d3d11: Add support for mapping 3D textures.

dlls/d3d11/d3d11_private.h

@@ -133,6 +133,7 @@ struct d3d_texture3d
 
 HRESULT d3d_texture3d_create(struct d3d_device *device, const D3D11_TEXTURE3D_DESC *desc,
         const D3D11_SUBRESOURCE_DATA *data, struct d3d_texture3d **texture) DECLSPEC_HIDDEN;
+struct d3d_texture3d *unsafe_impl_from_ID3D11Texture3D(ID3D11Texture3D *iface) DECLSPEC_HIDDEN;
 
 /* ID3D11Buffer, ID3D10Buffer */
 struct d3d_buffer

dlls/d3d11/texture.c

@@ -887,6 +887,14 @@ static const struct ID3D10Texture3DVtbl d3d10_texture3d_vtbl =
     d3d10_texture3d_GetDesc,
 };
 
+struct d3d_texture3d *unsafe_impl_from_ID3D11Texture3D(ID3D11Texture3D *iface)
+{
+    if (!iface)
+        return NULL;
+    assert(iface->lpVtbl == &d3d11_texture3d_vtbl);
+    return impl_from_ID3D11Texture3D(iface);
+}
+
 static const struct wined3d_parent_ops d3d_texture3d_wined3d_parent_ops =
 {
     d3d_texture3d_wined3d_object_released,

dlls/d3d11/utils.c

@@ -518,6 +518,10 @@ struct wined3d_resource *wined3d_resource_from_d3d11_resource(ID3D11Resource *re
             return wined3d_texture_get_resource(unsafe_impl_from_ID3D11Texture2D(
                     (ID3D11Texture2D *)resource)->wined3d_texture);
 
+        case D3D11_RESOURCE_DIMENSION_TEXTURE3D:
+            return wined3d_texture_get_resource(unsafe_impl_from_ID3D11Texture3D(
+                    (ID3D11Texture3D *)resource)->wined3d_texture);
+
         default:
             FIXME("Unhandled resource dimension %#x.\n", dimension);
             return NULL;