Here are my first-ever RDO LDR ASTC 4x4 encodings. Perhaps they are the first ever for the ASTC texture format:
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RDO:
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Biased difference:![]()
I used astcenc to generate a .astc file, loaded it into memory, then used the code in ert.cpp/.h with a custom callback that decodes ASTC blocks. All the magic is in the ERT. Here's a match injection histogram - this works: 1477,466,284,382,265,398,199,109,110,87,82,105,193,3843
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These RDO ASTC encodes do not have any ultra-smooth block handling, because it's just something I put together in 15 minutes. If you look at the planet you can see the artifacts that are worse than they should be.
Non-RDO:
5.951 bits/texel, 45.1 dB, 75773 PSNR/bpt
4.286 bpt, 38.9 dB, 90752 PSNR/bpt
Biased difference:
I used astcenc to generate a .astc file, loaded it into memory, then used the code in ert.cpp/.h with a custom callback that decodes ASTC blocks. All the magic is in the ERT. Here's a match injection histogram - this works: 1477,466,284,382,265,398,199,109,110,87,82,105,193,3843
Another encode at lambda=.5:
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Next are larger blocks.