Sometimes SM1-3 shaders contain write masks that exceed the
signature element masks. That happens because SM1-3 shaders do not
have a concept of signature and signature masks, and OTOH aren't
always able to express any given write mask.
In VSIR we don't want to deal with I/O register masks exceeding the
corresponding signature element mask or usage mask, because, for
instance, for higher shader models it can complicate dealing with
DCL_INDEX_RANGE. In order to have uniform rules for all shader
models we normalise masks coming from SM1-3 shaders.
We don't do that normalisation when disassembling, in order to
preserve the expected output.
The previous names "not normalised" and "fully normalised" have meanings
which are likely to change with time. OTOH including a description of the
normalisation level in the enumerant seems excessive. Relating
normalisation levels to shader model versions might be a reasonable
compromise.
Most I/O registers are already described by the shader signatures.
The registers that are not do not have any property other then
being used by the program or not, so they can be collectively
described with a bitmap.
Instead of using DCL_INPUT.
The main goal here is to eventually get rid of the I/O
declaration instructions. A positive side effect is that we don't
add a useless barrier to shaders which have a DCL_INPUT instruction
in the patch constant phase but don't actually read OUTCONTROLPOINT
registers.
