Re: Antialiassing in an FxPlug
Re: Antialiassing in an FxPlug
- Subject: Re: Antialiassing in an FxPlug
- From: Gary Fielke <email@hidden>
- Date: Fri, 1 Feb 2008 00:26:07 +1030
Thanks Pete, just what I was after (the tiling tip will undoubtedly be
useful also)
Re the "scale down and resample result into the output" stage is it
preferable to use GLSL to average neighbour pixels in a frag shader?
Or is there a better option?
Out of curiosity I just tested out CILanczosScaleTransform to scale
down from a 2x2 FBO. It seemed to work well but a bit slow on my G4
PowerBook. This might be suitable for the rendering stage but I'm not
sure yet how well it would play if tiling of image buffers was required.
Thanks again
Gary
Hi Gary,
you're right, there are a lot of mines to step on when
trying to get multisampling working in an FxPlug. Since as you
discovered PBuffers don't support them, and I'm not sure of the state
of FBO support, we've tended to do the same operations manually. I
don't have much information on the state of hidden windows, since it's
been a long time since we used them, but it's a pretty unusual path to
be using these days and I wouldn't recommend it.
Basically, allocate a pbuffer or FBO that's several times larger than
the final output, and draw into it scaled up. Then as a final pass,
scale down and resample the result into the output.
One thing to watch out for with this is that you may hit card limits
to the maximum texture size, or even how many textures will fit in
VRAM at 16 and 32 bit float bit depths. FCP and Motion have checks to
limit the output size they request to stay within those limits. Rather
than allocating one large buffer, you may instead want to allocate
several smaller buffers at the output size, draw separately into them
as tiles, and then join them together by rendering them into the final
output.
Is that any help?
Pete
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