[Mesa-dev] [PATCH 00/15] Import libtxc_dxtn's S3TC code into Mesa!

[Matt Turner]

The patent on S3TC has now expired! Rejoice!

This series imports the code from Roland's libtxc_dxtn into Mesa and cleans up
some mess dealing with the possibility of S3TC not being available.

EXT_texture_compression_s3tc and ANGLE_texture_compression_dxt are now always
enabled where supported.

Note that I did almost nothing to fix the style of the imported code. Feel free
to send patches, but I'm not interested in making those changes in this series.


I also considered using Rich Geldreich's crunch [2], but a few things made be
choose to start with libtxc_dxtn instead:

   - crunch is written bn C++ and does not look like Mesa code at all.

   - Higher risk. Unknown how it compares to libtxc_dxtn. I can believe
     libtxc_dxtn does a worse job compressing, but at least we know exactly
     what we are getting with it.

   - crunch actually does a lot more than just DXT1/a/3/5. Was unclear how
     separable those pieces were from the rest.

Regardless, trying to use crunch would be an interesting experiment.

Please review!

[1] https://github.com/BinomialLLC/crunch

[PATCH 01/15] mesa: Import libtxc_dxtn sources
[PATCH 02/15] mesa: Combine libtxc_dxtn sources into
[PATCH 03/15] mesa: Remove commented-out DXTn fetch code
[PATCH 04/15] mesa: Remove prototypes and mark S3TC functions static
[PATCH 05/15] mesa: Remove fprintf referring to libdxtn
[PATCH 06/15] mesa: Call DXTn functions directly
[PATCH 07/15] mesa: Drop function pointer checks in s3tc code
[PATCH 08/15] mesa: Drop Mesa_DXTn from gl_context
[PATCH 09/15] mesa/st: Drop has_lib_dxtc argument from
[PATCH 10/15] gallium: Remove util_format_s3tc_enabled
[PATCH 11/15] gallium: Remove util_format_s3tc_init()
[PATCH 12/15] mesa: Remove force_s3tc_enable driconf variable
[PATCH 13/15] mesa: Delete now unused dlopen.h
[PATCH 14/15] build: Remove HAVE_DLOPEN
[PATCH 15/15] travis: Remove libtxc_dxtn from the build