yangke li 0b0ab960e6 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.
#review-17314731
#jira UE-119388

[CL 17441496 by yangke li in ue5-main branch]

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

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