now, to whining:

i use jit.rota @interp 1 a lot. i’ve gotten very good at knowing
exactly what settings to feed jit.brcosa to make up for the
corresponding decrease in matrix values that comes with interpolation
in a feedback system. but now that i’m moving this chain

source–>jit.xfade–>jit.brcosa–>jit.rota–>jit.xfade 2nd inlet

to this one:

640×480 source–>jit.gl.slab bork @file co.average.jxs–>jit.gl.slab
bork @file cc.brightness.ip.jxs–>jit.gl.slab bork @file
cc.contrast.ip.jxs–>jit.gl.slab bork @file cc.saturation.ip.jxs–
>jit.gl.slab bork @file td.rota.jxs–>averaging slab (in render
context bork)

of course, everything has changed. it’s MEGA FAST, but it’s changed.

is there a shader equivalent to the @interp attribute on jit.rota?
and also: how can i alter the td.rota.jxs file to include the weird
trig stuff- the cosoffsets and sinscales and thetasinscales of
jit.rota? i’m not going to go so far as to ask that i be given a new
td.rota.jxs, but can you at least point me in the right direction on
how to do it myself?

many thanks again for the upgrade. this is great.

j

The jit.rota helpfile gives the equation used to calculate
locations, so you could try making a shader based on that if you want
all the trig params. I opted for a linear algebra approach in this shader.

Developing this shader was a real headache on a Mobility card. We
ended up moving a lot of the code over to the vertex program because we
were hitting the instruction limit on AluBooks. For some reason, the
calculations necessary for “boundmode” make it difficult to add much
other stuff. If you were to remove the boundmode code, you would have a
lot more headroom for other parameters and calculation.

Arguably, it’s probably way easier to simply rotate a videoplane in GL
space.

It’s cool that you’re getting into slab stuff.

Enjoy!
Andrew B.

another question now- i see from the archives that there is a
performance benefit to combining slabs.

if i’m trying to use shaders to imitate jit.brcosa, in what order
should i do brightness/contrast/saturation?

jb

Am 25.06.2006 um 19:09 schrieb joshua goldberg:

> if i’m trying to use shaders to imitate jit.brcosa, in what order
> should i do brightness/contrast/saturation?

I just noticed this thread that deals with td.rota.jxs. This shader isn’t
part of the bundle I’m using (11/NOV/05). I couldn’t see a new shader bundle
distributed on the cycling74 website. Is the td.rota.jxs a free-floating
shader that is privately distributed or part of a distribution that I
somehow missed?

thx,
E.

Cheers,
Andrew B.

thx

E.