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Mesa3D Graphics Library (Bleeding edge ray tracing branches)
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Kenneth Graunke c54555c496 Revert "st/mesa: Transcode ASTC to BC7 (BPTC) where possible" 
This reverts commit 68ef895674.

When trying out transcode_astc=true with BPTC on Asphalt 9, we observed
very poor image quality - to the point that basic UI icons were blocky,
and buttons with a black border had smeared pixels on the edges.  Using
DXT5 had no such issues.

I originally suspected there was a bug in the BPTC encoder, but I now
believe the issue is deeper than that.  The commit that introduced the
encoder, 17cde55c53, says:

   "The compressor is written from scratch and takes a very simple
    approach.  It always uses a single mode of the BPTC format (4 for
    unorm and 3 for half-floats) and picks the two endpoints by dividing
    the texels into those which have more or less than the average
    luminance of the block and then calculating an average color of the
    texels within each division.

    It's probably not really sensible to try to use BPTC compression at
    runtime because for example with the Nvidia offline compression tool
    it can take in the order of an hour to compress a full-screen image.
    With that in mind I don't think it's worth having a proper compressor
    in Mesa and this approach gives reasonable results for a usage that
    is basically a corner case."

In other words, the reason our BPTC compressor was so fast is that it
only implements one of the modes and does a low quality approximation.
This honestly should probably be improved somewhat, but the original
use case was for online-compression, the uncommon but mandatory OpenGL
feature where you can supply uncompressed data and trust the driver to
compress it for you (at unknown and uncontrolled quality and speed).

Unfortunately, the compressor as it stands is simply not usable for
transcoding ASTC data where we want to preserve the underlying image
quality as much as possible.

Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16566>
 		2022-05-18 09:45:43 +00:00
.gitlab/issue_templates issue_templates/Bug Report: Rename master branch to main 2021-05-05 12:20:11 -07:00
.gitlab-ci radv/ci: enable the experimental support for mesh shaders 2022-05-18 06:48:05 +00:00
android gallium/swr: Remove common code and build options 2021-12-06 23:37:50 +00:00
bin bin: Add a script for filtering/sorting refcount logs 2022-05-02 16:58:20 +00:00
build-support configure: commit test files 2017-10-16 16:32:43 -07:00
docs docs: update extensions for V3D and VC4 2022-05-18 08:18:21 +00:00
include include: update amdgpu_drm.h 2022-05-16 07:03:39 -04:00
src Revert "st/mesa: Transcode ASTC to BC7 (BPTC) where possible" 2022-05-18 09:45:43 +00:00
subprojects meson: Update libelf wrap for Windows 2021-11-12 09:46:10 +00:00
.dir-locals.el
…
.editorconfig editorconfig: Use 3-space tabs for .rst 2021-06-22 17:37:55 +00:00
.gitattributes Add new rules to .gitattributes 2022-01-19 15:17:17 +00:00
.gitignore intel/tools: Add unit tests for assembler 2019-05-07 14:33:48 -07:00
.gitlab-ci.yml ci: Disable jobs to the Collabora lab 2022-05-18 08:00:23 +02:00
.mailmap .mailmap: Switch Jason Ekstrand to @collabora.com 2022-01-26 20:08:31 +00:00
.travis.yml travis: Download XQuartz from GitHub. 2021-05-29 10:25:16 +00:00
CODEOWNERS ci: add Broadcom CI maintainer 2022-04-12 10:42:31 +00:00
README.rst docs: promote #dri-devel on oftc over freenode 2021-05-24 09:21:48 +00:00
VERSION VERSION: bump to 22.2-devel for next cycle 2022-04-13 23:40:25 +00:00
meson.build meson: Support d3d12 as a video-supporting driver 2022-05-17 21:02:25 +00:00
meson_options.txt meson: deprecate specifying osmesa-bits 2022-04-29 19:30:03 +00:00

README.rst 

`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


Source
------

This repository lives at https://gitlab.freedesktop.org/mesa/mesa.
Other repositories are likely forks, and code found there is not supported.


Build & install
---------------

You can find more information in our documentation (`docs/install.rst
<https://mesa3d.org/install.html>`_), but the recommended way is to use
Meson (`docs/meson.rst <https://mesa3d.org/meson.html>`_):

.. code-block:: sh

  $ mkdir build
  $ cd build
  $ meson ..
  $ sudo ninja install


Support
-------

Many Mesa devs hang on IRC; if you're not sure which channel is
appropriate, you should ask your question on `OFTC's #dri-devel
<irc://irc.oftc.net/dri-devel>`_, someone will redirect you if
necessary.
Remember that not everyone is in the same timezone as you, so it might
take a while before someone qualified sees your question.
To figure out who you're talking to, or which nick to ping for your
question, check out `Who's Who on IRC
<https://dri.freedesktop.org/wiki/WhosWho/>`_.

The next best option is to ask your question in an email to the
mailing lists: `mesa-dev\@lists.freedesktop.org
<https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_


Bug reports
-----------

If you think something isn't working properly, please file a bug report
(`docs/bugs.rst <https://mesa3d.org/bugs.html>`_).


Contributing
------------

Contributions are welcome, and step-by-step instructions can be found in our
documentation (`docs/submittingpatches.rst
<https://mesa3d.org/submittingpatches.html>`_).

Note that Mesa uses gitlab for patches submission, review and discussions.