这是我试图开始工作的源代码:
在 Main.hs 中:
import Graphics.Rendering.OpenGL
import Graphics.UI.GLUT
import Bindings
import Data.IORef
main = do
(progname,_) <- getArgsAndInitialize
createWindow "Hello World"
reshapeCallback $= Just reshape
keyboardMouseCallback $= Just keyboardMouse
angle <- newIORef 0.0
displayCallback $= display
idleCallback $= Just idle
mouseWheelCallback $= Just mouseWheel
mainLoop
在 Bindings.hs 中:
module Bindings where
import Graphics.Rendering.OpenGL
import Graphics.UI.GLUT
display :: IO ()
display = return ()
overlayDisplay :: IO ()
overlayDisplay = return ()
visibility :: Visibility -> IO ()
visibility v = return ()
reshape :: Size -> IO ()
reshape s@(Size w h) = do
viewport $= (Position 0 0, s)
close :: IO ()
close = return ()
keyboardMouse :: Key -> KeyState -> Modifiers -> Position -> IO ()
keyboardMouse key state modifiers position = return ()
mouseWheel :: WheelNumber -> WheelDirection -> Position -> IO ()
mouseWheel wn wd p = return ()
idle :: IO ()
idle = return ()
如果我在我的代码中使用普通的 glut32.dll 并且没有任何 freeglut 扩展,它可以工作,但我想使用 freeglut 扩展。
当我使用 freeglut.dll 时,将其重命名为 glut32.dll,并将其放在与我的 .exe 相同的文件夹中,它给了我错误:
main: user error (unknown GLUT entry glutInit)
当我以同样的方式使用普通的 glut32.dll 时,我得到了错误:
main: user error (unknown GLUT entry glutMouseWheelFunc)