void display()
{
	const float numcolors=8;
	const float cRed[]={0.0,1.0,1.0,0.0,0.0,0.0,1.0,1.0};
	const float cGreen[]={0.0,1.0,0.0,0.0,1.0,1.0,0.0,1.0};
	const float cBlue[]={0.0,1.0,0.0,1.0,0.0,1.0,1.0,0.0};


	int i,j,color;


	glClear(GL_COLOR_BUFFER_BIT);  /* clear the screen */


	for (color=0; color < numcolors; color ++) {
		glColor3f(cRed[color],cGreen[color],cBlue[color]);   /* set drawing color to ith color  */
		for (i=0;i<BUFFWIDTH;i++)  
			for (j=0;j<BUFFHEIGHT;j++)
				if (fb[i][j]==color)  /* draw if pixel is current color */					
					glRectf(i*pixwidth, j* pixheight,(i+1)*pixwidth, (j+1)*pixheight);
	}
	glutSwapBuffers();
}