VOGL is a library of C routines which try to allow a programmer to write programs which can be moved to machines which have the Silicon Graphics GL library on them. It is based entirely on the VOGLE graphics library, and as a result can handle circles, curves, arcs, patches, and polygons in a device independent fashion. Simple hidden line removal is also available via polygon backfacing. Access to hardware text and double buffering of drawings depends on the driver. There is also a FORTRAN interface but as it goes through the C routines FORTRAN users are warned that arrays are in row-column order in C. Both the long FORTRAN names and the shortened six character names are supported. People interested in using software text should see the hershey library, HERSHEY(3). More information on the FORTRAN interface is contained in vogl.doc; the interface described herein is the C interface.
Some routines are only available in VOGL. If you include
them in programs it is advisable to put #ifdef VOGL ...
#endif around them. The constant VOGL is defined whenever a
VOGL header file is included.
It should be noted that there are a number of routines that take the type Angle for some of their parameters. All angles specified this way are actually Integer Tenths Of Degrees. (Don't ask!)