Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of current framebuffer window, and use it for further processing?
Thanks, pcp.
Pepa Henzl a écrit :
Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of current framebuffer window, and use it for further processing?
yes. you need to render in a frambuffer, and then use it as a texture. the gemframebuffer is almost undocumented, but there is an exemple in exemple/07.texture/10.frambuffer.
i also rembermber that i send a patch on this list (or gem-dev) regardinf the use of glsl + framebuffer.
cyrille
Thanks, pcp.
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yes, but... it works, but you have to think about a lot of things and when it really comes to chaining separate modules together it really gets complicated. your gemchain has to look like this:
[gemhead 49] | [shader] | [gemframbuffer] | [translateXYZ 0 0 -4] | [some...texture] | [square 4]
always give the gemhead a number smaller than the consecutive gemheads, so that the textures are created before they are used in the next gemchain. in the gemchain itself the shader has to be placed *before* the framebuffer! gemframebuffer always "resets" the viewpoint, so you have to translate everything into negative z to make it visible. texture needs mode 1 on some cards and mode 0 on other cards, this also has to be the same as in the shader (sample2D v. sample2DRect). the geo has to correlate with the translate and cover the whole range, otherwise you wil crop the image or it will be too small. gemframebuffer also takes an argument "dim" that will affect the quality.
if you have all that then you can send the right outlet of gemframebuffer (which is a number) to another texture right inlet and another shader can use that.
this is a little complicated but will work for a shader chain patch.
now when you think about a modular shader system, where you can just add shader abstraction into a chain, it gets much much more complicated. because when you have a combination like
[shader] | [pix_image] | [texture]
then the right inlet of texture can get any number, the shader will always take the image instead, so you cannot do your usual chains, but will have to refer an image from somewhere else. it is also difficult to debug, because the gemframebuffer will not output a texture... and then - if you use multiple shader modules - you also have to change the renderorderof the gemhead. with [set 40( or something, but how do you know at which position you use the shader module??...
a solution for this would be to turn gemheads off and only trigger them by "bang" messages.
ok, the only thing missing right now is a patch showing how this works in practice. I will do my best...
marius.
cyrille henry wrote:
Pepa Henzl a écrit :
Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of current framebuffer window, and use it for further processing?
yes. you need to render in a frambuffer, and then use it as a texture. the gemframebuffer is almost undocumented, but there is an exemple in exemple/07.texture/10.frambuffer.
i also rembermber that i send a patch on this list (or gem-dev) regardinf the use of glsl + framebuffer.
cyrille
Thanks, pcp.
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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hi, I put an example patch for chaining glsl shader modules at http://www.parasitaere-kapazitaeten.net/Pd/shader_chain it uses one of cyrille's shader examples. marius.
marius schebella wrote:
yes, but... it works, but you have to think about a lot of things and when it really comes to chaining separate modules together it really gets complicated. your gemchain has to look like this:
[gemhead 49] | [shader] | [gemframbuffer] | [translateXYZ 0 0 -4] | [some...texture] | [square 4]
always give the gemhead a number smaller than the consecutive gemheads, so that the textures are created before they are used in the next gemchain. in the gemchain itself the shader has to be placed *before* the framebuffer! gemframebuffer always "resets" the viewpoint, so you have to translate everything into negative z to make it visible. texture needs mode 1 on some cards and mode 0 on other cards, this also has to be the same as in the shader (sample2D v. sample2DRect). the geo has to correlate with the translate and cover the whole range, otherwise you wil crop the image or it will be too small. gemframebuffer also takes an argument "dim" that will affect the quality.
if you have all that then you can send the right outlet of gemframebuffer (which is a number) to another texture right inlet and another shader can use that.
this is a little complicated but will work for a shader chain patch.
now when you think about a modular shader system, where you can just add shader abstraction into a chain, it gets much much more complicated. because when you have a combination like
[shader] | [pix_image] | [texture]
then the right inlet of texture can get any number, the shader will always take the image instead, so you cannot do your usual chains, but will have to refer an image from somewhere else. it is also difficult to debug, because the gemframebuffer will not output a texture... and then - if you use multiple shader modules - you also have to change the renderorderof the gemhead. with [set 40( or something, but how do you know at which position you use the shader module??...
a solution for this would be to turn gemheads off and only trigger them by "bang" messages.
ok, the only thing missing right now is a patch showing how this works in practice. I will do my best...
marius.
cyrille henry wrote:
Pepa Henzl a écrit :
Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of current framebuffer window, and use it for further processing?
yes. you need to render in a frambuffer, and then use it as a texture. the gemframebuffer is almost undocumented, but there is an exemple in exemple/07.texture/10.frambuffer.
i also rembermber that i send a patch on this list (or gem-dev) regardinf the use of glsl + framebuffer.
cyrille
Thanks, pcp.
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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Nice, that one just worked for me. It would be even more fun with a
video camera. I couldn't get that one going...
