Add Oculus SDK LibOVR library to external deps.

src/external/OculusSDK/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 2014-2016 Oculus VR, LLC All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.3 (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
+
+http://www.oculusvr.com/licenses/LICENSE-3.3 
+
+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);
+
+ScaleAndOffset2D    CreateNDCScaleAndOffsetFromFov ( FovPort fov );
+
+
+} //namespace OVR
+
+#endif // OVR_StereoProjection_h