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- <meta name="Author" content="Daniel Borca"/>
- <meta name="Description" content="Texture compression"/>
- <meta name="KeyWords" content="FXT1, DXTn, S3TC, DXT1, DXT3, DXT5, texture, compression, codec, compressor, decompressor"/>
-
- <title>Texture compression</title>
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- <center><h2>Texture compression</h2></center>
- <hr/>
-
- <p><a href="tc-1.1.tar.gz">tc-1.1.tar.gz</a> is a working codec for <b>FXT1</b> and <b>DXTn</b> texture compression.
- It has a balanced speed/quality ratio, and is very tweakable.</p>
- <p>Both <b>FXT1</b> and <b>DXTn</b> use vector quantization for lossy encoding.
- The decoder is rather trivial, at the expense of the encoder
- complexity. This means that applications heavily relying on
- texture compression should provide precompressed textures, for
- several obvious reasons:</p>
- <ol>
- <li>the encoding phase can be done "off-line" with hi-quality
- encoders</li>
- <li>if the graphic driver does not support precompressed textures,
- it's still cheap to decode "on-line" application-side</li>
- <li>the distributed package gets smaller</li>
- </ol>
- <p>The <b>FXT1</b> and <b>DXTn</b> codecs were written using documentation freely
- available on the world-wide-web, including, but not limited to:
- 3DFX_texture_compression_FXT1 and EXT_texture_compression_s3tc
- from <a href="http://oss.sgi.com/projects/ogl-sample/registry/">http://oss.sgi.com/projects/ogl-sample/registry/</a><BR/>
- I just translated the human readable spec into ANSI C. There are
- NO binaries available, as I am <b>NOT</b> using this code! <b>Therefore,
- <font color="#D8D8D8">THE RESPONSIBILITY OF USING THE CODE IS ENTIRELY WITH YOU!</font></b></p>
- <p>The implementation <I>per-se</I> is made available under GPL, which
- does not necessarily apply to the abstract content (texture
- compression algorithms):</p>
- <p><b>FXT1</b> is subject to "3DFX FXT1 Source Code General Public License"</p>
- <p><b>DXTn</b> is basically the S3TC texture compression, a license to the
- "S3TC Intellectual Property" may be required prior to any use.</p>
- <dir>
- <p>There is significant IP associated with the S3TC format.
- Existing users probably have executed licenses directly
- with S3 or its successors (Sonic Blue, S3 Graphics).</p>
-
- <p>The current ownership of the S3TC IP is unknown to me. It is
- known that when S3 exited the graphics hardware business, part of
- their operations were sold to ATI and part were spun off to a joint
- Taiwanese venture with Via Technologies, called S3 Graphics.</p>
- </dir>
- <p><b><font color="#D8D8D8">I, DANIEL BORCA, AM NOT AWARE OF ANY LEGAL ISSUE CAUSED BY RELEASING
- THIS CODE.</font> Prior to commencement of legal action, the Plaintiff should
- make an informal demand to Cease and Desist. In deference to the
- regulations of the Federal Communications Commission, which requires
- notice prior to filing an action, and in the spirit of cooperation,
- all complaints, issues and concerns should first be directed to me
- in an effort to resolve them amicably and promptly. FCC s2250.</b></p>
- <p/>Daniel Borca<br/>
- <a href="mailto:dborca%20'at'%20yahoo%20'dot'%20com">dborca 'at' yahoo 'dot' com</a>
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projects / reactos.git / blobdiff