C++ API does not default-initialize struct members

[simco50]

The C++ API wraps around the C structs with InitHelper. This has a constructor so doing this does not zero-initialize the object.

ffx::DispatchDescUpscale upscale_desc  = {}; // Does not initialize the members!

This is quite unexpected to me. If a future update of the FFX SDK adds a member to any of the structs, it will be uninitialized unless explicitly set in the user code. Doing a memset(0) on the object is also not an option because the constructor or InitHelper fills in the header. Ideally the C++ wrapper should initialize all struct members.

[batcholi]

I think it DOES initialize all members, actually.