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read-only mirror of https://gitlab.freedesktop.org/mesa/mesa
f9c835eb56
In the new Intel Iris driver, I am using Tim's new packed uniform storage system. It works great, with one caveat: our scalar compiler backend assumes that uniform offsets will be aligned to the underlying data type. For example, doubles must be 64-bit aligned, floats 32-bit, half-floats 16-bit, and so on. It does not need any other padding. Currently, _mesa_add_parameter aligns everything to 32-bit offsets, creating doubles that have an unaligned offset. This patch alters that code to align doubles to 64-bit offsets. This may be slightly less optimal for drivers which can support full packing, and allow reads from unaligned offsets at no penalty. We could make this extra alignment optional. However, it only comes into play when intermixing double and single precision uniforms. Doubles are already not too common, and intermixed values (floats then doubles) is probably even less common. At most, we burn a single 32-bit slot to the alignment, which is not that expensive. So, it doesn't seem worthwhile to add the extra complexity. Eventually, we'll likely want to update this code to allow half-float values to be packed tighter than 32-bit offsets. At that point, we'll probably want to revisit what drivers ultimately want, and add options. Acked-by: Timothy Arceri <tarceri@itsqueeze.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.