[PD] Blending mode directly on objects, not pixes?

[Matteo Sisti Sette]

IOhannes m zmölnig escribió:

> yep. you should be able to control this on low level with
> [GEMglBlendFunc]

It seems I must first enable blending using glEnable, that is, I guess, 
[GEMglEnable]

Having a look at this link 
http://pyopengl.sourceforge.net/documentation/manual/glEnable.3G.html
(there are probably better resources but I found this one with google),
I understand I have to send it (through the right inlet I guess) a value 
that corresponds to the constant GL_BLEND, which is the "capability" I 
need to enable.

Now the question is (and it extends to all [GEMglAnything] objects): how 
do I pass these constant values? I guess I cannot use symbolic names, 
can i? If not, then I need to figure out the corresponding numeric 
value??? Where do I find them? (they are usually intentionally not 
disclosed in most documentation...)


Another question: once I figure out how to enable blending and set the 
proper blending function, will I be able to enable it "under" a 
[gemframebuffer] only? (that is, so that things that are under that 
gemframebuffer are rendered using a blend function while chains 
"outside" the gemframebuffer, rendered directly to the gemwin, are 
rendered in the standard non-blending fashion)


Thanks
m.


-- 
Matteo Sisti Sette
matteosistisette at gmail.com
http://www.matteosistisette.com