June 2004 - HOpenGL - Haskell.org

Re: HOpenGL on macs?
by Carlos Scheidegger 25 Jun '04

25 Jun '04

> > The problem I'm seeing is that the HOpenGL GLUT window is being > > created without problems, but it seems that no calls are getting > > through to the driver: nothing I do on the display callback gets > > rendered. I have no idea what may be happening, but I wonder if you're > > experiencing the same problem. I'm running OSX 10.3.4 on a > > Radeon-based iBook.. > > No, everything works fine here... more details please (ghc --version, > source code, build command, ...). > You might want to Cc the hopengl(a)haskell.org list, in case someone > there figures it out. Sorry for the lack of details in the previous message... $ ghc --version The Glorious Glasgow Haskell Compilation System, version 6.2.1 The source code: ----- import Graphics.UI.GLUT import Graphics.Rendering.OpenGL main = do (progName, _) <- getArgsAndInitialize createAWindow progName mainLoop createAWindow windowName = do createWindow windowName displayCallback $= displayPoints displayPoints = do clearColor $= Color4 1.0 0.0 0.0 1.0 clear [ColorBuffer] renderPrimitive Polygon $ mapM_ (\ (x,y,z)-> vertex $ Vertex3 x y z) myPoints swapBuffers myPoints :: [(GLfloat, GLfloat, GLfloat)] myPoints = [(-0.25, 0.25, 0.0) ,(0.75, 0.35, 0.0) ,(0.75, -0.15, 0.0) ,(-0.75, -0.25, 0.0)] ----- The build command: $ ghc --make APolygon.hs -o APolygon What happens is that the window seems to be created ok (at least I get a window entitled "APolygon"), but the contents of the window are just plain white. It should be to a red background, and a white polygon should be drawn.. I don't know if I'm doing anything wrong, but it doesn't look like it. I'm sorry I'm unable to give any more OSX specific info.. this is my first mac and I don't have much developer experience on the platform.. Thanks a lot, -carlos

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RE: [HOpenGL] HopenGL on GHC 6.3
by Simon Marlow 16 Jun '04

16 Jun '04

On 15 June 2004 07:14, Shiqi Cao wrote: > Here is the config.log > http://www.haskell.org//pipermail/hopengl/2004-June/000515.html > > I don't know where is log of the configuration. > > After it has been compiled, I set "libexecdir" and "libdir" to the lib > directory. Then I tried ghci, and got the following message, What do you mean by "I set libexecdir..."? Did you follow the normal build procedure, ie. 'make; make install'? Cheers, Simon

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HopenGL on GHC 6.3
by Shiqi Cao 15 Jun '04

15 Jun '04

Hi, Recently, I installed the GHC 6.3 cvs ( ghc-6.3.20040609-src.tar.bz2)which I got from http://www.haskell.org/ghc/dist/current/dist/ I want to have the latest HopenGL, so I did the following autoreconf ./configure --enable-hopengl make all make html make install make install-docs the first question is I can't find OpengGL or HOpenGL in package.conf, the second one is ghc doesn't work well, caos2@shiqicao Haskell $ ghc63 -o hw hw.hs /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/../../../../i686-pc-linux-gnu/bin/ld: cannot find -lHShaskell98 collect2: ld returned 1 exit status the HShaskell98 is in the lib/. The following are three conf files, root@shiqicao ghc-6.3 # cat ghc-6.3.20040609.sh #!/bin/sh libexecdir=/usr/lib/ghc-6.3 libdir=$libexecdir GHCBIN="$libexecdir/ghc-6.3.20040609"; TOPDIROPT="-B$libdir"; #! /bin/bash # Mini-driver for GHC exec $GHCBIN $TOPDIROPT ${1+"$@"} root@shiqicao ghc-6.3 # cat ghc-pkg-6.3.20040609.sh #!/bin/sh libexecdir=/usr/lib/ghc-6.3 libdir=$libexecdir GHCPKGBIN="$libexecdir/ghc-pkg.bin"; PKGCONFOPT="-f $libdir/package.conf"; # Mini-driver for ghc-pkg exec $GHCPKGBIN $PKGCONFOPT ${1+"$@"} root@shiqicao ghc-6.3 # cat ghci-6.3.20040609.sh #!/bin/sh libexecdir=/usr/lib/ghc-6.3 libdir=$libexecdir GHCBIN="/usr/lib/ghc-6.3/ghc-6.3.20040609"; TOPDIROPT="-B/usr/lib/ghc-6.3"; #!/bin/bash GHC_CFLAGS="-optc-fno-pic -optc-fno-stack-protector" # Mini-driver for GHCi exec $GHCBIN $TOPDIROPT ${GHC_CFLAGS} --interactive ${1+"$@"} root@shiqicao ghc-6.3 # Regards, Shiqi Cao

