GL_EXT_semaphore
http://www.opengl.org/registry/specs/EXT/external_objects.txt
GL_EXT_semaphore

	void glDeleteSemaphoresEXT (GLsizei n, const GLuint* semaphores)
	void glGenSemaphoresEXT (GLsizei n, GLuint* semaphores)
	void glGetSemaphoreParameterui64vEXT (GLuint semaphore, GLenum pname, GLuint64* params)
	GLboolean glIsSemaphoreEXT (GLuint semaphore)
	void glSemaphoreParameterui64vEXT (GLuint semaphore, GLenum pname, const GLuint64* params)
	void glSignalSemaphoreEXT (GLuint semaphore, GLuint numBufferBarriers, const GLuint* buffers, GLuint numTextureBarriers, const GLuint *textures, const GLenum *dstLayouts)
	void glWaitSemaphoreEXT (GLuint semaphore, GLuint numBufferBarriers, const GLuint* buffers, GLuint numTextureBarriers, const GLuint *textures, const GLenum *srcLayouts)