/usr/share/doc/libghc-glut-doc/examples/RedBook/Texture3D.hs is in libghc-glut-doc 2.4.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | {-
Texture3D.hs (adapted from texture3d.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 using a three-dimensional texture. It creates
a 3D texture and then renders two rectangles with different texture
coordinates to obtain different "slices" of the 3D texture.
-}
import Control.Monad ( unless )
import Foreign ( withArray )
import System.Exit ( exitFailure, exitWith, ExitCode(ExitSuccess) )
import Graphics.UI.GLUT
-- Create checkerboard image
imageSize :: TextureSize3D
imageSize = TextureSize3D 16 16 16
withImage :: (PixelData (Color3 GLubyte) -> IO ()) -> IO ()
withImage act =
withArray [ Color3 (s * 17) (t * 17) (r * 17) |
r <- [ 0 .. fromIntegral d - 1 ],
t <- [ 0 .. fromIntegral h - 1 ],
s <- [ 0 .. fromIntegral w - 1 ] ] $
act . PixelData RGB UnsignedByte
where (TextureSize3D w h d) = imageSize
myInit :: IO ()
myInit = do
clearColor $= Color4 0 0 0 0
shadeModel $= Flat
depthFunc $= Just Less
rowAlignment Unpack $= 1
[texName] <- genObjectNames 1
textureBinding Texture3D $= Just texName
textureWrapMode Texture3D S $= (Repeated, Clamp)
textureWrapMode Texture3D T $= (Repeated, Clamp)
textureWrapMode Texture3D R $= (Repeated, Clamp)
textureFilter Texture3D $= ((Nearest, Nothing), Nearest)
withImage $ texImage3D NoProxy 0 RGB' imageSize 0
texture Texture3D $= Enabled
display :: DisplayCallback
display = do
clear [ ColorBuffer, DepthBuffer ]
-- resolve overloading, not needed in "real" programs
let texCoord3f = texCoord :: TexCoord3 GLfloat -> IO ()
vertex3f = vertex :: Vertex3 GLfloat -> IO ()
renderPrimitive Quads $ do
texCoord3f (TexCoord3 0 0 0); vertex3f (Vertex3 (-2.25) (-1) 0)
texCoord3f (TexCoord3 0 1 0); vertex3f (Vertex3 (-2.25) 1 0)
texCoord3f (TexCoord3 1 1 1); vertex3f (Vertex3 (-0.25) 1 0)
texCoord3f (TexCoord3 1 0 1); vertex3f (Vertex3 (-0.25) (-1) 0)
texCoord3f (TexCoord3 0 0 1); vertex3f (Vertex3 0.25 (-1) 0)
texCoord3f (TexCoord3 0 1 1); vertex3f (Vertex3 0.25 1 0)
texCoord3f (TexCoord3 1 1 0); vertex3f (Vertex3 2.25 1 0)
texCoord3f (TexCoord3 1 0 0); vertex3f (Vertex3 2.25 (-1) 0)
flush
reshape :: ReshapeCallback
reshape size@(Size w h) = do
viewport $= (Position 0 0, size)
matrixMode $= Projection
loadIdentity
perspective 60 (fromIntegral w / fromIntegral h) 1 30
matrixMode $= Modelview 0
loadIdentity
translate (Vector3 0 0 (-4 :: GLfloat))
keyboard :: KeyboardMouseCallback
keyboard (Char '\27') Down _ _ = exitWith ExitSuccess
keyboard _ _ _ _ = return ()
main :: IO ()
main = do
(progName, _args) <- getArgsAndInitialize
initialDisplayMode $= [ SingleBuffered, RGBMode, WithDepthBuffer ]
initialWindowSize $= Size 250 250
initialWindowPosition $= Position 100 100
createWindow progName
-- we have to do this *after* createWindow, otherwise we have no OpenGL context
exts <- get glExtensions
unless ("GL_EXT_texture3D" `elem` exts) $ do
putStrLn "Sorry, this demo requires the GL_EXT_texture3D extension."
exitFailure
myInit
reshapeCallback $= Just reshape
displayCallback $= display
keyboardMouseCallback $= Just keyboard
mainLoop
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