Comment 13 for bug 1037610

you can use 3d support without using a 3d compositor for the desktop, this is the setup I use.
I use fluxbox with two monitors, the Nvidia 660 and no 3d composition. My applications still have full 3d acceleration.
The performance is actually better with a light weight like fluxbox and better without the overhead of 3d desktop features
while allowing applications the same 3d capabilities they would have using gnome/unity/etc.
So without using compiz you will still have the same opengl functionality as with compiz.
I am not sure about EGL I will see what I can find specifically for that option.

There are some commands you can use to verify 3d acceleration is enabled etc.
glxgears
glxinfo
glxinfo | grep render
nvidia-settings

/usr/lib/nux/unity_support_test -p //this fails on my system because I do not have 3d composition enabled, but does not effect the 3d capabilities for applications, only for the desktop appearance/effects

So I can completely verify that you have 3d for applications without a compositor if you are concerned about that.