[Haskell-cafe] Loops and ray casting with GPipe?

[Henning Thielemann]

On Tue, 22 Mar 2011, Jarkko Vilhunen wrote:

> Greetings,
>
> With OpenGL shaders it is possible to write code utilizing loops with
> unknown number of iterations, I'm wondering if the same can be done
> with GPipe? Fractals would be one use case and implicit surfaces
> another. Fragment Floats had to be compared with IfB from
> Data.Boolean, so I tried something recursive like
>
> foo x = boolean x (foo (x * 0.9)) (x <* 1)

This is not tail-recursive - could that be the problem?

I also assume that GPipe is an EDSL and thus your expression just produces 
infinitely code in the shader language instead of running it.