Fix #20965: metaballs partticles and volume material crash rendering

Fix #21187: 2.5svn26947 - particles + meta sphere = crash in rendering

Use separated displists for mballs in view3d and render stuff.
Do not recalculate displist for view3d while rendering - mball.c
uses several global variables which shouldn't be accepted from
parallel threads.

6 files changed, 23 insertions, 14 deletions

diff --git a/source/blender/blenkernel/BKE_displist.h b/source/blender/blenkernel/BKE_displist.h
index 9e75e55adf6..df0627f61ba 100644
--- a/source/blender/blenkernel/BKE_displist.h
+++ b/source/blender/blenkernel/BKE_displist.h
@@ -93,6 +93,7 @@ extern void makeDispListCurveTypes(struct Scene *scene, struct Object *ob, int f
 extern void makeDispListCurveTypes_forRender(struct Scene *scene, struct Object *ob, struct ListBase *dispbase, struct DerivedMesh **derivedFinal, int forOrco);
 extern void makeDispListCurveTypes_forOrco(struct Scene *scene, struct Object *ob, struct ListBase *dispbase);
 extern void makeDispListMBall(struct Scene *scene, struct Object *ob);
+extern void makeDispListMBall_forRender(struct Scene *scene, struct Object *ob, struct ListBase *dispbase);
 extern void shadeDispList(struct Scene *scene, struct Base *base);
 extern void shadeMeshMCol(struct Scene *scene, struct Object *ob, struct Mesh *me);
 
diff --git a/source/blender/blenkernel/BKE_lattice.h b/source/blender/blenkernel/BKE_lattice.h
index f35dff53cd5..880f3f7e724 100644
--- a/source/blender/blenkernel/BKE_lattice.h
+++ b/source/blender/blenkernel/BKE_lattice.h
@@ -49,7 +49,7 @@ void init_latt_deform(struct Object *oblatt, struct Object *ob);
 void calc_latt_deform(struct Object *, float *co, float weight);
 void end_latt_deform(struct Object *);
 
-int object_deform_mball(struct Object *ob);
+int object_deform_mball(struct Object *ob, struct ListBase *dispbase);
 void outside_lattice(struct Lattice *lt);
 
 void curve_deform_verts(struct Scene *scene, struct Object *cuOb, struct Object *target, 
diff --git a/source/blender/blenkernel/BKE_mball.h b/source/blender/blenkernel/BKE_mball.h
index 130969d4892..5d41f4e374e 100644
--- a/source/blender/blenkernel/BKE_mball.h
+++ b/source/blender/blenkernel/BKE_mball.h
@@ -164,12 +164,12 @@ struct MetaBall *add_mball(char *name);
 struct MetaBall *copy_mball(struct MetaBall *mb);
 void make_local_mball(struct MetaBall *mb);
 void tex_space_mball(struct Object *ob);
-float *make_orco_mball(struct Object *ob);
+float *make_orco_mball(struct Object *ob, struct ListBase *dispbase);
 void copy_mball_properties(struct Scene *scene, struct Object *active_object);
 struct Object *find_basis_mball(struct Scene *scene, struct Object *ob);
 int is_basis_mball(struct Object *ob);
 int is_mball_basis_for(struct Object *ob1, struct Object *ob2);
-void metaball_polygonize(struct Scene *scene, struct Object *ob);
+void metaball_polygonize(struct Scene *scene, struct Object *ob, struct ListBase *dispbase);
 void calc_mballco(struct MetaElem *ml, float *vec);
 float densfunc(struct MetaElem *ball, float x, float y, float z);
 float metaball(float x, float y, float z);
diff --git a/source/blender/blenkernel/intern/displist.c b/source/blender/blenkernel/intern/displist.c
index a958d8c353b..716d3110bc3 100644
--- a/source/blender/blenkernel/intern/displist.c
+++ b/source/blender/blenkernel/intern/displist.c
@@ -1172,20 +1172,30 @@ void makeDispListMBall(Scene *scene, Object *ob)
 {
 	if(!ob || ob->type!=OB_MBALL) return;
 
