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kk: Track fragment helper status since Metal does not correctly demote them

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When discarding a fragment in Metal, it will not be demoted to helper. At
least for Apple Silicon M1 and M2. Call nir_lower_is_helper_invocation to
work around this.

Reviewed-by: Arcady Goldmints-Orlov <arcady@lunarg.com>
Signed-off-by: Aitor Camacho <aitor@lunarg.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38590>
This commit is contained in:
Aitor Camacho
2025-11-22 21:10:55 +09:00
committed by Marge Bot
parent a015397c52
commit 67d05f71e9
2 changed files with 23 additions and 9 deletions
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docs/drivers/kosmickrisp/workarounds.rst
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@@ -49,6 +49,22 @@ info on what was updated.
Workarounds
===========
KK_WORKAROUND_4
---------------
| macOS version: 26.0.1
| Metal ticket: FB21124215 (@aitor)
| Metal ticket status: Waiting resolution
| CTS test failure: ``dEQP-VK.draw.renderpass.shader_invocation.helper_invocation*`` and few others
| Comments:
``simd_is_helper_thread()`` will always return true if the shader was started
as a non-helper thread, even after ``discard_fragment()`` is called. The
workaround is to have a variable tracking this state and update it when the
fragment is discarded. This issue is present in M1 and M2 chips.
| Log:
| 2025-11-22: Workaround implemented and reported to Apple
KK_WORKAROUND_3
---------------
| macOS version: 15.4.x