The SPIR-V backend may emit SPIR-V 1.3 if Vulkan 1.1 is available.
Some extensions which provide wave op instructions are available in
SPIR-V 1.0, but these are not sufficient to implement all Shader Model 6
wave op intrinsics. SPIR-V 1.3 has all of the required instructions, but
does not support reading from a quad at a non-constant (but uniform) lane
index, so it may later prove necessary to introduce a Vulkan 1.2
environment.
Type size_t is used in the file without importing any header which
defines it. This only works when the translation unit includes one of
the appropriate headers anyway or when the appropriate header is included
internally by other standard C headers; none of those strategies should
be relied upon.
d3dcompiler and d3dx9 versions before 42 don't emit this error; this will be
necessary to emulate that behaviour.
Other warnings exist that are introduced in different d3dcompiler versions,
although there are not very many distinct HLSL warnings to begin with.
We could of course group all these together under a single compiler option, but
I find that using separate top-level options is unilaterally friendlier to an
API consumer, and simpler to implement as well. It also in some sense maps
conceptually to e.g. "-Wno-implicit-conversion".
There doesn't seem much point in separating these. Pretty much all of
vkd3d (eventually) includes vkd3d_debug.h, and vkd3d_debug.h includes
vkd3d_common.h because it uses VKD3D_PRINTF_FUNC. The separation also
makes it inconvenient to use the debug macros in vkd3d_common.h.
