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+{-# LANGUAGE ForeignFunctionInterface, DeriveDataTypeable, GeneralizedNewtypeDeriving #-}
+
+module Bindings.GLX ( createColormap
+                    , createWindow
+                    , chooseFBConfig
+                    , getVisualFromFBConfig
+                    , XVisualInfo(..)
+                    , XSetWindowAttributes(..)
+                    , nullSetWindowAttributes
+                    , glXGetVisualFromFBConfig
+                    , glxRenderType
+                    , glxRgbaBit
+                    , glxDrawableType
+                    , glxWindowBit
+                    , glxXRenderable
+                    , glxDoublebuffer
+                    , glxDepthSize
+                    , glxStencilSize
+                    , glxTrue
+                    , glXCreateContext
+                    , glXMakeCurrent
+                    , GLXContext(..)
+       		    ) where
+
+import Data.Generics
+import Data.Int
+import Data.Word
+
+import Foreign.C.Types
+import Foreign.Ptr
+import Foreign.Marshal.Alloc (alloca)
+import Foreign.Marshal.Array (peekArray, withArray0)
+import Foreign.Storable
+
+import Graphics.X11.Types (AttributeMask, Colormap, ColormapAlloc, Cursor, EventMask, Pixmap, Window, WindowClass, VisualID, XID)
+import Graphics.X11.Xlib.Extras (none)
+import Graphics.X11.Xlib.Types (Dimension, Display, Pixel, Position)
+
+
+#include <GL/glx.h>
+
+
+newtype GLXFBConfig = GLXFBConfig (Ptr GLXFBConfig)
+    deriving (Eq, Ord, Show, Typeable, Data, Storable)
+
+newtype GLXContext = GLXContext (Ptr GLXContext)
+    deriving (Eq, Ord, Show, Typeable, Data, Storable)
+
+newtype Visual = Visual (Ptr Visual)
+     deriving (Eq, Ord, Show, Typeable, Data, Storable)
+
+data XVisualInfo = XVisualInfo
+    { vi_visual        :: !Visual
+    , vi_visualid      :: !VisualID
+    , vi_screen        :: !CInt
+    , vi_depth         :: !CInt
+    , vi_class         :: !CInt
+    , vi_red_mask      :: !CULong
+    , vi_green_mask    :: !CULong
+    , vi_blue_mask     :: !CULong
+    , vi_colormap_size :: !CInt
+    , vi_bits_per_rgb  :: !CInt
+    } deriving (Eq, Ord, Show, Typeable)
+
+instance Storable XVisualInfo where
+    sizeOf _ = (#size XVisualInfo)
+    alignment _ = alignment (undefined :: CULong)
+    
+    peek vi = do
+      visual <- (#peek XVisualInfo, visual) vi
+      visualid <- (#peek XVisualInfo, visualid) vi
+      screen <- (#peek XVisualInfo, screen) vi
+      depth <- (#peek XVisualInfo, depth) vi
+      viclass <- (#peek XVisualInfo, class) vi
+      red_mask <- (#peek XVisualInfo, red_mask) vi
+      green_mask <- (#peek XVisualInfo, green_mask) vi
+      blue_mask <- (#peek XVisualInfo, blue_mask) vi
+      colormap_size <- (#peek XVisualInfo, colormap_size) vi
+      bits_per_rgb <- (#peek XVisualInfo, bits_per_rgb) vi
+      
+      return (XVisualInfo visual visualid screen depth viclass red_mask green_mask blue_mask colormap_size bits_per_rgb)
+      
+    
+    poke vi (XVisualInfo visual visualid screen depth viclass red_mask green_mask blue_mask colormap_size bits_per_rgb) = do
+                                (#poke XVisualInfo, visual) vi visual
+                                (#poke XVisualInfo, visualid) vi visualid
+                                (#poke XVisualInfo, screen) vi screen
+                                (#poke XVisualInfo, depth) vi depth
+                                (#poke XVisualInfo, class) vi viclass
+                                (#poke XVisualInfo, red_mask) vi red_mask
+                                (#poke XVisualInfo, green_mask) vi green_mask
+                                (#poke XVisualInfo, blue_mask) vi blue_mask
+                                (#poke XVisualInfo, colormap_size) vi colormap_size
+                                (#poke XVisualInfo, bits_per_rgb) vi bits_per_rgb
+
+
+data XSetWindowAttributes = XSetWindowAttributes
+    { swa_background_pixmap :: !Pixmap
+    , swa_packground_pixel  :: !Pixel
+    , swa_border_pixmap     :: !Pixmap
+    , swa_bit_gravity       :: !CInt
+    , swa_win_gravity       :: !CInt
+    , swa_backing_store     :: !CInt
+    , swa_backing_planes    :: !CULong
+    , swa_backing_pixel     :: !CULong
+    , swa_save_under        :: !Bool
+    , swa_event_mask        :: !EventMask
+    , swa_do_not_propagate_mask :: !CULong
+    , swa_override_redirect :: !Bool
+    , swa_colormap          :: !Colormap
+    , swa_cursor            :: !Cursor
+    } deriving (Eq, Ord, Show, Typeable)
+
+instance Storable XSetWindowAttributes where
+    sizeOf _ = (#size XSetWindowAttributes)
+    alignment _ = alignment (undefined :: CULong)
+    
+    peek swa = do
+      background_pixmap <- (#peek XSetWindowAttributes, background_pixmap) swa
+      background_pixel <- (#peek XSetWindowAttributes, background_pixel) swa
+      border_pixmap <- (#peek XSetWindowAttributes, border_pixmap) swa
