Texture Compression Update (Alpha testing)

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Since @Jerakin asked for some numbers from my testing.
Thanks to this I found a thing I had forgot to change, add the LZ4 compression on the textures(!). It was previously turned off since minimal impact on the WebP compressed textures.

  • 5 textures (256x256) 2xRGB, 2xRGBA, 1xR
  • With mipmaps
  • macOS

Build times

WebP (lossy)      14.808s
WebP (non lossy)  14.816s
Basis             7.035s

Size on disc: (game.arcd) (LZ4 compressed):

WebP (lossy)      313930
WebP (non lossy)  315906
Basis             395526

the uncompressed basis textures were 645846 bytes

Runtime decompress/transcode

WebP (lossy)      5 textures / 327680 texels in 7.487000 ms
WebP (non lossy)  5 textures / 327680 texels in 7.310000 ms
Basis             5 textures / 436905 texels in 4.886000 ms

I calculated the texel count is more accurate on basis. They should be the same

Update The average LZ4 compression of the basis textures are ~42% of the original size.
Also note that we anticipate even more compression ratio improvements from Basis Universal, as they continue to develop it as we speak.

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