Curves: add initial sculpt mode

This adds a new sculpt mode to the experimental new curves object.
Currently, this mode can only be entered and exited, nothing else.
The main initial purpose of this node will be to use it for hair grooming.

The patch also adds the `editors/curves/` directory for the new curves
object, which will be necessary for many other things as well.

I added a completely new mode (`OB_MODE_SCULPT_CURVES`), because
`OB_MODE_SCULPT` seems to be rather specific to meshes, and reusing
it doesn't seem worth the trouble. The tools/brushes used in mesh vs.
curves sculpt mode are quite distinct as well.

I had to add DNA_userdef_enums.h to make the patch compile with C++
(forward declaration of enums isn't allowed). This follows the same
pattern that we use for other enums in dna.

Differential Revision: https://developer.blender.org/D14107

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/editors/space_api/spacetypes.c b/source/blender/editors/space_api/spacetypes.c
index d27782877ce..897091731a4 100644
--- a/source/blender/editors/space_api/spacetypes.c
+++ b/source/blender/editors/space_api/spacetypes.c
@@ -28,6 +28,7 @@
 #include "ED_asset.h"
 #include "ED_clip.h"
 #include "ED_curve.h"
+#include "ED_curves.h"
 #include "ED_fileselect.h"
 #include "ED_geometry.h"
 #include "ED_gizmo_library.h"
@@ -99,6 +100,7 @@ void ED_spacetypes_init(void)
   ED_operatortypes_paint();
   ED_operatortypes_physics();
   ED_operatortypes_curve();
+  ED_operatortypes_curves();
   ED_operatortypes_armature();
   ED_operatortypes_marker();
   ED_operatortypes_metaball();