1GL_VERSION_4_2 2https://www.opengl.org/registry/doc/glspec42.compatibility.20120427.pdf 3 4 5 GL_COPY_READ_BUFFER_BINDING 0x8F36 6 GL_COPY_WRITE_BUFFER_BINDING 0x8F37 7 GL_TRANSFORM_FEEDBACK_ACTIVE 0x8E24 8 GL_TRANSFORM_FEEDBACK_PAUSED 0x8E23 9 GL_COMPRESSED_RGBA_BPTC_UNORM 0x8E8C 10 GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM 0x8E8D 11 GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT 0x8E8E 12 GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT 0x8E8F 13 14