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{-# LANGUAGE ExistentialQuantification, DeriveDataTypeable #-}
module GLDriver ( Driver(..)
, SomeDriver(..)
, Event
, SomeEvent(..)
, fromEvent
, QuitEvent(..)
, Key(..)
, KeyPressEvent(..)
, KeyReleaseEvent(..)
, MouseMotionEvent(..)
, MousePressEvent(..)
) where
import Data.Typeable
class Driver a where
initialized :: a -> Bool
initGL :: a -> IO a
deinitGL :: a -> IO ()
swapBuffers :: a -> IO ()
nextEvent :: a -> IO (a, Maybe SomeEvent)
data SomeDriver = forall d. Driver d => SomeDriver d
instance Driver SomeDriver where
initialized (SomeDriver d) = initialized d
initGL (SomeDriver d) = initGL d >>= return . SomeDriver
deinitGL (SomeDriver d) = deinitGL d
swapBuffers (SomeDriver d) = swapBuffers d
nextEvent (SomeDriver d) = nextEvent d >>= \(gl, ev) -> return (SomeDriver gl, ev)
class (Typeable a, Show a) => Event a
data SomeEvent = forall a. Event a => SomeEvent a
instance Show SomeEvent where
show (SomeEvent a) = show a
fromEvent :: Event a => SomeEvent -> Maybe a
fromEvent (SomeEvent a) = cast a
data QuitEvent = QuitEvent deriving (Typeable, Show)
instance Event QuitEvent
data Key = KeyLeft | KeyRight | KeyUp | KeyDown
deriving (Eq, Ord, Show)
data KeyPressEvent = KeyPressEvent Key deriving (Typeable, Show)
instance Event KeyPressEvent
data KeyReleaseEvent = KeyReleaseEvent Key deriving (Typeable, Show)
instance Event KeyReleaseEvent
data MouseMotionEvent = MouseMotionEvent Float Float deriving (Typeable, Show)
instance Event MouseMotionEvent
data MousePressEvent = MousePressEvent Float Float deriving (Typeable, Show)
instance Event MousePressEvent
|
