[PD] Gem: Using 2 glsl_program objects ?

[Alexandre Quessy]

Hi,

2007/11/25, vade <doktorp at mac.com>:
> I agree, this should be possible in theory. I suspect one should be
> able to build an abstraction that would dynamically load a shader
> program, render to a quad, send that quad to a texture and output the
> texture.
>
> This is basically all jit.gl.slab does for stream processing.

What do you mean by a "quad" ? You mean to render it to a texture ?
This would need to use something like pix_snap2tex ? (capturing the
whole window render)

a











>
> I still have heard nothing on the multitexture issue for GLSL however,
> so there may be some gotchas.
>
> On Nov 25, 2007, at 3:40 PM, marius schebella wrote:
>
> > Hi alexandre,
> > why do you think it is not possible? or what exacactly do you want
> > to do?
> > If you try to have several glsl programs like a filter bank, first do
> > glsl-blur, then glsl-bloom, then glsl-apply-texture-to-model... then I
> > think this only works with gemframebuffer plus playing around with
> > "texunit 0", "texunit 1", and so on... and maybe also the right
> > in/outlets of texture to reference gpu textures.
> > unfortunately GEM on os x 10.5 is still broken, so I can only do very
> > rudimentary stuff (no developing), but before that I was trying to do
> > exactly this and I think it should be possible to do.
> > marius.
> >
> > Alexandre Quessy wrote:
> >> Hi,
> >> It seems like we cannot use two GLSL shader programs at a time.
> >> Hence,
> >> I need to merge both fragment and vertex programs to use them
> >> together.... Is there a way to use more than 2 shaders ? In Jitter,
> >> there is jit.gl.slab that allows that.
> >> http://www.cycling74.com/documentation/jit.gl.slab
> >>
> >> If not possible in Gem, that would be an awesome add-on to it.
> >>
> >
> >
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-- 
Alexandre Quessy
http://alexandre.quessy.net
http://www.puredata.info/Members/aalex