fpc/packages/opengl/glunits.txt

  glunits.zip
***************

These are the Delphi conversions of gl.h, glu.h, glut.h and
glext.h. Copy them to your Delphi\Lib directory or somewhere else
in your compiler's search path and you're all set!

To use these units with OpenGL drivers other than Microsoft's,
you need to manually initialize three DLL libraries. For example:

  LoadOpenGL('opengl.dll');
  LoadGLu('glu.dll');
  LoadGlut('glut.dll');  // Optional

If you do this, make sure to free the previously loaded library
first:

  FreeOpenGL;
  FreeGLu;
  FreeGlut;

If the DLLs the application is trying to load cannot be found, an
exception will be raised. By default, the units will try to load
OpenGL32.dll, GLu32.dll and Glut32.dll. No exception will be
thrown if they are not found, so if you want to support multiple
OpenGL implementations in your app, it's probably best to
explicitly load the DLLs explicitly as shown above. This way, you
can properly trap errors.

A final note: if you have a 3D card with an OpenGL ICD, you do NOT
need to load the driver yourself. Microsoft's OpenGL32.dll will
automatically detect and use your 3D card's drivers, so the
default settings in these units will work perfectly.

The fourth file in this archive, glext.pas, contains declarations
of constants and function prototypes of most OpenGL extensions.
To use an extension, you just need to check if it's supported, and
load it's functions with wglGetProcAddress() if it is. You can
check the presence of an extension with the included function
glext_ExtensionSupported(). By using glext.pas, you no longer have
to copy/paste/translate declarations from the extension specs. If
you should come across an extension that isn't yet included in
glext.pas, I'd appreciate it if you could drop me a line so I can
add it ASAP.

  Tom Nuydens ([email protected])