[DaGuy]

Do any of you know how to handle this type of error? I am linking to the OpenGL framework and I swear that I haven't been messing around with system files as root -I learned my lesson some time ago


<font color = red> /usr/bin/ld: /Users/bido/OpenGL/build/intermediates/OpenGL.build/master.o illegal reference to symbol: _glBegin defined in indirectly referenced dynamic library /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
/usr/bin/ld: /Users/bido/OpenGL/build/intermediates/OpenGL.build/master.o illegal reference to symbol: _gluOrtho2D defined in indirectly referenced dynamic library /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU.dylib </font>

Here's the code:

<font color = blue>
#import "MyOpenGLView.h"
#import &lt;GLUT/glut.h&gt;

@implementation MyOpenGLView

- (void) drawRect: (NSRect) theRect;
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0., 2., 0., 1.);

glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);

glColor3f(0.0, 0.0, 1.0);
glLineWidth(1.0);

glBegin(GL_LINE_LOOP);
glVertex2f(0.05, 0.05);
glVertex2f(1.95, 0.05);
glVertex2f(1.80, 0.85);
glVertex2f(0.20, 0.85);
glEnd();

glFlush();
}
@end </font>

Thanks!


]

[ 03-22-2002: Message edited by: DaGuy ]

[Angus_D]

You need to link against OpenGL.framework. Do this by adding it to your project (Project -&gt; Add Frameworks...).

[DaGuy]

Thanks Angus_D, that took care of it. I was just linking to the GLUT framework. What do you recommend for a good OpenGL book . My preference is the O'Reilly type of book -whatever that means.

Thanks again,

[Detrius]

Originally posted by DaGuy:
<STRONG>Thanks Angus_D, that took care of it. I was just linking to the GLUT framework. What do you recommend for a good OpenGL book . My preference is the O'Reilly type of book -whatever that means.

Thanks again,


</STRONG>

There are plenty of good references on the internet. Go to google and do a search for "OpenGL developer documentation." OpenGL.org has good documentation, and the search will pop up several more sources.

[mdcarter1]

I don't have the links on hand, but there are two free books you can download that are ok, especially since they are free. Most people call them the blue and the red book. One is instruction and one is reference.
If i find it, i will post it here.

[Jeff Binder]

You can get online versions of the Red and Blue book here:
http://ask.ii.uib.no/ebt-bin/nph-dwe...oper/OpenGL_PG http://ask.ii.uib.no/ebt-bin/nph-dwe...oper/OpenGL_RM


These are very old versions however, so they don't include newer features in OpenGL, some of which are very useful. I recommend you just go out and buy the 1.2 version of the OpenGL Programming Guide (the Red Book). You won't regret it. You needn't bother with the blue book, as it's pretty much the same thing as the OpenGL man pages that come with the developer tools. Here's the official list of OpenGL books (The Red Book is the first one):
http://www.opengl.org/developers/doc...ion/books.html