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{-
Light.hs (adapted from light.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 the use of the OpenGL lighting model. A sphere
is drawn using a grey material characteristic. A single light source
illuminates the object.
-}
import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
myInit :: IO ()
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Smooth
materialSpecular Front $= Color4 1 1 1 1
materialShininess Front $= 50
position (Light 0) $= Vertex4 1 1 1 0
lighting $= Enabled
light (Light 0) $= Enabled
depthFunc $= Just Less
display :: DisplayCallback
display = do
clear [ ColorBuffer, DepthBuffer ]
renderObject Solid (Sphere' 1 20 16)
flush
reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
let wf = fromIntegral w
hf = fromIntegral h
if w <= h
then ortho (-1.5) 1.5 (-1.5 * hf/wf) (1.5 * hf/wf) (-10) 10
else ortho (-1.5 * wf/hf) (1.5 * wf/hf) (-1.5) 1.5 (-10) 10
matrixMode $= Modelview 0
loadIdentity
keyboard :: KeyboardMouseCallback
keyboard (Char '\27') Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()
main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode, WithDepthBuffer ]
initialWindowSize $= Size 500 500
initialWindowPosition $= Position 100 100
createWindow progName
myInit
displayCallback $= display
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboard
mainLoop
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