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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
8027cc9975
Midgard ALUs can operate in one of four modes: vec2 64-bit, vec4 32-bit, vec8 16-bit, or vec16 8-bit. Our compiler (and indeed, any OpenGL ES shader) only uses 32-bit (and eventually vec4 16-bit) modes in normal circumstances. Nevertheless, the other modes do exist and are easily accessible through OpenCL; they also come up in cases like blend shaders. While we have had minimal support for decoding 8-bit/64-bit modes, we did so pretending they were vec4 in each case; 16-bit registers had a synthetically duplicated register file to separate lo/hi halves, etc. This works for GL, but it doesn't map to what the hardware is -actually- doing, which can cause some headscratchingly bizarre disassemblies from OpenCL. So, we dive in the deep end and support these other modes natively in the disassembler, using absurdly long masks/swizzles, since the hardware is considerably more flexible than what was exposed before. Outside of some fixed routines for blending, none of the above is supported in the compiler yet. But it's better to have it in the ISA definitions and disassembler than not, for future use if nothing else. Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> |
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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.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.