Depsgraph: Fix missing point cache reset when physics changes

Among all the lines moved around, the general idea is quite simple.
Actually, there are two ideas implemented there.

First one, is when object itself is tagged for update, we tag its
point cache component for evaluation, which makes it so point cache
is properly reset. We do it implicitly because otherwise we'll need
to go everywhere and add explicit tag in almost all the properties.

Second thing is, we link all collider and force fields to a point
cache component using special type of link. This type of link only
allows flush if change is caused by a user update. This way reset
does not happen when change is caused due to animation, but will
properly happen when user causes indirect change to the objects
which are part of physics simulation.

1 files changed, 13 insertions, 4 deletions

diff --git a/source/blender/depsgraph/DEG_depsgraph_build.h b/source/blender/depsgraph/DEG_depsgraph_build.h
index 1895b483644..93e9b5be2cc 100644
--- a/source/blender/depsgraph/DEG_depsgraph_build.h
+++ b/source/blender/depsgraph/DEG_depsgraph_build.h
@@ -131,15 +131,15 @@ typedef enum eDepsObjectComponentType {
 	DEG_OB_COMP_CACHE,
 } eDepsObjectComponentType;
 
-void DEG_add_scene_relation(struct DepsNodeHandle *node,
+void DEG_add_scene_relation(struct DepsNodeHandle *node_handle,
                             struct Scene *scene,
                             eDepsSceneComponentType component,
                             const char *description);
-void DEG_add_object_relation(struct DepsNodeHandle *node,
+void DEG_add_object_relation(struct DepsNodeHandle *node_handle,
                              struct Object *object,
                              eDepsObjectComponentType component,
                              const char *description);
-void DEG_add_object_relation_with_customdata(struct DepsNodeHandle *node,
+void DEG_add_object_relation_with_customdata(struct DepsNodeHandle *node_handle,
                                              struct Object *object,
                                              eDepsObjectComponentType component,
                                              uint64_t customdata_mask,
@@ -154,9 +154,18 @@ void DEG_add_object_cache_relation(struct DepsNodeHandle *handle,
                                    eDepsObjectComponentType component,
                                    const char *description);
 
+/* Adds relations from the given component of a given object to the given node
+ * handle AND the component to the point cache component of the node's ID.
+ */
+void DEG_add_object_pointcache_relation(struct DepsNodeHandle *node_handle,
+                                        struct Object *object,
+                                        eDepsObjectComponentType component,
+                                        const char *description);
+
 void DEG_add_special_eval_flag(struct DepsNodeHandle *handle, struct ID *id, uint32_t flag);
 
-struct Depsgraph *DEG_get_graph_from_handle(struct DepsNodeHandle *handle);
+struct ID *DEG_get_id_from_handle(struct DepsNodeHandle *node_handle);
+struct Depsgraph *DEG_get_graph_from_handle(struct DepsNodeHandle *node_handle);
 
 /* ************************************************ */