DescentBB

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#define LIMIT_HOMERS	1
#define HOMER_MAX_FPS	30
#define HOMER_MIN_DELAY (1000 / HOMER_MAX_FPS)

//--------------------------------------------------------------------
//	Set object *objp's orientation to (or towards if I'm ambitious) its velocity.
void homing_missile_turn_towards_velocity(object *objp, vms_vector *norm_vel)
{
	vms_vector	new_fvec;

#ifdef LIMIT_HOMERS
	static time_t   last_time = -1;
	static int nFrames = 1;
	time_t this_time, delta_time;
	fix frame_time;
	int fps;
	if (last_time == -1) {
		last_time = clock ();
		frame_time = FrameTime;
	} else {
		nFrames++;
		this_time = clock ();
		delta_time = this_time - last_time;
		if (delta_time < HOMER_MIN_DELAY) {
			return;
		} else {
			fps = (1000 + delta_time / 2) / delta_time;
			frame_time = fps ? (f1_0 + fps / 2) / fps : f1_0;
			//                     frame_time /= nFrames;
			nFrames = 0;
			last_time = this_time;
		}
	}
#else
	fix frame_time = FrameTime;
#endif