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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
e7615a612f
VK_KHR_maintenance5 adds two new optional formats: - VK_FORMAT_A1B5G5R5_UNORM_PACK16_KHR - VK_FORMAT_A8_UNORM_KHR The former we support natively, the latter we don't. We could try to implement A8 with some effort by mapping it to R8 with a 000X swizzle but that alone won't be enough, some issues we would have to solve include: - Border colors won't work because the texture shader state swizzle also applies to these, so our 000X swizzle would mess things up for them and since we don't know the format used with the sampler in the general case, we would have always have to create two samplers internally, one adequate for A8 and one for the rest of formats and choose one or the other at run time. - We would have to convert the A8 format to a compatible R8 format but most of the transfer operations. This should be fairly trivial since we already have infrastructure for this. - At rendering time we would need to ensure we make our writes from the alpha channel. This would probably require that we use the color_fmt from the fs_key to swizzle color writes in shaders. - We would probably also need to special case the format for color clears, etc So for now, we don't support it. Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29643> |
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`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://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.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://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.