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diff --git a/intern/opensubdiv/opensubdiv_gl_mesh_capi.h b/intern/opensubdiv/opensubdiv_gl_mesh_capi.h
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+// Copyright 2013 Blender Foundation. All rights reserved.
+//
+// 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.
+//
+// Author: Sergey Sharybin
+
+#ifndef OPENSUBDIV_CAPI_GL_MESH_CAPI_H_
+#define OPENSUBDIV_CAPI_GL_MESH_CAPI_H_
+
+#include <stdint.h>  // for bool
+
+#include "opensubdiv_capi_type.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct OpenSubdiv_GLMeshInternal;
+
+// Mesh which is displayable in OpenGL context.
+typedef struct OpenSubdiv_GLMesh {
+  //////////////////////////////////////////////////////////////////////////////
+  // Subdivision/topology part.
+
+  // Returns the GL index buffer containing the patch control vertices.
+  unsigned int (*getPatchIndexBuffer)(struct OpenSubdiv_GLMesh* gl_mesh);
+
+  // Bind GL buffer which contains vertices (VBO).
+  // TODO(sergey): Is this a coarse vertices?
+  void (*bindVertexBuffer)(struct OpenSubdiv_GLMesh* gl_mesh);
+
+  // Set coarse positions from a continuous array of coordinates.
+  void (*setCoarsePositions)(struct OpenSubdiv_GLMesh* gl_mesh,
+                             const float* positions,
+                             const int start_vertex,
+                             const int num_vertices);
+  // TODO(sergey): setCoarsePositionsFromBuffer().
+
+  // Refine after coarse positions update.
+  void (*refine)(struct OpenSubdiv_GLMesh* gl_mesh);
+
+  // Synchronize after coarse positions update and refine.
+  void (*synchronize)(struct OpenSubdiv_GLMesh* gl_mesh);
+
+  //////////////////////////////////////////////////////////////////////////////
+  // Drawing part.
+
+  // Prepare mesh for display.
+  void (*prepareDraw)(struct OpenSubdiv_GLMesh* gl_mesh,
+                      const bool use_osd_glsl,
+                      const int active_uv_index);
+
+  // Draw given range of patches.
+  //
+  // If fill_quads is false, then patches are drawn in wireframe.
+  void (*drawPatches)(struct OpenSubdiv_GLMesh *gl_mesh,
+                      const bool fill_quads,
+                      const int start_patch, const int num_patches);
+
+  // Internal storage for the use in this module only.
+  //
+  // Tease: This contains an actual OpenSubdiv's Mesh object.
+  struct OpenSubdiv_GLMeshInternal* internal;
+} OpenSubdiv_GLMesh;
+
+OpenSubdiv_GLMesh* openSubdiv_createOsdGLMeshFromTopologyRefiner(
+    struct OpenSubdiv_TopologyRefiner* topology_refiner,
+    eOpenSubdivEvaluator evaluator_type);
+
+void openSubdiv_deleteOsdGLMesh(OpenSubdiv_GLMesh *gl_mesh);
+
+// Global resources needed for GL mesh drawing.
+bool openSubdiv_initGLMeshDrawingResources(void);
+void openSubdiv_deinitGLMeshDrawingResources(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // OPENSUBDIV_CAPI_GL_MESH_CAPI_H_