...I mean, I feel like I'm using a synthesizer and I don't know how to
change the program within a bank, so I store all my timbres in program 1
of each bank and then switch among banks!!
On 06/10/2011 09:20 PM, Matteo Sisti Sette wrote:
Hi,
Let's first consider an example that does not involve shaders to explain
what's the thing that I can already do with images and that I would like
to apply to shaders.
Say I have M images and N squares, and I want to dynamically reassign
which image to use as a texture on which square. It may be M>N or M<N
but let's suppose M>N. At any time I want to say: rectangle m uses image
n. Multiple rectangles may be using the same image at a given time.
For a series of reasons I can't afford using "open" messages because I
want all the images to be preloaded. So one approach is to use
[pix_texture]'s right inlets and outlets.
I have M:
[pix_image]
|
[pix_texture]
and N:
[pix_texture]
|
[square]
By using [pix_texture]'s right outlets and inlets (with sends and
receives) I can "map" the texture I want to the square I want.
Now suppose that for each rectangle I want to use a shader that somewhat
mixes two (or may be even more) of the M textures, and I want to select
which ones dinamically.
How do I accomplish that? How do I "pass" texture id's (those coming
from the right outlets of textures) to the shader and have it correspond
to a sampler2D variable in the shader?
So far the only way to work with multiple textures in a shader and
dynamically set which textures to use from the patch, is to use
texunits. I send a [pix_texture] a "texunit K" message, and I send the
same number K to a uniform sampler2D variable of the shader.
However, there can only be up to 4 texunits available (maybe 8 on some
platform)!!!!! So this would only work for M and N <4 which is not my case.
There must be a way to use those texture id's that [pix_texture] uses,
isn't there?
Thanks
m.
_______________________________________________
Pd-list@iem.at mailing list
UNSUBSCRIBE and account-management ->
http://lists.puredata.info/listinfo/pd-list
