable
--
-- Various small functions which makes the binding process easier.
-----------------------------------------------------------------------------
module Graphics.UI.SDL.Utilities where
import Foreign (Bits((.|.), (.&.)))
import Foreign.C (CInt)
import Prelude hiding (Enum(..))
class Enum a b | a -> b where
succ :: a -> a
pred :: a -> a
toEnum :: b -> a
fromEnum :: a -> b
enumFromTo :: a -> a -> [a]
intToBool :: Int -> IO Int -> IO Bool
intToBool err action
= fmap (err/=) action
toBitmask :: (Enum a b,Bits b) => [a] -> b
toBitmask = foldr (.|.) 0 . map fromEnum
fromBitmask :: (Bounded a,Enum a b,Bits b) => b -> [a]
fromBitmask mask = foldr worker [] lst
where lst = enumFromTo minBound maxBound
worker v
= if (mask .&. fromEnum v) /= 0
then (:) v
else id
{-
toBitmaskW :: (UnsignedEnum a) => [a] -> Word32
toBitmaskW = foldr (.|.) 0 . map fromEnumW
fromBitmaskW :: (Bounded a,UnsignedEnum a) => Word32 -> [a]
fromBitmaskW mask = foldr worker [] lst
where lst = enumFromToW minBound maxBound
worker v
= if (mask .&. fromEnumW v) /= 0
then (:) v
else id
-}
fromCInt :: Num a => CInt -> a
fromCInt = fromIntegral
toCInt :: Int -> CInt
toCInt = fromIntegral
|
