plan9 man page for currentcontext

gl_getcontext(3)						Svgalib User Manual						  gl_getcontext(3)

NAME

       gl_getcontext, currentcontext - get the current graphics contents.

SYNOPSIS

       #include <vgagl.h>

       void gl_getcontext(GraphicsContext *gc);

       extern GraphicsContext currentcontext; /* this is already in vgagl.h */

DESCRIPTION

       Save the current context in the structure variable gc.

       You can also get the current context from the global variable currentcontext;

       However, simply access single elements in this structure with the macros given in vgagl(7) but do not copy currentcontext in another struc-
       ture. This is because the size of the structure might change and your program does not know it when it will be linked dynamically to future
       svgalib versions.

       Instead use gl_allocatecontext(3) to allocate such a structure, fill it with gl_getcontext and release it with free(3) after usage.

SEE ALSO

       svgalib(7),  vgagl(7),  svgalib.conf(5),  threedkit(7),	testgl(1), plane(1), wrapdemo(1), gl_allocatecontext(3), gl_copyboxfromcontext(3),
       gl_copyboxtocontext(3),	gl_freecontext(3),  gl_setcontext(3),  gl_setcontextheight(3),	gl_setcontextvga(3),   gl_setcontextvgavirtual(3),
       gl_setcontextvirtual(3), gl_setcontextwidth(3).

AUTHOR

       This  manual  page  was	edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced demo as well as of the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or  corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						    2 Aug 1997							  gl_getcontext(3)