[hdEmbree] Add utilities for processing ies light files #10
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Description of Change(s)
Note: this change replaces this earlier version:
This adds ies.h and ies.cpp, for processing ies light files.
These are originally taken from blender, v4.1.1:
https://github.com/blender/blender/blob/v4.1.1/intern/cycles/util/ies.h
https://github.com/blender/blender/blob/v4.1.1/intern/cycles/util/ies.cpp
These files are provided by Blender under the Apache 2.0 license. (See the note here about how the "Blender Cycles rendering engine is available as Apache 2.0").
These are not yet built / used, but merely introduce the files for use in the codebase later (ie, as part of a reworked PixarAnimationStudios#2758).
NOTE: This chain of PRs was made separate from the PR documenting expected behavior: