[Interest] 60FPS and FBO

[Thomas Senyk]

On Mon, November 26, 2012 17:42:18 Florian Boucault wrote:
> Hi Thomas,
> 
> I have noticed similar issues on Linux based systems. I use the
> following environment variables that fixes the issue for me:
> 
> QML_FORCE_THREADED_RENDERER=1

Hm right ... I knew about it, but I've rarely used it.
I should, thx for the reminder :)

> 
> Florian
> 
> On 26/11/12 16:50, Thomas Senyk wrote:
> > Hi,
> > 
> > the context of this is mail is:
> >  - scenegraph
> >  - FBO based effects
> >  (plain shader-effects, qtgraphicaleffects, qt3d)
> >  - embedded hardware / opengl es 2.0
> > 
> > I've noticed that on a lot of embedded systems the FPS drops rather
> > drastically (e.g. from 60 to 30 with one effect, from 30 to 10-15 with two
> > effects) when using FBO based effects.
> > 
> >   ... even simple effects, sometimes even if they have 'visible: false'
> > 
> > Is this somewhat expected?
> > It does sound like a vsync vs. fbo problem ... doesn't it?
> > Is this a fault/bug in the embedded opengl drivers?
> > 
> > Did anyone ever had a setup, using one or multiple FBO based effects did
> > still result in 60fps? (as it should be for simple(!) effects?)
> > 
> > 
> > 
> > This mail is 'vague' on purpose, I don't want to start a concrete
> > technical
> > discussion ... I rather want to ask for opinion and experience.
> > 
> > 
> > Greets
> > Thomas
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