Weight Paint: Implement a new Lock-Relative mode.

This check box alters how weights are displayed and painted,
similar to Multi Paint, but in a different way. Specifically,
weights are presented as if all locked vertex groups were
deleted, and the remaining deform groups normalized.

The new feature is intended for use when balancing weights within
a group of bones while all others are locked. Enabling the option
presents weight as if the locked bones didn't exist, and their
weight was proportionally redistributed to the editable bones.

Conversely, the Multi-Paint feature allows balancing a group of
bones as a whole against all unselected bones, while ignoring
weight distribution within the selected group.

This mode also allows temporarily viewing non-normalized weights
as if they were normalized, without actually changing the values.

Differential Revision: https://developer.blender.org/D3837

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/draw/intern/draw_cache_extract.h b/source/blender/draw/intern/draw_cache_extract.h
index 6226b5dcf7f..0e02b07e95b 100644
--- a/source/blender/draw/intern/draw_cache_extract.h
+++ b/source/blender/draw/intern/draw_cache_extract.h
@@ -34,12 +34,17 @@ typedef struct DRW_MeshWeightState {
   /* Set of all selected bones for Multipaint. */
   bool *defgroup_sel; /* [defgroup_len] */
   int defgroup_sel_count;
+
+  /* Set of all locked and unlocked deform bones for Lock Relative mode. */
+  bool *defgroup_locked;   /* [defgroup_len] */
+  bool *defgroup_unlocked; /* [defgroup_len] */
 } DRW_MeshWeightState;
 
 /* DRW_MeshWeightState.flags */
 enum {
   DRW_MESH_WEIGHT_STATE_MULTIPAINT = (1 << 0),
   DRW_MESH_WEIGHT_STATE_AUTO_NORMALIZE = (1 << 1),
+  DRW_MESH_WEIGHT_STATE_LOCK_RELATIVE = (1 << 2),
 };
 
 typedef struct DRW_MeshCDMask {