[Interest] 60FPS and FBO

[Florian Boucault]

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

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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