d4bf23771d
This patches optimizes the Fog Glow Glare node to be about 25x faster for 4K images. This is mainly achieved by utilizing the FFTW library and multi-threading support code. Further improvements are still possible by caching kernels, but the CPU compositor does not support caching yet. The old Hartley transform was removed, so the node no longer works when FFTW is disabled as a build time option, much like the OIDN node. A new BLI library was introduced for FFTW, it includes some helper routines relevant for FFTW as well as an initialization routine that sets up multithreading using TBB as well as thread safety. Build system support for threaded FFTW was also added, which defines the relevant variables to detect threading support as well as add the relevant libraries. We do not currently have the threaded FFTW libs in our precompiled libs, so the threading code is disabled until the libs lands in the coming weeks. So currently, the code is only about 9x faster. The only functional change is that the kernel is now odd sized, which should produce more accurate results, but the final result is almost identical and mostly undetectable. The plan is to port this to the GPU as well similar to how we implement OIDN until we have a GPU FFT implementation. GPU compositor can also do caching, so it should be faster, being able to compute a 4K image in under half a second. Pull Request: https://projects.blender.org/blender/blender/pulls/121653
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