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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 Data.Ratio
import Graphics.Rendering.OpenGL.GL (($=), GLdouble, GLfloat, Vector3(..), Capability(..))
import Graphics.Rendering.OpenGL.GL.CoordTrans (matrixMode, MatrixMode(..), viewport, Position(..), Size(..), loadIdentity, ortho, translate, scale, rotate, frustum)
import Graphics.X11.Types
import Graphics.X11.Xlib.Atom (internAtom)
import Graphics.X11.Xlib.Color (queryColor)
import Graphics.X11.Xlib.Display (defaultScreen, openDisplay, rootWindow, whitePixel)
import Graphics.X11.Xlib.Event (XEventPtr, allocaXEvent, nextEvent, get_Window, get_EventType, pending, sync)
import Graphics.X11.Xlib.Extras (ClassHint(..), getEvent, ev_event_type, ev_width, ev_height, ev_keycode, ev_data, ev_x, ev_y, getWindowAttributes, wa_width, wa_height)
import Graphics.X11.Xlib.Misc (keycodeToKeysym, setWMProtocols, createPixmap, createPixmapCursor, defineCursor)
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 :: !Rational
, glxLevelWidth :: !Int
, glxLevelHeight :: !Int
}
glxDriver :: Int -> Int -> GLX
glxDriver w h = GLX
{ glxDisplay = Display nullPtr
, glxWindow = 0
, glxContext = Context nullPtr
, glxDeleteWindow = 0
, glxScale = 1
, glxLevelWidth = w
, glxLevelHeight = h
}
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 .|. buttonPressMask}
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]
color <- queryColor disp cmap $ Graphics.X11.Xlib.Types.Color (whitePixel disp $ fromIntegral . viScreen $ visualinfo) 0 0 0 0
pixmap <- createPixmap disp wnd 1 1 1
cursor <- createPixmapCursor disp pixmap pixmap color color 0 0
sync disp False
storeName disp wnd "HTanks"
mapWindow disp wnd
waitForMapNotify disp wnd
defineCursor disp wnd cursor
ctx <- with visualinfo $ \vi -> createContext disp vi (Context nullPtr) True
makeCurrent disp wnd ctx
wa <- getWindowAttributes disp wnd
s <- resize (glxLevelWidth glx) (glxLevelHeight glx) (fromIntegral . wa_width $ wa) (fromIntegral . wa_height $ wa)
return glx
{ glxDisplay = disp
, glxWindow = wnd
, glxContext = ctx
, glxDeleteWindow = delwnd
, glxScale = s
}
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
usleep _ usecs = glxUsleep $ fromIntegral usecs
nextEvent' :: GLX -> XEventPtr -> IO (GLX, Maybe SomeEvent)
nextEvent' glx xevent = do
p <- pending $ glxDisplay glx
if (p > 0) then do
Graphics.X11.Xlib.Event.nextEvent (glxDisplay glx) xevent
(newglx, ev) <- handleEvent glx xevent
if isJust ev then
return (newglx, ev)
else
nextEvent' newglx xevent
else
return (glx, Nothing)
handleEvent :: GLX -> XEventPtr -> IO (GLX, Maybe SomeEvent)
handleEvent glx xevent = do
event <- getEvent xevent
let evtype = ev_event_type event
case () of
_ | evtype == configureNotify -> do
s <- resize (glxLevelWidth glx) (glxLevelHeight glx) (fromIntegral . ev_width $ event) (fromIntegral . ev_height $ event)
return (glx {glxScale = s}, Nothing)
| evtype == keyPress -> do
keysym <- keycodeToKeysym (glxDisplay glx) (ev_keycode event) 0
case () of
_ | keysym == xK_Escape -> return (glx, Just $ SomeEvent QuitEvent)
| keysym == xK_Up -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyUp)
| keysym == xK_Down -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyDown)
| keysym == xK_Left -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyLeft)
| keysym == xK_Right -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyRight)
| keysym == xK_w -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyUp)
| keysym == xK_s -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyDown)
| keysym == xK_a -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyLeft)
| keysym == xK_d -> return (glx, Just $ SomeEvent $ KeyPressEvent KeyRight)
| otherwise -> return (glx, Nothing)
| evtype == keyRelease -> do
keysym <- keycodeToKeysym (glxDisplay glx) (ev_keycode event) 0
case () of
_ | keysym == xK_Up -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyUp)
| keysym == xK_Down -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyDown)
| keysym == xK_Left -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyLeft)
| keysym == xK_Right -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyRight)
| keysym == xK_w -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyUp)
| keysym == xK_s -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyDown)
| keysym == xK_a -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyLeft)
| keysym == xK_d -> return (glx, Just $ SomeEvent $ KeyReleaseEvent KeyRight)
| otherwise -> return (glx, Nothing)
| evtype == clientMessage -> do
if ((glxDeleteWindow glx) == (fromIntegral . head . ev_data $ event))
then
return (glx, Just $ SomeEvent QuitEvent)
else
return (glx, Nothing)
| evtype == motionNotify -> do
(x, y) <- windowToGameCoords glx (ev_x event) (ev_y event)
wa <- getWindowAttributes (glxDisplay glx) (glxWindow glx)
return (glx, Just $ SomeEvent $ MouseMotionEvent x y)
| evtype == buttonPress -> do
(x, y) <- windowToGameCoords glx (ev_x event) (ev_y event)
wa <- getWindowAttributes (glxDisplay glx) (glxWindow glx)
return (glx, Just $ SomeEvent $ MousePressEvent x y)
| otherwise -> return (glx, Nothing)
windowToGameCoords :: Integral a => GLX -> a -> a -> IO (Float, Float)
windowToGameCoords glx x y = getWindowAttributes (glxDisplay glx) (glxWindow glx) >>= \wa ->
let w = fromIntegral . wa_width $ wa
h = fromIntegral . wa_height $ wa
in return (((-w/2 + wx)/sx + lw/2), ((h/2 - wy)/sy + lh/2))
where sx = fromRational . glxScale $ glx
sy = sx*(cos $ pi/6)
lw = fromIntegral . glxLevelWidth $ glx
lh = fromIntegral . glxLevelHeight $ glx
wx = fromIntegral x
wy = fromIntegral y
resize :: Int -> Int -> Int -> Int -> IO Rational
resize lw lh w h = do
let aspect = (fromIntegral w)%(fromIntegral h)
s = (max ((fromIntegral lw)/aspect) (fromIntegral lh))/2
sf = fromRational s
aspectf = fromRational aspect
matrixMode $= Projection
loadIdentity
--ortho (-sf*aspectf) (sf*aspectf) (-sf) sf (-1) 1
--scale 1 1 (0.1 :: GLfloat)
frustum (-sf*aspectf) (sf*aspectf) (-sf) sf 10 100
rotate (-30) $ Vector3 1 0 (0 :: GLfloat)
translate $ Vector3 (-(fromIntegral lw)/2) ((fromIntegral lh)/2) (-11 :: GLfloat)
matrixMode $= Modelview 0
viewport $= ((Position 0 0), (Size (fromIntegral w) (fromIntegral h)))
return $ (fromIntegral h)/(2*s)
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
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