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diff --git a/intern/dualcon/dualcon.h b/intern/dualcon/dualcon.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): Nicholas Bishop
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef DUALCON_H
+#define DUALCON_H
+
+#ifdef __cplusplus
+extern "C" { 
+#endif
+
+typedef float (*DualConCo)[3];
+typedef unsigned int (*DualConFaces)[4];
+struct DerivedMesh;
+
+typedef struct DualConInput {
+	DualConCo co;
+	int co_stride;
+	int totco;
+	
+	DualConFaces faces;
+	int face_stride;
+	int totface;
+	
+	float min[3], max[3];
+} DualConInput;
+
+/* callback for allocating memory for output */
+typedef void *(*DualConAllocOutput)(int totvert, int totquad);
+/* callback for adding a new vertex to the output */
+typedef void (*DualConAddVert)(void *output, const float co[3]);
+/* callback for adding a new quad to the output */
+typedef void (*DualConAddQuad)(void *output, const int vert_indices[4]);
+
+typedef enum {
+	DUALCON_FLOOD_FILL = 1,
+} DualConFlags;
+
+typedef enum {
+	/* blocky */
+	DUALCON_CENTROID,
+	/* smooth */
+	DUALCON_MASS_POINT,
+	/* keeps sharp edges */
+	DUALCON_SHARP_FEATURES,
+} DualConMode;
+
+/* Usage:
+   
+   The three callback arguments are used for creating the output
+   mesh. The alloc_output callback takes the total number of vertices
+   and faces (quads) that will be in the output. It should allocate
+   and return a structure to hold the output mesh. The add_vert and
+   add_quad callbacks will then be called for each new vertex and
+   quad, and the callback should add the new mesh elements to the
+   structure.
+*/
+void *dualcon(const DualConInput *input_mesh,
+			  /* callbacks for output */
+			  DualConAllocOutput alloc_output,
+			  DualConAddVert add_vert,
+			  DualConAddQuad add_quad,
+
+			  /* flags and settings to control the remeshing
+				 algorithm */
+			  DualConFlags flags,
+			  DualConMode mode,
+			  float threshold,
+			  float hermite_num,
+			  float scale,
+			  int depth);
+
+#ifdef __cplusplus
+} 
+#endif
+
+#endif