The underlying cause for these issues is the insufficient sampling of
the bokeh image. For smaller blur radius there will be very few samples
taken, and with 1-pixel radius it boils down to just 4 samples:
2 on the left border (black), 1 in the center (black) and 1 at the top
border (blue) ...
For now have added the workarounds implemented in the CPU version of
that node, which hide these artifacts. Ultimately would be better to
have mipmap levels for the bokeh image input instead.
re-optimized the Defocus node.
* localized MemoryBuffers
* removed read(x,y) calls
* shuffled some lines in the execute pixel
* added a readNoCheck function to the memorybuffer (only use this when
you are certain you are reading a pixel inside the memorybuffer.
Added OpenCL kernel for the directional blur.
This operation always uses the full input image. In the current
implementation this input image is not cached on the device.
Future enhancement could be to cache it on the available opencl devices
`````|````` | | | ..''''
| | | |______ .''
| | | | ..'
| | |_______ |___________ ....''
merge to TRUNK!
* The old compositor is still available (Debug Menu: 200)
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