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tu: support KHR_8bit_storage

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Add basic KHR_8bit_storage support for Adreno 750 devices, for now enabling
the storageBuffer8BitAccess feature. A separate descriptor is provided for
8-bit storage access. The descriptor index is adjusted appropriately for
8-bit SSBO loads and stores.

The 8-bit SSBO loads cannot go through isam since that instruction isn't
able to handle those. The ldib and stib instruction encodings are a bit
peculiar but they match the blob's image buffer access through VK_FORMAT_R8
and the dedicated descriptor. These loads and stores do not work in
vectorized form, so they have to be scalarized. Additionally stores of
8-bit values have to clear up higher bits of those values.

8-bit truncation can leave higher bits as undefined. Zero-extension of
8-bit values has to use masking since the corresponding cov instruction
doesn't function as intended. 8-bit sign extension through cov from a
non-shared to a shared register also doesn't work, so an exception is
applied to avoid it.

Conversion of 8-bit values to and from floating-point values also doesn't
work with a straightforward cov instruction, instead the conversion has
to go through a 16-bit value.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/9979
Signed-off-by: Zan Dobersek <zdobersek@igalia.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28254>
This commit is contained in:
Zan Dobersek
2024-03-18 21:12:44 +01:00
committed by Marge Bot
parent c93a629f2c
commit 8a84e77b15
15 changed files with 169 additions and 24 deletions
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docs/features.txt
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@@ -448,7 +448,7 @@ Vulkan 1.1 -- all DONE: anv, lvp, nvk, radv, tu, vn
Vulkan 1.2 -- all DONE: anv, nvk, tu, vn
VK_KHR_8bit_storage DONE (anv, dzn, hasvk, lvp, nvk, radv, v3dv, vn)
VK_KHR_8bit_storage DONE (anv, dzn, hasvk, lvp, nvk, radv, tu/a750+, v3dv, vn)
VK_KHR_buffer_device_address DONE (anv, hasvk, lvp, nvk, panvk, radv, tu, v3dv, vn)
VK_KHR_create_renderpass2 DONE (anv, dzn, hasvk, lvp, nvk, radv, tu, v3dv, vn)
VK_KHR_depth_stencil_resolve DONE (anv, dzn, hasvk, lvp, nvk, radv, tu, v3dv, vn)