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diff --git a/source/blender/blenkernel/BKE_volume_render.h b/source/blender/blenkernel/BKE_volume_render.h
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+++ b/source/blender/blenkernel/BKE_volume_render.h
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+/*
+ * ***** 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.
+ *
+ * Contributor(s): Brecht Van Lommel.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef __BKE_VOLUME_RENDER_H__
+#define __BKE_VOLUME_RENDER_H__
+
+/** \file BKE_volume_render.h
+ *  \ingroup bke
+ *  \brief Volume datablock rendering and viewport drawing utilities.
+ */
+
+#include "BLI_sys_types.h"
+
+#include "DNA_volume_types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Volume;
+struct VolumeGrid;
+
+/* Dense Voxels */
+
+bool BKE_volume_grid_dense_bounds(const struct Volume *volume,
+                                  struct VolumeGrid *volume_grid,
+                                  int64_t min[3],
+                                  int64_t max[3]);
+void BKE_volume_grid_dense_transform_matrix(const struct VolumeGrid *volume_grid,
+                                            const int64_t min[3],
+                                            const int64_t max[3],
+                                            float matrix[4][4]);
+void BKE_volume_grid_dense_voxels(const struct Volume *volume,
+                                  struct VolumeGrid *volume_grid,
+                                  const int64_t min[3],
+                                  const int64_t max[3],
+                                  float *voxels);
+
+/* Wireframe */
+
+typedef void (*BKE_volume_wireframe_cb)(
+    void *userdata, float (*verts)[3], int (*edges)[2], int totvert, int totedge);
+
+void BKE_volume_grid_wireframe(const struct Volume *volume,
+                               struct VolumeGrid *volume_grid,
+                               BKE_volume_wireframe_cb cb,
+                               void *cb_userdata);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif