Merge newboolean branch into master.

This is for design task T67744, Boolean Redesign.
It adds a choice of solver to the Boolean modifier and the
Intersect (Boolean) and Intersect (Knife) tools.
The 'Fast' choice is the current Bmesh boolean.
The new 'Exact' choice is a more advanced algorithm that supports
overlapping geometry and uses more robust calculations, but is
slower than the Fast choice.
The default with this commit is set to 'Exact'. We can decide before
the 2.91 release whether or not this is the right choice, but this
choice now will get us more testing and feedback on the new code.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_290.c b/source/blender/blenloader/intern/versioning_290.c
index 00214c16eb0..3c326565557 100644
--- a/source/blender/blenloader/intern/versioning_290.c
+++ b/source/blender/blenloader/intern/versioning_290.c
@@ -504,6 +504,18 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
         }
       }
     }
+
+    /* Initialize solver for Boolean. */
+    if (!DNA_struct_elem_find(fd->filesdna, "BooleanModifierData", "enum", "solver")) {
+      for (Object *object = bmain->objects.first; object != NULL; object = object->id.next) {
+        LISTBASE_FOREACH (ModifierData *, md, &object->modifiers) {
+          if (md->type == eModifierType_Boolean) {
+            BooleanModifierData *bmd = (BooleanModifierData *)md;
+            bmd->solver = eBooleanModifierSolver_Fast;
+          }
+        }
+      }
+    }
   }
 
   /**