GPencil: Refactor of Draw Engine, Vertex Paint and all internal functions

This commit is a full refactor of the grease pencil modules including Draw Engine, Modifiers, VFX, depsgraph update, improvements in operators and conversion of Sculpt and Weight paint tools to real brushes.

Also, a huge code cleanup has been done at all levels.

Thanks to @fclem for his work and yo @pepeland and @mendio for the testing and help in the development.

Differential Revision: https://developer.blender.org/D6293

3 files changed, 14 insertions, 1 deletions

diff --git a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
index 687ee492c3b..01d84f6b5d8 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_nodes.cc
@@ -1310,7 +1310,7 @@ void DepsgraphNodeBuilder::build_object_data_geometry_datablock(ID *obdata, bool
           obdata,
           NodeType::GEOMETRY,
           OperationCode::GEOMETRY_EVAL,
-          function_bind(BKE_gpencil_eval_geometry, _1, (bGPdata *)obdata_cow));
+          function_bind(BKE_gpencil_frame_active_set, _1, (bGPdata *)obdata_cow));
       op_node->set_as_entry();
       break;
     }
diff --git a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
index 78e05a69819..6791125d1e9 100644
--- a/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
+++ b/source/blender/depsgraph/intern/builder/deg_builder_relations.cc
@@ -2123,6 +2123,15 @@ void DepsgraphRelationBuilder::build_object_data_geometry_datablock(ID *obdata)
           add_relation(material_key, geometry_key, "Material -> GP Data");
         }
       }
+
+      /* Layer parenting need react to the parent object transformation. */
+      LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
+        if (gpl->parent != NULL) {
+          ComponentKey transform_key(&gpl->parent->id, NodeType::TRANSFORM);
+          ComponentKey gpd_geom_key(&gpd->id, NodeType::GEOMETRY);
+          add_relation(transform_key, gpd_geom_key, "GPencil Parent Layer");
+        }
+      }
       break;
     }
     default:
diff --git a/source/blender/depsgraph/intern/eval/deg_eval_copy_on_write.cc b/source/blender/depsgraph/intern/eval/deg_eval_copy_on_write.cc
index 95521ee9e47..1841f5f024f 100644
--- a/source/blender/depsgraph/intern/eval/deg_eval_copy_on_write.cc
+++ b/source/blender/depsgraph/intern/eval/deg_eval_copy_on_write.cc
@@ -43,6 +43,7 @@
 #include "BKE_curve.h"
 #include "BKE_global.h"
 #include "BKE_idprop.h"
+#include "BKE_gpencil.h"
 #include "BKE_layer.h"
 #include "BKE_lib_id.h"
 #include "BKE_scene.h"
@@ -791,6 +792,9 @@ void update_id_after_copy(const Depsgraph *depsgraph,
         }
         BKE_pose_pchan_index_rebuild(object_cow->pose);
       }
+      if (object_cow->type == OB_GPENCIL) {
+        BKE_gpencil_update_orig_pointers(object_orig, object_cow);
+      }
       update_particles_after_copy(depsgraph, object_orig, object_cow);
       update_modifiers_orig_pointers(object_orig, object_cow);
       update_proxy_pointers_after_copy(depsgraph, object_orig, object_cow);