(Updated 2022-06-04)
etcpak is an extremely fast Ericsson Texture Compression and S3 Texture Compression (DXT1/DXT5) utility. Currently it's best suited for rapid assets preparation during development, when graphics quality is not a concern, but it's also used in production builds of applications used by millions of people.
Benchmark performed on an AMD Ryzen 9 7950X, using a real-life RGBA 16K × 16K atlas.
ETC1: ST: 797 Mpx/s, MT: 9613 Mpx/s
ETC2: ST: 335 Mpx/s, MT: 6016 Mpx/s
DXT1: ST: 4819 Mpx/s, MT: 10174 Mpx/s
DXT5: ST: 2287 Mpx/s, MT: 8038 Mpx/s
The same benchmark performed on Intel i7 1185G7:
ETC1: ST: 516 Mpx/s, MT: 2223 Mpx/s
ETC2: ST: 238 Mpx/s, MT: 984 Mpx/s
DXT1: ST: 2747 Mpx/s, MT: 9054 Mpx/s
DXT5: ST: 1331 Mpx/s, MT: 5483 Mpx/s
ARM benchmark performed on Odroid C2, using the same atlas:
ETC1: ST: 23.6 Mpx/s, MT: 90.6 Mpx/s
ETC2: ST: 12.3 Mpx/s, MT: 48.4 Mpx/s
DXT1: ST: 93.2 Mpx/s, MT: 346 Mpx/s
DXT5: ST: 68.5 Mpx/s, MT: 256 Mpx/s
Why there's no image quality metrics? / Quality comparison.
etcpak can also decompress ETC1, ETC2, DXT1 and DXT5 textures. Timings on Ryzen 7950X (all single-threaded):
ETC1: 604 Mpx/s
ETC2: 599 Mpx/s
DXT1: 1489 Mpx/s
DXT5: 1077 Mpx/s
i7 1185G7:
ETC1: 383 Mpx/s
ETC2: 378 Mpx/s
DXT1: 1033 Mpx/s
DXT5: 788 Mpx/s
Odroid C2:
ETC1: 48.9 Mpx/s
ETC2: 44.4 Mpx/s
DXT1: 104 Mpx/s
DXT5: 84.5 Mpx/s
To give some perspective here, Nvidia in-driver ETC2 decoder can do only 42.5 Mpx/s.
Original image:
Compressed image:
ETC1:
ETC2:
DXT1:
