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|
-- | This module has no public functions, but provides the surface interface
-- between the Montis runtime and the world.
module Montis.Core.Internal.Foreign.Export () where
import Control.Monad (forM_)
import Control.Monad.State (MonadIO (liftIO), gets)
import Data.ByteString qualified as BS
import Data.ByteString.Char8 qualified as CH
import Data.Singletons.Decide (Void)
import Foreign
( Ptr,
Storable (poke, pokeByteOff),
Word32,
Word8,
deRefStablePtr,
freeStablePtr,
mallocBytes,
newStablePtr,
)
import Foreign.C (CChar, CDouble (..), CInt (..))
import Foreign.Ptr (castPtr)
import Montis.Base.Foreign.WlRoots.Types
( ForeignSurface (toSurface),
ForeignWlrInputDevice,
ForeignWlrPointer,
ForeignWlrXWaylandSurface,
ForeignWlrXdgSurface,
WlrEventKeyboardKey,
WlrInputDevice (WlrInputDevice),
WlrPointer (WlrPointer),
WlrPointerButtonEvent,
)
import Montis.Core
import Montis.Core.State
import Montis.Core.State.Marshal (marshalState)
import Montis.Foreign.Marshal (Demarshal (Demarshal), demarshal, runDemarshal)
-- | Helpers to unpack the opaque state, run a Montis action, and re-wrap it.
-- Each call consumes the old stable pointer and returns a fresh one.
runForeign ::
Montis () ->
OpqStT ->
IO OpqStT
runForeign fn stableptr = do
(ctx, st) <- deRefStablePtr stableptr
freeStablePtr stableptr
(_, state') <- runMontis ctx st fn
newStablePtr (ctx, state')
runForeignWithReturn ::
(Storable a) =>
Montis a ->
Ptr a ->
OpqStT ->
IO OpqStT
runForeignWithReturn fn outptr stableptr = do
(ctx, st) <- deRefStablePtr stableptr
freeStablePtr stableptr
(val, state') <- runMontis ctx st fn
poke outptr val
newStablePtr (ctx, state')
-- ----------------------------------------------------------------------
-- State marshal/export
-- | Marshals the opaque state to a C-style byte array and size pointer.
foreign export ccall "arkworld_export_preserve"
worldMarshalState :: OpqStT -> Ptr Word32 -> IO (Ptr Word8)
worldMarshalState :: OpqStT -> Ptr Word32 -> IO (Ptr Word8)
worldMarshalState opqStT outlen = do
(_, st) <- deRefStablePtr opqStT
let bs = CH.pack (marshalState st)
ret <- mallocBytes (BS.length bs)
poke outlen (fromIntegral $ BS.length bs)
forM_ (zip [0 ..] (BS.unpack bs)) $ \(off, w8) -> do
pokeByteOff ret off w8
return ret
-- ----------------------------------------------------------------------
-- Input handlers
foreign export ccall "arkworld_export_handle_button"
worldHandleButton :: Ptr WlrPointerButtonEvent -> Word32 -> OpqStT -> IO OpqStT
worldHandleButton :: Ptr WlrPointerButtonEvent -> Word32 -> OpqStT -> IO OpqStT
worldHandleButton eventPtr modifiers =
runForeign $ do
s <- gets currentHooks
event <- liftIO $
runDemarshal eventPtr $ do
-- Follows struct wlr_pointer_button_event field order.
