vga_getgraphmem(3) Svgalib User Manual vga_getgraphmem(3)NAME
vga_getgraphmem - returns the address of the VGA memory
SYNOPSIS
#include <vga.h>
unsigned char *graph_mem; /* This declaration is already in vga.h */
unsigned char *vga_getgraphmem(void);
DESCRIPTION
returns a pointer to the 64K VGA frame buffer window. vga_setpage(3),
vga_setreadpage(3) and vga_setwritepage(3) allow to select which page
of the VGA memory shows up at this position. vga_setlinearaddress‐
ing(3) maps all VGA memory at a consecutive memory area (if the hard‐
ware supports it). In this mode, vga_getgraphmem() will return the
location of this area too. You can also access the global variable
graph_mem, which will also contain this address.
Most demos, esp. vgatest(6) show the simple direct use of this func‐
tion to access screen memory.
SEE ALSOsvgalib(7), vgatest(6), fun(6), testlinear(6), vga_setlinearaddress‐
ing(3), vga_claimvideomemory(3), vga_getmodeinfo(3), vga_setpage(3),
vga_setreadpage(3), vga_setwritepage(3),
AUTHOR
This manual page was edited by Michael Weller <eowmob@exp-math.uni-
essen.de>. The exact source of the referenced function 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) 27 July 1997 vga_getgraphmem(3)