fix [#35795] Edge split modifier do not show result in viewport with curves.

caused by recent changes in normal calculation, however curves were not being very smart about calculating modifiers (calling unneeded re-tessellation for every modifier)

1 files changed, 15 insertions, 6 deletions

diff --git a/source/blender/blenkernel/intern/displist.c b/source/blender/blenkernel/intern/displist.c
index f3de4001dea..ed8d7bd3d2f 100644
--- a/source/blender/blenkernel/intern/displist.c
+++ b/source/blender/blenkernel/intern/displist.c
@@ -976,7 +976,6 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *dispba
 					dm = tdm;
 
 					CDDM_apply_vert_coords(dm, vertCos);
-					CDDM_calc_normals_mapping(dm);
 				}
 			}
 			else {
@@ -989,8 +988,6 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *dispba
 				}
 
 				dm = CDDM_from_curve_displist(ob, dispbase);
-
-				CDDM_calc_normals_mapping(dm);
 			}
 
 			if (vertCos) {
@@ -1001,7 +998,8 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *dispba
 
 			if (useCache)
 				appf |= MOD_APPLY_USECACHE;
-			ndm = mti->applyModifier(md, ob, dm, appf);
+
+			ndm = modwrap_applyModifier(md, ob, dm, appf);
 
 			if (ndm) {
 				/* Modifier returned a new derived mesh */
@@ -1031,8 +1029,19 @@ static void curve_calc_modifiers_post(Scene *scene, Object *ob, ListBase *dispba
 	}
 
 	if (derivedFinal) {
-		if (dm)
-			DM_ensure_tessface(dm);  /* needed for drawing */
+		if (dm) {
+			/* see: mesh_calc_modifiers */
+			if (dm->getNumTessFaces(dm) == 0) {
+				dm->recalcTessellation(dm);
+			}
+			/* Even if tessellation is not needed, some modifiers might have modified CD layers
+			 * (like mloopcol or mloopuv), hence we have to update those. */
+			else if (dm->dirty & DM_DIRTY_TESS_CDLAYERS) {
+				DM_update_tessface_data(dm);
+			}
+
+			CDDM_calc_normals_mapping_ex(dm, (dm->dirty & DM_DIRTY_NORMALS) ? false : true);
+		}
 		(*derivedFinal) = dm;
 	}