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Re: Open GL, GLUT
by Sven Panne 13 Jun '04

13 Jun '04

[ redirected to hopengl mailing list ] Gracjan Polak wrote: > > Hi all, > > I'd like to make some use of OpenGL with Haskell (under Win2000). > Here is some code: > > > module Main where > import Graphics.Rendering.OpenGL.GL > import Graphics.Rendering.OpenGL.GLU > import Graphics.UI.GLUT > > main = do > ver <- get gluVersion > putStrLn ver > > getArgsAndInitialize > fullScreen > wnd <- createWindow "Hello World" > > vertex (Vertex2 (100::GLint) 100) > return () > > Compilation (linking) fails with: > > $ ghc --make openglapp.hs -o openglapp.exe > Chasing modules from: openglapp.hs > Compiling Main ( openglapp.hs, openglapp.o ) > Linking ... > c:/ghc/ghc-6.2/libHSGLUT.a(Initialization__158.o)(.text+0x123):ghc16024.hc: > unde > fined reference to `glutInit@8' > c:/ghc/ghc-6.2/libHSGLUT.a(Window__61.o)(.text+0x33):ghc14736.hc: > undefined refe > rence to `glutFullScreen@0' > c:/ghc/ghc-6.2/libHSGLUT.a(Window__53.o)(.text+0x85):ghc14736.hc: > undefined refe > rence to `glutCreateWindow@4' > > Manually adding -lglut -lglut32 does not help. Libraries libglut32.a and > libglut.a are there, they contain needed symbols but with '_' prepended, > like _glutInit@8. > > Functions from GL and GLU link perfectly. They do even work correctly > when run. Only GLUT ones do not :( > > Has anybody compiled anything for GL recently? Google pointed me only to > some old, not relevant any more, material. > > Am I missing something obvious here? > > GHC 6.2, installer for Window taken from www.haskell.org, Win2000 > Professional. It compiles fine with GHC 6.2.1 on my Win2k box, you might want to update your GHC installation. There have been quite a few bug fixes, so it might be worth it even when you are not using OpenGL/GLUT. Does it work with 6.2 when you add -O? Just curious... Apart from that, there are a few things you should change in your code: * GL/GLU state can only be accessed after you have a rendering context, i.e. after createWindow * fullScreen only works when you have a current window, i.e. after createWindow * Rendering should only be done in the display callback * The vertex call should probably be within a renderPrimitive. Perhaps Sven Panitz' tutorial might help a bit: http://www.tfh-berlin.de/~panitz/hopengl/ A more up-to-date version of the tutorial is available from the fptools CVS repository, but building it requires some unusual tools, BTW. Cheers, S.

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Textures in Haskell OpenGL
by Hugh Rayner 31 May '04

31 May '04

Hi, I'm using ghc OpenGL on a MacOS X box, and everything is working fine, except that I have no idea how to load textures, and I can't find any examples anywhere on the internet that load textures except ones using the old API. Does anyone have an example I could look at?

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