Cleanup: Remove unecessary C API for direct mesh boolean

The main goal here is to remove the need for a C API to the code in
`mesh_boolean_convert.cc`. This is achieved by moving `MOD_boolean.c`
to C++ and making the necessary changes for it to compile. On top of
that there are some other slight simplifications possible to the
direct mesh boolean code: it doesn't need to copy the material
remaps, and the modifier code can use some other C++ types directly.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/bmesh/tools/bmesh_intersect.h b/source/blender/bmesh/tools/bmesh_intersect.h
index adb88f2fd76..d09ea67a3bb 100644
--- a/source/blender/bmesh/tools/bmesh_intersect.h
+++ b/source/blender/bmesh/tools/bmesh_intersect.h
@@ -20,6 +20,10 @@
  * \ingroup bmesh
  */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 bool BM_mesh_intersect(BMesh *bm,
                        struct BMLoop *(*looptris)[3],
                        const int looptris_tot,
@@ -41,3 +45,7 @@ enum {
   BMESH_ISECT_BOOLEAN_UNION = 1,
   BMESH_ISECT_BOOLEAN_DIFFERENCE = 2,
 };
+
+#ifdef __cplusplus
+}
+#endif