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diff --git a/intern/cycles/kernel/osl/shader.h b/intern/cycles/kernel/osl/shader.h
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+++ b/intern/cycles/kernel/osl/shader.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 __OSL_SHADER_H__
+#define __OSL_SHADER_H__
+
+#ifdef WITH_OSL
+
+/* OSL Shader Engine
+ *
+ * Holds all variables to execute and use OSL shaders from the kernel. These
+ * are initialized externally by OSLShaderManager before rendering starts.
+ *
+ * Before/after a thread starts rendering, thread_init/thread_free must be
+ * called, which will store any per thread OSL state in thread local storage.
+ * This means no thread state must be passed along in the kernel itself.
+ */
+
+#  include "kernel/types.h"
+
+CCL_NAMESPACE_BEGIN
+
+class Scene;
+
+struct ShaderClosure;
+struct ShaderData;
+struct IntegratorStateCPU;
+struct differential3;
+struct KernelGlobalsCPU;
+
+struct OSLGlobals;
+struct OSLShadingSystem;
+
+class OSLShader {
+ public:
+  /* init */
+  static void register_closures(OSLShadingSystem *ss);
+
+  /* per thread data */
+  static void thread_init(KernelGlobalsCPU *kg, OSLGlobals *osl_globals);
+  static void thread_free(KernelGlobalsCPU *kg);
+
+  /* eval */
+  static void eval_surface(const KernelGlobalsCPU *kg,
+                           const void *state,
+                           ShaderData *sd,
+                           uint32_t path_flag);
+  static void eval_background(const KernelGlobalsCPU *kg,
+                              const void *state,
+                              ShaderData *sd,
+                              uint32_t path_flag);
+  static void eval_volume(const KernelGlobalsCPU *kg,
+                          const void *state,
+                          ShaderData *sd,
+                          uint32_t path_flag);
+  static void eval_displacement(const KernelGlobalsCPU *kg, const void *state, ShaderData *sd);
+
+  /* attributes */
+  static int find_attribute(const KernelGlobalsCPU *kg,
+                            const ShaderData *sd,
+                            uint id,
+                            AttributeDescriptor *desc);
+};
+
+CCL_NAMESPACE_END
+
+#endif
+
+#endif /* __OSL_SHADER_H__ */