Re: Graphics in ADA

[tmoran@bix.com (Tom Moran)]

>Does anyone know how to implement VGA graphics in ADA?
In 16 bit DOS, 32 bit DOS, Windows xxx? Try
http://stad.dsl.nl/~jvandyk
>access the graphics memory of the computer. But, alas, I also cannot find
>any information on how to access memory locations in ADA.
You need an address representation clause, eg,
  CRT : array(0 .. 479, 0 .. 639) of Pixels;
  for CRT'address use (segment=>16#A000#, offset=>0);
(This address clause is from memory for 16 bit DOS, Other OSes have
different memory structures, of course.)  There's also the little
matter of doing IO operations to the graphics card, which will involve
calling something like Output(Port=>16#3F8#, Value=>16#81#), depending
on what your compiler vendor has supplied in the library, or doing
calls to the BIOS, again dependent on your vendor supplied library.
If you actually need 16 bit DOS routines, and have access to
Compuserve (now part of AOL), look in the VESA section - there's a
(very old) Ada 83 driver and example programs.  If you are running on
Windows, the whole style of graphics is different.