[Fluxus] fbo pixels commits

[Dave Griffiths]

On Thu, 2009-01-29 at 12:31 +0100, gabor papp wrote:
> for a couple of reasons i changed the primitive level binding to state
> level binding, so now the fbo is bound when entering a state, and
> unbound when leaving it, istead of changing fbo's when the primitive 
> is rendered.

I think that sounds like the right thing to do - I'm happy if you are :)

> there was a need for clearing the fbo manually. i don't know how you
> like this, but i changed pixels-clear, so it clears the pdata when the
> primitive is grabbed, but clears the fbo when it is bound.

Sounds fine, I think.

> now i'm going to try to sort out the camera issues. any suggestion how
> i should address this?

This is tricky isn't it... I haven't looked too closely at the new code,
but are you intending to kick off a new render for each pixel primitive?
You should be able to sequence things so the pixel primitives all get
rendered first, followed by the main scene - or are you doing this
already?

In which case I would say that each pixel primitive should have it's own
camera - which will have to be owned by the renderer, the multicamera
code is already there, so you would create a camera for each pixel
primitive and do something like:

(current-camera (pixels-camera p))
(set-camera-transform foo) ; change
(viewport 0 0.5 0 0.5)     ; stuff
(ortho)                    ; in this camera
(current-camera 0) ; set back to the main one

I intended to write a (with-camera) macro to make this a little cleaner
and more fluxus like... Also the internals of the renderer's camera list
and ownership will need looking at - so cameras get removed when pixel
prims get destroyed. I can help with some of this if you'd like.

cheers,

dave