[Bf-blender-cvs] [f7c78b1c7c1] temp-T81218-bbone-segments-driver-crash: Fix T81218: Crash in pose mode using a driver on bendy bone Segment
Sybren A. Stüvel
noreply at git.blender.org
Tue Oct 6 16:51:03 CEST 2020
Commit: f7c78b1c7c1f6aceeb5e63e73e1ef9d841e9e2df
Author: Sybren A. Stüvel
Date: Tue Oct 6 13:51:30 2020 +0200
Branches: temp-T81218-bbone-segments-driver-crash
https://developer.blender.org/rBf7c78b1c7c1f6aceeb5e63e73e1ef9d841e9e2df
Fix T81218: Crash in pose mode using a driver on bendy bone Segment
The example file in T81218 has a driver that maps a bone's X-location to the number of BBone segments. This caused a dependency cycle, which resulted in bad thread serialisation, which caused the crash.
This patch breaks the dependency cycle `BONE_LOCAL` → `DRIVER(bones["Bone"].bbone_segments)` → `BONE_LOCAL`. The 'Driver Data' relation now points to `BONE_SEGMENTS` when the driven property starts with `bbone_`.
Differential Revision: https://developer.blender.org/D9122
===================================================================
M source/blender/depsgraph/intern/builder/deg_builder_relations.cc
===================================================================
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
index 26839c67324..c0630cd47c6 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
@@ -1489,6 +1489,9 @@ void DepsgraphRelationBuilder::build_driver_data(ID *id, FCurve *fcu)
return;
}
+ const char *prop_identifier = RNA_property_identifier(property_entry_key.prop);
+ const bool driver_targets_bbone = STRPREFIX(prop_identifier, "bbone_");
+
/* Find objects which use this, and make their eval callbacks depend on this. */
for (IDNode *to_node : graph_->id_nodes) {
if (GS(to_node->id_orig->name) != ID_OB) {
@@ -1506,7 +1509,9 @@ void DepsgraphRelationBuilder::build_driver_data(ID *id, FCurve *fcu)
continue;
}
- OperationKey bone_key(&object->id, NodeType::BONE, pchan->name, OperationCode::BONE_LOCAL);
+ OperationCode target_op = driver_targets_bbone ? OperationCode::BONE_SEGMENTS :
+ OperationCode::BONE_LOCAL;
+ OperationKey bone_key(&object->id, NodeType::BONE, pchan->name, target_op);
add_relation(driver_key, bone_key, "Arm Bone -> Driver -> Bone");
}
/* Make the driver depend on COW, similar to the generic case below. */
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