3D Texturing: Undo.

Blender can only support a single undo system per undo step. As sculpting/vertex colors are mutual exclusive operations
out approach is just to switch the undo system when painting on an image.

PBVHNodes contain a list of areas that needs to be pushed to the undo system.

Currently the undo code is in sculpt_paint_image. We should eventually support undo for color filtering and other nodes.
we might need to place it to its own compile unit so more brushes can invoke the same code.

{F13048942}

Reviewed By: brecht

Maniphest Tasks: T97479

Differential Revision: https://developer.blender.org/D14821

1 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/pbvh_pixels.cc b/source/blender/blenkernel/intern/pbvh_pixels.cc
index 40742ad36d5..49397797c0d 100644
--- a/source/blender/blenkernel/intern/pbvh_pixels.cc
+++ b/source/blender/blenkernel/intern/pbvh_pixels.cc
@@ -308,6 +308,12 @@ static void update_pixels(PBVH *pbvh, Mesh *mesh, Image *image, ImageUser *image
     apply_watertight_check(pbvh, image, image_user);
   }
 
+  /* Rebuild the undo regions. */
+  for (PBVHNode *node : nodes_to_update) {
+    NodeData *node_data = static_cast<NodeData *>(node->pixels.node_data);
+    node_data->rebuild_undo_regions();
+  }
+
   /* Clear the UpdatePixels flag. */
   for (PBVHNode *node : nodes_to_update) {
     node->flag = static_cast<PBVHNodeFlags>(node->flag & ~PBVH_RebuildPixels);