d3dx9_36: Implement D3DXCreateMesh and initial ID3DXMesh methods. (try 3)

[Henri Verbeet]

On 15 September 2010 01:55, Misha Koshelev <misha680 at gmail.com> wrote:
> +    while (count < MAX_FVF_DECL_SIZE && (count == 0 || declaration[count-1].Stream != 0xFF))
> +    {
> +        count++;
> +    }
...and similarly you'd want to use D3DXGetDeclLength() here, though I
wonder if implementing DrawSubset() isn't going to require creating a
vertex declaration anyway.

> +    if (!ref)
> +    {
> +        if (This->index_buffer) IDirect3DIndexBuffer9_Release(This->index_buffer);
> +        if (This->vertex_buffer) IDirect3DVertexBuffer9_Release(This->vertex_buffer);
> +        if (This->device) IDirect3DDevice9_Release(This->device);
> +        HeapFree(GetProcessHeap(), 0, This);
> +    }
In which cases can these be NULL?