The S3TC Patent Finally Expires Next Week - S3 Texture Compression
Written by Michael Larabel in Standards on 29 September 2017 at 04:36 PM EDT. 31 Comments
STANDARDS --
If you need an extra reason to celebrate this weekend, next week the notorious S3 Texture Compression (S3TC) patent is set to expire!

S3TC has been a thorn in the side of open-source graphics driver developers for years. It's resulted in a nasty wreck that's long been problematic for both drivers and users from a legal perspective.

S3TC is a lossy texture compression widely used by many games and this compression method from S3 Graphics has been in use for many years going back to the OpenGL 1.3 and DirectX 6.0 days. In the OpenGL space it's provided by EXT_texture_compression_s3tc and without the support the performance/quality can be worse. S3TC support hasn't been present in Mesa by default due to the patent situation while there has been the external libtxc_dxtn library.


Come 2 October, the S3TC patent is expected to expire with the earliest filing date on it being 2 October 1997 and the expiry period being after 20 years.


Thankfully these days there are patent-free, royalty-free texture compression alternatives like ETC2 and ASTC, but S3TC is still used by a fair amount of software out there.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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