This node type is intended for use during parse-time.
While we parse an indexing expression such as `a[3]`, we don't know if
it will end up as part of an expression (in which case it must be folded
into a load) or it is for the lhs of a store (in which case it must be
folded into the store's deref). This node type is used to represent these accesses and no longer rely on building an `hlsl_ir_load` for each array index or struct record access.
`hlsl_ir_index` chains are lowered into derefs when (and if) they are used to specify the lhs of an assignment. All `hlsl_ir_index`es are lowered into `hlsl_ir_load`s with a compilation pass.
The changes introduced in these series allow to solve the problem with the return variable of function calls presented in !93, and to properly support assignment to matrix indexes, which is something we are not doing correctly.
Further patches (in my [index node](https://gitlab.winehq.org/fcasas/vkd3d/-/commits/index_node) branch) add support for indexing non-load expressions, such as `(a + b)[1]` and allowing to represent resource loads through `hlsl_ir_index`, so that `hlsl_ir_resource_store`s don't have to rely on `hlsl_ir_resource_load`s.
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v2: vkd3d-shader/hlsl: Support matrix indexing in the lhs.
vkd3d-shader/hlsl: Always load from a synthetic copy in add_load_component().
vkd3d-shader/hlsl: Remove add_load_index().
vkd3d-shader/hlsl: Use hlsl_ir_index for array and record access.
vkd3d-shader/hlsl: Introduce hlsl_ir_index.
tests: Test matrix indexing on the lhs.
tests: Test multiple calls to the same function in initializers.
https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/124
This concludes the series.
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v2: ddraw: Reimplement SetSurfaceDesc() by recreating the wined3d texture(s).
wined3d: Pass parent ops to wined3d_rendertarget_view_set_parent().
ddraw/tests: Add some tests for creating surfaces with user memory.
https://gitlab.winehq.org/wine/wine/-/merge_requests/2480
Fixes bug [53826](https://bugs.winehq.org/show_bug.cgi?id=53826).
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v19: ntdll: Set xattr in NtCreateFile if inferred and requested attributes don't match.
ntdll: Only infer hidden attribute from file name if xattr is not present.
ntdll: Handle hidden file names inside get_file_info instead of after it.
ntdll: Do not open-code hidden file handling in get_dir_data_entry.
ntdll/tests: Add test for file attributes of files with names beginning with a dot.
https://gitlab.winehq.org/wine/wine/-/merge_requests/1148