+	// XXX: mball stuff uses plenty of global variables
+	//      while this is unchanged updating during render is unsafe
+	if(G.rendering) return;
+
 	freedisplist(&(ob->disp));
-	
+
 	if(ob->type==OB_MBALL) {
 		if(ob==find_basis_mball(scene, ob)) {
-			metaball_polygonize(scene, ob);
+			metaball_polygonize(scene, ob, &ob->disp);
 			tex_space_mball(ob);
 
-			object_deform_mball(ob);
+			object_deform_mball(ob, &ob->disp);
 		}
 	}
 	
 	boundbox_displist(ob);
 }
 
+void makeDispListMBall_forRender(Scene *scene, Object *ob, ListBase *dispbase)
+{
+	metaball_polygonize(scene, ob, dispbase);
+	object_deform_mball(ob, dispbase);
+}
+
 static ModifierData *curve_get_tesselate_point(Scene *scene, Object *ob, int forRender, int editmode)
 {
 	ModifierData *md = modifiers_getVirtualModifierList(ob);
diff --git a/source/blender/blenkernel/intern/lattice.c b/source/blender/blenkernel/intern/lattice.c
index 1954bac7e93..5824afd9ded 100644
--- a/source/blender/blenkernel/intern/lattice.c
+++ b/source/blender/blenkernel/intern/lattice.c
@@ -869,12 +869,12 @@ void lattice_deform_verts(Object *laOb, Object *target, DerivedMesh *dm,
 	end_latt_deform(laOb);
 }
 
-int object_deform_mball(Object *ob)
+int object_deform_mball(Object *ob, ListBase *dispbase)
 {
 	if(ob->parent && ob->parent->type==OB_LATTICE && ob->partype==PARSKEL) {
 		DispList *dl;
 
-		for (dl=ob->disp.first; dl; dl=dl->next) {
+		for (dl=dispbase->first; dl; dl=dl->next) {
 			lattice_deform_verts(ob->parent, ob, NULL,
 								 (float(*)[3]) dl->verts, dl->nr, NULL);
 		}
diff --git a/source/blender/blenkernel/intern/mball.c b/source/blender/blenkernel/intern/mball.c
index a15dad16e41..da9740a1486 100644
--- a/source/blender/blenkernel/intern/mball.c
+++ b/source/blender/blenkernel/intern/mball.c
@@ -226,7 +226,7 @@ void tex_space_mball(Object *ob)
 	boundbox_set_from_min_max(bb, min, max);
 }
 
-float *make_orco_mball(Object *ob)
+float *make_orco_mball(Object *ob, ListBase *dispbase)
 {
 	BoundBox *bb;
 	DispList *dl;
@@ -243,7 +243,7 @@ float *make_orco_mball(Object *ob)
 	loc[2]= (bb->vec[0][2]+bb->vec[1][2])/2.0f;
 	size[2]= bb->vec[1][2]-loc[2];
 
-	dl= ob->disp.first;
+	dl= dispbase->first;
 	orcodata= MEM_mallocN(sizeof(float)*3*dl->nr, "MballOrco");
 
 	data= dl->verts;
@@ -2088,7 +2088,7 @@ void init_metaball_octal_tree(int depth)
 	subdivide_metaball_octal_node(node, size[0], size[1], size[2], metaball_tree->depth);
 }
 
-void metaball_polygonize(Scene *scene, Object *ob)
+void metaball_polygonize(Scene *scene, Object *ob, ListBase *dispbase)
 {
 	PROCESS mbproc;
 	MetaBall *mb;
@@ -2105,7 +2105,6 @@ void metaball_polygonize(Scene *scene, Object *ob)
 
 	object_scale_to_mat3(ob, smat);
 
-	freedisplist(&ob->disp);
 	curindex= totindex= 0;
 	indices= 0;
 	thresh= mb->thresh;
@@ -2174,9 +2173,8 @@ void metaball_polygonize(Scene *scene, Object *ob)
 	}
 
 	if(curindex) {
-	
 		dl= MEM_callocN(sizeof(DispList), "mbaldisp");
-		BLI_addtail(&ob->disp, dl);
+		BLI_addtail(dispbase, dl);
 		dl->type= DL_INDEX4;
 		dl->nr= mbproc.vertices.count;
 		dl->parts= curindex;