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diff --git a/intern/cycles/subd/dice.h b/intern/cycles/subd/dice.h
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+/*
+ * Copyright 2011-2013 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __SUBD_DICE_H__
+#define __SUBD_DICE_H__
+
+/* DX11 like EdgeDice implementation, with different tessellation factors for
+ * each edge for watertight tessellation, with subpatch remapping to work with
+ * DiagSplit. For more algorithm details, see the DiagSplit paper or the
+ * ARB_tessellation_shader OpenGL extension, Section 2.X.2. */
+
+#include "util/types.h"
+#include "util/vector.h"
+
+#include "subd/subpatch.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Camera;
+class Mesh;
+class Patch;
+
+struct SubdParams {
+  Mesh *mesh;
+  bool ptex;
+
+  int test_steps;
+  int split_threshold;
+  float dicing_rate;
+  int max_level;
+  Camera *camera;
+  Transform objecttoworld;
+
+  SubdParams(Mesh *mesh_, bool ptex_ = false)
+  {
+    mesh = mesh_;
+    ptex = ptex_;
+
+    test_steps = 3;
+    split_threshold = 1;
+    dicing_rate = 1.0f;
+    max_level = 12;
+    camera = NULL;
+  }
+};
+
+/* EdgeDice Base */
+
+class EdgeDice {
+ public:
+  SubdParams params;
+  float3 *mesh_P;
+  float3 *mesh_N;
+  size_t vert_offset;
+  size_t tri_offset;
+
+  explicit EdgeDice(const SubdParams &params);
+
+  void reserve(int num_verts, int num_triangles);
+
+  void set_vert(Patch *patch, int index, float2 uv);
+  void add_triangle(Patch *patch, int v0, int v1, int v2);
+
+  void stitch_triangles(Subpatch &sub, int edge);
+};
+
+/* Quad EdgeDice */
+
+class QuadDice : public EdgeDice {
+ public:
+  explicit QuadDice(const SubdParams &params);
+
+  float3 eval_projected(Subpatch &sub, float u, float v);
+
+  float2 map_uv(Subpatch &sub, float u, float v);
+  void set_vert(Subpatch &sub, int index, float u, float v);
+
+  void add_grid(Subpatch &sub, int Mu, int Mv, int offset);
+
+  void set_side(Subpatch &sub, int edge);
+
+  float quad_area(const float3 &a, const float3 &b, const float3 &c, const float3 &d);
+  float scale_factor(Subpatch &sub, int Mu, int Mv);
+
+  void dice(Subpatch &sub);
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __SUBD_DICE_H__ */