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Mesa3D Graphics Library (Bleeding edge ray tracing branches)
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Pierre-Eric Pelloux-Prayer 09dc0fb2ee loader/dri3: avoid reusing the same back buffer with DRI_PRIME 
For DRI_PRIME setup where the dGPU -> iGPU copy can happen asynchronously,
we need to ensure that we're not continuously reusing the same back buffer.

The existing code relies on XCB_PRESENT_EVENT_IDLE_NOTIFY to decide if
a buffer is busy or idle. If this event is received before the hardware
is done using the buffer, then it will reuse the same buffer and introduce
a dependency between the copy and the next frame.

This commit mitigates this by trying to allocate a different back buffer
when called from dri3_get_buffer (not from dri3_find_back_alloc, because it
seems that it expects dri3_get_buffer - see 0cc4c7e33e).

An alternative would be to query the busy-ness using is_resource_busy
but this complicates the code to achieve the same result.

One affected app is Unigine Superposition, and this change improves the
score by 0% - 5% depending on the settings.

This behavior is enabled if PIPE_CAP_PREFER_BACK_BUFFER_REUSE is 0.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-by: Michel Dänzer <mdaenzer@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12788>
 		2021-09-29 08:14:57 +00:00
.gitlab/issue_templates issue_templates/Bug Report: Rename master branch to main 2021-05-05 12:20:11 -07:00
.gitlab-ci ci: Uprev deqp-runner to 0.9.0 2021-09-29 05:47:55 +00:00
android AOSP: Add panfrost vulkan library suffix 2021-08-16 09:18:46 +00:00
bin bin/khronos-update.py: add upstream for vulkan_directfb.h & vulkan_screen.h 2021-09-19 11:00:32 +01:00
build-support
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docs gallium: add PIPE_CAP_PREFER_BACK_BUFFER_REUSE 2021-09-29 08:14:57 +00:00
include gallium: add PIPE_CAP_PREFER_BACK_BUFFER_REUSE 2021-09-29 08:14:57 +00:00
src loader/dri3: avoid reusing the same back buffer with DRI_PRIME 2021-09-29 08:14:57 +00:00
subprojects util: Perfetto SDK v15.0 2021-05-07 13:41:38 +00:00
.dir-locals.el
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.editorconfig editorconfig: Use 3-space tabs for .rst 2021-06-22 17:37:55 +00:00
.gitignore intel/tools: Add unit tests for assembler 2019-05-07 14:33:48 -07:00
.gitlab-ci.yml ci: Uprev deqp-runner to 0.9.0 2021-09-29 05:47:55 +00:00
.mailmap mailmap: Add two more lines for Alyssa Rosenzweig 2021-07-12 23:45:34 +00:00
.travis.yml travis: Download XQuartz from GitHub. 2021-05-29 10:25:16 +00:00
README.rst docs: promote #dri-devel on oftc over freenode 2021-05-24 09:21:48 +00:00
REVIEWERS Fix up leftover "state_trackers" references to "frontends" 2021-07-02 07:35:05 +00:00
VERSION VERSION: bump version for 21.3 development cycle 2021-07-14 10:22:12 -07:00
meson.build meson: introduce option vmware-mks-stats controlling the instrumentations of gallium svga driver 2021-09-21 00:07:40 +00:00
meson_options.txt meson: introduce option vmware-mks-stats controlling the instrumentations of gallium svga driver 2021-09-21 00:07:40 +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.