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{-
Clip.hs (adapted from clip.c which is (c) Silicon Graphics, Inc.)
Copyright (c) Sven Panne 2002-2005 <sven.panne@aedion.de>
This file is part of HOpenGL and distributed under a BSD-style license
See the file libraries/GLUT/LICENSE
This program demonstrates arbitrary clipping planes.
-}
import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
myInit :: IO ()
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Flat
display :: DisplayCallback
display = do
clear [ ColorBuffer ]
-- resolve overloading, not needed in "real" programs
let color3f = color :: Color3 GLfloat -> IO ()
translatef = translate :: Vector3 GLfloat -> IO ()
rotatef = rotate :: GLfloat -> Vector3 GLfloat -> IO ()
color3f (Color3 1 1 1)
preservingMatrix $ do
translatef (Vector3 0 0 (-5))
-- clip lower half -- y < 0
clipPlane (ClipPlaneName 0) $= Just (Plane 0 1 0 0)
-- clip left half -- x < 0
clipPlane (ClipPlaneName 1) $= Just (Plane 1 0 0 0)
rotatef 90 (Vector3 1 0 0)
renderObject Wireframe (Sphere' 1 20 16)
flush
reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
perspective 60 (fromIntegral w / fromIntegral h) 1 20
matrixMode $= Modelview 0
keyboard :: KeyboardMouseCallback
keyboard (Char '\27') Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()
main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode ]
initialWindowSize $= Size 500 500
initialWindowPosition $= Position 100 100
createWindow progName
myInit
displayCallback $= display
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboard
mainLoop
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