GLUT distribution fortran source examples

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UNFORTUNATELY, attempting to compile fortran opengl on IRIX 6.2 fails.

We discovered that attempting to compile with libfGL.a produces a rash of "Unresolved data symbol" errors with the loader, LD(1).

These unresolved symbols are OpenGL 1.1 entry points, and we don't support 1.1 yet. It turns out that libfGL.a has 1.1 bindings, and all wrappers are in a single object file. The ramification is that calling any fGL routine pulls in wrappers for all entry points, including the the 1.1 versions of the extensions. Thus, any program which links with libfGL.a will have the unresolved symbols you encountered.

There are two possible workarounds to this problem.

1. If you add "-Wl,-U" to the link line (or just "-U" if you invoke ld directly) you will get an executable. You then must
   setenv _RLD_ARGS -ignore_unresolved
   to run the executable.

2. You can create a stubs file to resolve the missing entry points. They will (should) never be called, so all it does is make the linker happy.

So for the present, we include the source for people still running IRIX 5, but for those with IRIX 6, you will have to resort to one of the above hacks if you want to attempt compiles on OpenGL using fortran.

This directory contains the GLUT distribution fortran examples programs leveraging GLUT functionality.

NOTE: ../../lib/fglut/libfglut.a in concert with ../../lib/a href="../../lib/glut/">glut/libglut.a are both employed to generate the four binaries in this directory. Hence, if you wish to copy over any specific program for the purposes of experiementation and recompilation, you'll need to either

1. download this entire directory, plus, ../../GL/fgl.h, ../../GL/fglu.h, and ../../GL/fglut.h, as well as ../../lib/glut/libglut.a.tar.Z, ../../lib/glut/libfglut.a.tar.Z,
   or,
2. get everything by simply grabbing the entire ../../glut-3.1.tar.Z (1,158,329 bytes) 3.1 version of the GLUT distribution, to get everything that way.

The following fortran example programs are included in version 3.1 of GLUT:

   example:    An example program demonstrating GlUT callback
               functionality for mouse/button events and a popup menu
               with a roll-over submenu.  (example.f)

   fbitfont:   Renders sample text using builtin GLUT bitmap fonts.
               (fbitfont.f)

   fscene:     Demonstrates the use of the GL lighting model.  Objects
               are drawn using a red material characteristic.  A
               single light source illuminates the objects.  (fscene.f)

   sphere:     Draws a red lit sphere.  (sphere.f)