GOOENGINE: Add autoclose stroke option for gpencil strokes

Update for GPv3

scripts/startup/bl_ui/space_view3d.py

@@ -230,7 +230,7 @@ class VIEW3D_HT_tool_header(Header):
             layout.prop(tool_settings, "use_gpencil_automerge_strokes", text="")
             layout.prop(tool_settings, "use_gpencil_weight_data_add", text="", icon='WPAINT_HLT')
             layout.prop(tool_settings, "use_gpencil_draw_onback", text="", icon='MOD_OPACITY')
-
+            layout.prop(tool_settings, "use_gpencil_autoclose_strokes", text="")
 
 class _draw_tool_settings_context_mode:
     @staticmethod

source/blender/editors/sculpt_paint/grease_pencil_paint.cc

@@ -1488,6 +1488,13 @@ void PaintOperation::on_stroke_done(const bContext &C)
                                                            bke::AttrDomain::Point);
   screen_space_positions.span.slice(points).copy_from(this->screen_space_final_coords_);
   screen_space_positions.finish();
+  
+    if ((scene->toolsettings->gpencil_flags & GP_TOOL_FLAG_AUTOCLOSE_STROKE) != 0) {
+      bke::SpanAttributeWriter<bool> cyclic = attributes.lookup_or_add_for_write_span<bool>(
+          "cyclic", bke::AttrDomain::Curve);
+      cyclic.span[active_curve] = true;
+      cyclic.finish();
+    }
 
   /* Remove trailing points with radii close to zero. */
   trim_end_points(drawing, 1e-5f, on_back, active_curve);
@@ -1496,6 +1503,7 @@ void PaintOperation::on_stroke_done(const bContext &C)
   deselect_stroke(C, drawing, active_curve);
 
   if (do_post_processing) {
+
     if (settings->draw_smoothfac > 0.0f) {
       smooth_stroke(drawing, settings->draw_smoothfac, settings->draw_smoothlvl, active_curve);
     }

source/blender/makesdna/DNA_scene_types.h

@@ -2775,6 +2775,8 @@ typedef enum eGPencil_Flags {
   GP_TOOL_FLAG_CREATE_WEIGHTS = (1 << 4),
   /** Auto-merge with last stroke. */
   GP_TOOL_FLAG_AUTOMERGE_STROKE = (1 << 5),
+  /* Autoclose last stroke */
+  GP_TOOL_FLAG_AUTOCLOSE_STROKE = (1 << 6),
 } eGPencil_Flags;
 
 /** #Scene::r.simplify_gpencil */

source/blender/makesrna/intern/rna_scene.cc

@@ -3807,6 +3807,17 @@ static void rna_def_tool_settings(BlenderRNA *brna)
   RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
   RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, nullptr);
 
+  prop = RNA_def_property(srna, "use_gpencil_autoclose_strokes", PROP_BOOLEAN, PROP_NONE);
+  RNA_def_property_boolean_sdna(prop, NULL, "gpencil_flags", GP_TOOL_FLAG_AUTOCLOSE_STROKE);
+  RNA_def_property_boolean_default(prop, false);
+  RNA_def_property_ui_icon(prop, ICON_AUTOMERGE_OFF, 1);
+  RNA_def_property_ui_text(
+      prop,
+      "Autoclose",
+      "Close the last drawn stroke before post processing");
+  RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
+  RNA_def_property_update(prop, NC_SCENE | ND_TOOLSETTINGS, NULL);
+
   prop = RNA_def_property(srna, "gpencil_sculpt", PROP_POINTER, PROP_NONE);
   RNA_def_property_pointer_sdna(prop, nullptr, "gp_sculpt");
   RNA_def_property_flag(prop, PROP_DEG_SYNC_ONLY);