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이것은 사격형 그리고.....
하지만 실행해보면 fail 난다. 원인은 아직 찾고 있는 중이다.

http://blog.naver.com/PostView.nhn?blogId=buniel1&logNo=60065575973&categoryNo=1&parentCategoryNo=1&viewDate=&currentPage=1&postListTopCurrentPage=&isAfterWrite=true&userTopListOpen=true&userTopListCount=20&userTopListManageOpen=false&userTopListCurrentPage=1

#include <stdio.h>

#include <stdlib.h> /* for exit */

#include <unistd.h> /* for open/close .. */

#include <fcntl.h> /* for O_RDWR */

#include <sys/ioctl.h> /* for ioctl */

#include <sys/mman.h> /* for mmap */

#include <linux/fb.h> /* for fb_var_screeninfo, FBIOGET_VSCREENINFO */

#define FBDEVFILE "/dev/fb0"  /* 자신의 모드에 맞게*/

typedef unsigned char ubyte;

void setbox(struct fb_var_screeninfo *fbvar, unsigned char *pfbdata, int color ,

int x, int y, int big);

void setpixel(struct fb_var_screeninfo* , unsigned char *pfbdata, int color, int x, int y);

unsigned char makepixel(ubyte r, ubyte g, ubyte b);

int main()

{

int fbfd = 0;

int ret = 0;

struct fb_var_screeninfo fbvar;

unsigned char *pfbdata;

long int screensize = 0;

fbfd = open(FBDEVFILE, O_RDWR);

if(fbfd < 0 )

{

perror("fbdev open");

exit(1);

}

ret = ioctl(fbfd, FBIOGET_VSCREENINFO, &fbvar);

if( ret <0)

{

perror("fbdev ioctl");

exit(1);

}

printf("bits_per_pixel %x\n", fbvar.bits_per_pixel);

/* Figure out the size of the screen in bytes */

screensize = fbvar.xres * fbvar.yres * fbvar.bits_per_pixel / 8;

printf("screensize %x\n", screensize);

pfbdata = (unsigned char *)mmap(0, screensize, PROT_READ|PROT_WRITE, MAP_SHARED,

fbfd, 0);

if((unsigned)pfbdata == (unsigned)-1)

{

perror("fbdev mmap");

exit(1);

}

else

printf("pfbdata %x\n", pfbdata);

setbox(&fbvar, pfbdata, 0,200, 200, 100);

munmap(pfbdata, screensize);

close(fbfd);

exit(0);

return 0;

}

unsigned char makepixel(ubyte r, ubyte g, ubyte b)

{

return (unsigned char)(((r>>3)<<11)|((g>>2)<<5)|(b>>3));

}

void setpixel(struct fb_var_screeninfo *fbvar, unsigned char *pfbdata, int color, int xpos, int ypos)

{

unsigned char *setpixel_fbdata = pfbdata ;

struct fb_var_screeninfo *setpixel_fbvar = fbvar;

int offset;

unsigned char pixel;

offset = ypos*(*setpixel_fbvar).xres+xpos;

pixel = makepixel(0, 255, 0);

*(setpixel_fbdata+offset) = pixel; /* draw pixel */

}

void setbox(struct fb_var_screeninfo *fbvar, unsigned char *pfbdata, int color, int xpos, int ypos, int k)

{

unsigned char *setdot_fbdata = pfbdata;

struct fb_var_screeninfo *setdot_fbvar = fbvar;

int offset;

unsigned char pixel;

int x, y;

for(x = 0; x < k ; x++)

{

for(y = 0; y < k; y++)

{

offset = (ypos+y)*(*setdot_fbvar).xres+(xpos+x);

pixel = makepixel(11,111,217);

*(setdot_fbdata+offset) = pixel; /* draw pixel */

}

}

}