GL_NV_depth_range_unclamped
	GL_SAMPLE_COUNT_BITS_NV 0x8864
	GL_CURRENT_SAMPLE_COUNT_QUERY_NV 0x8865
	GL_QUERY_RESULT_NV 0x8866
	GL_QUERY_RESULT_AVAILABLE_NV 0x8867
	GL_SAMPLE_COUNT_NV 0x8914