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d89bfb1ff7
Reorganize the code to make clearer all the lowering cases:
(a) Single invocation workgroup. Index and IDs are all zero.
(b) Local ID provided by hardware.
(c) Local Index provided by the hardware. Depending on the case this
might not be the final local index, e.g. heuristics for tile.
(d) Neither provided by the hardware.
Case (c) is new and supported by Mesh/Task shaders. At the moment the
nir_lower_compute_system_values handle lowering of LocalID for
Task/Mesh, but a later patch will flip that on ANV.
This will make the Task/Mesh use the same lowering as Compute shaders.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29828>
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