NAME
vga_setmodeX - try to set Mode X-like memory organization
SYNOPSIS
#include <vga.h>
void vga_setmodeX(void);
DESCRIPTION
Try to enable Mode X-like memory organization for 256 color modes using
up to 256K of memory like 320x200x256 and 640x400x256.
Modes like 320x240x256 etc. are Mode X-like by default.
vga_modeinfo(3) lists which modes have Mode X memory layout.
A mode X like memory layout means that memory is organized in four
pages (set_page(3)) and that the top most pixel 0,1,2,3 are the first
pixel in pages 0,1,2,3. Pixels 4,5,6,7 are than the second pixels in
pages 0,1,2,3.
The other, packed pixel, mode will have pixel 0,1,2,3 as pixel 0,1,2,3
in page 0 and so on. It will only use the next pages if the size of the
first 64K page is exceeded. Most SVGA 256 color modes work this way.
This is not guaranteed to work. Probably a new mode should be defined
for planar 320x200x256.
SEE ALSO
svgalib(7), vgagl(7), libvga.config(5), vgatest(6), vga_getmodeinfo(3),
vga_setmode(3), vga_setpage(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.