Provided by: libsvga1-dev_1.4.3-31_amd64 bug


       gl_setcontextvgavirtual - set the context to a virtual mode


       #include <vgagl.h>

       int gl_setcontextvgavirtual(int mode);


       Allocate  a  virtual screen in system memory identical to the graphics mode (as defined in
       vga_setmode(3)), and make that the current graphics context.

       The function returns 0 for success and non-zero if  the  mode  is  not  supported  by  the

       The only thing you can do with a planar (mode X-like) 256 color mode is aligned gl_putbox,
       and use it as a target for gl_copyscreen.


       svgalib(7),  vgagl(7),  svgalib.conf(5),   threedkit(7),   testgl(1),   currentcontext(3),
       gl_allocatecontext(3), gl_copyboxfromcontext(3), gl_copyboxtocontext(3), gl_copyscreen(3),
       gl_freecontext(3),     gl_getcontext(3),     gl_setcontext(3),     gl_setcontextheight(3),
       gl_setcontextvga(3), gl_setcontextvirtual(3), gl_setcontextwidth(3).


       This  manual  page  was edited by Michael Weller <>. 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

       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