Transferring one multitexture FBO to a second

@chao-mu wrote:

Hello,

I have two ofFBOs that have multiple textures attached to them. One is meant as a historical record of the second.

I am curious what the proper way of doing this is.

I’ve tried

last_outputs_.begin();
last_outputs_.activateAllDrawBuffers();
outputs_.draw(0, 0);
last_outputs_.end();

but that only copies the first texture.

I have also tried the following:

            for (int i=0; i < last_outputs_.getNumTextures(); i++) {
                ofTexture& tex = last_outputs_.getTexture(i);
                tex.bind();
                outputs_.getTexture(i).draw(0, 0);
                tex.unbind();
            }

But that doesn’t seem to transfer anything

I have also

           last_outputs_.begin();
           last_outputs_.activateAllDrawBuffers();
            for (int i=0; i < last_outputs_.getNumTextures(); i++) {
                ofTexture& tex = last_outputs_.getTexture(i);
                tex.bind();
                outputs_.getTexture(i).draw(0, 0);
                tex.unbind();
            }
          last_outputs_.end();

but that, for some reason, wipes out texture i=0 if I wrote to texture i=1.

The code base is too massive to be useful to share, but if I get an idea of what SHOULD work, I can more target my debugging.

Also, as an additional note, I specifically don’t want to transfer bytes between the graphics card and CPU as the ultimate fate of last_outputs_ is to simply be passed through my shader pipeline (it’d be a waste).

Thank you,
HP.

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