Re: GAS colorr pixel problem
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Jean-Yves Lamoureux wrote:
A D wrote:Jean-Yves Lamoureux wrote:gas is just an assembler. You can do whatever you want with an assembler, as every single executed bit on your processor is the output of an assembler (ok purists, I just simplified). "Filling a rectangle" means nothing. You have to draw something that will be interpreted as a bunch of pixels having the sahpe of a rectangle. You can do that in ascii (libcaca for example, http://libcaca.zoy.org ), or in graphic mode (SVGAlib, old as hell but works on most PC cards, without X), X11 (which itself has dozen of low (xlib) and high (sdl, ptc, gtk, qt, whatever) level libraries to do that).I suggest you to learn how to call C-like functions (pushing arguments, calling function), how to work with memory (lea, syscalls, brk, etc), then to use something like SDL for example, which does most of the work for you.Thanks to all for your input. I guess it would be really difficult to color pixels in assembly language. Can anyone tell me what steps are involved in that(color pixels in assembly)? Just for my knowledge. Thanks.http://www.google.com/codesearch?q=show:GtRjeWKEOlc:2P9VXd642nk:3e2ZV6Tu0vo&sa=N&ct=rd&cs_p=http://allergy.alrj.org/Code/xtest.tgz&cs_f=xtest/PTC4k.asmMay seem hard to understand, it is a "complete" graphical library in asm, using xlib. That's not the easiest way, but hey, you wanna learn !(Wrote by me yeaaaars ago, when I was a young padawan, rewritten from scratch by a friend later)
Very nice! I hadn't seen that one. Thanks!!!Other possible ways to plot a pixel... If you enable the "frame buffer device" at bootup ("vga=769" or somesuch), you can open "/dev/fb0" and write to it (need root access). This is fairly easy, but requires that the user enable the device.
Richard Cooper/PJ (you still around?) wrote a thing called "softer", which acquires access to the ports, and does vga (yuck) graphics by diddling the ports. I find this quite impressive, but it isn't a "Beginner Project"!!! *Using* softer from your own code - as it's intended - is fairly easy. (so easy that Richard provide examples in Perl!!!)
Even crazier, I'm in the midst of an experiment to use the X windows system without using Xlib - int 80h only. It's in a very early stage, but "seems to work".
This is assembly language! We can do anything that *can* be done, and usually several different ways. The "right" way to do it - "The Unix Way" - is to use the library(s). But there are options, if you want to see "what we can get away with".
Any examples I could provide would be in Nasm syntax. Mostly easy enough to "translate" to Gas. More Nasm examples (glut, SDL, etc.) can be found in the "files" section of the !Yahoo! group http://groups.yahoo.com/group/linux-nasm-users
I don't suppose I could interest you in any hot stock tips? :) Best, Frank - To unsubscribe from this list: send the line "unsubscribe linux-assembly" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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