[HOpenGL] problem with displayCallback and Double buffering

[Marc A. Ziegert]

i've installed ghc-6.3.20031102 (still the "-lGL" <--> "-lGLU" bug in package.conf).
that version works now, thanks.

now i want to use ghci, especially with
forkIO mainLoop
, but that does not seem to work anymore. is that a forkIO bug?

the renaming of DoubleBuffered and WithDepthBuffer is convenient. :)

- marc




Am Freitag, 31. Oktober 2003 18:48 schrieb Sven Panne:
> Marc A. Ziegert wrote:
>  > does anyone else have this problem?  i want to use double buffering,
>  > but swapBuffers does not seem to work.
> 
> Works for me with the current version from CVS on x86 Linux, see below.
> 
>  > to set the active window to... the active window (i think that has
>  > to work!) does not work, too. [...]
> 
> I guess with "active" you mean "current", but this works for me, too.
> Remember that you can't access currentWindow (or windowPosition,
> windowSize, etc.) before mainLoop is entered, this is how GLUT works.
> 
> Cheers,
>     S.
> 
> ----------------------------------------------------------------------
> import Graphics.UI.GLUT
> 
> dc :: DisplayCallback
> dc = do
>     clearColor $= Color4 0 0 1 0
>     clear [ColorBuffer, DepthBuffer]
>     putStrLn "begin swapBuffers"
>     swapBuffers
>     putStrLn "end swapBuffers"
> 
> main :: IO ()
> main = do
>     getArgsAndInitialize
>     initialDisplayMode $= [DoubleBuffered, WithDepthBuffer]
>     b <- get displayModePossible
>     putStrLn $ "displayModePossible? ..." ++ show b
>     createWindow "main"
>     displayCallback $= dc
>     mainLoop
> ----------------------------------------------------------------------
> panne at jeanluc:~> ghc --make first.hs
> Chasing modules from: first.hs
> Compiling Main             ( first.hs, first.o )
> Linking ...
> panne at jeanluc:~> ./a.out
> displayModePossible? ...True
> begin swapBuffers
> end swapBuffers
> [ blue window appears, iconized it and de-iconized it again ]
> begin swapBuffers
> end swapBuffers
> 
> 
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