.hc
On Mar 21, 2008, at 10:18 PM, marius schebella wrote:
hi, I put an example patch for chaining glsl shader modules at http://www.parasitaere-kapazitaeten.net/Pd/shader_chain it uses one of cyrille's shader examples. marius.
marius schebella wrote:
yes, but... it works, but you have to think about a lot of things and when it
really comes to chaining separate modules together it really gets
complicated. your gemchain has to look like this:[gemhead 49] | [shader] | [gemframbuffer] | [translateXYZ 0 0 -4] | [some...texture] | [square 4]
always give the gemhead a number smaller than the consecutive
gemheads, so that the textures are created before they are used in the next
gemchain. in the gemchain itself the shader has to be placed *before* the framebuffer! gemframebuffer always "resets" the viewpoint, so you have to
translate everything into negative z to make it visible. texture needs mode 1 on some cards and mode 0 on other cards, this
also has to be the same as in the shader (sample2D v. sample2DRect). the geo has to correlate with the translate and cover the whole
range, otherwise you wil crop the image or it will be too small.
gemframebuffer also takes an argument "dim" that will affect the quality.if you have all that then you can send the right outlet of gemframebuffer (which is a number) to another texture right inlet and another shader can use that.
this is a little complicated but will work for a shader chain patch.
now when you think about a modular shader system, where you can
just add shader abstraction into a chain, it gets much much more complicated. because when you have a combination like[shader] | [pix_image] | [texture]
then the right inlet of texture can get any number, the shader will always take the image instead, so you cannot do your usual chains,
but will have to refer an image from somewhere else. it is also difficult to debug, because the gemframebuffer will not output a texture... and then - if you use multiple shader modules - you also have to
change the renderorderof the gemhead. with [set 40( or something, but how do you know at which position you use the shader module??...a solution for this would be to turn gemheads off and only trigger
them by "bang" messages.ok, the only thing missing right now is a patch showing how this
works in practice. I will do my best...marius.
cyrille henry wrote:
Pepa Henzl a écrit :
Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of
current framebuffer window, and use it for further processing?yes. you need to render in a frambuffer, and then use it as a texture. the gemframebuffer is almost undocumented, but there is an
exemple in exemple/07.texture/10.frambuffer.i also rembermber that i send a patch on this list (or gem-dev) regardinf the use of glsl + framebuffer.
cyrille
Thanks, pcp.
PD-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
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"It is convenient to imagine a power beyond us because that means we
don't have to examine our own lives.", from "The Idols of
Environmentalism", by Curtis White
just replace pix_image with pix_video. marius.
Hans-Christoph Steiner wrote:
Nice, that one just worked for me. It would be even more fun with a video camera. I couldn't get that one going...
.hc
On Mar 21, 2008, at 10:18 PM, marius schebella wrote:
hi, I put an example patch for chaining glsl shader modules at http://www.parasitaere-kapazitaeten.net/Pd/shader_chain it uses one of cyrille's shader examples. marius.
marius schebella wrote:
yes, but... it works, but you have to think about a lot of things and when it really comes to chaining separate modules together it really gets complicated. your gemchain has to look like this:
[gemhead 49] | [shader] | [gemframbuffer] | [translateXYZ 0 0 -4] | [some...texture] | [square 4]
always give the gemhead a number smaller than the consecutive gemheads, so that the textures are created before they are used in the next gemchain. in the gemchain itself the shader has to be placed *before* the framebuffer! gemframebuffer always "resets" the viewpoint, so you have to translate everything into negative z to make it visible. texture needs mode 1 on some cards and mode 0 on other cards, this also has to be the same as in the shader (sample2D v. sample2DRect). the geo has to correlate with the translate and cover the whole range, otherwise you wil crop the image or it will be too small. gemframebuffer also takes an argument "dim" that will affect the quality.
if you have all that then you can send the right outlet of gemframebuffer (which is a number) to another texture right inlet and another shader can use that.
this is a little complicated but will work for a shader chain patch.
now when you think about a modular shader system, where you can just add shader abstraction into a chain, it gets much much more complicated. because when you have a combination like
[shader] | [pix_image] | [texture]
then the right inlet of texture can get any number, the shader will always take the image instead, so you cannot do your usual chains, but will have to refer an image from somewhere else. it is also difficult to debug, because the gemframebuffer will not output a texture... and then - if you use multiple shader modules - you also have to change the renderorderof the gemhead. with [set 40( or something, but how do you know at which position you use the shader module??...
a solution for this would be to turn gemheads off and only trigger them by "bang" messages.
ok, the only thing missing right now is a patch showing how this works in practice. I will do my best...
marius.
cyrille henry wrote:
Pepa Henzl a écrit :
Hello, I've just started with glsl languague and Gem this week. Everything works fine, but i'd like to know what to do if i want to apply multiple effects on a texture. Is it possible to render pix data to the texture, instead of current framebuffer window, and use it for further processing?
yes. you need to render in a frambuffer, and then use it as a texture. the gemframebuffer is almost undocumented, but there is an exemple in exemple/07.texture/10.frambuffer.
i also rembermber that i send a patch on this list (or gem-dev) regardinf the use of glsl + framebuffer.
cyrille
Thanks, pcp.
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"It is convenient to imagine a power beyond us because that means we don't have to examine our own lives.", from "The Idols of Environmentalism", by Curtis White
Hi List, happy easter...
I was going through the "mapping"-abstractions and when i tried to
run anything
with "pm"--blabla...
i realized that msd seems to be broken, or not compiled for intel-mac
looks like Nikolas' Site is down...
So does anyone have msd copiled for mac-Intel or a Link ???
Thanks Luigi
Hi Luigi,
So does anyone have msd copiled for mac-Intel or a Link ???
i think the ones at http://grrrr.org/ext/beta/pd/osx/ are UB, hence
they should work for you.
gr~~~
-
cyrille henry -
Hans-Christoph Steiner -
Luigi Rensinghoff -
marius schebella -
Pepa Henzl -
Thomas Grill