Multiple X session windows

SDL Development
1

I want to use SDL to open multiple windows on multiple X servers - basically I want to use SDL to control one
screen and at the same time have windows open on a remote X server. My feeling is the SDL interface is fundamentally limited in this respect and that the only way to do it would be to run a client server model for one of the displays so that I could have two SDL sessions running in two applications but I’d prefer to avoid this.

Does anyone know if it is possible to do this via SDL?

Cheers,

SA_________________________________________________________________
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2

2009/8/25 not disclosed

I want to use SDL to open multiple windows on multiple X servers -
basically I want to use SDL to control one
screen and at the same time have windows open on a remote X server. My
feeling is the SDL interface is fundamentally limited in this respect and
that the only way to do it would be to run a client server model for one of
the displays so that I could have two SDL sessions running in two
applications but I’d prefer to avoid this.

Does anyone know if it is possible to do this via SDL?

capture the screen area of the server running a graphical x term convert
thet into a mpeg stream then stream that to the machine you want to use and
decode with ffmpeg into a sdl window under that window have a sdl text input
window which then sends commands via text file and ftp to the server
computer which cron jobs every 15 seconds to check if a file has been
updated if it has it reads the file into the xterm on the server screen.

3

2009/8/26 Neil White

2009/8/25 not disclosed

I want to use SDL to open multiple windows on multiple X servers -
basically I want to use SDL to control one
screen and at the same time have windows open on a remote X server. My
feeling is the SDL interface is fundamentally limited in this respect and
that the only way to do it would be to run a client server model for one of
the displays so that I could have two SDL sessions running in two
applications but I’d prefer to avoid this.

Does anyone know if it is possible to do this via SDL?

capture the screen area of the server running a graphical x term convert
thet into a mpeg stream then stream that to the machine you want to use and
decode with ffmpeg into a sdl window under that window have a sdl text input
window which then sends commands via text file and ftp to the server
computer which cron jobs every 15 seconds to check if a file has been
updated if it has it reads the file into the xterm on the server screen.

sorry i am such a troll, feel free to come to ircnet #trolls and kick ban me

4

Is this such a dumb question? two different windows on two different X servers?Date: Wed, 26 Aug 2009 00:09:58 +0100
From: neil@cloudsprinter.com
To: sdl at lists.libsdl.org
Subject: Re: [SDL] Multiple X session windows

2009/8/26 Neil White

2009/8/25 not disclosed <@not_disclosed>

I want to use SDL to open multiple windows on multiple X servers - basically I want to use SDL to control one
screen and at the same time have windows open on a remote X server. My feeling is the SDL interface is fundamentally limited in this respect and that the only way to do it would be to run a client server model for one of the displays so that I could have two SDL sessions running in two applications but I’d prefer to avoid this.

Does anyone know if it is possible to do this via SDL?

capture the screen area of the server running a graphical x term convert thet into a mpeg stream then stream that to the machine you want to use and decode with ffmpeg into a sdl window under that window have a sdl text input window which then sends commands via text file and ftp to the server computer which cron jobs every 15 seconds to check if a file has been updated if it has it reads the file into the xterm on the server screen.

sorry i am such a troll, feel free to come to ircnet #trolls and kick ban me

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5

2009/8/26 not disclosed

Is this such a dumb question? two different windows on two different X
servers?

dunno :wink: i’m sure people ask and want the same sort of thing all the time on
here, but sdl simply dosnt do this sort of thing, the s stands for simple,
so the general plan is to keep it so i guess.

6

I want to use SDL to open multiple windows on multiple X servers - basically
I want to use SDL to control one
screen and at the same time have windows open on a remote X server.
Can you describe the setup a bit more? When you say remote, do you
mean separate machines separated by nondeterministic connection
(something like udp)? If so, I think client-server may be the best
fit, and may be simpler than you think–just setup one machine to
broadcast SDL_Events, and the other machine to sit and receive them.
I’ve done this with some success in order to build a video wall using
SDL+OpenGL and it was actually easier than I expected. Even if the
apps are on the same physical machine, the socket approach will
generalize.

Check out the event package here:
http://code.google.com/p/xor/source/browse/#svn/trunk/src/event
and the folders for mouse/keyboard/timer/etc if you want to see how I
implemented it.

Does anyone know if it is possible to do this via SDL?
I think SDL 1.3 supports multiple windows out of the box, I would
check the latest version from the repository.

JohnOn Tue, Aug 25, 2009 at 5:29 PM, not disclosed wrote:

7

John,

What I need is simpler I think–

I need an GUI on my PC (linux) to control a video projector connected to another computer (beagleboard).
As things stand I run my application on the BB and drive the projector using SDL via X11. I only need
to blit static images to the projector (but wanted another window exported to X11 on my host PC for the GUI).

Under X the create window function (can’t remember exactly) takes a display argument so each window
could in theory go to a different X-server but under SDL I think I am tied to one display because SDL_init
and the underlying library assumes just one display.

My plan was to make a simple screen server for the projecter on the BB and run an application on the BB
to produce a GUI that I could export to my PC. I already have a simple server for this running over TCP.

As things stand the BB is too slow to do the processing I need to do (almost exactly 100 times slower than
my PC for the intensive bit of code) so I am changing plans for the time being and running the gui + processing
on the PC and accessing the display via my simple TCP server (and therefore each SDL app now only
needs to talk to one display).

My next problem is I need to coordinate the output to the projector to the screen refresh rate so I can
change the output exactly in time with the refresh but I am not sure how to make SDL do this (or how
to get SDL to let me know the vertical blanking interval has passed so I can render and requeue SDL_flip()).
This is where it will likely get a bit complex and I’ll have to stick part of the processing back on the BB
and invert the client-server model to make the GUI a server and the application on the BB driving the
projector the client…

It has all got a bit complex and I think (in the end) I’ll retreat to a test based UI over ssh…

Cheers,

SA> Date: Wed, 26 Aug 2009 07:37:13 -0500

From: john.magnotti at gmail.com
To: sdl at lists.libsdl.org
Subject: Re: [SDL] Multiple X session windows

On Tue, Aug 25, 2009 at 5:29 PM, not disclosed<@not_disclosed> wrote:

I want to use SDL to open multiple windows on multiple X servers - basically
I want to use SDL to control one
screen and at the same time have windows open on a remote X server.
Can you describe the setup a bit more? When you say remote, do you
mean separate machines separated by nondeterministic connection
(something like udp)? If so, I think client-server may be the best
fit, and may be simpler than you think–just setup one machine to
broadcast SDL_Events, and the other machine to sit and receive them.
I’ve done this with some success in order to build a video wall using
SDL+OpenGL and it was actually easier than I expected. Even if the
apps are on the same physical machine, the socket approach will
generalize.

Check out the event package here:
http://code.google.com/p/xor/source/browse/#svn/trunk/src/event
and the folders for mouse/keyboard/timer/etc if you want to see how I
implemented it.

Does anyone know if it is possible to do this via SDL?
I think SDL 1.3 supports multiple windows out of the box, I would
check the latest version from the repository.

John

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