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frankea
53e4e8e796
MoltenVK and lavapipe leave the tessellation evaluation stage out of
subgroupSupportedStages, so the driver's shader validation refuses every
domain program that declares GroupNonUniform ("subgroup capability 61 is
unsupported for shader stage 4"). Gran Turismo 7 stops there on macOS at
the Used Car dealership.
The device target now records whether the tessellation evaluation stage
has subgroups. When it does not, tessellation evaluation programs outside
the mesh path get a host subgroup width of 1 and the one-lane rules that
vertex programs already use without vertex subgroups: the lane id is 0,
a ballot is the invocation's own bit, a shuffle returns the invocation's
value and an elect is true. Reads of other lanes still throw. Devices
with tessellation evaluation subgroups emit the same SPIR-V as before.
The request serialization moves to version 51.