Re: [PATCH v3 5/6] d3d9: Don't upload unused system memory vertex buffers.

[Henri Verbeet]

On Wed, 27 Feb 2019 at 21:01, Matteo Bruni  wrote:
> - decl = wined3d_vertex_declaration_get_parent(wined3d_decl);
> - if (!decl->elements)
> - {
> -
>    map = 1;
> - }

Can that happen in d3d9?
> - else
> - {
> -
>    map = 0;
> -
>    if (FAILED(convert_to_wined3d_declaration(decl->elements, &elements, &count)))
> -
>        return;
> -
>    for (i = 0; i < count; ++i)
> -
>        map |= 1u << elements[i].input_slot;
> -
>    heap_free(elements);
> - }

You don't need to convert the elements for that, the d3d9 elements
have a "Stream" field too. If you wanted to be efficient about it, you
could create the declaration's stream map on declaration creation.