Initial. Don't... just don't ask.

doc/man3/gl_setcontextvgavirtual.3

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+.TH gl_setcontextvgavirtual 3 "2 Aug 1997" "Svgalib (>= 1.2.11)" "Svgalib User Manual"
+.SH NAME
+gl_setcontextvgavirtual \- set the context to a virtual mode
+
+.SH SYNOPSIS
+.B #include <vgagl.h>
+
+.BI "int gl_setcontextvgavirtual(int " mode );
+
+.SH DESCRIPTION
+Allocate a virtual screen in system memory identical to
+the graphics mode (as defined in
+.BR 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
+hardware.
+
+The only thing you can do with a planar (mode X-like)
+256 color mode is aligned
+.BR gl_putbox ,
+and use it as a target for
+.BR gl_copyscreen .
+
+.SH SEE ALSO
+.BR svgalib (7),
+.BR vgagl (7),
+.BR svgalib.conf (5),
+.BR threedkit (7),
+.BR testgl (1),
+.BR currentcontext (3),
+.BR gl_allocatecontext (3),
+.BR gl_copyboxfromcontext (3),
+.BR gl_copyboxtocontext (3),
+.BR gl_copyscreen (3),
+.BR gl_freecontext (3),
+.BR gl_getcontext (3),
+.BR gl_setcontext (3),
+.BR gl_setcontextheight (3),
+.BR gl_setcontextvga (3),
+.BR gl_setcontextvirtual (3),
+.BR gl_setcontextwidth (3).
+
+.SH 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.