My Chromium Installation

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Because I include my autodmx.conf file, which is based of the autodmx.conf file included in the Chromium distribution. I include the license it is covered under.

I use Chromium to add OpenGL support to my Xdmx display wall. I thought I would post a few things I did to make it work. This is a copy of the autodmx.conf file that I used

# Copyright (c) 2001, Stanford University
# All rights reserved
#
# See the file LICENSE.txt for information on redistributing this software.

#
# This configuration file is meant to be used with DMX.
# When everything's set up correctly, you can just type type name of your
# OpenGL app and Chromium will work automatically on your DMX display.
# This is far nicer than manually starting crservers!
#
# Prerequisites:
#  1. Your ~/.crconfigs file needs to be setup.  Specifically, it needs a
#     line like this:
#        *  /usr/local/Chromium/cr/mothership/configs/autodmx.conf %m %p
#     This tells Chromium's libcrfaker to use the autodmx.conf config file
#     when running any application (indicated by *).  The %m is replaced by
#     a random mothership port.  The %p is replaced by the program name.
#
#  2. libGL.so and libGL.so.1 must be symlink to libcrfaker.so
#
#  3. The back-end/cluster machines must have the crserver binary in the
#     search path (typically /usr/local/bin or /usr/bin) and a properly
#     set LD_LIBRARY_PATH (you can tweak it below).
#
#  4. rsh to the back-end/cluster machines must work.
#
# How it works:
#  1. When the app starts, libcrfaker will fail to find the mothership on
#     its first try.  That'll signal it to search the .crconfigs file for
#     a mothership config to spawn.  libcrfaker will choose a random port
#     number for the mothership.
#
#  2. The mothership is spawned with autodmx.conf.  In turn, it uses rsh
#     to start up the crservers on the back-end machines.  Another random
#     port number is used for the crservers.
#
#  3. Control returns to libcrfaker where it proceeds to load the client-side
#     SPU chain (tilesort).  Then, control returns to the application.
#
# Notes:
#  1. We use random port numbers (within a reasonable range) so that multiple
#     GL apps can use DMX/Chromium simultaneously.  If we don't use random
#     numbers we'd need some sort of port broker (complicated).
#
#  2. You will need to tweak 'crdir' here:

# Change this line to the location of your Chromium installation.
#crdir = "/home/sourceforge/Chromium-dmx/cr"
#crdir = "/g/g16/ahern/work/Chromium/trunk/cr"
crdir = "/opt/cr"

import random
import sys
#from random import *
sys.path.append( crdir + "/mothership/server" )
from mothership import *

if len(sys.argv) < 3:
	print "Chromium mothership error: no program specified to run!"
	sys.exit(1)

mothershipPort = int(sys.argv[1])
program = sys.argv[2]

cr = CR()
cr.MTU( 10*1024*1024 )

# Call dmx_config to get information about the DMX tile layout.
import os
dmx = os.popen("%s/dmx_config 2>/dev/null"%crbindir).read()
if not dmx:
    print "Chromium mothership error: Chromium does not appear to have"
    print "Chromium mothership error: been compiled with DMX support."
    sys.exit(1)
dmx = eval(dmx)
if not dmx:
    print "Chromium mothership error: DMX does not appear to be running."
    sys.exit(1)

localHostname = os.uname()[1]

# choose random port for server communication
serverPort = random.randint(7000, 7100)

AUTOSTART = 1


# These values don't really matter!
TILE_WIDTH = 550
TILE_HEIGHT = 550

tilesortspu = SPU('tilesort')
tilesortspu.Conf('use_dmx', 1)
tilesortspu.Conf('retile_on_resize', 1)  # the default
tilesortspu.Conf('bucket_mode', 'Non-Uniform Grid')

clientnode = CRApplicationNode( )
clientnode.SetApplication( program )
clientnode.AddSPU( tilesortspu )
clientnode.Conf('track_window_size', 1)
clientnode.Conf('track_window_position', 1)

itr=0
alpha=0
for tile in dmx:
    renderspu = SPU( 'render' )

    host = tile['display'].split(':')[0]
    dsp = tile['display'].split(':')[1]
    renderspu.Conf('display_string', tile['display'])
    renderspu.Conf('render_to_app_window', 1)

    servernode = CRNetworkNode( host )
    servernode.AddTile( 0, 0, tile['width'], tile['height'])
    servernode.AddSPU( renderspu )

    # optimize_bucket is of no use w/ DMX.
    servernode.Conf('optimize_bucket', 0)
    servernode.Conf('use_dmx', 1)
    cr.AddNode( servernode )

    if AUTOSTART:
	servernode.AutoStart( ["/usr/bin/ssh", host, "/bin/sh -c 'DISPLAY=:%s  LD_LIBRARY_PATH=%s %s/crserver -mothership %s:%d'" % (dsp, crlibdir, crbindir, localHostname, mothershipPort) ] )


    tilesortspu.AddServer( servernode, protocol='tcpip', port=serverPort+itr)
    itr=itr+1


cr.AddNode( clientnode )
cr.Go( mothershipPort )

I made two primary changes, first I altered the way the script got the value for DISPLAY used for servernode.AutoStart, this is because I have one server node that has two screens (0.0 and 0.1). The standard config file wouldn't work with grids for which some hosts had two screens on a display. My version should work for any type of DMX configuration (any number of screens on any number of hosts in any configurations). Secondly, I changed it so that it would use ssh rather than rsh.

I followed the instructions in the Chromium Documentation to setup auto-start and auto-config with Xdmx. One thing I had to do was set LD_PRELOAD to the symlink to my libcrfaker.so in order to get it to work with middle-ware packages. Just following the instructions got my Chromium installation working with programs that used libGL directly, but I had to setup LD_PRELOAD to get programs that used middlware (such as crystalspace and ogre) to work with Chromium.

James Supancic