RE: 答复: merge with qt.git#4.8

[thomas.senyk at nokia.com]

Hi Lingfang,

yes and no :)

First of all it's important to understand what you want. You got basically two option:
- QWidget application
- QGraphicsView (which covers QtQuick applications.)


If you're doing QWidget applications in 90% of all cases (just a personal estimation based on experience) you don't want to have OpenGL acceleration because:
- It's experimental and it's not bug free.
- The performance is not very good. QWidget were never meant to be HW accelerated and because of various reasons they tent to consume much more performance as one would expect.
- Because of the last reason I would expect that opengl-accelerated QWidget application consume much more battery then non-accelerated.
- On android you got limitation regarding top-level. This is mainly things like DropBox-Menu, MessagesBox and such things. I would expect that you can work around most of the limitations.
- If you have OpenGL, you also want fancy animations (moving, scaling, transparency,...) and QWidgets only have very limited capabilities there.

If non of those things concern you and you think you can work around the few QWidgets which require there own top-level you can go ahead and try it, but consider yourself warned :)

Or in other words:
If you're doing QWidget applications and you feel the need to have opengl-acceleration because of performance, you probable should have done the application using QtQuick (or QGraphicsView if you don't like js/declarative)


Greets
Thomas



________________________________________
From: ext Li, LingFang [lfli at telenav.cn]
Sent: Monday, July 11, 2011 7:43 AM
To: BogDan
Cc: necessitas-devel at kde.org
Subject: 答复: 答复: merge with qt.git#4.8

Is there anybody working on the composite manager?

You said currently OpenGL supports only a single top level window.
Then in this top level window, can we add several child widget to it? Such as buttons, images, etc, and all these child widgets are rendered with OpenGL.

Best Regards
Lingfang

发件人: BogDan [mailto:bog_dan_ro at yahoo.com]
发送时间: 2011年7月7日 14:41
收件人: Li, LingFang
抄送: necessitas-devel at kde.org
主题: Re: 答复: merge with qt.git#4.8

Hi,

I tested experimental-eglfs, commit 11dc6ce9cd858a3f6d91c8339edef14d64d4c007
OpenGL supports only a single top level window ! It needs a client side composite manager
to be able to render multiple top level widgets.

Cheers,
BogDan.


________________________________
From: "Li, LingFang" <lfli at telenav.cn>
To: BogDan <bog_dan_ro at yahoo.com>
Cc: "necessitas-devel at kde.org" <necessitas-devel at kde.org>
Sent: Thursday, July 7, 2011 4:45 AM
Subject: 答复: merge with qt.git#4.8

Hi, BogDan
Which branch did you test?  Experimental-eglfs or experimental-eglfs-jw?
And works fine means the OpenGL example supplied by QT will run properly, right?

-----邮件原件-----
发件人: BogDan [mailto:bog_dan_ro at yahoo.com<mailto:bog_dan_ro at yahoo.com>]
发送时间: 2011年7月6日 22:05
收件人: Thomas Senyk
抄送: necessitas-devel at kde.org<mailto:necessitas-devel at kde.org>
主题: Re: merge with qt.git#4.8

Is up to you :)

BTW I tested OpenGL on android-5 (android 2.1) and
android-8 (android 2.2.1) and works fine ! I think next release
will rock !

Cheers,
BogDan.


----- Original Message -----
> From: Thomas Senyk <thomas.senyk at nokia.com<mailto:thomas.senyk at nokia.com>>
> To: BogDan <bog_dan_ro at yahoo.com<mailto:bog_dan_ro at yahoo.com>>
> Cc: "necessitas-devel at kde.org<mailto:necessitas-devel at kde.org>" <necessitas-devel at kde.org<mailto:necessitas-devel at kde.org>>
> Sent: Wednesday, July 6, 2011 4:56 PM
> Subject: Re: merge with qt.git#4.8
>
> Hehe :) I'm merging down-stream :)
>
> merging order:
> 1. 4.8 into experimental
> 2. experimental into experiemental-ro
> 3. experiemental-ro into experimantal
>
>
> I'm not sure if it's wise to do it, but I already did 1.
> 2. should be painless ... I hope ;)
> 3. is definitly painless ... I hope
>
> Greets
> Thomas
>
>
> On Wednesday, July 06, 2011 03:43:24 PM ext BogDan wrote:
>>  Great !
>>  I want to do it, but you start to merge egl with experimental :)
>>  Are you sure you don't want to wait until the merge is finished ?
>>
>>  Cheers,
>>  BogDan.
>>
>>
>>  ----- Original Message -----
>>
>>  > From: Thomas Senyk <thomas.senyk at nokia.com<mailto:thomas.senyk at nokia.com>>
>>  > To: necessitas-devel at kde.org<mailto:necessitas-devel at kde.org>
>>  > Cc:
>>  > Sent: Wednesday, July 6, 2011 4:34 PM
>>  > Subject: merge with qt.git#4.8
>>  >
>>  > Nobody has pulled from qt4.8 since may as far as I see it.
>>  >
>>  > So I did a merge with qt.git#4.8 ... I'm not 100% sure if
> everything went
>>  > well
>>  > but it looks good :)
>>  >
>>  > I think I will push it, and if it's really broken we can fix it
>>  > afterwards. Better fixing it afterwards then never merging with qt4.8
>>  > again :)
>>  >
>>  > Greets
>>  > Thomas
>>  > _______________________________________________
>>  > Necessitas-devel mailing list
>>  > Necessitas-devel at kde.org<mailto:Necessitas-devel at kde.org>
>>  > https://mail.kde.org/mailman/listinfo/necessitas-devel <https://mail.kde.org/mailman/listinfo/necessitas-devel%0a>
>
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