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diff --git a/LibOVR/Src/OVR_CAPI_GL.h b/LibOVR/Src/OVR_CAPI_GL.h
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+/************************************************************************************
+
+Filename    :   OVR_CAPI_GL.h
+Content     :   GL specific structures used by the CAPI interface.
+Created     :   November 7, 2013
+Authors     :   Lee Cooper
+
+Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
+
+Use of this software is subject to the terms of the Oculus Inc license
+agreement provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+************************************************************************************/
+#ifndef OVR_CAPI_GL_h
+#define OVR_CAPI_GL_h
+
+#include "OVR_CAPI.h"
+
+//-----------------------------------------------------------------------------------
+// ***** GL Specific
+
+#if defined(OVR_OS_WIN32)
+    #include <Windows.h>
+    #include <GL/gl.h>
+    #include <GL/glext.h>
+    #include <GL/wglext.h>
+#elif defined(OVR_OS_MAC)
+    #include <OpenGL/gl3.h>
+    #include <OpenGL/gl3ext.h>
+    #include <OpenGL/OpenGL.h>
+#else
+    #include <GL/gl.h>
+    #include <GL/glext.h>
+    #include <GL/glx.h>
+#endif
+
+
+// Used to configure slave GL rendering (i.e. for devices created externally).
+typedef struct ovrGLConfigData_s
+{
+    // General device settings.
+    ovrRenderAPIConfigHeader Header;
+
+#if defined(OVR_OS_WIN32)
+    HWND   Window;
+#elif defined(OVR_OS_LINUX)
+    Display* Disp;
+    Window  Win;
+#endif
+} ovrGLConfigData;
+
+union ovrGLConfig
+{
+    ovrRenderAPIConfig Config;
+    ovrGLConfigData OGL;
+};
+
+// Used to pass GL eye texture data to ovrHmd_EndFrame.
+typedef struct ovrGLTextureData_s
+{
+    // General device settings.
+    ovrTextureHeader          Header;
+    GLuint           TexId;       
+} ovrGLTextureData;
+
+typedef union ovrGLTexture_s
+{
+    ovrTexture          Texture;
+    ovrGLTextureData	OGL;
+} ovrGLTexture;
+
+#endif	// OVR_CAPI_GL_h