Fix T39781: Autosmooth feature: erroneously showing hidden vertices' normals too when in "vertex per face" display

So, turned out after all we need a foreachmapped helper for loops as well... :/

CDDM and EBDM were reasonably simple, but I fought hours with CCGDM (subsurf) to find only a
bad working solution (see D478). So I fallback to a code similar to CDDM one.
Probably not nice for performances, but loops and subsurf are not matching well...

Reviewers: campbellbarton

CC: brecht

Differential Revision: https://developer.blender.org/D478

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_DerivedMesh.h b/source/blender/blenkernel/BKE_DerivedMesh.h
index a9e78b79159..60920aa1bb5 100644
--- a/source/blender/blenkernel/BKE_DerivedMesh.h
+++ b/source/blender/blenkernel/BKE_DerivedMesh.h
@@ -156,7 +156,7 @@ typedef enum DMDrawFlag {
 
 typedef enum DMForeachFlag {
 	DM_FOREACH_NOP = 0,
-	DM_FOREACH_USE_NORMAL = (1 << 0),  /* foreachMappedVert, foreachMappedFaceCenter */
+	DM_FOREACH_USE_NORMAL = (1 << 0),  /* foreachMappedVert, foreachMappedLoop, foreachMappedFaceCenter */
 } DMForeachFlag;
 
 typedef enum DMDirtyFlag {
@@ -309,6 +309,15 @@ struct DerivedMesh {
 	                                       const float v0co[3], const float v1co[3]),
 	                          void *userData);
 
+	/** Iterate over each mapped loop in the derived mesh, calling the given function
+	 * with the original loop index and the mapped loops's new coordinate and normal.
+	 */
+	void (*foreachMappedLoop)(DerivedMesh *dm,
+	                          void (*func)(void *userData, int vertex_index, int face_index,
+	                                       const float co[3], const float no[3]),
+	                          void *userData,
+	                          DMForeachFlag flag);
+
 	/** Iterate over each mapped face in the derived mesh, calling the
 	 * given function with the original face and the mapped face's (or
 	 * faces') center and normal.