NAME¶
vga_setwritepage - set the 64K SVGA page number
SYNOPSIS¶
#include <vga.h>
void vga_setwritepage(int page);
DESCRIPTION¶
Usually SVGA cards have more than the 64K memory which suffice for an ordinary
VGA. However, the memory window mapped at
vga_getgraphmem(3) is only
64K bytes large.
vga_setwritepage() selects the
page-th 64K
memory chunk to be visible for writes at position
vga_getgraphmem(3).
vga_setreadpage(3) allows a different 64K memory chunk to be modified by
reads from this memory window. This is a very useful feature for screen to
screen pixmap copies. However, not all cards support this in all graphics
modes. Check
vga_modeinfo(3) for availability. Esp. as this feature can
also not be used when in background mode.
Of course, this function must be used in conjunction with
vga_setreadpage(3) but may not be used in conjunction with
vga_setpage(3).
SEE ALSO¶
svgalib(7),
vgagl(7),
libvga.config(5),
fun(6),
vgatest(6),
vga_getgraphmem(3),
vga_claimvideomemory(3),
vga_modeinfo(3)
vga_setpage(3),
vga_setreadpage(3),
vga_setlinearaddressing(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.
