The current TPF validator enforces that for each register involved
in a DCL_INDEX_RANGE instruction there must be a signature element
for that register and the DCL_INDEX_RANGE write mask. This is an
excessively strong request, and causes some shaders from The Falconeer
to be invalidly rejected.
The excessively strong check was needed to avoid triggering a bug
in the I/O normaliser. Since that bug is now solved, the check
can be relaxed.
Since we have -Wswitch, this forces the developer to update all relevant
switches when an enum case is added.
Places where the default is just a FIXME are left alone.
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.
The alternative to adding the vsir_program->tess_output_primitive and
vsir_program->tess_partitioning fields would be to emit the vsir
DCL_TESSELLATOR_OUTPUT_PRIMITIVE and DCL_TESSELLATOR_PARTITIONING
instructions, like DXIL does, but I think that the preference is to store
these kind of data directly in the vsir_program.
