/***************************************************
** Use GLUT to print out a basic string           **
***************************************************/
void PrintString(char *str)        
{                                     
  int len, i;                        
                                   
  len = (int) strlen(str);
  for(i=0; i<len; i++)
        glutStrokeCharacter(GLUT_STROKE_ROMAN, str[i]);
}


/***************************************************
** Draws frame rate in lower-left coner of screen **
***************************************************/
void displayTimer( float fps )
{
	char buf[1024];

	glPushAttrib( GL_ALL_ATTRIB_BITS );
	glDisable(GL_LIGHTING);
	glDisable(GL_DEPTH_TEST);
	/* draw 2D text to the screen */
	glMatrixMode( GL_PROJECTION );
	glPushMatrix();
	glLoadIdentity();
	gluOrtho2D( 0.0, screen_width, 0.0, screen_height );
	glMatrixMode( GL_MODELVIEW );
	glPushMatrix();
	glLoadIdentity();
	glRasterPos2i(0,0);
	glColor3f(1,1,1);

	glPushMatrix();
	glRasterPos2i(0,0);
	glTranslatef(3, 15, 0);
	glScalef( 0.1, 0.1, 0.1 );
	sprintf( buf, "%.2f fps", fps );
	PrintString( buf );
	glPopMatrix();

	glPopMatrix();
	glMatrixMode( GL_PROJECTION );
	glPopMatrix();
	glMatrixMode( GL_MODELVIEW );

	glPopAttrib();
}