That means the server supports it. You also need the driver to support it and the two to agree on how they support it. Basically, GLX_EXT_texture_from_pixmap should show up 3 times in glxinfo.
That means the server supports it. You also need the driver to support it and the two to agree on how they support it. Basically, GLX_EXT_ texture_ from_pixmap should show up 3 times in glxinfo.