One last non-RDO BC7 benchmark: ispc_texcomp slow vs. my encoder in perceptual mode

"ISPC" is Intel's Fast ISPC Texture Compressor. (Both of our encoders use ispc.)

In perceptual mode, you basically trade off around 1 dB of RGB PSNR for a gain of 2.6 dB Luma PSNR, relative to ispc_texcomp. Our per-mode encoding time is actually slower in perceptual mode, but we don't use modes 4 and 5 in perceptual mode yet which helps compensate for the slowdown.

Perceptual mode (total encode CPU time, average RGB PSNR, average Luma PSNR):
ISPC: 353.245527 46.769749 48.568988
Ours: 216.838825 45.782654 51.185091 

ISPC mode histogram:
367473 370942 26227 633692 26789 116571 318478 0
Ours mode histogram:
47882 409997 18025 185524 0 0 1198744 0

RGB mode:
ISPC: 352.133776 46.769749 48.568988
Ours: 227.692341 47.029635 48.903907 

ISPC mode histogram:
367473 370942 26227 633692 26789 116571 318478 0
Ours mode histogram:
33264 411398 21192 186552 25437 68297 1114032 0

I'm writing some API's to expose this encoder in the Basis DLL/SO/dylib. It'll be exposed just like Intel's encoder (you call it with an array of blocks and you handle the multithreading).