The rest of the "driver" is some even lower level code that pushed the bytes straigt to the LCD. I ripped it of from some KS0108 code I found somewhere on the internet. You would need to rip it off from some driver that works for your display. The code is not intended as some kind of "official" driver for anything. I just exhibits the fact that if you just copy a "framebuffer" directly to the hardware it will be extraordinary fast.
I could try to dig out the rest again but chances are that it won't work with your display. The reason is that this KS0108 code was not very good and that by now I changed this for a ST7565 display and corresponding code. (BTW: the ST7565 is much faster although it gets the data serial instead of parallel).
Since you already have a GLCD library that works with your display the easisest way would be to rip of this library for the direct hardware control.
Udo