If vertex does not complete a primitive, it should not set the odd
flag which miss lead liveness check when culling is enabled.
For example, if odd flag is set regardless of complete flag, when
culling is enabled, 3 vertices of a triangle's init prim flag:
[0x00 0x04 0x01]
then after culling, this triangle has been culled, their prim flag:
[0x00 0x04 0x00]
the second vertex is miss treat as live because its odd flag (code
check prim_flag!=0 for liveness).
Fixes: 1bdeb961bd ("ac/nir/ngg: add gs culling")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8725
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22304>
c082cdacae