[PATCH vkd3d 2/5] vkd3d-shader: Implement parsing of root signature 1.1.

[Józef Kucia]

On Mon, Apr 15, 2019 at 4:55 PM Henri Verbeet <hverbeet at gmail.com> wrote:
> Do we really need shader_parse_descriptor_ranges() to be able to
> handle 1.1 signatures if we also have
> shader_parse_descriptor_ranges1()? Or alternatively, do we really need
> shader_parse_descriptor_ranges1()? Likewise for
> shader_parse_root_descriptor() and shader_parse_root_parameters().

It's implemented that way for
ID3D12RootSignatureDeserializer/vkd3d_create_root_signature_deserializer().
This implementation allows parsing root signature 1.1 directly to the
old D3D12_ROOT_SIGNATURE_DESC for ID3D12RootSignatureDeserializer
(without conversion). We could potentially re-implement
vkd3d_create_root_signature_deserializer() and convert root signature
1.1 to 1.0 after it is parsed. The conversion is implemented later in
this patch series.

>
> >  int vkd3d_shader_parse_root_signature(const struct vkd3d_shader_code *dxbc,
> >          struct vkd3d_root_signature_desc *root_signature)
> > +{
> > +    struct vkd3d_versioned_root_signature_desc desc = {.version = VKD3D_ROOT_SIGNATURE_VERSION_1_0};
> > +    int ret;
> > +
> > +    TRACE("dxbc {%p, %zu}, root_signature %p.\n", dxbc->code, dxbc->size, root_signature);
> > +
> > +    memset(root_signature, 0, sizeof(*root_signature));
> > +    if ((ret = parse_dxbc(dxbc->code, dxbc->size, rts0_handler, &desc)) < 0)
> > +    {
> > +        vkd3d_shader_free_versioned_root_signature(&desc);
> > +        return ret;
> > +    }
> > +
> > +    assert(desc.version == VKD3D_ROOT_SIGNATURE_VERSION_1_0);
> > +
> > +    *root_signature = desc.u.v_1_0;
> > +
> > +    return VKD3D_OK;
> > +}
> Since vkd3d_shader_parse_root_signature() isn't in any released
> version of libvkd3d-shader, could we just get rid of it?

Yes, it should be possible. I was considering to remove
vkd3d_shader_parse_root_signature() in a follow-up patch. I haven't
written the patch yet.