Fix T52134: New depsgraph crashes when evaluating several psys on from object

source/blender/blenkernel/BKE_particle.h

@@ -473,9 +473,8 @@ typedef struct ParticleRenderData {
 
 struct EvaluationContext;
 
-void BKE_particle_system_eval(struct EvaluationContext *eval_ctx,
-                              struct Scene *scene,
-                              struct Object *ob,
-                              struct ParticleSystem *psys);
+void BKE_particle_system_eval_init(struct EvaluationContext *eval_ctx,
+                                   struct Scene *scene,
+                                   struct Object *ob);
 
 #endif

source/blender/blenkernel/intern/particle_system.c

@@ -4350,13 +4350,12 @@ void BKE_particlesystem_id_loop(ParticleSystem *psys, ParticleSystemIDFunc func,
 
 /* **** Depsgraph evaluation **** */
 
-void BKE_particle_system_eval(EvaluationContext *UNUSED(eval_ctx),
-                              Scene *scene,
-                              Object *ob,
-                              ParticleSystem *psys)
+void BKE_particle_system_eval_init(EvaluationContext *UNUSED(eval_ctx),
+                                   Scene *scene,
+                                   Object *ob)
 {
 	if (G.debug & G_DEBUG_DEPSGRAPH) {
-		printf("%s on %s:%s\n", __func__, ob->id.name, psys->name);
+		printf("%s on %s\n", __func__, ob->id.name);
 	}
 	BKE_ptcache_object_reset(scene, ob, PTCACHE_RESET_DEPSGRAPH);
 }

source/blender/depsgraph/intern/builder/deg_builder_nodes.cc

@@ -671,6 +671,13 @@ void DepsgraphNodeBuilder::build_particles(Scene *scene, Object *ob)
 	ComponentDepsNode *psys_comp =
 	        add_component_node(&ob->id, DEG_NODE_TYPE_EVAL_PARTICLES);
 
+	add_operation_node(psys_comp,
+	                   function_bind(BKE_particle_system_eval_init,
+	                                 _1,
+	                                 scene,
+	                                 ob),
+	                   DEG_OPCODE_PSYS_EVAL_INIT);
+
 	/* particle systems */
 	LINKLIST_FOREACH (ParticleSystem *, psys, &ob->particlesystem) {
 		ParticleSettings *part = psys->part;
@@ -682,11 +689,7 @@ void DepsgraphNodeBuilder::build_particles(Scene *scene, Object *ob)
 		/* this particle system */
 		// TODO: for now, this will just be a placeholder "ubereval" node
 		add_operation_node(psys_comp,
-		                   function_bind(BKE_particle_system_eval,
-		                                 _1,
-		                                 scene,
-		                                 ob,
-		                                 psys),
+		                   NULL,
 		                   DEG_OPCODE_PSYS_EVAL,
 		                   psys->name);
 	}

source/blender/depsgraph/intern/builder/deg_builder_relations.cc

@@ -1239,6 +1239,13 @@ void DepsgraphRelationBuilder::build_particles(Scene *scene, Object *ob)
 	OperationKey obdata_ubereval_key(&ob->id,
 	                                 DEG_NODE_TYPE_GEOMETRY,
 	                                 DEG_OPCODE_GEOMETRY_UBEREVAL);
+	OperationKey eval_init_key(&ob->id,
+	                           DEG_NODE_TYPE_EVAL_PARTICLES,
+	                           DEG_OPCODE_PSYS_EVAL_INIT);
+	/* TODO(sergey): Are all particle systems depends on time?
+	 * Hair without dynamics i.e.
+	 */
+	add_relation(time_src_key, eval_init_key, "TimeSrc -> PSys");
 
 	/* particle systems */
 	LINKLIST_FOREACH (ParticleSystem *, psys, &ob->particlesystem) {
@@ -1254,10 +1261,7 @@ void DepsgraphRelationBuilder::build_particles(Scene *scene, Object *ob)
 		if (!psys_check_enabled(ob, psys, G.is_rendering))
 			continue;
 
-		/* TODO(sergey): Are all particle systems depends on time?
-		 * Hair without dynamics i.e.
-		 */
-		add_relation(time_src_key, psys_key, "TimeSrc -> PSys");
+		add_relation(eval_init_key, psys_key, "Init -> PSys");
 
 		/* TODO(sergey): Currently particle update is just a placeholder,
 		 * hook it to the ubereval node so particle system is getting updated

source/blender/depsgraph/intern/depsgraph_type_defines.cc

@@ -119,6 +119,7 @@ static const char *stringify_opcode(eDepsOperation_Code opcode)
 		STRINGIFY_OPCODE(BONE_READY);
 		STRINGIFY_OPCODE(BONE_DONE);
 		STRINGIFY_OPCODE(PSYS_EVAL);
+		STRINGIFY_OPCODE(PSYS_EVAL_INIT);
 
 		case DEG_NUM_OPCODES: return "SpecialCase";
 #undef STRINGIFY_OPCODE

source/blender/depsgraph/intern/depsgraph_types.h

@@ -219,6 +219,7 @@ typedef enum eDepsOperation_Code {
 	/* Particles --------------------------------------- */
 
 	/* XXX: placeholder - Particle System eval */
+	DEG_OPCODE_PSYS_EVAL_INIT,
 	DEG_OPCODE_PSYS_EVAL,
 
 	DEG_NUM_OPCODES,