How to set Depth Buffer ?

To All:
How to set Depth Buffer Bit without changing VGA’s Color Bits? Thanks

call glColorMask(0,0,0,0);

well, I haven’t tried that before and now I found out that my OpenGL card does not support it (->switches to software mode).

Another idea is glDrawBuffer(GL_NONE);

hope it helps

You can also try glDrawPixels with GL_DEPTH_COMPONENT.