Xref: news2.mv.net comp.os.msdos.djgpp:6194
From: flyboy AT ari DOT net (Nathaniel Meo)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Graphics w/o GRX
Date: Sat, 20 Jul 1996 03:12:16 GMT
Organization: ARInternet, Corp.
Lines: 43
Message-ID: <4spisa$hu2@ari.ari.net>
References: <4sou0p$4va AT news DOT stealth DOT net>
NNTP-Posting-Host: flyboy.ari.net
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

mohan AT stealth DOT net (Mohan Khurana) wrote:

>Now... I want to try to do some graphics without using GRX, JLIB, BGI,
>and all those other libraries because I'd like to have some experience
>in figuring out how to work with both ASM and C.  I also think that it
>would be better for me to do graphics the hard way because it might
>help me if I ever switch to a UNIX platform, like SGI or SUN.

>Now, so far, I have been able to set the graphics mode to 13h by doing
>the following code: 

>asm ("
>	movw $0x0013, %ax
>	int $0x10
>");

>Okay. that successfully gets me into mode 13h.  When my program exits,
>the DOS prompt is now very large and very bad looking.  The quality of
>the text looks rather like CGA graphics, very bad.

>Question 1:     Is there any way to get a better graphics mode?  I am
>looking for maybe a list of the different modes and their
>correstponding resolutions.

>Okay... now I have gotten into getting the graphics mode up, I want to
>start to get into doing some real graphics. 

>Question 2:      Is there any way to change the background to a color?
>I am looking for a way that maybe communicates with the computer
>directly, I would preffer not to use conio.h or dos.h.

>Question 3:      Is there any way to make a colored line?

>Again, I would preffer not to use the PC specific header files, not
>because I hate DOS, just because I'd like to learn more ASM, and get
>into more computer graphics.

First thing, get a copy of Ralf Brown Interrupt list for info on
interrupts and their options. This includes a list of all the video
modes for the PC. Also check out
http://remus.rutgers.edu/~avly/djgpp.html for info on assembly and
graphics programming in DJGPP.