This is achieved by means of creating a variable storing zero,
loading every array element, comparing if the non-constant index
matches the index of that element at runtime, and in that case
store the corresponding element in the variable.
This seems to be the same strategy that the native compiler uses.
We are currently using &offset_node->loc when offset_node is NULL.
A NULL dereference of rel_offset can also happen if
hlsl_offset_from_deref() fails because the dereference is out of
bounds.
As the newly added documentation describes, this reroll serves two purposes:
* to allow shader parameters to be used for any target type (which allows using
parameters for things like Direct3D 8-9 alpha test),
* to allow the union in struct vkd3d_shader_parameter to contain types larger
than 32 bits (by specifying them indirectly through a pointer).
The idea is to start splitting the
HLSL IR -> d3dbc
translation into
HLSL IR -> vsir -> d3dbc
So hlsl_sm1_write is split into two functions, sm1_generate_vsir()
which should handle the first part and d3dbc_compile() which should
handle the second part.
This translation should be completed once the hlsl_ctx and entry_func
are no longer used in d3dbc_compile().
While on SM1 a register reservation reserves the whole size in
registers of the variable's data type, overlapping conflicts are only
checked up to the bind_count (used size) for each variable.
