On Fri, 30 Jul 1999, Josu Onandia wrote:

Hi All,

I suscribed to this list a month ago, and I don't see a lot of mouvement on the list, so I wonder if GRX is actually being used. If so, perhaps someone can help me.

I'm evaluating the possibility of porting GRX to a PowerPC, precisely to a MPC823, which has its own on-chip graphics system. I don't need all the possibilities of GRX, with a 8 bits per pixel frame, and off-screen bitmaps of 1 bit per pixel will be enough.

Any help or suggestion would be very appreciate.

Well,

first tweak grx20.h and add

#define GRX_VERSION_GCC_MPC823 -1 // Replace GCC by your compilers name, if your stuff gets included // a unique positiv number will be assigned by the GRX maintainers

Now add #if defined(__GNUC__) && defined(???) // Add the right stuff here #define GRX_VERSION GRX_VERSION_GCC_MPC823 #endif

Check the definition of GrColor a few lines later

Now tweak src/include/libgrx.h for your system. If you checked all setting up to /* * global library data structures */ everything should be fine

Now try to set up a makefile and leave out the fdrivers, vdrivers, setup and mouse subdirs.

If the highlevel parts of GRX compile, try to compile the setup dir.

If youŽre still lucky, continue with the ram8.c driver from the fdrivers subdir and the vdrivers/vtable.c file.

If everything worked well, you now have a GRX that can do 256 Color graphics in memory. I donŽt think teherŽs currently a test that will check rhis setup. Would be nice if you could submit one ...

That was the easy part. YouŽll have to add support the the vdrivers subdir so GRX knows how to setup graphics on your system. When done, add a driver in fdrivers for readpixel and drawpixel. The rest of the functionality can be taken from src/fdrivers/generic at first

Try to compile the test subdir and check if things work well.

Continue by adding more functions to the frame driver, adding more color modes, mouse and keyboard-support, ...

Good luck, Hartmut

PS: At first, second and third view, you shouldnŽt try to figure out what all those macros inside of GRX do --- ItŽs a really big mess but very flexible for optimizing GRX. readpixel/drawpixel should work fine with the usual peek and poke macros from mempeek.h