Enable writing OpenCL operations and add first gpuified operation gimp:set-alpha

Ondřej Míchalrequested to merge
martymichal/gimp:wip/martymichal/gpuify-osa-yks into master

This takes the basic OpenCL writing framework from GEGL and plugs it into GIMP. OpenCL code can now rest in a separate .cl file which gets automatically converted into a header file accessible at app/operations/opencl/<op-name>.cl.h. All that is left to do for the writer is to write the _cl_process function and register it.

The gimp:set-alpha is very basic and simple to implement, so that was the lowest-hanging fruit I could think of to kick this off.

If you want to test and are not sure what uses this operation, you can trigger it with these steps

  1. Create layer
  2. Add alpha channel
  3. Draw some strokes
  4. Colours -> Colour to Alpha
  5. Layer -> Add Layer Masks -> Transfer layer's alpha channel

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