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etcpak 2.0

The fastest ETC compressor on the planet

etcpak is an extremely fast Ericsson Texture Compression and Block Compression 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.

Compression times

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: 356 Mpx/s, MT: 6378 Mpx/s
BC1: ST: 5730 Mpx/s, MT: 10174 Mpx/s
BC3: ST: 2437 Mpx/s, MT: 8568 Mpx/s
BC7: ST: 12.1 Mpx/s, MT: 225 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
BC1: ST: 2969 Mpx/s, MT: 9199 Mpx/s
BC3: ST: 1351 Mpx/s, MT: 5503 Mpx/s
BC7: ST: 7.8 Mpx/s, MT: 21.3 Mpx/s

Apple M3 Max benchmark:

ETC1: ST: 204 Mpx/s, MT: 2455 Mpx/s
ETC2: ST: 101 Mpx/s, MT: 1231 Mpx/s
BC1: ST: 3255 Mpx/s, MT: 30366 Mpx/s
BC3: ST: 1147 Mpx/s, MT: 13238 Mpx/s
BC7: ST: 5.47 Mpx/s, MT: 65.8 Mpx/s

Why there's no image quality metrics? / Quality comparison.

Decompression times

etcpak can also decompress textures. Timings on Ryzen 7950X (all single-threaded):

ETC1: 604 Mpx/s
ETC2: 599 Mpx/s
BC1: 1634 Mpx/s
BC3: 1172 Mpx/s
BC7: 201 Mpx/s

i7 1185G7:

ETC1: 383 Mpx/s
ETC2: 378 Mpx/s
BC1: 1056 Mpx/s
BC3: 788 Mpx/s
BC7: 76 Mpx/s

M3 Max:

ETC1: 690 Mpx/s
ETC2: 786 Mpx/s
BC1: 2434 Mpx/s
BC3: 1414 Mpx/s
BC7: 406 Mpx/s

To give some perspective here, Nvidia in-driver ETC2 decoder can do only 42.5 Mpx/s.

Quality comparison

Original image:

Compressed image:

ETC1:

ETC2:

BC1:

BC7: