- work-in-progress: subsurf level 0 now just acts like a regular mesh,

before it would follow subsurf code path by creating fake displistmesh,
   etc... kinda fun for testing but just annoying now.
 - change to creasing behavior, to make sure that with full creasing effect
   is just simple subdivision.

source/blender/blenkernel/BKE_subsurf.h

@@ -39,9 +39,6 @@ struct EditMesh;
 struct DerivedMesh *subsurf_make_derived_from_editmesh(struct EditMesh *em, int subdivLevels, short type, struct DerivedMesh *oldDerived);
 struct DerivedMesh *subsurf_make_derived_from_mesh(struct Mesh *me, int subdivLevels);
 
-struct DerivedMesh *subsurf_ccg_make_derived_from_editmesh(struct EditMesh *em, int useFlatSubdiv, int subdivLevels, struct DerivedMesh *oldDerived);
-struct DerivedMesh *subsurf_ccg_make_derived_from_mesh(struct Mesh *me, int useFlatSubdiv, int subdivLevels);
-
 void subsurf_calculate_limit_positions(Mesh *me, float (*positions_r)[3]);
 
 #endif

source/blender/blenkernel/intern/CCGSubSurf.c

@@ -1131,7 +1131,7 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 		CCGVert *v = effectedV[ptrIdx];
 		void *co = VERT_getCo(v, curLvl);
 		void *nCo = VERT_getCo(v, nextLvl);
-		int sharpCount = 0;
+		int sharpCount = 0, allSharp = 1;
 		float avgSharpness = 0.0;
 
 		for (i=0; i<v->numEdges; i++) {
@@ -1141,6 +1141,8 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 			if (sharpness!=0.0f) {
 				sharpCount++;
 				avgSharpness += sharpness;
+			} else {
+				allSharp = 0;
 			}
 		}
 
@@ -1206,7 +1208,7 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 
 			ss->meshIFC.vertDataMulN(ss->meshData, q, (float) 1/sharpCount);
 
-			if (sharpCount!=2) {
+			if (sharpCount!=2 || allSharp) {
 					// q = q + (co-q)*avgSharpness
 				ss->meshIFC.vertDataCopy(ss->meshData, r, co);
 				ss->meshIFC.vertDataSub(ss->meshData, r, q);
@@ -1409,7 +1411,7 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 			CCGVert *v = (CCGVert*) effectedV[ptrIdx];
 			void *co = VERT_getCo(v, curLvl);
 			void *nCo = VERT_getCo(v, nextLvl);
-			int sharpCount = 0;
+			int sharpCount = 0, allSharp = 1;
 			float avgSharpness = 0.0;
 
 			for (i=0; i<v->numEdges; i++) {
@@ -1419,6 +1421,8 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 				if (sharpness!=0.0f) {
 					sharpCount++;
 					avgSharpness += sharpness;
+				} else {
+					allSharp = 0;
 				}
 			}
 
@@ -1485,7 +1489,7 @@ static void ccgSubSurf__sync(CCGSubSurf *ss) {
 
 				ss->meshIFC.vertDataMulN(ss->meshData, q, (float) 1/sharpCount);
 
-				if (sharpCount!=2) {
+				if (sharpCount!=2 || allSharp) {
 						// q = q + (co-q)*avgSharpness
 					ss->meshIFC.vertDataCopy(ss->meshData, r, co);
 					ss->meshIFC.vertDataSub(ss->meshData, r, q);

source/blender/blenkernel/intern/DerivedMesh.c

@@ -969,7 +969,7 @@ static void build_mesh_data(Object *ob, int inEditMode)
 			if(eff->type==EFF_WAVE) makeDispList(ob);
 		}
 	}
-	if(mesh_uses_displist(me)) {
+	if(me->flag&ME_SUBSURF) {
 		if(inEditMode && !G.editMesh->derived) {
 			makeDispList(ob);
 		} else if (!inEditMode && !me->derived) {
@@ -986,8 +986,7 @@ DerivedMesh *mesh_get_derived(Object *ob)
 {
 	Mesh *me= ob->data;
 
-	if (mesh_uses_displist(me)) {
+	if ((me->flag&ME_SUBSURF) && me->subdiv) {
-
 		if(G.obedit && me==G.obedit->data) {
 			build_mesh_data(ob, 1);
 			return G.editMesh->derived;
@@ -1004,8 +1003,7 @@ DerivedMesh *mesh_get_derived_render(Object *ob, int *needsFree)
 {
 	Mesh *me= ob->data;
 
-	if (mesh_uses_displist(me)) {
+	if ((me->flag&ME_SUBSURF) && me->subdivr) {
-			// XXX, assumes was created earlier... is this for sure?
 		if (me->subdiv==me->subdivr) {
 			*needsFree = 0;
 			if(G.obedit && me==G.obedit->data) {
@@ -1013,13 +1011,13 @@ DerivedMesh *mesh_get_derived_render(Object *ob, int *needsFree)
 			} else {
 				return me->derived;
 			}
+		} 
+
+		*needsFree = 1;
+		if(G.obedit && me==G.obedit->data) {
+			return subsurf_make_derived_from_editmesh(G.editMesh, me->subdivr, me->subsurftype, NULL);
 		} else {
-			*needsFree = 1;
+			return subsurf_make_derived_from_mesh(me, me->subdivr);
-			if(G.obedit && me==G.obedit->data) {
-				return subsurf_make_derived_from_editmesh(G.editMesh, me->subdivr, me->subsurftype, NULL);
-			} else {
-				return subsurf_make_derived_from_mesh(me, me->subdivr);
-			}
 		}
 	}
 

source/blender/blenkernel/intern/mesh.c

@@ -1203,7 +1203,7 @@ void mcol_to_tface(Mesh *me, int freedata)
 }
 
 int mesh_uses_displist(Mesh *me) {
-	return (me->flag&ME_SUBSURF);
+	return (me->flag&ME_SUBSURF) && me->subdiv;
 }
 
 void mesh_calculate_vertex_normals(Mesh *me)

source/blender/blenkernel/intern/subsurf.c

@@ -1082,37 +1082,6 @@ static DispListMesh *subsurf_subdivide_to_displistmesh(HyperMesh *hme, short sub
 	return dlm;
 }
 
-DerivedMesh *subsurf_make_derived_from_editmesh(EditMesh *em, int subdivLevels, short type, DerivedMesh *oldDerived) {
-	if (subdivLevels<1) {
-		if (oldDerived) {
-			oldDerived->release(oldDerived);
-		}
-		return derivedmesh_from_displistmesh(em, displistmesh_from_editmesh(em));
-	} else if (type==ME_CCG_SUBSURF || type==ME_SIMPLE_SUBSURF) {
-		return subsurf_ccg_make_derived_from_editmesh(em, type==ME_SIMPLE_SUBSURF, subdivLevels, oldDerived);
-	} else {
-		HyperMesh *hme= hypermesh_from_editmesh(em, subdivLevels);
-	
-		if (oldDerived) {
-			oldDerived->release(oldDerived);
-		}
-
-		return derivedmesh_from_displistmesh(em, subsurf_subdivide_to_displistmesh(hme, subdivLevels, type));
-	}
-}
-
-DerivedMesh *subsurf_make_derived_from_mesh(Mesh *me, int subdivLevels) {
-	if (subdivLevels<1) {
-		return derivedmesh_from_displistmesh(NULL, displistmesh_from_mesh(me, NULL));
-	} else if (me->subsurftype==ME_CCG_SUBSURF || me->subsurftype==ME_SIMPLE_SUBSURF) {
-		return subsurf_ccg_make_derived_from_mesh(me, me->subsurftype==ME_SIMPLE_SUBSURF, subdivLevels);
-	} else {
-		HyperMesh *hme= hypermesh_from_mesh(me, subdivLevels);
-
-		return derivedmesh_from_displistmesh(NULL, subsurf_subdivide_to_displistmesh(hme, subdivLevels, me->subsurftype));
-	}
-}
-
 	// editarmature.c
 void subsurf_calculate_limit_positions(Mesh *me, float (*positions_r)[3]) 
 {

source/blender/blenkernel/intern/subsurf_ccg.c

@@ -988,7 +988,7 @@ static CCGDerivedMesh *getCCGDerivedMesh(SubSurf *ss) {
 
 /***/
 
-DerivedMesh *subsurf_ccg_make_derived_from_editmesh(EditMesh *em, int useFlatSubdiv, int subdivLevels, DerivedMesh *oldDerived) {
+DerivedMesh *subsurf_make_derived_from_editmesh(EditMesh *em, int subdivLevels, short type, DerivedMesh *oldDerived) {
 	CCGDerivedMesh *ccgdm;
 
 	if (oldDerived) {
@@ -998,12 +998,13 @@ DerivedMesh *subsurf_ccg_make_derived_from_editmesh(EditMesh *em, int useFlatSub
 		ccgdm = getCCGDerivedMesh(ss);
 	}
 
-	subSurf_sync(ccgdm->ss, useFlatSubdiv);
+	subSurf_sync(ccgdm->ss, type==ME_SIMPLE_SUBSURF);
 
 	return (DerivedMesh*) ccgdm;
 }
 
-DerivedMesh *subsurf_ccg_make_derived_from_mesh(Mesh *me, int useFlatSubdiv, int subdivLevels) {
+DerivedMesh *subsurf_make_derived_from_mesh(Mesh *me, int subdivLevels) {
+	int useFlatSubdiv = me->subsurftype==ME_SIMPLE_SUBSURF;
 	SubSurf *ss = subSurf_fromMesh(me, useFlatSubdiv, subdivLevels);
 	DispListMesh *dlm;
 
@@ -1015,3 +1016,4 @@ DerivedMesh *subsurf_ccg_make_derived_from_mesh(Mesh *me, int useFlatSubdiv, int
 	
 	return derivedmesh_from_displistmesh(NULL, dlm);
 }
+

source/blender/python/api2_2x/NMesh.c

@@ -2164,7 +2164,7 @@ static PyObject *M_NMesh_GetRawFromObject( PyObject * self, PyObject * args )
 		Mesh *me = ( Mesh * ) ob->data;
 		DispList *dl;
 
-		if( mesh_uses_displist( me ) ) {
+		if( mesh_uses_displist( me )) {
 			DerivedMesh *dm = mesh_get_derived(ob);
 			DispListMesh *dlm = dm->convertToDispListMesh(dm);
 			nmesh = new_NMesh_internal( me, dlm, NULL );

source/blender/renderconverter/intern/convertBlenderScene.c

@@ -1344,7 +1344,7 @@ static void init_render_mesh(Object *ob)
 	
 	/* we do this before deform */
 	if(need_orco) {
-		if (mesh_uses_displist(me)) 
+		if ((me->flag&ME_SUBSURF) && me->subdivr) 
 			make_orco_displist_mesh(ob, me->subdivr);
 		else
 			make_orco_mesh(me);
@@ -1353,7 +1353,7 @@ static void init_render_mesh(Object *ob)
 	/* after orco, because this changes mesh vertices (too) */
 	do_puno= mesh_modifier(ob, 's');
 	
-	if (mesh_uses_displist(me)) {
+	if ((me->flag&ME_SUBSURF) && me->subdivr) {
 		int needsFree;
 		DerivedMesh *dm = mesh_get_derived_render(ob, &needsFree);
 		dlm = dm->convertToDispListMesh(dm);
@@ -2734,7 +2734,7 @@ void RE_freeRotateBlenderScene(void)
 				MEM_freeN(me->orco);
 				me->orco= 0;
 			}
-			if (mesh_uses_displist(me) && ((me->subdiv!=me->subdivr) || (ob->effect.first != NULL) || ob==G.obedit) ) { 
+			if ((me->flag&ME_SUBSURF) && ((me->subdiv!=me->subdivr) || (ob->effect.first != NULL) || ob==G.obedit) ) { 
 			    /* Need to recalc for effects since they are time dependant */
 				makeDispList(ob);  /* XXX this should be replaced with proper caching */
 			}
@@ -2956,7 +2956,7 @@ void RE_rotateBlenderScene(void)
 				else if(ob->parent && ob->parent->type==OB_LATTICE) makeDispList(ob);
 				else if(ob->hooks.first) makeDispList(ob);
 				else if(ob->softflag & 0x01) makeDispList(ob);
-				else if(me->disp.first==NULL && mesh_uses_displist(me)) makeDispList(ob);
+				else if(me->disp.first==NULL && (me->flag&ME_SUBSURF)) makeDispList(ob);
 				else if(ob->effect.first) {	// as last check
 					Effect *eff= ob->effect.first;
 					if(eff->type==EFF_WAVE) makeDispList(ob);