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diff --git a/src/core/GpuShaderUtils.h b/src/core/GpuShaderUtils.h
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+/*
+Copyright (c) 2003-2010 Sony Pictures Imageworks Inc., et al.
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in the
+  documentation and/or other materials provided with the distribution.
+* Neither the name of Sony Pictures Imageworks nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef INCLUDED_OCIO_GPUSHADERUTILS_H
+#define INCLUDED_OCIO_GPUSHADERUTILS_H
+
+#include <OpenColorIO/OpenColorIO.h>
+
+#include <sstream>
+
+OCIO_NAMESPACE_ENTER
+{
+    std::string GpuTextHalf4x4(const float * m44, GpuLanguage lang);
+    std::string GpuTextHalf4(const float * v4, GpuLanguage lang);
+    std::string GpuTextHalf3(const float * v3, GpuLanguage lang);
+    
+    void Write_mtx_x_vec(std::ostream & os,
+                         const std::string & mtx, const std::string & vec,
+                         GpuLanguage lang);
+    
+    void Write_half4x4(std::ostream & os, const float * m44, GpuLanguage lang);
+    void Write_half4(std::ostream & os, const float * v4,  GpuLanguage lang);
+    void Write_half3(std::ostream & os, const float * v3,  GpuLanguage lang);
+    
+    // returns vec3
+    void Write_sampleLut3D_rgb(std::ostream & os, const std::string & variableName,
+                               const std::string & lutName, int lut3DEdgeLen,
+                               GpuLanguage lang);
+}
+OCIO_NAMESPACE_EXIT
+
+#endif