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diff --git a/source/nanovg/nanovg_gl.h b/source/nanovg/nanovg_gl.h
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+++ b/source/nanovg/nanovg_gl.h
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+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef NANOVG_GL_H_F380EF20_CDA3_11EA_AF55_D3B6DB88CFCC
+#define NANOVG_GL_H_F380EF20_CDA3_11EA_AF55_D3B6DB88CFCC
+
+#include "nanovg.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Create flags
+
+enum NVGcreateFlags {
+	// Flag indicating if geometry based anti-aliasing is used (may not be needed when using MSAA).
+	NVG_ANTIALIAS = 1<<0,
+	// Flag indicating if strokes should be drawn using stencil buffer. The rendering will be a little
+	// slower, but path overlaps (i.e. self-intersecting or sharp turns) will be drawn just once.
+	NVG_STENCIL_STROKES = 1<<1,
+	// Flag indicating that additional debug checks are done.
+	NVG_DEBUG = 1<<2,
+};
+
+// Define VTable with pointers to the functions for a each OpenGL (ES) version.
+
+typedef struct {
+	const char *name;
+	NVGcontext* (*createContext)(int flags);
+	void (*deleteContext) (NVGcontext* ctx);
+	int (*createImageFromHandle) (NVGcontext* ctx, unsigned int textureId, int w, int h, int flags);
+	unsigned int (*getImageHandle) (NVGcontext* ctx, int image);
+} NanoVG_GL_Functions_VTable;
+
+// Create NanoVG contexts for different OpenGL (ES) versions.
+
+NVGcontext* nvgCreateGL2(int flags);
+void nvgDeleteGL2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL2(NVGcontext* ctx, int image);
+
+NVGcontext* nvgCreateGL3(int flags);
+void nvgDeleteGL3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL3(NVGcontext* ctx, int image);
+
+NVGcontext* nvgCreateGLES2(int flags);
+void nvgDeleteGLES2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image);
+
+NVGcontext* nvgCreateGLES3(int flags);
+void nvgDeleteGLES3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image);
+
+// These are additional flags on top of NVGimageFlags.
+enum NVGimageFlagsGL {
+	NVG_IMAGE_NODELETE = 1<<16, // Do not delete GL texture handle.
+};
+
+// Create VTables for different OpenGL (ES) versions.
+
+extern const NanoVG_GL_Functions_VTable NanoVG_GL2_Functions_VTable;
+extern const NanoVG_GL_Functions_VTable NanoVG_GL3_Functions_VTable;
+extern const NanoVG_GL_Functions_VTable NanoVG_GLES2_Functions_VTable;
+extern const NanoVG_GL_Functions_VTable NanoVG_GLES3_Functions_VTable;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NANOVG_GL_H_F380EF20_CDA3_11EA_AF55_D3B6DB88CFCC