Depsgraph: add a new operation node for computing B-Bone segments.

Computing the shape of a B-Bone is a quite expensive operation, and
there are multiple constraints that can access this information in
a variety of useful ways. This means computing the shape once per
bone and saving it is good for performance.

Since the shape may depend on the position of up to two other bones,
often in a "cyclic" manner, this computation has to be a separate
node with its own dependencies.

Reviewers: sergey

Differential Revision: https://developer.blender.org/D3975

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_armature.h b/source/blender/blenkernel/BKE_armature.h
index be8bd9557e5..1831e93cccb 100644
--- a/source/blender/blenkernel/BKE_armature.h
+++ b/source/blender/blenkernel/BKE_armature.h
@@ -170,6 +170,9 @@ void b_bone_spline_setup(struct bPoseChannel *pchan, const bool rest, Mat4 resul
 
 int BKE_compute_b_bone_spline(struct BBoneSplineParameters *param, Mat4 result_array[MAX_BBONE_SUBDIV]);
 
+void BKE_pchan_cache_bbone_segments(struct bPoseChannel *pchan);
+void BKE_pchan_copy_bbone_segments_cache(struct bPoseChannel *pchan, struct bPoseChannel *pchan_from);
+
 /* like EBONE_VISIBLE */
 #define PBONE_VISIBLE(arm, bone) ( \
 	CHECK_TYPE_INLINE(arm, bArmature *), \
@@ -241,6 +244,11 @@ void BKE_pose_bone_done(
         struct Object *ob,
         int pchan_index);
 
+void BKE_pose_eval_bbone_segments(
+        struct Depsgraph *depsgraph,
+        struct Object *ob,
+        int pchan_index);
+
 void BKE_pose_iktree_evaluate(
         struct Depsgraph *depsgraph,
         struct Scene *scene,