a7xx introduced support for aliasing render target components using
alias.rt. This allows components to be bound to uniform (const or
immediate) values in the preamble:
alias.rt.f32.0 rt0.y, c0.x
alias.rt.f32.0 rt1.z, (1.000000)
This aliases the 2nd component of RT0 to c0.x and the 3rd component of
RT1 to the immediate 1.0. All components of all 8 render targets can be
aliased.
In addition to using alias.rt, the hardware needs to be informed about
which render target components are being aliased using the
SP_PS_ALIASED_COMPONENTS{_CONTROL} registers. This commit implements
those registers.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31222>
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