The latest bc7enc_rdo repo is here.
I expected it to perform worse, yet it's blowing the more complex one away. The new algorithm is compatible with all the BC7 modes, too. The previous one was mostly hardwired for the main modes (mostly 1/6).
The new algorithm is much stronger:
The new algorithm is much stronger:
RDO BC7 new algorithm - lambda 1.0, 4KB window size
bc7enc -o -u4 -zc4096 J:\dev\test_images\xmen_1024.png -e -E -z1.0
37.15 dB, 3.97 bits/texel (Deflate)
RDO BC7 new algorithm - lambda 3.0, 4KB window size
bc7enc -o -u4 -zc4096 J:\dev\test_images\xmen_1024.png -e -E -z3.0
32.071 dB, 3.12 bits/texel (Deflate)
The new algorithm degrades way more gracefully:
lambda=4.0
30.812 dB, 2.94 bits/texel
29.883 2.69 bits/texel (Deflate)
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