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diff --git a/gfx/vr/osvr/Util/RadialDistortionParametersC.h b/gfx/vr/osvr/Util/RadialDistortionParametersC.h
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+++ b/gfx/vr/osvr/Util/RadialDistortionParametersC.h
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+/** @file
+    @brief Header
+
+    Must be c-safe!
+
+    @date 2015
+
+    @author
+    Sensics, Inc.
+    <http://sensics.com/osvr>
+*/
+
+/*
+// Copyright 2015 Sensics, Inc.
+//
+// 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 INCLUDED_RadialDistortionParametersC_h_GUID_925BCEB1_BACA_4DA7_5133_FFF560C72EBD
+#define INCLUDED_RadialDistortionParametersC_h_GUID_925BCEB1_BACA_4DA7_5133_FFF560C72EBD
+
+/* Internal Includes */
+#include <osvr/Util/APIBaseC.h>
+#include <osvr/Util/Vec2C.h>
+#include <osvr/Util/Vec3C.h>
+
+/* Library/third-party includes */
+/* none */
+
+/* Standard includes */
+/* none */
+
+OSVR_EXTERN_C_BEGIN
+
+/** @addtogroup UtilMath
+@{
+*/
+
+/** @brief Parameters for a per-color-component radial distortion shader
+*/
+typedef struct OSVR_RadialDistortionParameters {
+    /** @brief Vector of K1 coefficients for the R, G, B channels*/
+    OSVR_Vec3 k1;
+    /** @brief Center of projection for the radial distortion, relative to the
+        bounds of this surface.
+        */
+    OSVR_Vec2 centerOfProjection;
+} OSVR_RadialDistortionParameters;
+
+OSVR_EXTERN_C_END
+
+#endif