OpenGL in Slackware

Sephiroth · 12-01-2006, 11:24 AM

Hi,

I'm trying to write OpenGL programs in slack and I'm wondering if slack already has the necessary libraries. If not, where can I get them? I'm writing the programs in C so the compiler shouldn't be an issue.

Spinlock · 12-01-2006, 12:04 PM

As far as I can tell, yes. X11-devel should be the package you want.*

*I'm not 100% sure about this.

Rayning · 12-01-2006, 12:35 PM

bit off topic but FF7 was an awesome game.

tuxdev · 12-01-2006, 01:18 PM

Slack always has everything you need, or really easy to get. I'm assuming that you've already got an OpenGL capable card and drivers that go with it. You will either need GLUT or SDL to setup contexts and other stuff.

Sephiroth · 12-02-2006, 12:23 PM

I have an ATI rage 128. It's one of the cards listed when you configure X. OpenGL apps run fine.

When I slocate the header files gl.h and glut.h, I find them in /usr/X11R6/include/GL. Can I use these or do I have to get something else? Also, how would I go about including them as headers in the programs I write?

Thanks

tuxdev · 12-02-2006, 12:57 PM

Yep, those are the headers to use

Code:

#include <GL/gl.h>
#include <GL/glut.h>

Sephiroth · 12-02-2006, 01:31 PM

Thanks. I'm thinking I have to compile with linkers too?

tuxdev · 12-02-2006, 01:54 PM

I'm not sure what you mean. Example?

Sephiroth · 12-02-2006, 03:00 PM

well in windows I find that I have to add linker flags for my GL programs even with the includes defined. My programs are not compiling thus far, but examples that I've downloaded from the net are doing fine. So I'm thinking maybe I need to use the -L option in gcc to link the libraries too. I'll figure it out

Sephiroth · 12-02-2006, 03:09 PM

I've solved the problem in mere minutes

The command I have to use to compile properly is

gcc -o main main.c -I /usr/X11R6/include/ -L /usr/X11R6/lib/ -lglut -lGL -lGLU -lX11 -lXmu -lXi -lm

tuxdev · 12-02-2006, 03:34 PM

Ah, see that. In *nix, it is custom to compile your stuff into .o files, then link them all together (Windows does that too, but kind of behind your back). With simple one-file programs, the .o step could be skipped like you did in that.

Try removing the -I and -L. Those directories should already be in your include and library paths.

Sephiroth · 12-02-2006, 06:16 PM

strangely it doesn't work without linkers. Even with the includes, it did not compile until I linked the libraries directly. I probably just forgot to set a path somewhere.

Thanks for your help. It's working great now