Depsgraph: Fix missing material update when changing links in node tree

source/blender/depsgraph/DEG_depsgraph.h

@@ -157,6 +157,11 @@ enum {
 
 	/* Update copy on write component without flushing down the road. */
 	DEG_TAG_COPY_ON_WRITE = (1 << 8),
+
+	/* Tag shading components for update.
+	 * Only parameters of material changed).
+	 */
+	DEG_TAG_SHADING_UPDATE  = (1 << 9),
 };
 void DEG_id_tag_update(struct ID *id, int flag);
 void DEG_id_tag_update_ex(struct Main *bmain,

source/blender/depsgraph/intern/depsgraph_tag.cc

@@ -234,6 +234,21 @@ void id_tag_update_particle(Depsgraph *graph, IDDepsNode *id_node, int tag)
 	particle_comp->tag_update(graph);
 }
 
+void id_tag_update_shading(Depsgraph *graph, IDDepsNode *id_node, int tag)
+{
+	ComponentDepsNode *shading_comp =
+	        id_node->find_component(DEG_NODE_TYPE_SHADING);
+	if (shading_comp == NULL) {
+#ifdef STRICT_COMPONENT_TAGGING
+		DEG_ERROR_PRINTF("ERROR: Unable to find shading component for %s\n",
+		                 id_node->id_orig->name);
+		BLI_assert(!"This is not supposed to happen!");
+#endif
+		return;
+	}
+	shading_comp->tag_update(graph);
+}
+
 #ifdef WITH_COPY_ON_WRITE
 /* Tag corresponding to DEG_TAG_COPY_ON_WRITE. */
 void id_tag_update_copy_on_write(Depsgraph *graph, IDDepsNode *id_node)
@@ -272,6 +287,9 @@ void deg_graph_id_tag_update(Main *bmain, Depsgraph *graph, ID *id, int flag)
 	if (flag & PSYS_RECALC) {
 		id_tag_update_particle(graph, id_node, flag);
 	}
+	if (flag & DEG_TAG_SHADING_UPDATE) {
+		id_tag_update_shading(graph, id_node, flag);
+	}
 #ifdef WITH_COPY_ON_WRITE
 	if (flag & DEG_TAG_COPY_ON_WRITE) {
 		id_tag_update_copy_on_write(graph, id_node);

source/blender/editors/render/render_update.c

@@ -298,6 +298,13 @@ static void material_changed(Main *bmain, Material *ma)
 	/* icons */
 	BKE_icon_changed(BKE_icon_id_ensure(&ma->id));
 
+	/* glsl */
+	if (ma->id.tag & LIB_TAG_ID_RECALC) {
+		if (!BLI_listbase_is_empty(&ma->gpumaterial)) {
+			GPU_material_free(&ma->gpumaterial);
+		}
+	}
+
 	/* find node materials using this */
 	for (parent = bmain->mat.first; parent; parent = parent->id.next) {
 		if (parent->use_nodes && parent->nodetree && nodes_use_material(parent->nodetree, ma)) {
@@ -474,6 +481,16 @@ static void world_changed(Main *UNUSED(bmain), World *wo)
 
 	/* XXX temporary flag waiting for depsgraph proper tagging */
 	wo->update_flag = 1;
+
+	/* glsl */
+	if (wo->id.tag & LIB_TAG_ID_RECALC) {
+		if (!BLI_listbase_is_empty(&defmaterial.gpumaterial)) {
+			GPU_material_free(&defmaterial.gpumaterial);
+		}
+		if (!BLI_listbase_is_empty(&wo->gpumaterial)) {
+			GPU_material_free(&wo->gpumaterial);
+		}
+	}
 }
 
 static void image_changed(Main *bmain, Image *ima)

source/blender/makesrna/intern/rna_nodetree.c

@@ -2284,11 +2284,11 @@ static void rna_NodeSocket_value_update(Main *bmain, Scene *scene, PointerRNA *p
 		FOREACH_NODETREE(bmain, tntree, id) {
 			switch (GS(id->name)) {
 				case ID_WO:
-					DEG_id_tag_update_ex(bmain, id, 0);
+					DEG_id_tag_update_ex(bmain, id, DEG_TAG_SHADING_UPDATE);
 					WM_main_add_notifier(NC_MATERIAL | ND_SHADING, NULL);
 					break;
 				case ID_MA:
-					DEG_id_tag_update_ex(bmain, id, 0);
+					DEG_id_tag_update_ex(bmain, id, DEG_TAG_SHADING_UPDATE);
 					WM_main_add_notifier(NC_MATERIAL | ND_SHADING, id);
 					break;
 			}