Cycles : Update to 5.1.0 with even sample motion blur patches

[boberfly]

I was able to upstream the type_names() from Brecht however it isn't using the tagged release but rather the release/v5.1 branch link just to note.

https://projects.blender.org/blender/cycles/src/branch/release/v5.1/

I don't use gafferDependencies anymore and haven't fully tested the build process, they did quite a bit of cmake changes so I suspect this may not build out of the box fully.

I have changes for Gaffer to go with this as well coming.

[johnhaddon]

it isn't using the tagged release but rather the release/v5.1 branch link just to note

So the build might change from one day to the next if something changes on that branch? If so, we can't accept that - we need dependencies builds to be completely repeatable. Maybe you can tie it to a specific commit by SHA?

How does this branch relate to the official 5.1 release anyway? Is it where maintenance will be done for patch versions? And is a tag for a patch likely to appear before we release 1.7?

[boberfly]

Hey @johnhaddon

The difference is just that type_names() patch added - I had it as a regular patch here against the tagged version, would that be preferred over the hash key representation? Agreed it could change later down the line.