I have just begun trying to use GRX. I can compile everything OK using Djgpp. However I am having difficulty running the test programs demogrx and bccbgi on my Windows XP and W2000 machines.
Many DOS apps, especially ones using extenders and direct hardware access (GRX/DJGPP uses both) have problems under NT-bases Windows-es. Not much (if anything) can be done.
I have tied setting SET GRX20DRV = STDVGA
then running demogrx 640 480 4. This works fine on my XP machine. But not on my W2000 laptop.
XP is more DOS-compatible than NT4/Win2K, but the laptops are kind of specific... The best Win~1 solution is to use GRX with MinGW 2.x/3.x (msys is not required). It runs in a Windows window, and I plan to write a DirectDraw driver sometime this year.