wined3d: Introduce wined3d_texture_get_sub_resource_parent().

dlls/wined3d/texture.c

@@ -1485,6 +1485,21 @@ HRESULT CDECL wined3d_texture_update_overlay(struct wined3d_texture *texture, un
     return WINED3D_OK;
 }
 
+void * CDECL wined3d_texture_get_sub_resource_parent(struct wined3d_texture *texture, unsigned int sub_resource_idx)
+{
+    unsigned int sub_count = texture->level_count * texture->layer_count;
+
+    TRACE("texture %p, sub_resource_idx %u.\n", texture, sub_resource_idx);
+
+    if (sub_resource_idx >= sub_count)
+    {
+        WARN("sub_resource_idx %u >= sub_count %u.\n", sub_resource_idx, sub_count);
+        return NULL;
+    }
+
+    return texture->sub_resources[sub_resource_idx].resource->parent;
+}
+
 HRESULT CDECL wined3d_texture_create(struct wined3d_device *device, const struct wined3d_resource_desc *desc,
         UINT level_count, DWORD flags, const struct wined3d_sub_resource_data *data, void *parent,
         const struct wined3d_parent_ops *parent_ops, struct wined3d_texture **texture)

dlls/wined3d/wined3d.spec

@@ -251,6 +251,7 @@
 @ cdecl wined3d_texture_get_pitch(ptr long ptr ptr)
 @ cdecl wined3d_texture_get_resource(ptr)
 @ cdecl wined3d_texture_get_sub_resource(ptr long)
+@ cdecl wined3d_texture_get_sub_resource_parent(ptr long)
 @ cdecl wined3d_texture_incref(ptr)
 @ cdecl wined3d_texture_preload(ptr)
 @ cdecl wined3d_texture_release_dc(ptr long ptr)

include/wine/wined3d.h

@@ -2447,6 +2447,7 @@ void __cdecl wined3d_texture_get_pitch(const struct wined3d_texture *texture,
 struct wined3d_resource * __cdecl wined3d_texture_get_resource(struct wined3d_texture *texture);
 struct wined3d_resource * __cdecl wined3d_texture_get_sub_resource(const struct wined3d_texture *texture,
         UINT sub_resource_idx);
+void * __cdecl wined3d_texture_get_sub_resource_parent(struct wined3d_texture *texture, unsigned int sub_resource_idx);
 ULONG __cdecl wined3d_texture_incref(struct wined3d_texture *texture);
 void __cdecl wined3d_texture_preload(struct wined3d_texture *texture);
 HRESULT __cdecl wined3d_texture_release_dc(struct wined3d_texture *texture, unsigned int sub_resource_idx, HDC dc);