1 files changed, 93 insertions, 0 deletions
diff --git a/source/blender/blenkernel/BKE_mesh_legacy_convert.h b/source/blender/blenkernel/BKE_mesh_legacy_convert.h
new file mode 100644
index 00000000000..11ee86c62a7
--- /dev/null
+++ b/source/blender/blenkernel/BKE_mesh_legacy_convert.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later
+ * Copyright 2001-2002 NaN Holding BV. All rights reserved. */
+
+#pragma once
+
+/** \file
+ * \ingroup bke
+ */
+
+#include "BLI_utildefines.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct CustomData;
+struct Mesh;
+struct MFace;
+
+/**
+ * Convert the hidden element attributes to the old flag format for writing.
+ */
+void BKE_mesh_legacy_convert_hide_layers_to_flags(struct Mesh *mesh);
+/**
+ * Convert the old hide flags (#ME_HIDE) to the hidden element attribute for reading.
+ * Only add the attributes when there are any elements in each domain hidden.
+ */
+void BKE_mesh_legacy_convert_flags_to_hide_layers(struct Mesh *mesh);
+
+/**
+ * Move material indices from a generic attribute to #MPoly.
+ */
+void BKE_mesh_legacy_convert_material_indices_to_mpoly(struct Mesh *mesh);
+/**
+ * Move material indices from the #MPoly struct to a generic attributes.
+ * Only add the attribute when the indices are not all zero.
+ */
+void BKE_mesh_legacy_convert_mpoly_to_material_indices(struct Mesh *mesh);
+
+/**
+ * Recreate #MFace Tessellation.
+ *
+ * \note This doesn't use multi-threading like #BKE_mesh_recalc_looptri since
+ * it's not used in many places and #MFace should be phased out.
+ */
+
+void BKE_mesh_tessface_calc(struct Mesh *mesh);
+
+void BKE_mesh_tessface_ensure(struct Mesh *mesh);
+
+void BKE_mesh_add_mface_layers(struct CustomData *fdata, struct CustomData *ldata, int total);
+
+/**
+ * Rotates the vertices of a face in case v[2] or v[3] (vertex index) is = 0.
+ * this is necessary to make the if #MFace.v4 check for quads work.
+ */
+int BKE_mesh_mface_index_validate(struct MFace *mface,
+                                  struct CustomData *mfdata,
+                                  int mfindex,
+                                  int nr);
+
+void BKE_mesh_convert_mfaces_to_mpolys(struct Mesh *mesh);
+
+/**
+ * The same as #BKE_mesh_convert_mfaces_to_mpolys
+ * but oriented to be used in #do_versions from `readfile.c`
+ * the difference is how active/render/clone/stencil indices are handled here.
+ *
+ * normally they're being set from `pdata` which totally makes sense for meshes which are already
+ * converted to #BMesh structures, but when loading older files indices shall be updated in other
+ * way around, so newly added `pdata` and `ldata` would have this indices set
+ * based on `fdata`  layer.
+ *
+ * this is normally only needed when reading older files,
+ * in all other cases #BKE_mesh_convert_mfaces_to_mpolys shall be always used.
+ */
+void BKE_mesh_do_versions_convert_mfaces_to_mpolys(struct Mesh *mesh);
+
+/* Inlines */
+
+/* NOTE(@sybren): Instead of -1 that function uses ORIGINDEX_NONE as defined in BKE_customdata.h,
+ * but I don't want to force every user of BKE_mesh.h to also include that file. */
+BLI_INLINE int BKE_mesh_origindex_mface_mpoly(const int *index_mf_to_mpoly,
+                                              const int *index_mp_to_orig,
+                                              const int i)
+{
+  const int j = index_mf_to_mpoly[i];
+  return (j != -1) ? (index_mp_to_orig ? index_mp_to_orig[j] : j) : -1;
+}
+
+#ifdef __cplusplus
+}
+#endif