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809a81ec3a
For texturing, we map alpha formats to the corresponding red format,
as many alpha formats are outright missing, and red is more efficient
when sampling anyway.
When rendering to A8_UNORM, we use that format directly, so the image
gets the shader output's .a/.w channel, rather than the .r/.x channel.
All other A* formats are non-renderable, so we can't do much and just
mark them as unsupported for rendering. Fortunately, GL only requires
rendering to A8_UNORM, so that works out.
According to Andre Heider and Timur Kristóf, this fixes font rendering
in Witcher 1 (via nine). Andre also reported that it fixes Unigine
Heaven (presumably via nine).
v2: Use the same swizzle for both sampler views and "render targets".
BLORP expects the read swizzle, and will take the inverse when
setting up the destination swizzle (and actually applying it in
the shaders). We ignore the format swizzle when setting up normal
rendering SURFACE_STATEs, which is necessary because it would be
an illegal shader channel select combination. Thanks to Jason
Ekstrand for pointing out that BLORP took an inverse swizzle.
Tested-by: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Andre Heider <a.heider@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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| bin | ||
| build-support | ||
| docs | ||
| doxygen | ||
| include | ||
| m4 | ||
| scons | ||
| scripts | ||
| src | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .mailmap | ||
| .travis.yml | ||
| Android.common.mk | ||
| Android.mk | ||
| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| meson.build | ||
| meson_options.txt | ||
| README.rst | ||
| REVIEWERS | ||
| SConstruct | ||
| VERSION | ||
`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.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <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 `Freenode's #dri-devel <irc://chat.freenode.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.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.