From 296c03a389076cf491a94f4d01b629ae335d027a Mon Sep 17 00:00:00 2001
From: Sergey Sharybin <sergey.vfx@gmail.com>
Date: Wed, 18 Sep 2019 15:56:46 +0200
Subject: Subvid: Initial support of subdiv topology query

Just some higher level functions to access topology information.
---
 source/blender/blenkernel/BKE_subdiv_topology.h    | 31 ++++++++++++++++++++
 source/blender/blenkernel/CMakeLists.txt           |  2 ++
 source/blender/blenkernel/intern/subdiv_topology.c | 34 ++++++++++++++++++++++
 3 files changed, 67 insertions(+)
 create mode 100644 source/blender/blenkernel/BKE_subdiv_topology.h
 create mode 100644 source/blender/blenkernel/intern/subdiv_topology.c

diff --git a/source/blender/blenkernel/BKE_subdiv_topology.h b/source/blender/blenkernel/BKE_subdiv_topology.h
new file mode 100644
index 00000000000..dd057d88fb6
--- /dev/null
+++ b/source/blender/blenkernel/BKE_subdiv_topology.h
@@ -0,0 +1,31 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2019 by Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup bke
+ */
+
+#ifndef __BKE_SUBDIV_TOPOLOGY_H__
+#define __BKE_SUBDIV_TOPOLOGY_H__
+
+struct Subdiv;
+
+int BKE_subdiv_topology_num_fvar_layers_get(const struct Subdiv *subdiv);
+
+#endif /* __BKE_SUBDIV_TOPOLOGY_H__ */
diff --git a/source/blender/blenkernel/CMakeLists.txt b/source/blender/blenkernel/CMakeLists.txt
index 16074cd3e37..e6360e1b511 100644
--- a/source/blender/blenkernel/CMakeLists.txt
+++ b/source/blender/blenkernel/CMakeLists.txt
@@ -211,6 +211,7 @@ set(SRC
   intern/subdiv_foreach.c
   intern/subdiv_mesh.c
   intern/subdiv_stats.c
+  intern/subdiv_topology.c
   intern/subsurf_ccg.c
   intern/suggestions.c
   intern/text.c
@@ -342,6 +343,7 @@ set(SRC
   BKE_subdiv_eval.h
   BKE_subdiv_foreach.h
   BKE_subdiv_mesh.h
+  BKE_subdiv_topology.h
   BKE_subsurf.h
   BKE_suggestions.h
   BKE_text.h
diff --git a/source/blender/blenkernel/intern/subdiv_topology.c b/source/blender/blenkernel/intern/subdiv_topology.c
new file mode 100644
index 00000000000..455fa2cf28f
--- /dev/null
+++ b/source/blender/blenkernel/intern/subdiv_topology.c
@@ -0,0 +1,34 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2019 by Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup bke
+ */
+
+#include "BKE_subdiv_topology.h"
+
+#include "BKE_subdiv.h"
+
+#include "opensubdiv_topology_refiner_capi.h"
+
+int BKE_subdiv_topology_num_fvar_layers_get(const struct Subdiv *subdiv)
+{
+  OpenSubdiv_TopologyRefiner *topology_refiner = subdiv->topology_refiner;
+  return topology_refiner->getNumFVarChannels(topology_refiner);
+}
-- 
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