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Allocation is unnecessary since all uniforms are
uploaded on every constant buffer change anyway.
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This moves construction of the mapping between VP outputs
and FP inputs into validation.
The map also contains slots for special outputs like clip
distance and point size, so we need to at least merge the
VP related and FP related parts on validation if we want
to support those.
Now we match every single FP input component with results
from the VP and leave those not read out of the map, or
replace those not written by 0 (xyz) or 1 (w).
The bitmap indicating linear interpolants is also filled,
and flat FP inputs are mapped in only after non-flat ones,
as is required.
Furthermore, we can save some space by only fetching VP
attrs we actually use, and avoid wasting any output regs
because of TGSI using less than 4 components.
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Use different buffers for immds, FP params, and VP params.
One has to map constant buffer indices in shader code to buffers
defined via CB_DEF. In principle, we could use more buffers so
we'd have to change the shader code less frequently.
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VP outputs that should be loadable in the FP are mapped to
interpolant indices by HPOS, COL0 etc.; of course HPOS is
always written, so the highest byte of 1988 is a bitmask that
selects which components of HPOS are used for interpolants,
i.e. the FP inputs in COL0 start at index POPCNT(1988[24:28]).
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