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Calx is an idiomatic wrapper for OpenCL, which is an abstraction layer for parallel computation. Using a C-variant language, a programmer can target CPUs, GPUs, and more exotic hardware (the Cell processor used in the PS3, for instance).

The OpenCL API is not known for its terseness; consider this ‘Hello World’ example example demonstrating the necessary steps to square a list of floating point numbers. Using Calx, the same result can be achieved like so:

(use 'calx)
(def source
  "__kernel void square (
       __global const float *a,
       __global float *b) {
    int gid = get_global_id(0);
    b[gid] = a[gid] * a[gid];

  (with-program (compile-program source)
    (let [a (wrap [1 2 3] :float)
          b (mimic a)]
      (enqueue-kernel :square 3 a b)
      (enqueue-read b))))

This is very much a work in progress, but still can be immediately useful for some purposes. Anyone using it is encouraged to give feedback.

The complete documentation can be found here.

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