I'm very sorry for not including the version. If I had, I might have realized I 
wasn't building with version I thought I was.

I found I was building with VirtualGL-2.4.80.x86_64 (not certain where I 
originally found that tar). The official binary I was testing is 
VirtualGL-2.4.1.x86_64.rpm. I picked up the correct source for 
VirtualGL-2.4.1.x86_64 and compiled that. With the new source, I do not receive 
the '-c proxy' error any more. So egg on my face...

To answer your question, yes. Previously, when I was building the incorrect 
version, '-c proxy' failed on Cygwin but not with TurboVNC.

Even now with 2.4.1, Cygwin '-c proxy' still performs better than '-c jpeg' or 
'-c rgb'. With TurboVNC, I cannot tell the difference between any of the 
compression types -- they all seem very fluid.

Perhaps, I've setup something incorrectly with Cygwin\X. I will re-investigate 
that, and re-read the documentation.

Once again, sorry for my inaccuracy & false alarm.

-----Original Message-----
From: DRC [mailto:dcomman...@users.sourceforge.net] 
Sent: Thursday, September 03, 2015 3:58 PM
To: virtualgl-users@lists.sourceforge.net
Subject: Re: [VirtualGL-Users] ERROR: in FBX -- XCopyArea symbol not loaded

Which version of VirtualGL?  That is literally the most important detail to 
include in any bug report.

Also, if you're observing that '-c proxy' performs better than the default '-c 
jpeg', then something is terribly wrong.  "Proxy mode" is intended for X 
proxies, e.g. TurboVNC.  It sends the images uncompressed through the X11 
protocol, which means that, even on gigabit, the most you'll see is 30 
Megapixels/sec (JPEG can easily achieve twice that on a
100 Mbit network.)

Also, just to clarify, '-c proxy' fails only with Cygwin but works with 
TurboVNC?  Definitely something amiss there as well.  You're going to need to 
provide a lot more details before I can even begin to figure out what's going 
on.


On 9/3/15 2:28 PM, Michael Mirsky wrote:
> Hello,
>
> I’m new to VirtualGL and I’ve been testing it with my Qt5 app. For the 
> most part, it works flawlessly! However, I have run into one issue.
> Specifically, my build of VirtualGL fails with the following error if 
> I try to launch my app with the “-c proxy” compression option:
>
> [VGL] ERROR: in FBX—
>
> [VGL]         510: [FBX] ERROR: XCopyArea symbol not loaded
>
> Any ideas of what this error means or what I might have missed during 
> compilation? Running with “-c rgb” or the default works.
>
> I first tested with the “official” VirtualGL binary package, and 
> vglrun with the “-c proxy” option performs with the least lag. Thus, 
> it would be nice to combine that with the xcb interposer so that resize works.
>
> As some background, my VirtualGL server is running on Linux (RHEL6) 
> and my client is Windows with Cygwin\X. I’ve tested using TurboVNC and 
> that works great, but I’d prefer to get Cygwin\X to work if possible.

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