GL_ARB_occlusion_query
http://oss.sgi.com/projects/ogl-sample/registry/ARB/occlusion_query.txt
	GL_QUERY_COUNTER_BITS_ARB 0x8864
	GL_CURRENT_QUERY_ARB 0x8865
	GL_QUERY_RESULT_ARB 0x8866
	GL_QUERY_RESULT_AVAILABLE_ARB 0x8867
	GL_SAMPLES_PASSED_ARB 0x8914
	void glBeginQueryARB (GLenum target, GLuint id)
	void glDeleteQueriesARB (GLsizei n, const GLuint* ids)
	void glEndQueryARB (GLenum target)
	void glGenQueriesARB (GLsizei n, GLuint* ids)
	void glGetQueryObjectivARB (GLuint id, GLenum pname, GLint* params)
	void glGetQueryObjectuivARB (GLuint id, GLenum pname, GLuint* params)
	void glGetQueryivARB (GLenum target, GLenum pname, GLint* params)
	GLboolean glIsQueryARB (GLuint id)