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#!/usr/bin/perl
# Simple modeline-to-fb.modes translator
# (c) 1998 by Patrick Reynolds
# distributed under the GNU General Public License
# mapping of modeline options to fb.modes options
%options_map = (
"-hsync" => "hsync low",
"-vsync" => "vsync low",
"+hsync" => "hsync high",
"+vsync" => "vsync high",
"interlace" => "laced true",
"doublescan" => "double true"
);
@possible_vxres = ( 640, 800, 1024, 1152, 1280, 1600, 1920, 2048 );
# default settings (override with -d and -r)
$depth = 8;
$rounding = 128;
# parse options
while ($ARGV[0] =~ /^-/) {
$arg = shift;
if ($arg eq "-d" || $arg eq "--depth") {
if (!($arg = shift @ARGV)) {
usage("-d requires an argument");
}
$depth = $arg;
}
elsif ($arg eq "-r" || $arg eq "--rounding") {
if (!($arg = shift @ARGV)) {
usage("-r requires an argument");
}
$rounding = $arg;
}
elsif ($arg eq "-x" || $arg eq "--vxres") {
if (!($arg = shift @ARGV)) {
usage("-x requires an argument");
}
push @possible_vxres, (split/,/,$arg);
@possible_vxres = sort { $a <=> $b } @possible_vxres;
print "new vxres: " . (join ",", @possible_vxres) . "\n";
}
elsif ($arg eq "-h" || $arg eq "--help") {
usage();
}
else {
usage("unknown option: $arg");
}
}
# find out how much video memory is available
open(FBSET, "fbset -i|") || die "could not detect available video memory";
while (<FBSET>) {
if (/Size\s*:\s*(\d+)/) {
$size = $1;
last;
}
}
if (!$size) { die "could not detect available video memory"; }
# huge kludge (hey, that rhymes!) ...
# subtract 16384 from the available memory $size
# why? the default 640x480 mode uses all but 16384, and when I set it
# to use more than that, it oopses (!). So... for safety's sake, and
# because you probably don't use those 15-25 lines anyway...
$size -= 16384;
print "# modes.fb - video mode descriptions for fbset
#
# See fbset(8) and fb.modes(5) for more information
";
$flag = 0;
# read all XF86Config files
while(<>) {
chomp;
next if !(($name, $clock, $xres, $xsyncstart, $xsyncend, $xfres,
$yres, $ysyncstart, $ysyncend, $yfres, $extra) =
/^\s*modeline\s+"([^"]+)"\s+([0-9.]+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s*(.*)$/i);
$flag = 1;
# timing transformations, as described in the fb HOWTO
$pixtime = int(1000000/$clock);
$left = $xfres - $xsyncend;
$right = $xsyncstart - $xres;
$hsynclen = $xsyncend - $xsyncstart;
$top = $yfres - $ysyncend;
$bottom = $ysyncstart - $yres;
$vsynclen = $ysyncend - $ysyncstart;
# pick a virtual X and Y resolution
$vxres = get_vxres($xres);
if ($vxres < 0) {
print STDERR "Could not guess a good virtual resolution for mode $name.\n";
print STDERR "Use the advanced options --rounding and --vxres.\n";
next;
}
$vyres = int($size/$vxres);
# print out our entry
print "mode \"$name\"\n";
print " geometry $xres $yres $vxres $vyres $depth\n";
print " timings $pixtime $left $right $top $bottom $hsynclen $vsynclen\n";
# handle extra options at the end of the modeline
$extra =~ tr/A-Z/a-z/;
@options = split/\s+/,$extra;
foreach (@options) {
if ($options_map{$_}) {
print " $options_map{$_}\n";
}
else {
print " # unknown option: $_\n";
}
}
print "endmode\n\n";
}
if (!$flag) {
print STDERR "No modelines found.\n";
print STDERR "Make sure the file you specified was an XF86Config file and\n";
print STDERR "used the single-line Modeline format.\n\n";
print STDERR "Use \"$0 --help\" for help.\n";
}
sub get_vxres {
foreach (@possible_vxres) {
return $_ if ($_ >= $_[0] && ($_ % $rounding) == 0);
}
return -1;
}
sub usage {
print STDERR "$_[0]\n" if ($_[0]);
print STDERR "$0 [OPTION] [FILES]\n\n";
print STDERR " -d,--depth depth use a certain display depth (default is 8)\n";
print STDERR " -h,--help what you see here\n\n";
print STDERR "Advanced options:\n";
print STDERR " -r,--rounding div vxres divisor (default is 128)\n";
print STDERR " -x,--vxres X,X,X,... extra possible vxres values\n\n";
print STDERR "[FILES] refers to one or more XF86Config files. Note that\n";
print STDERR "all modelines must be in single-line format.\n\n";
print STDERR "Example:\n";
print STDERR " $0 -d 16 /etc/X11/XF86Config\n";
exit 0;
}
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