This struct is required for handling both whole-variable resources for
SM < 5 and single-component resources for SM 5 in the same way, when
writting the RDEF block and resource declarations within the shader.
After lowering the derefs path to a single offset node, there was no way
of knowing the type of the referenced part of the variable. This little
modification allows to avoid having to pass the data type everywhere and
it is required for supporting instructions that reference objects
components within struct types.
Since deref->data_type allows us to retrieve the type of the deref,
deref->offset_regset is no longer necessary.
Store it in the shader_desc, and declare temps from that when compiling SPIR-V,
instead of parsing dcl_instructions.
As part of this change, we declare a single, global temps array (with Private
scope instead of Function) which is as large as the maximum of all dcl_temps
instructions. It is not clear to me whether this will improve, hurt, or have no
significant effect on the lower-level compiler. An alternative is to still
redeclare a new temps array every time (although still with a smaller size).
Instead of modifying the swizzle after calling sm4_src_from_node().
This fixes the case where sm4_src_from_node() returns an immediate constant.
Fixes: a471c5567acaf467292cdfb9c061e2213b348805
