wip/s2tc NetBSD

This package may be used as an unrestricted substitute for wip/libtxc_dxtn.

S2TC provides a subset of a wellknown texture compression scheme. This package provides the library libtxc_dxtn which can be used by grahics/MesaLib.

S2TC's format specification is very easy to implement, so it is not hard to make a working compressor or decompressor for it. It is based on Color Cell Compression[1] from 1986, and decoding is done entirely using the methods from there. Encoding is done using a search and refinement method that is derived from the methods described in that paper.

The compressor and decompressor here are licensed under a license that gives you all freedoms you will ever need (namely, the MIT license). In particular, the MIT license allows you to use, copy, modify, merge, publish, distribute, sublicense or sell the software, provided you keep copyright notices intact.

[1]: Graham Campbell, Thomas A. DeFanti, Jeff Frederiksen, Stephen A. Joyce, and Lawrence A. Leske. 1986. Two bit/pixel full color encoding. SIGGRAPH Comput. Graph. 20, 4 (August 1986), 215-223.