Re: Re: OpenGL and Plasma::Wallpaper
On Saturday 31 December 2011 12:10:37 Shaun Reich wrote: On Sat, Dec 31, 2011 at 5:17 AM, Martin Gräßlin mgraess...@kde.org wrote: On Thursday 29 December 2011 11:21:36 Justin L. Boss wrote: Personally I am not a big fan of having animations which would require OpenGL in the background. Most of the time the background is not visible, it requires resources and puts load on the compositor which has to update the scene although nothing changes (full repaints are most expensive). May I ask why you want to use OpenGL? Probably because QPainter is dog slow. using OpenGL doesn't make it faster if you need QPainter to render to the background ;-) Also, I don't think you should be against OGL wallpapers, considering some really sweet/impressive things could be done with them which could really make KDE stand out. e.g. a wallpaper playing a moving OGL scene, movies, virus wallpaper (which is currently a large CPU drain, and has no HW accel afik). Take Win 7 for instance, how they have Dreamscene™ or whatever. I divide the world into two categories: good for KWin, bad for KWin. An animated wallpaper is bad for KWin as it needs to update everything all the time. In that sense it does not matter whether the wallpaper uses OpenGL or something else. If it is animated than it is bad. This is of course orthogonal to what it provides: being awesome. KWin has also the being awesome things which are in fact bad for KWin. But what's the difference? Nobody tries to use the desktop while the cube is spinning. It just doesn't matter that KWin is using lots of resources. In case of a wallpaper covered by windows it does matter whether the background makes everything slow or not. So here I just think we should not give users the tool to make the desktop unbearable slow. Yes it looks awesome, yes new users might love it. Yes new users will switch back to whatever they used, because everything is extremely slow. So unless our wallpapers learn to not redraw the areas which are not visible anyway (which is probably impossible to know for the wallpaper), I am not a fan of animated wallpapers in general. Just for the record: using always animated wallpapers should perform better thanks to optimizations in 4.8. Cheers Martin signature.asc Description: This is a digitally signed message part. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: Re: OpenGL and Plasma::Wallpaper
On Sun, Jan 1, 2012 at 12:54 PM, Martin Gräßlin mgraess...@kde.org wrote: On Saturday 31 December 2011 12:10:37 Shaun Reich wrote: On Sat, Dec 31, 2011 at 5:17 AM, Martin Gräßlin mgraess...@kde.org wrote: On Thursday 29 December 2011 11:21:36 Justin L. Boss wrote: Personally I am not a big fan of having animations which would require OpenGL in the background. Most of the time the background is not visible, it requires resources and puts load on the compositor which has to update the scene although nothing changes (full repaints are most expensive). May I ask why you want to use OpenGL? Probably because QPainter is dog slow. using OpenGL doesn't make it faster if you need QPainter to render to the background ;-) Aaw, I was hoping using OGL/qml and what not would remove the need to go through QPainter at all. If only... So unless our wallpapers learn to not redraw the areas which are not visible anyway (which is probably impossible to know for the wallpaper), I am not a fan of animated wallpapers in general. Just for the record: using always animated wallpapers should perform better thanks to optimizations in 4.8. Cools. -- Shaun Reich, KDE Software Developer (kde.org) ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: Re: Re: OpenGL and Plasma::Wallpaper
On Sunday 01 January 2012 13:37:45 Shaun Reich wrote: On Sun, Jan 1, 2012 at 12:54 PM, Martin Gräßlin mgraess...@kde.org wrote: On Saturday 31 December 2011 12:10:37 Shaun Reich wrote: On Sat, Dec 31, 2011 at 5:17 AM, Martin Gräßlin mgraess...@kde.org wrote: On Thursday 29 December 2011 11:21:36 Justin L. Boss wrote: Personally I am not a big fan of having animations which would require OpenGL in the background. Most of the time the background is not visible, it requires resources and puts load on the compositor which has to update the scene although nothing changes (full repaints are most expensive). May I ask why you want to use OpenGL? Probably because QPainter is dog slow. using OpenGL doesn't make it faster if you need QPainter to render to the background ;-) Aaw, I was hoping using OGL/qml and what not would remove the need to go through QPainter at all. If only... it will with QML2 and the OpenGL SceneGraph :-) signature.asc Description: This is a digitally signed message part. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
OpenGL and Plasma::Wallpaper
Is there a way to use opengl in a Plasma::Wallpaper. Maybe by passing a opengl surface to QPainter then having Plasma::Wallpaper display it or does the Plasma::Wallpaper except opengl calls? Thanks for your thoughts. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: OpenGL and Plasma::Wallpaper
On Thursday 29 December 2011 11:21:36 Justin L. Boss wrote: Is there a way to use opengl in a Plasma::Wallpaper. Maybe by passing a opengl surface to QPainter then having Plasma::Wallpaper display it or does the Plasma::Wallpaper except opengl calls? You could do the same as the GLApplet [1] does: paint to a PBO or FBO, convert it to QImage and render the image. But this looks like a memory intensive operation and probably not a good idea. My recommendation would be to wait till we have QML 2 where everything is done in OpenGL :-) Personally I am not a big fan of having animations which would require OpenGL in the background. Most of the time the background is not visible, it requires resources and puts load on the compositor which has to update the scene although nothing changes (full repaints are most expensive). May I ask why you want to use OpenGL? Cheers Martin [1] https://projects.kde.org/projects/kde/kdelibs/repository/revisions/master/entry/plasma/glapplet.cpp signature.asc Description: This is a digitally signed message part. ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
Re: OpenGL and Plasma::Wallpaper
On Sat, Dec 31, 2011 at 5:17 AM, Martin Gräßlin mgraess...@kde.org wrote: On Thursday 29 December 2011 11:21:36 Justin L. Boss wrote: Personally I am not a big fan of having animations which would require OpenGL in the background. Most of the time the background is not visible, it requires resources and puts load on the compositor which has to update the scene although nothing changes (full repaints are most expensive). May I ask why you want to use OpenGL? Probably because QPainter is dog slow. Also, I don't think you should be against OGL wallpapers, considering some really sweet/impressive things could be done with them which could really make KDE stand out. e.g. a wallpaper playing a moving OGL scene, movies, virus wallpaper (which is currently a large CPU drain, and has no HW accel afik). Take Win 7 for instance, how they have Dreamscene™ or whatever. Having features like this is similar to having neat and incredibly useless OGL window animations (e.g. cube), ergo...everybody wants them, haha ;) -- Shaun Reich, KDE Software Developer (kde.org) ___ Plasma-devel mailing list Plasma-devel@kde.org https://mail.kde.org/mailman/listinfo/plasma-devel
