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diff --git a/ovr_sdk_win_23.0.0/LibOVR/Include/Extras/OVR_StereoProjection.h b/ovr_sdk_win_23.0.0/LibOVR/Include/Extras/OVR_StereoProjection.h
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+/************************************************************************************
+
+Filename    :   OVR_StereoProjection.h
+Content     :   Stereo projection functions
+Created     :   November 30, 2013
+Authors     :   Tom Fosyth
+
+Copyright   :   Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.
+
+Licensed under the Oculus Master SDK License Version 1.0 (the "License");
+you may not use the Oculus VR Rift SDK except in compliance with the License,
+which is provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+https://developer.oculus.com/licenses/oculusmastersdk-1.0
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK
+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 OVR_StereoProjection_h
+#define OVR_StereoProjection_h
+
+#include "Extras/OVR_Math.h"
+
+namespace OVR {
+
+//-----------------------------------------------------------------------------------
+// ***** Stereo Enumerations
+
+// StereoEye specifies which eye we are rendering for; it is used to
+// retrieve StereoEyeParams.
+enum StereoEye { StereoEye_Left, StereoEye_Right, StereoEye_Center };
+
+//-----------------------------------------------------------------------------------
+// ***** Propjection functions
+
+Matrix4f CreateProjection(
+    bool rightHanded,
+    bool isOpenGL,
+    FovPort fov,
+    StereoEye eye,
+    float zNear = 0.01f,
+    float zFar = 10000.0f,
+    bool flipZ = false,
+    bool farAtInfinity = false);
+
+Matrix4f CreateOrthoSubProjection(
+    bool rightHanded,
+    StereoEye eyeType,
+    float tanHalfFovX,
+    float tanHalfFovY,
+    float unitsX,
+    float unitsY,
+    float distanceFromCamera,
+    float interpupillaryDistance,
+    Matrix4f const& projection,
+    float zNear = 0.0f,
+    float zFar = 0.0f,
+    bool flipZ = false,
+    bool farAtInfinity = false);
+
+} // namespace OVR
+
+#endif // OVR_StereoProjection_h