I made some modifications to the driver file "HDM64GS12.C" (it's working on my K0107 based GLCD only I have to invert CS1 & CS2)
I added a 3rd 'color' to the pixel functions, XORing the new pixel with the old pixel (this is for sprites)
Now the colors are ON/OFF/XOR (or SET/CLEAR/XOR!) for the color parameter.
I only used pixel & line functions & they both working - other functions should work too I guess.
"graphics.c" needs to be modefied too - the color parameter needs to be of tye int not int1 (although I've tested the routines without this modifing graphics.c and to my surprise - it works!!!)
The driver can be enhanced more though! - maybe later when the time don't fly!!!!