This only affects clip and cull distances. The HLSL compiler emits these using
dcl_input, but the previous shader (vertex or TES) will write them as a SPIRV
builtin, and hence we want to read this as a SPIRV builtin as well.
This fixes validation errors in Wine's test_clip_distance().
In Shader Model 6 each signature element can span a range of register
indices, or 'rows', and system values do not share a register index with
non-system values. Inputs and outputs are referenced by element index
instead of register index. This patch merges multiple signature elements
into a single element under the following conditions:
- The register index in a load or store is specified dynamically by
including a relative address parameter with a base register index. The
dcl_index_range instruction is used to identify these.
- A register declaration is split across multiple elements which declare
different components of the register.
- A patch constant function writes tessellation factors. These are an
array in SPIR-V, but in SM 5.x each factor is declared as a separate
register, and these are dynamically indexed by the fork/join instance
id. Elimination of multiple fork/join phases converts the indices to
constants, but merging the signature elements into a single arrayed
element matches the SPIR-V output.
All references to input/output register indices are converted to element
indices. If a relative address is present, the element index is moved up
a slot so it cannot be confused with a constant offset. Existing code
only handles register index relative addressing for tessellation factors.
This patch adds generic support for it.
It is illegal to match a SPIR-V multisampled resource to a Vulkan resource which
is not multisampled. Vulkan considers a resource to be multisampled if its
sample count is greater than 1 (and SPIR-V does not care about the sample count).
This fixes validation errors in the case where the sample count does actually
match the resource. In order to provide correct behaviour when there is a
mismatch, or when the sample count is missing, we will need yet another
additional interface. In the absence of that it seems best to provide a best
guess.
This fixes a validation error with the not-yet-committed merge request 135, when
the d3d11 runner is run through Wine with the Vulkan backend.
The SPIR-V backend will emit a default control point phase. Inserting
inputs into the IR allows handling of declarations via the usual path
instead of an ad hoc implementation which may not match later changes
to input handling.
In SPIR-V the address must include the invocation id, but in TPF it
is implicit. Move the register index up one slot and insert an
OUTPOINTID relative address.
