OpenSubdiv: Add new OpenSubdiv related files

This includes C-API bindings in intern/opensubdiv and CMAke module
which finds the OpenSubdiv library. This filea are not in use so
far, making it a separate commit to make actual integration commit
more clear.

1 files changed, 120 insertions, 0 deletions

diff --git a/intern/opensubdiv/opensubdiv_converter_capi.h b/intern/opensubdiv/opensubdiv_converter_capi.h
new file mode 100644
index 00000000000..7c96d3d8b96
--- /dev/null
+++ b/intern/opensubdiv/opensubdiv_converter_capi.h
@@ -0,0 +1,120 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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) 2015 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Sergey Sharybin.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __OPENSUBDIV_CONVERTER_CAPI_H__
+#define __OPENSUBDIV_CONVERTER_CAPI_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct OpenSubdiv_TopologyRefinerDescr;
+typedef struct OpenSubdiv_TopologyRefinerDescr OpenSubdiv_TopologyRefinerDescr;
+
+typedef struct OpenSubdiv_Converter OpenSubdiv_Converter;
+
+typedef enum OpenSubdiv_SchemeType {
+	OSD_SCHEME_BILINEAR,
+	OSD_SCHEME_CATMARK,
+	OSD_SCHEME_LOOP,
+} OpenSubdiv_SchemeType;
+
+typedef struct OpenSubdiv_Converter {
+	/* TODO(sergey): Needs to be implemented. */
+	/* OpenSubdiv::Sdc::Options get_options() const; */
+
+	OpenSubdiv_SchemeType (*get_type)(const OpenSubdiv_Converter *converter);
+
+	int (*get_num_faces)(const OpenSubdiv_Converter *converter);
+	int (*get_num_edges)(const OpenSubdiv_Converter *converter);
+	int (*get_num_verts)(const OpenSubdiv_Converter *converter);
+
+	/* Face relationships. */
+	int (*get_num_face_verts)(const OpenSubdiv_Converter *converter,
+	                          int face);
+	void (*get_face_verts)(const OpenSubdiv_Converter *converter,
+	                       int face,
+	                       int *face_verts);
+	void (*get_face_edges)(const OpenSubdiv_Converter *converter,
+	                       int face,
+	                       int *face_edges);
+
+	/* Edge relationships. */
+	void (*get_edge_verts)(const OpenSubdiv_Converter *converter,
+	                       int edge,
+	                       int *edge_verts);
+	int (*get_num_edge_faces)(const OpenSubdiv_Converter *converter,
+	                          int edge);
+	void (*get_edge_faces)(const OpenSubdiv_Converter *converter,
+	                       int edge,
+	                       int *edge_faces);
+	float (*get_edge_sharpness)(const OpenSubdiv_Converter *converter,
+	                            int edge);
+
+	/* Vertex relationships. */
+	int (*get_num_vert_edges)(const OpenSubdiv_Converter *converter, int vert);
+	void (*get_vert_edges)(const OpenSubdiv_Converter *converter,
+	                       int vert,
+	                       int *vert_edges);
+	int (*get_num_vert_faces)(const OpenSubdiv_Converter *converter, int vert);
+	void (*get_vert_faces)(const OpenSubdiv_Converter *converter,
+	                       int vert,
+	                       int *vert_faces);
+
+	void (*free_user_data)(const OpenSubdiv_Converter *converter);
+	void *user_data;
+} OpenSubdiv_Converter;
+
+OpenSubdiv_TopologyRefinerDescr *openSubdiv_createTopologyRefinerDescr(
+        OpenSubdiv_Converter *converter);
+
+void openSubdiv_deleteTopologyRefinerDescr(
+        OpenSubdiv_TopologyRefinerDescr *topology_refiner);
+
+/* TODO(sergey): Those calls are not strictly related on conversion.
+ * needs some dedicated fiel perhaps.
+ */
+
+int openSubdiv_topologyRefinerGetSubdivLevel(
+        const OpenSubdiv_TopologyRefinerDescr *topology_refiner);
+
+int openSubdiv_topologyRefinerGetNumVerts(
+        const OpenSubdiv_TopologyRefinerDescr *topology_refiner);
+
+int openSubdiv_topologyRefinerGetNumEdges(
+        const OpenSubdiv_TopologyRefinerDescr *topology_refiner);
+
+int openSubdiv_topologyRefinerGetNumFaces(
+        const OpenSubdiv_TopologyRefinerDescr *topology_refiner);
+
+int openSubdiv_topologyRefnerCompareConverter(
+        const OpenSubdiv_TopologyRefinerDescr *topology_refiner,
+        OpenSubdiv_Converter *converter);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __OPENSUBDIV_CONVERTER_CAPI_H__ */