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9b32234726
Emulates SSBOS via global memory, real SSBO size and global base address
are stored in the descriptor. The size can be accessed using resbase,
the base address is parsed manualy from the descriptor by passing the
bindless base address into the shader via a driver UBO or const file.
nir_lower_ssbo is used to lower SSBO accesses to global memory when the
buffer size exceeds the limit. We also use it to insert bounds checks on
global memory. The final code for SSBO accesses looks like this:
if (@get_ssbo_size >= max_storage_buffer_range_bytes) {
if (offset < @get_ssbo_size) {
// global memory access using base (from resbase) + offset
} else {
// do nothing (stores) or return 0 (loads)
}
} else {
// original SSBO access
}
A new pass is added to lower @load_ssbo_address generated by
nir_lower_ssbo. We set native_offset=true for nir_lower_ssbo to make
sure it doesn't generate 64 bit address math. The new pass then
transforms @load/store_global into @load/store_global_ir3 passing the 32
bit offset from @load_ssbo_address.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Co-authored-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41477>
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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 $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ 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.