Mesh: Add versioning in 3.0 for vertex normal refactor

This tags all meshes from the future 3.1 version dirty,
since normals aren't "implicitly" read as part of `MVert`
anymore after rBcfa53e0fbeed7178.

Differential Revision: https://developer.blender.org/D13856

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.c b/source/blender/blenloader/intern/versioning_300.c
index 940a10a9e91..c9237a7325c 100644
--- a/source/blender/blenloader/intern/versioning_300.c
+++ b/source/blender/blenloader/intern/versioning_300.c
@@ -43,6 +43,7 @@
 #include "DNA_lineart_types.h"
 #include "DNA_listBase.h"
 #include "DNA_material_types.h"
+#include "DNA_mesh_types.h"
 #include "DNA_modifier_types.h"
 #include "DNA_text_types.h"
 #include "DNA_workspace_types.h"
@@ -2369,6 +2370,15 @@ void blo_do_versions_300(FileData *fd, Library *UNUSED(lib), Main *bmain)
     }
   }
 
+  /* Mesh vertex normals are stored differently after 3.1 (see D12770). This causes an incorrect
+   * viewport display when smooth faces are loaded from the future version, so tag normals dirty
+   * on all meshes from future versions. */
+  if (!DNA_struct_elem_find(fd->filesdna, "MVert", "short", "no[3]")) {
+    LISTBASE_FOREACH (Mesh *, mesh, &bmain->meshes) {
+      mesh->runtime.cd_dirty_vert |= CD_MASK_NORMAL;
+    }
+  }
+
   /**
    * Versioning code until next subversion bump goes here.
    *