#include <GL/glut.h>

/*
 * Purpose: Returns the elapsed time in seconds since the last call to get_elapsed_time.
 */
float get_elapsed_time() {
	static GLfloat old_time;
	GLfloat new_time, elapsed_time;

	if (old_time == 0) {
		old_time = glutGet(GLUT_ELAPSED_TIME);
	}

	new_time = glutGet(GLUT_ELAPSED_TIME);
	elapsed_time = (new_time - old_time) / 1000.0;
	old_time = new_time;

	return elapsed_time;
}