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module GLX ( glxDriver
) where
import GLDriver
import Bindings.GLX
import Control.Monad (when, unless)
import Data.Bits ((.|.))
import Data.Maybe (isJust)
import Graphics.Rendering.OpenGL.GL (($=), GLdouble, Capability(..))
import Graphics.Rendering.OpenGL.GL.CoordTrans (matrixMode, MatrixMode(..), viewport, Position(..), Size(..), loadIdentity, ortho)
import Graphics.X11.Types
import Graphics.X11.Xlib.Atom (internAtom)
import Graphics.X11.Xlib.Display (defaultScreen, openDisplay, rootWindow)
import Graphics.X11.Xlib.Event (XEventPtr, allocaXEvent, nextEvent, get_Window, get_EventType, pending)
import Graphics.X11.Xlib.Extras (ClassHint(..), getEvent, ev_event_type, ev_width, ev_height, ev_keycode, ev_data)
import Graphics.X11.Xlib.Misc (keycodeToKeysym, setWMProtocols)
import Graphics.X11.Xlib.Types
import Graphics.X11.Xlib.Window (destroyWindow, mapWindow, storeName)
import Foreign.Marshal.Utils (with)
import Foreign.Ptr
import Foreign.Storable
data GLX = GLX
{ glxDisplay :: !Display
, glxWindow :: !Window
, glxContext :: !Context
, glxDeleteWindow :: !Atom
, glxScale :: !GLdouble
}
glxDriver :: GLX
glxDriver = GLX
{ glxDisplay = Display nullPtr
, glxWindow = 0
, glxContext = Context nullPtr
, glxDeleteWindow = 0
, glxScale = 1
}
instance Driver GLX where
initialized glx = ((glxContext glx) /= (Context nullPtr))
initGL glx = do
when (initialized glx) $ fail "GLX already initialized"
disp <- openDisplay ""
delwnd <- internAtom disp "WM_DELETE_WINDOW" False
fbconfigs <- chooseFBConfig disp (fromIntegral . defaultScreen $ disp)
[ (renderType, rgbaBit)
, (drawableType, windowBit)
, (doublebuffer, 1)
, (xRenderable, 1)
, (depthSize, 1)
, (stencilSize, 1)
]
visualinfo <- getVisualFromFBConfig disp (head fbconfigs)
rootwindow <- rootWindow disp (fromIntegral $ viScreen visualinfo)
cmap <- createColormap disp rootwindow (viVisual visualinfo) allocNone
let swa = nullSetWindowAttributes {swaColormap = cmap, swaEventMask = structureNotifyMask .|. keyPressMask .|. keyReleaseMask .|. pointerMotionMask}
wnd <- with swa $ \swaptr ->
createWindow disp rootwindow 0 0 800 600 0 (fromIntegral $ viDepth visualinfo) inputOutput (viVisual visualinfo) (cWBorderPixel.|.cWColormap.|.cWEventMask) swaptr
setClassHint disp wnd (ClassHint "HTanks" "htanks")
setWMProtocols disp wnd [delwnd]
storeName disp wnd "HTanks"
mapWindow disp wnd
waitForMapNotify disp wnd
ctx <- with visualinfo $ \vi -> createContext disp vi (Context nullPtr) True
makeCurrent disp wnd ctx
resize 800 600
return GLX
{ glxDisplay = disp
, glxWindow = wnd
, glxContext = ctx
, glxDeleteWindow = delwnd
, glxScale = 1
}
deinitGL glx = do
destroyWindow (glxDisplay glx) (glxWindow glx)
destroyContext (glxDisplay glx) (glxContext glx)
swapBuffers glx = Bindings.GLX.swapBuffers (glxDisplay glx) (glxWindow glx)
nextEvent glx = allocaXEvent $ nextEvent' glx
nextEvent' :: GLX -> XEventPtr -> IO (Maybe SomeEvent)
nextEvent' glx xevent = do
p <- pending $ glxDisplay glx
if (p > 0) then do
Graphics.X11.Xlib.Event.nextEvent (glxDisplay glx) xevent
ev <- handleEvent glx xevent
if isJust ev then
return ev
else
nextEvent' glx xevent
else
return Nothing
handleEvent :: GLX -> XEventPtr -> IO (Maybe SomeEvent)
handleEvent glx xevent = do
event <- getEvent xevent
let evtype = ev_event_type event
case () of
_ | evtype == configureNotify -> do
resize (fromIntegral . ev_width $ event) (fromIntegral . ev_height $ event)
return Nothing
| evtype == keyPress -> do
keysym <- keycodeToKeysym (glxDisplay glx) (ev_keycode event) 0
case () of
_ | keysym == xK_Escape -> return $ Just $ SomeEvent QuitEvent
| keysym == xK_Up -> return $ Just $ SomeEvent $ KeyPressEvent KeyUp
| keysym == xK_Down -> return $ Just $ SomeEvent $ KeyPressEvent KeyDown
| keysym == xK_Left -> return $ Just $ SomeEvent $ KeyPressEvent KeyLeft
| keysym == xK_Right -> return $ Just $ SomeEvent $ KeyPressEvent KeyRight
| otherwise -> return Nothing
| evtype == keyRelease -> do
keysym <- keycodeToKeysym (glxDisplay glx) (ev_keycode event) 0
case () of
_ | keysym == xK_Up -> return $ Just $ SomeEvent $ KeyReleaseEvent KeyUp
| keysym == xK_Down -> return $ Just $ SomeEvent $ KeyReleaseEvent KeyDown
| keysym == xK_Left -> return $ Just $ SomeEvent $ KeyReleaseEvent KeyLeft
| keysym == xK_Right -> return $ Just $ SomeEvent $ KeyReleaseEvent KeyRight
| otherwise -> return Nothing
| evtype == clientMessage -> do
if ((glxDeleteWindow glx) == (fromIntegral . head . ev_data $ event))
then
return $ Just $ SomeEvent QuitEvent
else
return Nothing
| otherwise -> return Nothing
resize :: Int -> Int -> IO ()
resize w h = do
let aspect = (fromIntegral w)/(fromIntegral h)
s = max (5/aspect) 5 :: GLdouble
matrixMode $= Projection
loadIdentity
ortho (-s*aspect) (s*aspect) (-s) s (-1) 1
matrixMode $= Modelview 0
viewport $= ((Position 0 0), (Size (fromIntegral w) (fromIntegral h)))
waitForMapNotify :: Display -> Window -> IO ()
waitForMapNotify disp wnd = allocaXEvent waitForMapNotify'
where
waitForMapNotify' event = do
Graphics.X11.Xlib.Event.nextEvent disp event
window <- get_Window event
eventType <- get_EventType event
unless (window == wnd && eventType == mapNotify) $
waitForMapNotify' event
|
