[opensource-dev] Where oh where has my rendering gone?

[Joshua Bell]

On Tue, Oct 5, 2010 at 7:29 PM, Kent Quirk (Q Linden) <q at lindenlab.com>wrote:

> Well, it's not quite like that. To pull this off, you'd have to take
> everywhere we set a color, and set it instead to its equivalent black and
> white value (there's a formula that's traditionally used, although there's
> no "correct" way to do it:  Y = 0.3*R + 0.59*G + 0.11*B). You *might* be
> able to get away with modifying the LLColor4 constructor to do this, but
> it's probably going to have some surprising results when you assign a value
> and don't get the same value back.
>

How about post-processing every frame before the final swapBuffers call?
That seems like it could be done with a shader and only touching a small
amount of code. This would affect the UI as well as the world viewport,
however, without some significant refactoring, but given that we already
have some post-processing effects (glow, etc) perhaps there's already a good
spot to slot this in?

(Don't trust me too much, though, as I've never written a non-trivial shader
and have never touched the viewer's render pipeline!)

Of course, once you have monochrome output, you could tweak the shader and
get sepia-toned rendering. Old-timey SL, anyone?

-- Josh
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