March 2007 - HOpenGL - Haskell.org

Re: [HOpenGL] OpenGL and GLUT packages on Windows cause undefeined reference problem if build theirs myself
by Sven Panne 15 Mar '07

15 Mar '07

On Tuesday 13 March 2007 16:35, Sigbjorn Finne wrote: > Some (early morning & obvious) guesses that might explain > the difference in behaviour: > > - one version is compiled via the NCG, the other via-C > (i.e., the latter gets its calling conventions from the header files.) I think this might it explain it best, so I'll commit those patches. Thanks, S.

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Textures from SDL upside down
by Bas van Dijk 13 Mar '07

13 Mar '07

Hi, I am using HOpenGL in combination with hsSDL (http://darcs.haskell.org/~lemmih/hsSDL) This works great except for texture loading. All my textures are mirrored over the v-axis. So the top of a texture becomes the bottom. I first thought that I got the texture coordinates wrong. But the textures are also flipped on the GLU quadrics. Is there some way to tell (H)OpenGL that a texture is mirrored? I tried glPixelStore parameters but I don't think it is possible that way. Perhaps it is possible to change a hsSDL surface before loading the pixel data. Any advice is welcome. regards, Bas van Dijk

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OpenGL and GLUT packages on Windows cause undefeined reference problem if build theirs myself
by shelarcy 13 Mar '07

13 Mar '07

Hello all, I tried to build OpenGL and GLUT packages on Windows by myself. Then runhaskell Setup.hs build cause below problem. $ runhaskell Setup.hs build Reading parameters from c:\home\ghc-6.7.20070305\libraries\GLUT\GLUT.buildinfo Preprocessing library GLUT-2.1... Building GLUT-2.1... (snip) c:\home\ghc-6.7.20070305\ghc-6.7.20070305\bin\ar.exe q dist\build\libHSGLUT-2.1.a dist\build\Graphics\UI\GLUT.o d (snip) dist\build\Graphics\UI\GLUT\Callbacks\Registration_stub.o Warning: resolving _hs_GLUT_getProcAddress@4 by linking to _hs_GLUT_getProcAddress Use --enable-stdcall-fixup to disable these warnings Use --disable-stdcall-fixup to disable these fixups This problem is already noticed by Pepe Gallardo. http://www.haskell.org/pipermail/hopengl/2006-December/000680.html And same problem cause if build GHC head snapshot myself, too. C:\home\ghc-6.7.20070305\libraries\GLUT\examples\OrangeBook\ogl2brick>C:\home\gh c-6.7.20070305\ghc-6.7.20070305\bin\ghc.exe --make Brick.hs [1 of 1] Compiling Main ( Brick.hs, Brick.o ) Linking Brick.exe ... C:/home/ghc-6.7.20070305/ghc-6.7.20070305/libHSGLUT.a(Extensions__3.o)(.text+0x1 4):fake: undefined reference to `hs_GLUT_getProcAddress@4' C:/home/ghc-6.7.20070305/ghc-6.7.20070305/libHSOpenGL.a(Extensions__3.o)(.text+0 x14):fake: undefined reference to `hs_OpenGL_getProcAddress@4' collect2: ld returned 1 exit status This problem doesn't occure Sigbjorn Finne's build snapshot ... http://www.haskell.org/ghc/dist/current/dist/ http://www.haskell.org/pipermail/cvs-ghc/2007-March/034396.html I don't know why .. but I know why reference is unresolved. CALLCONV is defined stdcall on Windows, but hs_**_getProcAddress (and other cbits's c functions) are build with ccall convention. Attached are darcs patch to fix these problem. But ... I don't know this patch doesn't cause any ptoblem Sigbjorn's next binary release. Because I don't know why OpenGL and GLUT can build correctly under his environment. Best Regars, -- shelarcy <shelarcy capella.freemail.ne.jp> http://page.freett.com/shelarcy/

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