Clojure -> GLSL translation

[rogerallen]

Transferring this issue from original repository rogerallen#9

Sam Aaron suggested:
Another interesting option would be to write a transpiler from Clojure to glsl code.

Karsten Schmidt followed up with:
Re: Sam's comment about a CLJ -> GLSL compiler: Zach Tellman's old
Penumbra project has a mention of something like that, though I can't
comment on if or how well it works:

See here:
https://github.com/ztellman/penumbra/tree/master/src/penumbra/glsl

From the forum
On Thu, Apr 4, 2013 at 1:40 AM, Stathis sideris@---.com wrote:
I may be a bit late to the party, but the "transpiler" bit for generating GLSL code from Clojure has already been implemented in Penumbra which is no longer in development, but maybe could be cannibalised? Here is an example of a shader written in "clojure" code that's translated to GLSL by this part of Penumbra.

Stathis

And finally, the original author also mentioned:

Speaking as the person who wrote the GLSL transpilation, I'd recommend against using the Penumbra code wholesale. The type inference is finicky, and the implementation is fairly opaque. However, if you have any questions about what's going on there, feel free to get in touch. I don't guarantee I remember enough to answer everything, but I can at least point you in the right direction.

Zach

So, when I get ready to do this, I'll follow up with Zach

[rogerallen]

First steps went in today with 47cb759

At this point, it just does a straight translation of "clojure-like" s-expressions--not Clojure. That might be as far as this goes...I'm not sure.

[rogerallen]

This isn't Clojure->GLSL, but I really don't know if that's worth the pain of implementation for what it will be used for. If anyone is aware of a Clojure->C compiler I could use, then please add a comment. Otherwise, I'm just going with this simple single-pass lisp->string converter for now.

I'm calling this "good enough" to close. We'll open further issues for things that come up.