SVGALib
| Original author(s) | Harm Hanemaayer |
|---|---|
| Stable release | 1.4.3 / June 2, 2001 |
| Preview release | 1.9.25 |
| Written in | C |
| Operating system | Linux, FreeBSD |
| Platform | x86, x86-64 |
| Type | Library |
| Website |
www |
SVGAlib is an open-source low-level graphics library which runs on Linux and FreeBSD and allows programs to change video mode and display full-screen graphics. Some popular games like Quake and Doom have been ported to use SVGAlib.
History
The library was popular in mid-1990s. Toward 2000, many applications that used it migrated to X11 and SDL, which itself can make use of SVGAlib as a video driver.
A sample of SVGAlib code is shown below.
#include <stdlib.h>
#include <unistd.h>
#include <vga.h>
int main(void)
{
int color = 4;
int x = 10;
int y = 10;
unsigned int seconds = 5;
/* detect the chipset and give up supervisor rights */
if (vga_init() < 0)
return EXIT_FAILURE;
vga_setmode(G320x200x256);
vga_setcolor(color);
vga_drawpixel(x, y);
sleep(seconds);
/* restore textmode and fall back to ordinary text console handling */
vga_setmode(TEXT);
return EXIT_SUCCESS;
}
Example of use on linux mint 17.3 mate 32-bit dvd-live :
open software manager and install : libsvga1 libsvga1-dev svgalib.bin
or with terminal :
$ cd Desktop
$ sudo su
# apt-get install svgalib-bin
....
# apt-get install libsvga1
....
# apt-get install libsvga1-dev
create and open with text editor a text file svga.c on desktop
then copy and paste the program in text file svga.c
modify the program resolution with :
vga_setmode(G1024x768x256); // or your vga desktop screen mode
and save the file.
if you have not already opened, open Terminal and switch as superuser :
$ cd Desktop
$ sudo su
# ls
... ... svga.c ... ...
compile with :
# gcc svga.c -lvga
running with :
# ./a.out
It appears a very small red dot in the upper left for 5 seconds.
Example of yellow circle with math functions
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <vga.h>
int main(void)
{
int x,y,color = 14;
float a;
unsigned int seconds = 5;
/* detect the chipset and give up supervisor rights */
if (vga_init() < 0)
return EXIT_FAILURE;
vga_setmode(G1024x768x256); /* some low resolution dont work */
vga_setcolor(color); /* color of pixel */
for (a=0; a<6.28; a+=0.02)
{ x=(int)(512+100*cos(a));
y=(int)(348-100*sin(a));
vga_drawpixel(x, y); /* draw pixel */
}
sleep(seconds);
/* restore textmode and fall back to ordinary text console handling */
vga_setmode(TEXT);
return EXIT_SUCCESS;
}
dont forget to compile with math library :
$ gcc svga.c -lvga -lm