1GLX_EXT_stereo_tree 2https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf 3GLX_EXT_stereo_tree 4 5 GLX_STEREO_NOTIFY_EXT 0x00000000 6 GLX_STEREO_NOTIFY_MASK_EXT 0x00000001 7 GLX_STEREO_TREE_EXT 0x20F5 8