OpenCL doesn't do any mipmap preview acceleration
@ok
Submitted by Øyvind "pippin" Kolås Link to original bug (#762935)
Description
If you have an opencl implementation available you must for now set GEGL_USE_OPENCL=no before trying to use the microraptor gui interface of GEGL. With OpenCL accelertion there is no mipmap preview rendering done.
Adding code paths which permit doing at least point operations; but also other operatoins sped up for mipmap levels should also speed up future previews in GIMP.