for the openGl to work should the direct rendering be enabled

hi
i am using linux. the command glxinfo | grep direct gives

[babu@localhost ~]$ glxinfo | grep direct
direct rendering: No
OpenGL renderer string: Mesa GLX Indirect

should the direct rendering be compulsarily enabled for openGl to work.

No, OpenGL can work with indirect rendering as well. You won't have hardware acceleration, but the software implementation should work fine, although many extensions provided by graphics cards' vendors might not be available.