[Fluxus] FreeFrame and Video Buffer

[Claude Heiland-Allen]

On 20/05/12 16:15, Kassen wrote:
> On Sun, May 20, 2012 at 04:23:33PM +0200, roger pibernat wrote:
>> oh, thanks a lot, Kas.
>>
>>
>>> This I don't know about, it's not something I think I heard of in the
>>> Fluxus context. For filtering and so on we do support GL shaders.
>>>
>> All I know is it's listed on the FreeFrame host apps listing:
>> http://community.freeframe.org/hostdatabase
>
> Then most likely that is right and I was wrong :-)
> It is a bit odd that I hadn't heard of it though.

Looks like there's some code built in, but I've personally not tried it 
(also I'm not sure if it works on 64bit, the freeframe spec seems 32bit):

http://git.savannah.gnu.org/cgit/fluxus.git/tree/modules/fluxus-engine/src/FFGLFunctions.cpp?h=master 



>
>>
>> I'm not sure I understand what you're suggesting.  Would that be writing
>> the output to a texture and then mapping it to the surface of a plane
>> rendered at full screen?  Are you saying I may have access to the texture
>> pixels?  If so that would work for me, I guess.  I don't need much
>> precision, rather the opposite, because all I want is to add glitches to
>> the images.
>>
> Yes, that is exactly what I was suggesting. Textures you can treat as
> just as set of pixels as well as link a renderer to them. The one
> downside to this and why I wonder whether this will suit your needs is
> that it is slow to do stuff per-pixel, per-frame and this will
> probably be a serious bottleneck if you'd like to do this full-screen
> in realtime.
>
> Maybe a shader could work for adding glitches, instead of this whole
> "plane+ texture+ tricks" stuff. Shaders have their own little language
> and I think they require reading a bit about OpenGL and so on, but if
> it would work it would be a LOT faster.

Yes if you have a recent (last 2-3 years) GPU you can probably 
manipulate HD video in real time with fragment shaders, depending of 
course on how complicated your processing is.

(
semi-off-topic, not fluxus, but opengl glsl shaders: these experiments 
from early this year were definitely not realtime even with a fast GPU:
http://claudiusmaximus.goto10.org/g/pencil-filter/
)

>> too bad fluxus is not the 'right' tool for that anyways, I was just getting
>> into it and I really like it.  But I'll be using it for other stuff for sure
>>
>
> Lovely; welcome on board!
>
> Yours,
> Kas.


Claude