yangke li abb9346236 add ARM ASTC Encoder, support HDR profile, add astc hdr pixel format for opengl, vulkan and metal ...

todo:  hdr decode at runtime when astc hdr not supported
needs to figure out why ARM Encoder is much slower than ISPC, use ARM only for HDR Textures might be a good compromise.
#jira UE-119388

#ROBOMERGE-AUTHOR: yangke.li
#ROBOMERGE-SOURCE: CL 17441496 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v870-17433530)

[CL 17441499 by yangke li in ue5-release-engine-test branch]

2021-09-07 01:24:23 -04:00

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