+      bit_gravity <- (#peek XSetWindowAttributes, bit_gravity) swa
+      win_gravity <- (#peek XSetWindowAttributes, win_gravity) swa
+      backing_store <- (#peek XSetWindowAttributes, backing_store) swa
+      backing_planes <- (#peek XSetWindowAttributes, backing_planes) swa
+      backing_pixel <- (#peek XSetWindowAttributes, backing_pixel) swa
+      save_under <- (#peek XSetWindowAttributes, save_under) swa
+      event_mask <- (#peek XSetWindowAttributes, event_mask) swa
+      do_not_propagate_mask <- (#peek XSetWindowAttributes, do_not_propagate_mask) swa
+      override_redirect <- (#peek XSetWindowAttributes, override_redirect) swa
+      colormap <- (#peek XSetWindowAttributes, colormap) swa
+      cursor <- (#peek XSetWindowAttributes, cursor) swa
+      
+      return (XSetWindowAttributes
+              background_pixmap
+              background_pixel
+              border_pixmap
+              bit_gravity
+              win_gravity
+              backing_store
+              backing_planes
+              backing_pixel
+              save_under
+              event_mask
+              do_not_propagate_mask
+              override_redirect
+              colormap
+              cursor)
+
+    poke swa (XSetWindowAttributes
+              background_pixmap
+              background_pixel
+              border_pixmap
+              bit_gravity
+              win_gravity
+              backing_store
+              backing_planes
+              backing_pixel
+              save_under
+              event_mask
+              do_not_propagate_mask
+              override_redirect
+              colormap
+              cursor) = do
+      (#poke XSetWindowAttributes, background_pixmap) swa background_pixmap
+      (#poke XSetWindowAttributes, background_pixel) swa background_pixel
+      (#poke XSetWindowAttributes, border_pixmap) swa border_pixmap
+      (#poke XSetWindowAttributes, bit_gravity) swa bit_gravity
+      (#poke XSetWindowAttributes, win_gravity) swa win_gravity
+      (#poke XSetWindowAttributes, backing_store) swa backing_store
+      (#poke XSetWindowAttributes, backing_planes) swa backing_planes
+      (#poke XSetWindowAttributes, backing_pixel) swa backing_pixel
+      (#poke XSetWindowAttributes, save_under) swa save_under
+      (#poke XSetWindowAttributes, event_mask) swa event_mask
+      (#poke XSetWindowAttributes, do_not_propagate_mask) swa do_not_propagate_mask
+      (#poke XSetWindowAttributes, override_redirect) swa override_redirect
+      (#poke XSetWindowAttributes, colormap) swa colormap
+      (#poke XSetWindowAttributes, cursor) swa cursor
+
+nullSetWindowAttributes :: XSetWindowAttributes
+nullSetWindowAttributes = (XSetWindowAttributes 0 0 0 0 0 0 0 0 False 0 0 False 0 0)
+           
+
+foreign import ccall unsafe "GL/glx.h XCreateColormap"
+        createColormap :: Display -> Window -> Visual -> ColormapAlloc -> IO Colormap
+
+foreign import ccall unsafe "GL/glx.h XCreateWindow"
+        createWindow :: Display -> Window -> Position -> Position ->
+                        Dimension -> Dimension -> CInt -> CInt -> WindowClass ->
+                        Visual -> AttributeMask -> Ptr XSetWindowAttributes -> IO Window
+
+
+
+foreign import ccall unsafe "GL/glx.h glXChooseFBConfig"
+        glXChooseFBConfig :: Display -> CInt -> Ptr CInt -> Ptr CInt -> IO (Ptr GLXFBConfig)
+
+chooseFBConfig :: Display -> CInt -> [(CInt, CInt)] -> IO [GLXFBConfig]
+chooseFBConfig disp sc attr = alloca $ \n -> withArray0 (fromIntegral none) (concatMap (\(a,b) -> [a,b]) attr) $ \attrp -> do
+                                configs <- glXChooseFBConfig disp sc attrp n
+                                nelements <- peek n
+                                peekArray (fromIntegral nelements) configs
+
+glxRenderType :: CInt
+glxRenderType = (#const GLX_RENDER_TYPE)
+
+glxRgbaBit :: CInt
+glxRgbaBit = (#const GLX_RGBA_BIT)
+
+glxDrawableType :: CInt
+glxDrawableType = (#const GLX_DRAWABLE_TYPE)
+
+glxWindowBit :: CInt
+glxWindowBit = (#const GLX_WINDOW_BIT)
+
+glxXRenderable :: CInt
+glxXRenderable = (#const GLX_X_RENDERABLE)
+
+glxDoublebuffer :: CInt
+glxDoublebuffer = (#const GLX_DOUBLEBUFFER)
+
+glxDepthSize :: CInt
+glxDepthSize = (#const GLX_DEPTH_SIZE)
+
+glxStencilSize :: CInt
+glxStencilSize = (#const GLX_STENCIL_SIZE)
+
+glxTrue :: CInt
+glxTrue = (#const True)
+
+foreign import ccall unsafe "GL/glx.h glXGetVisualFromFBConfig"
+        glXGetVisualFromFBConfig :: Display -> GLXFBConfig -> IO (Ptr XVisualInfo)
+
+getVisualFromFBConfig :: Display -> GLXFBConfig -> IO (XVisualInfo)
+getVisualFromFBConfig disp config = do
+  vi <- glXGetVisualFromFBConfig disp config
+  peek vi
+
+foreign import ccall unsafe "GL/glx.h glXCreateContext"
+        glXCreateContext :: Display -> Ptr XVisualInfo -> GLXContext -> Bool -> IO GLXContext
+
+foreign import ccall unsafe "GL/glx.h glXMakeCurrent"
+        glXMakeCurrent :: Display -> XID -> GLXContext -> IO Bool