[PD] [Gem] how to optimize alphablending?

Alexandre Quessy listes at sourcelibre.com
Sun Aug 28 18:43:38 CEST 2005

Hem, by the way,

Wouldn't we need a [pix_rgba] in the chain to make sure we can use 
[pix_alpha] on them ? I think this is useful when it's either GIF files 
or MPEGs. Am I right ?


Le 05-08-28, à 11:47, Roman Haefeli a écrit :

> hi
> i attached a patch, that is used to 'alphablend' from one to another
> picture. it is working though, but the cpu-load raises to 100% and it
> looks quite 'ruckelig' (not constantly flowing). i tried it on 
> different
> machines with the same result. then i tried it with a better gfx-card,
> that supports opengl (Quadro FX 330), on a P4 2.66GHz (winxp). it looks
> better, but my patch still uses 100% cpu.
> i'm quite a gem-newbie and don't know much about opengl, but i assume
> that my patch is not optimized and there is still much calculated by 
> cpu
> instead of gpu. last week i saw a screensaver-slideshow on an old 
> ibook,
> that looked very nice. this let me hope there is still a chance, that i
> can realize the same with Gem on hardware that is up-to-date.
> thanks for any help
> roman
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