danny couture 90ed5f144f Optimize NVTT texture compression using AVX2 ...

- Load the proper delay-loaded dll depending on instruction support of the current platform.
  - Replaced reciprocal approximation with proper division.
    - This improves performance as the division is faster than a reciprocal with refinement on recent CPUs.
    - This improves quality as the division provides higher precision.
    - It fixes a nasty non-determinism in the DDC because reciprocal yield different results on different CPUs.
  - Configured so that AVX2 and SSE2 results are exactly the same (see config.h).
  - More details can be found in config.h

  - 80.773s -> 47.547s for single-threaded 8k texture compression
  - 18m34s -> 14m50s for recompressing all textures of Reverb P_World during level loading.

#rb Francis.Hurteau, Geoff.Evans

[CL 14362917 by danny couture in ue5-main branch]

2020-09-22 05:48:20 -04:00

..

Private

Optimize NVTT texture compression using AVX2

2020-09-22 05:48:20 -04:00

Public

Add an option to downscale textures without mips. Accepts values between 1.0 and 8.0.

2020-03-25 08:18:43 -04:00

TextureCompressor.Build.cs

Updating copyright for Engine Developer.

2019-12-26 15:32:37 -05:00