I've come across a few projects now that require libc on Linux. I'm using the latest Ubuntu (9.04) + Lazarus (9.26-4), and it says it can't find libc. After doing some basic research, it looks like this would be dependent upon the compiler? How can I download and setup libc so Lazarus will compile apps that use it happily? I cannot find a lot of information on this -------------- next part --------------
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I've come across a few projects now that require libc on Linux. I'm using the latest Ubuntu (9.04) + Lazarus (9.26-4), and it says it can't find libc.

Did you install the development package for libc?

DoDi

matt shaffer wrote

I've come across a few projects now that require libc on Linux. I'm using the latest Ubuntu (9.04) + Lazarus (9.26-4), and it says it can't find libc.

Library libc or unit libc? Is Ubuntu one of those distributions that fragment FPC over umpteen packages? If so, see if there is a separate one for the "libc" unit. (which is a Kylix legacy package)

Note that it would be wisest to get rid of libc alltogether, because it is linux/x86 only.

If you are using 64-bit Ubuntu, that might even be the cause of your problem. More info:

http://wiki.freepascal.org/libc_unit

After doing some basic research, it looks like this would be dependent upon the compiler? How can I download and setup libc so Lazarus will compile apps that use it happily? I cannot find a lot of information on this

Install the deb, if Lazarus uses a wildcard in its FPC searchpath, the rest will go automatically.

Marco van de Voort het geskryf:

Note that it would be wisest to get rid of libc alltogether, because it is linux/x86 only.

Remember to mention that that is only the case for the 'libc' unit! The libc library is available on just about any unix-type OS (linux, *bsd, etc.).

There is a wiki pages explaining the difference of libc as well.

http://wiki.lazarus.freepascal.org/libc_unit

Regards,
- Graeme -

Unit libc. AFAIK no, Ubuntu doesn't distribute FPC over tons of packages, but I just installed everything (FPC/Laz + sources) from one package).

On a somewhat related note, I'm done trying to develop anything interesting on Linux. After installing ~10 extra random dependencies to build OGL apps, everything's still being a pain. There's basically no libraries to make things 3D, so I was trying out GLScene. First, the actual package itself + demos have sources that are nearly compatible with Linux, but require just a tiny bit of editing (GLLCLViewer to GLViewer, for instance in the uses claus). Found out the hard way that unless the app is built as GTK1, double buffering seems to fail. And after installing the GLScene package, every app that uses glscene wants to rebuild all of glscene before it compiles the stupid demos! And there are a lot of demos that are broken even though they're supposed to work... *Throws in towel*. If anything, I'll stick to 2d on Linux using my favorite little buddy, Andorra 2D.

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BAH! I completely forgot in the last email (due to my large rant), but if you couldn't tell I did find and install unit libc happily.

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matt shaffer het geskryf:

BAH! I completely forgot in the last email (due to my large rant), but if you couldn't tell I did find and install unit libc happily.

I know nothing about 3D stuff so can't comment on any of those. As for dependencies. Linux ships software packages in sets of 3.
- runtime package (xxx)
- source code package (xxx-src)
- development package (xxx-dev)

By default you normally have the runtime packages installed. If you do any software development on a Linux system, you need to install the development packages so you can link to them at compile time. If you do C/C++ programming or want to modify application available in Linux, then you might need to install the source code packages (most software under Linux is written in C/C++).

So once you understand how Linux is different to say Windows, it's not really that hard. But you have to remember that Linux is NOT Windows, so it is allowed to be different.

Regards,
- Graeme -

On a somewhat related note, I'm done trying to develop anything interesting on Linux. After installing ~10 extra random dependencies to build OGL apps, everything's still being a pain. There's basically no libraries to make things 3D, so I was trying out GLScene.

I don't know anything about GLScene, but I am doing 3D stuff on Linux for years and don't have any problems. I don't know what your random packages are but I only need Lazarus and a working 3D driver and that's it. Lazarus comes with a cross platform OpenGL component in $LazarusDir/components/opengl. Drop it on a form and you are good to go. If you tell me what you are trying to achieve I may be able to assist.

R.

Well I'm basically looking for a 3D library that has

Model loading (Blender does a good job of exporting almost anything, so long as the library does not have its own format I should be good) Texturing (Cannot get this to work with GLScene)
Real time model transforming (For simple animated waves + models) Lighting effects (Shadows, colored lights)
Particles
OpenGL for hardware acceleration
Demo programs, because I cannot learn anything without exploring first.

I just cannot find many resources regarding cross platform 3D graphics with FPC; Only thing I found was GLScene and it was a big let down.. The cast II engine looked good but it does not yet support openGL so no cross platform compatibility is really there yet.

Also I'm unsure of whether or not dropping an openGL component on the form would have solved my problems (I imagine it might have, but I forgot Lazarus had one), but the wiki article I read on ld -l seemed to imply that installing various (development) libraries was necessary, and after poking around the internet to find out which libraries I should install I got the error messages to go away.

I'm not one of those people who needs a visible component, so long as the library contains demo apps & compiles easily and happily I should be good.

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Sounds like a game engine to me. I am not aware of any cross platform pascal game engine. My own (non-game-)engine does some of the stuff you need but particles, shadows and mesh transformation (I think this is what you meant) are not implemented yet and will not be for the foreseeable future due to various reasons. There are some good C++ cross platform engines out there like Ogre and Irrlicht. If you are willing to create bindings you should be able to use these. I know that Ogre has Python bindings so it should be possible.

I just cannot find many resources regarding cross platform 3D graphics with FPC

That's because there aren't any. 3D graphics coding is in the firm grip of C++ although lately Java made some steps into this territory. Low level 3D graphics coding is no walk in the park so there are not many developers doing this kind of stuff and less doing it with FPC and much less on Linux.

Also I'm unsure of whether or not dropping an openGL component on the form would have solved my problems

If you are not into low level graphics coding (OpenGL) then it would not have helped. The component just offers an context where OpenGL can render to. But you sound like you want to do high level graphics coding so you need an engine. Nevertheless you can try the OpenGL example in examples/openglcontrol to see that cross platform 3D graphics are possible with Lazarus/FPC. I wrote it back in the day when I started to learn OpenGL and Lazarus was still young (not even the form designer was working correctly) and it was not updated since so it is no good tutorial for the API.

R.

...

R.

You may study the new ones for you among the following sites :

http://vrmlengine.sourceforge.net/
http://sourceforge.net/projects/gradlib/
http://sourceforge.net/projects/s3dpros/
http://www.ndrw.co.uk/
http://allegro-pas.sourceforge.net/
http://www.delphigamer.com/main.php
http://www.pascalgamedevelopment.com/forum/
http://www.noeska.com/en.aspx
http://andorra.sourceforge.net/
http://glscene.sourceforge.net/wikka/HomePage
http://www.delphigl.com/index2.php
http://www.graphics32.org/wiki/
http://www.sulaco.co.za/
http://www.libsdl.org/
http://www.dummzeuch.de/delphi/rxlibsf/english.html

Thank you very much .

Mehmet Erol Sanliturk

IIRC glscene supports most (if not all) of this. It works pretty well for me on 32-bit linux with gtk1 even thou there are still some glitches regarding bitmap manipulation.
It should also work with gtk2, but I'm not using gtk2 yet, so I don't know about the related problems.
It also compiles and runs on 64-bit, however, there are more problems to expect.
Some demos work, some need a little tweaking. Patches are welcome. Just be sure to use the svn version of glscene and report problems/send patches in mantis (project "Lazarus-CCR", category "glscene"). Also consider joining the #glscene channel on frenode.net irc.

regards
Burkhard