Fix T66924 : Move GPencil Modifiers evaluation to Depsgraph

Before, the evaluation of modifers were done in draw manager. The reason of the old design was grease pencil was designed before depsgraph was in place.

This commit moves this logic to depsgraph to follow general design and reduce Draw Manager complexity. Also, this is required in order to use modifiers in Edit modes.

Really, there is nothing really new in the creation of derived data, only the logic has been moved to depsgraph, but the main logic is the same. In order to get a reference to the original stroke and points, a pointer is added to Runtime data as part of the evaluated data. These pointers allow to know and use the original data.

As the modifiers now are evaluated in Depsgraph, the evaluated stroke is usable in Edit modes, so now it's possible to work with the evaluated version instead to use a "ghost" of the final image over the original geometry as work today.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5470

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_gpencil_modifier.h b/source/blender/blenkernel/BKE_gpencil_modifier.h
index 7f55ee2beb4..c2a4462dcbd 100644
--- a/source/blender/blenkernel/BKE_gpencil_modifier.h
+++ b/source/blender/blenkernel/BKE_gpencil_modifier.h
@@ -27,7 +27,6 @@
 struct BMEditMesh;
 struct DepsNodeHandle;
 struct Depsgraph;
-struct DerivedMesh;
 struct GpencilModifierData;
 struct ID;
 struct ListBase;
@@ -328,4 +327,8 @@ int BKE_gpencil_time_modifier(struct Depsgraph *depsgraph,
 void BKE_gpencil_lattice_init(struct Object *ob);
 void BKE_gpencil_lattice_clear(struct Object *ob);
 
+void BKE_gpencil_modifiers_calc(struct Depsgraph *depsgraph,
+                                struct Scene *scene,
+                                struct Object *ob);
+
 #endif /* __BKE_GPENCIL_MODIFIER_H__ */