pointerPtr <- demarshal :: Demarshal (Ptr ForeignWlrPointer)
tMs <- demarshal
button <- demarshal
state <- demarshal :: Demarshal Word8
return $
ButtonEvent
(WlrPointer pointerPtr)
tMs
button
modifiers
(if state == (0 :: Word8) then ButtonReleased else ButtonPressed)
buttonHook s event
-- ----------------------------------------------------------------------
-- Keybinding handler
foreign export ccall "arkworld_export_handle_keybinding"
worldHandleKeybinding ::
Ptr ForeignWlrInputDevice ->
Ptr WlrEventKeyboardKey ->
Word32 ->
Word32 ->
Word32 ->
Ptr CInt ->
OpqStT ->
IO OpqStT
worldHandleKeybinding ::
Ptr ForeignWlrInputDevice ->
Ptr WlrEventKeyboardKey ->
Word32 ->
Word32 ->
Word32 ->
Ptr CInt ->
OpqStT ->
IO OpqStT
worldHandleKeybinding inputDevicePtr eventPtr mods sym cp =
runForeignWithReturn $ do
s <- gets currentHooks
event <- liftIO $
runDemarshal eventPtr $ do
-- Matches struct wlr_keyboard_key_event in wlroots.
tMs <- demarshal
kc <- demarshal
_ <- (demarshal :: Demarshal Word32)
keyState <- demarshal
return $
KeyEvent
tMs
kc
(if keyState == (0 :: Word8) then KeyReleased else KeyPressed)
mods
sym
(toEnum $ fromIntegral cp)
(WlrInputDevice inputDevicePtr)
keyHook s event
return 1
-- ----------------------------------------------------------------------
-- Motion handler
foreign export ccall "arkworld_export_handle_motion"
worldHandleMotion :: Ptr Void -> Word32 -> Word32 -> CDouble -> CDouble -> OpqStT -> IO OpqStT
worldHandleMotion :: Ptr Void -> Word32 -> Word32 -> CDouble -> CDouble -> OpqStT -> IO OpqStT
worldHandleMotion eventPtr modifiers isAbsolute lx ly =
runForeign $ do
s <- gets currentHooks
event <- liftIO $
if isAbsolute == 0
then
runDemarshal (castPtr eventPtr) $ do
pointerPtr <- demarshal :: Demarshal (Ptr ForeignWlrPointer)
tMs <- demarshal
_ <- demarshal :: Demarshal Word32
_ <- demarshal :: Demarshal Double
_ <- demarshal :: Demarshal Double
_ <- demarshal :: Demarshal Double
_ <- demarshal :: Demarshal Double
return $
MotionEvent
(WlrPointer pointerPtr)
tMs
modifiers
(realToFrac lx, realToFrac ly)
(0, 0)
else
runDemarshal (castPtr eventPtr) $ do
-- After time_msec, wlroots pads to 8-byte alignment for doubles.
pointerPtr <- demarshal :: Demarshal (Ptr ForeignWlrPointer)
tMs <- demarshal
_ <- demarshal :: Demarshal Word32
rawX <- demarshal
rawY <- demarshal
return $
MotionEvent
(WlrPointer pointerPtr)
tMs
modifiers
(realToFrac lx, realToFrac ly)
(rawX, rawY)
motionHook s event
-- ----------------------------------------------------------------------
-- Surface handlers
-- | Function exported to the harness to handle the mapping/unmapping/deletion
-- of an XDG surface.
foreign export ccall "arkworld_export_handle_surface"
worldHandleSurface ::
Ptr ForeignWlrXdgSurface -> CInt -> OpqStT -> IO OpqStT
worldHandleSurface ::
Ptr ForeignWlrXdgSurface -> CInt -> OpqStT -> IO OpqStT
worldHandleSurface p t =
runForeign $ do
s <- gets currentHooks
surfaceHook s (SurfaceEvent (toEnum $ fromIntegral t) (toSurface p))
-- | Function exported to the harness to handle the mapping/unmapping/deletion
-- of an XWayland surface.
foreign export ccall "arkworld_export_handle_xwayland_surface"
worldHandleXWaylandSurface ::
Ptr ForeignWlrXWaylandSurface -> CInt -> OpqStT -> IO OpqStT
worldHandleXWaylandSurface ::
Ptr ForeignWlrXWaylandSurface -> CInt -> OpqStT -> IO OpqStT
worldHandleXWaylandSurface p t =
runForeign $ do
s <- gets currentHooks
surfaceHook s (SurfaceEvent (toEnum $ fromIntegral t) (toSurface p))
|
