/usr/share/doc/libhugs-glut-bundled/examples/GLUT/RedBook/Polys.hs is in libhugs-glut-bundled 98.200609.21-5.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Polys.hs (adapted from polys.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 polygon stippling.
-}
import System.Exit ( exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
fly :: IO GLpolygonstipple
fly = newPolygonStipple [
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60,
0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20,
0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,
0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22,
0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,
0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC,
0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,
0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0,
0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0,
0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,
0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08,
0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08,
0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08]
halftone :: IO GLpolygonstipple
halftone = newPolygonStipple . take 128 . cycle $ [
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55]
display :: (GLpolygonstipple, GLpolygonstipple) -> DisplayCallback
display (flyStipple, halftoneStipple) = do
clear [ ColorBuffer ]
-- resolve overloading, not needed in "real" programs
let color3f = color :: Color3 GLfloat -> IO ()
rectf = rect :: Vertex2 GLfloat -> Vertex2 GLfloat -> IO ()
color3f (Color3 1 1 1)
-- draw one solid, unstippled rectangle,
-- then two stippled rectangles
rectf (Vertex2 25 25) (Vertex2 125 125)
polygonStipple $= Just flyStipple
rectf (Vertex2 125 25) (Vertex2 225 125)
polygonStipple $= Just halftoneStipple
rectf (Vertex2 225 25) (Vertex2 325 125)
polygonStipple $= (Nothing :: Maybe GLpolygonstipple)
flush
myInit :: IO (GLpolygonstipple, GLpolygonstipple)
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Flat
flyStipple <- fly
halftoneStipple <- halftone
return (flyStipple, halftoneStipple)
reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
ortho2D 0.0 (fromIntegral w) 0.0 (fromIntegral h)
keyboard :: KeyboardMouseCallback
keyboard (Char '\27') Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()
main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode ]
initialWindowSize $= Size 350 150
createWindow progName
stipples <- myInit
displayCallback $= display stipples
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboard
mainLoop
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