Mesa Preparing Software Fallback For S3TC Texture Compression
S3TC had been a headache for open-source GPU drivers due to patents around S3 Texture Compression. But the patents expired a few years ago and is no longer as much of a headache as it was years ago, especially with texture compression algorithms like ASTC coming about too.
Last week Erik Faye-Lund opened up a Mesa merge request adding the S3TC software fallback handling for cases where the graphics processor and/or driver lack the native S3TC handling. This software fallback can be used for getting more games running -- where they explicitly rely on S3TC support -- on the likes of the Arm Mali Panfrost driver, Raspberry Pi VC4, and other similar drivers.
This MR has the pending code for the S3TC software fallback that will hopefully be merged in time for next quarter's Mesa 22.3.