[maemo-developers] Clutter in Fremantle (Alpha SDK)

[From: Duncan Cragg]

Gary:

I, too, am trying to get my OpenGL ES 2.0 application to work nicely 
within the Maemo environment.

I'm currently testing by killing off the window manager and other 
related stuff - back to the old X11 wallpaper pattern, then running my 
app. Works fine, as it goes.

I knew I'd have to come up with a solution one day, but since the 
conversation on this list recently (below), I thought I'd take this 
opportunity to probe a little deeper.

 > I'm getting round this by designing my framework to allow both
 > standalone unshared instances to be run (multiple XV overlays
 > are allowed) and I have also put the core principles in place for
 > dynamically loading shared application widgets into the playground.

Fact is, I don't understand this, and was hoping you'd elaborate... =0)

--------------

Does anyone else on the list know the Official Maemo Way to develop 
OpenGL ES 2.0 applications?

My approach is that I just run the PowerVR SDK in the X86 mode.  I 
notice that the lib/.h files have now arrived for cross-compiling to ARM. 

By the way, it's amazing how many levels and layers you can go through. 
In case anyone else is put off trying it: I run in X86 SDK mode to the 
PVR ES 2.0 emulation lib, which presumably uses the X86 SDK's GL 
libraries and then goes to the Xephyr X11 app. This then runs into my 
Ubuntu's X11, which is created by VMWare inside Windows XP inside a 
laptop with Intel Graphics chips.  (So I'm not expecting great 
performance!  But it works fine for testing. =0)  I get "direct 
rendering: Yes" from glxinfo inside my VMWare guest, so there's a slight 
chance that there is some acceleration going on somewhere in the pipes...

Anyone else got experiences to report?

Perhaps we should start a wiki page somewhere to give the official 
instructions for GL app devs, and to document successes and failures 
like this?


Cheers!

Duncan Cragg

-- 
*Q:* /What's The Killer App for Mobile 2.0?/
*A:* See http://the-u-web.org



Subject:
Re: Clutter in Fremantle (Alpha SDK)
From:
gary liquid <liquid at gmail.com>
Date:
Tue, 17 Mar 2009 09:28:34 +0000

To:
Henrik Hedberg <henrik.hedberg at innologies.fi>
CC:
maemo-developers at maemo.org


Hendrik,

I assume that to use clutter in your application is to somehow get the 
window manager to shutdown the opengl context and then open yours for 
the duration before once again reopening the window manager.

A somewhat challenging prospect!

Whilst its possible to use x11 compositing to bring in a gtk or qt 
window, I assume there is no extension to composite an opengl window itself.

And since its "difficult" to allow sharing of data between applications 
this is not something that could be fixed elegently.

really makes you appreciate the underlying beauty of x11 :)

I'm getting round this by designing my framework to allow both 
standalone unshared instances to be run (multiple XV overlays are 
allowed) and I have also put the core principles in place for 
dynamically loading shared application widgets into the playground.

It should be as simple as a change in the makefile to switch a properly 
designed application between standalone or shared :)

gary


On Tue, Mar 17, 2009 at 7:37 AM, Henrik Hedberg 
<henrik.hedberg at innologies.fi <mailto:henrik.hedberg at innologies.fi>> wrote:


       Hi,

       How is Clutter supposed to work in applications in Fremantle? Will
    the Clutter-GTK library be included in the final SDK?

       I have tried to run a Clutter application that works in desktop
    environment. It compiles fine, but nothing happens when starting it in
    the Alpha SDK. Also, even the simplest example application from
    Programming with Clutter tutorial does not work [1].

       Is this somehow related to this statement: "It is assumed that we
    will have only one OpenGL drawing context, and thus a single process
    running in the system will be using Clutter at a time. This process will
    be the window manager and the implementor of all challenging graphical
    UI effects on the screen." [2]

       What is the trick to get a working Clutter stage in Fremantle
    application?

       BR,

       Henrik

    [1]
    http://www.openismus.com/documents/clutter_tutorial/0.8/docs/tutorial/html/sec-stage.html#sec-stage-basics
    [2] http://maemo.org/development/sdks/maemo5_alpha_overview/

    --
       Henrik Hedberg  -  http://www.henrikhedberg.net/

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