From:	AndrewJ <luminous-is AT REMOVE DOT home DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Newbie GFX
Message-ID:	<k8sfps0vt8jtk1memg5s2rl56ehkf410fe@4ax.com>
References:	<01c004b9$f4bc0ec0$ac7297d4 AT grebo>
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Date:	Mon, 14 Aug 2000 13:20:17 GMT
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>Im trying to learn gfx programming in c++ but with no actual result...
>I know streams arrays and all of the basic programming but when i see a gfx
>tutorial i see all these strange words and calls ive never seen before.
>theres several links to gfx tutorial but setting mode 13 doesnt work.
>i take the example code and try to compile it with gpp but the compiler
>complains about _ax* and such not being initiated. im no expert but i
>believe thats a call to a lib i dont have or something like that. please
>help me...

Answers have already been given, so I'm going to give you some advice instead.

Rather than diving right into such a complicated matter as graphics
programming, I suggest you instead learn about the x86 architecture (its
instruction set, registers, etc), and then move on to DOS/BIOS interrupts.  If
you don't know what _ax is (its the Accumulator Register), you probably
shouldn't be trying to program graphics yet.

Also keep in mind that unless a tutorial specifically states it's written for
DJGPP (or that it uses no hardware/platform/compiler dependent code), it's
probably written for a Borland or Microsoft compiler, making it (generally)
incompatible with DJGPP.  Reading about real mode and protected mode probably
wouldn't hurt. ;)

-------
AndrewJ

"This is a wonderful answer.  It's off-topic, it's incorrect, and it doesn't
answer the question." - Richard Heathfield.

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