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diff --git a/LibOVR/Include/OVR_CAPI_GL.h b/LibOVR/Include/OVR_CAPI_GL.h
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+++ b/LibOVR/Include/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, LLC. 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
+
+/// @file OVR_CAPI_GL.h
+/// OpenGL rendering support.
+
+#include "OVR_CAPI.h"
+
+#if defined(OVR_OS_WIN32)
+    #include <Windows.h>
+    #include <gl/GL.h>
+#elif defined(__APPLE__)
+    #include <OpenGL/gl.h>
+#else
+    #include <GL/gl.h>
+#endif
+
+
+#if defined(_MSC_VER)
+    #pragma warning(push)
+    #pragma warning(disable: 4324) // structure was padded due to __declspec(align())
+#endif
+
+
+/// Used to configure slave GL rendering (i.e. for devices created externally).
+typedef struct ovrGLConfigData_s
+{
+    ovrRenderAPIConfigHeader Header;    ///< General device settings.
+
+#if defined(OVR_OS_WIN32)
+    HWND Window;                ///< The optional window handle. If unset, rendering will use the current window.
+    HDC  DC;                    ///< The optional device context. If unset, rendering will use a new context.
+#elif defined (OVR_OS_LINUX)
+    struct _XDisplay* Disp;     ///< Optional display. If unset, will issue glXGetCurrentDisplay when context is current.
+#endif
+} ovrGLConfigData;
+
+#if defined(__cplusplus)
+    static_assert(sizeof(ovrRenderAPIConfig) >= sizeof(ovrGLConfigData), "Insufficient size.");
+#endif
+
+/// Contains OpenGL-specific rendering information.
+union ovrGLConfig
+{
+    ovrRenderAPIConfig Config;  ///< General device settings.
+    ovrGLConfigData    OGL;     ///< OpenGL-specific settings.
+};
+
+/// Used to pass GL eye texture data to ovrHmd_EndFrame.
+typedef struct ovrGLTextureData_s
+{
+    ovrTextureHeader Header;    ///< General device settings.
+    GLuint           TexId;     ///< The OpenGL name for this texture.
+} ovrGLTextureData;
+
+#if defined(__cplusplus)
+    static_assert(sizeof(ovrTexture) >= sizeof(ovrGLTextureData), "Insufficient size.");
+#endif
+
+/// Contains OpenGL-specific texture information.
+typedef union ovrGLTexture_s
+{
+    ovrTexture       Texture;   ///< General device settings.
+    ovrGLTextureData OGL;       ///< OpenGL-specific settings.
+} ovrGLTexture;
+
+
+#if defined(_MSC_VER)
+    #pragma warning(pop)
+#endif
+
+
+#endif    // OVR_CAPI_GL_h