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diff --git a/intern/cycles/bvh/bvh_params.h b/intern/cycles/bvh/bvh_params.h
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+++ b/intern/cycles/bvh/bvh_params.h
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+/*
+ * Adapted from code copyright 2009-2010 NVIDIA Corporation
+ * Modifications Copyright 2011, 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 __BVH_PARAMS_H__
+#define __BVH_PARAMS_H__
+
+CCL_NAMESPACE_BEGIN
+
+/* BVH Parameters */
+
+class BVHParams
+{
+public:
+	/* spatial split area threshold */
+	bool use_spatial_split;
+	float spatial_split_alpha;
+
+	/* SAH costs */
+	float sah_node_cost;
+	float sah_triangle_cost;
+
+	/* number of triangles in leaf */
+	int min_leaf_size;
+	int max_leaf_size;
+
+	/* object or mesh level bvh */
+	bool top_level;
+
+	/* disk cache */
+	bool use_cache;
+
+	/* QBVH */
+	bool use_qbvh;
+
+	/* fixed parameters */
+	enum {
+		MAX_DEPTH = 64,
+		MAX_SPATIAL_DEPTH = 48,
+		NUM_SPATIAL_BINS = 32
+	};
+
+	BVHParams()
+	{
+		use_spatial_split = true;
+		spatial_split_alpha = 1e-5f;
+
+		sah_node_cost = 1.0f;
+		sah_triangle_cost = 1.0f;
+
+		min_leaf_size = 1;
+		max_leaf_size = 0x7FFFFFF;
+
+		top_level = false;
+		use_cache = false;
+		use_qbvh = false;
+	}
+
+	/* SAH costs */
+	float cost(int num_nodes, int num_tris) const
+	{ return node_cost(num_nodes) + triangle_cost(num_tris); }
+
+	float triangle_cost(int n) const
+	{ return n*sah_triangle_cost; }
+
+	float node_cost(int n) const
+	{ return n*sah_node_cost; }
+};
+
+CCL_NAMESPACE_END
+
+#endif /* __BVH_PARAMS_H__ */
+