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Brecht Van Lommel ac51d331df Refactor: Cycles light sampling code reorganization ...

* Split light types into own files, move light type specific code from
  light tree and MNEE.
* Move flat light distribution code into own kernel file and host side
  building function, in preparation of light tree addition. Add light/sample.h
  as main entry point to kernel light sampling.
* Better separate calculation of pdf for selecting a light, and pdf for
  sampling a point on the light. The selection pdf is now also stored in
  LightSampling for MNEE to correctly recalculate the full pdf when the
  shading position changes but the point on the light remains fixed.
* Improvement to kernel light storage, using packed_float3, better variable
  names, etc.

Includes contributions by Brecht Van Lommel and Weizhen Huang.

Ref T77889

2022-11-30 21:19:51 +01:00

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