[Mesa-dev] S2TC - yet another attempt to solve the "S3TC issue"
divverent at xonotic.org
Tue Aug 9 07:48:14 PDT 2011
On Tue, Aug 09, 2011 at 03:16:34PM +0200, Philipp Klaus Krause wrote:
> Am 09.08.2011 13:10, schrieb Rudolf Polzer:
> > As for compression: the compressed format is basically "each 4x4 block is a
> > 2-color optimum palette image". Similar schemes have existed way before S3TC
> > […]
> See Beers et al., "Rendering from compressed textures" in the SIGGRAPH
> '96 proceedings for the AFAIK first use of this technique in texture
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.
describes a scheme that is VERY similar, except that that scheme additionally
uses a global palette for the two colors of the blocks, while "S2TC" stores the
two reference colors in the blocks directly. They achieve twice the compression
ratio that way.
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