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 current‐
context;
However, simply access single elements in this structure with the
macros given in vgagl(7) but do not copy currentcontext in another
structure. 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 ALSOsvgalib(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_setcon‐
textheight(3), gl_setcontextvga(3), gl_setcontextvgavirtual(3), gl_set‐
contextvirtual(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)
