Re: OpenGL Overlay visuals in X11
Re: OpenGL Overlay visuals in X11
- Subject: Re: OpenGL Overlay visuals in X11
- From: Stanko Juzbasic <email@hidden>
- Date: Mon, 11 Aug 2003 20:48:41 +0200
- Resent-date: Tue, 12 Aug 2003 10:13:35 -0700
- Resent-from: email@hidden
- Resent-message-id: <email@hidden>
- Resent-to: email@hidden
Thanks for the mail. You're prtobably right about your trade. I, as
composer (and whole lot of people who deal with interactive
visualization) develop interactive audio-visualization
analysis/resynthesis educational applications (in collaboration with
Columbia University Computer Music Center - my former Fulbright host
institution). In such tasks, availability of overlay visuals is an
absolute measurment of comfort. User input plane has to be one level
higher than RGB visualization, in order to avoid processor expensive
redraws. On the other hand, it is advisable to use as much screen as
possible. Furthermore, i believe it would be a pity to disconcern
overlays in a system where hardware alows for it. After all, my mission
lies in hope that someone would realize the importance of building-in
overlay capability to Apple's X Server. Even such ubiquitous
visualisation apps like OpenDX need it.
I have also no idea about what you wrote regarding "direction" or
redirection. I'm not that expert in communicating mail to users' groups.
Did you mean that I should CC the mail to the users group?
Of course I would do it with your consent.
Thanks again.
Greetings,
Stanko
Sean Ahern wrote:
>Stanko Juzbasic wrote:
>
>
>>I would not agree with you in saying they are nota requirement. Most
>>interesting programs at launch time search for available visuals, require
>>overlays, and won't even launch without overlay visuals found. I would say
>>overlay support is a central feature of any graphic visualization subsystem
>>and is what makes a difference between a children's toy and a workstation.
>>
>>
>
>Hm. I disagree. I'm a researcher at a National Laboratory here in the
>States. We do terascale visualization on clusters and other systems every
>day. We have many visualization applications that do not require overlay
>planes to be supported in a graphics subsystem. For instance, let's say that
>you have allocated those planes to additional precision in the color or depth
>buffer. If you aren't planning on rendering GUI elements over the OpenGL
>area, you really don't need to rely on overlay planes, and it makes more sense
>to use the frame buffer resources for other uses.
>
>The reason I say that they are not a requirement is that, at worst, you incur
>an additional frame of rendering. In general, that doesn't make your app
>impossible to use. It merely adds a delay, albiet undesirable. Overlay
>planes are very useful, but certainly not a requirement to make a usable
>visualization application.
>
>
>
>>>[Re:] I was merely trying to find a more detailed description of what,
>>>specifically, you found lacking in Apple's GLX.
>>>
>>>
>>How are you connected with the Apple's GLX? Are you the author?
>>
>>
>
>No. I am not affiliated with Apple in any way. I am only connected in that I
>am a user of Apple's X11 and try to follow its development closely. Systemic
>problems like lack of overlay planes or problems with X11 event delivery
>concern me as a software developer of visualization systems.
>
>(I'm a bit surprised that you redirected this conversation to private email
>rather than the x11-users list, as there are others on the list who might be
>interested in commenting.)
>
>-Sean
>
>__
>email@hidden
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