DXTC family decompression is slower than possible

Question

DXTC family decompression is slower than possible

Closed this issue 9 years ago · 1 comments

DXTC family (BC1, BC2, BC3, BC4/RGTC1, BC5/RGTC2) decompression is slower than possible due to extensive use of integer division, which is very slow on most architectures. Since only division of a value less than 2048 and only by 5 or 7 is required (as well as division by 3 for a smaller range), performance could be improved by using medium-sized look-up tables.

Answer 1 · 2015-04-30T23:44:56.000Z

Look-up tables have now been implemented.